US20040081720A1 - Method and apparatus for producing brake lining material - Google Patents
Method and apparatus for producing brake lining material Download PDFInfo
- Publication number
- US20040081720A1 US20040081720A1 US10/685,050 US68505003A US2004081720A1 US 20040081720 A1 US20040081720 A1 US 20040081720A1 US 68505003 A US68505003 A US 68505003A US 2004081720 A1 US2004081720 A1 US 2004081720A1
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- United States
- Prior art keywords
- mold
- brake lining
- lining material
- cavity
- frame
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0097—Press moulds; Press-mould and press-ram assemblies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
- B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
- B29C2043/3615—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices
- B29C2043/3618—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices plurality of counteracting elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5833—Measuring, controlling or regulating movement of moulds or mould parts, e.g. opening or closing, actuating
- B29C2043/5841—Measuring, controlling or regulating movement of moulds or mould parts, e.g. opening or closing, actuating for accommodating variation in mould spacing or cavity volume during moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
- B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
- B29C31/06—Feeding of the material to be moulded, e.g. into a mould cavity in measured doses, e.g. by weighting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2103/00—Use of resin-bonded materials as moulding material
- B29K2103/04—Inorganic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2503/00—Use of resin-bonded materials as filler
- B29K2503/04—Inorganic materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/127—Spring
Definitions
- the present invention relates to brake lining material. More particularly, the present invention relates to a method and apparatus for the manufacture of the brake lining material used in various braking applications.
- the drum brake is known as an internal expansion brake and it includes a brake drum having an internal generally circular cylindrical braking surface.
- the brake drum normally rotates with the vehicles wheel or with a rotating component of a machine tool.
- One or more brake shoes are located within the center of the circular cylindrical braking surface.
- the brake shoes have a frame onto which is attached a sacrificial brake lining which is shaped to mate with the braking surface of the brake drum. The rotating wheel or component is stopped by radially extending the brake shoe such that the sacrificial lining frictionally engages the braking surface on the brake drum.
- the energy of the rotating wheel or component is dissipated by the frictional engagement between the braking surface of the brake drum and the brake lining on the brake shoe.
- the sacrificial lining is worn away and has to be replaced in order for the braking system to continue to function. Normally this involves the replacement of the brake shoe and the resurfacing of the braking surface of the brake drum.
- the worn brake shoe is not discarded, it is sent back to a rebuilder who removes the old lining from the frame and replaces it with a new lining.
- the brake linings generally are circular cylindrical segments which may be bonded, riveted or otherwise attached to the frame of the brake shoe.
- the material for the brake lining is normally supplied in a flat rectangular shape.
- the material is either of the proper dimensions to form the lining for the brake shoe or the flat rectangular sheet of material is cut into one or more rectangular pieces to form the brake lining material.
- the final sized flat rectangular piece of brake lining material is then formed into a curved shape and attached to the frame of the brake shoe by bonding methods, riveting or the like.
- the flat rectangular shape of brake lining material is formed in a press having a mold of the proper dimensions for the brake lining material.
- a pellet of uncured brake lining material is inserted into the mold and a punch is pressed against the pellet of material forcing it to fill the mold and thus take on the desired flat rectangular shape.
- the punch is continuously moved toward the open mold until it contacts a stop which is usually the top surface of the mold.
- the punch retracts and ejector pins push the completed brake lining material out of the mold.
- the pellet is sized to be larger than the volume of the mold. Typically, the pellet is 5% larger than the volume of the mold. This excess material is formed as molding flash which must be trimmed from the finished sheet of brake lining material and then discarded.
- the conventional methods of manufacturing a sheet of brake lining material suffer from two disadvantages. First, it is necessary to build into the process a 5% waste factor due to the need to completely fill the mold. Second, the 5% waste ends up as mold flash which requires an additional trimming operation before the material can be used.
- the present invention provides the art with a method and apparatus for producing a sheet of brake lining material without using excess material and thus eliminating the accompanying scrap and the additional manufacturing operation.
