US20060042343A1 - Method and device for the production of a tubular workpiece, particularly a shock absorber piston rod, and such a workpiece - Google Patents
Method and device for the production of a tubular workpiece, particularly a shock absorber piston rod, and such a workpiece Download PDFInfo
- Publication number
- US20060042343A1 US20060042343A1 US10/528,929 US52892905A US2006042343A1 US 20060042343 A1 US20060042343 A1 US 20060042343A1 US 52892905 A US52892905 A US 52892905A US 2006042343 A1 US2006042343 A1 US 2006042343A1
- Authority
- US
- United States
- Prior art keywords
- workpiece
- forming
- area
- orbital
- initial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000006096 absorbing agent Substances 0.000 title abstract description 15
- 230000035939 shock Effects 0.000 title description 3
- 230000007704 transition Effects 0.000 claims abstract description 22
- 238000005242 forging Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 4
- 230000003313 weakening effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000013067 intermediate product Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000024287 Areas Species 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/06—Making machine elements axles or shafts
- B21K1/10—Making machine elements axles or shafts of cylindrical form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K21/00—Making hollow articles not covered by a single preceding sub-group
- B21K21/12—Shaping end portions of hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/02—Special design or construction
- B21J9/025—Special design or construction with rolling or wobbling dies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3221—Constructional features of piston rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2226/00—Manufacturing; Treatments
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Forging (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention describes a method for producing a tubular workpiece, especially a shock-absorber piston rod, wherein, starting out from a tubular initial workpiece (3), a first area (3 a) of the initial workpiece (3) is reduced in a first step by a radial forming process for reducing its outer diameter, and a transition area (3 c), extending at an angle relative to the longitudinal axis (A) of the tubular initial workpiece (3), is formed, said transition area (3 c) extending between said first area (3 a) of the initial workpiece (3) having the reduced diameter and a non-reduced second area (3 b) following the transition area (3 c), characterized in that in a second process step, following the first process step.
It is provided according to the transition area (3 c) of the initial workpiece (3) is cold-formed to obtain the substantially rectangular shoulder (2) of the workpiece (1).
Description
- The present invention relates to a method for producing a tubular workpiece, especially a shock-absorber piston rod, wherein, starting out from a tubular initial workpiece, a first area of the initial workpiece is reduced in, a first step by a radial forming process for reducing its outer diameter, and a transition area, extending at an angle relative to the longitudinal axis of the tubular initial workpiece, is formed, the transition area extending between the first area of the tubular initial workpiece having the reduced diameter and a non-reduced second area following the transition area, and to a workpiece of that kind and a device for producing such a workpiece.
- A method of that kind is known and is used for producing cold-formed workpieces, for example a shock-absorber piston rod. Such shock-absorber piston rods are employed especially in certain front-axle designs of motor vehicles where the shock absorber has to fulfill a wheel-guiding function too. The shock-absorber piston rod then needs to be given a larger diameter, and for weight-saving purposes these rods are then made from a tubular material and are thereby hollow.
- The design of the known shock-absorber piston rod exhibits, at a spacing from the upper end near the car body, a substantially rectangular shoulder that serves to mount the shock absorber of the vehicle. In the case of the known piston rods, which are cold-formed by rotary swaging, the shoulder is formed by initially reducing the body-end portion of the initial tube and then forming the transition area to that portion of the tube, which was not subjected to the rotary swaging operation and which still exhibits the initial diameter of the initial workpiece, with an angle of 45°. This is necessary in order to keep the wall thickness of the initial tube of the shock-absorber piston rod substantially constant so as to not weaken the wall of the workpiece. Considering, however, that the final shock-absorber piston rod has got to exhibit a rectangular shoulder at this point, i.e. an adaptor sleeve that comprises an abutment surface extending at a right angle relative to the longitudinal axis of the piston rod is pressed on said transition area that extends at an angle of approximately 45° relative to the longitudinal axis of the piston rod.
- Such an adaptor sleeve constitutes an extra part which results in additional production and assembly costs. In addition, close fit tolerances must be maintained in this case in order to guarantee the exact position of the adaptor sleeve on the piston rod.
- Now, it is the object of the present invention to improve a method for producing a workpiece, especially a shock-absorber piston rod, and a workpiece of the aforementioned kind, so that a workpiece comprising a substantially rectangular shoulder can be produced from a tube in a simple way without the use of an adaptor sleeve.
- The invention achieves this object by a second process step, following the first process step, in which the transition area of the initial workpiece is cold-formed to obtain a substantially rectangular shoulder.
- The features according to the invention provide a favorable way of producing, in a simple way and solely by cold-forming steps, a tubular workpiece with a substantially rectangular shoulder, especially a shock-absorber piston rod, from a tubular initial workpiece. Due to the fact that the rectangular shoulder can be produced directly by the method of the invention, using an adaptor sleeve, which is costly in terms of production and assembly, is therefore no longer necessary for the production of a workpiece made according to the method of the invention, which advantageously reduces its production costs as a whole.
- Cold forming the initial workpiece to the final product, which now advantageously consists of a single piece, provides the advantage that no, or only a slight weakening of the wall of the initial workpiece occurs.
- According to an advantageous further development of the invention, the forming operation of the second step is an orbital forming operation, effected especially by at least one of a circular movement and a tilting movement, or an axial pressing operation.
- Other advantageous further developments of the invention are the subject-matter of the depending claims.
- Further details and advantages of the invention will become apparent from the exemplary embodiment that will be described hereafter with reference to the drawings in which:
-
FIG. 1 shows one embodiment of a tubular workpiece after a first process step; -
FIG. 2 shows the workpiece ofFIG. 1 after the second process step; and -
FIGS. 3 and 4 show one embodiment of a device for producing a workpiece. - In order to arrive at the intermediate product, illustrated in
FIG. 1 , of the production process of a workpiece, indicated byreference numeral 1, theworkpiece 1 having arectangular shoulder 2, the upper area of a tubularinitial workpiece 3 is first reduced by a cold-forming process, for example a rotary swaging process, which is known as such and which, therefore, will not be described herein in more detail, whereby thatfirst area 3 a of the tubularinitial workpiece 3 is reduced to a smaller diameter than a non-reducedsecond area 3 b. Preferably, atransition area 3 c between the first and thesecond areass initial workpiece 3. - As is readily apparent from
FIG. 1 , thewall 5 of the tubularinitial workpiece 3, part of which is shown in cross-section, is reduced by the cold-forming process either not at all or only insignificantly, so that no weakening of the material of theinitial workpiece 3 occurs in thetransition area 3 c. Now, in order to convert that intermediate product into the final product illustrated inFIG. 2 , i.e. thetubular workpiece 1 with the substantiallyrectangular shoulder 2, the invention provides to subject thetransition area 3 c to a forming operation, especially an orbital forging or axial pressing operation. The orbital forging operation may conveniently be performed by employing an orbital forging process using a circular movement, a tilting movement or a combined circular and tilting movement of a corresponding die. Forming methods of that kind are known to the person skilled in the art and will therefore not be described herein in more detail. - As it can be seen from the representation of the
wall 5 of the tubularinitial workpiece 3, no weakening of thewall 5 in the area of theshoulder 2 occurs in this case, either. - The method is advantageously and especially well suited for the production of a shock-absorber piston rod with a rectangular shoulder. In addition to such shock-absorber piston rods, the invention also lends itself to producing other workpieces, which need to have a rectangular or a substantially shoulder, from a tubular initial workpiece in a single piece.
-
FIGS. 3 and 4 now show one embodiment of a device, indicated generally byreference numeral 10, for producing theworkpiece 1 with a substantiallyrectangular shoulder 2. For carrying out the first process step mentioned above, namely for producing thetransition area 3 c between the first and thesecond areas initial workpiece 3, thedevice 10 comprises a reducingunit 11 designed in this case as a rotary swaging tool with a plurality of rotary swaging dies 12. The rotary swaging dies 12 act upon theinitial workpiece 3 in radial direction R. Each rotary swaging die comprises an inclined formingsurface 13, the inclination of which relative to the longitudinal axis A of theinitial workpiece 3 is again approximately equal to 45°, corresponding substantially to the inclination of the inclined surface of thetransition area 3 c to be produced. - Once the
inclined transition area 3 c has been formed by a reducing process known as such, which therefore will not be described herein in more detail, especially by rotary swaging, theinitial workpiece 3 is transferred from the reducingunit 11 of thedevice 10 described above to a further forming unit of thedevice 10, designed in the present case as an orbital formingunit 15, where the second process step is to be carried out. That orbital formingunit 15 comprises anorbital die 16, which performs an orbital movement about a longitudinal axis A, acting upon thetransition area 3 c of theinitial workpiece 3 by itsworking surface 17 until the substantiallyrectangular shoulder 2 has been formed.
Claims (11)
1. Method for producing a tublar workpiece, comprising:
first processing steps of:
reducing a first area of the initial workpiece by a radial forming process for reducing the outer diameter of the workpiece,
forming a transition area, extending at an angle relative to the longitudinal axis of the tubular initial workpiece said transition area extending between said first area of the initial workpiece having the reduced diameter and a non-reduced second area following the transition area
a second process step of:
cold forming the transition area of the initial workpiece is cold to obtain a substantially rectangular shoulder of the workpiece.
2. The method as defined in claim 11 , wherein the orbital forming process of the second process step is an orbital forging or axial pressing process.
3. The method as defined in claim 2 , wherein the orbital forging process is effected by at least one of circular movement and a tilting movement.
4. Workpiece with a substantially rectangular shoulder comprising:
an intial workpiece haing a wall and a shoulder wherein the shoulder is an integral part of the wall of the initial workpiece and the shoulder is produced by cold forming the initial workpiece by a radial forming process, followed by an orbital forging or axial pressing process.
5. Device for producing a tubular workpiece with a substantially rectangular shoulder comprising:
a reducing unit, adapted to form a transistion area in the form of a circumferential inclined surface can be formed in a tubular initial workpiece, and
a forming unit adapted to convert the inclined transition area to a substantially rectangular shoulder of the workpiece by cold forming of the intial workpiece.
6. The device as claimed in claim 5 , wherein the reducing unit of the device comprises at least one forging die.
7. The device as claimed in claim 6 , wherein the at least one forging die comprises an inclined forming surface.
8. The device as claimed in claim 5 , wherein the forming unit of the device is designed as an orbital forming unit.
9. The device as claimed in claim 5 , wherein the forming unit comprises an orbital tool that performs an orbital movement about a longitudinal axis of the initial workpiece.
10. The method as defined in claim 1 , wherein radial forming of the first area is effected by rotary swaging.
11. The method as defined in claim 1 , wherein the cold-forming process of the second process step is an orbital forming process.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10245570.8 | 2002-09-26 | ||
DE10245570A DE10245570B3 (en) | 2002-09-26 | 2002-09-26 | Production of a tubular workpiece, especially a shock absorber piston rod, comprises a second process step in which a transition region is shaped by a deformation process to produce a right-angled shoulder of the workpiece |
PCT/EP2003/010655 WO2004030847A1 (en) | 2002-09-26 | 2003-09-25 | Method and device for the production of a tubular workpiece, particularly a shock absorber piston rod, and such a workpiece |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060042343A1 true US20060042343A1 (en) | 2006-03-02 |
Family
ID=31724850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/528,929 Abandoned US20060042343A1 (en) | 2002-09-26 | 2003-09-25 | Method and device for the production of a tubular workpiece, particularly a shock absorber piston rod, and such a workpiece |
Country Status (9)
Country | Link |
---|---|
US (1) | US20060042343A1 (en) |
EP (1) | EP1542819A1 (en) |
JP (1) | JP2006500222A (en) |
KR (1) | KR20050044932A (en) |
CN (1) | CN1684783A (en) |
AU (1) | AU2003277898A1 (en) |
CA (1) | CA2501080A1 (en) |
DE (1) | DE10245570B3 (en) |
WO (1) | WO2004030847A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103831581A (en) * | 2012-11-23 | 2014-06-04 | 亚柏士气动工具股份有限公司 | Method for manufacturing impacting shaft of air tool and impacting shaft of air tool |
US20170356483A1 (en) * | 2016-06-14 | 2017-12-14 | Lippert Components, Inc. | Cold-worked riveted piston/rod assembly and method of making same |
KR20210097056A (en) * | 2020-01-29 | 2021-08-06 | 대성코리아(주) | Manufacturing method of poison rod for shock absorber |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008037549B3 (en) * | 2008-11-12 | 2009-12-03 | Heinrich Müller Maschinenfabrik GmbH | Thin-walled tubular workpiece e.g. reservoir tube, producing method for shock absorber of vehicle, involves removing punching tool from workpiece that is transformed, and pulling out support mandrel from transformed workpiece |
CN100591944C (en) * | 2008-11-24 | 2010-02-24 | 南阳淅减汽车减振器有限公司 | Production technology of damper piston rod of automobile |
CN102581153A (en) * | 2012-01-06 | 2012-07-18 | 昌河飞机工业(集团)有限责任公司 | Processing method of closed-up pull rod |
CN102581211B (en) * | 2012-02-02 | 2014-08-06 | 哈尔滨飞机工业集团有限责任公司 | Cold forming method for integral aluminum alloy pull rod of aircraft |
CN106964748B (en) * | 2017-03-24 | 2019-04-23 | 常州永茂特种紧固件有限公司 | The processing method and its processing tool of piston rod |
KR102411985B1 (en) * | 2020-02-17 | 2022-06-22 | 양희수 | Manufacturing method piston rod of shock absorber |
CN112170773A (en) * | 2020-08-25 | 2021-01-05 | 福建龙溪轴承(集团)股份有限公司 | Light alloy non-revolving body special-shaped integral pull rod precision forging near-net forming technology |
DE102021103689B3 (en) * | 2021-02-17 | 2022-05-19 | GFU - Maschinenbau GmbH Gesellschaft für Umformung und Maschinenbau | Method for producing a stepped cross-sectional reduction in a one-piece tubular metal workpiece, one-piece tubular workpiece produced therewith and apparatus for carrying out the method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3868842A (en) * | 1971-10-12 | 1975-03-04 | William Edward Anthony | Method of making lap pin |
US5465598A (en) * | 1992-06-12 | 1995-11-14 | Topy Kogyo Kabushiki Kaisha | Method for forming an annular member |
US6230540B1 (en) * | 1999-10-19 | 2001-05-15 | Meritor Heavy Vehicle Systems Llc | Method and apparatus for forming an integral bearing shoulder in a tubular axle |
US6247346B1 (en) * | 1996-12-18 | 2001-06-19 | Alcoa Inc. | Method of forming a drive shaft |
US6276180B1 (en) * | 1997-08-13 | 2001-08-21 | Hirschvogel Umformtechnik Gmbh | Method and apparatus for manufacturing a shift gearwheel and shift gearwheel manufactured by same |
US6792782B2 (en) * | 1999-11-30 | 2004-09-21 | Parker Hannifin Sa | Method for deforming a tube near one of its ends and tool used in this method |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1472860A (en) * | 1974-12-02 | 1977-05-11 | Stevens Bullivant Ltd | Metal-forming |
DE3313273A1 (en) * | 1983-04-13 | 1984-10-18 | Gebrüder Felss, 7535 Königsbach-Stein | Method of reducing tube ends to form pressure-tight spigots |
FR2596481B1 (en) * | 1986-03-27 | 1989-10-27 | Allinquant Sa | PISTON ROD FOR TELESCOPIC APPARATUS SUCH AS SHOCK ABSORBER AND PNEUMATIC SPRING |
FR2801522B1 (en) * | 1999-11-30 | 2002-02-01 | Parker Hannifin Sa | PROCESS FOR DEFORMING A TUBE NEAR ONE OF ITS ENDS AND TOOL USED IN THIS PROCESS |
-
2002
- 2002-09-26 DE DE10245570A patent/DE10245570B3/en not_active Revoked
-
2003
- 2003-09-25 US US10/528,929 patent/US20060042343A1/en not_active Abandoned
- 2003-09-25 AU AU2003277898A patent/AU2003277898A1/en not_active Abandoned
- 2003-09-25 JP JP2004540698A patent/JP2006500222A/en active Pending
- 2003-09-25 EP EP03769317A patent/EP1542819A1/en not_active Withdrawn
- 2003-09-25 KR KR1020057005082A patent/KR20050044932A/en not_active Application Discontinuation
- 2003-09-25 CA CA002501080A patent/CA2501080A1/en not_active Abandoned
- 2003-09-25 CN CNA038230518A patent/CN1684783A/en active Pending
- 2003-09-25 WO PCT/EP2003/010655 patent/WO2004030847A1/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3868842A (en) * | 1971-10-12 | 1975-03-04 | William Edward Anthony | Method of making lap pin |
US5465598A (en) * | 1992-06-12 | 1995-11-14 | Topy Kogyo Kabushiki Kaisha | Method for forming an annular member |
US6247346B1 (en) * | 1996-12-18 | 2001-06-19 | Alcoa Inc. | Method of forming a drive shaft |
US6276180B1 (en) * | 1997-08-13 | 2001-08-21 | Hirschvogel Umformtechnik Gmbh | Method and apparatus for manufacturing a shift gearwheel and shift gearwheel manufactured by same |
US6230540B1 (en) * | 1999-10-19 | 2001-05-15 | Meritor Heavy Vehicle Systems Llc | Method and apparatus for forming an integral bearing shoulder in a tubular axle |
US6792782B2 (en) * | 1999-11-30 | 2004-09-21 | Parker Hannifin Sa | Method for deforming a tube near one of its ends and tool used in this method |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103831581A (en) * | 2012-11-23 | 2014-06-04 | 亚柏士气动工具股份有限公司 | Method for manufacturing impacting shaft of air tool and impacting shaft of air tool |
US20170356483A1 (en) * | 2016-06-14 | 2017-12-14 | Lippert Components, Inc. | Cold-worked riveted piston/rod assembly and method of making same |
KR20210097056A (en) * | 2020-01-29 | 2021-08-06 | 대성코리아(주) | Manufacturing method of poison rod for shock absorber |
KR102417271B1 (en) * | 2020-01-29 | 2022-07-06 | 대성코리아(주) | Manufacturing method of poison rod for shock absorber |
Also Published As
Publication number | Publication date |
---|---|
EP1542819A1 (en) | 2005-06-22 |
WO2004030847A1 (en) | 2004-04-15 |
WO2004030847A9 (en) | 2004-08-19 |
DE10245570B3 (en) | 2004-03-18 |
CA2501080A1 (en) | 2004-04-15 |
CN1684783A (en) | 2005-10-19 |
AU2003277898A1 (en) | 2004-04-23 |
KR20050044932A (en) | 2005-05-13 |
JP2006500222A (en) | 2006-01-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FELSS GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GRAU, FRANK;MOB, DETLEF;SCHREINER, MARCO;AND OTHERS;REEL/FRAME:017185/0198 Effective date: 20050304 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |