EP0231677B1 - Procédé et dispositif d'emboutissage de matériaux en feuille, à faible allongement - Google Patents

Procédé et dispositif d'emboutissage de matériaux en feuille, à faible allongement Download PDF

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Publication number
EP0231677B1
EP0231677B1 EP86402621A EP86402621A EP0231677B1 EP 0231677 B1 EP0231677 B1 EP 0231677B1 EP 86402621 A EP86402621 A EP 86402621A EP 86402621 A EP86402621 A EP 86402621A EP 0231677 B1 EP0231677 B1 EP 0231677B1
Authority
EP
European Patent Office
Prior art keywords
sheet
cushion
slide
central
blank holder
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
Application number
EP86402621A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0231677A1 (fr
Inventor
Gabriel De Smet
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.)
Sollac SA
Original Assignee
USINOR Aciers
Sollac SA
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 USINOR Aciers, Sollac SA filed Critical USINOR Aciers
Priority to AT86402621T priority Critical patent/ATE42698T1/de
Publication of EP0231677A1 publication Critical patent/EP0231677A1/fr
Application granted granted Critical
Publication of EP0231677B1 publication Critical patent/EP0231677B1/fr
Expired 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
    • 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 present invention relates to a process and a device for stamping sheet materials with low elongation and more particularly, but not limited to steels with high elastic limit, called HLE.
  • the stamping of large parts is usually done by drawing with double effect presses, mechanical or hydraulic.
  • These devices essentially comprise a fixed matrix and two independent slides, a central slide, called a plunger carrying a punch, and an external slide reserved for hold-down operations, that is to say sufficient support allowing by reaction the stretching under the punch.
  • the movements are generally as follows: (1) rapid descent of the blank holder which maintains constant pressure on the sheet and thus prevents it from moving; (2) rapid descent of the punch until it comes into contact with the sheet, then (3) slow descent of the punch during the stamping phase, under actual drawing; and (4) rapid ascent of the central slide causing the blank holder to rise.
  • This high pressure promotes seizure, and causes rapid wear of the blank holder and the matrix entry spokes.
  • the second difficulty encountered in the drawing of HLE steels comes from the folding of the sheet in the central part of the stamping during the attack of the punch.
  • At least one active part is provided on the first external slide, the shape of which corresponds to the surface area excess with respect to the volume to be formed, this active part acting on the peripheral part of the sheet itself in contact, by its other side, with the elastic cushion.
  • This technique consists in deforming in successive stages the sheet blank starting from its periphery, that is to say falling an edge. It allows very large deformations insofar as, at each step, the parameters for reducing the surface under the blank holder act so as to keep the thickness of the sheet substantially constant.
  • this technique would not allow complex shapes to be obtained in the central part of the stamping.
  • it essentially aims at obtaining deep-drawn stamps of simple shape through the use of successive peripheral deformations produced by the falling of the edges.
  • the present invention aims to obtain deep-drawn parts of medium depth, but large areas such as automobile parts, the central parts of which are practically never forms of revolution but represent complex shapes which cannot be developed.
  • the present invention relates to a process for stamping sheet materials, in particular sheet metal, on a double-acting press of the type comprising a cushion made of an elastic material according to which the sheet metal to be formed is placed on a support, a first slide is applied.
  • a second central slide is applied to the central part of the sheet, characterized in that the peripheral part of the sheet to be formed is placed on a lower blank holder forming a container for the cushion of elastic material and whose upper face for holding the sheet is located at a level higher than that of the working face of the elastic cushion, the first external slide is applied, the body of which has a section smaller than that of the lower blank holder and which has at its periphery an upper blank holder cooperating with the lower blank holder to tighten the sheet, the outer slide is continued to descend against the elastic cushion to drop an edge of the sheet blank and cause the mass of the elastic cushion to creep in order to deform the central part of the sheet so as to give it a surface substantially equal to the surface of the finished part to be obtained, then the central slide is moved to conform the angular volumes and the central part of the sheet by final creep of the support.
  • the essential characteristic of the invention resides in the falling of a peripheral edge which has the object of which is to reduce the volume of metal to be shrunk and consequently leads to a reduction in the pressure corresponding to the punch, that is to say in the case of elastoforming on an elastic cushion according to the present invention, to a reduction in the pressure in this cushion.
  • the surface of the central slide in contact with the sheet plays the role of the bottom of the matrix and the elastic cushion of flowable material that of a punch applying the sheet in the bottom of the matrix to form the angular volumes.
  • an external slide is then used whose working face in contact with the sheet, forming a peripheral matrix, includes active parts as described in the patent FR 8,407,678 in combination with the edge falling operation according to the present invention. It should be noted that these active parts form a relief that is both convex and concave according to the most advantageous technical arrangement for the part considered.
  • These active parts can also be placed in the bottom of the matrix carried by the central slide when they correspond to areas of the finished part which are intended to be eliminated by subsequent cutting.
  • the subject of the invention is also a stamping device of the type comprising a support on which the sheet metal to be formed is placed, a first external slide, a second central slide and a cushion made of an elastic material, characterized in that the support is constituted by a lower peripheral blank holder forming a container for the cushion of elastic material, and the sheet holding surface of which is situated at a level higher than that of the elastic cushion, the external slide having a body of section smaller than that of the lower blank holder to penetrate the latter by making a falling edge of the sheet blank and reach the cushion of elastic material and cause its creep, the outer part of the outer slider carrying an upper peripheral blank holder cooperating with the blank holder lower to tighten the sheet, and the central slide carrying a bottom of matrix.
  • the external slide comprises on its lower face forming a peripheral matrix at least one active part in convex or concave relief, the shape of which corresponds to the excess surface of the sheet, of substantially constant thickness, with respect to the volume to be formed.
  • the central slide carries a matrix bottom comprising at least one active part in concave or convex relief corresponding to the excess surface of the sheet, with thickness substantially constant with respect to the volume to be formed.
  • the elastic support material is preferably easily flowable, for example an elastomer having a Shore 00 hardness of less than 30.
  • the device of FIG. 1 in position before forming comprises the usual constituent elements of a double-acting press, and therefore only the part relating to the invention is shown.
  • An external slide 1 carries at its external part an upper peripheral blank holder 2 which cooperates with a lower peripheral blank holder 3 forming a support on which there is a sheet to be stamped.
  • the lower peripheral blank holder 3 forms a container in which is housed an elastic cushion 5 occupying the entire surface of this container.
  • the sheet holding surface 6 is located at a level higher than the upper working face 7 of the elastic cushion.
  • the outer slider 1 comprises a body 8 whose outer section is less than the inner section of the lower blank holder 3, so that the underside 9 of the outer slider opposite the sheet 4, can, in the absence of this last, enter the lower blank holder 3 to reach the cushion 5 of elastic material and cause its creep.
  • the central slide 10 carries a bottom of the matrix 11, the peripheral part of the matrix being constituted by the lower face 9 of the external slide 1.
  • the outer slider 1 and the central slider 10 are actuated in synchronism as will be seen below and play, by their lower faces 9 and 11, the role of matrix, the cushion 5 of elastic material playing the role of punch during operation.
  • the cushion 5 made of elastic material consists of an elastomer having a Shore 00 hardness less than 30, a very important characteristic residing in the rapid return time of the material (preferably less than 1 second) to its initial shape.
  • the bottom of the matrix (11) carried by the central slide is made of a material easy to machine or to shape such as a plastic material, in particular a polyurethane, polyepoxy, a polyester, a concrete, a concrete with resin added, a composite material, these materials possibly being loaded with fibers, in particular glass; or hardwood such as boxwood.
  • a plastic material in particular a polyurethane, polyepoxy, a polyester, a concrete, a concrete with resin added, a composite material, these materials possibly being loaded with fibers, in particular glass; or hardwood such as boxwood.
  • Retractable members 12 inflatable candles or bladders protrude into the elastic cushion 5, and their inserted volume represents approximately the expansion volume of the elastomer after forming.
  • the cushion 5 comprises conduits 13 allowing the circulation of a cooling fluid such as compressed air.
  • Other conduits 14, in particular when compressed air is used, can be used to take off from the finished part.
  • FIG. 2 represents the step of falling off the edge 20 of the part which is housed in the annular space 21 formed outside the body 8 of the external slide 1 as indicated in FIG. 1
  • the outer slide 1 is lowered, carrying the peripheral matrix 9.
  • the latter comes into contact with the sheet blank 4 whose peripheral part is progressively clamped between the upper 2 and lower 3 blank clamps to avoid its scalloping.
  • peripheral matrix 9 forms a fallen edge 20 of the sheet blank and simultaneously compresses by reaction the elastomer cushion 5.
  • the latter under the effect of this peripheral compression action acts by creep on the central area of the blank of sheet metal and causes its deformation.
  • the swelling of the central part of the sheet blank is limited by the die bottom 11 fixed to the central slide 10 in order to avoid uncontrolled erratic deformations due to the anisotropy of the metal or of the shapes of asymmetrical parts.
  • the descent of the outer slide 1 carrying the peripheral matrix 9 is limited in such a way that the deformation in the central part of the sheet blank gives a surface substantially equal to that of the finished part to be obtained.
  • FIG. 3 represents the stage of final shaping of the part.
  • the central slide 10 carrying the bottom of the matrix 11 descends to its low position and causes the final forming of the central part of the sheet 4, preformed during the previous operation.
  • FIG. 4 represents the step of decompression of the elastomer cushion 5, by withdrawal of the candles 12. The aim of this operation is to avoid deformation of the stamped part by expansion reaction of the elastomer.
  • FIG. 5 represents the step of releasing the formed part 21, by simultaneous ascent of the opdeux slides 1 and 10 carrying the dies.
  • compressed air is circulated in the conduits 13.
  • the cooling of the elastomer 5 can also be carried out during the previous step of decompression (Fig. 4).
  • compressed air is sent through the conduits 14 to allow the part 21 to take off.
  • the outer slide 1 carries a peripheral matrix 9 which has in its angles an appropriate shape in convex relief, that is to say forming a projection 22 formed integrally with the peripheral matrix 9 (this relief shape 22 corresponds to the surface area in excess of the volume to be formed of the part that is to be produced) its active surface is carefully polished so as to allow the displacement of the excess material during forming; this active surface can also be treated to facilitate the sliding of the sheet.
  • the external slide 1 carries a peripheral matrix 9 in which are concave active parts, that is to say hollow 23, which play the same role as the parts 22 of FIG. 6, the arrangement of which is chosen for reasons of optimization of the stamped part.
  • the active parts 23 may possibly be arranged in areas of the stamped, which will be eliminated by cutting in the finished part. It is also possible to place active parts 24 having the functional role defined below in the bottom of the matrix 11 carried by the central slide 10 when these active parts 24 are located in central zones of the stamping which will be eliminated by cutting in the finished part or when the latter corresponds to the part of the sheet metal located essentially under the outer slide.
  • This variant is more especially intended for the production of complex shapes with sharp angles of the central part of. the stamped.
  • Stamping by turning as described above with its falling edge makes it possible to reduce the pressure necessary for forming the sheet by reversing the traditional punch cycle.
  • the pressure which was exerted only for the forming of the sheet on the equivalent of the matrix entry radii, is applied after this inversion on the entire central surface of the stamped.
  • the pressure necessary for this pre-forming of the sheet is very low (value comprised at most between 10 and 20 bars (1 and 2 MPa).
  • This low pressure regime thus makes it possible to form large areas and to create a new double-effect tool technique with an elastomer matrix of low Shore hardness which can be adapted to existing body presses.
  • the first phase of the stamping operation consists in making the peripheral edges (Fig. 2) fall from the blank by the external slider 1.
  • the first phase simultaneously sees the realization of the curved preforming surface which causes the expansion of the sheet and thus prevents the formation of folds.
  • the curvature of the surface being mainly obtained by the multidirectional bending of the sheet, which allows during the shaping operation second and last phase of the stamping operation which will modify these bends, a very great potential for rearrangement of shapes .
  • sheet metal must be given a general meaning of a thin plate of sheet material without wanting to limit its scope to metallic products.
  • the process of the present invention can also be used for thermoforming sheet materials.
  • the materials can be previously heated to a temperature which does not degrade the material constituting the elastic cushion.

Landscapes

  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Packaging For Recording Disks (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Laminated Bodies (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Making Paper Articles (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Soil Working Implements (AREA)
  • Adornments (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Food-Manufacturing Devices (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
EP86402621A 1985-12-04 1986-11-25 Procédé et dispositif d'emboutissage de matériaux en feuille, à faible allongement Expired EP0231677B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86402621T ATE42698T1 (de) 1985-12-04 1986-11-25 Verfahren und vorrichtung zum formstanzen von metallplatten mit geringer ausdehnung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8517957A FR2590814B1 (fr) 1985-12-04 1985-12-04 Procede et dispositif d'emboutissage de toles a faible allongement
FR8517957 1985-12-04

Publications (2)

Publication Number Publication Date
EP0231677A1 EP0231677A1 (fr) 1987-08-12
EP0231677B1 true EP0231677B1 (fr) 1989-05-03

Family

ID=9325443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86402621A Expired EP0231677B1 (fr) 1985-12-04 1986-11-25 Procédé et dispositif d'emboutissage de matériaux en feuille, à faible allongement

Country Status (24)

Country Link
US (1) US4770015A (no)
EP (1) EP0231677B1 (no)
JP (1) JPS62134122A (no)
KR (1) KR950003541B1 (no)
CN (1) CN1009623B (no)
AT (1) ATE42698T1 (no)
AU (1) AU587694B2 (no)
BR (1) BR8605934A (no)
CA (1) CA1275867C (no)
CZ (1) CZ279500B6 (no)
DD (1) DD252560A5 (no)
DE (1) DE3663116D1 (no)
DK (1) DK159759C (no)
ES (1) ES2008857B3 (no)
FR (1) FR2590814B1 (no)
GR (1) GR3000065T3 (no)
HU (1) HU210052B (no)
IE (1) IE59211B1 (no)
IL (1) IL80706A0 (no)
MX (1) MX161003A (no)
NO (1) NO166170C (no)
PT (1) PT83850B (no)
SU (1) SU1727521A3 (no)
ZA (1) ZA868833B (no)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19842750B4 (de) * 1998-09-18 2005-06-09 Audi Ag Verfahren und Herstellung von tiefgezogenen Hohlteilen und Ziehwerkzeug

Families Citing this family (17)

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FR2641217B1 (fr) * 1988-12-30 1994-04-01 Isoform Procede et dispositif d'emboutissage de materiaux en feuille sur une matrice de formage elastique
FR2641216B1 (fr) * 1988-12-30 1994-04-01 Isoform Procede et dispositif d'emboutissage de materiaux en feuille avec poincon deformable sous plongeur
FR2641215A1 (fr) * 1988-12-30 1990-07-06 Isoform Dispositif d'emboutissage de materiaux en feuilles
FR2670408A1 (fr) * 1990-12-18 1992-06-19 Isoform Dispositif d'emboutissage de materiaux en feuille notamment de flans de tole.
FR2683168B1 (fr) * 1991-11-04 1994-03-04 Isoform Dispositif d'emboutissage de materiaux en feuille, notamment de flans de tole.
FR2691653B1 (fr) * 1992-05-27 1994-08-26 Isoform Dispositif d'emboutissage de matériaux en feuille sur une matrice de formage en matériau élastique.
FR2715335B1 (fr) * 1994-01-21 1996-04-05 Lorraine Laminage Dispositif d'emboutissage d'un flan de tôle.
DE4434799A1 (de) * 1994-09-29 1996-04-04 Smg Sueddeutsche Maschinenbau Verfahren und Vorrichtung zum Umformen von Metallblech
US5540075A (en) * 1994-10-25 1996-07-30 Owens-Corning Fiberglas Technology, Inc. Method and apparatus for shock release of thin foil materials
DE19939504A1 (de) * 1999-08-20 2001-03-08 Konrad Schnupp Verfahren zur Betätigung einer Umformpresse
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
CN101920285B (zh) * 2010-06-08 2012-05-23 东莞市旗丰消声器有限公司 油箱半壳工件一次拉深成型的工艺方法
RU2527463C1 (ru) * 2013-05-28 2014-08-27 Российская Федерация, от имени которой выступает Министерство промышленности и торговли Российской Федерации (Минпромторг России) Способ формования ударостойких прозрачных полимерных листов
CN105215127B (zh) * 2015-10-12 2017-04-26 天津职业技术师范大学 一种基于非均质金属橡胶的板材软模热成形装置及方法
CN105414348A (zh) * 2015-12-24 2016-03-23 辽宁瑟克赛斯热能科技有限公司 一种板式换热器板片柔性压制成型模具
CN106984684B (zh) 2016-01-20 2021-05-18 福特环球技术公司 材料冲压成型及车辆顶棚成型方法、用于成型材料的组件
CN106001234B (zh) * 2016-06-08 2018-02-23 广东鸿业机械有限公司 液胀成型装置及液胀成型工艺

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GB603683A (en) * 1945-10-27 1948-06-21 Helliwells Ltd An improved method and means of shaping sheet-metal under pressure
US2602411A (en) * 1949-08-02 1952-07-08 Michael S Schnell Means for drawing material
US2749867A (en) * 1952-12-03 1956-06-12 John H Engel Controlled pressure metal forming apparatus
US3380272A (en) * 1965-12-27 1968-04-30 Kaiser Aluminium Chem Corp Apparatus for forming foil containers
US3552165A (en) * 1968-05-22 1971-01-05 John H Taylor Domestic-pan-forming device
DE2131811A1 (de) * 1971-06-23 1972-12-28 Siemens Elektrogeraete Gmbh Vorrichtung zum Tiefziehen rohrfoermiger Werkstuecke
US3914969A (en) * 1973-04-18 1975-10-28 Nasa Apparatus for forming dished ion thruster grids
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SU863075A2 (ru) * 1980-01-21 1981-09-15 Кишиневский завод "Сигнал" Штамп дл выт жки
FR2564339B1 (fr) * 1984-05-17 1987-12-24 Usinor Procede et dispositif d'emboutissage de toles.
GB8421634D0 (en) * 1984-08-25 1984-09-26 Alcan Int Ltd Forming of metal articles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19842750B4 (de) * 1998-09-18 2005-06-09 Audi Ag Verfahren und Herstellung von tiefgezogenen Hohlteilen und Ziehwerkzeug

Also Published As

Publication number Publication date
NO166170B (no) 1991-03-04
PT83850B (pt) 1990-03-08
PT83850A (fr) 1987-01-01
DK159759B (da) 1990-12-03
IE59211B1 (en) 1994-01-26
EP0231677A1 (fr) 1987-08-12
KR870005710A (ko) 1987-07-06
CN86107980A (zh) 1987-07-29
MX161003A (es) 1990-06-29
ATE42698T1 (de) 1989-05-15
IE863174L (en) 1987-06-04
SU1727521A3 (ru) 1992-04-15
FR2590814B1 (fr) 1988-02-26
FR2590814A1 (fr) 1987-06-05
GR3000065T3 (en) 1990-10-31
CA1275867C (en) 1990-11-06
DE3663116D1 (en) 1989-06-08
AU7111787A (en) 1988-10-06
DD252560A5 (de) 1987-12-23
NO864816D0 (no) 1986-12-01
HUT43515A (en) 1987-11-30
HU210052B (en) 1995-01-30
KR950003541B1 (ko) 1995-04-14
ES2008857B3 (es) 1989-08-16
DK582486A (da) 1987-06-05
AU587694B2 (en) 1989-08-24
CZ279500B6 (cs) 1995-05-17
NO864816L (no) 1987-06-05
ZA868833B (en) 1987-07-29
JPH0255126B2 (no) 1990-11-26
CN1009623B (zh) 1990-09-19
US4770015A (en) 1988-09-13
IL80706A0 (en) 1987-02-27
BR8605934A (pt) 1987-09-15
DK159759C (da) 1991-08-05
CZ888686A3 (en) 1993-11-17
JPS62134122A (ja) 1987-06-17
DK582486D0 (da) 1986-12-03
NO166170C (no) 1991-06-12

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