WO1990000452A1 - Rotary hammering machine - Google Patents
Rotary hammering machine Download PDFInfo
- Publication number
- WO1990000452A1 WO1990000452A1 PCT/EP1989/000772 EP8900772W WO9000452A1 WO 1990000452 A1 WO1990000452 A1 WO 1990000452A1 EP 8900772 W EP8900772 W EP 8900772W WO 9000452 A1 WO9000452 A1 WO 9000452A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rolling members
- shaft
- hammering
- members
- cage
- Prior art date
Links
- 238000005096 rolling process Methods 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000000750 progressive effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- IJJWOSAXNHWBPR-HUBLWGQQSA-N 5-[(3as,4s,6ar)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-n-(6-hydrazinyl-6-oxohexyl)pentanamide Chemical compound N1C(=O)N[C@@H]2[C@H](CCCCC(=O)NCCCCCC(=O)NN)SC[C@@H]21 IJJWOSAXNHWBPR-HUBLWGQQSA-N 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
- B21J7/02—Special design or construction
- B21J7/14—Forging machines working with several hammers
- B21J7/16—Forging machines working with several hammers in rotary arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The machine includes a support structure (1) defining a circular seat (2) in which a shaft (20) is coaxially rotatable. The shaft (20) has radial passages (21) in which respective hammering tools (22, 23) are slidable. An annular cage (16) is mounted around the shaft (20) and carries a plurality of rotatable rolling members (17) which project radially from the inner surface of the cage (16). These rolling members (17) are bi-conical rollers which can cooperate with the hammering tools (22, 23) to impart to them a radial hammering movement as a result of relative rotation of the shaft (20) and the cage (16). Two annular thrust members (3, 4) with conical inner surfaces (3a, 4a) surround the rolling members (17) and are movable axially in opposite directions so as to exert a radial thrust on the rolling members (17) towards the shaft (20), thus causing a corresponding radial movement of the hammering tools (22, 23) towards each other.
Description
ROTARY HAMMERING MACHINE
The present invention relates to a rotary hammering machine comprising
a support structure defining a circular seat,
a shaft mounted coaxially in the seat and in which there are formed at least two radial passages in which respective hammering tools are slidable, the tools having respective shaped ends for deforming plastically a body interposed between them; and
an annular cage mounted in the seat around the shaft and carrying a plurality of rotatable rolling members which project radially from the inner surface of the cage; the rolling members being arranged to impart a radial hammering movement to the hammering tools as a result of relative rotation of the shaft and the cage.
It is known that rotary hammering is a mechanical operation which enables the section of bars and tubes to be reduced by plastic, deformation of such bodies, at substantially constant volume, without the removal of shavings.
Conventional rotary hammering machines allow substantially two different types of operation.
A first method enables the production of progressively tapered pieces, with successive cylindrical portions of gradually reduced diameters, which portions are connected by intermediate frusto-coniσal portions. In this method of operation, the piece being worked is inserted between the hammering tools and is advanced progressively, axially.
In a second method of operation it is possible to form cuts or annular grooves and, in general, profiles with undercut parts. In this second method of operation, the piece to be worked is clamped between the hammers and held axially stationary during the rotation of the hammers.
In rotary hammering machines,, the hammering tools usually include two parts:
a first part (or hammer proper) cooperates with the rolling, members of the cage and a second part (or "die") receives the thrust from the first and is shaped according to the form which is to be imparted to the pieces being worked.
In use, the hammering dies are subject to wear which is compensated for by the insertion and successive addition of spacers between each hammer and the associated die. This operation for recovering the wear of the dies does not lend itself to being carried out automatically so that it is necessary to stop the operation frequently.
For machines intended to form cuts or grooves without the advance of the piece, it has been proposed "to recover the wear of the dies by inserting wedges, which are movable axially in directions parallel to the axis of the shaft, between the hammers and the dies instead of the usual intermediate spaces. These wedges, with their flat inclined faces, cause each hammer and its associated die to be move apart progressively and, specifically, cause the die to move radially towards the shaft to compensate for the wear.
This system is not, however, satisfactory: the wedges
inserted between the hammers and the dies tend to exert an axial thrust (even more considerable) as well as a radial thrust, with all the harmful effects that this involves.
Moreover, it has also been found rather difficult to achieve the progressive insertion of the wedges between the hammers and the dies in a controlled manner.
A consequence of these disadvantages is that rotary hammering machines for working without advancement of the piece and with progressive and controlled take-up of the wear of the dies have not yet been put on the market.
This has meant that up to now it has been necessary to use turning machines to work such pieces, such machines operating with tools which remove shavings with a consequent reduction in the structural strength of the pieces worked and the consequent loss of material due to the waste.
The object of the present invention is, therefore, to provide a rotary hammering machine which effectively enables the dies to be advanced automatically, in a progressive and controlled manner, while avoiding, in particular, the disadvantages of the prior-art wedge solutions described above.
This object is achieved according to the invention by means of a rotary hammering machine of the type specified at the beginning of the present description, the main characteristic of which lies in the fact that the rolling members each define two conical surfaces which taper in opposite directions and the ends of the
hammering tools which cooperate with these rolling members having corresponding surfaces with respective longitudinal profiles which are inclined like the generatrices of the conical surfaces; and in that at least two thrust members are provided which cooperate with the radially outermost portions of the rolling members and are movable simultaneously and axially in opposite directions so as to exert a radial thrust on the rolling members towards the shaft.
According to a further characteristic, the conical surfaces of the rolling members have the same taper. These rolling members are, in particular, bi-conical rollers.
In one embodiment, the thrust members are annular with inner conical surfaces in contact with the radially outermost portions of the rolling members.
Further characteristics and advantages of the invention will become apparent from the detailed description which follows, given with reference to the appended drawings, provided purely by way of non-limiting example, in which:
Figure 1 is an axial sectional view of a machine according to the invention, and
Figure 2 is a cross-section taken on the line II-II of Figure 1.
With reference to the drawings, a rotary hammering machine according to the invention includes a support structure 1 which defines a circular, cylindrical seat> 2 whose axis A-A is arranged horizontally.
Within the seat 2 are two rings 3 and 4 with frusto-conical inner surfaces 3a and 4a of substantially the same dimensions and, in particular, with the same taper. More particularly, these surfaces lie on cones which taper in opposite directions.
In the embodiment illustrated, each ring 3, 4 has a series of three threaded through-holes 5 which are equiangularly spaced and alternated with another three through-holes 6 with smooth walls.
Three rods (only one of which is visible in Figure 1, at the top) are indicated 8. and each has a threaded end portion 8a which extends into a correspondingly- threaded aperture 5 in the ring 3 and a smooth portion 8b guided in a smooth hole 6 in the ring 4.
Similarly, a further three rods (of which only one is visible in Figure 1, at the bottom) are indicated 9 and each has a smooth portion 9a, which extends into a smooth hole 6 in the ring 3, and a threaded portion 9b which engages a correspondingly threaded hole 5 in the ring 4.
The corresponding ends of the rods 8 and 9 carry respective sprockets 10 and 11 (Figure 1) which mesh with a gear 12 of a transmission device 13. This device includes a further gear 14 with helical teeth which meshes with a worm screw 15. This worm screw is connected to a drive motor (not illustrated).
In operation, the transmission 13 driven by the worm screw 15 causes the simultaneous rotation of the rods 8 and 9 in the same sense and, as a result of the threaded coupling of the rods with the rings 3 and 4,
it is possible , in particular , to cause the rings to move one towards the other in a controlled and progressive manner.
Within the rings 3 and 4 is an annular cage , indicated 16 in Figure 2 , which carries a plurality of idle rollers 17. These rollers project radially from the inner surface of the cage 16 through corresponding slots 18 in the cage. As is seen in particular from Figure 2 , each roller 17 has two end portions 18 and 19 of frusto-conical form with the same taper, whose profiles roll on the frusto-conical inner surfaces of the rings 3 and 4 respectively .
A rotatable shaft 20 is mounted coaxially inside the cage 17. The outer diameter of the shaft 20 is less than the inner diameter of the cage and, moreover , the outer surface of the shaft extends at a certain distance from the radially-innermost portions of the rollers 17.
In the embodiment illustrated, the shaft 20 is formed with a diametral slot 21 in which two dies 22 and associated hammers 23 , which are radially outermost, are radially slidable.
As seen in particular in Figure 1 , the facing surfaces of the dies 22 have respective shaped surfaces 22a arranged in dependence on the shape to be given to a piece to be worked.
The hammers 23 project from the outer surface of the shaft 20 and each have two surfaces 24 and 25 (see in particular Figure 1) which are inclined to the axis A-A
like the radially innermost generatrices of the conical surfaces 18 and 19 of the rollers 17.
In use, a cylindrical member to be worked, which may be solid or tubular, is inserted between the dies 22. The shaft 20 is then rotated (by means of a motor not illustrated), Each time the hammers 23 interfere with a pair of rollers 17 carried by the cage 16, the hammers apply an impulsive force to the associated dies which, correspondingly, deform radially the piece being worked. As the working proceeds, the worm screw 15 is rotated progressively by a control system (not illustrated) and this causes the rings 3 and 4 to move towards each other. Bach of these rings consequently exerts a radial thrust on the rollers 17 towards the axis A-A of rotation and an axial stress which is, however, compensated for by the equal and opposite axial stress imparted to the rollers 17 by the other ring.
It follows that the mutual approach of the rings 3 and 4 causes a force to be applied to the rollers 17 solely- in the radial sense whereby these gradually move the opposing dies together as working progresses, achieving the necessary recovery for wear.
The advance of the dies 22 may be controlled with micrometric precision through the drive system for the rings 3 and 4 described above.
Alternatively, the movement of the rings 3 and 4 may be driven by other devices, for example of hydraulic or pneumatic type.
In the embodiment illustrated, the moving together of
the dies is achieved by means of the progressive moving together of the rings 3 and 4. It is however obvious that the machine may be arranged so that the moving together of the dies is a consequence of the moving apart of the two drive rings.
It is also clear that the invention should not beunderstood as limited to hammering machines with only two hammering tools.
Furthermore the member to be worked may be held axially stationary or may be axially advanced.
Claims
1. A rotary hammering machine comprising
a support structure (1) defining a circular seat (2) a shaft (20) mounted coaxially in the seat (2) and having radial passages (21) in which at least two hammering tools (22, 23) are slidable, the tools having respective shaped ends (22a) for deforming plastically a body interposed between them, and
an annular cage (3) mounted in the seat (2) around the shaft (20) and carrying a plurality of rotatable, rolling members (17) which project radially from the inner surface of the cage (3); the rolling members (17) being arranged to impart a radial hammering movement to the hammering tools (22, 23) as a result of relative rotation of the shaft (2) and the cage;
characterised in that
the rolling members (17) each have two conical surfaces (18, 19) which taper in opposite directions, and the ends (23) of the hammering tools (22, 23) which cooperate with the rolling members (17) have corresponding contact surfaces (24, 25) with respective longitudinal profiles which are inclined like the generatrices of the conical surfaces (18, 19), and
in that at least two thrust members (3, 4) are provided which cooperate with the radially outermost portions of the rolling members (17, 18, 19) and which are movable simultaneously and axially in opposite directions so as to exert a radial thrust on the rolling members (17) towards the shaft (20).
2. A machine according to Claim 1, characterised in that the two conical surfaces (18, 19) defined by the rolling members (17) have the same taper.
3. A machine according to Claim 2, characterised in that the rolling members (17-19) are bi-conical rollers.
4. A machine according to Claim 1, characterised in that the thrust members (3, 4) are in the form of rings and have respective inner conical surfaces (3, 4a) in contact with the radially outermost portions of the rolling members (17-19).
5. A machine according to Claim 4, characterised in that it further includes drive means (8-15) for causing the controlled sliding of the annular thrust members (3, 4) in opposite directions.
6. A machine according to Claim 5, characterised in that it includes first and second pluralities of threaded rods (8, 9) which engage correspondingly-threaded axial holes (5) in the annular thrust members (3, 4); the rods (8, 9) carrying respective end sprockets (10, 11) rotatable by means of gear transmission devices (12-15).
7. A machine according to any one of Claims 1 to 5, characterised in that the drive means include hydraulic or pneumatic devices.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT84608-A/88 | 1988-07-06 | ||
IT8884608A IT8884608A0 (en) | 1988-07-06 | 1988-07-06 | HAMMERING MACHINE WITH AUTOMATIC ADVANCEMENT OF THE FORMING DIES, IN ORDER TO OBTAIN INTERMEDIATE TAPERS, UNDERCUT FITTINGS AND UNLOADING GROOVES ON THE PIECE BEING PROCESSED |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990000452A1 true WO1990000452A1 (en) | 1990-01-25 |
Family
ID=11325273
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1989/000772 WO1990000452A1 (en) | 1988-07-06 | 1989-07-05 | Rotary hammering machine |
Country Status (4)
Country | Link |
---|---|
AU (1) | AU3875889A (en) |
ES (1) | ES2014731A6 (en) |
IT (1) | IT8884608A0 (en) |
WO (1) | WO1990000452A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5632791A (en) * | 1994-12-06 | 1997-05-27 | Bha Group, Inc. | Unitary filter cartridge |
USRE37163E1 (en) | 1994-05-06 | 2001-05-08 | Bha Group Holdings, Inc. | Unitary filter cartridge |
US6726735B1 (en) | 1994-05-06 | 2004-04-27 | Bha Group Holdings, Inc. | Unitary filter cartridge |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU34414A1 (en) * | ||||
US1430974A (en) * | 1920-07-19 | 1922-10-03 | Frick William | Swaging machine |
DE411774C (en) * | 1925-04-06 | Nikolaus Horvat | Forging machine | |
US1943089A (en) * | 1930-07-12 | 1934-01-09 | Budd Wheel Co | Brake drum swaging machine |
DE1043758B (en) * | 1957-04-15 | 1958-11-13 | Miloslav Zak | Round forging machine |
-
1988
- 1988-07-06 IT IT8884608A patent/IT8884608A0/en unknown
-
1989
- 1989-07-05 WO PCT/EP1989/000772 patent/WO1990000452A1/en unknown
- 1989-07-05 AU AU38758/89A patent/AU3875889A/en not_active Abandoned
- 1989-07-05 ES ES8902372A patent/ES2014731A6/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU34414A1 (en) * | ||||
DE411774C (en) * | 1925-04-06 | Nikolaus Horvat | Forging machine | |
US1430974A (en) * | 1920-07-19 | 1922-10-03 | Frick William | Swaging machine |
US1943089A (en) * | 1930-07-12 | 1934-01-09 | Budd Wheel Co | Brake drum swaging machine |
DE1043758B (en) * | 1957-04-15 | 1958-11-13 | Miloslav Zak | Round forging machine |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5885314A (en) * | 1994-05-06 | 1999-03-23 | Bha Group Holdings, Inc. | Unitary filter cartridge |
USRE37163E1 (en) | 1994-05-06 | 2001-05-08 | Bha Group Holdings, Inc. | Unitary filter cartridge |
US6726735B1 (en) | 1994-05-06 | 2004-04-27 | Bha Group Holdings, Inc. | Unitary filter cartridge |
US5632791A (en) * | 1994-12-06 | 1997-05-27 | Bha Group, Inc. | Unitary filter cartridge |
Also Published As
Publication number | Publication date |
---|---|
ES2014731A6 (en) | 1990-07-16 |
IT8884608A0 (en) | 1988-07-06 |
AU3875889A (en) | 1990-02-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0605916B1 (en) | A method of manufacturing a torque transmitting housing | |
CN104395008B (en) | For the method and apparatus that workpiece is reshaped | |
KR100560075B1 (en) | Rack Shaft Manufacturing Method and Apparatus | |
EP1108483B1 (en) | Method and device for flow-turning | |
US5894753A (en) | Method of producing splines on a shaft | |
EP0921879B1 (en) | Process and device for manufacturing a gear part with outer teeth | |
DE19526900B4 (en) | Method for the combined machining and forming of rings and machines for this purpose | |
CA1172878A (en) | Method and tool for the cold forging of internally profiled tubes | |
EP0133765A2 (en) | Making rings from tube or bar stock | |
EP1656225B1 (en) | Method for producing internally or externally profiled rings and arrangement therefor | |
EP0955110B1 (en) | Method and device for flow-turning | |
EP1356891A1 (en) | Method of manufacturing sliding sleeves for gear boxes | |
US3345845A (en) | Profiling methods and machines | |
WO1990000452A1 (en) | Rotary hammering machine | |
CN104540611A (en) | Helical spline forming | |
US5594988A (en) | Method of making a wheel rim | |
EP3025802B1 (en) | Device and method for pressure rolling workpieces | |
US4705150A (en) | Method and machine for splining clutch hubs with close tolerance spline bellmouth and oil seal surface roundness | |
EP0808678A1 (en) | Method and apparatus for making a poly-v-pulley | |
DE3401595C2 (en) | ||
EP3331783B1 (en) | Conveyor pulley and process for producing a roller tube | |
EP0127997B1 (en) | Method and machine for splining clutch hubs with close tolerance spline bellmouth and oil seal surface roundness | |
US4918961A (en) | Machine for splining clutch hubs with close tolerance spline bellmouth and oil seal surface roundness | |
DE19710730B4 (en) | Rolling process and two-roll profile rolling machine for producing pitch profiles with an odd number of turns on rotationally symmetrical workpieces | |
DE19849182A1 (en) | Rolling of annular workpieces takes place at least in two stages, with predominantly axial and tangential material flows of the blank produced respectively at the first and second stages |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AU BR JP KR SU US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LU NL SE |