- the present invention utilizes a stepped mold base around which is disposed a mold frame.
- the mold frame is movable with respect to the mold base.
- a precise amount of brake lining material is placed within the mold frame which is then covered.
- the forming press then engages the mold and presses against the mold to move the mold frame and layer with respect to the base until a predetermined pressure is reached and not to a predetermined stop.
- the positive pressure molding is permitted because of the design of the mold where the mold frame is free to move with respect to the base.
- the thickness of the molded sheet will be dictated by the amount of material in the preformed pellet with the positive pressure molding ensuring complete fill of the mold.
- FIG. 1 is a perspective view of a generally flat rectangular sheet of brake lining material
- FIG. 2 is an exploded perspective view of the mold assembly utilized to manufacture the brake lining material shown in FIG. 1;
- FIG. 3 is a side elevational view of the mold base shown in FIG. 2;
- FIG. 4 is a side elevational view of the mold frame assembled to the mold base shown in FIG. 3;
- FIG. 5 is a side elevational view of the cover assembled to the mold frame and the mold base shown in FIG. 4;
- FIG. 6 is a side cross-sectional view of the mold assembly shown in FIG. 5;
- FIG. 7 is a side elevational view showing the ejection of the completed sheet of brake lining material.
- FIG. 1 a typical sheet of brake lining material which is designated generally by the reference numeral 10 .
- Brake lining material 10 is manufactured to a specified rectangular shape and thickness such that it can be formed into the desired shape to be secured to the frame of a brake shoe.
- brake lining material 10 is designed such that it can be cut into a plurality of blanks for mating with the frame of a brake shoe as shown by the broken lines in FIG. 1.
- Mold assembly 20 which is used to manufacture brake lining material 10 is disclosed.
- Mold assembly 20 comprises a mold base 22 , a mold frame 24 , a cover 26 all of which combine to form a mold cavity 28 .
- Mold base 22 is shown in FIGS. 2 and 3 and it comprises a support structure 30 , an upright platform 32 and a plurality of conical springs 34 .
- Platform 32 includes an upper surface 36 which forms a portion of mold cavity 28 for molding material 10 .
- the plurality of conical springs 34 are spaced around the perimeter of platform 32 and are preferably secured to support structure 30 .
- Conical springs 34 are utilized due to their ability to be compressed to a height equal to the wire diameter of the spring. This permits the ejection of the finished brake lining material 10 as will be described later herein.
- mold frame 24 comprises four walls 40 , 42 , 44 and 46 which define a rectangular cavity 48 .
- Cavity 48 is sized to be slidingly received over platform 32 of mold base 22 .
- the interior surface of cavity 48 forms another portion of mold cavity 28 for molding material 10 .
- mold frame 24 is slidingly received over platform 32 and is supported by the plurality of springs 34 .
- Cover 26 is placed on the upper surface of mold frame 24 to complete and close mold cavity 28 .
- Cover 26 is a generally rectangular component of suitable thickness to withstand the molding pressures with minimal deflection and/or distortion.
- the molding of brake lining material 10 begins with cover 26 being removed from mold frame 24 and with mold frame 24 being assembled to mold base 22 as shown in FIG. 4.
- a pre-specified amount or volume of material is placed into open cavity 28 .
- the amount of material is determined by the size of brake lining material 10 which is going to be produced.
- the outside dimensions of cavity 28 are defined by mold frame 24 .
- any variation in the amount of material initially placed within cavity 28 will result in a variation of the thickness of the finished brake lining material 10 . This is because the sliding movement of mold frame 24 with respect to mold base 22 allows cavity 28 to have a variable volume to accommodate the variation in the amount of material initially placed within cavity 28 .
- the variation in the thickness of the finished brake lining material 10 will be minimized. Also, because the variation in the amount of material initially placed within cavity 28 will be spread out over the entire surface area of the finished brake lining material 10 , the variation in the thickness of the finished brake lining material will be minute.
- cover 26 is moved towards mold frame 24 .
- Mold assembly 20 is normally placed within a press with mold base 22 and mold frame 24 being disposed in the base of the press and cover 26 being disposed on the roof of the press.
