CA2501080A1 - 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
- CA2501080A1 CA2501080A1 CA002501080A CA2501080A CA2501080A1 CA 2501080 A1 CA2501080 A1 CA 2501080A1 CA 002501080 A CA002501080 A CA 002501080A CA 2501080 A CA2501080 A CA 2501080A CA 2501080 A1 CA2501080 A1 CA 2501080A1
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- CA
- Canada
- Prior art keywords
- workpiece
- transition area
- tubular
- forming
- area
- 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
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
- 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
-
- 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
-
- 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
Disclosed is a method for producing a tubular workpiece, particularly a shock absorber piston rod. In a first step of said method, a first partial area (3a) of an original tubular workpiece is initially reduced by means of a radial deformation process so as to decrease the peripheral diameter thereof, and a transition area (3c) that extends diagonal to the longitudinal axis (A) of the original tubular workpiece (3) is formed, said transition area (3c) connecting the first partial area (3a) of the original workpiece, which has a reduced peripheral diameter, to a non-reduced second partial area (3b) that is adjacent to the transition area (3c). In a subsequent second step of the inventive method, the transition area (3c) of the original workpiece (3) is provided with a steep structure by means of a deformation process so as to from the substantially rectangular shoulder (2) of the workpiece (1).
Description
English translation of application text as originally filed ~Ilethod and device for producing a tubular workplace, especially a shock absorber piston rod, and a workplace of that kind 5peciflcatiion The present invention relates to a method far producing a tubular workplace, especially a shack-absorber piston rod, wherein, starting out from a tubular initial workplace, a first area of the initial workplace is reduced in a'fret 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 woricpieco, is formed, the transition area extending between tho first area of the tubular initial workplace having the reduced diameter and a non-roduced second area following the transition area, and to a workplace of that kind and a device for producing such a workplace.
A method of that kind is known and is used for producing cold-farmed workplaces, for example a shoclC~absorber piston rod. Such shock-absorber pistan rods are employed especially in ccertain 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 workplace, with an angle of ~~6°.
This is necessary in order to keep the wail thickness of the initial tube of the shock-absorbsr piston rod subBtantially constant so as to not weaken the wall of the workplace. 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 46° relative to the longitudinal axis of the piston rod, Such an adaptor sleeve constitutes an extra part which resulfis 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.
English translation of pales 3, Via, ~ and 8 as amended under Chapter II PCT
GB-A 14'fi2860 describes a method for forming an end of a tube, wherein the tube is initially reduced in diameter by rotary swaging and an inclined transition area is formed on the tube. The transition area is then heated, and the heated transition area is formed to a rectangular shoulder by axial pressing.
Now, it is the object of the present invention to improve a method for producing a workpiece, espsclaily a shock-absorber piston rod, and a workplace of the afare-mentloned kind, so thafi a workplace 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 workplace is cold-formed to obtain a substantially rectangular shauid~r.
The features according to the invention provide a fiavorable way of producing, in a simple way and solely by cold-forming steps, a tubular workplace with a substantially rectangular shoulder, especially a shock~absorber piston rod, from a tubular initial workplace. Due to the fact that the rectangular shoulder can be produced directly by the method of the invention, using an adaptor sleeve, which is vastly in terms of production and assembly, is therefore na longer necessary for the production of a workplace made according to the method of the invention, which advantagsous(y reduces its production costs as a whole.
Cold farming the initial workplace 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 workplace occurs.
3a 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.
Qther advantageous further developments of the invention era 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 worfcpiece after a first process step;
Fig. 2 shrnrva the wortcpiecc of Fig. 1 after the second process step; and Figs. 3 and 4 show one embodiment of a device for producing a warkpiece.
tn order to arrive at the intermediate product, illustrated in Fig. 1, of the production process of a warkpiace, indicated by reference numeral 1, the workplace 1 having a rectangular shoulder 2, the upper area of a tubular initial workplace ~ is first reduced by a cold-forming process, for example a rotary swaging process, which is known as such and which, therefore, will rat be described herein in more detail, whereby that first area 3a of the tubular initial woricpiece 3 is reduced to a smaller diameter than a non-reduced second area 3b. Preferably, a transition area 3c between the first and the second erases 3a and 3b is again formed as a circumferential inclined surface with an inclination of approximately 45° relative to the longitudinal axis A of the initial workplace 3.
As is roadily apparent from F'ig. 1, the wall 5 of the tubulsr initial workplace 3, part of which is shown in arose-section, is reduced by the coil-forming process either not at ail or only insignifiicantly, so that no weakening of the material of the initial workplace 3 occurs in the transition area 3c. Now, in order to convert that intermediate product into the final product illustrated in Fig. 2, i.e, the tubular workplace 1 with the substantially rectangular shoulder 2, the invention provides to subject the transition area 3c to a forming operation, especially an orbital forging or axial pressing operation. The orbital forging operation may conveniently be pertormed 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 ark and will therefore not be described herein in more detail.
As it can be seen from the representation of the wall 5 of the tuaular inltlal workplace a, no weaKenlng of the wail 5 In the area of the shoulder 2 occurs in this case, either.
The method is advantageously and ~sp~cially w~II suited for the production of a shock-absorber piston rod with a rectangular shoulder. In addition to such shocic-absorber piston rods, the invention also lends itself to producing other workplaces, which need to have a rectangular or a substantially shoulder, from a tubular initial workplace in a single piece.
Figs. 3 and 4 now show one embodiment of a device, indicated generally by reference numeral 1 Q, for producing the workplace 1 with a substantially rectangular shoulder 2. For carrying out the first process step mentioned above, namely for producing the transition area 3c between the first and the second areas 3a and 3b of the initial workplace ~, the device 10 comprises a reducing unit 1 ~
designed in this case as a rotary swaging tool with a plurality of rotary swaging dies 12. The rotary swaging dies 12 act upon the initial workplace 3 in radial direction R.
each rotary swaging die comprises an inclined forming surface 13, the inclination of which relative to the longitudinal axis A of the initial workplace 3 is again approximately equal to 45°, corresponding substantially to the inclination of the inclined surfiace of the transition area 3c to be produced.
Once the inclined transition area 3c has been formed by a reducing process known as such, which therefore will not be described herein in more detail, especially by rotary swaging, the initial workpiece 3 is transferr~d from the reducing unit 11 of the device 10 described above to a further forming unit of the device 10, designed in the present case as an orbital forming unit 1 ~, where the second process step is to be carried out. That orbital forming unit 15 comprises an orbital die 16, which performs an orbital movement about a longitudinal axis A, acting upon the transition area 3c of the initial workpiece 3 by its working surface 77 until the substantially rectangular shoulder 2 has been formed.
A method of that kind is known and is used for producing cold-farmed workplaces, for example a shoclC~absorber piston rod. Such shock-absorber pistan rods are employed especially in ccertain 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 workplace, with an angle of ~~6°.
This is necessary in order to keep the wail thickness of the initial tube of the shock-absorbsr piston rod subBtantially constant so as to not weaken the wall of the workplace. 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 46° relative to the longitudinal axis of the piston rod, Such an adaptor sleeve constitutes an extra part which resulfis 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.
English translation of pales 3, Via, ~ and 8 as amended under Chapter II PCT
GB-A 14'fi2860 describes a method for forming an end of a tube, wherein the tube is initially reduced in diameter by rotary swaging and an inclined transition area is formed on the tube. The transition area is then heated, and the heated transition area is formed to a rectangular shoulder by axial pressing.
Now, it is the object of the present invention to improve a method for producing a workpiece, espsclaily a shock-absorber piston rod, and a workplace of the afare-mentloned kind, so thafi a workplace 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 workplace is cold-formed to obtain a substantially rectangular shauid~r.
The features according to the invention provide a fiavorable way of producing, in a simple way and solely by cold-forming steps, a tubular workplace with a substantially rectangular shoulder, especially a shock~absorber piston rod, from a tubular initial workplace. Due to the fact that the rectangular shoulder can be produced directly by the method of the invention, using an adaptor sleeve, which is vastly in terms of production and assembly, is therefore na longer necessary for the production of a workplace made according to the method of the invention, which advantagsous(y reduces its production costs as a whole.
Cold farming the initial workplace 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 workplace occurs.
3a 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.
Qther advantageous further developments of the invention era 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 worfcpiece after a first process step;
Fig. 2 shrnrva the wortcpiecc of Fig. 1 after the second process step; and Figs. 3 and 4 show one embodiment of a device for producing a warkpiece.
tn order to arrive at the intermediate product, illustrated in Fig. 1, of the production process of a warkpiace, indicated by reference numeral 1, the workplace 1 having a rectangular shoulder 2, the upper area of a tubular initial workplace ~ is first reduced by a cold-forming process, for example a rotary swaging process, which is known as such and which, therefore, will rat be described herein in more detail, whereby that first area 3a of the tubular initial woricpiece 3 is reduced to a smaller diameter than a non-reduced second area 3b. Preferably, a transition area 3c between the first and the second erases 3a and 3b is again formed as a circumferential inclined surface with an inclination of approximately 45° relative to the longitudinal axis A of the initial workplace 3.
As is roadily apparent from F'ig. 1, the wall 5 of the tubulsr initial workplace 3, part of which is shown in arose-section, is reduced by the coil-forming process either not at ail or only insignifiicantly, so that no weakening of the material of the initial workplace 3 occurs in the transition area 3c. Now, in order to convert that intermediate product into the final product illustrated in Fig. 2, i.e, the tubular workplace 1 with the substantially rectangular shoulder 2, the invention provides to subject the transition area 3c to a forming operation, especially an orbital forging or axial pressing operation. The orbital forging operation may conveniently be pertormed 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 ark and will therefore not be described herein in more detail.
As it can be seen from the representation of the wall 5 of the tuaular inltlal workplace a, no weaKenlng of the wail 5 In the area of the shoulder 2 occurs in this case, either.
The method is advantageously and ~sp~cially w~II suited for the production of a shock-absorber piston rod with a rectangular shoulder. In addition to such shocic-absorber piston rods, the invention also lends itself to producing other workplaces, which need to have a rectangular or a substantially shoulder, from a tubular initial workplace in a single piece.
Figs. 3 and 4 now show one embodiment of a device, indicated generally by reference numeral 1 Q, for producing the workplace 1 with a substantially rectangular shoulder 2. For carrying out the first process step mentioned above, namely for producing the transition area 3c between the first and the second areas 3a and 3b of the initial workplace ~, the device 10 comprises a reducing unit 1 ~
designed in this case as a rotary swaging tool with a plurality of rotary swaging dies 12. The rotary swaging dies 12 act upon the initial workplace 3 in radial direction R.
each rotary swaging die comprises an inclined forming surface 13, the inclination of which relative to the longitudinal axis A of the initial workplace 3 is again approximately equal to 45°, corresponding substantially to the inclination of the inclined surfiace of the transition area 3c to be produced.
Once the inclined transition area 3c has been formed by a reducing process known as such, which therefore will not be described herein in more detail, especially by rotary swaging, the initial workpiece 3 is transferr~d from the reducing unit 11 of the device 10 described above to a further forming unit of the device 10, designed in the present case as an orbital forming unit 1 ~, where the second process step is to be carried out. That orbital forming unit 15 comprises an orbital die 16, which performs an orbital movement about a longitudinal axis A, acting upon the transition area 3c of the initial workpiece 3 by its working surface 77 until the substantially rectangular shoulder 2 has been formed.
Claims
Claims:
1. Method for producing a tubular workpiece, especially a shock-absorber piston rod, wherein, starting out from a tubular initial workpiece (3), a first area (3a) 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 (3c), extending at an angle relative to the longitudinal axis (A) of the tubular initial workpiece (3), is formed, said transition area (3c) extending between said first area (3a) of the initial workpiece (3) having the reduced diameter and a non-reduced second area (3b) following the transition area (3c), characterized in that in a second process step, following the first process step, the transition area (3c) of the initial workpiece (3) is cold-formed to obtain the substantially rectangular shoulder (2) of the workpiece (1).
2. The method as defined in Claim 1, characterized in that radial forming of the first area (3a) is effected by rotary swaging.
3. The method as defined in Claim 1, characterized in that the forming process of the second process step is an orbital forging or axial pressing process.
4. The method as defined in Claim 3, characterized in that the orbital forging process is effected by at least one of circular movementand a tilting movement.
5. Workpiece with a substantially rectangular shoulder (2), characterized in that the shoulder (2) is an integral part of the wall of the initial workpiece (3) and that the shoulder (2) is produced by cold forming the initial workpiece (3) by a radial forming process, followed by an orbital forging or axial pressing process, 6. Device for producing a tubular workpiece with a substantially rectangular shoulder (2), characterized in that the device (10) comprises a reducing unit (11), by means of which a transition area (3c) in the form of a circumferential inclined surface can be formed in a tubular initial workpiece (3), and a forming unit (15) by means of which the inclined transition area (3c) can ba converted to a substantially rectangular shoulder (2) of the workpiece (1) by cold forming of the initial workpiece (3).
7. The device as defined in Claim 6, characterized in that the reducing unit (11) of the device (10) comprises at least one forging die (12).
8. The device as defined in Claim 7, characterized in that at least one forging die comprises an inclined forming surface (13).
8. The device as defined in Claim 6, characterized in that the forming unit (15) of the device (10) is designed as orbital forming unit.
10. The device as defined in Claim 6, characterized in that the forming unit (15) comprises an orbital tool (16) that performs an orbital movement about a longitudinal axis (A) of the initial workpiece (3).
1. Method for producing a tubular workpiece, especially a shock-absorber piston rod, wherein, starting out from a tubular initial workpiece (3), a first area (3a) 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 (3c), extending at an angle relative to the longitudinal axis (A) of the tubular initial workpiece (3), is formed, said transition area (3c) extending between said first area (3a) of the initial workpiece (3) having the reduced diameter and a non-reduced second area (3b) following the transition area (3c), characterized in that in a second process step, following the first process step, the transition area (3c) of the initial workpiece (3) is cold-formed to obtain the substantially rectangular shoulder (2) of the workpiece (1).
2. The method as defined in Claim 1, characterized in that radial forming of the first area (3a) is effected by rotary swaging.
3. The method as defined in Claim 1, characterized in that the forming process of the second process step is an orbital forging or axial pressing process.
4. The method as defined in Claim 3, characterized in that the orbital forging process is effected by at least one of circular movementand a tilting movement.
5. Workpiece with a substantially rectangular shoulder (2), characterized in that the shoulder (2) is an integral part of the wall of the initial workpiece (3) and that the shoulder (2) is produced by cold forming the initial workpiece (3) by a radial forming process, followed by an orbital forging or axial pressing process, 6. Device for producing a tubular workpiece with a substantially rectangular shoulder (2), characterized in that the device (10) comprises a reducing unit (11), by means of which a transition area (3c) in the form of a circumferential inclined surface can be formed in a tubular initial workpiece (3), and a forming unit (15) by means of which the inclined transition area (3c) can ba converted to a substantially rectangular shoulder (2) of the workpiece (1) by cold forming of the initial workpiece (3).
7. The device as defined in Claim 6, characterized in that the reducing unit (11) of the device (10) comprises at least one forging die (12).
8. The device as defined in Claim 7, characterized in that at least one forging die comprises an inclined forming surface (13).
8. The device as defined in Claim 6, characterized in that the forming unit (15) of the device (10) is designed as orbital forming unit.
10. The device as defined in Claim 6, characterized in that the forming unit (15) comprises an orbital tool (16) that performs an orbital movement about a longitudinal axis (A) of the initial workpiece (3).
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 |
|---|---|
| CA2501080A1 true CA2501080A1 (en) | 2004-04-15 |
Family
ID=31724850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002501080A Abandoned CA2501080A1 (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) |
Families Citing this family (11)
| 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 |
| CN103831581B (en) * | 2012-11-23 | 2016-02-24 | 亚柏士气动工具股份有限公司 | The manufacture method of air tool impacting shaft and air tool impacting shaft |
| US20170356483A1 (en) * | 2016-06-14 | 2017-12-14 | Lippert Components, Inc. | Cold-worked riveted piston/rod assembly and method of making same |
| 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 |
| KR102417271B1 (en) * | 2020-01-29 | 2022-07-06 | 대성코리아(주) | Manufacturing method of poison rod for shock absorber |
| 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 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3868842A (en) * | 1971-10-12 | 1975-03-04 | William Edward Anthony | Method of making lap pin |
| 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 |
| EP0575112B1 (en) * | 1992-06-12 | 1996-09-04 | 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 |
| WO1999008820A1 (en) * | 1997-08-13 | 1999-02-25 | Hirschvogel Umformtechnik Gmbh | Method for producing a gear wheel, device for carrying out the method, and wheel produced by this method |
| 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 |
| 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 EP EP03769317A patent/EP1542819A1/en not_active Withdrawn
- 2003-09-25 CN CNA038230518A patent/CN1684783A/en active Pending
- 2003-09-25 KR KR1020057005082A patent/KR20050044932A/en not_active Application Discontinuation
- 2003-09-25 WO PCT/EP2003/010655 patent/WO2004030847A1/en not_active Application Discontinuation
- 2003-09-25 CA CA002501080A patent/CA2501080A1/en not_active Abandoned
- 2003-09-25 JP JP2004540698A patent/JP2006500222A/en active Pending
- 2003-09-25 US US10/528,929 patent/US20060042343A1/en not_active Abandoned
- 2003-09-25 AU AU2003277898A patent/AU2003277898A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20060042343A1 (en) | 2006-03-02 |
| CN1684783A (en) | 2005-10-19 |
| WO2004030847A1 (en) | 2004-04-15 |
| EP1542819A1 (en) | 2005-06-22 |
| JP2006500222A (en) | 2006-01-05 |
| KR20050044932A (en) | 2005-05-13 |
| WO2004030847A9 (en) | 2004-08-19 |
| DE10245570B3 (en) | 2004-03-18 |
| AU2003277898A1 (en) | 2004-04-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |