EP0770435A1 - Verfahren zur Herstellung eines Konstruktionswerkstücks und Achsträger - Google Patents

Verfahren zur Herstellung eines Konstruktionswerkstücks und Achsträger Download PDF

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Publication number
EP0770435A1
EP0770435A1 EP95114847A EP95114847A EP0770435A1 EP 0770435 A1 EP0770435 A1 EP 0770435A1 EP 95114847 A EP95114847 A EP 95114847A EP 95114847 A EP95114847 A EP 95114847A EP 0770435 A1 EP0770435 A1 EP 0770435A1
Authority
EP
European Patent Office
Prior art keywords
hollow profile
bending
internal pressure
axle support
tube
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.)
Granted
Application number
EP95114847A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0770435B1 (de
Inventor
Egon Olszewski
Rainer Hansen
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.)
Benteler Deustchland GmbH
Original Assignee
Benteler Deustchland GmbH
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 Benteler Deustchland GmbH filed Critical Benteler Deustchland GmbH
Priority to DE59504498T priority Critical patent/DE59504498D1/de
Priority to ES95114847T priority patent/ES2124949T3/es
Priority to EP19950114847 priority patent/EP0770435B1/de
Publication of EP0770435A1 publication Critical patent/EP0770435A1/de
Application granted granted Critical
Publication of EP0770435B1 publication Critical patent/EP0770435B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • 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
    • 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
    • B21D26/037—Forming branched tubes
    • 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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/15—Bending tubes using mandrels or the like using filling material of indefinite shape, e.g. sand, plastic material

Definitions

  • the invention relates on the one hand to a method for producing a construction workpiece, in particular an axle support for motor vehicles, by bending and hydroforming a straight metallic hollow profile and on the other hand to an axle support.
  • Construction workpieces such as axle beams of motor vehicles are now consistently designed in a lightweight construction.
  • Such construction workpieces are usually hollow molded parts which are produced from a straight metallic, usually cylindrical tube.
  • the hydroforming process offers a wide range of options for forming the tube.
  • a cylindrical tube is expanded as a starting profile under the pressure of a liquid with simultaneous axial feed movement and pressed against the shape of a divided hollow tool.
  • Hydroforming is described, inter alia, in "WT Riversidestechnik” 79 (1989), pages 210 to 214. Because of its manufacturing advantages, the hydroforming process is widespread, particularly in the mass production of construction workpieces, for example for the automotive industry.
  • attachments are welded onto the construction workpiece.
  • Such attachments can be reinforcements, for example in the form of gusset plates, which serve to stabilize the construction workpiece.
  • reinforcements for example in the form of gusset plates, which serve to stabilize the construction workpiece.
  • such attachments are required to fasten the construction workpiece or to fix other components on the construction workpiece.
  • the invention is based on the object of producing curved construction workpieces to make it more economical and to reduce the number of add-on parts to be subsequently welded onto the construction workpiece.
  • the invention further aims at a simpler and more economically designed axle support for motor vehicles.
  • the solution to the procedural part of this task consists in the measures listed in the characterizing part of claim 1.
  • the solution to the objective part of the task can be seen in the characterizing features of claim 7.
  • the basic idea of the invention is to first shift enough material into the zones of the forming on the straight starting profile, as a result of which forming areas are preformed.
  • the contour of the construction workpiece is then produced by bending and hydroforming.
  • fastening or reinforcement areas of the construction workpiece can also be hydroformed from the initial profile before the bending process.
  • the method according to the invention thus makes it possible in any case to replace a large part of the add-on parts that would otherwise have to be welded on after the final shaping.
  • a straight metallic hollow profile in the form of a tube is initially assumed. This is placed in a multi-part press tool.
  • the press tool is designed in such a way that it allows targeted preforming in the required areas without causing disadvantageous wall thinning in these zones.
  • the tube is closed with a hydraulic internal pressure and an axial force acting on the ends of the tube.
  • the axial force is usually transmitted to the pipe on both sides with rigid tools. Usually these are hydraulically moved pistons with appropriately shaped heads that close the tube at both ends. An increasing pressure is then built up in the pipe. As soon as this is so high that the tube is deformed in the area of the pre-deformed areas, the ends of the tube are pressed in the axial direction. This process is controlled depending on the internal pressure. Then there is a shift of profile material to the areas to be deformed. This results in a regionally specific preforming of bulges in the zones of the later bend or the later fastening or reinforcement areas.
  • An advantage of the method is that with the first manufacturing step, the zones of the forming are first prefabricated on the straight tube.
  • the zones of maximum deformation, in which the subsequent bending of the preformed hollow profile is carried out, can be specifically prepared accordingly for the subsequent plastic deformation.
  • the bending process takes place under high internal pressure so that the hydroformed contours remain. Wrinkling or indentation of the pipe is prevented. Preforming the zones of maximum deformation also avoids the elastic springback that is otherwise typical for bending.
  • the subsequent final shaping is also carried out by hydraulic internal pressure. This gives the construction workpiece its final shape. A pushing the ends of the bent Construction workpiece is not required. This is an essential procedural advantage.
  • the construction workpiece Before the hydraulic final shaping, depending on the design, the construction workpiece can also be flattened in certain areas. Here, the preformed bulges and / or sections of the construction workpiece are flattened. This process takes place in the hydroforming tool.
  • control devices and the hydraulic devices of the production plant can be used both in the preforming, in the bending process and in the final shaping.
  • the number of attachments to be welded on is reduced by the method according to the invention. Necessary fastening or reinforcement areas on the body of the construction workpiece can be molded in one piece from the initial profile. The additional effort for the provision and definition of add-on parts is minimized or can even be completely saved, depending on the construction workpiece.
  • the bulging takes place under the influence of a counter pressure which acts specifically in the area to be deformed. This enables precise control of the expansion process.
  • the size of the preformed areas is proportional to the length reduction of the hollow profile. In order to avoid material thinning or even bursting in the area of the bulge that forms, the forehead of the bulge is supported by the counterpressure during the forming.
  • the back pressure can basically be generated in different ways.
  • a convenient way include counter cylinders in the manufacturing process, which are coordinated with the press tool.
  • the construction workpiece can then be subjected to heat treatment by annealing both before the bending process and after the bending process.
  • the residual stresses created by the deformation process are reduced. Distortion of the structure due to the deformation can also be reduced in this way.
  • the material of the construction workpiece accordingly receives the properties desired for further processing.
  • the construction workpiece is calibrated during or after the final shaping.
  • the final shaping only includes calibration. With the repressing, the surface roughness is leveled and the dimensional accuracy of the construction workpieces is increased. In addition, the strength is increased during calibration.
  • the construction workpieces can be provided with assembly openings.
  • the mounting openings may be necessary both for fastening additional components and for carrying out other components, such as a brake line.
  • the assembly openings are produced according to the features of claim 6 with the internal pressure acting. In this way it is avoided that the construction workpiece is deformed during the cutting manufacture of the assembly openings, for example by cutting or punching.
  • a structurally simple and technically economical axle support for motor vehicles is required 7 characterized.
  • Such a curved axle support is made in one piece from a tube with integrated fastening or reinforcement areas.
  • hydroforming is first carried out with feeding on the straight pipe. The zones of maximum forming are preformed. The hydroformed pipe is then bent under internal pressure. The preformed areas are then pressed flat according to the respective requirements. Fastening or reinforcement areas can be formed in this way.
  • the axle support is given its final shape by hydroforming or calibration. If necessary, the axle carrier is then provided with holes, the punching being carried out under internal pressure as described.
  • the number of attachments to be welded on is reduced. As a result, its production is more economical.
  • the saving in add-on parts to be welded on also results in a weight saving. This in turn has a positive effect on the fuel consumption and the pollutant emissions of a motor vehicle equipped with the axle carrier according to the invention.
  • FIG. 1 shows the production of an axle support 1 for a passenger car, starting from an initial profile in the form of a straight tube 2 with a round cross section.
  • the axle support 1 (FIG. 1E and FIG. 1F) essentially comprises two tubular longitudinal sections 3 which are connected to one another via a central section 4.
  • the central section 4 transmits in particular torsional and bending forces which are directed from the longitudinal sections 3 into the central section 4.
  • forming regions 6 are formed on the axle support 1. These can also be used to attach attachments, for example.
  • the tube 2 is provided in a fixed initial length L A , which is matched to the dimensions of the axle support 1 or to the forming processes carried out during manufacture (FIG. 1A).
  • First bulges 7 are preformed on the tube 2 (FIG. 1B).
  • the preforming is carried out by means of hydraulic internal pressure, the ends 8 being axially pushed at the same time. In this way, profile material is shifted to the areas 6 'to be preformed. In the example shown, these are the zones 7 ', in which the maximum deformation takes place during the later bending process.
  • the preformed tube 2 'thus formed is then subjected to a heat treatment by means of an annealing process.
  • a heat treatment by means of an annealing process.
  • the axis contour 2 ′′ is then created by bending (FIG. 1C). During the bending process, the tube 2 'is under high internal pressure, so that the hydroformed contour is retained. Heat treatment can also follow the bending process.
  • the preforming is carried out in a press tool 11 (see FIGS. 2 and 3).
  • the press tool 11 has two tool halves 12, 13.
  • An axial punch 16, 17 is arranged on each of the two end sides 14, 15.
  • the press tool 11 has bulge openings 18 which are adapted there.
  • counter-cylinders 19 are arranged, the pistons 20 of which are designed to match the contour of the bulges.
  • the tool halves 12, 13 are moved together hydraulically.
  • the tube 2 is closed at both ends 8 by likewise hydraulically moved pistons 21 with correspondingly shaped heads 22.
  • a pressure medium is then applied to the tube 2.
  • the pressure medium is supplied via an internal high-pressure line 23, indicated by dashed lines in FIG. 2, which is led through the pistons 21.
  • the preformed tube 2 ' is then bent.
  • the bending process is shown in Figures 4 and 5.
  • the preformed tube 2 ' is picked up by a bending tool 25.
  • the ends 8 are closed by the adapter 26.
  • the tube 2 ' is then subjected to internal pressure.
  • the center section 4 is fixed by the counter contour 29.
  • the axle contour 2 ′′ preformed in this way is fed to a hydroforming tool 30 after the bending process, in which the final shaping is carried out (FIG. 6).
  • the areas 6 ′ are first flattened in the hydroforming tool, as a result of which the shaping areas 6 receive their configuration.
  • the axis contour 2 ′′ is also slightly flattened on the top in the areas 6 ′ (see also FIG. 7).
  • the axle contour 2 ′′ is then closed in a form-fitting manner by the adapter 31.
  • the final shaping then takes place hydraulically, in which the axle support 1 is calibrated with the required dimensional accuracy. Following this, the assembly openings 9 are punched out while the internal pressure is acting.
EP19950114847 1995-09-21 1995-09-21 Verfahren zur Herstellung eines Achsträgers Expired - Lifetime EP0770435B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59504498T DE59504498D1 (de) 1995-09-21 1995-09-21 Verfahren zur Herstellung eines Achsträgers
ES95114847T ES2124949T3 (es) 1995-09-21 1995-09-21 Procedimiento para fabricar un soporte de eje.
EP19950114847 EP0770435B1 (de) 1995-09-21 1995-09-21 Verfahren zur Herstellung eines Achsträgers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19950114847 EP0770435B1 (de) 1995-09-21 1995-09-21 Verfahren zur Herstellung eines Achsträgers

Publications (2)

Publication Number Publication Date
EP0770435A1 true EP0770435A1 (de) 1997-05-02
EP0770435B1 EP0770435B1 (de) 1998-12-09

Family

ID=8219640

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950114847 Expired - Lifetime EP0770435B1 (de) 1995-09-21 1995-09-21 Verfahren zur Herstellung eines Achsträgers

Country Status (3)

Country Link
EP (1) EP0770435B1 (ja)
DE (1) DE59504498D1 (ja)
ES (1) ES2124949T3 (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2335401A (en) * 1998-03-20 1999-09-22 Budd Co Hydroformed control arm
WO2000001500A1 (de) * 1998-07-02 2000-01-13 Carsten Binder Verfahren und vorrichtung zur herstellung von teilen mit hilfe der innen-hochdruck-umformtechnik
GB2346337A (en) * 1998-12-31 2000-08-09 Dana Corp Method of hydroforming a front axle beam
NL1011330C2 (nl) * 1999-02-17 2000-08-18 Corus Staal Bv Werkwijze voor het vervormen van een dunwandig metalen buisstuk.
WO2001036121A2 (de) * 1999-11-18 2001-05-25 Alcan Technology & Management Ltd. Verfahren zum umformen eines ausgangsprofils od.dgl. werkstückes sowie profil dafür
WO2003013755A1 (fr) * 2001-08-06 2003-02-20 Brigitte Dossmann Procede et dispositif pour courber un tube cylindrique ou analogue

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6453719A (en) * 1987-08-20 1989-03-01 Agency Ind Science Techn Production of bend pipe
WO1991001829A1 (en) * 1989-08-02 1991-02-21 Proprietary Technology, Inc. Means for providing very small bend radii in tube-like structures
DE4017072A1 (de) 1990-05-26 1991-11-28 Benteler Werke Ag Verfahren zum hydraulischen umformen eines rohrfoermigen hohlkoerpers und vorrichtung zur durchfuehrung des verfahrens
EP0497438A1 (de) * 1991-01-28 1992-08-05 MANNESMANN Aktiengesellschaft Verfahren und Vorrichtung zum hydraulischen Aufweiten von rohrförmigen Hohlprofilen
EP0588528A1 (en) * 1992-09-15 1994-03-23 Aquaform Inc Apparatus and method for forming and hydropiercing a tubular frame member

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6453719A (en) * 1987-08-20 1989-03-01 Agency Ind Science Techn Production of bend pipe
WO1991001829A1 (en) * 1989-08-02 1991-02-21 Proprietary Technology, Inc. Means for providing very small bend radii in tube-like structures
DE4017072A1 (de) 1990-05-26 1991-11-28 Benteler Werke Ag Verfahren zum hydraulischen umformen eines rohrfoermigen hohlkoerpers und vorrichtung zur durchfuehrung des verfahrens
EP0497438A1 (de) * 1991-01-28 1992-08-05 MANNESMANN Aktiengesellschaft Verfahren und Vorrichtung zum hydraulischen Aufweiten von rohrförmigen Hohlprofilen
EP0588528A1 (en) * 1992-09-15 1994-03-23 Aquaform Inc Apparatus and method for forming and hydropiercing a tubular frame member

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 244 (M - 834) 7 June 1989 (1989-06-07) *
WT WERKSTATTSTECHNIK, vol. 79, 1989, pages 210 - 214

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2335401A (en) * 1998-03-20 1999-09-22 Budd Co Hydroformed control arm
WO2000001500A1 (de) * 1998-07-02 2000-01-13 Carsten Binder Verfahren und vorrichtung zur herstellung von teilen mit hilfe der innen-hochdruck-umformtechnik
GB2346337A (en) * 1998-12-31 2000-08-09 Dana Corp Method of hydroforming a front axle beam
GB2346337B (en) * 1998-12-31 2002-10-16 Dana Corp Method of hydroforming a front axle beam
NL1011330C2 (nl) * 1999-02-17 2000-08-18 Corus Staal Bv Werkwijze voor het vervormen van een dunwandig metalen buisstuk.
WO2000048762A1 (en) * 1999-02-17 2000-08-24 Corus Staal Bv Process for deforming a piece of thin-walled metal tube
US6766678B1 (en) 1999-02-17 2004-07-27 Dr. Meleghy Gmbh & Co. Kg Process for deforming a piece of thin-walled metal tube
WO2001036121A2 (de) * 1999-11-18 2001-05-25 Alcan Technology & Management Ltd. Verfahren zum umformen eines ausgangsprofils od.dgl. werkstückes sowie profil dafür
WO2001036121A3 (de) * 1999-11-18 2001-11-22 Alusuisse Tech & Man Ag Verfahren zum umformen eines ausgangsprofils od.dgl. werkstückes sowie profil dafür
US6810705B1 (en) 1999-11-18 2004-11-02 Alcan Technology & Management Ag Method for forming an initial profile or a tool of the kind and a profile therefor
WO2003013755A1 (fr) * 2001-08-06 2003-02-20 Brigitte Dossmann Procede et dispositif pour courber un tube cylindrique ou analogue
US7222512B2 (en) 2001-08-06 2007-05-29 Brigitte Dossmann Method and device for bending a cylindrical tube or the like

Also Published As

Publication number Publication date
EP0770435B1 (de) 1998-12-09
DE59504498D1 (de) 1999-01-21
ES2124949T3 (es) 1999-02-16

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