CA2177295C - Coating line system and method of repairing coating defect - Google Patents
Coating line system and method of repairing coating defect Download PDFInfo
- Publication number
- CA2177295C CA2177295C CA002177295A CA2177295A CA2177295C CA 2177295 C CA2177295 C CA 2177295C CA 002177295 A CA002177295 A CA 002177295A CA 2177295 A CA2177295 A CA 2177295A CA 2177295 C CA2177295 C CA 2177295C
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- coating
- workpiece
- repairing
- line
- main
- Prior art date
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- Expired - Fee Related
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 334
- 239000011248 coating agent Substances 0.000 title claims abstract description 332
- 230000007547 defect Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims description 19
- 238000001035 drying Methods 0.000 claims abstract description 127
- 230000002950 deficient Effects 0.000 claims description 23
- 238000005498 polishing Methods 0.000 claims description 23
- 238000003860 storage Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 11
- 239000003595 mist Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000011247 coating layer Substances 0.000 description 9
- 230000003068 static effect Effects 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 4
- 239000004922 lacquer Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 3
- 206010013786 Dry skin Diseases 0.000 description 2
- 230000009850 completed effect Effects 0.000 description 2
- 210000003298 dental enamel Anatomy 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004848 polyfunctional curative Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 208000036366 Sensation of pressure Diseases 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
- B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
- B05B14/46—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material
- B05B14/468—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material with scrubbing means arranged below the booth floor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
- B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
- B05B16/60—Ventilation arrangements specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/005—Repairing damaged coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
Abstract
A coating line system has a main coating line including at least a main coating booth for coating a work-piece, and a coating repairing line branched from the main coating line downstream of an inspecting section for in-specting the coated workpiece for a coating defect thereof.
The coating repairing line has a coating repairing booth for repairing a coating defect of the workpiece which is caused in the main coating line, and a drying furnace disposed downstream of the coating repairing booth along the coating repairing line, for drying the workpiece which has been re-paired in the coating repairing booth.
The coating repairing line has a coating repairing booth for repairing a coating defect of the workpiece which is caused in the main coating line, and a drying furnace disposed downstream of the coating repairing booth along the coating repairing line, for drying the workpiece which has been re-paired in the coating repairing booth.
Description
COATING LINE SYSTEM AND METHOD OF
REPAIRING COATING DEFECT
FIELD OF THE INVENTION:
The present :invention relates to a coating line system for smoothing repairing a coating defect on a coated workpiece such as any of various coated components of an automobile, and a method of repairing a coating defect in such a coating line system.
DESCRIPTION OF THE PRIOR ART:
When a coating defect is discovered on an automobile bumper in a bumper coating line during an inspection process, it has heretofore been customary to rub the defective coating surface with sandpaper or the like to remove the defective coating layer from the bumper, and then coat the ground bumper surface again in the bumper coating line. The convention repairing process has been disadvantageous because both newly coated and recoated workpieces are present in the coating line, resulting in low overall coating rate. Another problem ', is that since even those portions of bumpers which do not need to be coated again are recoated, the entire repairing process is tedious and time-consuming, and consumes a large amount of coating solution.
In many coating lines, a workpiece is coated in a coating booth and thereafter dried in a drying furnace down-stream of the coating booth. According to Japanese laid-open patent publication No. 5-50006, published March 2, 1993 for example, a setting booth .is located between a coating booth and a drying furnace . After a coated workpiece is dried with air in the setting booth, the coated workpiece is charged into the drying furnace in which it is baked and dried.
As disclosed in Japanese laid-open patent publication No.
5-50006, the coating booth has its interior space divided into a vertical array of compartments or chambers including a dynamic pressure chamber, a static pressure chamber, a coating chamber, and a trapping chamber that are arranged downwardly in the order named. Air is supplied from a supply duct connected to an upper wall of the coating booth into the dynamic pressure chamber, from which the air is introduced at a constant rate into the static pressure chamber through a punched metal sheet lying between the dynamic pressure chamber and the static pressure chamber. The air introduced in to the static pressure chamber is then supplied to the coating chamber through a filter extending between the static pressure chamber and the coating chamber. The air flowing into the coating chamber is free of dust particles because dust particles are filtered out by the filter. While flowing in the coating chamber, the air collects an uncoated mist of coating solution which remains suspended in the coating chamber. The air with the collected mist of coating solution is then introduced into the trapping chamber in which the mist of coating solution is trapped by trapping water flowing in the trapping chamber. ', _."
The coating booth which is compartmented into the various chambers including the trapping chamber that has a circulatory passage for the trapping water is large in size and expensive to manufacture.
Japanese laid-open utility model publication No. 60-188995, published December 14, 1985, discloses a drying furnace. The disclosed drying furnace has a workpiece conveyor extending in the longitudinal direction of a furnace housing for moving a carriage with a workpiece mounted thereon. Hot air supply ducts are disposed one on each side of the workpiece conveyor and positioned respectively in lower side positions in the furnace housing, and a hot air discharge duct is connected to an upper wall of the furnace housing.
Hot air supplied from the hot air supply ducts is applied to dry coated surfaces of the workpiece on the carriage, and is then discharged from the hot air discharge duct.
When the workpiece moving in the furnace housing is brought to an emergency stop due to some trouble or the rate of operation of the conveyor is lowered, more hot air than is necessary is applied to the coated surfaces of the workpiece.
At this time, the workpiece is heated to a temperature higher than a predetermined allowable temperature, and hence tends to be distorted, elongated, or otherwise damaged. Furthermore, it requires a large-scale system for supplying and discharging hot air to set the workpiece to the predetermined temperature within a short period of time.
REPAIRING COATING DEFECT
FIELD OF THE INVENTION:
The present :invention relates to a coating line system for smoothing repairing a coating defect on a coated workpiece such as any of various coated components of an automobile, and a method of repairing a coating defect in such a coating line system.
DESCRIPTION OF THE PRIOR ART:
When a coating defect is discovered on an automobile bumper in a bumper coating line during an inspection process, it has heretofore been customary to rub the defective coating surface with sandpaper or the like to remove the defective coating layer from the bumper, and then coat the ground bumper surface again in the bumper coating line. The convention repairing process has been disadvantageous because both newly coated and recoated workpieces are present in the coating line, resulting in low overall coating rate. Another problem ', is that since even those portions of bumpers which do not need to be coated again are recoated, the entire repairing process is tedious and time-consuming, and consumes a large amount of coating solution.
In many coating lines, a workpiece is coated in a coating booth and thereafter dried in a drying furnace down-stream of the coating booth. According to Japanese laid-open patent publication No. 5-50006, published March 2, 1993 for example, a setting booth .is located between a coating booth and a drying furnace . After a coated workpiece is dried with air in the setting booth, the coated workpiece is charged into the drying furnace in which it is baked and dried.
As disclosed in Japanese laid-open patent publication No.
5-50006, the coating booth has its interior space divided into a vertical array of compartments or chambers including a dynamic pressure chamber, a static pressure chamber, a coating chamber, and a trapping chamber that are arranged downwardly in the order named. Air is supplied from a supply duct connected to an upper wall of the coating booth into the dynamic pressure chamber, from which the air is introduced at a constant rate into the static pressure chamber through a punched metal sheet lying between the dynamic pressure chamber and the static pressure chamber. The air introduced in to the static pressure chamber is then supplied to the coating chamber through a filter extending between the static pressure chamber and the coating chamber. The air flowing into the coating chamber is free of dust particles because dust particles are filtered out by the filter. While flowing in the coating chamber, the air collects an uncoated mist of coating solution which remains suspended in the coating chamber. The air with the collected mist of coating solution is then introduced into the trapping chamber in which the mist of coating solution is trapped by trapping water flowing in the trapping chamber. ', _."
The coating booth which is compartmented into the various chambers including the trapping chamber that has a circulatory passage for the trapping water is large in size and expensive to manufacture.
Japanese laid-open utility model publication No. 60-188995, published December 14, 1985, discloses a drying furnace. The disclosed drying furnace has a workpiece conveyor extending in the longitudinal direction of a furnace housing for moving a carriage with a workpiece mounted thereon. Hot air supply ducts are disposed one on each side of the workpiece conveyor and positioned respectively in lower side positions in the furnace housing, and a hot air discharge duct is connected to an upper wall of the furnace housing.
Hot air supplied from the hot air supply ducts is applied to dry coated surfaces of the workpiece on the carriage, and is then discharged from the hot air discharge duct.
When the workpiece moving in the furnace housing is brought to an emergency stop due to some trouble or the rate of operation of the conveyor is lowered, more hot air than is necessary is applied to the coated surfaces of the workpiece.
At this time, the workpiece is heated to a temperature higher than a predetermined allowable temperature, and hence tends to be distorted, elongated, or otherwise damaged. Furthermore, it requires a large-scale system for supplying and discharging hot air to set the workpiece to the predetermined temperature within a short period of time.
..w"...
There have been demands for a coating line system of relatively simple structure which is capable of easily and efficiently repairing coating defects on coated work-pieces, and a method of repairing a coating defect in such a coating line system.
SUMMARY OF THE INVENTION
It is therefore an object of the present inven-tion to provide a coating line system of relatively simple structure for easily and efficiently repairing coating de-fects of coated workpieces while saving resources and energy required to coat workpieces, and a method of repairing a coating defect of a coated workpiece in such a coating line system.
According t.o the present invention, there is pro-vided a coating line system comprising a main coating line including at least a main coating booth for coating a work-piece, and a coating repairing line branched from the main coating line, the coating repairing line having coating re-pairing means for repairing a coating defect of the work-piece which is caused in the main coating line, and drying means disposed downstream of the coating repairing means along the coating repairing line, for drying the workpiece which has been repaired by the coating repairing means.
The coating repairing means comprises a coating repairing booth for recoating a localized coating defect surface of the workpiece, and the drying means comprises a storage booth for storing a predetermined number of work-..
pieces recoated in the coating repairing booth, and a drying furnace for drying the predetermined number of workpieces delivered from the storage booth. The coating repairing booth has a workpiece feed path for delivering the workpiece therealong, and the coating line system further comprises an air discharge chamber connected to the coating repairing booth laterally of the workpiece feed path, the main coating booth having a trapping chamber communicating with the air discharge chamber. With this arrangement, the workpiece can ', be dried with hot air and the hot air can be discharged with high energy efficiency.
Preferably, the drying furnace has a pair of spaced side walls, and the coating line system further com-prises a hot air supply duct connected to a lower portion of one of the side walls and a hot air discharge duct connected to an upper potion of the other of the side walls. This arrangement allows the temperature to rise in a relatively short period of time within the drying furnace. I
The coating repairing booth comprises an upper wall and a side wall connected thereto, the upper wall hav-ing an opening defined therein, an air inlet duct connected to the opening in the upper wall for introducing air into the coating repairing booth through the opening, an air di-rection adjusting member disposed in the coating repairing booth and connected to the opening, for distributing air into the coating repairing booth, a filter disposed in the coating repairing booth for dividing an interior space thereof into an upper air direction adjusting chamber hous-ing the air direction adjusting member and a lower coating chamber disposed below the upper air direction adjusting L
chamber for recoating a localized coating defect surface of the workpiece, air direction adjusting means disposed on an upper surface of the filter, and an air discharge port de- ', fined in the side wall for discharging air from the lower coating chamber. Preferably, the air direction adjusting means comprises a plurality of air direction adjusting slats disposed on the upper surface of the filter and extending along a workpiece feed path in the lower coating chamber, the air direction adjusting slats being slanted such that ', the air direction adjusting slat remotest from the air dis-charge port is directed substantially vertically and the other air direction adjusting slats are slanted through pro- ', gressively greater angles toward the air discharge port to cause those air direction adjusting slats which are posi-tinned closer to the a_ir discharge port to direct air streams farther away from the air discharge port. Air can flow at an appropriate uniform speed in the coating repair-ing booth.
The main coating line further comprises a first inspecting section for inspecting a coated condition of the workpiece after the workpiece is coated in the main coating booth to determine whether the workpiece is accepted for being delivered to a next step in the main coating line, rejected, or needs to be polished, a polishing section for _ 6 _ ', polishing the workpiece if the workpiece is judged as need-ing to be polished by the first inspecting section, and a second inspecting section for inspecting a polished condi-tion of the workpiece from the polishing section to deter- ', mine whether the workpiece is accepted for being delivered to the next step or rejected. The coating repairing means comprises a spot coating section for recoating a coating defect spot on the workpiece if the workpiece is judged as I
being rejected by the second inspecting section. The main ', coating line includes a main line drying furnace for drying the workpiece, and the drying means comprises a spot drying furnace communicating with the main line drying furnace for drying the workpiece with heat supplied from the main line drying furnace. I
According to the present invention, there is fur-ther provided a method of repairing a coating defect of a workpiece, comprising the steps of coating a workpiece in a main coating line, delivering the workpiece from the main coating line to a coating repairing line branched from the main coating line if the workpiece coated in the main coat-ing line has a coating defect, and repairing the coating defect of the workpiece in the coating repairing line. The ', step of repairing the coating defect comprises the step of recoating the coating detect in a spot on the workpiece.
The above and further objects, details and ad-vantages of the present invention will become apparent from ', the following detailed description of preferred embodiments thereof, when read in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of a coating line sys-tem including a main caating line and a coating repairing line, according to a first embodiment of the present inven-tion;
FIG. 2 is a vertical cross-sectional view of a coating repairing booth in the coating repairing line and a coating booth in the main coating line;
FIG. 3 is a bottom view taken along line III -III of FIG. 2;
FIG. 4 is a bottom view taken along line IV - IV
of FIG. 2;
FIG. 5 is a cross-sectional view taken along line V - V of FIG. 2;
FIG. 6 is a transverse cross-sectional view of a drying furnace in the coating repairing line, the view being taken across a workpiece conveyor in the drying furnace;
FIG. 7 is a cross-sectional view taken along line VII - VII of FIG. 6;
FIG. 8 is a cross-sectional view taken along line VIII - VIII of FIG. 6;
FIG. 9 is a graph of temperatures at different points in the drying furnace as they increase with time;
~~ i"~~
FIG. 10 is a flowchart of a bumper repairing process in a coating line system according to a second em-bodiment of the present: invention; ', FIG. 11 is a schematic view showing the relation- ', ship between a spot drying furnace and a main line drying furnace in the coating line system according to the second embodiment; and FIG. 12 is a flowchart of an operation sequence of a conventional bumper repairing process.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows in block form a coating line system including a main coating line and a coating repairing line, according to a first embodiment of the present invention.
The coating line system shown in FIG. 1 is typically incor-porated in a coating line for coating automobile bumpers, for example. The coating repairing line is capable of effi-ciently repairing coating defects on automobile bumpers which have been discovered in the main coating line.
As shown in FIG. 1, a main coating line 1 has a ', main coating booth 2 for coating a bumper W (see FIG. 2).
The bumper W which is coated in the main coating booth 2 is ' supplied to a drying furnace (not shown) in which it is baked and dried. Thereafter, the coated bumper W is in-spected for its coated condition by an inspecting section 3 (inspecting step). If the coated bumper W is free of coat-ing defects, then the <:oating bumper W is discharged as a ', completed product leftward from the inspecting section 3. ' If the coated bumper W suffers a coating defect, then the coated bumper W is transferred rightward to a coating re-pairing line 4 connected to the inspecting section 3.
The coating repairing line 4 is branched from the main coating line 1 at the inspecting section 3, and has a grinding section 5, a coating repairing booth 6, a storage booth 7, and a drying furnace 8 which are arranged in the order named downstream along the coating repairing line 4.
After the coating layer in a coating defect area of a bumper W is removed from the bumper W in the grinding section 5, the ground area of the bumper W is recoated in the coating repairing booth 6. When the number of repaired bumpers W ', stored in the storage booth 7 reaches a predetermined num- ', ber, the repaired bumpers W are delivered into the drying furnace 8 in which the coating layers of the repaired bump- ', ers V~ are dried .
As shown in FIGS. 2 through 5, the coating re-pairing booth 6 has an upper wall 6a having an opening de-fined therein to wh~_ch a plurality of (two in the illus-trated embodiment, see FIG. 5) air inlet ducts 10 are con-nected for introducing air into the coating repairing booth 6 through the opening. An air discharge chamber 110 is con-nected to a vertical_ side wall 6b of the coating repairing booth 6 laterally of a workpiece feed path in the coating repairing booth 6. An air discharge duct 12 is connected to an upper end of the air discharge chamber 110. The coating repairing booth 6 has its interior space divided into an upper air direction adjusting chamber 13 and a lower coating chamber 14 by a horizontal filter 15. The air inlet ducts have respective open ends 10a opening into the upper air direction adjusting chamber 13 and each connected to a plu-s rality of (two in the illustrated embodiment, see FIG. 2) funnel-shaped air direction adjusting members 16, 17 which are disposed in the upper air direction adjusting chamber 13. As shown in FIG. 4, a punched metal sheet 18 is at-tacked to a lower surface of the air direction adjusting 10 member 17 which is positioned below the air direction ad-justing member 16. The funnel-shaped air direction adjust-ing members 16, 17 serve to distribute or diffuse air sup-plied from the air inlet ducts 10 uniformly into the coating repairing bocth 6. The side wall 6b of the coating repair-ing booth 6 has an air discharge port 20 defined therein through which the coating chamber 14 and the air discharge chamber 110communicate with each other.
A plurality of air direction adjusting slats 19 are disposed on an upper surface of the filter 15. The air direction adjusting slats 19 extend along the workpiece feed path in the longitudinal direction of the coating repairing booth 6, i.e., in the direction normal to the sheet of FIG.
2. The air direction adjusting slats 19 are slanted such that the air direction adjusting slat 19 remotest from the air discharge chamber 1I0 is directed substantially verti-cally and the other air direction adjusting slats 19 have their upper ends inclined through progressively greater an-'' gles toward the air discharge chamber110. Specifically, the air direction adjusting slats 19 extend parallel to the workpiece feed path in the coating repairing booth 6. The air direction adjusting slat 19 remotest from the air dis-charge port 20 is directed substantially vertically, and the upper ends of the other air direction adjusting slats 19 are slanted through progressively greater angles toward the air discharge port 20 to cause those air direction adjusting slats 19 which are positioned closer to the air discharge port 20 to direct air streams farther away from the air dis-charge port 20.
The air discharge duct 12 is connected through an air discharge fan 21 to a trapping chamber 29 defined in the main coating booth 2. The main coating booth 2 has an upper wall 2a to ~ehich an air supply duct 22 is connected. The main coating booth 2 houses therein a punched metal sheet 23, a filter 24, and a drainboard 25 which are arranged at spaced intervals in the order named in the downward direc-tion. The punched metal sheet 23, the filter 24, and the drainboard 25 divide the interior space of the main coating booth 2 into a dynamic pressure chamber 26, a static pres-sure chamber 27, a coating chamber 28, and the trapping chamber 29 that are arranged downwardly in the order named.
