EP1396297B1 - Dispositif et procédé d' emboutissage - Google Patents

Dispositif et procédé d' emboutissage Download PDF

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Publication number
EP1396297B1
EP1396297B1 EP20020020094 EP02020094A EP1396297B1 EP 1396297 B1 EP1396297 B1 EP 1396297B1 EP 20020020094 EP20020020094 EP 20020020094 EP 02020094 A EP02020094 A EP 02020094A EP 1396297 B1 EP1396297 B1 EP 1396297B1
Authority
EP
European Patent Office
Prior art keywords
deep
acting
blank
drawing device
rod
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 - Fee Related
Application number
EP20020020094
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German (de)
English (en)
Other versions
EP1396297A1 (fr
Inventor
Carsten Greisert
Torsten Hallfeldt
Jürgen Wesemann
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.)
Ford Global Technologies LLC
Original Assignee
Ford Global Technologies LLC
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 Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Priority to EP20020020094 priority Critical patent/EP1396297B1/fr
Priority to DE50203897T priority patent/DE50203897D1/de
Publication of EP1396297A1 publication Critical patent/EP1396297A1/fr
Application granted granted Critical
Publication of EP1396297B1 publication Critical patent/EP1396297B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
    • 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
    • B21D22/20—Deep-drawing
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks

Definitions

  • the invention relates to a thermoforming device for deep drawing of metallic, sheet-metal blanks or blank, hereinafter referred to as blanks, essentially comprising a punch, a hold-down and a Thermoforming mold, and comprising at least one of the metallic, sheet-like Board acting, in particular individually adjustable, integrated in the stamp Drawing rod, according to the preamble of claim 1.
  • the invention also relates to a method for deep drawing of metallic, sheet-like boards according to the preamble of claim 21.
  • thermoforming devices and methods are known in the art for deep drawing metallic, sheet-like boards known.
  • the well-known Deep drawing devices and methods for deep drawing are also used for the production used by bodywork elements. It is doing while deep drawing boards with a high material strength (eg HSLA 340, DP600) or of boards with a compared to steel lower modulus of elasticity (e.g., aluminum) the geometric Accuracy by jumping back, rebounding or rebounding of the material or deteriorated by wrinkling.
  • the thermoforming mold has been integrated to prevent springing back and wrinkling to reduce.
  • the disadvantage here is that the formability is also reduced. So is z. B.
  • US Pat. No. 6,276,185 B1 likewise discloses a deep-drawing device or a method known for deep drawing, wherein in the hold of the thermoforming device several drawing rods are provided for controlling the deep-drawing process.
  • this Trap to be processed boards are a two-stage deep drawing process subjected in the first step in particular the edge areas processed and in the second step, the deep drawing process is completed, and here too different drawing depths over the length may be provided.
  • JP 58157531 a deep-drawing device is described which has an embossing stamp having as part of a thermoforming mold a door handle recess in a door panel of a Motor vehicle depresses.
  • the door handle mold is part of the stamp for the entire door panel. So that in the edge area around the door handle recess no wrinkles or Waves when deep drawing occur, are movable around the die Hold-down arranged. These hold the door panel down before the Damping die dips into the door handle recess shape. The hold-downs themselves become by elastic elements, which are stored in the thermoforming mold, on the stamp pressed.
  • a Deep-drawing tool with an integrated hold-down known.
  • the deep-drawing tool comprises a punch, a die and a hold-down, the hold-down fastened directly to the punch and throughout the entire Forming process is in contact with the sheet metal blank.
  • the hold-down can do this be formed and arranged differently, can continue to be additional, with the hold-down in operative connection elements such as spacers, Brake elements or the like. Be provided.
  • thermoforming devices and methods for Deep drawing of metal, sheet-like boards is the object of the invention underlying the known arrangements and methods while maintaining the previous advantages in such a way to improve or develop that a good deformability of the thermoforming circuit boards is given and still the geometric accuracy not by jumping back the material is worsened, i. Jumping back the material should be significantly reduced or possibly prevented.
  • thermoforming device according to the invention by a thermoforming device with the features of claim 1.
  • thermoforming device with the features of claim 1.
  • simple means the possibility created to provide a good formability of the deep-drawing board and nevertheless to ensure that at the same time the geometric accuracy is not through jumping back the material is deteriorated because with the inventive Arrangement a jumping back of the material during deep drawing process considerably is reduced or prevented.
  • the advantage of the arrangement according to the invention is esp.
  • the material flow controlling device at the beginning of the deep-drawing process in order to achieve a good formability with a significantly increased, the material flow inhibiting and reduced or inhibiting device at the end of the thermoforming process for Reduction or avoidance of a shape deviation by jumping back the deep-drawn board.
  • an or several individually adjustable drawing rods directly in or on the stamp of Deep-drawing device integrated or arranged.
  • feature of the present invention is the at least one acting on the metallic, sheet-like board, in particular individually adjustable, directly in the stamp of the thermoforming device integrated pulling rod designed exchangeable.
  • the at least one on the metallic, sheet-like board acting drawing rod in each case located in a stamp of the thermoforming device Bag is arranged.
  • the Height of at least one acting on the metallic sheet-like board Pulling rod is adjustable.
  • the present invention is preferred Invention for functionally correct action of the at least one drawing rod the metallic, sheet-like board an additional, acting on the drawing rod, Force resistance element provided. It is recommended that this on the Pulling rod acting, additional force resistance element formed adjustable is.
  • the force acting on the pull rod, additional force resistance element can expedient by a spring element, in particular a gas spring element, be formed.
  • the deep drawing device be provided an active hydraulic force control.
  • thermoforming mold in the essentially just be trained.
  • thermoforming mold takes the place of each acting draw bar each have an additional cavity.
  • the at least one pulling rod at its for hollowing the Thermoforming side facing a convex and the cavity itself one corresponding concave configuration has.
  • the at least one pulling rod at its for Hollowing the thermoforming mold directed side a substantially rectangular and the cavity itself is also of a corresponding rectangular shape Embodiment has.
  • feature of the present invention is the at least one pulling rod each firmly in the on the stamp of the thermoforming device set pocket. It is recommended that to adjust the Height of the fixed in the bag located on the stamp puncture rod in the pocket inserted intermediate plates are formed.
  • a movable insert is provided on the one Force resistance element acts. It can do this on the mobile use in the cavity of the thermoforming mold acting force resistance element is preferred be designed adjustable. Preference is given to the mobile use acting force resistance element by spring elements, in particular by Gas spring elements, formed, can continue to additional control of movable insert to be provided an active hydraulic force control.
  • the object underlying the invention solved according to the invention by a method having the features of claim 21.
  • This is the first time in procedural Realized that realizes a good formability of the deep-drawing board while still ensuring that at the same time the geometric accuracy is not deteriorated by jumping back the material.
  • the the inventive method underlying advantage lies in particular in the nature of the variation of the material flow controlling deep drawing process.
  • the material flow controlling device engages appropriate in the final part of the deep drawing process the material flow controlling device at a predetermined position on the board, such that the flow of material until the end of the deep drawing process significantly reduced or is inhibited.
  • the deep-drawing device is designated generally by 10.
  • These Deep drawing device 10 is used for deep drawing of metallic, sheet-like boards, wherein the deep-drawing device 10 in particular for the production of Bodywork elements is used.
  • the thermoforming device 10 comprises in essential, see, for. For example, Fig. 1 of the drawing, a stamp 12, a Downholder 13 and a thermoforming mold 14, and further comprises at least one acting on the metallic, sheet-like board 11, preferably individually adjustable, pulling rod 15.
  • the at least one on the metallic, sheet-like board 11 acting, preferably individually adjustable Pulling rod 15 is arranged directly on the punch 12 of the thermoforming device 10.
  • This arrangement is achieved that the arranged directly on the punch 12 respective pulling rod 15 at a predetermined time during the Deep drawing process on the board 11 attacks.
  • the advantage of the invention Arrangement is esp. In the combination of a small inhibitory, the Materialfluß controlling device at the beginning of the thermoforming process in order Achieving good formability with a significantly increased, the material flow controlling device at the end of the deep drawing process to reduce or Avoiding a spring back of the deep-drawn board 11th
  • thermoforming device 10 is to a flat or preformed board 11 placed on the thermoforming mold 14 and the Downholder 13 is closed.
  • the Hold-down 13 controlled by sleeves 23, where the holddown 13 set is.
  • the thermoforming mold 14 is arranged on a spacer 24, which in turn on a here only schematically indicated press table 25 is located.
  • the Stamp 12 is located on a plunger, designated 22, which determines the pulling force, e.g. one here schematically indicated double-acting press device user attention. It but is also a use of the inventive arrangement in other than the shown press arrangements, z. B. single-acting presses, etc., intended.
  • the deep-drawing device 10 and then described the inventive method.
  • the inventive method in the present case are, see again z.
  • the two on the metallic, sheet-like board 11 acting, preferably individually adjustable, directly on the punch 12 of the thermoforming device 10 arranged pulling rods 15 are formed exchangeable, furthermore, the two drawing rods 15 are each in a located on the punch 12 of the thermoforming device 10 pocket 16th arranged, see for example, also Fig. 2 of the drawing.
  • the height of the on the metallic, sheet-like board 11 acting pull rod 15 is present adjustable to change the position of the attack on the board 11 can.
  • the shape of the drawing rod 15 can have any suitable geometry.
  • thermoforming mold 14 formed substantially flat. It is according to the invention but also provided, see the embodiments according to FIGS. 9 to 12 of the drawing, that the thermoforming mold 14 at the location of the respective acting drawing rod 15 respectively an additional cavity 18 has. It can, see the embodiment As shown in FIG. 9, the respective drawing rod 15 at its to the cavity 18 of Deep-drawing mold 14 directed side a convex and the cavity 18 itself one have corresponding concave configuration. Furthermore, see the Embodiments according to FIGS. 10 to 12, the respective drawing rod 15 at its to the cavity 18 of the thermoforming mold 14 side facing a substantially rectangular and the cavity 18 itself also a corresponding kind have rectangular configuration.
  • the drawing rod 15 is fixed in each case the stamp 12 of the thermoforming device 10 located pocket 16 set.
  • this case can be provided that to adjust the height of the fixed in the the stamp 12 located pocket 16 specified pulling rod 15 in the pocket 16th inserted intermediate plates are formed, this embodiment is in the Figures of the drawing not shown.
  • an embodiment with or possible without pockets, where the drawing rods without exchange possibility on Stamp are arranged or integrated in the stamp.
  • a movable insert 20 provided on the one Force resistance element 21 acts.
  • the on this mobile use 20 acting force resistance element 21 is formed adjustable and is in the present case by spring elements, in particular by gas spring elements formed.
  • spring elements in particular by gas spring elements formed.
  • other solutions can also be provided here.
  • an active be provided hydraulic power control.
  • the Material flow controlling device applied to the board 11 to the Deformability of the board 11 to increase.
  • the drawing rods 15 will attack on the surface of the board 11, see the Fig. 5 of the drawing, d. H.
  • the inhibitory, the material flow controlling device by attacking the drawing rods 15 on the board 11 clearly elevated.
  • FIG. 6 the time of the first contact of the drawing rod 15 is to shown with the board 11.
  • the final phase of the thermoforming process engage the drawing rods 15 in a predetermined position on the board 11, and the flow of material is greatly reduced or until the end of the deep-drawing process inhibited, see Fig. 7.
  • thermoforming mold 14 is flat educated.
  • the Deep-drawing mold 14 an additional cavity 18, wherein different here Geometries with respect to the drawing rods 15 and 18 corresponding to the cavity selected can be.
  • the material flow is through this training in the final Part of the deep drawing process additionally inhibited. If in this case the drawing rods 15 at attack the board 11, the material is in this cavity 18 of the thermoforming mold 14, see FIG. 10.
  • the flow of material is inhibited when the distance SDB Drawing rod 15 - cavity 18 is smaller than the original thickness S0 of the board 11, or reduced if the distance SDB pulling rod 15 - cavity 18 is equal to or greater than the original thickness S0 of the board 11 is. This also applies to the Embodiment according to FIG. 11.
  • the deep-drawing device 10 according to the invention or the inventive Method is compared to conventional deep-drawing devices with drawbars or the conventional method, a significant increase in the formability of the Material is reached and at the same time a jumping back of the material is minimized.
  • the attachment of the respective drawing rod 15 according to the invention directly to the Stamp 12 can easily and inexpensively on the punch 12 a Deep-drawing device 10 are integrated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (24)

  1. Dispositif d'emboutissage (10) pour l'emboutissage de flans (11) de type tôles métalliques, comprenant essentiellement une matrice (12), un serre-flan (13) et un moule d'emboutissage (14), et comprenant au moins une barre d'emboutissage (15) agissant sur le flan de type tôle métallique (11), notamment réglable séparément,
    caractérisé en ce que
    l'au moins une barre d'emboutissage (15) agissant sur le flan de type tôle métallique (11), notamment commandable séparément, est disposée directement sur la matrice (12) du dispositif d'emboutissage (10) de telle sorte qu'au début de l'opération d'emboutissage, le flan (11) soit embouti par le biais de la matrice (12) dans un évidement (26) du moule d'emboutissage (14), mais la barre d'emboutissage (15) ne vient toutefois pas en engagement avec le flan (11).
  2. Dispositif d'emboutissage selon la revendication 1,
    caractérisé en ce qu'
    une ou plusieurs barres d'emboutissage réglables (15) sont disposées directement sur la matrice (12) du dispositif d'emboutissage (10).
  3. Dispositif d'emboutissage selon la revendication 1 ou 2,
    caractérisé en ce que
    l'au moins une barre d'emboutissage (15) agissant sur le flan de type tôle métallique (11), notamment réglable séparément, disposée directement sur la matrice (12) du dispositif d'emboutissage (10), est réalisée de manière remplaçable.
  4. Dispositif d'emboutissage selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    l'au moins une barre d'emboutissage (15) agissant sur le flan de type tôle métallique (11) est disposée à chaque fois dans une cavité (16) située dans la matrice (12) du dispositif d'emboutissage (10).
  5. Dispositif d'emboutissage selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que
    la hauteur de l'au moins une barre d'emboutissage (15) agissant sur le flan de type tôle métallique (11) est ajustable.
  6. Dispositif d'emboutissage selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce que
    pour l'action correcte fonctionnellement de l'au moins une barre d'emboutissage (15) sur le flan de type tôle métallique (11), on prévoit un élément de résistance de force supplémentaire (17) agissant sur la barre d'emboutissage (15).
  7. Dispositif d'emboutissage selon la revendication 6,
    caractérisé en ce que
    l'élément de résistance de force supplémentaire (17) agissant sur la barre d'emboutissage (15) est réalisé de manière ajustable.
  8. Dispositif d'emboutissage selon la revendication 7,
    caractérisé en ce que
    l'élément de résistance de force supplémentaire (17) agissant sur la barre d'emboutissage (15) est formé par un élément de ressort, notamment un élément de ressort pneumatique.
  9. Dispositif d'emboutissage selon l'une quelconque des revendications 6 à 8,
    caractérisé en ce que
    pour le réglage supplémentaire de la barre d'emboutissage respective (15) du dispositif d'emboutissage (10), on prévoit une commande de force hydraulique active.
  10. Dispositif d'emboutissage selon l'une quelconque des revendications 1 à 9,
    caractérisé en ce que
    le moule d'emboutissage (14) est réalisé sous forme essentiellement plane.
  11. Dispositif d'emboutissage selon l'une quelconque des revendications 1 à 9,
    caractérisé en ce que
    le moule d'emboutissage (14) présente, à l'endroit de la barre d'emboutissage (15) agissant dans chaque cas, un renfoncement supplémentaire (18).
  12. Dispositif d'emboutissage selon la revendication 11,
    caractérisé en ce que
    l'au moins une barre d'emboutissage (15) présente, sur son côté orienté vers le renfoncement (18) du moule d'emboutissage (14), une configuration convexe et le renfoncement (18) lui-même présente une configuration concave de forme correspondante.
  13. Dispositif d'emboutissage selon la revendication 12,
    caractérisé en ce que
    l'au moins une barre d'emboutissage (15) présente, sur son côté orienté vers le renfoncement (18) du moule d'emboutissage (14), une configuration essentiellement rectangulaire et le renfoncement (18) lui-même présente également une configuration rectangulaire de forme correspondante.
  14. Dispositif d'emboutissage selon la revendication 12 ou 13,
    caractérisé en ce que
    le moule d'emboutissage possède des renfoncements (18) concaves, convexes et/ou essentiellement rectangulaires et l'au moins une barre d'emboutissage (15) présente une configuration de forme correspondante.
  15. Dispositif d'emboutissage selon l'une quelconque des revendications 1 à 14,
    caractérisé en ce que
    l'au moins une barre d'emboutissage (15) est fixée à chaque fois fermement dans la cavité (16) se trouvant sur la matrice (12) du dispositif d'emboutissage (10).
  16. Dispositif d'emboutissage selon la revendication 15,
    caractérisé en ce que
    des plaques intermédiaires insérées dans la cavité (16) sont réalisées pour l'ajustement de la hauteur de la barre d'emboutissage (15) fixée fermement dans la cavité (16) se trouvant sur la matrice (12).
  17. Dispositif d'emboutissage selon l'une quelconque des revendications 11 à 16,
    caractérisé en ce que
    dans le renfoncement supplémentaire (18) du moule d'emboutissage (14) est prévu un insert mobile (20) en vue d'un ajustement plus précis de la commande du flux de matière, sur lequel insert agit un élément de résistance de force (21).
  18. Dispositif d'emboutissage selon la revendication 17,
    caractérisé en ce que
    l'élément de résistance de force (21) agissant sur l'insert mobile (20) dans le renfoncement (18) du moule d'emboutissage (14) est réalisé de manière ajustable.
  19. Dispositif d'emboutissage selon la revendication 18,
    caractérisé en ce que
    l'élément de résistance de force (21) agissant sur l'insert mobile (20) est formé par des éléments de ressort, en particulier par des éléments de ressort pneumatiques.
  20. Dispositif d'emboutissage selon l'une quelconque des revendications 17 à 19,
    caractérisé en ce que
    pour l'ajustement supplémentaire de l'insert mobile (20), on prévoit une commande de force hydraulique active.
  21. Procédé pour l'emboutissage de flans (11) de type tôles métalliques, dans lequel le flan (11) à travailler est serré dans un dispositif d'emboutissage (10) par le biais d'un serre-flan (13) et d'une surface de contre-butée correspondante du moule d'emboutissage (14) et le flux de matière est essentiellement commandé par le biais de barres d'emboutissage (15) agissant sur ce flan (11),
    caractérisé en ce qu'
    au début de l'opération d'emboutissage, pour accroítre la capacité de mise en forme du flan (11), on applique sur le flan (11) une faible force inhibitrice, commandant le flux de matière, en ce qu'à un instant prédéterminé de l'opération d'emboutissage, la force inhibitrice, commandant le flux de matière, est nettement augmentée par engagement avec les barres d'emboutissage (15) sur le flan (11) et en ce qu'au cours de la partie finale de l'opération d'emboutissage, la force commandant le flux de matière est maintenue augmentée pour minimiser un retrait du flan (11),
    les barres d'emboutissage (15) ne venant pas en engagement avec le flan (11) au début de l'opération d'emboutissage.
  22. Procédé selon la revendication 21,
    caractérisé en ce qu'
    au bout de 80 à 97% de toute l'opération d'emboutissage, la force inhibitrice, commandant le flux de matière, est nettement augmentée par l'engagement des barres d'emboutissage (15) sur le flan (11).
  23. Procédé selon l'une quelconque des revendications 21 ou 22,
    caractérisé en ce qu'
    au cours de la partie finale de l'opération d'emboutissage, la force commandant le flux de matière s'applique sur le flan (11) dans une position prédéterminée, de telle sorte que le flux de matière soit considérablement réduit ou inhibé jusqu'à la fin de l'opération d'emboutissage.
  24. Procédé selon l'une quelconque des revendications 21 à 23,
    caractérisé en ce que
    le flux de matière est davantage inhibé au cours de la partie finale de l'opération d'emboutissage, en plus de l'application de la force commandant l'opération d'emboutissage.
EP20020020094 2002-09-07 2002-09-07 Dispositif et procédé d' emboutissage Expired - Fee Related EP1396297B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20020020094 EP1396297B1 (fr) 2002-09-07 2002-09-07 Dispositif et procédé d' emboutissage
DE50203897T DE50203897D1 (de) 2002-09-07 2002-09-07 Tiefziehvorrichtung und Verfahren zum Tiefziehen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20020020094 EP1396297B1 (fr) 2002-09-07 2002-09-07 Dispositif et procédé d' emboutissage

Publications (2)

Publication Number Publication Date
EP1396297A1 EP1396297A1 (fr) 2004-03-10
EP1396297B1 true EP1396297B1 (fr) 2005-08-10

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EP20020020094 Expired - Fee Related EP1396297B1 (fr) 2002-09-07 2002-09-07 Dispositif et procédé d' emboutissage

Country Status (2)

Country Link
EP (1) EP1396297B1 (fr)
DE (1) DE50203897D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104043713A (zh) * 2014-06-26 2014-09-17 梧州恒声电子科技有限公司 一种双动压力机拉伸模具工艺

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006003268B4 (de) * 2006-01-24 2008-02-07 Ford Global Technologies, LLC, Dearborn Verfahren sowie Tiefziehvorrichtung zum Tiefziehen von Metallblechen
HK1252600A2 (zh) * 2018-11-02 2019-05-31 Beta Pack International Ltd 金屬箔容器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH629981A5 (en) * 1978-06-08 1982-05-28 Aluminiumwerke Ag Rorschach Apparatus for the deep-drawing of a drawn part
JPS58157531A (ja) * 1982-03-16 1983-09-19 Nissan Motor Co Ltd プレス型
DE19504649C1 (de) * 1995-02-13 1996-08-22 Daimler Benz Ag Verfahren und Ziehwerkzeug zum Streckziehen von Blechen
US6276185B1 (en) * 1999-12-09 2001-08-21 General Motors Corporation Flow lock bead control apparatus and method for drawing high strength steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104043713A (zh) * 2014-06-26 2014-09-17 梧州恒声电子科技有限公司 一种双动压力机拉伸模具工艺

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EP1396297A1 (fr) 2004-03-10
DE50203897D1 (de) 2005-09-15

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