US20070157692A1 - Method and device for producing workpieces by means of internal high pressure forming - Google Patents

Method and device for producing workpieces by means of internal high pressure forming Download PDF

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Publication number
US20070157692A1
US20070157692A1 US10/577,684 US57768404A US2007157692A1 US 20070157692 A1 US20070157692 A1 US 20070157692A1 US 57768404 A US57768404 A US 57768404A US 2007157692 A1 US2007157692 A1 US 2007157692A1
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US
United States
Prior art keywords
workpieces
blank
forming
parting
cutting edges
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
Application number
US10/577,684
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English (en)
Inventor
Thomas Aue
Stefan Schwarz
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.)
Daimler AG
Original Assignee
DaimlerChrysler 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 filed Critical DaimlerChrysler AG
Assigned to DAIMLERCHRYSLER AG reassignment DAIMLERCHRYSLER AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AUE, THOMAS, SCHWARZ, STEFAN
Publication of US20070157692A1 publication Critical patent/US20070157692A1/en
Abandoned 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
    • B21D26/021—Deforming sheet bodies
    • B21D26/023—Deforming sheet bodies including an additional treatment performed by fluid pressure, e.g. perforating
    • 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
    • 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
    • B21D26/021—Deforming sheet bodies
    • B21D26/027—Means for controlling fluid parameters, e.g. pressure or temperature
    • 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
    • B21D26/035—Deforming tubular bodies including an additional treatment performed by fluid pressure, e.g. perforating
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes

Definitions

  • the present invention relates to a method and a device for simultaneously producing at least two workpieces, separated from one another, by means of internal high pressure forming or hydroforming.
  • the internal high pressure forming process is based on inserting a blank in the form of a hollow profile, for example a tube, into a forming tool, in sealing off the blank on both sides and in applying an internal high pressure to it in such a way that the blank nestles against a negative mold, at a distance from it, of the forming tool and thus assumes the contours of said mold.
  • hollow bodies can be produced which on the one hand may have a complicated shape but on the other hand, at high strength, have a small wall thickness and thus a low weight.
  • German patent document DE 197 16 816 C2 discloses a method and a device of the type mentioned at the beginning.
  • a blank is inserted into a forming tool which, with its inner wall, has at least two negative molds for in each case one of the workpieces and also at least one parting gap.
  • This parting gap is arranged between two respective negative molds, extends all round in the circumferential direction of the workpieces and is defined by two spaced-apart cutting edges.
  • a tool part Arranged in the respective parting gap in the known device is a tool part which can be positioned in the parting gap relative to the workpiece.
  • the tool part is displaced toward the interior of the forming tool to such an extent that an inner contour of the tool part terminates flush with the cutting edges, so that the latter are sunk in the inner wall of the forming tool and are therefore inactive.
  • the forming of the blank in the forming tool is effected with a calibrating pressure, which is selected in such a way that the blank in the negative molds is in full contact with the inner wall and therefore also with the inner contour of the tool part closing the parting gap.
  • a parting operation is effected, for which the pressure in the hollow body is increased above the calibrating pressure.
  • the known device or the known method therefore works with two successive phases.
  • the workpieces are shaped from the blank in a conventional manner, the workpieces still being in one piece with one another after the forming.
  • the subsequent second phase by means of an additionally increased internal pressure, the two workpieces are then parted by releasing cutting edges.
  • the outlay for providing workpiece parts which withstand the calibrating pressure and do not release the cutting edges until at a higher parting pressure is relatively high in this case.
  • German patent document DE — 197 47 607 A1 discloses a method and a device for perforating a workpiece, its one side being subjected to a pressure medium under high pressure and its other side being subjected to the action of a punch guided in a tool, and this punch releasing an encircling cutting edge which is formed on the tool and at which the wall is cut under the effect of an increasing high pressure.
  • the present invention deals with the problem of specifying an improved embodiment for simultaneously producing at least two workpieces, separated from one another, by means of internal high pressure forming or hydroforming, which improved embodiment can be realized in particular in a more cost-effective manner.
  • the invention is based on the general idea of already arranging the cutting edges in an exposed manner during the forming of the blank and of carrying out the forming in such a way that the workpieces are parted at the same time.
  • the parting of the workpieces is integrated in the forming.
  • the invention utilizes the surprising knowledge that a workpiece part which closes the parting gap and produces a sunk arrangement of the cutting edges is not necessary for the forming of the blank.
  • such tool parts for closing the parting gap are consequently dispensed with. This results in a simplified and more cost-effective construction for the forming tool.
  • a gap width of the parting gap is dimensioned in such a way that the workpieces are parted at the calibrating pressure, at which the blank is in full contact with the inner wall in the negative molds.
  • the invention in principle pursues a different way of designing the method parameters and the forming tool.
  • the parting gap is provided and dimensioned in the forming tool in such a way that the desired parting of the at least two workpieces can thus be carried out with a corresponding increase in internal pressure.
  • the parting gap is closed by means of a suitable tool part for forming the blank.
  • the holding forces for positioning the workpiece part are selected as a function of the calibrating pressure, which is required for the proper forming of the blank, in such a way that the workpiece part is not adjusted at the calibrating pressure and the cutting edges cannot be exposed during the forming.
  • a high parting pressure is then selected that the tool part can be displaced into the gap, the cutting edges can be exposed and the desired section between the two shaped workpieces can be cut out.
  • the gap width in the case of the invention is selected as a function of the calibrating pressure, to be precise in such a way that the section between the two workpieces is cut out at the same time at the calibrating pressure.
  • the parting gap is not dimensioned arbitrarily or as a function of geometrical constraints which result from the positioning of the negative molds in the forming tool, but rather as a function of the calibrating pressure. Accordingly, the positioning of the negative molds inside the forming tool depends on the parting gap determined, and not the other way round.
  • FIGS. 1 to 3 show sectional views through a forming tool in accordance with an embodiment of the present invention in the region of a parting gap in different states of a production process.
  • a forming and parting device 1 comprises a forming tool 2 , which is only partly shown here and has an inner wall 3 , likewise only partly shown.
  • a forming tool 2 Formed on or in this inner wall 3 are at least two negative molds 4 and 5 , which each serve to produce a workpiece 6 or 7 , respectively, according to the internal high pressure forming or hydroforming process.
  • Formed in the inner wall 3 between two respective negative molds 4 , 5 is a parting gap 8 which extends all round in the circumferential direction of the workpieces 6 , 7 .
  • the parting gap 8 defines the two negative molds 4 , 5 and is in turn defined by two spaced-apart cutting edges 9 and 10 . In this case, the cutting edges 9 and 10 define a gap width 11 of the parting gap 8 .
  • the cutting edges 9 , 10 are arranged in an exposed manner on the inner wall 3 . That is to say that the parting gap 8 is open and the cutting edges 9 , 10 interrupt the inner wall 3 of the forming tool 2 .
  • a blank 12 which normally has a hollow profile, can be inserted into the forming tool 2 .
  • the forming and parting device 1 has a feed device (not shown here), by means of which a suitable pressure medium, expediently a liquid, in particular a hydraulic oil, can be delivered into the blank 12 and can be acted upon with an appropriate high pressure.
  • a suitable pressure medium expediently a liquid, in particular a hydraulic oil
  • a corresponding control system which controls the sequence of the forming and parting operation is regularly provided.
  • the forming and parting method according to the invention or the forming and parting device 1 according to the invention works as follows:
  • FIG. 2 shows that instant or state of the forming and parting operation at which or in which the blank 12 is widened to such an extent that an outer contour 14 of the blank 12 comes into full surface contact with the inner contours of the negative molds 4 , 5 .
  • Full contact of the outer contour 14 of the blank 12 with the inner contours of the negative molds 4 , 5 is reliably achieved at a calibrating pressure P K .
  • the workpieces 6 , 7 are therefore shaped in the negative molds 4 , 5 .
  • the shaped workpieces 6 , 7 are still in one piece with one another or are connected to one another via a section 15 arranged in between.
  • the parting gap 8 is matched to the calibrating pressure P K in such a way that, at the calibrating pressure P K , said section 14 is displaced according to FIG. 3 into the gap 8 and is accordingly cut free by the cutting edges 9 , 10 .
  • the section 15 is shaped so as to be closed all round, in a complimentary manner to the parting gap 8 .
  • the section 15 arranged between the workpieces 6 , 7 is cut out, which at the same time leads to parting of the two workpieces 6 , 7 .
  • the workpieces 6 , 7 then lie as separate, finish-formed components in the forming tool 2 .
  • a combined forming and parting operation is obtained for the simultaneous production of at least the two workpieces 6 , 7 .
  • the forming/parting device 1 has a simpler construction, so that it can be produced more cost-effectively.
  • the calibrating pressure P K which is required in order to bring the blank 12 , with its outer side 14 , into full contact with the negative molds 4 , 5 is determined.
  • the wall thickness 13 remaining in the hollow profile after the forming is determined.
  • the shearing force that is required for cutting off the section 15 from the workpieces 6 , 7 at the cutting edges 9 , 10 can then be calculated from the residual wall thickness.
  • the requisite gap width 11 at which the calibrating pressure P K cuts out the section 15 can then be calculated with reference to the calibrating pressure P K and the predetermined circumference of the workpieces 6 , 7 in the region of the parting gap 8 .
  • the position of the negative molds 4 , 5 on both sides of the parting gap 8 in the forming tool 2 is thus obtained, provided the negative molds 4 , 5 each start or end at one of the cutting edges 9 , 10 .
  • the parting gap 8 may also be dimensioned in such a way that the calibrating pressure P K is not sufficient to drive the section 15 into the parting gap 8 or to cut the section 15 out.
  • the internal high pressure is then correspondingly increased above the calibrating pressure P K .
US10/577,684 2003-10-28 2004-09-10 Method and device for producing workpieces by means of internal high pressure forming Abandoned US20070157692A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10350154A DE10350154B3 (de) 2003-10-28 2003-10-28 Verfahren und Vorrichtung zum Herstellen von Werkstücken mittels Innenhochdruckumformung
DE10350154.1 2003-10-28
PCT/EP2004/010106 WO2005051561A1 (de) 2003-10-28 2004-09-10 Verfahren und vorrichtung zum herstellen von werkstücken mittels innenhochdruckumformung

Publications (1)

Publication Number Publication Date
US20070157692A1 true US20070157692A1 (en) 2007-07-12

Family

ID=34258758

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/577,684 Abandoned US20070157692A1 (en) 2003-10-28 2004-09-10 Method and device for producing workpieces by means of internal high pressure forming

Country Status (6)

Country Link
US (1) US20070157692A1 (de)
EP (1) EP1677922A1 (de)
JP (1) JP2007533461A (de)
CA (1) CA2543691A1 (de)
DE (1) DE10350154B3 (de)
WO (1) WO2005051561A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090038428A1 (en) * 2005-02-15 2009-02-12 Nsk Ltd. Metal Member With Through Hole And Manufacturing Method Therefor
US20160001345A1 (en) * 2014-04-30 2016-01-07 Ford Global Technologies, Llc Value stream process for forming vehicle rails from extruded aluminum tubes

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006005123U1 (de) * 2006-03-27 2007-08-09 Fgu Forschungsgesellschaft Umformtechnik M.B.H. Vorrichtung zum Trennen oder Lochen eines nach dem Innenhochdruckumformen hergestellten Werkstückes
EP2296835B1 (de) * 2009-08-05 2014-01-15 GI.DI. Meccanica S.p.A. Verfahren zur erzeugung einer öffnung in einem hohlkörperelement und vorrichtung zur durchfürung des verfahrens

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3383888A (en) * 1963-12-17 1968-05-21 Continental Can Co Magnetic cutoff guiding and positioning of tubing
US3786662A (en) * 1970-08-31 1974-01-22 Continental Can Co Electropneumatic or electrohydraulic cutoff, flanging and re-forming of tubing
US5460026A (en) * 1993-07-02 1995-10-24 Wilhelm Schafer Maschinenbau Gmbh & Co. Method of and apparatus for the cutting of an opening in a hollow body
US5941112A (en) * 1998-11-23 1999-08-24 General Motors Corporation Method and apparatus for hydrotrimming and hydroshearing
US6178796B1 (en) * 1998-06-01 2001-01-30 Flow Holdings Gmbh (Sagl) Llc Device and method for shaping flat articles
US6513359B1 (en) * 1998-10-01 2003-02-04 Carsten Binder Fluid form
US6708542B1 (en) * 1999-06-14 2004-03-23 Pulsar Welding Ltd. Electromagnetic and/or electrohydraulic forming of a metal plate
US6751994B2 (en) * 2002-05-28 2004-06-22 Magna International Inc. Method and apparatus for forming a structural member
US7155948B2 (en) * 2002-05-15 2007-01-02 Avure Technologies Ab Forming tool

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2043180C1 (ru) * 1991-06-03 1995-09-10 Авиационный научно-промышленный комплекс "ОКБ Сухого" Устройство для магнитно-импульсной штамповки трубчатых заготовок
DE19716816C2 (de) * 1997-04-22 1999-05-27 Forschungsges Umformtechnik Verfahren und Vorrichtung zum Trennen eines nach dem Innenhochdruck-Umformverfahren hergestellten Hohlkörpers
DE19911125C1 (de) * 1999-03-12 2000-11-16 Forschungsges Umformtechnik Verfahren und Vorrichtung zum Trennen oder Lochen eines Werkstücks unter Einfluß eines unter Hochdruck stehenden Druckmediums
DE19935714B4 (de) * 1999-07-29 2005-06-23 Audi Ag Vorrichtung und Verfahren zum Trennen oder Lochen eines Werkstückes

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3383888A (en) * 1963-12-17 1968-05-21 Continental Can Co Magnetic cutoff guiding and positioning of tubing
US3786662A (en) * 1970-08-31 1974-01-22 Continental Can Co Electropneumatic or electrohydraulic cutoff, flanging and re-forming of tubing
US5460026A (en) * 1993-07-02 1995-10-24 Wilhelm Schafer Maschinenbau Gmbh & Co. Method of and apparatus for the cutting of an opening in a hollow body
US6178796B1 (en) * 1998-06-01 2001-01-30 Flow Holdings Gmbh (Sagl) Llc Device and method for shaping flat articles
US6513359B1 (en) * 1998-10-01 2003-02-04 Carsten Binder Fluid form
US5941112A (en) * 1998-11-23 1999-08-24 General Motors Corporation Method and apparatus for hydrotrimming and hydroshearing
US6708542B1 (en) * 1999-06-14 2004-03-23 Pulsar Welding Ltd. Electromagnetic and/or electrohydraulic forming of a metal plate
US7155948B2 (en) * 2002-05-15 2007-01-02 Avure Technologies Ab Forming tool
US6751994B2 (en) * 2002-05-28 2004-06-22 Magna International Inc. Method and apparatus for forming a structural member

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090038428A1 (en) * 2005-02-15 2009-02-12 Nsk Ltd. Metal Member With Through Hole And Manufacturing Method Therefor
US8459077B2 (en) * 2005-02-15 2013-06-11 Nsk Ltd. Manufacturing method for metal member with through hole
US20160001345A1 (en) * 2014-04-30 2016-01-07 Ford Global Technologies, Llc Value stream process for forming vehicle rails from extruded aluminum tubes
US10086422B2 (en) * 2014-04-30 2018-10-02 Ford Global Technologies, Llc Value stream process for forming vehicle rails from extruded aluminum tubes

Also Published As

Publication number Publication date
WO2005051561A1 (de) 2005-06-09
DE10350154B3 (de) 2005-04-07
EP1677922A1 (de) 2006-07-12
JP2007533461A (ja) 2007-11-22
CA2543691A1 (en) 2005-06-09

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AS Assignment

Owner name: DAIMLERCHRYSLER AG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:AUE, THOMAS;SCHWARZ, STEFAN;REEL/FRAME:019057/0018;SIGNING DATES FROM 20070211 TO 20070213

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION