EP0664168B1 - Vorrichtung zum Tiefziehen eines Blechzuschnittes - Google Patents

Vorrichtung zum Tiefziehen eines Blechzuschnittes Download PDF

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Publication number
EP0664168B1
EP0664168B1 EP95400079A EP95400079A EP0664168B1 EP 0664168 B1 EP0664168 B1 EP 0664168B1 EP 95400079 A EP95400079 A EP 95400079A EP 95400079 A EP95400079 A EP 95400079A EP 0664168 B1 EP0664168 B1 EP 0664168B1
Authority
EP
European Patent Office
Prior art keywords
cushion
blank
sheet metal
metal blank
temperature
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
EP95400079A
Other languages
English (en)
French (fr)
Other versions
EP0664168A1 (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.)
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
Publication of EP0664168A1 publication Critical patent/EP0664168A1/de
Application granted granted Critical
Publication of EP0664168B1 publication Critical patent/EP0664168B1/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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/021—Deforming sheet bodies
    • 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
    • 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
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/014—Expansible and collapsible
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/11—Heated mold

Definitions

  • the present invention relates to a device for stamping a sheet blank on a forming matrix of elastic material.
  • FR-A-2 641 215 and FR-A-2 641 217 devices for stamping sheet metal blanks, of the type comprising a cushion of elastic material housed in a retention tank and on which a lower blank holder, means for preforming the sheet blank, constituted by an external slider carrying an upper blank holder and means for definitive forming of said sheet blank, constituted by a central slide acting on a plunger.
  • the cushion of elastic material may be a composite support of a substantially parallelepipedal mass based on a silicone elastomer of low Shore hardness, optionally covered on its upper face, and on all or part of its lateral faces with a relatively thin shell made of more resistant and harder material.
  • the upper blank holder applied to the peripheral part of the sheet blank causes the mass of the elastic cushion to creep in order to deform the central part of said sheet blank, while giving it, at the end of 'preforming step, an area substantially equal to the area of the part to be obtained.
  • the descent of the plunger for the final shaping of the sheet blank causes an increase in pressure in the cushion and a difference in volume in said cushion between the preforming step and the shaping step, which it is necessary to compensate in order to d '' avoid an increase in pressure in the cushion.
  • the device according to FR-A-2 641 217 comprises means for absorbing the excess volume of the cushion relative to that determined by the surface of the finished part to be obtained.
  • absorption means are movable during the final forming of the part and this displacement is regulated by a regulating member constituted for example by a multi-blade brake or a spring, or even a jack.
  • This known device makes it possible to absorb the large, constant and defined volume differences during the first press cycle for a geometry of the parts to be formed and at a given temperature.
  • this device has the drawback of not responding to the problem of a progressive, even small, increase in volume of the cushion.
  • This increase may be due to variations in the physical characteristics of the material constituting the cushion, such as for example a continuous heating of several tens of degrees, generated by the deformation of the cushion under the action of the upper blank holder whose stroke can represent 20 % of the empty height of the cushion during the production of parts with a high press rate, that is to say greater than ten cycles per minute.
  • This second means of compensating for the excess volume of the cushion comprises, on the one hand, at least one sliding member housed in a chamber opening into the retention tank of the cushion and intended to cooperate with said cushion and, on the other hand, a member regulating the movement of the sliding member interposed between said sliding member and the bottom of said chamber.
  • EP-A-0 165 133 is a device for stamping a sheet blank comprising a matrix formed by a cushion made of an elastic material, means for preforming the sheet blank consisting of an external slide bearing an upper blank holder, sheet blank forming means constituted by a central slide acting on a plunger and cooling fluid circulation conduits incorporated in the material constituting the cushion and intended to limit the heating of this cushion.
  • the object of the invention is the manufacture of parts with a press operating at a high rate without requiring a modification of the setting of said press during the forming operations.
  • the invention therefore relates to a device for stamping a sheet blank, comprising a matrix formed by a cushion made of an elastic material such as for example an elastomer, housed in a retention tank, a lower blank holder in support. on the upper part of said tank and on which the sheet blank rests, means for preforming the sheet blank, constituted by an external slide carrying a top blank clamp, and means for forming the sheet blank, constituted by a slide central acting on a plunger, characterized in that it comprises, at the heating zones of the elastic cushion, means of regulating the temperature of said cushion during the drawing of the sheet blank arranged in the lower blank clamp.
  • a device for stamping a sheet blank comprising a matrix formed by a cushion made of an elastic material such as for example an elastomer, housed in a retention tank, a lower blank holder in support. on the upper part of said tank and on which the sheet blank rests, means for preforming the sheet blank, constituted by an external slide carrying a top blank clamp, and means
  • the stamping device shown in the figures comprises a retention tank 1, the central part of which constitutes a housing for a matrix formed by a cushion 2 made of an elastic material, such as for example an elastomer.
  • a lower peripheral blank holder 3 On the upper face of the cushion 2 and of the tank 1 is arranged a lower peripheral blank holder 3.
  • the tank 1 is mounted to slide vertically and cooperates with a member 4 for regulating the movement of said tank 1 and of the lower blank holder 3.
  • This regulating member 4 is formed for example by a spring system or a jack.
  • a sheet blank 5 is placed on the lower blank clamp 3.
  • the stamping device comprises a body 6 carried by an external slide, not shown, and the lower part of which constitutes an upper peripheral blank holder 6a.
  • the upper peripheral blank holder 6a cooperates with the lower blank holder 3 to clamp, in localized areas, the sheet blank 5.
  • the body 6 has a central well inside which a plunger 7 penetrates, the underside of which constitutes an imprint corresponding to the profile of the finished part to be obtained.
  • the device also comprises a means 10 for absorbing the excess volume of the elastic cushion 2 generated by the application of the plunger 7 relative to that determined by the surface of the finished part to be obtained during the final forming of said part.
  • This means 10 is constituted, in this embodiment, by a piston 11 movable vertically constituting the bottom of the retention tank 1 which has for this purpose a central opening.
  • the piston 11 has its upper surface applied against the cushion 2 and cooperates with a regulating member 12 for the movement of the piston.
  • This regulating member 12 shown diagrammatically in the figures, is constituted for example by a multi-blade brake or a spring or even a jack.
  • the body 6 is lowered by means of the external slide, not shown, from the press, so that the upper blank holder 6a comes into contact with the sheet blank 5 whose peripheral zone is progressively clamped between the lower blank holder 3 and the upper blank holder 6a.
  • the upper blank holder 6a compresses the elastic cushion 2 by reaction.
  • the swelling of the central part of the sheet blank 5 is limited by the bottom of the plunger 7 in order to avoid uncontrolled deformations.
  • the retention tank 1 descends and compresses the regulating member 4 while the regulating member 12 prevents the displacement of the movable piston 11 under the effect of the pressure exerted by the elastic cushion 2 and, consequently, prevents said elastic cushion 2 from creeping down.
  • the plunger 7 descends to its low position and controls the final forming of the central part of the sheet blank 5 preformed during the previous operation.
  • the regulating member 12 ensures the adjustment of the displacement of the piston 11 and, therefore, makes it possible to absorb the excess volume of the elastic cushion 2 generated by the application of the plunger 7.
  • Such a device makes it possible to absorb large and constant volume differences defined from the first press cycle calculated as a function of the part to be formed.
  • the variations in temperature of the cushion are to a large extent linked to large deformations of said cushion, to the friction particularly localized in the areas surrounding the lower blank holder 3 and not to the overall deformation of the total volume of the elastic cushion 2.
  • the stamping device comprises, at the level of the heating zones of the elastic cushion 2, means 20 for regulating the temperature of said elastic cushion 2 during the stamping of the blank sheet 5.
  • the areas around the lower blank holder 3 are subjected to localized cooling by the regulation means 20 which are, according to a first embodiment shown in FIGS. 1 to 3, formed by pipes 21 for circulation of a heat-transfer fluid , such as water.
  • the pipes 21 are incorporated in the lower blank holder 3 at the interior part of said lower blank holder 3 intended to be in contact with the elastic cushion 2.
  • These pipes 21 are connected to a pipe 22 for supplying the heat transfer fluid and to a pipe 23 for the return of said heat transfer fluid.
  • the face 3a of the lower blank holder 3 intended to be in contact with the elastic cushion 2 is rounded so as to reduce the heating by friction and may include an anti-friction coating.
  • conduits 21 for circulation of the heat-transfer fluid are arranged in a ring 25 provided on the inner part of the lower blank holder 3, intended to be in contact with the elastic cushion 2.
  • the crown 25 is made of a material having, on the one hand, a thermal conductivity greater than the thermal conductivity of the other part of the blank holder 3 and, on the other hand, a low coefficient of friction.
  • the face 25a of the crown 25 intended to be in contact with the elastic cushion 2 is rounded so as to reduce the heating by friction and may include an anti-friction coating.
  • the material of the crown 25 can be chosen from steel, aluminum, copper, an aluminum alloy or a copper alloy.
  • the means 20 for regulating the temperature of the elastic cushion 2 can be formed by pipes 21 for circulation of a heat-transfer fluid, incorporated in the lower blank holder 3 as before and by conduits 30 for circulation of a heat-transfer fluid, arranged below the lower blank holder 3 in a casing 8 placed between the elastic cushion 2 and a work mat 9 covering the upper face of said elastic cushion 2.
  • the pipes 31 are for example constituted by flexible pipes.
  • the cushion 2 can be formed by several superimposed layers of elastic material forming between them passages forming the pipes for circulation of the heat transfer fluid.
  • the means for regulating the temperature of the elastic cushion 2 can also be used in a device for stamping sheet blanks in which the preforming and shaping steps are carried out in a single step.
  • the means for regulating the temperature of the elastic cushion prevent overheating and significant expansion of this cushion and, consequently, any increase in pressure in said cushion, which makes it possible to use the stamping device according to the invention in manufacturing. of parts in large series.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Claims (5)

  1. Vorrichtung zum Tiefziehen eines Blechrohlings (5) mit einer Matrize, die aus einem Kissen (2) aus einem elastischen Material, beispielsweise einem Elastomer, besteht, das in einem Haltekasten (1) angeordnet ist, einem unteren Rohlingshalter (3), der an dem oberen Bereich des Kastens (1) anliegt und auf dem der Blechrohling (5) liegt, Einrichtungen zum Vorformen des Blechrohlings (5), bestehend aus einem äußeren Gleitstück (6) mit einem oberen Rohlingshalter (6a) und Einrichtungen zum Formen des Blechrohlings (5), bestehend aus einem mittleren Gleitstück, das aufeinen Stempel (7) wirkt, dadurch gekennzeichnet, daß sie in den Zonen der Erwärmung des elastischen Kissens (2) in dem unteren Rohlingshalter (3) angeordnete Einrichtungen (20) zur Regelung der Temperatur des Kissens (2) im Verlauf des Tiefziehens des Blechrohlings (5) aufweist.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Einrichtungen (20) zur Regelung der Temperatur des elastischen Kissens (2) in einem Kranz (25) angeordnet sind, der auf dem in Kontakt mit dem elastischen Kissen (2) befindlichen Innenteil des unteren Rohlingshalters (3) angeordnet ist.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Kranz (25) aus einem Material besteht, das einerseits eine bessere Wärmeleitfähigkeit als der andere Teil des unteren Rohlingshalters (3) und andererseits einen niedrigen Reibungskoeffizienten hat.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das Material des Kranzes (25) unter den Materialien Stahl, Aluminium, Kupfer, einer Aluminiumlegierung oder einer Kupferlegierung ausgewählt ist.
  5. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Einrichtungen (20) zur Regelung der Temperatur des elastischen Kissens (2) aus Umlaufleitungen (21, 30) für ein Wärmeträgerfluid bestehen.
EP95400079A 1994-01-21 1995-01-16 Vorrichtung zum Tiefziehen eines Blechzuschnittes Expired - Lifetime EP0664168B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9400666 1994-01-21
FR9400666A FR2715335B1 (fr) 1994-01-21 1994-01-21 Dispositif d'emboutissage d'un flan de tôle.

Publications (2)

Publication Number Publication Date
EP0664168A1 EP0664168A1 (de) 1995-07-26
EP0664168B1 true EP0664168B1 (de) 1997-10-29

Family

ID=9459276

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95400079A Expired - Lifetime EP0664168B1 (de) 1994-01-21 1995-01-16 Vorrichtung zum Tiefziehen eines Blechzuschnittes

Country Status (6)

Country Link
US (1) US5599565A (de)
EP (1) EP0664168B1 (de)
JP (1) JPH0833929A (de)
DE (1) DE69500933T2 (de)
ES (1) ES2110814T3 (de)
FR (1) FR2715335B1 (de)

Families Citing this family (18)

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Publication number Priority date Publication date Assignee Title
US5966976A (en) * 1997-11-19 1999-10-19 Amada Metrecs Company, Limited Compression working method and compression working apparatus
US6029486A (en) * 1998-04-23 2000-02-29 Amada Metrecs Company, Limited Forming method, forming tools and elastic punch
US6245274B1 (en) * 1998-03-02 2001-06-12 The United States Of America As Represented By The Secretary Of The Air Force Method for making advanced grid-stiffened structures
DE19819761C2 (de) * 1998-05-04 2000-05-31 Jenoptik Jena Gmbh Einrichtung zur Trennung eines geformten Substrates von einem Prägewerkzeug
US6413068B1 (en) 2000-07-10 2002-07-02 The Goodyear Tire & Rubber Company Tire mold heat transfer system
JP2006312260A (ja) * 2005-05-09 2006-11-16 Fuji Heavy Ind Ltd プリプレグの折曲成形装置及びその折曲成形方法
JP5028576B2 (ja) * 2006-11-17 2012-09-19 新潟県 マグネシウム合金板の塑性加工方法
ITMC20090202A1 (it) * 2009-09-22 2011-03-23 Wolfango Alpini Attrezzatura e metodo per lo stampaggio di materiale in foglio, in particolare lastre metalliche.
CN102274898A (zh) * 2011-08-17 2011-12-14 机械科学研究总院先进制造技术研究中心 一种可调节的自适应式热冲压模具板料定位支撑装置
KR101316424B1 (ko) * 2011-11-25 2013-10-14 현대자동차주식회사 냉각 효율이 향상된 핫 스템핑용 금형 및 이의 제조방법
WO2014051014A1 (ja) 2012-09-28 2014-04-03 東芝機械株式会社 成形装置及び成形方法
KR102022287B1 (ko) * 2013-03-08 2019-09-19 삼성전자주식회사 프레스 금형
JP6116366B2 (ja) * 2013-05-22 2017-04-19 東芝機械株式会社 金型組
CN107755511A (zh) * 2016-08-19 2018-03-06 北京航空航天大学 一种针对薄壁零件小圆角特征的胀压复合成形方法
JP6798380B2 (ja) * 2017-03-22 2020-12-09 日本製鉄株式会社 キャラクターラインを有するパネルの製造装置および製造方法
US10773291B2 (en) * 2017-05-24 2020-09-15 Polyurethane Products Universal radius forming system
CN107716735A (zh) * 2017-09-30 2018-02-23 苏州瑞宣达金属制品有限公司 一种金属制品生产用高速冲床的散热垫
SE545309C2 (en) * 2018-11-05 2023-06-27 Pulpac AB Forming mould system and method for forming three-dimensional cellulose products

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FR2691653B1 (fr) * 1992-05-27 1994-08-26 Isoform Dispositif d'emboutissage de matériaux en feuille sur une matrice de formage en matériau élastique.

Also Published As

Publication number Publication date
DE69500933D1 (de) 1997-12-04
ES2110814T3 (es) 1998-02-16
FR2715335A1 (fr) 1995-07-28
US5599565A (en) 1997-02-04
DE69500933T2 (de) 1998-06-18
FR2715335B1 (fr) 1996-04-05
EP0664168A1 (de) 1995-07-26
JPH0833929A (ja) 1996-02-06

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