EP0491602A1 - Vorrichtung zum Formstanzen von Blattmaterialen, insbesondere von Blechplättchen - Google Patents

Vorrichtung zum Formstanzen von Blattmaterialen, insbesondere von Blechplättchen Download PDF

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Publication number
EP0491602A1
EP0491602A1 EP91403373A EP91403373A EP0491602A1 EP 0491602 A1 EP0491602 A1 EP 0491602A1 EP 91403373 A EP91403373 A EP 91403373A EP 91403373 A EP91403373 A EP 91403373A EP 0491602 A1 EP0491602 A1 EP 0491602A1
Authority
EP
European Patent Office
Prior art keywords
cushion
blank holder
elastic
sheet
lower blank
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
EP91403373A
Other languages
English (en)
French (fr)
Other versions
EP0491602B1 (de
Inventor
Michel Dittlo
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.)
Isoform SNC
Original Assignee
Isoform SNC
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 Isoform SNC filed Critical Isoform SNC
Publication of EP0491602A1 publication Critical patent/EP0491602A1/de
Application granted granted Critical
Publication of EP0491602B1 publication Critical patent/EP0491602B1/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
    • 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 device for stamping sheet materials, in particular blanks of thin or extra-thin sheet metal.
  • This conventional device does not allow stamping of thin or extra-thin sheets, because the rigidity of the matrix as well as the tightening of the sheet by the blank holder generate non-homogeneous deformations resulting in some areas by lengthening likely cause excessive thinning and in other areas by shrinking tends to cause thickening of the sheet blank, which lead to the formation of folds.
  • the sheet metal to be formed is placed on the cushion of elastic material, a blank clamp is applied to the peripheral part of the sheet blank using an external slider so as to compress the periphery of the cushion and deforming the central part of said sheet blank giving it, at the end of the preforming step, a surface substantially equal to the surface of the finished part to be obtained, then applied using a central slide acting by a punch on the central part of the sheet blank to conform the part to its final shape.
  • This process allows the stamping of a sheet material, in particular of a material with low elongation, which can in particular be a metal sheet, for example of steel.
  • the cushion of elastic material is described as consisting of a substantially parallelepiped mass based on a silicone elastomer of low Shore hardness.
  • the sheet is not sufficiently maintained in the area under the blank holder, that is to say between the blank holder and the cushion of elastic material which does not does not in itself have sufficient rigidity.
  • a device for stamping sheet materials in particular sheet metal blanks comprising a cushion of elastic material housed in a retention tank, means for preforming the blank sheet metal formed by an external slide carrying an upper blank holder, and means for definitive forming of said sheet blank formed by a central slide acting on a punch.
  • This device also includes a lower blank holder formed by a support and holding member for at least part of the sheet blank, placed directly on the cushion and cooperating with the upper blank holder to tighten at least in localized areas. the sheet metal blank.
  • the lower blank holder enters the retention tank and compresses the cushion of elastic material by reaction.
  • the cushion under the effect of this peripheral compression action acts on the central area of the sheet blank and causes the forming of said blank.
  • the angular zones formed in particular by the angles of the lower blank holder cause each sliding of said blank holder to pinch and laminate the elastic material of the cushion with the walls of the retention tank so well that after a certain number of shaping of sheet blanks, the cushion degrades which is detrimental for the production of parts in large series.
  • the device comprises a member for regulating the movement of the bottom of the retention tank to absorb the excess volume of the cushion relative to that determined by the surface of the finished part to be obtained, as described in FR-A-2 641 217.
  • the suction effect is all the more important the greater the ratio of the surface of the cushion to the surface of the part.
  • the cushion When the volume of deformation of the sheet blank is large, the cushion is subjected to large deformations and high pressures so that the deformation radii of the sheet blank are limited and too large for certain applications.
  • the present invention aims to remedy these drawbacks and to improve the efficiency and longevity of the cushion of elastic material for obtaining deep-drawn parts in large series such as automobile parts, the central parts of which are practically never forms of revolution, but have complex shapes which cannot be developed and of variable dimensions for the same tool frame comprising in particular a fixed volume tray.
  • the subject of the invention is a device for stamping sheet materials, in particular sheet blanks comprising a cushion of elastic material housed in an enclosure, means for forming the sheet blank consisting of a matrix, the peripheral part of which forms a greenhouse. - upper blank, and a lower blank holder forming a support and holding member for at least part of the sheet blank, placed directly on the cushion of elastic material and cooperating with the upper blank holder to tighten at least localized areas said sheet blank, characterized in that the lower blank holder is supported on a sliding element disposed around the lateral faces of the cushion of elastic material.
  • the stamping device shown in Figs. 1 and 2 comprises an enclosure 1 which constitutes a housing for a cushion 2 made of an elastic material.
  • the enclosure 1 rests on a press table 9 while the cushion 2 rests on a support plate 3.
  • This means can be constituted for example by springs 4 or by a jack.
  • the underside of the cushion 2 in contact with the support plate 3 is provided with an incompressible elastic sole 5 of Shore hardness greater than the Shore hardness of said cushion.
  • This elastic sole can have the shape of a ring.
  • the upper face and the lateral faces of the cushion 2 are coated with a skin 6 made of an elastic material which may possibly be anti-friction.
  • a lower peripheral blank holder 7 constituted by a frame, for example with a closed contour and which substantially matches the shape of the internal housing of the enclosure 1 so as to be able to penetrate said housing at the time the forming of the part.
  • the lower blank holder 7 is also supported on a sliding element, for example vertically formed by a peripheral jacket 8 disposed between the side faces of the cushion 2 and the side walls 1b of the enclosure 1.
  • the lower blank holder 7 and the jacket 8 are interconnected by suitable means, not shown, and the assembly constituted by this lower blank holder 7 and this jacket 8 as well as by the cushion 2 and the support plate 3 slides. inside the internal housing of enclosure 1.
  • the lower blank holder 7 and the jacket 8 are subjected to a restoring force by at least one elastic member 13 constituted for example by springs interposed between said jacket 8 and the bottom 1a of the enclosure 1.
  • the stamping device comprises a matrix 10 on which a slide 12 of a press acts.
  • the lower part 11 of the matrix 10 constitutes an upper peripheral blank holder.
  • the underside of the matrix 10 has an imprint 10a (Fig. 2) corresponding to the profile of the finished part to be obtained.
  • the lower blank holder 7 and the upper blank holder 11 have external dimensions smaller than the outline of the housing of the enclosure 1 so as to provide at least one space 17 for the passage of air between a sheet blank 20 placed on said lower blank holder, the cushion 2 and the outside by means of at least one small duct 18 formed in the lower blank holder 7.
  • the sheet blank 20 is formed in the following manner.
  • the sheet blank 20 is placed on the lower blank holder 7, then the die 10 and the slider 12 descend progressively.
  • the upper blank holder 11 comes into contact with the sheet blank 20 whose peripheral part is progressively clamped between said upper blank holder 11 and the lower blank holder 7.
  • the progressive descent of the slide 12 and the matrix 10 drives the assembly: upper blank holder 11, lower blank holder 7 and the peripheral jacket 8 and simultaneously causes compression by reaction of the cushion 2.
  • the cushion 2 under the effect of this peripheral compression action acts by creep on the central area of the sheet blank 20 and causes the forming of said blank.
  • the springs 4 regulate the movement of the support plate 3 and therefore regulate the pressure generated in the cushion 2 during the forming of the part.
  • the sole 5 also prevents the cushion 2 from rolling in its lower part.
  • the springs 13 regulate the movement of the lower blank holder 7 and of the jacket 8, caused by the slide 12.
  • the step of releasing the finished part is carried out by the simultaneous ascent of the slide 12 and of the matrix 10.
  • the conduits 18 are connected to pressurized air inlets to reduce the suction effect and allow a rate of at least twenty strokes per minute, ensuring an air flow of at least twice the room volume every second.
  • the air supply is cut off when the cushion 2 returns to its equilibrium position.
  • This air inlet is preferably located at the shallower depth of the stamped part.
  • the vertically sliding element disposed around the lateral faces of the cushion 2 is constituted directly by the lateral walls 30 of the enclosure 1 on which the lower blank holder 7 is supported.
  • the side walls 30 cooperate with a member 31 for regulating the movement of these walls 30 and of the lower blank holder 7.
  • This regulating member 31 is formed for example by a spring system or a jack.
  • the cushion 2 rests, by means of the sole 5, on a support plate 32 which is itself supported on a base 33 also serving as support for the member 31 for regulating the movement of the walls 30 and the blank holder lower 7.
  • This lower blank holder 7 also comprises air inlet ducts 18 between the sheet blank 20 and the cushion 2 and is secured to the walls 30 by suitable means, not shown.
  • the support plate 32 also serves as a guide for the walls 30 when they slide.
  • the side walls and the lower blank holder form a single piece 40 comprising a lower peripheral ring 40a bearing on the member 31 for regulating the displacement and an upper plate 40b forming the lower blank holder and ensuring the support of the blank sheet metal 20.
  • the upper plate 40b also includes air inlet ducts 18 between the sheet metal blank 20 and the cushion 2.
  • the cushion 2 has on its upper face and between the lower blank holder an elastic element 50 for forming the sheet blank 20 and whose Shore hardness is greater than the Shore hardness of said cushion 2.
  • the elastic forming element 50 may consist of at least two layers of different thickness and hardness.
  • the elastic forming element 50 can also be interchangeable.
  • the elastic forming element 50 comprises means of connection with the cushion 2 in a localized area of the upper face of said cushion.
  • These connecting means are constituted by at least one rivet 51 comprising two flat heads of small thickness and large area or by at least one nail comprising a flat head.
  • the elastic forming element 50 can also be glued to the upper side of cushion 2.
  • the elastic element 50 makes it possible to avoid subjecting said cushion to large deformations and to high pressures and to obtaining a marking of the details, in particular of small radii.
  • this elastic element 50 can have any shape such as for example that of the blank or the finished part to be obtained.
  • the elastic forming element 50 undergoes a very low elongation and a sliding is essential between this element and the skin 6 of the cushion 2.
  • the elastic forming element 50 can be located in at least one angular zone of the cushion 2 and can be made up of different pieces of different hardness.
  • This elastic forming element 50 may comprise, on its face in contact with the cushion 2, a rounding lip of said cushion.
  • the side walls 30 may be covered with an anti-friction material 14 obtained by spraying a suitable product on said walls or consisting of at least one plastic sheet or a rubber sheet, and this in all the embodiments .
  • an interchangeable work mat 15 can be interposed between the skin 6 of the upper face of the cushion 2 and the lower blank holder 7 (Fig. 6) or the upper plate 40b of the piece 40 as in the illustrated variants in Figs. 4 and 5.
  • This work mat 15 made of an elastic material has a Shore hardness substantially equal to the Shore hardness of the skin 6 of the cushion 2 and can be fixed to the lower blank holder 7 or to the upper plate 40b of the single piece 40.
  • the device comprises an elastic element 50 for forming the sheet blank 20 as shown in FIG. 6, this element 50 is linked to the mat 15 in a localized area by an appropriate means such as for example a rivet 51 or a nail.
  • the work mat 15 can be formed from at least two superimposed layers, possibly locally bonded.
  • At least one of the layers of this work mat can be made of an elastic textile and / or have substantially parallel slots.
  • the anti-friction material 14 placed on the walls 1b or 30 of the enclosure 1 or the walls of the part 40, as well as the work mat 15 can replace the skin 6 of the cushion 2.
  • modular wall elements 60 are interposed between the side walls 1b of the enclosure 1 and the peripheral jacket 8 so as to reduce the suction phenomenon.
  • the modulation of the volume of the enclosure 1 and therefore of the dimensions of the cushion 2 ensures a ratio of the surface of said cushion to the surface of the room next to two, and a control of the suction effect, and this for all dimensions pieces.
  • the modular and interchangeable wall elements 60 are made of an almost incompressible material, such as for example machinable boards for building models.
  • the number of wall elements used allows great freedom of dimension of the enclosure 1 and of the cushion 2 for a single tool and frame.
  • the lower blank holder 7 or the upper plate 40b of the piece 40 can be made of two sheets of machined sheets providing between them an air inlet.
  • One of the plates may be made of an incompressible elastic material.
  • the plate of the lower blank holder 7 or 40b, in contact with the sheet blank 30 may have grooves on its vertical inner face to improve the passage of air towards the upper part of the part to be formed.
  • This lower clamp plate 7 or 40b, in contact with the sheet blank 20 may be made up of an assembly of boards.
  • the lower blank holder may have a shape corresponding to the shape of the peripheral zone of the finished part to be obtained.
  • the lower blank holder 7 or the upper plate 40b of the single piece 40 makes it possible, with the upper blank holder 11, to tighten the sheet blank 20 at least in localized areas.
  • the support plate 32 may include an internal recess to contain the cushion 2 or be made in one piece with the base 33.
  • a means of regulating the pressure generated in the cushion 2 during the forming of the part can be interposed between the part support 32 and base 33.
  • the device according to the invention has the advantage of significantly reducing any pinching and rolling phenomenon of the cushion and of improving the efficiency and the longevity of this cushion for large series stampings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Supports Or Holders For Household Use (AREA)
EP91403373A 1990-12-18 1991-12-12 Vorrichtung zum Formstanzen von Blattmaterialen, insbesondere von Blechplättchen Expired - Lifetime EP0491602B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9015866A FR2670408A1 (fr) 1990-12-18 1990-12-18 Dispositif d'emboutissage de materiaux en feuille notamment de flans de tole.
FR9015866 1990-12-18

Publications (2)

Publication Number Publication Date
EP0491602A1 true EP0491602A1 (de) 1992-06-24
EP0491602B1 EP0491602B1 (de) 1995-05-03

Family

ID=9403369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91403373A Expired - Lifetime EP0491602B1 (de) 1990-12-18 1991-12-12 Vorrichtung zum Formstanzen von Blattmaterialen, insbesondere von Blechplättchen

Country Status (8)

Country Link
US (1) US5255550A (de)
EP (1) EP0491602B1 (de)
JP (1) JPH04305321A (de)
AT (1) ATE121975T1 (de)
DE (1) DE69109457T2 (de)
ES (1) ES2071954T3 (de)
FR (1) FR2670408A1 (de)
RU (1) RU2025169C1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3018709A1 (fr) * 2014-03-20 2015-09-25 Peugeot Citroen Automobiles Sa Outillage d'emboutissage pour la conformation d'une piece emboutie
CN105414354A (zh) * 2015-12-24 2016-03-23 天津滨海高新区望越科技发展有限公司 一种汽车冲压模工件支撑缓冲装置

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6233989B1 (en) 2000-10-13 2001-05-22 Changing Paradigms, Llc Method and apparatus for stamping a metal sheet with an apertured design having rolled edges
JP5194582B2 (ja) * 2007-06-20 2013-05-08 大日本印刷株式会社 圧胴及びこれを用いたエンボス加工装置
KR101197089B1 (ko) 2011-04-19 2012-11-07 한국과학기술원 비대칭 축류형 제품의 단조장치
CN104249114B (zh) * 2014-09-29 2016-06-29 江阴德玛斯特钻具有限公司 内翻边型钻杆保护套内翻边生产流水线
CN105537405A (zh) * 2016-01-20 2016-05-04 常州协发机械制造有限公司 一种封头内翻边用翻边模具
CN105665511B (zh) * 2016-04-22 2017-07-28 山东多星电器有限公司 一种锅体拉伸机
US10773291B2 (en) * 2017-05-24 2020-09-15 Polyurethane Products Universal radius forming system
US12097549B2 (en) * 2022-09-15 2024-09-24 The Boeing Company Stamp-forming system and method
PL248216B1 (pl) * 2023-12-01 2025-11-03 Politechnika Rzeszowska Im Ignacego Lukasiewicza Elastomerowa matryca tłocznika
PL248214B1 (pl) * 2023-12-01 2025-11-03 Politechnika Rzeszowska Im Ignacego Lukasiewicza Tłocznik
PL248215B1 (pl) * 2023-12-01 2025-11-03 Politechnika Rzeszowska Im Ignacego Lukasiewicza Elastomerowy stempel tłocznika
PL248217B1 (pl) * 2023-12-01 2025-11-03 Politechnika Rzeszowska Im Ignacego Lukasiewicza Elastomerowa wkładka matrycy tłocznika

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB184405A (en) * 1921-11-01 1922-08-17 Hydro Press Company Proprietar Improvements relating to the shaping of sheet metal by fluid pressure
US2342858A (en) * 1941-03-17 1944-02-29 Hudson Motor Car Co Stamping apparatus
US2735390A (en) * 1956-02-21 Harris
US2761405A (en) * 1953-12-14 1956-09-04 Svenska Aeroplan Ab Hydraulic forming attachment for presses
US2796253A (en) * 1948-06-03 1957-06-18 Glenn L Martin Co Cushion control system for a press
US2840025A (en) * 1953-08-04 1958-06-24 Baldwin Lima Hamilton Corp Mounting for resilient press pads of polygonal cross-section
US3382690A (en) * 1965-09-17 1968-05-14 Kaufmann Tool & Engineering Co Draw die
FR2564339A1 (fr) * 1984-05-17 1985-11-22 Usinor Procede et dispositif d'emboutissage de toles.
FR2584956A1 (fr) * 1985-07-22 1987-01-23 Courbis Technologies Bloc matrice notamment pour le travail des metaux en feuille
EP0292357A1 (de) * 1987-05-22 1988-11-23 Isoform Verfahren zum Schneiden dünner Platten, insbesondere von Blech und elastomerisches Material, das für dieses Verfahren verwendet wird
GB2208619A (en) * 1987-08-15 1989-04-12 Austin Rover Group A sheet metal forming tool and methods of making and using same
EP0376808A1 (de) * 1988-12-30 1990-07-04 Isoform Verfahren und Vorrichtung zum Tiefziehen von Blattmaterialien mit einem deformierbaren Stempel unter einem Tauchkolben
FR2641215A1 (fr) * 1988-12-30 1990-07-06 Isoform Dispositif d'emboutissage de materiaux en feuilles

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2590814B1 (fr) * 1985-12-04 1988-02-26 Usinor Procede et dispositif d'emboutissage de toles a faible allongement
FR2641217B1 (fr) * 1988-12-30 1994-04-01 Isoform Procede et dispositif d'emboutissage de materiaux en feuille sur une matrice de formage elastique

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735390A (en) * 1956-02-21 Harris
GB184405A (en) * 1921-11-01 1922-08-17 Hydro Press Company Proprietar Improvements relating to the shaping of sheet metal by fluid pressure
US2342858A (en) * 1941-03-17 1944-02-29 Hudson Motor Car Co Stamping apparatus
US2796253A (en) * 1948-06-03 1957-06-18 Glenn L Martin Co Cushion control system for a press
US2840025A (en) * 1953-08-04 1958-06-24 Baldwin Lima Hamilton Corp Mounting for resilient press pads of polygonal cross-section
US2761405A (en) * 1953-12-14 1956-09-04 Svenska Aeroplan Ab Hydraulic forming attachment for presses
US3382690A (en) * 1965-09-17 1968-05-14 Kaufmann Tool & Engineering Co Draw die
FR2564339A1 (fr) * 1984-05-17 1985-11-22 Usinor Procede et dispositif d'emboutissage de toles.
FR2584956A1 (fr) * 1985-07-22 1987-01-23 Courbis Technologies Bloc matrice notamment pour le travail des metaux en feuille
EP0292357A1 (de) * 1987-05-22 1988-11-23 Isoform Verfahren zum Schneiden dünner Platten, insbesondere von Blech und elastomerisches Material, das für dieses Verfahren verwendet wird
GB2208619A (en) * 1987-08-15 1989-04-12 Austin Rover Group A sheet metal forming tool and methods of making and using same
EP0376808A1 (de) * 1988-12-30 1990-07-04 Isoform Verfahren und Vorrichtung zum Tiefziehen von Blattmaterialien mit einem deformierbaren Stempel unter einem Tauchkolben
FR2641215A1 (fr) * 1988-12-30 1990-07-06 Isoform Dispositif d'emboutissage de materiaux en feuilles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3018709A1 (fr) * 2014-03-20 2015-09-25 Peugeot Citroen Automobiles Sa Outillage d'emboutissage pour la conformation d'une piece emboutie
CN105414354A (zh) * 2015-12-24 2016-03-23 天津滨海高新区望越科技发展有限公司 一种汽车冲压模工件支撑缓冲装置

Also Published As

Publication number Publication date
DE69109457D1 (de) 1995-06-08
FR2670408B1 (de) 1995-03-17
EP0491602B1 (de) 1995-05-03
US5255550A (en) 1993-10-26
FR2670408A1 (fr) 1992-06-19
RU2025169C1 (ru) 1994-12-30
JPH04305321A (ja) 1992-10-28
ES2071954T3 (es) 1995-07-01
ATE121975T1 (de) 1995-05-15
DE69109457T2 (de) 1996-01-04

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