EP0165133B1 - Procédé et dispositif d'emboutissage de tôles - Google Patents

Procédé et dispositif d'emboutissage de tôles Download PDF

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Publication number
EP0165133B1
EP0165133B1 EP85400946A EP85400946A EP0165133B1 EP 0165133 B1 EP0165133 B1 EP 0165133B1 EP 85400946 A EP85400946 A EP 85400946A EP 85400946 A EP85400946 A EP 85400946A EP 0165133 B1 EP0165133 B1 EP 0165133B1
Authority
EP
European Patent Office
Prior art keywords
support
sheet
central
elastomer
slide
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
EP85400946A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0165133A1 (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
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Priority to AT85400946T priority Critical patent/ATE102510T1/de
Publication of EP0165133A1 publication Critical patent/EP0165133A1/fr
Application granted granted Critical
Publication of EP0165133B1 publication Critical patent/EP0165133B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/02—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of a flexible element, e.g. diaphragm, urged by 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/10—Stamping using yieldable or resilient pads

Definitions

  • the subject of the present invention is a method and a device for stamping sheet metal, in particular extra-thin steel sheet of large dimensions usable for example in the automotive industry, or comprising shapes having relatively closed dihedral angles.
  • the lower limit of the thicknesses is nevertheless limited by current stamping techniques, which do not allow the use, in the dimension of the body parts, of steel sheets whose thickness is less than approximately 55/100 mm, because of the tearing which appears in the areas subjected to stretching or of the creasing in the areas subjected to shrinking, of the sheet metal stamping.
  • 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. Movements are generally as follows: (1) rapid descent of the blank holder which maintains a 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 proper stretching: and (4) rapid ascent of the central slide causing the blank holder in its ascent.
  • this process does not prevent the formation of folds, the pressure gradients generated by the deformation of the elastomer decreasing as we approach the upper surface of the elastomer mass, especially for the production of angular shapes, the sheet being insufficiently held at its periphery due to the work on a single-effect press.
  • a drawing process which simultaneously implements a combination of operating modes relating to deep drawing, drawing on an elastomer and drawing under fluid pressure using work of the stamping and drawing phases of the sheet.
  • the elastomeric element is not only made of an elastomeric mass, but also comprises a bladder inflatable by a fluid which resembles it to a hydroforming technique.
  • the object of the invention is therefore to provide a technology for stamping metal sheets having angular volumes and in particular extra-thin steel sheets ( ⁇ 50/100 mm), in large series and under competitive economic conditions. , without folds and with a substantially constant thickness.
  • high elastic limit steel sheets HLE is meant steels for which E> 350 MPa.
  • the invention which relates more particularly to ultra-thin sheets makes it possible to obtain the simultaneity and the coincidence of the forming action of the peripheral part of the sheet in certain zones and the conformation of the central part of the sheet.
  • the part of the central slide plays the role of bottom of matrix and the support in flowable material that of punch applying the sheet in the bottom of matrix to form the angular volumes.
  • the invention is based on the principle of equality of the surfaces of the initial flat sheet metal blank and the shaped blank strictly corresponds to the shape of the stamped part desired, increased by the excess peripheral surfaces shaped under blank holder, thus conditioning the maintaining a substantially constant thickness of the sheet of equal stress which will be explained below.
  • the invention also relates to a drawing device of the type comprising a support made of an elastic material against which the sheet metal to be formed is applied, a first external slide or blank holder and a second central slide characterized in that the support in an elastic material comprises an elastomer having a shore A hardness of less than 30, and the external slide comprises at least one active part intended to come into contact with the peripheral part of the sheet and to cause the part to be preformed by creeping central of the sheet, with a substantially constant thickness of said sheet, the surface of said preformed central part being substantially equal to the surface of the finished part obtained.
  • the elastic support material is preferably easily flowable, for example an elastomer having a shore A hardness of less than 30 and preferably less than 10.
  • 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 or blank holder 1 carries a peripheral part 10 forming a matrix which has in its angles an appropriate relief shape 11 formed integrally with the peripheral matrix 10 (this relief shape 11 corresponds to the surface area in excess with respect to the volume to be form the part that you want to make, for example as illustrated in Fig. 6) and its active surface is carefully polished to allow the movement of excess material during forming; this active surface can also be treated to facilitate the sliding of the material.
  • the central slide 2 carries a bottom of the matrix 2a and is in the raised position, while the sheet blank 7 to be formed is placed in the center of a support 4 disposed in a container 3 (tray).
  • the support 4 of easily flowable elastic material plays the role of punch by deformation.
  • the support 4 is constituted by an elastomer having a shore hardness less than 30 and preferably less than 10, a very important characteristic residing in the rapid return time of the material (preferably less than 1 second) to its initial shape.
  • a natural rubber foam having a shore hardness of about 15 and having a very short deformation time of the order of 1 s.
  • other conventional gels or foams preferably having high plasticity, for example silicone elastomers, or cellular foams, the cells of which can be filled with liquid.
  • a composite support consisting of a substantially parallelepiped mass based on a silicone elastomer having a shore hardness of 10 to 20, covered on its upper face and on all or part of its lateral faces with a relatively thin skin (for example 10 to 15 mm) and of a more resistant and harder material such as a silicone of shore hardness 50 or of teflon having favorable antifriction properties.
  • Retractable members 5 inflatable candles or bladders protrude into the elastomer serving as a support 4, and their inserted volume represents approximately the expansion volume of the elastomer after forming.
  • the support 4 is covered with a plastic sheet 8, for example of "Teflon", interposed between the sheet 7 and the elastomer, which can be optionally glued or welded to the elastomer and which has the main purpose of facilitating the sliding of the sheet during forming, but it can also serve to protect the elastomer as indicated in the preceding composite structure.
  • a plastic sheet 8 for example of "Teflon”
  • the support 4 includes conduits 6 allowing the circulation of a cooling fluid such as compressed air.
  • a cooling fluid such as compressed air.
  • Fig. 2. represents the pre-forming stage of the part.
  • the blank holder slider 1 is lowered carrying the peripheral matrix 10.
  • the latter comes into contact with the sheet blank 7 which compresses by reaction the elastomer support 4.
  • the elastomer under the effect of this action of peripheral compression acts by creep on the central zone of the sheet blank and causes its deformation.
  • the swelling of the central part of the sheet blank is limited by the matrix bottom 2a fixed to the central slide 2 in order to avoid uncontrolled erratic deformations due to the anisotropy of the metal or to forms of asymmetrical parts.
  • the descent of the blank holder slide 1 carrying the peripheral matrix 10 is limited by adjustable mechanical stops 12 so that the deformation in its central part of the sheet blank gives a surface area substantially equal to that of the finished part to be obtained.
  • Fig. 3 represents the final shaping stage of the part.
  • the central slide 2 carrying the bottom of the die 2a descends to its low position and causes the final forming of the central part of the sheet 7, preformed during the previous operation.
  • Fig. 4 represents the step of decompression of the elastomer support 4 by removal of the candles 5. This operation aims to avoid the deformation of the stamped part by expansion reaction of the elastomer.
  • Fig. 5 shows the step of releasing the formed part 7, by simultaneously raising the two sliders 1 and 2 carrying the dies.
  • compressed air is circulated in the conduits 6.
  • the cooling of the support 4 can also be performed during the previous decompression step (Fig. 4).
  • compressed air is sent through the conduits 9 to allow the part 7 to take off.
  • Two sectional views along lines 7 and 8 show that the excess surfaces of material, during the forming of the corner 13, have been moved towards the base 13a of the corner of the part in a manner corresponding to the relief shapes. 11 of the peripheral matrix 10. Thereafter an operation of trimming the part makes it possible to eliminate the undesirable edges 15 and to give it its final shape.
  • a rectangular parallelepiped (as shown in FIG. 6) can be produced starting from a flat rectangular sheet (shown in FIG. 9) by folding FIG. 10) on the condition of cutting a square 50 at each corner of the sheet.
  • this square 50 exists and represents excess material.
  • the aim of the present invention is to avoid the formation of any excess thickness or thinning which would risk generating folds or tears, in particular in ultra-thin sheets having in particular deep angular volumes.
  • the stamping die has at each of its angles a suitable shape in relief 11 which will form in hollow at the base of each of the angles of the part to obtain a progressive concave shape of surface equivalent to the excess of material , for example, the square 50 mentioned in the previous paragraph (forming a rectangular parallelepiped).
  • the device according to the invention is adaptable to existing double-acting presses.
  • the invention may prove to be particularly useful for the production of ultra-thin sheet steel of automobile body parts, of aircraft fuselage, etc .; but it can also be applied to the stamping of thicker sheets of various metals.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Paper (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Control Of Presses (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)
  • Facsimile Transmission Control (AREA)
EP85400946A 1984-05-17 1985-05-14 Procédé et dispositif d'emboutissage de tôles Expired - Lifetime EP0165133B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85400946T ATE102510T1 (de) 1984-05-17 1985-05-14 Verfahren und vorrichtung zum formstanzen einer metallplatte.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8407678A FR2564339B1 (fr) 1984-05-17 1984-05-17 Procede et dispositif d'emboutissage de toles.
FR8407678 1984-05-17

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP87104914.4 Division-Into 1985-05-14

Publications (2)

Publication Number Publication Date
EP0165133A1 EP0165133A1 (fr) 1985-12-18
EP0165133B1 true EP0165133B1 (fr) 1994-03-09

Family

ID=9304091

Family Applications (2)

Application Number Title Priority Date Filing Date
EP87104914A Expired - Lifetime EP0238099B1 (fr) 1984-05-17 1985-05-14 Procédé et dispositif d'emboutisage de tôles
EP85400946A Expired - Lifetime EP0165133B1 (fr) 1984-05-17 1985-05-14 Procédé et dispositif d'emboutissage de tôles

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP87104914A Expired - Lifetime EP0238099B1 (fr) 1984-05-17 1985-05-14 Procédé et dispositif d'emboutisage de tôles

Country Status (13)

Country Link
US (1) US4833903A (ko)
EP (2) EP0238099B1 (ko)
JP (2) JPS6138721A (ko)
KR (1) KR930004864B1 (ko)
AT (2) ATE102510T1 (ko)
AU (1) AU581659B2 (ko)
BR (2) BR8502328A (ko)
CA (1) CA1296581C (ko)
DE (2) DE3587770T2 (ko)
ES (2) ES8701546A1 (ko)
FR (1) FR2564339B1 (ko)
MX (1) MX163280B (ko)
ZA (1) ZA853618B (ko)

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FR2590814B1 (fr) * 1985-12-04 1988-02-26 Usinor Procede et dispositif d'emboutissage de toles a faible allongement
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GB2208619B (en) * 1987-08-15 1991-11-13 Austin Rover Group A sheet metal drawing tool and methods of making and using same.
FR2641215A1 (fr) * 1988-12-30 1990-07-06 Isoform Dispositif d'emboutissage de materiaux en feuilles
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
US5353618A (en) 1989-08-24 1994-10-11 Armco Steel Company, L.P. Apparatus and method for forming a tubular frame member
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US5157969A (en) * 1989-11-29 1992-10-27 Armco Steel Co., L.P. Apparatus and method for hydroforming sheet metal
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US5406823A (en) * 1991-01-18 1995-04-18 Nam Lee Industries (Pte) Ltd. Method of producing a main frame for a shipping container
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.
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DE20021924U1 (de) * 2000-12-21 2001-05-10 Reinecke Frank CD-Verpackung (Karte)
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US8118197B2 (en) * 2007-06-18 2012-02-21 Precision Valve Corporation Method of making aerosol valve mounting cups and resultant cups
EA012124B1 (ru) * 2007-08-07 2009-08-28 Общество С Дополнительной Ответственностью "Кузовные Детали" Способ формообразования изделий из листового материала и приспособление для его осуществления
JP4386130B2 (ja) * 2007-11-30 2009-12-16 トヨタ自動車株式会社 プレス装置用金型および開放絞り成形方法
US8556618B2 (en) * 2011-04-07 2013-10-15 Spirit Aerosystems, Inc. Method and bladder apparatus for forming composite parts
DE102012101853A1 (de) 2012-03-06 2013-09-12 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren zur Herstellung eines Blechteils sowie Umformvorrichtung und Blechteil mit einem umgeformten Randbereich
FR2991203B1 (fr) * 2012-06-01 2015-06-26 Peugeot Citroen Automobiles Sa Presse d'emboutissage de pieces en tole dont le presseur comporte des elements en elastomere.
FR3005880B1 (fr) * 2013-05-22 2015-05-29 Peugeot Citroen Automobiles Sa Procede d'emboutissage d'une piece, notamment de carrosserie de vehicule automobile, a prise de pince amelioree
TWI583456B (zh) * 2013-11-05 2017-05-21 王正平 溝槽型精密下料裝置
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
TWI599476B (zh) * 2015-06-16 2017-09-21 National Kaohsiung First Univ Of Science And Technology Molding mold with rubber pressure plate
CN105215192A (zh) * 2015-11-06 2016-01-06 北京动力机械研究所 一种薄壁深抛物线形拉伸件单模成形装置及方法
CN112775271B (zh) * 2020-12-24 2023-05-23 中航贵州飞机有限责任公司 一种钣金零件橡皮冲孔、制槽的工艺方法
CN113560827B (zh) * 2021-08-17 2022-09-20 浙江盛林汽车部件有限公司 一种汽车底盘用套管的拉伸成型工艺

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Also Published As

Publication number Publication date
CA1296581C (en) 1992-03-03
ATE67941T1 (de) 1991-10-15
DE3584291D1 (de) 1991-11-07
DE3587770T2 (de) 1994-10-27
DE3587770D1 (de) 1994-04-14
EP0238099A2 (fr) 1987-09-23
BR8502328A (pt) 1986-01-21
JPH0536133B2 (ko) 1993-05-28
AU581659B2 (en) 1989-03-02
JPS6138721A (ja) 1986-02-24
ZA853618B (en) 1985-12-24
FR2564339A1 (fr) 1985-11-22
ES557038A0 (es) 1987-05-01
EP0238099A3 (en) 1989-08-09
KR930004864B1 (ko) 1993-06-09
BR8705581A (pt) 1990-05-01
ES8704769A1 (es) 1987-05-01
ATE102510T1 (de) 1994-03-15
JPH02165822A (ja) 1990-06-26
FR2564339B1 (fr) 1987-12-24
JPH0224610B2 (ko) 1990-05-30
ES543907A0 (es) 1986-12-16
KR850008115A (ko) 1985-12-13
MX163280B (es) 1992-03-31
EP0165133A1 (fr) 1985-12-18
ES8701546A1 (es) 1986-12-16
US4833903A (en) 1989-05-30
AU4260885A (en) 1985-11-21
EP0238099B1 (fr) 1991-10-02

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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