EP0238099B1 - Procédé et dispositif d'emboutisage de tôles - Google Patents

Procédé et dispositif d'emboutisage de tôles Download PDF

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Publication number
EP0238099B1
EP0238099B1 EP87104914A EP87104914A EP0238099B1 EP 0238099 B1 EP0238099 B1 EP 0238099B1 EP 87104914 A EP87104914 A EP 87104914A EP 87104914 A EP87104914 A EP 87104914A EP 0238099 B1 EP0238099 B1 EP 0238099B1
Authority
EP
European Patent Office
Prior art keywords
sheet
press ram
support
central
active part
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
EP87104914A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0238099A3 (en
EP0238099A2 (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
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 filed Critical Sollac SA
Priority to AT87104914T priority Critical patent/ATE67941T1/de
Publication of EP0238099A2 publication Critical patent/EP0238099A2/fr
Publication of EP0238099A3 publication Critical patent/EP0238099A3/fr
Application granted granted Critical
Publication of EP0238099B1 publication Critical patent/EP0238099B1/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 present invention relates to a method and a device for stamping sheets, in particular extra-thin steel sheets of large dimensions which can be used for example in the automobile industry, or comprising shapes having relatively closed dihedral angles.
  • a method according to the preamble of claim 1 and a device according to the preamble of claim 5 are known from "Professional technology of working metals in sheets, tubes, profiles", G. Cotant, published by Dunod, Paris, France, 1976 , page 200 to 203.
  • 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 55/100 mm approximately, 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 sliders, a central slider, called a plunger carrying a punch, and an external slider reserved for blank holding 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 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 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.
  • the object of the invention is therefore to provide a technology making it possible to stamp metal sheets having angular volumes and in particular extra-thin steel sheets ( ⁇ 50/100 mm), in large series and under competitive economic conditions.
  • high elastic limit steel sheets HLE is meant steels for which E> 350 MPa.
  • the subject of the invention is therefore a process for stamping sheets of substantially constant thickness, on a double-acting press, according to claim 1.
  • the invention is based on the principle of the equality of the surfaces of the initial flat sheet metal blank and the shaped blank strictly corresponds to the shape of the desired stamped part, increased by the excess peripheral surfaces shaped under blank holder, thus conditioning the maintenance of a substantially constant thickness of the sheet of equal stress.
  • the invention also relates to a stamping device according to claim 5.
  • the active part in relief of the external slide is carried by a movable element in translation independent of the external slide, which cooperates with a complementary shape provided in the support.
  • 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 slider or blank holder 1 carrying a peripheral part 10 and a central slider 2 forming a punch are in the high position, while the sheet blank 7 to be formed is placed on a support 4 forming a matrix.
  • the peripheral part 10 comprises in its corners active parts in relief 11 carried by elements or candles 30 movable in translation in corresponding housings formed in the blank holder 1.
  • the active parts in relief 11 have an appropriate shape which corresponds to the surface excess in relation to the volume to be formed of the part which it is desired to produce, for example as illustrated in FIG. 11.
  • the support 4 made of a hard material, for example metallic, forms the matrix and includes a peripheral part 31 in which recessed parts 32 are formed corresponding to the complementary shape of the active parts in relief 11 of the candles 30.
  • the central part 33 of the support 4 constitutes the bottom of the matrix and has the shape of the finished part in its central zone.
  • the peripheral part 10 of the outer slide 1 has on its outer edges shims 34 bearing on the peripheral part 31 of the support 4 so as to allow, although the sheet metal blank 7 is maintained, the displacement by sliding of the excess material in the cooperating parts 11, 32.
  • the step in FIG. 1 constitutes the step of placing the sheet blank 7, the external slide of the blank holder 1 being raised as well as the mobile elements 30 and the central slide 2.
  • Fig. 2 shows the step of bringing the blank holder into contact with the sheet 7, by lowering the outer slide 1 and the punch 2. During this step, the mobile elements 30 do not move and retract into the clamp. blank relative to their initial projecting position, so that the sheet is not stressed by any deformation and only undergoes the tightening operation controlled at its periphery by the blank holder.
  • Fig. 3 illustrates a stage of active shaping of the part, in which there is a simultaneous descent and in relation to one another of the mobile elements 30 and of the punch 2 so as to gradually absorb the excess surface in certain areas of the part to be formed thanks to the active part 11 and its complementary part 32, while maintaining the sheet metal stretched over the punch by controlled sliding under the blank holder.
  • the active part of the punch has reached the bottom of the die 33 and the movable elements 30 also have their active parts 11 which cooperate with the complementary parts 32 by enclosing the sheet 7 and thus having absorbed the excess surfaces of sheet relative to to the volume of the finished part to be formed, thus avoiding the formation of folds, shrinking or thinning at any point whatever the thickness of the sheet.
  • the device shown in Figs. 5 to 9 illustrates a second variant of the method and the device according to the present invention in which the movement relative simulated and coordinated active parts in relief 11 of the peripheral slide 1 and the central slide 2 is obtained.
  • the device of FIG. 5 in the position before forming comprises the usual constituent elements of a double-acting press which have already been described and bear the same references as above.
  • the outer slider 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 of the volume to be form the part that you want to make, for example as illustrated in Fig. 11) 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 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).
  • a support 4 disposed in a container 3 (tray).
  • the support made of an easily flowable elastic material plays the role of punch by deformation.
  • the support 4 consists of 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 great plasticity, for example silicone elastomers, or cellular foams, the cells of which can be filled with liquid.
  • a composite support consisting of a substantially parallelepipedal 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 shore hardness silicone 50 or 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 to facilitate 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.
  • provision may also be made embedded metal wires or a metal powder filler improving thermal conductivity.
  • Fig. 6 shows the pre-forming step of the part.
  • the blank-holding slide 1 is lowered carrying the peripheral matrix 10.
  • the latter comes into contact with the sheet blank 7 which reacts by compressing 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, 16 so that the deformation in its central part of the sheet blank gives a surface which is substantially equal to that of the finished part to be obtained.
  • Fig. 7 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. 8 represents the step of decompression of the elastomer support 4 by withdrawal of the candles 5. This operation aims to avoid the deformation of the stamped part by expansion reaction of the elastomer.
  • Fig. 9 represents the step of releasing the formed part 7, by simultaneous ascent of the two slides 1 and 2 carrying the dies.
  • compressed air is circulated in the conduits 6.
  • the support 4 can also be cooled during the previous decompression step ( Fig. 8).
  • compressed air is sent through the conduits 9 to allow the part 7 to take off.
  • the outer slider or blank holder 1 is of the type illustrated by the first variant, namely, it has active parts in relief 11 carried by elements movable in translation in housings formed in the blank holder 1.
  • the mobile elements 30 descend simultaneously and in relation to the movement of the punch so as to obtain the same effect as that described for the first variant .
  • Two sectional views along lines 12 and 13 show that the excess surfaces of material, during the forming of the corner 13, have been displaced towards the base 13a of the corner of the part in a manner corresponding to the relief shapes. 11 of the peripheral matrix 10. Subsequently an operation of trimming the part makes it possible to eliminate the undesirable edges 15 and to give it its final shape.
  • 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)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Paper (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)
  • Facsimile Transmission Control (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)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP87104914A 1984-05-17 1985-05-14 Procédé et dispositif d'emboutisage de tôles Expired - Lifetime EP0238099B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87104914T ATE67941T1 (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
FR8407678 1984-05-17
FR8407678A FR2564339B1 (fr) 1984-05-17 1984-05-17 Procede et dispositif d'emboutissage de toles.

