EP0876859A2 - Procédé et appareil de fabrication de carters d'essieu pour véhicule automobile - Google Patents

Procédé et appareil de fabrication de carters d'essieu pour véhicule automobile Download PDF

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Publication number
EP0876859A2
EP0876859A2 EP98107664A EP98107664A EP0876859A2 EP 0876859 A2 EP0876859 A2 EP 0876859A2 EP 98107664 A EP98107664 A EP 98107664A EP 98107664 A EP98107664 A EP 98107664A EP 0876859 A2 EP0876859 A2 EP 0876859A2
Authority
EP
European Patent Office
Prior art keywords
hollow profile
tool
differential housing
area
tool part
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.)
Withdrawn
Application number
EP98107664A
Other languages
German (de)
English (en)
Other versions
EP0876859A3 (fr
Inventor
Thomas Hülsberg
Ralf Pünjer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
Daimler Benz AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG, Daimler Benz AG filed Critical DaimlerChrysler AG
Publication of EP0876859A2 publication Critical patent/EP0876859A2/fr
Publication of EP0876859A3 publication Critical patent/EP0876859A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • B21D53/90—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards axle-housings

Definitions

  • the invention relates to a method for producing motor vehicle axle housings according to the preamble of the claim 1 and a device for performing the method according to the preamble of claim 20.
  • a generic method or a generic device is known from DE-OS 28 16 750.
  • In the known method becomes a tube of uniform diameter into a divided one High pressure forming tool inserted, after which this is closed and the pipe is sealed at both ends. After that a fluid pressure is introduced into the tube, through which this under expanded at the same time pushing the pipe ends will that it is according to the formation of the matrices of the Forming tool formed engages this.
  • the pushing the pipe ends occur in a relative movement of the ends to the fixed matrices, which due to this friction between the tube and the dies Reducing the outside of the pipe with a lubricant is treated.
  • a pipe becomes an axle housing a motor vehicle manufactured by the axle halves and an intermediate differential housing part is formed becomes.
  • Partial forming of a tube into a spherical one Differential housing part requires very high degrees of deformation, wherein the feeding of the pipe material from its end regions to a very limited extent the material thinning in Catch the area of the developing differential housing part can.
  • the reject rate on the axle housings manufactured in this way is therefore high, so that the type of manufacture described is not acceptable for cost reasons.
  • To the another is an even temperature distribution over the Length of the pipe or hollow profile to be formed in for reasonable production times practically not reasonable possible, which makes the hollow profile to be highly uneven Ductility is maintained so that the hollow profile bursts is the rule when expanding.
  • the invention has for its object a generic To further develop a method and a generic device, that an axle housing of motor vehicles in simple Way can be manufactured reliably.
  • the task is according to the invention by the features of the claim 1 regarding the procedure and the characteristics of claim 20 solved with regard to the device.
  • axle housings from Motor vehicles by means of the contour accuracy during the forming Highly precise internal pressure, i.e. Process-free, tolerance-free be manufactured.
  • Fig. 1a and 1b is a by means of internal high pressure to an axle housing of a motor vehicle, in particular a commercial vehicle formed elongated (length: 1-2 m) hollow profile 1 shown, which is divided into three sections 2,3,4. Sections 2 and 3 are tubular and form the axle halves of the axle housing, with the respective section 3 referring to the the section 2 forming the hollow profile end directly and concentrically expanded connected. The transition to section 3 runs flat conical. Which is on the end of the hollow profile opposite side of section 3 immediately following section forming the central region of the hollow profile 1 4 is perpendicular to the longitudinal extension with formation the differential housing part of the axle housing bulged and is, as can be seen from Fig. 1b, transversely to the bulge direction flattened on both sides.
  • the hollow profile 1 has a Separation process by means of a separation device of the invention Device, for example a robot-guided Cutting laser an opening on the one hand after installing the Differentials by screwing on a corresponding to the protruding Dimensions of the differential trained bulbous Cover 5 by means of an automated device provided for this purpose the device is releasably closed.
  • a separation device of the invention Device for example a robot-guided Cutting laser an opening on the one hand after installing the Differentials by screwing on a corresponding to the protruding Dimensions of the differential trained bulbous Cover 5 by means of an automated device provided for this purpose the device is releasably closed.
  • An adhesive the cover 5 or a weld is alternatively also conceivable.
  • Flattened on the other opposite Page 6 of area 8 of the differential housing part is a die Welded opening surrounding threaded ring 7, on which the differential is attached. It is conceivable - as an alternative to the previous one - According to FIGS.
  • FIG. 1 shows the individual work stations for production of the axle housing shown in Fig. 1.
  • 2 becomes a in the region 8 of the differential housing part to be molded flattened on two opposite peripheral areas Hollow section 1 with an elongated, slender, linear tubular Initial shape in a tool part 9 of a hydroforming tool 10 inserted, the parting plane of the tool part 9 runs along the hollow profile axis 14.
  • the flattening is carried out with a flattening device in one of the Forming tool 10 manufactured separately arranged work station.
  • a flattening device in one of the Forming tool 10 manufactured separately arranged work station.
  • the flattening only at Closing the two-part in two surrounding area 8 Matrices 11, 12 divided tool part 9 by a corresponding one Design of the die engraving 13 is generated.
  • this has to the advantage that instead of two manufacturing devices, the Flattening device and the tool part 9, only one Manufacturing tool is required because of the flattening device is integrated in the tool part 9. This saves on an investment cost, on the other hand, the hollow profile 1 with of the flattening generated exactly for later hydroforming arranged in a defined position in the tool part 9.
  • the upper die 12 is driven by a hydraulic drive Move towards the lower die 11, after which the The closed position of the tool part 9 is reached.
  • the die engraving 13, the forming engraving of the tool part 9 of the hydroforming tool 10 for the area 8 is shape-negative according to the differential housing part to be manufactured trained and has according to the respective flattening a flat area where it is in the closed position of the tool part 9 abuts.
  • This flat area can also form the flattening device at the same time.
  • the flat area lies immovable during the entire forming process on the flattening so that it is maintained.
  • the engraving 13 of the tool part 9 is starting from its edge to Vertex of area 8 domed flat rising, so that in the manufacturing process for the differential case part there are only large radii in the tool part 9 on which the hollow profile 1 creates. Because of the large radii the friction of the hollow profile 1 during bulging in the area 8 of the differential housing part kept low and it there is no ironing edge. This advantageously helps that bulging forming of the hollow profile 1 with higher Forming degrees is possible without this being damaged in the forming process takes.
  • the matrices 11, 12 have two opposite, starting from the edge, leading to the engraving 13, in the parting plane of the Tool part 9 located semi-cylindrical recesses that together in the closed position of the tool part 9 two in its Divisions opposite and edge-arranged bushings 15 form, in which the inserted into the tool part 9 Hollow profile 1 is kept circumferentially enclosed. At the same time the hollow profile 1 extends through the bushings 15 at both ends. To the extent possible when expanding on the bushings 15 To generate little friction, the matrices 11, 12 are Tool part 9 designed such that it only with one rest narrow edge strips 16 in the closed position.
  • the matrices 11, 12 also have a radial profile with respect to the hollow profile 1 directional central guide hole opening into the engraving 13 17, in which a support stamp 18 relative to the position of the Die 11,12 is guided.
  • the support stamp 18 carries on its end facing the inserted hollow profile 1 19 for the central section of the forming engraving 13 the contour corresponding to the respective die 11, 12 and lies in the closed position of the tool part 9 on the hollow profile 1.
  • the support stamp 18 serves as a counter-holder for the bulging hollow profile 1, with a hydraulic drive 20 is provided with a control for the internal high pressure and the movement of the hollow profile recordings mentioned below correlates is.
  • the support stamp 18 is the bulging movement of the hollow profile 1 controllable so that the middle part of the area 8 of the differential housing part evenly formed with its edge part is and thus a successive plant on the engraving 13 from the edge the die 11, 12 takes place, causing cracks on the reshaping Hollow section 1 due to premature material thinning in the middle section be prevented.
  • each of the two hollow profile recordings 21, 22 is composed of a guide housing 25 and a sleeve 26.
  • the guide housing 25 is with the hydraulic cylinder 23 connected and has a central implementation 27 and an annular space 28 surrounding the leadthrough 27.
  • the sleeve 26 is in the annular space 28 between two stops forming opposite end faces 29, 30 of the annular space 28 guided axially displaceable. That facing away from the tool part 9 End 31 of the sleeve 26 is under pressure, whereby this End 31 and on the opposite end face 29 of the annular space 28 supports a compression spring 32. This end 31 points an annular collar 40, which in the working position of FIG. 2 with the side facing away from the compression spring 32 on the end face 30 of the annular space 28 abuts.
  • the other end 33 of the sleeve 26 extends through the guide housing 24 towards the tool part 9.
  • the back pressure loading of the sleeve 26 can also be hydraulic or pneumatically.
  • the implementation 27 of the guide housing 25 is with respect to tubular initial shape of the hollow profile 1 is of the same shape, however, has a smaller cross section or one smaller diameter.
  • the bushing 27 has a centering cone 35 to which immediately a bushing formed in the sleeve 26 36 connects seamlessly.
  • the regarding the initial form of the Hollow profile 1 also has the same contour passage 36 a larger cross-section or diameter by a small amount of play than the tubular starting shape of the hollow profile 1.
  • the hollow profile receptacle 21, 22 can instead of a two-part, of a guide housing 25 and a displaceable therein Sleeve 26 existing component can be integrally formed, wherein the compression spring 32 and the annular space 28 are eliminated.
  • the rigid one Hollow profile receptacle 21, 22 has a comparatively simplified construction only two component sections with bushings different Diameter on each other over a Connect the conical opening to the tool part 9. The diameters are relative to that of the initial shape of the hollow profile 1 - as mentioned above - dimensioned accordingly.
  • the implementation 27 of the guide housing 25 of the hollow profile receptacles 21,22 is on the back of a postmark 37 locked in it by means of a separate drive is guided in a fluid-tight manner.
  • Postmark 37 has a conically tapering pin 38 on the end face between its chamfer and the duct wall 39 of the guide housing 25 in the hollow profile receptacle 21, 22nd hollow profile 1 to be inserted can be clamped in a sealing manner.
  • a fluid channel which on the one hand via the high-pressure fluid connection with a high-pressure fluid generation system is connected and on the other hand by the Pin 38 opens axially into the hollow profile receptacle 21, 22, after which the inserted hollow profile 1 with the pressure fluid can be filled and subjected to high pressure.
  • the spigot 38 also on a rear of the hollow profile receptacle 21,22 Be formed bottom, which closes the passage 27 and which has a high pressure fluid connection.
  • the Implementation 27 is replaced by a blind hole. Of the Postmark 37 and its control can be under There is no need to reduce the expenditure on equipment.
  • the hollow profile receptacles 21, 22 are now shown in FIG Hydraulic cylinder 23 move further towards one another in the direction of the arrow, the hollow profile ends due to the slightly larger Diameter of the bushing 36 of the sleeve 26 inserted into it will.
  • the hollow profile ends are moved over the centering cone 35 of the implementation 27 introduced into this, due to the action of with smaller diameter with regard to the hollow profile ends Implementation 27 and the thrust of the cylinders 23 Ends are drawn.
  • the postmark is made 37 moved in the direction of the tool part 9, wherein it in the hollow profile end is inserted and so its shape essentially maintained.
  • the hollow profile end is entirely of the hollow profile receptacle 21, 22 enclosed.
  • the hollow profile end By pulling in the hollow profile end its diameter up to 30% of the diameter of the original shape downsized, whereby the hollow profile 1 after the final Hydroforming the three sections 2,3,4 cross section of different sizes.
  • Starting from that Hollow section end as section 2 of smallest diameter is the Degree of deformation with respect to the section provided with the bulge 4 very large, but the degree of deformation is based on Section 3, which has a larger diameter, and of from which the actual expansion starts. Consequently the hollow profile 1 in the internal high-pressure forming tool 10 as a whole can be formed with very high degrees of deformation.
  • the hollow profile 1 in one means of the hydraulic cylinder 23 operated compression process pushed together, without causing relative movements to generate friction between the hollow profile receptacle 21 and 22 and the hollow profile 1 is coming.
  • the Hollow profile material at least on the engraving 13 of the dies 11, 12 approximately creates.
  • Support stamp 18 radially outward in the direction of the arrow retracted, using it for controlled forming in area 8 of the differential housing part throughout Forming process rest on the hollow profile 1 and in the end position of the manufacturing process flush with your engraving End face 19 are fitted.
  • While expanding the Hollow section 1 in area 8 are also the sections 2 and 3, i.e. the axle halves, slightly expanded which are on the bushing walls 39 and 42 of the Fit guide housing 25 and sleeve 26.
  • Section 3 remains in terms of its diameter essentially unchanged.
  • hollow profile material to area 8 can also during the expansion of the hollow profile end pushing stamps 37 acting on the end face in a relative movement to the hollow profile holder 21, 22 further to the tool part 9 to be moved.
  • the hollow profile 1 by expanding to one of the final forms in terms of Contour and cross-sectional size roughly approximated intermediate shape can then increase the internal high pressure
  • the intermediate shape is calibrated to 1000-3000 bar to the final shape will.
  • the fluid pressure is released and by means of the hydraulic cylinders 23 the hollow profile receptacles 21,22 retracted, the compression spring 32 again can relax. Since the reshaped axle housing on his Differential housing part held by the matrices 11,12 will, when retracting the recordings 21,22, the hollow profile ends and thus the axle halves from the by pulling in and the hydroforming formed press fit on the Feed-through wall 39 and 42 detached in a simple manner. Finally, the matrices 11, 12 are moved out of the area 8 retracted, whereby the tool part 9 opens and that completely formed axle housing can be removed.
  • hollow profile 1 In addition, one-sided flattening is conceivable on the hollow profile 1, after which the expansion dipping takes place.
  • the hollow profile 1 on its remaining circumference to be expanded from the internal high-pressure forming tool 10 controlled while expanding evasive to the outside through the support stamp 18, this must be designed with a bowl-shaped end face 19, supported.
  • the axle housing is made from two hollow sections 43 and 44 is, a first hollow profile 43 of larger diameter is formed into the differential case and a second Hollow section 44 of smaller diameter - separate from the first - to a conical bulged double part by expanding is formed.
  • a first hollow profile 43 of larger diameter is formed into the differential case and a second Hollow section 44 of smaller diameter - separate from the first - to a conical bulged double part by expanding is formed.
  • hydroforming tools for this purpose provided in the device, the first forming tool the formation of the differential housing part and the second is assigned to the formation of the axle halves 46, 47.
  • the engraving of the tool part of the first forming tool is according to the final shape of the differential housing to be trained designed, whereas the engraving of the tool part of the second forming tool is designed as a double cone.
  • the Center diameter corresponds at least approximately to the diameter the execution of the tool part of the first forming tool, with the hollow profile receptacles and the bushings of the tool part of the first forming tool according to the Larger diameter of the hollow profile 43 to be formed Diameters are larger than that of the second for forming a hollow profile 44 serving smaller diameter forming tool. This allows for a smooth transition the later connection of the axle halves 46, 47 to the differential housing part.
  • the two hollow profiles 43 and 44 are shaped in the same way Way like that of the hollow profile 1, but without the ends 2 of the profiles 43, 44 are drawn in. This achieves one Structural simplification of the forming tool, especially the Training of the hollow profile recordings. Furthermore, it is with the Forming of the hollow profile 43 due to its very short dimensions not necessarily necessary from hollow profile material to have to push the area of the ends. This allows the Postmark 37 and its drive under other apparatus Simplification of the forming tool is not necessary, however the tracking of the recordings to ensure the seal of the hollow profile 43 must be secured. For the rest is a reliable production of the hollow section 43 alone conceivable by expanding without the simultaneous compression process.
  • the lid 5 is here comparable to the embodiment of Fig. 5a, b formed with the forming of the hollow profile 43 and thereby integrally connected to the differential housing part 4.
  • FIGS. 6a-d are individual parts thus in the embodiments of FIGS. 1a and b and the 5a and b are formed in one piece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Motor Power Transmission Devices (AREA)
EP98107664A 1997-05-09 1998-04-28 Procédé et appareil de fabrication de carters d'essieu pour véhicule automobile Withdrawn EP0876859A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997119629 DE19719629C2 (de) 1997-05-09 1997-05-09 Verfahren und Einrichtung zur Herstellung von Kraftfahrzeugachsgehäusen
DE19719629 1997-05-09

Publications (2)

Publication Number Publication Date
EP0876859A2 true EP0876859A2 (fr) 1998-11-11
EP0876859A3 EP0876859A3 (fr) 2000-10-11

Family

ID=7829107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98107664A Withdrawn EP0876859A3 (fr) 1997-05-09 1998-04-28 Procédé et appareil de fabrication de carters d'essieu pour véhicule automobile

Country Status (2)

Country Link
EP (1) EP0876859A3 (fr)
DE (1) DE19719629C2 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102886467A (zh) * 2012-09-24 2013-01-23 重庆科技学院 汽车驱动桥整体复合胀形液压机
CN102886461A (zh) * 2012-09-24 2013-01-23 重庆科技学院 汽车驱动桥整体复合胀形生产工艺
CN103252404A (zh) * 2013-05-22 2013-08-21 燕山大学 重型卡车无焊缝桥壳的整体成形方法
CN103286196A (zh) * 2013-06-06 2013-09-11 重庆科技学院 汽车驱动桥整体复合胀形生产线及加工方法
CN103568724A (zh) * 2012-07-27 2014-02-12 上海永太汽车零部件厂 汽车桥壳及汽车桥壳成形模具及其汽车桥壳成形方法
CN105728539A (zh) * 2016-05-11 2016-07-06 燕山大学 大中型汽车桥壳管件充液压制成形模具
CN105903818A (zh) * 2016-06-29 2016-08-31 江西江铃底盘股份有限公司 一种汽车驱动桥桥壳本体成型模具
CN107639144A (zh) * 2017-11-02 2018-01-30 江西江铃底盘股份有限公司 一种采用高强度焊管和无需退火的驱动桥桥壳液压成形方法
CN108994532A (zh) * 2018-07-21 2018-12-14 河北弘凯重型机床有限公司 一种汽车后桥壳及其加工工艺
CN110153264A (zh) * 2019-04-22 2019-08-23 秦皇岛通桥科技有限公司 同轴式电动汽车驱动桥桥壳的整体成形方法
CN116900149A (zh) * 2023-07-12 2023-10-20 湖北通桥科技有限公司 一种立式液压桥壳胀形设备
CN119870904A (zh) * 2025-02-25 2025-04-25 西峡县内燃机进排气管有限责任公司 一种驱动桥壳加工方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10352230B3 (de) * 2003-11-08 2005-04-14 Daimlerchrysler Ag Kraftfahrzeugachsgehäuse
DE102004013872B4 (de) * 2004-03-20 2006-10-26 Amborn, Peter, Dr.-Ing. Verfahren und Werkzeug zur Umformung eines metallischen Hohlkörpers in einem Umformwerkzeug unter erhöhter Temperatur und unter Innendruck
DE102005057810A1 (de) * 2005-12-03 2007-06-06 Zf Friedrichshafen Ag Verfahren zur Herstellung von Getriebegehäusen, insbesondere von Getriebegehäusen für PKW und NKW

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Publication number Priority date Publication date Assignee Title
US1501023A (en) * 1920-08-25 1924-07-08 Gen Motors Corp Process and apparatus for forming metal objects
JPS4832903B1 (fr) * 1968-02-23 1973-10-09
DE2816750A1 (de) * 1978-04-18 1979-10-25 Thyssen Industrie Verfahren zur herstellung von achsgehaeusen
JPS5838256B2 (ja) * 1980-01-08 1983-08-22 工業技術院長 自動車用アクスル・ハウジングの製造方法
US5070717A (en) * 1991-01-22 1991-12-10 General Motors Corporation Method of forming a tubular member with flange

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103568724B (zh) * 2012-07-27 2015-11-18 上海永太汽车零部件厂 汽车桥壳及汽车桥壳成形模具及其汽车桥壳成形方法
CN103568724A (zh) * 2012-07-27 2014-02-12 上海永太汽车零部件厂 汽车桥壳及汽车桥壳成形模具及其汽车桥壳成形方法
CN102886467A (zh) * 2012-09-24 2013-01-23 重庆科技学院 汽车驱动桥整体复合胀形液压机
CN102886467B (zh) * 2012-09-24 2014-07-23 重庆科技学院 汽车驱动桥整体复合胀形液压机
CN102886461B (zh) * 2012-09-24 2014-11-26 重庆科技学院 汽车驱动桥整体复合胀形生产工艺
CN102886461A (zh) * 2012-09-24 2013-01-23 重庆科技学院 汽车驱动桥整体复合胀形生产工艺
CN103252404A (zh) * 2013-05-22 2013-08-21 燕山大学 重型卡车无焊缝桥壳的整体成形方法
CN103252404B (zh) * 2013-05-22 2015-09-09 燕山大学 重型卡车无焊缝桥壳的整体成形方法
CN103286196A (zh) * 2013-06-06 2013-09-11 重庆科技学院 汽车驱动桥整体复合胀形生产线及加工方法
CN105728539A (zh) * 2016-05-11 2016-07-06 燕山大学 大中型汽车桥壳管件充液压制成形模具
CN105903818A (zh) * 2016-06-29 2016-08-31 江西江铃底盘股份有限公司 一种汽车驱动桥桥壳本体成型模具
CN107639144A (zh) * 2017-11-02 2018-01-30 江西江铃底盘股份有限公司 一种采用高强度焊管和无需退火的驱动桥桥壳液压成形方法
CN107639144B (zh) * 2017-11-02 2023-11-17 江西江铃底盘股份有限公司 一种采用高强度焊管和无需退火的驱动桥桥壳液压成形方法
CN108994532A (zh) * 2018-07-21 2018-12-14 河北弘凯重型机床有限公司 一种汽车后桥壳及其加工工艺
CN110153264A (zh) * 2019-04-22 2019-08-23 秦皇岛通桥科技有限公司 同轴式电动汽车驱动桥桥壳的整体成形方法
CN116900149A (zh) * 2023-07-12 2023-10-20 湖北通桥科技有限公司 一种立式液压桥壳胀形设备
CN119870904A (zh) * 2025-02-25 2025-04-25 西峡县内燃机进排气管有限责任公司 一种驱动桥壳加工方法

Also Published As

Publication number Publication date
EP0876859A3 (fr) 2000-10-11
DE19719629C2 (de) 2001-09-06
DE19719629A1 (de) 1998-11-19

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