EP0376808B1 - Verfahren und Vorrichtung zum Tiefziehen von Blattmaterialien mit einem deformierbaren Stempel unter einem Tauchkolben - Google Patents

Verfahren und Vorrichtung zum Tiefziehen von Blattmaterialien mit einem deformierbaren Stempel unter einem Tauchkolben Download PDF

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Publication number
EP0376808B1
EP0376808B1 EP89403589A EP89403589A EP0376808B1 EP 0376808 B1 EP0376808 B1 EP 0376808B1 EP 89403589 A EP89403589 A EP 89403589A EP 89403589 A EP89403589 A EP 89403589A EP 0376808 B1 EP0376808 B1 EP 0376808B1
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EP
European Patent Office
Prior art keywords
blank
die
sheet
elastic cushion
cushion
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
EP89403589A
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English (en)
French (fr)
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EP0376808A1 (de
Inventor
Gabriel De Smet
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Isoform SNC
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Isoform SNC
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Publication date
Application filed by Isoform SNC filed Critical Isoform SNC
Priority to AT89403589T priority Critical patent/ATE97352T1/de
Publication of EP0376808A1 publication Critical patent/EP0376808A1/de
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Publication of EP0376808B1 publication Critical patent/EP0376808B1/de
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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
    • B21D22/10—Stamping using yieldable or resilient pads
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49805—Shaping by direct application of fluent pressure

Definitions

  • the subject of the present invention is a method and a device for stamping sheet materials, in particular extra-thin sheet blanks of large dimensions usable for example in the automotive industry, and / or comprising complex shapes, with deformable punch. under diver.
  • the stamping of large and complex parts is generally done with double effect presses.
  • These machines essentially comprise a fixed table which receives a matrix and two independent slides: an external slide carrying a blank holder and a central slide called a plunger carrying a punch.
  • an external slide carrying a blank holder and a central slide called a plunger carrying a punch.
  • the external slide and the blank holder go down and maintain a tightening of the sheet blank
  • the punch under the action of the central slide, goes down quickly until it comes into contact with the sheet blank and continues its descent during the stamping phase, and finally the central slide and the external slide go up practically at the same time.
  • a drawing process is known on an elastic cushion.
  • the sheet blank to be formed is placed on an elastic cushion, an external slide is applied supporting a blank holder on the peripheral part of the sheet blank so as to cause the mass of the elastic cushion to creep to deform the central part of the sheet blank by giving it at the end of the preforming step a surface substantially equal to the surface of the finished part to obtain, then apply with a central slide a punch on the central part of the sheet blank to permanently shape the part,
  • a drawing process which simultaneously implements drawing on elastomer and drawing under fluid pressure.
  • the elastomer element, placed above the sheet blank is not only made of an elastomer mass, but also comprises a fluid-inflatable bladder, which resembles a technique hydroforming.
  • this method does not include a first preform step in which the preformed sheet blank acquires a surface substantially equal to the surface of the finished part to be obtained.
  • document SU-A-1271 614 which is considered to be the closest prior art, is known for a process for stamping sheet materials in which, during a first step, action of a cushion of elastic material a peripheral deformation of the blank in the cavity of a matrix so as to form, peripherally, a narrow projection, the central part of the blank conforming to the rounded shape of an insert of elastic material cooperating with a vertically movable punch forming the bottom of the die.
  • the punch is released in order to carry out the final shaping of the part.
  • a tear in the sheet blank occurs if it is formed by an extra-thin sheet, the localized pulls being considerable.
  • the present invention aims to present a new process which, while preserving the efficiency and longevity of the cushion of elastic material, makes it possible to obtain deep-drawn parts of medium depth, but of large surface area, such as automobile parts, the parts of which power plants are practically never forms of revolution, but represent complex non-developable forms, without suction problem and incorporating other advantages which will be developed below.
  • the subject of the invention is therefore a process for stamping sheet materials, in particular sheet metal, according to the combination of characteristics defined in claim 1.
  • the invention also relates to a device for stamping sheet materials, in particular sheet blanks according to the combination of characteristics set out in claim 2.
  • the stamping device shown in FIG. 1 comprises a base 1, the central part of which constitutes a housing for a matrix 3 possibly made in one piece with the base 1 and which comprises on its upper part an imprint corresponding to the profile of the finished part to get.
  • the base 1 comprises on the one hand an internal part forming a blank holder 2 situated at a level higher than the imprint of the matrix 3 and on the other hand an upper part constituting an area 2a for falling from the edge of the sheet blank 20.
  • the matrix 3 includes a cavity 4 into which a sliding core 5 penetrates. in the latter and whose upper face completes the imprint of the matrix 3 to obtain the profile of the finished part.
  • the core 5 is movable and cooperates with a member 6 for regulating the movement of said core which can be constituted for example by a multi-blade brake, a spring or even a jack, or any other appropriate system.
  • the stamping device comprises a body 7, the lower part of which constitutes an upper peripheral blank holder 9.
  • the upper peripheral blank holder 9 has external dimensions smaller than those practiced on the base 1, so that said upper blank holder 9 can penetrate into said base to reach the lower blank holder 2.
  • the body 7 comprises a well 10 into which a punch 11 penetrates.
  • This punch 11 comprises a cushion 12 made of elastic material and has a plate 13 at its upper part. Furthermore, the body 7 is provided on its periphery with two superimposed flanges, 14 and 15 respectively.
  • the first flange 14 supports jacks 16, each rod of which crosses the second flange 15 through orifices 17 and cooperates with the plate 13 of the punch 11 to constitute a system for raising the punch at the end of the shaping step and possibly of adjusting the pressure of the upper blank holder 9.
  • the sheet blank 20 has in localized areas cutouts forming horns 20a which, when the blank is positioned on the upper face of the base 1, rest on the determined areas 2a of edge falling, as shown in FIG. 2.
  • the edge falling is therefore carried out in limited areas of the peripheral edge of the sheet blank corresponding to areas 2a of the upper part of the base 1 as will be seen later.
  • the sheet blank 20 is formed in the following manner.
  • the sheet blank 20 is placed on the upper face of the base 1 which rests via the horns 20a only on the zones 2a (FIG. 3).
  • the core 5 protrudes above the imprint of the matrix 3 and the member 6 for regulating the displacement of said core is locked by a suitable device not shown.
  • FIG. 6 represents the stage of final shaping of the part.
  • the plunger 22 descends to its low position and causes, via the elastic cushion 12, the final shaping of the preformed part during the first part of the descent.
  • the member 6 is unlocked so that the movable core 5 retracts so as to release the developed surfaces of sheet metal necessary for the conformation of the finished part.
  • the edges of the sheet blank 20 are held while sliding between the lower blank clamp 2 and the upper blank clamp 9, and the height of the fallen edges of said blank in the localized zones 2a decreases.
  • the plate 13 of the punch 11 compresses the jacks 16, which also has the effect of adjusting the force of the upper blank holder 9 on the peripheral edge of the sheet blank 20.
  • the step of releasing the formed part is first carried out by raising the plunger 22, which releases the punch 11. Under the effect of the jacks 16, the punch 11 rises, driving the elastic cushion 12. The detachment of the elastic cushion 12 of the formed part takes place from the periphery towards the center, so that the air penetrates between the part and the external face of the cushion, thus avoiding the effects of suction.
  • the external slide 21 rises and drives the body 7 by definitively releasing the formed part which can have a shape as shown in FIG. 1.
  • the base 1 carrying the matrix 3 is vertically movable and, for this purpose, rests on a sole 30 which cooperates with a member 31 for regulating the movement of said base, consisting for example of a multi-blade brake, a spring, a jack or any other suitable system.
  • the matrix 3 comprises a cavity 4 into which a core 32 penetrates, the upper face of which completes the imprint of the matrix 3 to obtain the finished part.
  • the core 32 is fixed.
  • the member 31 for regulating the movement of the base 1 is unlocked so as to release the developed surfaces of sheet metal, by lowering the matrix 3 during this shaping operation.
  • the base 1 is fixed and it is the whole of the matrix 3 which is movable vertically.
  • the matrix 3 cooperates with a member 31 for regulating the movement of said matrix, consisting for example of a multi-blade brake, a spring, a jack or any other suitable system.
  • the part is formed identically to the previous variants.
  • the stamping device comprises means for absorbing the excess volume of the elastic cushion 12 relative to that determined by the surface of the finished part to be obtained.
  • the descent of the elastic cushion 12 deforms the central part of the sheet blank, while giving it, at the end of the preforming step, a surface substantially equal to the surface of the part. finished getting.
  • Continued descent of the elastic cushion 12 for the final shaping of the sheet blank causes an increase in pressure in the cushion and, depending on the part to be produced, possibly a difference in volume of said cushion between the preforming step and the 'conformation step.
  • the punch 11 ( Figure 12) has an upper part 11a and a lower part 11b between which are interposed springs 40 or any other equivalent system. These springs 40 compress above a certain pressure to absorb the excess volume of the elastic cushion.
  • the means for absorbing the excess volume of the elastic cushion can also be arranged in the vicinity of said cushion, as for example in the side walls of the body 7.
  • curve I represents the cycle of the external slide 21 and curve II represents the cycle of the plunger 22.
  • the travel of the external slide 21 takes place over a distance A and the travel of the plunger 22 over a distance distance B.
  • the elastic cushion has a constant volume and can be constituted by a deformable and incompressible material possibly placed in an envelope. This material can be an elastomer or any product meeting these conditions.
  • sheet must be given a general meaning of a thin plate of sheet material without wanting to limit its scope to metal products.
  • An advantage of the method and the device of the present invention lies in the increase, on the same double-acting press, of the possible dimensions of the finished stamped part, compared with the stamping solution on elastic cushion developed in the FR-A -2,564,339 and FR-A-2,590,814.
  • volume of the elastic cushion is smaller than in the solutions mentioned above.
  • the spatial presentation of the finished part is similar to that encountered in conventional stamping and allows mechanization of subsequent operations requiring no change of equipment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Claims (8)

  1. Verfahren zum Tiefziehen von Blattmaterialien, insbesondere von Blechen, auf einer Presse mittels eines Puffers (12) aus elastisch deformierbarem und nicht zusammendrückbarem Material, gemäß dem man ein Blechscheibe zum Ziehen (20), die geformt werden soll, auf einem Träger anordnet, dessen Ümfangsteil einen unteren Blechhalter (2) und dessen Mittelteil eine Matrize (3) bildet, und zwar ein Verfahren, gemäß dem man in einem ersten Schritt unter der Wirkung des Tauchkolbens (22) den elastischen Puffer (12), der einen deformierbaren Stempel bildet, auf die Blechscheibe zum Ziehen aufsetzt, um die Vorformung der Blechscheibe (20) durchzuführen, und gemäß dem man in einem zweiten Schritt immer noch unter der Wirkung des Tauchkolbens (22) das Absenken des elastischen Puffers (12) fortführt, dadurch gekennzeichnet, daß :
    - man unter der Wirkung eines äußeren Pressenstempels (21) einen oberen Blechhalter (9) auf dem Umfangsteil der Blechscheibe zum Ziehen (20) aufsetzt,
    - man während eines ersten Abschnittes den Umfangsteil der Blechscheibe zum Ziehen (20) in Bereichen mit starker Einschnürung, zwischen entsprechenden Bereichen (2a) des unteren Blechhalters (2) und dem oberen Blechhalter (9) hält,
    - man die Vorformung der Blechscheibe zum Ziehen (20) durchführt, indem man Zugbeanspruchungen über die ganze Flache der Scheibe ausübt und man ihre Verschiebung im ganzen Raum der Matrize (3) herbeiführt, deren einer Teil des Bodens vorspringt,
    - man dann während des zweiten Abschnittes die endgültige Formung des Stückes vornimmt, indem man den Teil des Preßbodens (3) in bündiger Abschließstellung mit dem festen Teil des Preßbodens (3) gleichzeitig mit dem Absenken des elastischen Puffers (12) verschiebt.
  2. Vorrichtung zum Tiefziehen von Blattmaterialien, insbesondere von Blechscheiben, die einen Puffer (12) aus elastisch deformierbarem und nicht zusammendrückbarem Material und einen Träger für die zu formende Blechscheibe zum Ziehen aufweist, dessen Umfangsteil einen unteren Blechträger (2) und dessen Mittelteil einen Preßboden (3) bildet, der eine Aufnahme besitzt und Mittel zur endgültigen Formung der Blechscheibe zum Ziehen, die von einem Tauchkolben (22) gebildet sind, der auf einen Stempel (11) einwirkt, dadurch gekennzeichnet, daß die Vorrichtung einen äußeren Pressenstempel (21) aufweist, der einen oberen Blechhalter (9) trägt, und dadurch, daß der Preßboden (3) einen festen Teil und einen beweglichen Teil aufweist, der vertikal mit einem Regelungsorgan (6) der Verschiebung des beweglichen Teils zusammenarbeitet, um die Vorformung der Blechscheibe zum Ziehen (20) mit dem vorspringenden beweglichen Teil bezüglich des festen Teils des Preßbodens (3) durchzuführen, und die endgültige Formung des Stückes mit dem beweglichen Teil in bündiger Abschließstellung mit dem festen Teil des Preßbodens (3).
  3. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, daß der bewegliche Teil von einem Kern (5) gebildet ist, der in einer Verteifung (4) angeordnet ist, die in dem festen Teil der Matrize (3) vorgesehen ist, wobei die obere Seite des Kerns die Aufnahme der Matrize (3) vervollständigt.
  4. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, daß der feste Teil von einem Kern (32) gebildet ist, der in einer Vertiefung (4) angeordnet ist, die in dem beweglichen Teil der Matrize (3) vorgesehen ist, wobei die obere Seite des Kerns die Aufnahme der Matrize (3) vervollständigt.
  5. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, daß sie Mittel (16, 33) zur Einstellung der Pressung des oberen Blechhalters (9) im Umfangsbereich der Blechscheibe zum Ziehen (20) aufweist.
  6. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, daß sie Mittel (40) zur Aufnahme des überschüssigen Ausmaßes des elastischen Puffers (12) bezüglich des Ausmaßes, das von der Fläche des zu erhaltenden fertigen Stückes bestimmt ist, aufweist.
  7. Vorrichtung gemäß Anspruch 6, dadurch gekennzeichnet, daß die Mittel (40) zur Aufnahme des überschüssigen Ausmaßes des elastischen Puffers (12) in dem Stempel (11) angeordnet sind.
  8. Vorrichtung gemäß Anspruch 6, dadurch gekennzeichnet, daß die Mittel (40) zur Aufnahme des überschüssigen Ausmaßes des elastischen Puffers (12) in Nachbarschaft zu dem elastischen Puffer (12) angeordnet sind.
EP89403589A 1988-12-30 1989-12-20 Verfahren und Vorrichtung zum Tiefziehen von Blattmaterialien mit einem deformierbaren Stempel unter einem Tauchkolben Expired - Lifetime EP0376808B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89403589T ATE97352T1 (de) 1988-12-30 1989-12-20 Verfahren und vorrichtung zum tiefziehen von blattmaterialien mit einem deformierbaren stempel unter einem tauchkolben.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8817524A FR2641216B1 (fr) 1988-12-30 1988-12-30 Procede et dispositif d'emboutissage de materiaux en feuille avec poincon deformable sous plongeur
FR8817524 1988-12-30

Publications (2)

Publication Number Publication Date
EP0376808A1 EP0376808A1 (de) 1990-07-04
EP0376808B1 true EP0376808B1 (de) 1993-11-18

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EP89403589A Expired - Lifetime EP0376808B1 (de) 1988-12-30 1989-12-20 Verfahren und Vorrichtung zum Tiefziehen von Blattmaterialien mit einem deformierbaren Stempel unter einem Tauchkolben

Country Status (18)

Country Link
US (1) US5016458A (de)
EP (1) EP0376808B1 (de)
JP (1) JP2735334B2 (de)
CN (1) CN1025297C (de)
AR (1) AR243418A1 (de)
AT (1) ATE97352T1 (de)
AU (1) AU624460B2 (de)
BR (1) BR8906856A (de)
CA (1) CA2006773C (de)
CZ (1) CZ283165B6 (de)
DD (1) DD296012A5 (de)
DE (1) DE68910794T2 (de)
ES (1) ES2047698T3 (de)
FR (1) FR2641216B1 (de)
HU (1) HU205287B (de)
RO (1) RO107566B1 (de)
RU (1) RU1829978C (de)
ZA (1) ZA899724B (de)

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JP2016198791A (ja) * 2015-04-09 2016-12-01 株式会社デンソー プレス加工方法、プレス加工装置、プレス成形体、プレス加工品
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CN112008374B (zh) * 2020-07-21 2021-06-22 重庆工程职业技术学院 一种装法兰模块及其消防风筒生产流水线
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Publication number Publication date
CZ283165B6 (cs) 1998-01-14
CS751589A3 (en) 1992-01-15
CN1043646A (zh) 1990-07-11
ATE97352T1 (de) 1993-12-15
FR2641216B1 (fr) 1994-04-01
FR2641216A1 (fr) 1990-07-06
EP0376808A1 (de) 1990-07-04
ZA899724B (en) 1991-08-28
CA2006773A1 (en) 1990-06-30
BR8906856A (pt) 1990-08-21
CA2006773C (en) 1999-09-14
US5016458A (en) 1991-05-21
AU624460B2 (en) 1992-06-11
HU205287B (en) 1992-04-28
DD296012A5 (de) 1991-11-21
RO107566B1 (ro) 1993-12-30
HU896793D0 (en) 1990-03-28
RU1829978C (ru) 1993-07-23
CN1025297C (zh) 1994-07-06
JP2735334B2 (ja) 1998-04-02
ES2047698T3 (es) 1994-03-01
JPH02284724A (ja) 1990-11-22
AR243418A1 (es) 1993-08-31
DE68910794T2 (de) 1994-03-31
AU4700789A (en) 1990-07-05
HUT54541A (en) 1991-03-28
DE68910794D1 (de) 1993-12-23

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