The trapping chamber 29 has a pair of laterally spaced trapping water reservoirs 31 extending longitudinally along opposite side walls thereof, and a pair of water guide panels 32a, 32b extending from the trapping water reservoirs 31 obliquely downwardly toward each other. The water guide panels 32a, 32b have inner distal ends vertically superposed with a gap defined as a water passage 33 therebetween sub-stantially centrally in the trapping chamber 29. The main ', coating booth 2 has a lower wall inclined transversely which includes a water drain bit 34 defined in the lower end of the lower wall near one vertical side wall of the main coat-ing booth 2. The main coating booth 2 has an opposite ver-tical side wall to which there is connected an air discharge duct 35 connected to an air discharge fan 36. A vertical baffle plate 37 is connected to and extends downwardly from the water guide panel 32a, and a vertical baffle plate 37 is ', connected to and extends downwardly from the water guide panel 32b. Another vertical baffle plate 37 is connected to ', and extends upwardly from the lower wall of the main coating booth 2 adjacent to the vertical baffle plate 37 connected to the water guide panel 32b. ' The coating repairing booth 6 is much simpler in ' structure than the main coating booth 2. However, the coat-ing repairing booth 6 provides good coating conditions.
Specifically, when air was supplied from the air inlet ducts 10 into the coating repairing booth 6 at a rate of 140 m3/min. and discharged from the coating repairing booth 6 by the air discharge fan 21 at a rate of 140 m3/min., the air flew at points "a" - "j" (see FIG. 2) in the coating repair-ing booth 6 at respective speeds of 0.40 m/sec. at the point "a", 0.45 m/sec. at the point "b", 0.45 m/sec. at the point "c", 0.40 m/sec. at the point "d", 0.40 m/sec. at the point "e", 0.40 m/sec. at the point "f", 0.40 m/sec. at the point "g", 0.40 m/sec. at the point "h", 0.40 m/sec. at the point "i", and 0.40 m/sec. at the point "j" as measured by an ane-mometer Model 6151, and it was found that the air speeds were appropriate s_n the range from 0.40 m/sec. to 0.45 m/sec.
The bumper W is placed on a repairing carriage 38 which can travel along the workpiece feed path in the coat-ing repairing booth 6, and is coated by a coating gun 40. A
mist of coating solution suspended in the coating repairing booth 6 is collected by the air flowing in the coating re-pairing booth 6, and delivered into the air discharge dram-ber 119 from which the coating solution mist is discharged into the trapping chamber 29 in the main coating booth 2 by the air discharge fan 21. Therefore, no trapping chamber is needed in the coating repairing booth 6, which may thus be relatively simple in structure and small in size.
The drying furnace 8 will be described below with reference to FIGS.. 6 through 8. As shown in FIG. 6, the drying furnace 8 comprises a batch drying furnace for drying a batch of coated bumpers W carried on a drying carriage 41 which travels alOIlg a carriage path in the drying furnace 8.
As shown in FIGS. 7 and 8, the drying furnace 8 has a pair of double-leafed hinged doors 42 at inlet and outlet open-ings thereof through which the drying carriage 41 can move into and out of the drying furnace 8. As shown in FIG. 6, ;,, the drying furnace 8 has a hot air supply port 43 defined in a lower portion of a vertical side wall 8a thereof which extends along the carriage path, the hot air support port 43 ', being connected to a hot air supply duct 44. The drying furnace 8 has a plurality of longitudinally spaced hot air discharge ports 45 defined in an upper portion of an oppo-site vertical side wall 8b thereof and connected to respec-tive hot air discharge ducts 46 that are joined to an outer surface of the vertical side wall 8b.
The drying carriage 41 comprises a vertical side frame 47, a pair of front and rear sets of three vertically spaced horizontal support bars 48 extending laterally from ', the vertical side frame 47, and three workpiece support rods 49 supported vertically on each of the horizontal support bars 48. Each of the bumpers W is supported by a pair of front and rear workpiece support rods 49. Therefore, a to-tal of nine bumpers W can be carried by one drying carriage 41. The drying furnace 8 can accommodate three drying car-riages 41 at a time.
For drying coated surfaces of the bumpers w within a short period of time in the drying furnace 8, it is preferable to quickly achieve a desired temperature in the ', drying furnace 8 after hot air has started to be supplied into the drying furnace 8 and thereafter keep the desired temperature stably in the drying furnace 8.
A test was conducted by placing three drying car-riages 41 in the drying furnace 8, closing the double-leafed ', hinged doors 42, supplying hot air at 85°C from the hot air supply port 43 into the drying furnace 8, and observing tem-peratures in the drying furnace 8. The temperatures meas-ured at respective points "a" - "f" (see FIG. 6) in the dry-ing furnace 8, as they varied with time, are plotted in FIG.
9. A study of FIG. 9 indicates that the temperatures meas-ured at the points "a" and "b" in the drying furnace 8 reached 85°C in about 25 minutes and were constant subse-quently, and the temperatures measured at the points "c" -- ' "f" on surfaces of bumpers W reached 80°C in about 25 min-utes and were constant subsequently.
It can be seen from FIG. 9 that the temperatures ', in the drying furnace 8 can rise quickly and can subse-quently be kept at constant levels. When bumpers W carried on the three drying carriages 41 were dried in the drying furnace 8, the coated surfaces of the bumpers W were uni-formly dried in about 55 minutes after they began to be dried. Therefore, items or parameters to be controlled in the drying furnace 8 may be only the temperature of the hot air and the time for which the hot air is supplied. The drying furnace 8 itself is quite simple in structure.
when a bumper W coated in the coating repairing booth 6 is delivered into the storage booth 7 by the repair-ing carriage 38, the bumper W is transferred onto the drying carriage 41 and stored in the storage booth 7. When the number of stored bumpers W in the storage booth 7 reaches a predetermined number, the bumpers W are then delivered into ,,>,..~r~
the drying furnace 8 by the drying carriage 41. In this manner, the bumpers W c:an be dried with high energy effi-ciency in the drying furnace 8.
Any bumper W which has been coated in the main coating booth 2 in the main coating line 1 is inspected in the inspecting section 3. If the coating layer of the bumper W is found normal, then it is discharged as a com-pleted product leftward from the inspecting section 3. If the coated bumper W suffers a coating defect, then it is transferred rightward to the coating repairing line 4 in which the coating layer_ around the coating defect of the bumper W is removed in the grinding section 5 and then the bumper W is delivered into the coating repairing booth 6 in which it is locally recoated.
Though no dynamic and static pressure chambers are defined in the coating repairing booth 6, air flows at appropriate rates and speeds in the coating chamber 14, al-lowing the bumper W to be coated under stable conditions.
Since a collected mist of coating solution is discharged into the trapping chamber 29 in the main coating booth 6, no dedicated trapping chamber is required in the coating re-pairing booth 6, and hence the coating repairing booth 6 may be small in size and simple in structure.
A bumper W whose defective coating layer has been repaired is placed on the repairing carriage 38 and carried into the storage booth 7 where the bumper W is transferred onto a drying carriage 41. The bumper W remains stored in ... ~r__._...~.._.~_...~~R.~.n~.~.,~.. , w.~~~
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the storage booth 7 until a predetermined number of bumpers ', W are accumulated in the storage booth 7. When the number of stored bumpers W in the storage booth 7 reaches a prede-termined number, the bumpers W are delivered altogether to he drying furnace 8. The drying furnace 8 is then supplied with hot air for a certain period of time, after which the bumpers W are unloaded from the drying furnace 8. In this manner, bumpers W with defective coating layers can effi-ciently be repaired in the dedicated coating repairing line 4.
As described above, when a workpiece with a coat-ing defect is discovered in the inspecting step of the main coating line of the coating line system according to the first embodiment, the workpiece is delivered into the coat-ing repairing booth of the coating repairing line, locally recoated in the coating repairing booth, and then delivered to the drying furnace in which the workpiece is dried.
Therefore, workpieces with normal and defective coating lay-ers are not simultaneously present in the main coating booth of the main coating line, and any workpieces with coating defects can efficiently be repaired smoothly.
The air discharge chamber is connected to one of the vertical side walls of the coating repairing booth lat-erally of the workpiece feed path in the coating repairing booth, and is held in communication with the trapping cham ber in the main coating booth of the main coating line.
Since the trapping chamber in the main coating booth is shared by the main coating booth and the coating repairing ', booth, the coating repairing booth requires no dedicated ', trapping chamber therein and hence is relatively simple in structure.
The hot air supply duct is connected to the lower portion of one of the side walls of the drying furnace, and the hot air discharge ducts are connected to the upper por-tion of the other side wall of the drying furnace. With this arrangement, the temperature in the drying furnace can ', be increased in a relatively short period of time, and sub-sequently maintained at a constant temperature. The drying ', furnace is also relatively simple in structure.
The coating repairing booth has the air direction adjusting members connected to the respective open ends of the air inlet ducts joined to the upper wall of the coating repairing booth. The interior space of the coating repair-ing booth is divided into the upper air direction adjusting chamber and the lower coating chamber by the horizontal fil-ter. The air direction adjusting slats are attached to the ', upper surface of the filter, and the air discharge duct is connected to one side wall of the lower coating chamber.
With this arrangement, the speed of air flowing in the lower coating chamber can be kept at a constant level though no dynamic and static pressure chambers are defined in the coating repairing booth. The coating repairing booth is thus relatively simple in structure. ', ~~._~....~~.._~..~.,m.x .-~ ------...~,.~.. n ..pe.._~
A coating line system for repairing a coating defect of a bumper which is caused in a main coating line, according to a second embodiment of the present invention will be described below. According to the second embodi-ment, the main coating line differs from the main coating line according to the first embodiment. ', FIG. 12 shows an operation sequence of a conven-tional bumper repairing process. As shown in FIG. 12, a bumper is coated in a coating section S100 (coating step) of a main coating line 11, and then inspected in an inspecting section S101 (inspecting step). If the inspected bumper needs to be polished, then it is polished in a polishing section S102 (polishing step), and thereafter inspected in an inspecting section 5103 (inspecting step). If the in-spected bumper is rejecaed in the inspecting section S101, then it is sent to a sandpaper rubbing section S104 (sandpaper rubbing step) in which the bumper is sandpapered in its entirety, but not just a defective coating layer thereof. Thereafter, the bumper is recoated in its entirety in the coating section S100 of the main coating line. ', With the conventional bumper repairing process shown in FIG. 12, since even those portions of bumpers which do not need to be coated again are recoated, the entire re-pairing process is tedious and time-consuming, and consumes a large amount of coating solution. Moreover, inasmuch as bumpers with defecting coatings are repaired in the coating _ 2p _ section S100 of the main~ coating line 11, the productivity of the coating process is comparatively low.
The coating line system according to the second embodiment has been devised in an attempt to eliminate the above drawbacks of the conventional bumper repairing proc-ess. The coating line system according to the second em-bodiment is relatively simple in structure and capable of easily and efficiently repairing coating defects on coated bumpers while saving resources and energy.
A bumper repairing process of the coating line system according to the second embodiment is illustrated in FIG. 10.
As shown in FIG. 10, a bumper W is coated in a coating section S1 (coating step) of a main coating line 11.
Specifically, in the coating section S1, the bumper w is treated with a chlorine solvent, coated with a primer, I
coated with a top coat of enamel and clear lacquer, and dried with circulating hot air. After the bumper W is coated, its coating layer is inspected in an inspecting sec-tion S2 (inspecting step). If the bumper W is accepted, then it is delivered to a next section S3 (next step) of the main coating line 11. If the bumper W needs to be polished, then it is sent to a polishing section S4 (polishing steps S4a; S4b, S4c) where it is polished. If the bumper W is rejected, i.e., if the bumper W has a large defective coat-ing area greater than a postcard and cannot be repaired in a spot thereon, then it is delivered to a sandpaper rubbing section S5 (sandpaper rubbing step) in which the bumper is sandpapered. Thereafter, the bumper w is recoated in the coating section S1 (coating step) of the main coating line 11.
In the polishing section S4, the bumper W is ground with sandpaper <~nd polished with a very fine compound in the step S4a, glossed with a compound in the step S4b, and treated with a wax to remove white blurs from the bumper W in the step S4c. ', After the bumper W is polished in the polishing section S4, it is inspected in a second inspecting section S6 (inspecting step). If the bumper W is accepted, it is delivered to the next section S3 (next step) of the main coating line 11. If the bumper W is rejected, then it is coated in a spot thereon in a spot coating section S7 (spot ', coating steps S7a -- S7e) and dried in a drying section S8 (drying step).
In the spot coating section S7, the bumper W is successively corrected in its polished condition with sand-paper in the step S7a, cleaned with a white damp in the step S7b, roughened with uniwool, sandpaper, or a compound in the step S7c, coated with a top coat of enamel and clear lacquer in the step S7d, and blurred with a blurring solution in the step S7e. Thereafter, the bumper W is dried with circulat-ing hot air in a drying section S8.
In the roughening step S7c, the bumper W is roughened with a selected one of uniwool, sandpaper, and a compound. In the top coating step S7d, the bumper W is coated using the same coating solution, composed of a paint, ', a hardener, and a thinner, as the coating solution used in the coating section S1 of the main coating line 11. The blurring solution used in the blurring step S7e comprises 2 o by weight of a hardener, 8 % by weight of a clear lacquer, - 45 % by weight of a thinner, and 45 % -- 80 % by weight of a retarder. The thinner may be a thinner for Soflex clear lacquer, for example, manufactured by Kansai Paint 10 Co., Ltd. and the retarder may be a Hiart # 3000 retarder, ', for example, manufactured by Isamu Paint Co., Ltd. If the amount of the retarder were less than 45 o by weight, then the bumper surface would become less smooth and suffer blur-ring marks, requiring the bumper W to be processed in longer time and with greater efforts in the step S4a. If the amount of the retarder were more than 80 o by weight, then the blurring solution would not adhere closely to the top coat on the bumper W.
As shown in FIG. 11, the drying section S8 has a ', spot drying furnace 51 for drying bumpers W with circulating hot air at 80°C for 30 minutes which is supplied from a main line drying furnace 50 which is disposed in the coating sec-tion S1 of the main coating line 11. The spot drying fur-nace 51 is connected to the main line drying furnace 50 through a circulating duct 52 having an air fan 53 disposed near an inlet port of the spot drying furnace 51. The spot drying furnace 51 is controlled through a control console 54.
The bumpers W which are carried on a carriage 55 are dried with circulating hot air at 80°C for 30 minutes in the main line drying furnace 50 while the bumpers W are be-ing fed in the main line drying furnace 50 by the carriage 55. If no hot air needs to be introduced from the main line drying furnace 50 into the spot drying furnace 51, then the air fan 53 is not actuated, and the hot air circulates only ', in the main line drying furnace 50.
For drying a predetermined number of bumpers W
coated in the spot coating section S7 with the spot drying furnace 51, the bumpers W are carried on the carriage 57 and delivered into the spot drying furnace 51, and the air fan 53 is actuated to introduce hot air from the main line dry-ing furnace 50 into the spot drying furnace 51 through the circulating duct 52. At the same time, the hot air is cir-culated between the main line drying furnace 50 and the spot drying furnace 51 in order to be kept at 80°C at all times.
In this manner, the bumpers W can be dried also in the spot drying furnace 51 with circulating air at 80°C for 30 min-utes.
Each of the dried bumpers W is polished again in the polishing section S4 (polishing steps S4a, S4b, S4c).
After the bumper W is polished in the polishing section S4, it is inspected again in the inspecting section S6. If the inspected bumper W is accepted, then it is delivered to the ~v~~rz~~
next section S3 of the main coating line 11. If the in-spected bumper W is rejected, it is recoated in a spot thereon in the spot coating section S7 and then dried in the drying section S8.
The coating line system according to the second embodiment is effective to reduce the amount of a coating solution which is consumed and hence to save resources re-quired to coat bumpers W. Since polished bumpers W which are rejected can be repaired without using the coating sec-tion S1 of the main coating line, the productivity of the main coating line can be increased. Furthermore, polished bumpers W are dried with heat supplied from the main line drying furnace, the running cost of the coating line system is relatively low, and the coating line system is effective to save energy required to coat bumpers W.
Although certain preferred embodiments of the present invention have been shown and described in detail, it should be understood that various changes and modifica tions may be made therein without departing from the scope of the appended claims.
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There have been demands for a coating line system of relatively simple structure which is capable of easily and efficiently repairing coating defects on coated work-pieces, and a method of repairing a coating defect in such a coating line system.
SUMMARY OF THE INVENTION
It is therefore an object of the present inven-tion to provide a coating line system of relatively simple structure for easily and efficiently repairing coating de-fects of coated workpieces while saving resources and energy required to coat workpieces, and a method of repairing a coating defect of a coated workpiece in such a coating line system.
According t.o the present invention, there is pro-vided a coating line system comprising a main coating line including at least a main coating booth for coating a work-piece, and a coating repairing line branched from the main coating line, the coating repairing line having coating re-pairing means for repairing a coating defect of the work-piece which is caused in the main coating line, and drying means disposed downstream of the coating repairing means along the coating repairing line, for drying the workpiece which has been repaired by the coating repairing means.
The coating repairing means comprises a coating repairing booth for recoating a localized coating defect surface of the workpiece, and the drying means comprises a storage booth for storing a predetermined number of work-..
pieces recoated in the coating repairing booth, and a drying furnace for drying the predetermined number of workpieces delivered from the storage booth. The coating repairing booth has a workpiece feed path for delivering the workpiece therealong, and the coating line system further comprises an air discharge chamber connected to the coating repairing booth laterally of the workpiece feed path, the main coating booth having a trapping chamber communicating with the air discharge chamber. With this arrangement, the workpiece can ', be dried with hot air and the hot air can be discharged with high energy efficiency.
Preferably, the drying furnace has a pair of spaced side walls, and the coating line system further com-prises a hot air supply duct connected to a lower portion of one of the side walls and a hot air discharge duct connected to an upper potion of the other of the side walls. This arrangement allows the temperature to rise in a relatively short period of time within the drying furnace. I
The coating repairing booth comprises an upper wall and a side wall connected thereto, the upper wall hav-ing an opening defined therein, an air inlet duct connected to the opening in the upper wall for introducing air into the coating repairing booth through the opening, an air di-rection adjusting member disposed in the coating repairing booth and connected to the opening, for distributing air into the coating repairing booth, a filter disposed in the coating repairing booth for dividing an interior space thereof into an upper air direction adjusting chamber hous-ing the air direction adjusting member and a lower coating chamber disposed below the upper air direction adjusting L
chamber for recoating a localized coating defect surface of the workpiece, air direction adjusting means disposed on an upper surface of the filter, and an air discharge port de- ', fined in the side wall for discharging air from the lower coating chamber. Preferably, the air direction adjusting means comprises a plurality of air direction adjusting slats disposed on the upper surface of the filter and extending along a workpiece feed path in the lower coating chamber, the air direction adjusting slats being slanted such that ', the air direction adjusting slat remotest from the air dis-charge port is directed substantially vertically and the other air direction adjusting slats are slanted through pro- ', gressively greater angles toward the air discharge port to cause those air direction adjusting slats which are posi-tinned closer to the a_ir discharge port to direct air streams farther away from the air discharge port. Air can flow at an appropriate uniform speed in the coating repair-ing booth.
The main coating line further comprises a first inspecting section for inspecting a coated condition of the workpiece after the workpiece is coated in the main coating booth to determine whether the workpiece is accepted for being delivered to a next step in the main coating line, rejected, or needs to be polished, a polishing section for _ 6 _ ', polishing the workpiece if the workpiece is judged as need-ing to be polished by the first inspecting section, and a second inspecting section for inspecting a polished condi-tion of the workpiece from the polishing section to deter- ', mine whether the workpiece is accepted for being delivered to the next step or rejected. The coating repairing means comprises a spot coating section for recoating a coating defect spot on the workpiece if the workpiece is judged as I
being rejected by the second inspecting section. The main ', coating line includes a main line drying furnace for drying the workpiece, and the drying means comprises a spot drying furnace communicating with the main line drying furnace for drying the workpiece with heat supplied from the main line drying furnace. I
According to the present invention, there is fur-ther provided a method of repairing a coating defect of a workpiece, comprising the steps of coating a workpiece in a main coating line, delivering the workpiece from the main coating line to a coating repairing line branched from the main coating line if the workpiece coated in the main coat-ing line has a coating defect, and repairing the coating defect of the workpiece in the coating repairing line. The ', step of repairing the coating defect comprises the step of recoating the coating detect in a spot on the workpiece.
The above and further objects, details and ad-vantages of the present invention will become apparent from ', the following detailed description of preferred embodiments thereof, when read in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of a coating line sys-tem including a main caating line and a coating repairing line, according to a first embodiment of the present inven-tion;
FIG. 2 is a vertical cross-sectional view of a coating repairing booth in the coating repairing line and a coating booth in the main coating line;
FIG. 3 is a bottom view taken along line III -III of FIG. 2;
FIG. 4 is a bottom view taken along line IV - IV
of FIG. 2;
FIG. 5 is a cross-sectional view taken along line V - V of FIG. 2;
FIG. 6 is a transverse cross-sectional view of a drying furnace in the coating repairing line, the view being taken across a workpiece conveyor in the drying furnace;
FIG. 7 is a cross-sectional view taken along line VII - VII of FIG. 6;
FIG. 8 is a cross-sectional view taken along line VIII - VIII of FIG. 6;
FIG. 9 is a graph of temperatures at different points in the drying furnace as they increase with time;
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FIG. 10 is a flowchart of a bumper repairing process in a coating line system according to a second em-bodiment of the present: invention; ', FIG. 11 is a schematic view showing the relation- ', ship between a spot drying furnace and a main line drying furnace in the coating line system according to the second embodiment; and FIG. 12 is a flowchart of an operation sequence of a conventional bumper repairing process.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows in block form a coating line system including a main coating line and a coating repairing line, according to a first embodiment of the present invention.
The coating line system shown in FIG. 1 is typically incor-porated in a coating line for coating automobile bumpers, for example. The coating repairing line is capable of effi-ciently repairing coating defects on automobile bumpers which have been discovered in the main coating line.
As shown in FIG. 1, a main coating line 1 has a ', main coating booth 2 for coating a bumper W (see FIG. 2).
The bumper W which is coated in the main coating booth 2 is ' supplied to a drying furnace (not shown) in which it is baked and dried. Thereafter, the coated bumper W is in-spected for its coated condition by an inspecting section 3 (inspecting step). If the coated bumper W is free of coat-ing defects, then the <:oating bumper W is discharged as a ', completed product leftward from the inspecting section 3. ' If the coated bumper W suffers a coating defect, then the coated bumper W is transferred rightward to a coating re-pairing line 4 connected to the inspecting section 3.
The coating repairing line 4 is branched from the main coating line 1 at the inspecting section 3, and has a grinding section 5, a coating repairing booth 6, a storage booth 7, and a drying furnace 8 which are arranged in the order named downstream along the coating repairing line 4.
After the coating layer in a coating defect area of a bumper W is removed from the bumper W in the grinding section 5, the ground area of the bumper W is recoated in the coating repairing booth 6. When the number of repaired bumpers W ', stored in the storage booth 7 reaches a predetermined num- ', ber, the repaired bumpers W are delivered into the drying furnace 8 in which the coating layers of the repaired bump- ', ers V~ are dried .
As shown in FIGS. 2 through 5, the coating re-pairing booth 6 has an upper wall 6a having an opening de-fined therein to wh~_ch a plurality of (two in the illus-trated embodiment, see FIG. 5) air inlet ducts 10 are con-nected for introducing air into the coating repairing booth 6 through the opening. An air discharge chamber 110 is con-nected to a vertical_ side wall 6b of the coating repairing booth 6 laterally of a workpiece feed path in the coating repairing booth 6. An air discharge duct 12 is connected to an upper end of the air discharge chamber 110. The coating repairing booth 6 has its interior space divided into an upper air direction adjusting chamber 13 and a lower coating chamber 14 by a horizontal filter 15. The air inlet ducts have respective open ends 10a opening into the upper air direction adjusting chamber 13 and each connected to a plu-s rality of (two in the illustrated embodiment, see FIG. 2) funnel-shaped air direction adjusting members 16, 17 which are disposed in the upper air direction adjusting chamber 13. As shown in FIG. 4, a punched metal sheet 18 is at-tacked to a lower surface of the air direction adjusting 10 member 17 which is positioned below the air direction ad-justing member 16. The funnel-shaped air direction adjust-ing members 16, 17 serve to distribute or diffuse air sup-plied from the air inlet ducts 10 uniformly into the coating repairing bocth 6. The side wall 6b of the coating repair-ing booth 6 has an air discharge port 20 defined therein through which the coating chamber 14 and the air discharge chamber 110communicate with each other.
A plurality of air direction adjusting slats 19 are disposed on an upper surface of the filter 15. The air direction adjusting slats 19 extend along the workpiece feed path in the longitudinal direction of the coating repairing booth 6, i.e., in the direction normal to the sheet of FIG.
2. The air direction adjusting slats 19 are slanted such that the air direction adjusting slat 19 remotest from the air discharge chamber 1I0 is directed substantially verti-cally and the other air direction adjusting slats 19 have their upper ends inclined through progressively greater an-'' gles toward the air discharge chamber110. Specifically, the air direction adjusting slats 19 extend parallel to the workpiece feed path in the coating repairing booth 6. The air direction adjusting slat 19 remotest from the air dis-charge port 20 is directed substantially vertically, and the upper ends of the other air direction adjusting slats 19 are slanted through progressively greater angles toward the air discharge port 20 to cause those air direction adjusting slats 19 which are positioned closer to the air discharge port 20 to direct air streams farther away from the air dis-charge port 20.
The air discharge duct 12 is connected through an air discharge fan 21 to a trapping chamber 29 defined in the main coating booth 2. The main coating booth 2 has an upper wall 2a to ~ehich an air supply duct 22 is connected. The main coating booth 2 houses therein a punched metal sheet 23, a filter 24, and a drainboard 25 which are arranged at spaced intervals in the order named in the downward direc-tion. The punched metal sheet 23, the filter 24, and the drainboard 25 divide the interior space of the main coating booth 2 into a dynamic pressure chamber 26, a static pres-sure chamber 27, a coating chamber 28, and the trapping chamber 29 that are arranged downwardly in the order named.
The trapping chamber 29 has a pair of laterally spaced trapping water reservoirs 31 extending longitudinally along opposite side walls thereof, and a pair of water guide panels 32a, 32b extending from the trapping water reservoirs 31 obliquely downwardly toward each other. The water guide panels 32a, 32b have inner distal ends vertically superposed with a gap defined as a water passage 33 therebetween sub-stantially centrally in the trapping chamber 29. The main ', coating booth 2 has a lower wall inclined transversely which includes a water drain bit 34 defined in the lower end of the lower wall near one vertical side wall of the main coat-ing booth 2. The main coating booth 2 has an opposite ver-tical side wall to which there is connected an air discharge duct 35 connected to an air discharge fan 36. A vertical baffle plate 37 is connected to and extends downwardly from the water guide panel 32a, and a vertical baffle plate 37 is ', connected to and extends downwardly from the water guide panel 32b. Another vertical baffle plate 37 is connected to ', and extends upwardly from the lower wall of the main coating booth 2 adjacent to the vertical baffle plate 37 connected to the water guide panel 32b. ' The coating repairing booth 6 is much simpler in ' structure than the main coating booth 2. However, the coat-ing repairing booth 6 provides good coating conditions.
Specifically, when air was supplied from the air inlet ducts 10 into the coating repairing booth 6 at a rate of 140 m3/min. and discharged from the coating repairing booth 6 by the air discharge fan 21 at a rate of 140 m3/min., the air flew at points "a" - "j" (see FIG. 2) in the coating repair-ing booth 6 at respective speeds of 0.40 m/sec. at the point "a", 0.45 m/sec. at the point "b", 0.45 m/sec. at the point "c", 0.40 m/sec. at the point "d", 0.40 m/sec. at the point "e", 0.40 m/sec. at the point "f", 0.40 m/sec. at the point "g", 0.40 m/sec. at the point "h", 0.40 m/sec. at the point "i", and 0.40 m/sec. at the point "j" as measured by an ane-mometer Model 6151, and it was found that the air speeds were appropriate s_n the range from 0.40 m/sec. to 0.45 m/sec.
The bumper W is placed on a repairing carriage 38 which can travel along the workpiece feed path in the coat-ing repairing booth 6, and is coated by a coating gun 40. A
mist of coating solution suspended in the coating repairing booth 6 is collected by the air flowing in the coating re-pairing booth 6, and delivered into the air discharge dram-ber 119 from which the coating solution mist is discharged into the trapping chamber 29 in the main coating booth 2 by the air discharge fan 21. Therefore, no trapping chamber is needed in the coating repairing booth 6, which may thus be relatively simple in structure and small in size.
The drying furnace 8 will be described below with reference to FIGS.. 6 through 8. As shown in FIG. 6, the drying furnace 8 comprises a batch drying furnace for drying a batch of coated bumpers W carried on a drying carriage 41 which travels alOIlg a carriage path in the drying furnace 8.
As shown in FIGS. 7 and 8, the drying furnace 8 has a pair of double-leafed hinged doors 42 at inlet and outlet open-ings thereof through which the drying carriage 41 can move into and out of the drying furnace 8. As shown in FIG. 6, ;,, the drying furnace 8 has a hot air supply port 43 defined in a lower portion of a vertical side wall 8a thereof which extends along the carriage path, the hot air support port 43 ', being connected to a hot air supply duct 44. The drying furnace 8 has a plurality of longitudinally spaced hot air discharge ports 45 defined in an upper portion of an oppo-site vertical side wall 8b thereof and connected to respec-tive hot air discharge ducts 46 that are joined to an outer surface of the vertical side wall 8b.
The drying carriage 41 comprises a vertical side frame 47, a pair of front and rear sets of three vertically spaced horizontal support bars 48 extending laterally from ', the vertical side frame 47, and three workpiece support rods 49 supported vertically on each of the horizontal support bars 48. Each of the bumpers W is supported by a pair of front and rear workpiece support rods 49. Therefore, a to-tal of nine bumpers W can be carried by one drying carriage 41. The drying furnace 8 can accommodate three drying car-riages 41 at a time.
For drying coated surfaces of the bumpers w within a short period of time in the drying furnace 8, it is preferable to quickly achieve a desired temperature in the ', drying furnace 8 after hot air has started to be supplied into the drying furnace 8 and thereafter keep the desired temperature stably in the drying furnace 8.
A test was conducted by placing three drying car-riages 41 in the drying furnace 8, closing the double-leafed ', hinged doors 42, supplying hot air at 85°C from the hot air supply port 43 into the drying furnace 8, and observing tem-peratures in the drying furnace 8. The temperatures meas-ured at respective points "a" - "f" (see FIG. 6) in the dry-ing furnace 8, as they varied with time, are plotted in FIG.
9. A study of FIG. 9 indicates that the temperatures meas-ured at the points "a" and "b" in the drying furnace 8 reached 85°C in about 25 minutes and were constant subse-quently, and the temperatures measured at the points "c" -- ' "f" on surfaces of bumpers W reached 80°C in about 25 min-utes and were constant subsequently.
It can be seen from FIG. 9 that the temperatures ', in the drying furnace 8 can rise quickly and can subse-quently be kept at constant levels. When bumpers W carried on the three drying carriages 41 were dried in the drying furnace 8, the coated surfaces of the bumpers W were uni-formly dried in about 55 minutes after they began to be dried. Therefore, items or parameters to be controlled in the drying furnace 8 may be only the temperature of the hot air and the time for which the hot air is supplied. The drying furnace 8 itself is quite simple in structure.
when a bumper W coated in the coating repairing booth 6 is delivered into the storage booth 7 by the repair-ing carriage 38, the bumper W is transferred onto the drying carriage 41 and stored in the storage booth 7. When the number of stored bumpers W in the storage booth 7 reaches a predetermined number, the bumpers W are then delivered into ,,>,..~r~
the drying furnace 8 by the drying carriage 41. In this manner, the bumpers W c:an be dried with high energy effi-ciency in the drying furnace 8.
Any bumper W which has been coated in the main coating booth 2 in the main coating line 1 is inspected in the inspecting section 3. If the coating layer of the bumper W is found normal, then it is discharged as a com-pleted product leftward from the inspecting section 3. If the coated bumper W suffers a coating defect, then it is transferred rightward to the coating repairing line 4 in which the coating layer_ around the coating defect of the bumper W is removed in the grinding section 5 and then the bumper W is delivered into the coating repairing booth 6 in which it is locally recoated.
Though no dynamic and static pressure chambers are defined in the coating repairing booth 6, air flows at appropriate rates and speeds in the coating chamber 14, al-lowing the bumper W to be coated under stable conditions.
Since a collected mist of coating solution is discharged into the trapping chamber 29 in the main coating booth 6, no dedicated trapping chamber is required in the coating re-pairing booth 6, and hence the coating repairing booth 6 may be small in size and simple in structure.
A bumper W whose defective coating layer has been repaired is placed on the repairing carriage 38 and carried into the storage booth 7 where the bumper W is transferred onto a drying carriage 41. The bumper W remains stored in ... ~r__._...~.._.~_...~~R.~.n~.~.,~.. , w.~~~
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the storage booth 7 until a predetermined number of bumpers ', W are accumulated in the storage booth 7. When the number of stored bumpers W in the storage booth 7 reaches a prede-termined number, the bumpers W are delivered altogether to he drying furnace 8. The drying furnace 8 is then supplied with hot air for a certain period of time, after which the bumpers W are unloaded from the drying furnace 8. In this manner, bumpers W with defective coating layers can effi-ciently be repaired in the dedicated coating repairing line 4.
As described above, when a workpiece with a coat-ing defect is discovered in the inspecting step of the main coating line of the coating line system according to the first embodiment, the workpiece is delivered into the coat-ing repairing booth of the coating repairing line, locally recoated in the coating repairing booth, and then delivered to the drying furnace in which the workpiece is dried.
Therefore, workpieces with normal and defective coating lay-ers are not simultaneously present in the main coating booth of the main coating line, and any workpieces with coating defects can efficiently be repaired smoothly.
The air discharge chamber is connected to one of the vertical side walls of the coating repairing booth lat-erally of the workpiece feed path in the coating repairing booth, and is held in communication with the trapping cham ber in the main coating booth of the main coating line.
Since the trapping chamber in the main coating booth is shared by the main coating booth and the coating repairing ', booth, the coating repairing booth requires no dedicated ', trapping chamber therein and hence is relatively simple in structure.
The hot air supply duct is connected to the lower portion of one of the side walls of the drying furnace, and the hot air discharge ducts are connected to the upper por-tion of the other side wall of the drying furnace. With this arrangement, the temperature in the drying furnace can ', be increased in a relatively short period of time, and sub-sequently maintained at a constant temperature. The drying ', furnace is also relatively simple in structure.
The coating repairing booth has the air direction adjusting members connected to the respective open ends of the air inlet ducts joined to the upper wall of the coating repairing booth. The interior space of the coating repair-ing booth is divided into the upper air direction adjusting chamber and the lower coating chamber by the horizontal fil-ter. The air direction adjusting slats are attached to the ', upper surface of the filter, and the air discharge duct is connected to one side wall of the lower coating chamber.
With this arrangement, the speed of air flowing in the lower coating chamber can be kept at a constant level though no dynamic and static pressure chambers are defined in the coating repairing booth. The coating repairing booth is thus relatively simple in structure. ', ~~._~....~~.._~..~.,m.x .-~ ------...~,.~.. n ..pe.._~
A coating line system for repairing a coating defect of a bumper which is caused in a main coating line, according to a second embodiment of the present invention will be described below. According to the second embodi-ment, the main coating line differs from the main coating line according to the first embodiment. ', FIG. 12 shows an operation sequence of a conven-tional bumper repairing process. As shown in FIG. 12, a bumper is coated in a coating section S100 (coating step) of a main coating line 11, and then inspected in an inspecting section S101 (inspecting step). If the inspected bumper needs to be polished, then it is polished in a polishing section S102 (polishing step), and thereafter inspected in an inspecting section 5103 (inspecting step). If the in-spected bumper is rejecaed in the inspecting section S101, then it is sent to a sandpaper rubbing section S104 (sandpaper rubbing step) in which the bumper is sandpapered in its entirety, but not just a defective coating layer thereof. Thereafter, the bumper is recoated in its entirety in the coating section S100 of the main coating line. ', With the conventional bumper repairing process shown in FIG. 12, since even those portions of bumpers which do not need to be coated again are recoated, the entire re-pairing process is tedious and time-consuming, and consumes a large amount of coating solution. Moreover, inasmuch as bumpers with defecting coatings are repaired in the coating _ 2p _ section S100 of the main~ coating line 11, the productivity of the coating process is comparatively low.
The coating line system according to the second embodiment has been devised in an attempt to eliminate the above drawbacks of the conventional bumper repairing proc-ess. The coating line system according to the second em-bodiment is relatively simple in structure and capable of easily and efficiently repairing coating defects on coated bumpers while saving resources and energy.
A bumper repairing process of the coating line system according to the second embodiment is illustrated in FIG. 10.
As shown in FIG. 10, a bumper W is coated in a coating section S1 (coating step) of a main coating line 11.
Specifically, in the coating section S1, the bumper w is treated with a chlorine solvent, coated with a primer, I
coated with a top coat of enamel and clear lacquer, and dried with circulating hot air. After the bumper W is coated, its coating layer is inspected in an inspecting sec-tion S2 (inspecting step). If the bumper W is accepted, then it is delivered to a next section S3 (next step) of the main coating line 11. If the bumper W needs to be polished, then it is sent to a polishing section S4 (polishing steps S4a; S4b, S4c) where it is polished. If the bumper W is rejected, i.e., if the bumper W has a large defective coat-ing area greater than a postcard and cannot be repaired in a spot thereon, then it is delivered to a sandpaper rubbing section S5 (sandpaper rubbing step) in which the bumper is sandpapered. Thereafter, the bumper w is recoated in the coating section S1 (coating step) of the main coating line 11.
In the polishing section S4, the bumper W is ground with sandpaper <~nd polished with a very fine compound in the step S4a, glossed with a compound in the step S4b, and treated with a wax to remove white blurs from the bumper W in the step S4c. ', After the bumper W is polished in the polishing section S4, it is inspected in a second inspecting section S6 (inspecting step). If the bumper W is accepted, it is delivered to the next section S3 (next step) of the main coating line 11. If the bumper W is rejected, then it is coated in a spot thereon in a spot coating section S7 (spot ', coating steps S7a -- S7e) and dried in a drying section S8 (drying step).
In the spot coating section S7, the bumper W is successively corrected in its polished condition with sand-paper in the step S7a, cleaned with a white damp in the step S7b, roughened with uniwool, sandpaper, or a compound in the step S7c, coated with a top coat of enamel and clear lacquer in the step S7d, and blurred with a blurring solution in the step S7e. Thereafter, the bumper W is dried with circulat-ing hot air in a drying section S8.
In the roughening step S7c, the bumper W is roughened with a selected one of uniwool, sandpaper, and a compound. In the top coating step S7d, the bumper W is coated using the same coating solution, composed of a paint, ', a hardener, and a thinner, as the coating solution used in the coating section S1 of the main coating line 11. The blurring solution used in the blurring step S7e comprises 2 o by weight of a hardener, 8 % by weight of a clear lacquer, - 45 % by weight of a thinner, and 45 % -- 80 % by weight of a retarder. The thinner may be a thinner for Soflex clear lacquer, for example, manufactured by Kansai Paint 10 Co., Ltd. and the retarder may be a Hiart # 3000 retarder, ', for example, manufactured by Isamu Paint Co., Ltd. If the amount of the retarder were less than 45 o by weight, then the bumper surface would become less smooth and suffer blur-ring marks, requiring the bumper W to be processed in longer time and with greater efforts in the step S4a. If the amount of the retarder were more than 80 o by weight, then the blurring solution would not adhere closely to the top coat on the bumper W.
As shown in FIG. 11, the drying section S8 has a ', spot drying furnace 51 for drying bumpers W with circulating hot air at 80°C for 30 minutes which is supplied from a main line drying furnace 50 which is disposed in the coating sec-tion S1 of the main coating line 11. The spot drying fur-nace 51 is connected to the main line drying furnace 50 through a circulating duct 52 having an air fan 53 disposed near an inlet port of the spot drying furnace 51. The spot drying furnace 51 is controlled through a control console 54.
The bumpers W which are carried on a carriage 55 are dried with circulating hot air at 80°C for 30 minutes in the main line drying furnace 50 while the bumpers W are be-ing fed in the main line drying furnace 50 by the carriage 55. If no hot air needs to be introduced from the main line drying furnace 50 into the spot drying furnace 51, then the air fan 53 is not actuated, and the hot air circulates only ', in the main line drying furnace 50.
For drying a predetermined number of bumpers W
coated in the spot coating section S7 with the spot drying furnace 51, the bumpers W are carried on the carriage 57 and delivered into the spot drying furnace 51, and the air fan 53 is actuated to introduce hot air from the main line dry-ing furnace 50 into the spot drying furnace 51 through the circulating duct 52. At the same time, the hot air is cir-culated between the main line drying furnace 50 and the spot drying furnace 51 in order to be kept at 80°C at all times.
In this manner, the bumpers W can be dried also in the spot drying furnace 51 with circulating air at 80°C for 30 min-utes.
Each of the dried bumpers W is polished again in the polishing section S4 (polishing steps S4a, S4b, S4c).
After the bumper W is polished in the polishing section S4, it is inspected again in the inspecting section S6. If the inspected bumper W is accepted, then it is delivered to the ~v~~rz~~
next section S3 of the main coating line 11. If the in-spected bumper W is rejected, it is recoated in a spot thereon in the spot coating section S7 and then dried in the drying section S8.
The coating line system according to the second embodiment is effective to reduce the amount of a coating solution which is consumed and hence to save resources re-quired to coat bumpers W. Since polished bumpers W which are rejected can be repaired without using the coating sec-tion S1 of the main coating line, the productivity of the main coating line can be increased. Furthermore, polished bumpers W are dried with heat supplied from the main line drying furnace, the running cost of the coating line system is relatively low, and the coating line system is effective to save energy required to coat bumpers W.
Although certain preferred embodiments of the present invention have been shown and described in detail, it should be understood that various changes and modifica tions may be made therein without departing from the scope of the appended claims.
_.________. _-_~_ ~.~,~..~,,~,~ ..~ .~....~.~~.,...~.r,._. _.__
Claims (10)
1. A coating line system comprising:
a main coating line including at least a main coating booth for coating workpieces; and a coating repairing line branched from said main coating line;
said coating repairing line having;
coating repairing means for repairing a coating defect of a defective workpiece which is caused in said main coating line, said coating repairing means having a coating repairing booth for recoating a localized coating defect surface of the defective workpiece with a mist of coating solution, said coating repairing booth having a workpiece feed path for delivering the defective workpiece therealong, said coating repairing booth also having a side wall and an air discharge chamber connected to said side wall laterally of said workpiece feed path, said coating line system further having an air discharge duct with an air discharge fan therein, said main coating booth having a trapping chamber, said air discharge chamber communicating with said trapping chamber through said air discharge duct with said air discharge fan therein so as to process said mist of coating solution; and drying means disposed downstream of said coating repairing means along said coating repairing line, for drying the workpiece which has been repaired by said coating repairing means.
a main coating line including at least a main coating booth for coating workpieces; and a coating repairing line branched from said main coating line;
said coating repairing line having;
coating repairing means for repairing a coating defect of a defective workpiece which is caused in said main coating line, said coating repairing means having a coating repairing booth for recoating a localized coating defect surface of the defective workpiece with a mist of coating solution, said coating repairing booth having a workpiece feed path for delivering the defective workpiece therealong, said coating repairing booth also having a side wall and an air discharge chamber connected to said side wall laterally of said workpiece feed path, said coating line system further having an air discharge duct with an air discharge fan therein, said main coating booth having a trapping chamber, said air discharge chamber communicating with said trapping chamber through said air discharge duct with said air discharge fan therein so as to process said mist of coating solution; and drying means disposed downstream of said coating repairing means along said coating repairing line, for drying the workpiece which has been repaired by said coating repairing means.
2. The coating line system according to claim 1, wherein said drying means comprises a storage booth for storing a predetermined number of workpieces recoated in said coating repairing booth, and a drying furnace for drying said predetermined number of workpieces delivered from said storage booth; and wherein said drying furnace has a pair of spaced side walls, further comprising a hot air supply duct connected to a lower portion of one of said side walls and a hot air discharge duct connected to an upper portion of the other said side walls.
3. The coating line system of claim 1, wherein said coating repairing booth comprises:
an upper wall and a side wall connected thereto, said upper wall having an opening defined therein;
an air inlet duct connected to said opening in the upper wall for introducing air into the coating repairing booth through said opening;
an air direction adjusting member disposed in said coating repairing booth and connected to said opening, for distributing air into said coating repairing booth;
a filter disposed in said coating repairing booth for dividing an interior space thereof into an upper air direction adjusting chamber housing for said air direction adjusting member and a lower coating chamber disposed below said upper air direction adjusting chamber for recoating a localized coating defect surface of the workpiece;
air direction adjusting means disposed on an upper surface of said filter;
and an air discharge port defined in said side wall for discharging air from said lower coating chamber.
an upper wall and a side wall connected thereto, said upper wall having an opening defined therein;
an air inlet duct connected to said opening in the upper wall for introducing air into the coating repairing booth through said opening;
an air direction adjusting member disposed in said coating repairing booth and connected to said opening, for distributing air into said coating repairing booth;
a filter disposed in said coating repairing booth for dividing an interior space thereof into an upper air direction adjusting chamber housing for said air direction adjusting member and a lower coating chamber disposed below said upper air direction adjusting chamber for recoating a localized coating defect surface of the workpiece;
air direction adjusting means disposed on an upper surface of said filter;
and an air discharge port defined in said side wall for discharging air from said lower coating chamber.
4. The coating line system of claim 3, wherein said air direction adjusting means comprises a plurality of air direction adjusting slats disposed on said upper surface of said filter and extending along a workpiece feed path in said lower coating chamber;
wherein said air direction adjusting slats are slanted such that the air direction adjusting slat which is the remotest from said air discharge port is vertical, and the remaining air direction adjusting slats are slanted through progressively greater angles toward the air discharge port so as to cause those air direction adjusting slats which are positioned closer to said air discharge port to direct air streams farther away from said air discharge port.
wherein said air direction adjusting slats are slanted such that the air direction adjusting slat which is the remotest from said air discharge port is vertical, and the remaining air direction adjusting slats are slanted through progressively greater angles toward the air discharge port so as to cause those air direction adjusting slats which are positioned closer to said air discharge port to direct air streams farther away from said air discharge port.
5. A coating line system comprising:
a main coating line including at least a main coating booth for coating workpieces, said main coating line further including a first inspecting section for inspecting a coated condition of the workpieces after the workpieces are coated in said main coating booth to determine whether each of the workpieces is accepted as a nondefective workpiece for being delivered to a next step in said main coating line, rejected as a defective workpiece, or is a workpiece in need of polishing, said main coating line also including a polishing section for polishing the workpiece in need of polishing, said polishing section including means for successively polishing the workpiece, glossing the workpiece, and removing white blurs from the workpiece, said main coating line still further including a second inspecting section for inspecting a polished condition of the workpiece from said polishing section to determine whether the workpiece is accepted for being delivered to the next step or rejected, said main coating line yet further including a main line drying furnace for drying the nondefective workpiece;
a coating repairing line branched from said main coating line;
said coating repairing line having:
a coating repairing means for repairing a coating defect of said defective workpiece which is caused in said main coating line, said coating repairing means including a spot coating section for recoating defect spots on the defective workpiece to obtain a recoated workpiece; and drying means disposed downstream of said coating repairing means, for drying the recoated workpiece which has been repaired by said coating repairing means, said drying means including a spot drying furnace communicating with said main line drying furnace through a circulating duct having therein an air fan thereby drying the recoated workpiece with heat supplied from said main line drying furnace.
a main coating line including at least a main coating booth for coating workpieces, said main coating line further including a first inspecting section for inspecting a coated condition of the workpieces after the workpieces are coated in said main coating booth to determine whether each of the workpieces is accepted as a nondefective workpiece for being delivered to a next step in said main coating line, rejected as a defective workpiece, or is a workpiece in need of polishing, said main coating line also including a polishing section for polishing the workpiece in need of polishing, said polishing section including means for successively polishing the workpiece, glossing the workpiece, and removing white blurs from the workpiece, said main coating line still further including a second inspecting section for inspecting a polished condition of the workpiece from said polishing section to determine whether the workpiece is accepted for being delivered to the next step or rejected, said main coating line yet further including a main line drying furnace for drying the nondefective workpiece;
a coating repairing line branched from said main coating line;
said coating repairing line having:
a coating repairing means for repairing a coating defect of said defective workpiece which is caused in said main coating line, said coating repairing means including a spot coating section for recoating defect spots on the defective workpiece to obtain a recoated workpiece; and drying means disposed downstream of said coating repairing means, for drying the recoated workpiece which has been repaired by said coating repairing means, said drying means including a spot drying furnace communicating with said main line drying furnace through a circulating duct having therein an air fan thereby drying the recoated workpiece with heat supplied from said main line drying furnace.
6. The coating line system according to claim 5, wherein said polishing section comprises means for repolishing a workpiece which has been recoated by said spot coating section.
7. The coating line system according to claim 5, wherein said polishing section comprises means for successively polishing a workpiece, glossing said workpiece, and removing blurs from said workpiece.
8. The coating line system according to claim 5, wherein said main coating line includes a main line drying furnace for drying a workpiece, and said drying means comprises a spot drying furnace communicating with said main line drying furnace for drying a workpiece with heat supplied from said main line drying furnace.
9. A method of repairing a coating defect of a workpiece, comprising the steps of:
coating workpieces in a main coating line, drying nondefective workpieces in a main line drying furnace in said main coating line;
inspecting coated conditions of the workpieces after the workpieces are coated in said main coating line to determine whether each of the workpieces is a nondefective workpiece for being delivered to a next step in said main coating line, rejected as a defective workpiece, or is a workpiece in need of polishing;
delivering the defective workpiece from said main coating line to a coating repairing line branched from said main coating line if the defective workpiece coated in the main coating line has a coating defect;
repairing the coating defect of the defective workpiece in said coating repairing line, said repairing step including recoating the coating defect on the defective workpiece, said recoating step including the steps of successively correcting a polished condition of the defective workpiece, cleaning the defective workpiece, roughening the defective workpiece, coating the defective workpiece with a top coat, and blurring the defective workpiece, wherein to obtain a recoated workpiece;
moving said recoated workpiece to a spot drying furnace; and circulating hot air to dry the recoated workpiece from said mainline drying furnace to said spot drying furnace through a circulating duct having therein an air fan.
coating workpieces in a main coating line, drying nondefective workpieces in a main line drying furnace in said main coating line;
inspecting coated conditions of the workpieces after the workpieces are coated in said main coating line to determine whether each of the workpieces is a nondefective workpiece for being delivered to a next step in said main coating line, rejected as a defective workpiece, or is a workpiece in need of polishing;
delivering the defective workpiece from said main coating line to a coating repairing line branched from said main coating line if the defective workpiece coated in the main coating line has a coating defect;
repairing the coating defect of the defective workpiece in said coating repairing line, said repairing step including recoating the coating defect on the defective workpiece, said recoating step including the steps of successively correcting a polished condition of the defective workpiece, cleaning the defective workpiece, roughening the defective workpiece, coating the defective workpiece with a top coat, and blurring the defective workpiece, wherein to obtain a recoated workpiece;
moving said recoated workpiece to a spot drying furnace; and circulating hot air to dry the recoated workpiece from said mainline drying furnace to said spot drying furnace through a circulating duct having therein an air fan.
10. The method according to claim 9, wherein a predetermined number of recoated workpieces are dried at one time in said spot drying furnace.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23960095A JP3666946B2 (en) | 1995-09-19 | 1995-09-19 | Paint repair line |
| JP7-239600 | 1995-09-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2177295A1 CA2177295A1 (en) | 1997-03-20 |
| CA2177295C true CA2177295C (en) | 2002-08-13 |
Family
ID=17047175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002177295A Expired - Fee Related CA2177295C (en) | 1995-09-19 | 1996-05-24 | Coating line system and method of repairing coating defect |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5922399A (en) |
| JP (1) | JP3666946B2 (en) |
| CA (1) | CA2177295C (en) |
| GB (1) | GB2305376B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19927041A1 (en) * | 1999-06-14 | 2000-12-21 | Herberts Gmbh & Co Kg | Process for refinishing defects in stoving paints with powder coatings |
| DE20104204U1 (en) * | 2001-03-12 | 2001-07-19 | Duerr Systems Gmbh | Hot air dryer for a coating system |
| DE10355562A1 (en) * | 2003-11-28 | 2005-06-30 | Daimlerchrysler Ag | Full repair process by using a plasma process |
| DE102008036321A1 (en) | 2008-07-29 | 2010-02-04 | Dürr Systems GmbH | Painting plant for painting objects to be painted |
| DE102008036322A1 (en) | 2008-07-29 | 2010-02-04 | Dürr Systems GmbH | Interim storage for intermediate storage of objects to be painted |
| US9111886B2 (en) * | 2009-02-10 | 2015-08-18 | Joled Inc. | Method of repairing a defect of an organic EL display |
| US10150135B2 (en) * | 2009-02-24 | 2018-12-11 | Dcr Ip Company, Llc | Vehicle collision repair booth |
| US8943999B2 (en) | 2009-04-06 | 2015-02-03 | Dcr Ip Company, Llc | Vehicle collision repair zone |
| CN104937139A (en) * | 2012-11-29 | 2015-09-23 | 搪玻璃技术股份有限公司 | Methods for preparing and repairing chemically-resistant coatings |
| US10439375B2 (en) | 2014-04-14 | 2019-10-08 | Halliburton Energy Services, Inc. | Wellbore line coating repair |
| US9675999B1 (en) | 2014-05-15 | 2017-06-13 | Glasslined Technologies, Inc. | Facile chemically-resistant coatings |
| JP6432982B2 (en) * | 2015-03-27 | 2018-12-05 | ダイハツ工業株式会社 | Repainting equipment |
| JP6685777B2 (en) * | 2016-03-09 | 2020-04-22 | 三菱重工業株式会社 | Member inspection device and member repair method |
| CN112206957A (en) * | 2020-08-28 | 2021-01-12 | 安徽蓝润自动化仪表有限公司 | Switch board processing is with continuous spraying drying equipment |
| IT202100001382A1 (en) * | 2021-01-26 | 2022-07-26 | New Tech & Service S R L | PAINT DEFECT CORRECTION SYSTEM |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU537274B2 (en) * | 1981-04-23 | 1984-06-14 | Ransburg Corp. | Method of repairing the finish of an article |
| GB2210291B (en) * | 1987-09-30 | 1991-01-30 | Kansai Paint Co Ltd | Method of remedying coating |
| JPH04256467A (en) * | 1991-02-12 | 1992-09-11 | Mazda Motor Corp | Coating repairing method of car body |
| JP3052011B2 (en) * | 1991-08-23 | 2000-06-12 | 本田技研工業株式会社 | Setting booth |
| EP0566958A1 (en) * | 1992-04-22 | 1993-10-27 | Ball Corporation | Method for repairing a defective coating on a coated metal substrate |
| JP3325979B2 (en) * | 1993-12-20 | 2002-09-17 | 本田技研工業株式会社 | Repair method of bumper |
-
1995
- 1995-09-19 JP JP23960095A patent/JP3666946B2/en not_active Expired - Fee Related
-
1996
- 1996-05-24 US US08/655,319 patent/US5922399A/en not_active Expired - Fee Related
- 1996-05-24 CA CA002177295A patent/CA2177295C/en not_active Expired - Fee Related
- 1996-06-04 GB GB9611581A patent/GB2305376B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB9611581D0 (en) | 1996-08-07 |
| GB2305376A (en) | 1997-04-09 |
| US5922399A (en) | 1999-07-13 |
| GB2305376B (en) | 1998-08-12 |
| JP3666946B2 (en) | 2005-06-29 |
| JPH0975802A (en) | 1997-03-25 |
| CA2177295A1 (en) | 1997-03-20 |
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