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP85400946.1 Division 1985-05-14

Publications (3)

Publication Number Publication Date
EP0238099A2 EP0238099A2 (fr) 1987-09-23
EP0238099A3 EP0238099A3 (en) 1989-08-09
EP0238099B1 true EP0238099B1 (fr) 1991-10-02

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 After (1)

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

Country Status (13)

Country Link
US (1) US4833903A (ja)
EP (2) EP0238099B1 (ja)
JP (2) JPS6138721A (ja)
KR (1) KR930004864B1 (ja)
AT (2) ATE67941T1 (ja)
AU (1) AU581659B2 (ja)
BR (2) BR8502328A (ja)
CA (1) CA1296581C (ja)
DE (2) DE3584291D1 (ja)
ES (2) ES8701546A1 (ja)
FR (1) FR2564339B1 (ja)
MX (1) MX163280B (ja)
ZA (1) ZA853618B (ja)

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DE20021924U1 (de) * 2000-12-21 2001-05-10 Reinecke Frank CD-Verpackung (Karte)
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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
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Also Published As

Publication number Publication date
BR8502328A (pt) 1986-01-21
KR850008115A (ko) 1985-12-13
DE3587770T2 (de) 1994-10-27
DE3587770D1 (de) 1994-04-14
BR8705581A (pt) 1990-05-01
FR2564339B1 (fr) 1987-12-24
EP0238099A3 (en) 1989-08-09
ES8701546A1 (es) 1986-12-16
DE3584291D1 (de) 1991-11-07
ZA853618B (en) 1985-12-24
JPS6138721A (ja) 1986-02-24
MX163280B (es) 1992-03-31
AU4260885A (en) 1985-11-21
JPH02165822A (ja) 1990-06-26
JPH0224610B2 (ja) 1990-05-30
EP0238099A2 (fr) 1987-09-23
KR930004864B1 (ko) 1993-06-09
ATE102510T1 (de) 1994-03-15
EP0165133A1 (fr) 1985-12-18
ATE67941T1 (de) 1991-10-15
CA1296581C (en) 1992-03-03
FR2564339A1 (fr) 1985-11-22
AU581659B2 (en) 1989-03-02
ES557038A0 (es) 1987-05-01
US4833903A (en) 1989-05-30
JPH0536133B2 (ja) 1993-05-28
EP0165133B1 (fr) 1994-03-09
ES543907A0 (es) 1986-12-16
ES8704769A1 (es) 1987-05-01

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