- cover 26 contacts either the pre-specified material within cavity 28 or the upper surface of mold frame 24 depending on the size and shape of the material in comparison with cavity 28 .
- the ram forces cover 26 downward, the material is formed into the shape of cavity 28 with the plurality of springs 34 compressing as the ram moves downward.
- the ram of the press continues downward until a pre-determined molding pressure is applied to the brake lining material.
- mold assembly 20 with the variable height and thus volume for cavity 28 allows for the continued movement of mold frame 24 with respect to mold base 22 allowing for brake lining material 10 to resist the pressure being applied by the press.
- This positive pressure molding technique ensures complete filling of cavity 28 and the elimination of molding flash and thus the elimination of any scrap material.
- FIG. 7 the ejection of brake lining material 10 from mold assembly 20 is disclosed. Due to the unique construction of mold assembly 20 , the typical ejector pins for the mold assembly are not required. Instead, the ejection of brake lining material 10 from mold assembly 20 is accomplished by first removing cover 26 and then exerting a force on the upper surface of mold frame 24 . Mold frame 24 will slide downward along mold base 22 collapsing the plurality of conical springs 34 . The plurality of conical springs 34 are able to collapse to a height equal to the diameter of the wire of the springs.
- mold assembly 20 has been illustrated and described using the plurality of conical springs 34 , it is within the scope of the present invention to utilize any of the other types of compression springs.
- the requirement for ejection of the brake lining material is that the height of platform 32 must be sufficient for mold frame 24 to slide along such that platform 32 extends level with or above the upper surface of mold frame 24 to eject the brake lining material.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Braking Arrangements (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
An apparatus and method for producing a sheet of brake lining material utilizes a mold which has a mold base and a mold frame. The mold frame is slidingly received on the mold base. The sliding relationship between the mold frame and the mold base results in a mold cavity which has a variable volume. The variable volume of the mold cavity allows the cavity to adjust to the size of material initially placed in the mold cavity thereby eliminating any mold flash and/or scrap material.
Description
- The present invention relates to brake lining material. More particularly, the present invention relates to a method and apparatus for the manufacture of the brake lining material used in various braking applications.
- The automotive industry, including both cars and trucks, and the manufacturing community utilize drum brakes for their braking systems. The drum brake is known as an internal expansion brake and it includes a brake drum having an internal generally circular cylindrical braking surface. The brake drum normally rotates with the vehicles wheel or with a rotating component of a machine tool. One or more brake shoes are located within the center of the circular cylindrical braking surface. The brake shoes have a frame onto which is attached a sacrificial brake lining which is shaped to mate with the braking surface of the brake drum. The rotating wheel or component is stopped by radially extending the brake shoe such that the sacrificial lining frictionally engages the braking surface on the brake drum. The energy of the rotating wheel or component is dissipated by the frictional engagement between the braking surface of the brake drum and the brake lining on the brake shoe. Over time and use, the sacrificial lining is worn away and has to be replaced in order for the braking system to continue to function. Normally this involves the replacement of the brake shoe and the resurfacing of the braking surface of the brake drum. The worn brake shoe is not discarded, it is sent back to a rebuilder who removes the old lining from the frame and replaces it with a new lining. The brake linings generally are circular cylindrical segments which may be bonded, riveted or otherwise attached to the frame of the brake shoe.
- The material for the brake lining is normally supplied in a flat rectangular shape. The material is either of the proper dimensions to form the lining for the brake shoe or the flat rectangular sheet of material is cut into one or more rectangular pieces to form the brake lining material. The final sized flat rectangular piece of brake lining material is then formed into a curved shape and attached to the frame of the brake shoe by bonding methods, riveting or the like.
- Conventionally, the flat rectangular shape of brake lining material is formed in a press having a mold of the proper dimensions for the brake lining material. A pellet of uncured brake lining material is inserted into the mold and a punch is pressed against the pellet of material forcing it to fill the mold and thus take on the desired flat rectangular shape. The punch is continuously moved toward the open mold until it contacts a stop which is usually the top surface of the mold. Once the material has been fully cured, the punch retracts and ejector pins push the completed brake lining material out of the mold. In order to ensure that a complete fill of the mold is obtained, the pellet is sized to be larger than the volume of the mold. Typically, the pellet is 5% larger than the volume of the mold. This excess material is formed as molding flash which must be trimmed from the finished sheet of brake lining material and then discarded.
- Thus, the conventional methods of manufacturing a sheet of brake lining material suffer from two disadvantages. First, it is necessary to build into the process a 5% waste factor due to the need to completely fill the mold. Second, the 5% waste ends up as mold flash which requires an additional trimming operation before the material can be used.
- The continued development of manufacturing processes for the brake lining materials has been directed towards method of eliminating the excess material, the accompanying scrap and the additional manufacturing operation required because of the excess material.
- The present invention provides the art with a method and apparatus for producing a sheet of brake lining material without using excess material and thus eliminating the accompanying scrap and the additional manufacturing operation. The present invention utilizes a stepped mold base around which is disposed a mold frame. The mold frame is movable with respect to the mold base. A precise amount of brake lining material is placed within the mold frame which is then covered. The forming press then engages the mold and presses against the mold to move the mold frame and layer with respect to the base until a predetermined pressure is reached and not to a predetermined stop. The positive pressure molding is permitted because of the design of the mold where the mold frame is free to move with respect to the base. Thus, the thickness of the molded sheet will be dictated by the amount of material in the preformed pellet with the positive pressure molding ensuring complete fill of the mold.
- Other advantages and objects of the present invention will become apparent to those skilled in the art from the subsequent detailed description, appended claims and drawings.
- In the drawings which illustrate the best mode presently contemplated for carrying out the present invention:
- FIG. 1 is a perspective view of a generally flat rectangular sheet of brake lining material;
- FIG. 2 is an exploded perspective view of the mold assembly utilized to manufacture the brake lining material shown in FIG. 1;
- FIG. 3 is a side elevational view of the mold base shown in FIG. 2;
- FIG. 4 is a side elevational view of the mold frame assembled to the mold base shown in FIG. 3;
- FIG. 5 is a side elevational view of the cover assembled to the mold frame and the mold base shown in FIG. 4;
- FIG. 6 is a side cross-sectional view of the mold assembly shown in FIG. 5;
- FIG. 7 is a side elevational view showing the ejection of the completed sheet of brake lining material.
- Referring now to the drawings in which like reference numerals designate like or corresponding parts throughout the several views, there is shown in FIG. 1 a typical sheet of brake lining material which is designated generally by the
reference numeral 10.Brake lining material 10 is manufactured to a specified rectangular shape and thickness such that it can be formed into the desired shape to be secured to the frame of a brake shoe. As shown in FIG. 1,brake lining material 10 is designed such that it can be cut into a plurality of blanks for mating with the frame of a brake shoe as shown by the broken lines in FIG. 1. - Referring now to FIG. 2, a
mold assembly 20 which is used to manufacturebrake lining material 10 is disclosed.Mold assembly 20 comprises amold base 22, amold frame 24, acover 26 all of which combine to form amold cavity 28. - Mold
base 22 is shown in FIGS. 2 and 3 and it comprises asupport structure 30, anupright platform 32 and a plurality ofconical springs 34.Platform 32 includes anupper surface 36 which forms a portion ofmold cavity 28 formolding material 10. The plurality ofconical springs 34 are spaced around the perimeter ofplatform 32 and are preferably secured to supportstructure 30.Conical springs 34 are utilized due to their ability to be compressed to a height equal to the wire diameter of the spring. This permits the ejection of the finishedbrake lining material 10 as will be described later herein. - Referring now to FIGS. 2 and 4,
mold frame 24 comprises fourwalls rectangular cavity 48.Cavity 48 is sized to be slidingly received overplatform 32 ofmold base 22. The interior surface ofcavity 48 forms another portion ofmold cavity 28 formolding material 10. As shown in FIG. 4mold frame 24 is slidingly received overplatform 32 and is supported by the plurality ofsprings 34. - Referring now to FIGS. 2, 5 and6, the
complete mold assembly 20 is illustrated.Cover 26 is placed on the upper surface ofmold frame 24 to complete and closemold cavity 28.Cover 26 is a generally rectangular component of suitable thickness to withstand the molding pressures with minimal deflection and/or distortion. - The molding of
brake lining material 10 begins withcover 26 being removed frommold frame 24 and withmold frame 24 being assembled tomold base 22 as shown in FIG. 4. A pre-specified amount or volume of material is placed intoopen cavity 28. The amount of material is determined by the size ofbrake lining material 10 which is going to be produced. The outside dimensions ofcavity 28 are defined bymold frame 24. Thus, any variation in the amount of material initially placed withincavity 28 will result in a variation of the thickness of the finishedbrake lining material 10. This is because the sliding movement ofmold frame 24 with respect tomold base 22 allowscavity 28 to have a variable volume to accommodate the variation in the amount of material initially placed withincavity 28. By maintaining minimal variation in the amount of material initially placed withincavity 28, the variation in the thickness of the finishedbrake lining material 10 will be minimized. Also, because the variation in the amount of material initially placed withincavity 28 will be spread out over the entire surface area of the finishedbrake lining material 10, the variation in the thickness of the finished brake lining material will be minute. - Once the pre-specified amount of material is placed within
cavity 28, cover 26 is moved towardsmold frame 24.Mold assembly 20 is normally placed within a press withmold base 22 andmold frame 24 being disposed in the base of the press and cover 26 being disposed on the roof of the press. As the press is cycled, cover 26 contacts either the pre-specified material withincavity 28 or the upper surface ofmold frame 24 depending on the size and shape of the material in comparison withcavity 28. As the ram forces cover 26 downward, the material is formed into the shape ofcavity 28 with the plurality ofsprings 34 compressing as the ram moves downward. The ram of the press continues downward until a pre-determined molding pressure is applied to the brake lining material. The unique construction ofmold assembly 20 with the variable height and thus volume forcavity 28 allows for the continued movement ofmold frame 24 with respect tomold base 22 allowing forbrake lining material 10 to resist the pressure being applied by the press. This positive pressure molding technique ensures complete filling ofcavity 28 and the elimination of molding flash and thus the elimination of any scrap material. - Referring now to FIG. 7, the ejection of
brake lining material 10 frommold assembly 20 is disclosed. Due to the unique construction ofmold assembly 20, the typical ejector pins for the mold assembly are not required. Instead, the ejection ofbrake lining material 10 frommold assembly 20 is accomplished by first removingcover 26 and then exerting a force on the upper surface ofmold frame 24.Mold frame 24 will slide downward alongmold base 22 collapsing the plurality of conical springs 34. The plurality ofconical springs 34 are able to collapse to a height equal to the diameter of the wire of the springs. Thus, by having the height ofplatform 32 greater than the height of the mold frame plus the collapsed dimension ofsprings 34, ejection ofbrake lining material 10 frommold cavity 28 can be accomplished by the movement ofmold frame 24 alongmold base 22 as shown in FIG. 7.Material 10 is removed frommold assembly 20 and the above process repeats itself for continued production of brake lining material. - While
mold assembly 20 has been illustrated and described using the plurality ofconical springs 34, it is within the scope of the present invention to utilize any of the other types of compression springs. The requirement for ejection of the brake lining material is that the height ofplatform 32 must be sufficient formold frame 24 to slide along such thatplatform 32 extends level with or above the upper surface ofmold frame 24 to eject the brake lining material. - While the above detailed description describes the preferred embodiment of the present invention, it should be understood that the present invention is susceptible to modification, variation and alteration without deviating from the scope and fair meaning of the subjoined claims.
Claims (11)
1. A mold assembly comprising:
a mold base;
a mold frame slidingly received on said mold base, said mold base and said mold frame defining a mold cavity;
a plurality of springs disposed between said mold base and said mold frame;
a mold cover engaging said mold frame, said mold cover closing said mold cavity, said mold cavity having a variable volume due to said mold frame sliding with respect to said mold base.
2. The mold assembly according to claim 1 wherein said plurality of springs are conical springs.
3. The mold assembly according to claim 1 wherein said mold base comprises a support structure and a platform, said mold frame being slidingly received on said platform.
4. The mold assembly according to claim 3 wherein said plurality of springs are disposed between said support structure and said mold frame.
5. The mold assembly according to claim 3 wherein said platform defines a first height and said mold frame defines a second height, said first height being greater than said second height such that a sliding movement of said mold frame with respect to said platform ejects a molded article.
6. The mold assembly according to claim 5 wherein said plurality of springs are conical springs.
7. A method of producing a sheet of brake lining material in a mold having a mold base and a mold frame, said method comprising the steps of:
placing a pre-specified amount of brake lining material within a mold cavity having a volume defined by said mold base and said mold frame;
forming said pre-specified volume of brake lining material within said mold cavity such that said brake lining material fills said cavity;
adjusting said volume of said mold cavity to equal said volume of said pre-specified amount of brake lining material to produce said sheet of brake lining material.
8. The method according to claim 7 wherein said mold cavity defines a height and said step of adjusting said volume adjusts said height of said mold.
9. The method according to claim 7 wherein said step of adjusting said volume moves said mold frame with respect to said mold base.
10. The method according to claim 7 further comprising the step of ejecting said sheet of brake lining material from said mold cavity.
11. The method according to claim 10 wherein said step of ejecting said sheet of brake lining material moves said mold frame with respect to said mold base.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/685,050 US20040081720A1 (en) | 1999-04-02 | 2003-10-14 | Method and apparatus for producing brake lining material |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US09/286,088 US6669891B1 (en) | 1999-04-02 | 1999-04-02 | Method and apparatus for producing brake lining material |
US10/685,050 US20040081720A1 (en) | 1999-04-02 | 2003-10-14 | Method and apparatus for producing brake lining material |
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US09/286,088 Division US6669891B1 (en) | 1999-04-02 | 1999-04-02 | Method and apparatus for producing brake lining material |
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US20040081720A1 true US20040081720A1 (en) | 2004-04-29 |
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US09/286,088 Expired - Fee Related US6669891B1 (en) | 1999-04-02 | 1999-04-02 | Method and apparatus for producing brake lining material |
US10/685,050 Abandoned US20040081720A1 (en) | 1999-04-02 | 2003-10-14 | Method and apparatus for producing brake lining material |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US09/286,088 Expired - Fee Related US6669891B1 (en) | 1999-04-02 | 1999-04-02 | Method and apparatus for producing brake lining material |
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US (2) | US6669891B1 (en) |
Cited By (3)
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CN103496074A (en) * | 2013-07-15 | 2014-01-08 | 辽宁九通摩擦材料有限公司 | Three-opening flat-bottom cold stamping die for friction materials |
CN108705803A (en) * | 2018-05-16 | 2018-10-26 | 烟台博海木工机械有限公司 | A kind of mechanical extruder |
CN111618295A (en) * | 2020-06-04 | 2020-09-04 | 太原红日强磁材有限公司 | Positive displacement weighing and distributing device and distributing method thereof |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030030185A1 (en) * | 2000-11-06 | 2003-02-13 | Gemberling George J. | Compression molding apparatus and method |
ES2278512B2 (en) * | 2005-07-29 | 2008-05-01 | Manuel Lopez Sanchez | Tray for producing hardboard panels for doors by hot pressing, has base with variable height side walls containing retractable parts |
WO2007012686A2 (en) * | 2005-07-29 | 2007-02-01 | Lopez Sanchez Manuel | Tray for the production of hardboards for doors, comprising cavities for panelling or glazing |
Citations (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2057466A (en) * | 1934-06-16 | 1936-10-13 | Hartford Empire Co | Method of and apparatus for molding refractory blocks and the like |
US2913766A (en) * | 1957-02-11 | 1959-11-24 | Haller John | Briquetting die set |
US3534439A (en) * | 1965-04-13 | 1970-10-20 | Werz Furnier Sperrholz | Molding apparatus |
US3632276A (en) * | 1969-04-28 | 1972-01-04 | Werz Furnier Sperrholz | Mold for producing molded elements with parts of different thicknesses from fibrous mixtures |
US3881982A (en) * | 1971-04-30 | 1975-05-06 | Friedman Leonard | Method for bonding brake linings |
US4008517A (en) * | 1973-06-28 | 1977-02-22 | Rockwell International Corporation | Brake drum and method of manufacture |
US4128370A (en) * | 1977-05-12 | 1978-12-05 | Fred M. Dellorfano, Jr. And Donald P. Massa, Trustees, The Stoneleigh Trust | Manufacture of electroacoustic transducers which require molding an elastomer to the surface of the transducer material |
US4157887A (en) * | 1977-06-24 | 1979-06-12 | Gebruder Netzsch, Maschinenfabrik Gmbh & Co. | Pressing die for producing ceramic moulds from a pulverulent mass |
US4531276A (en) * | 1982-06-07 | 1985-07-30 | General Motors Corporation | Method of making a drum brake shoe and lining assembly |
US4573249A (en) * | 1983-10-05 | 1986-03-04 | General Motors Corporation | Method of manufacturing brake shoe assembly |
US4755128A (en) * | 1986-09-30 | 1988-07-05 | Peerless Machine & Tool Corporation | Apparatus for releasing a press-formed article from a die set |
US4860570A (en) * | 1987-02-02 | 1989-08-29 | Whipple Patent Management Corporation | Low tonnage high quality thread stamping |
US4900240A (en) * | 1987-12-15 | 1990-02-13 | Ing. Johann Leinweber Anstalt Fur Mechanik | Apparatus for pressing curved brake linings, especially for drum-type brakes |
US5003809A (en) * | 1989-05-02 | 1991-04-02 | Mitsuba Electric Mfg. Co., Ltd. | Method of mounting and demounting molds to and from press molding machine |
US5024811A (en) * | 1989-06-15 | 1991-06-18 | Mannesmann Aktiengesllschaft | Method for manufacturing dimensionally correct compacts |
US5044925A (en) * | 1988-09-05 | 1991-09-03 | Fuji Photo Film Co., Ltd. | Injection-compression mold |
US5174146A (en) * | 1990-04-03 | 1992-12-29 | Sollac | Method and device for forming a part in relief on a sheet metal blank |
US5204127A (en) * | 1991-05-10 | 1993-04-20 | Composite Products, Inc. | Compression molding apparatus |
US5310330A (en) * | 1991-04-23 | 1994-05-10 | Krauss-Maffei Aktiengesellschaft | System for molding laminated articles of a thermoplastic resin |
US5621958A (en) * | 1995-01-31 | 1997-04-22 | Woodcox; Gordon G. | Brake element processing device and method |
US6003339A (en) * | 1992-06-02 | 1999-12-21 | Sumitomo Heavy Industries, Ltd. | Glass compression molding machine and machining chamber therefor |
US6007317A (en) * | 1997-07-23 | 1999-12-28 | Micron Technology, Inc. | Ball grid array (BGA) encapsulation mold |
US6824722B1 (en) * | 1998-08-18 | 2004-11-30 | Saint-Gobain Vitrage | Process for fashioning superposed extrudate |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5692040A (en) * | 1979-12-26 | 1981-07-25 | Akebono Brake Ind Co Ltd | High-temperature compression molds for friction pad |
-
1999
- 1999-04-02 US US09/286,088 patent/US6669891B1/en not_active Expired - Fee Related
-
2003
- 2003-10-14 US US10/685,050 patent/US20040081720A1/en not_active Abandoned
Patent Citations (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2057466A (en) * | 1934-06-16 | 1936-10-13 | Hartford Empire Co | Method of and apparatus for molding refractory blocks and the like |
US2913766A (en) * | 1957-02-11 | 1959-11-24 | Haller John | Briquetting die set |
US3534439A (en) * | 1965-04-13 | 1970-10-20 | Werz Furnier Sperrholz | Molding apparatus |
US3632276A (en) * | 1969-04-28 | 1972-01-04 | Werz Furnier Sperrholz | Mold for producing molded elements with parts of different thicknesses from fibrous mixtures |
US3881982A (en) * | 1971-04-30 | 1975-05-06 | Friedman Leonard | Method for bonding brake linings |
US4008517A (en) * | 1973-06-28 | 1977-02-22 | Rockwell International Corporation | Brake drum and method of manufacture |
US4128370A (en) * | 1977-05-12 | 1978-12-05 | Fred M. Dellorfano, Jr. And Donald P. Massa, Trustees, The Stoneleigh Trust | Manufacture of electroacoustic transducers which require molding an elastomer to the surface of the transducer material |
US4157887A (en) * | 1977-06-24 | 1979-06-12 | Gebruder Netzsch, Maschinenfabrik Gmbh & Co. | Pressing die for producing ceramic moulds from a pulverulent mass |
US4531276A (en) * | 1982-06-07 | 1985-07-30 | General Motors Corporation | Method of making a drum brake shoe and lining assembly |
US4573249A (en) * | 1983-10-05 | 1986-03-04 | General Motors Corporation | Method of manufacturing brake shoe assembly |
US4755128A (en) * | 1986-09-30 | 1988-07-05 | Peerless Machine & Tool Corporation | Apparatus for releasing a press-formed article from a die set |
US4860570A (en) * | 1987-02-02 | 1989-08-29 | Whipple Patent Management Corporation | Low tonnage high quality thread stamping |
US4900240A (en) * | 1987-12-15 | 1990-02-13 | Ing. Johann Leinweber Anstalt Fur Mechanik | Apparatus for pressing curved brake linings, especially for drum-type brakes |
US5044925A (en) * | 1988-09-05 | 1991-09-03 | Fuji Photo Film Co., Ltd. | Injection-compression mold |
US5003809A (en) * | 1989-05-02 | 1991-04-02 | Mitsuba Electric Mfg. Co., Ltd. | Method of mounting and demounting molds to and from press molding machine |
US5024811A (en) * | 1989-06-15 | 1991-06-18 | Mannesmann Aktiengesllschaft | Method for manufacturing dimensionally correct compacts |
US5174146A (en) * | 1990-04-03 | 1992-12-29 | Sollac | Method and device for forming a part in relief on a sheet metal blank |
US5310330A (en) * | 1991-04-23 | 1994-05-10 | Krauss-Maffei Aktiengesellschaft | System for molding laminated articles of a thermoplastic resin |
US5204127A (en) * | 1991-05-10 | 1993-04-20 | Composite Products, Inc. | Compression molding apparatus |
US6003339A (en) * | 1992-06-02 | 1999-12-21 | Sumitomo Heavy Industries, Ltd. | Glass compression molding machine and machining chamber therefor |
US5621958A (en) * | 1995-01-31 | 1997-04-22 | Woodcox; Gordon G. | Brake element processing device and method |
US6007317A (en) * | 1997-07-23 | 1999-12-28 | Micron Technology, Inc. | Ball grid array (BGA) encapsulation mold |
US6824722B1 (en) * | 1998-08-18 | 2004-11-30 | Saint-Gobain Vitrage | Process for fashioning superposed extrudate |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103496074A (en) * | 2013-07-15 | 2014-01-08 | 辽宁九通摩擦材料有限公司 | Three-opening flat-bottom cold stamping die for friction materials |
CN108705803A (en) * | 2018-05-16 | 2018-10-26 | 烟台博海木工机械有限公司 | A kind of mechanical extruder |
CN111618295A (en) * | 2020-06-04 | 2020-09-04 | 太原红日强磁材有限公司 | Positive displacement weighing and distributing device and distributing method thereof |
Also Published As
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Legal Events
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE |