EP1190786B1 - Procédé d'hydroformage de toles et dispositif pour sa mise en oeuvre - Google Patents

Procédé d'hydroformage de toles et dispositif pour sa mise en oeuvre Download PDF

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Publication number
EP1190786B1
EP1190786B1 EP01450017A EP01450017A EP1190786B1 EP 1190786 B1 EP1190786 B1 EP 1190786B1 EP 01450017 A EP01450017 A EP 01450017A EP 01450017 A EP01450017 A EP 01450017A EP 1190786 B1 EP1190786 B1 EP 1190786B1
Authority
EP
European Patent Office
Prior art keywords
punch
blank
blank holder
die
cavity
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.)
Expired - Lifetime
Application number
EP01450017A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1190786A1 (fr
Inventor
Lucien Chevalier
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.)
Airbus Operations SAS
Original Assignee
Airbus Operations SAS
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 Airbus Operations SAS filed Critical Airbus Operations SAS
Publication of EP1190786A1 publication Critical patent/EP1190786A1/fr
Application granted granted Critical
Publication of EP1190786B1 publication Critical patent/EP1190786B1/fr
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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/205—Hydro-mechanical deep-drawing

Definitions

  • the present invention relates to the manufacture of metal elements by deformation by pressure of a fluid, or hydroforming and more particularly the manufacture, by this technique, of sheets.
  • Hydroforming is a well known technique that allows, in one of its main modes of implementation, to deform a sheet maintained on its periphery between a hollow matrix and a blank holder, by depression using a punch of the sheet in the cavity of the matrix, a fluid under pressure, such as water, being fed into the cavity to press the sheet against the punch.
  • a fluid under pressure such as water
  • This forming process allows the realization of bosses and shapes complex. Indeed, the existence of a high back pressure, generated by the fluid present in the matrix makes it possible to strongly press the blank against the punch and faithfully reproduce on it all these bosses and shapes complex.
  • reinforcements may be provided consisting of pieces of the same kind as the blank, which are cut to the desired shape and placed at the places that one wants to reinforce. These parts may be welded in advance or arranged in such a way as to be welded to the diffusion blank, prior to hydroforming, if this technical. This way of operating is appropriate in simple cases, but for complex parts, it requires precise cutting and fixing to suitable places, a large number of reinforcements. A more study precise stress often requires reinforcements to have thicknesses different from each other which complicates the work.
  • the stamping force is significantly higher than the effort strictly necessary for deformation of the material. Indeed, the displacement of the stamping punch assumes a proportional force to section and pressure. The total effort to put in work is the sum of the stamping effort plus the effort needed to defeat the against pressure. The stamping effort can become negligible in front of the back pressure force. It is therefore necessary to use very machines powerful to be able to manufacture parts by a forming process hydraulic.
  • This effect occurs when the games between the punch and the blanks are important. It corresponds to a swallowing of matter caused by the against-pressure prevailing in the cavity of the matrix. Indeed, the back pressure prevailing in the cavity being strong, the material is repelled and insinuates itself into the space between the blanks and the punch. He is then forms a fold of material likely to be pinched during the descent of the punch and thus be weakened. The completed part can possibly be to break the right of this fold, under a constraint imposed during its use normal.
  • the present invention aims precisely to remedy this effect "sock" by proposing a hydroforming process avoiding the formation of folds between blanks and punch.
  • the subject of the invention is a process for hydroforming sheet metal, in which a blank is fixed with a blank-holder on a matrix provided with a cavity for stamping said blank with a punch penetrating the matrix, characterized in that during the phase stamping, the game between punch and blank holder is modified to contain it in a range of values preventing between said punch and die the formation of fold, in function of one and / or the other of the following parameters: fluid pressure in the cavity of the matrix and position of the punch relative to the matrix.
  • control of the game between punch and blank holder is realized by a modulation of the geometry of the parts opposite said punch and said blank holder during stamping, said modulation occurring either during the entire duration of the stamping, ie during an initial phase of said stamping, followed by the establishment of a permanent minimum clearance.
  • only one of the two elements -poin affair and serre-flan- is equipped with a variable geometry part.
  • the method applies to matrices whose cavity is connected or not to a source of fluid, preferably a liquid, of back pressure.
  • the invention also relates to a device for the implementation of the above method, comprising a cavity matrix capable of receiving a stamping punch of a metal blank fixed on the die using of a blank holder, characterized in that it comprises means for modifying the play between punch and blank holder during the stamping operation.
  • FIGS. 1a to 1c illustrate the phenomenon known as "sock effect" inherent to the hydroforming process applied to sheet metal stamping metal.
  • the blank 1 to be shaped is tightened peripherally with the aid of a blank holder 2 around the periphery of a cavity 3 formed in a die 4 and a punch 5 is applied to the blank 1.
  • part 1a of the blank situated between the blank holder 2 and the punch 5 is pushed by the back pressure prevailing in the cavity 3 thus causing a ply blank due to excess material between the blank holder and the punch.
  • the aim of the invention is to remedy this drawback by proposing a method of hydroforming avoiding, at the beginning of stamping, the creation of surplus material between blank and punch leading to the formation of a fold.
  • This adaptation is made taking into account the morphology of the blank and punch, the nature and thickness of the blank and in function against the pressure exerted on the face of the blank opposite the punch and / or the position of the punch relative to the matrix.
  • FIG. 2 illustrates a first embodiment of the method of the invention according to which the clearance between the blank holder 2 'and the punch 5' is modulated by a modification of the geometry of the blank holder, particularly in depending on the stamping depth of the punch 5 '.
  • blank holder 2 ' is meant a device consisting of one or more associated parts in order to ensure the firm sealing of the periphery of the flan 1 against the periphery of the cavity 3 'of the matrix 4' during stamping.
  • the 2 'blank holder so that it has a variable geometry in realizing said blank holder 2 'in the form of an assembly of a fixed part 2'a and a part mobile 2'b, interposed between the fixed part 2'a and the blank 1 and likely to sliding in a plane parallel to that of the blank 1.
  • Said mobile part 2'b is for example constituted of a flat segment, extending over at least part of the periphery of the cavity 3 'and movable following the double arrow F, so as to get closer or move away from the punch 5 ', over a suitable distance, by means provided for that purpose and symbolized in 6.
  • the moving part 2'b of the blank holder 2 ' is brought closer to the punch 5' to form a reduced clearance between the portion 5'a of the punch and the slice in look, beveled in correspondence with the average inclination of the part 5'a, of the mobile segment 2'b.
  • This game is of course scalable depending on the instantaneous position punch 5 'relative to the matrix 4' and will be driven by a withdrawal progressive, programmed, 2'b segment as and when depressed punch 5 'in the die 4'.
  • this game can be kept constant and, for example, equal to the minimum clearance j between the blank holder 2 'and the side of the punch 5', but can be modified, continuously or in increments, while being contained in a predetermined range of values.
  • the maximum deformation of the blank in the zone between the blank holder 2 'and punch 5 ' will be a small wave 1b of the type shown in the figure 2 and which is not subject to degradation by clamping and rolling between blanks and punch as in the case of Figures 1a to 1c.
  • the sheet thus formed will therefore have no weakened zone.
  • the displacement of the part 2'b concomitant with the descent of punch 5 ' can be achieved by servoing the part 2'b to the race punch 5 'or simply by mechanical pushing by the punch 5' of Part 2'b using an appropriate means.
  • FIG. 3 illustrates another embodiment of the method of the invention of giving the part of the punch 5 "opposite the blank holder 2 "a variable geometry, said blank holder 2" being of configuration fixed.
  • the punch 5 is provided peripherally with a plurality of housings each receiving a retractable cam 7 hinged about an axis 8 parallel to the plane of the blank 1.
  • Each cam 7 is retractable inside the punch 5 "and its face 7a is shaped in correspondence with that of the punch so in the final stamping position, said outer face 7a of the cam is in the continuity of the face 5 "a punch to give the blank 1 the shape planned.
  • the position of the cams 7 is determined in correspondence with the position of the punch 5 "relative to the matrix 4 '.
  • Correspondence can be ensured as represented by mechanical pushing of the cam 7 as and when the descent of the punch 5 ", via a return slide 9 having a face 10 inclined at 45 ° cooperating with a corresponding inclined face 11 shaped on the blank holder 2 "and a rotation control arm 12 of the cam 7, via a gear system (not shown).
  • the punch 5 "and the return slide 9 are pressed simultaneously against the blank 1 and the blank holder 2 "by the upper plate 13 of the press.
  • the cam 7 is at the maximum output to reduce the clearance between punch and blank holder, which play is, as indicated above in relation to Figure 2, maximum at this stage procedure.
  • the face 10 of the slider is then in the upper part of the face fixed 11.
  • This game between 2 "and 5" punch can be contained in a determined range of values, the game at the end of the punch stroke being be the minimum clearance between 2 "blank and 5" punch.
  • Figure 3 shows the device of Figure 3 at the end of stamping.
  • the cam 7 can, by sliding on the side opposite the 2 "blanket, get up as the punch goes down.
  • the cam 7 has an extension in the direction 2 "flank forming a finger cooperating with the face of the blank forming cam.
  • FIG. 4 illustrates yet another embodiment of the method of the invention to change the geometry of the part of the punch 5 '' 'in look at the 2 '' 'blanket using an inflatable bladder 14 housed inside punch on its periphery, in a suitable annular housing.
  • the bladder 14 is connected by a pipe 16 to a source of fluid under pressure, preferably a liquid, and is disposed in the housing 15 so as to protrude from the front face 5 "'of the punch in a manner controlled by the pressure of the fluid sent into the bladder.
  • a source of fluid under pressure preferably a liquid
  • the game between punch 5 '' 'and blank holder 2' '' at the height of the blank 1 is, as illustrated by the figure 4, much more important than the minimum game j.
  • This game is reduced substantially by sufficiently inflating the bladder 14 so that it overflows of its housing 15 to substitute its projecting portion 14a for punch 5 '' 'to push back the blank and throttle the passage between blanks 2' '' and 5 '' 'punch.
  • the bladder 14 whose pressure of the supply fluid is slaved to the displacement of said punch or possibly at the pressure prevailing in the cavity 3 ', retracts to completely retract into its housing 15, its portion 14a flush with the face surrounding 5 "'has punch.
  • Figure 4 shows the device of Figure 4 at the end of stamping.
  • the invention is obviously not limited to the embodiments represented and described above, but on the contrary covers all variants, in particular as regards the means for creating a game adjustable in spacing between one of the two bodies-side-blank and punch-in taking one of them as a fixed reference of the game and configuring the other with a variable geometry controlled, enslaved or linked in particular to the punch stroke and / or pressure in the die cavity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Chemical Vapour Deposition (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
EP01450017A 2000-09-26 2001-09-25 Procédé d'hydroformage de toles et dispositif pour sa mise en oeuvre Expired - Lifetime EP1190786B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0012208 2000-09-26
FR0012208A FR2814387B1 (fr) 2000-09-26 2000-09-26 Procede d'hydroformage de toles et dispositif pour sa mise en oeuvre

Publications (2)

Publication Number Publication Date
EP1190786A1 EP1190786A1 (fr) 2002-03-27
EP1190786B1 true EP1190786B1 (fr) 2004-10-13

Family

ID=8854667

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01450017A Expired - Lifetime EP1190786B1 (fr) 2000-09-26 2001-09-25 Procédé d'hydroformage de toles et dispositif pour sa mise en oeuvre

Country Status (7)

Country Link
US (1) US6588244B2 (es)
EP (1) EP1190786B1 (es)
AT (1) ATE279275T1 (es)
CA (1) CA2357854C (es)
DE (1) DE60106362T2 (es)
ES (1) ES2230255T3 (es)
FR (1) FR2814387B1 (es)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8505258B2 (en) 2000-08-17 2013-08-13 Industrial Origami, Inc. Load-bearing three-dimensional structure
DE10334483B4 (de) * 2003-07-29 2006-09-28 Daimlerchrysler Ag Verfahren und Ziehwerkzeug zum Herstellen eines Blechteils aus einer Platine
CN101233286A (zh) 2005-03-17 2008-07-30 奥里加米工业股份有限公司 精确折叠、高强度、耐疲劳的结构以及其板材
US7672816B1 (en) 2006-05-17 2010-03-02 Textron Innovations Inc. Wrinkle-predicting process for hydroforming
DE102006040893B3 (de) * 2006-08-31 2008-01-10 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines Blechbauteils für Kraftfahrzeuge
TW200833434A (en) * 2006-09-04 2008-08-16 Ind Origami Inc Apparatus for forming large-radii curved surfaces and small-radii creases in sheet material
WO2008052174A2 (en) 2006-10-26 2008-05-02 Industrial Origami, Inc. Forming three dimensional object
US20090158580A1 (en) * 2007-06-18 2009-06-25 Precision Valve Corporation Method of making aerosol valve mounting cups and resultant cups
US8118197B2 (en) * 2007-06-18 2012-02-21 Precision Valve Corporation Method of making aerosol valve mounting cups and resultant cups
CN101700549B (zh) * 2009-08-27 2013-01-09 四川宁江山川机械有限责任公司 减震器弹簧盘成型工艺及其反引伸成型模
DE102009056315A1 (de) * 2009-12-01 2011-06-09 GM Global Technology Operations LLC, ( n. d. Ges. d. Staates Delaware ), Detroit Streckziehvorrichtung und Verfahren zum Streckziehen eines Werkstücks sowie streckgezogenes Teil
CN102189175A (zh) * 2010-03-09 2011-09-21 财团法人金属工业研究发展中心 用以制造金属壳的模具以及金属壳的制造方法
US8936164B2 (en) 2012-07-06 2015-01-20 Industrial Origami, Inc. Solar panel rack
US10486216B2 (en) 2016-10-17 2019-11-26 Ford Motor Company Draw die and binder lock

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3344646A (en) * 1961-03-15 1967-10-03 Reynolds Metals Co Method for making thin metal sheet tapered receptacles
JPS57134219A (en) * 1981-02-13 1982-08-19 Nissan Motor Co Ltd Material holding device for press die for bulging
US5263354A (en) * 1985-03-15 1993-11-23 Saunders William T Drawn can body methods, apparatus and products
FR2647373B1 (fr) * 1989-05-26 1993-12-17 Dassault Breguet Aviation Procede de formage par deformation par pression de fluide
FR2723867B1 (fr) * 1994-08-26 1996-09-20 Commissariat Energie Atomique Procede d'emboutissage hydraulique a volume constant
DE19860851A1 (de) * 1998-12-31 2000-07-06 Kuka Werkzeugbau Schwarzenberg Verfahren und Vorrichtung zum Formen von Formteilen

Also Published As

Publication number Publication date
DE60106362T2 (de) 2005-10-20
ATE279275T1 (de) 2004-10-15
FR2814387A1 (fr) 2002-03-29
CA2357854A1 (fr) 2002-03-26
US6588244B2 (en) 2003-07-08
FR2814387B1 (fr) 2002-12-06
ES2230255T3 (es) 2005-05-01
EP1190786A1 (fr) 2002-03-27
DE60106362D1 (de) 2004-11-18
CA2357854C (fr) 2008-11-18
US20020035859A1 (en) 2002-03-28

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