EP1362650B1 - Outil d' étirage-emboutissage - Google Patents

Outil d' étirage-emboutissage Download PDF

Info

Publication number
EP1362650B1
EP1362650B1 EP20030008130 EP03008130A EP1362650B1 EP 1362650 B1 EP1362650 B1 EP 1362650B1 EP 20030008130 EP20030008130 EP 20030008130 EP 03008130 A EP03008130 A EP 03008130A EP 1362650 B1 EP1362650 B1 EP 1362650B1
Authority
EP
European Patent Office
Prior art keywords
stretch
forming
tool
punch
tool according
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
EP20030008130
Other languages
German (de)
English (en)
Other versions
EP1362650A2 (fr
EP1362650A3 (fr
Inventor
Peter Broll
Thomas Patz
Frank Werner
Michael Reissig
Michael Bittner
Ralf Dietrich
Josef Reiser
Roland Oppenländer
Martin Grosz
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP1362650A2 publication Critical patent/EP1362650A2/fr
Publication of EP1362650A3 publication Critical patent/EP1362650A3/fr
Application granted granted Critical
Publication of EP1362650B1 publication Critical patent/EP1362650B1/fr
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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • 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
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • B21D25/02—Working sheet metal of limited length by stretching, e.g. for straightening by pulling over a die

Definitions

  • the invention relates to a stretch-forming tool according to the preamble of claim 1.
  • a stretch-forming tool is the WO-A-99/14001 refer to.
  • the object of the invention is to provide a stretch-forming tool of the type mentioned above, which ensures a precise stretch-forming deformation of a sheet metal blank on construction and control moderately simple manner.
  • a kinematically very simple and precise process tension and motion control of the sheet metal plate with respect to the forming die is achieved with the aid of pairs in oppositely inclined linear guides of the horrober- or -unterteils and forcibly coupled to the tool stroke, without this being a structural and complex control, external tool collet mechanism requires, with the further advantage that the stretch-forming tool according to the invention can be easily integrated into a conventional press line due to its compact design.
  • the stretching slide transversely to the tool lifting direction they are preferably connected to each other at the tool closing stroke at their clamping surfaces and with the edge of the board, that the clamping surfaces with the board in the direction of their surface extension form-locking Molded beads are provided.
  • the counter-force required in the retraction direction of the stretching slide is preferably generated by a hydraulic cushion accommodated in the slide interior with a throttle-dependent, freely switchable throttle point.
  • the forming die can be arranged schreibnverschieck the lower tool part and the Formstkovscheitel when inserting the metal sheet height equal to the clamping surfaces of the lower, extended stretching slide be raised, causing a bending of the sheet metal blank when inserted into the stretch-forming tool and thus an unachillieres pre-stretching the sheet metal plate is effectively prevented.
  • the forming die is lowered in advance before the stretchers, wherein the Absenkweg of the punch and because of the stroke dependent forcibly controlled lateral extension movement of the stretching slide consequently the Vorreckungsgrad the metal plate is variably adjustable.
  • the tool parts are provided with effective after the ironing process molding surfaces for forming a deep-drawing stage.
  • This makes it possible to produce stretch-drawn sheet metal parts with local thermoforming sections, such as stretch-drawn motor vehicle roofs with a Dachtoneinformung without tool change in a single operation.
  • the fixed clamping of the board edges between the clamping surfaces of the stretching slide and possibly also on the sheet holders of the reckschieberITA tool pages at the end of Streckziehhubs so far canceled that the board material can flow in the deep drawing phase of the board edges.
  • Edge-side deep drawing stages are preferably formed by a thermoforming mold in the tool top and an associated, adjacent to the forming die in the deep drawing stages counter-holder in the tool base, which acts at the same time for reasons of constructive simplification during the ironing process as a surface conforming to the forming die surface plate holder, for this purpose formed as a synchronous to the activation of the stretch slide compliant connected sheet holder ring is.
  • springback effects of the sheet-metal plate after releasing the stretching slide and a component incidence and / or the emergence of trailing edges in the deep-drawing phase can thereby effectively prevent that in the upper die an adjacent to the mold surface of the die additional hold-down is provided by the board in the thermoforming phase in the area adjacent the inlet radius surface areas is pressed against the forming die.
  • the stretch-forming tool shown in the figures is used to produce a two-dimensionally curved motor vehicle roof outer skin and contains as main components an installable in a conventional drawing press tool lower and upper part 1, 2, limited in the lower tool part 1 hubbeweglich mounted through the lower air cushion 3 in the upper Lifting position (Fig. 2) raised forming punch 4 with a convexly curved die surface 5 and two arranged on opposite longitudinal sides of the forming punch Reckschiebercrue 6, each consisting of a in the lower tool 1 and in the upper tool 2 in the manner described below linearly displaceable guided single squeegee 6A or 6B.
  • the forming punch 4 is enclosed by a sheet-metal holder ring 7 which is positioned in the lower die 1 on a controllable hydraulic block 8 and provided with a bead-shaped recess 9 (FIG. 1) on its narrow slide sides which are free of stretch tabs.
  • the sheet holder ring 7 in the bead area opposite is located on the upper tool 2 acted upon by the upper air cushion 10 hold-down 11, which has at its end face a bead 9 corresponding to the form of nose 12.
  • the tool is completed by a die 13 fastened to the upper part 2 for forming a circumferential deep-drawing step in the edge region of the roof outer skin and an additional hold-down 15 adjacent to the forming surface 14 of the female mold 13, which is pushed by the upper air cushion 10 into the extended position (FIGS. 2 and 3) is formed and in the outer edge region contour identical to the die surface 5.
  • the stretching slide 6 are slidably but rotatably mounted in linear guides 16 of the lower or upper tool 1, 2, which are inclined relative to the horrhubides at equal angles obliquely to the tool inside, their extension stroke is limited by preferably adjustable (not shown) stops , At their mutually facing clamping surfaces 17, the stretching slide 6 are provided with mutually corresponding mold beads 18 which interlock positively in the downstroke of the tool parts 1, 2 under locking beads in the intermediate sheet metal plate 19, so that the stretching slide 6 forcibly moved back in the linear guides 16 during further closing stroke of the upper tool 2 be extended simultaneously in the lateral direction perpendicular to the lifting movement of the upper tool 2, without the need for a complicated slide and drive wedge assembly.
  • the stretching slides 6 are each subjected to force-dependent movement by means of a hydraulic pad 20 which is accommodated in the slide interior and acts in the direction of the linear guide 16 in the direction of the linear guide 16.
  • the hydraulic pad 20 is connected via an e.g. solenoid-controlled switching valve 21 with a low-pressure accumulator 22, approximately in the form of a by a rubber membrane 23 in an air and a hydraulic chamber 24, 25 divided storage chamber connected.
  • a solenoid-controlled switching valve 21 with a low-pressure accumulator 22, approximately in the form of a by a rubber membrane 23 in an air and a hydraulic chamber 24, 25 divided storage chamber connected.
  • the stretching slide 6 are hydraulically blocked. If the valve 21 is reversed to the right in the unlocking position, the stretching slide 6 are subjected to a force in the extension direction under the pressure effect of the low-pressure accumulator 22.
  • the stretching slides 6 on the linear guides 16 are moved further back and thereby pushed apart, so that the sheet metal plate 19 clamped therebetween is pre-stretched until it again touches the forming die surface 5.
  • the Vorreckungsgrad lies in the range of 0.2-yield strength and can be variably adjusted by appropriate height positioning of the stops 27.
  • the hold-down 11 acted upon by the upper-air cushion 10 applies a draw bead to the hydraulically locked and contours-like adjoining the forming surface 5 of the lowered forming punch 4 and forms a draw bead in the bead area 9 at the sheet slide edges (FIG. 3).
  • the roof level is formed by the Matrizenform Chemistry 14 in the board 19, wherein the required counter-holding is taken from the sheet holder ring 7.
  • the circuit board 19 is pressed in the region of the deep-drawing inlet radius by the additional hold-15 to the forming die 4 and the board material can be controlled due to the reduced edge restraint and especially not jerky nachfnet from the bead area.
  • Fig. 5 shows the tool at the end of the deep drawing phase. When opening the tool, the individual tool components return to the starting position and the stretched and subsequently deep-drawn roof skin can be easily removed.
  • stretch-forming tool is used in conjunction with a conventional drawing press, it is entirely possible within the scope of the invention to use the press-side hydraulic system for pressure control of the stretching slide 6 and of the sheet-metal holder ring 7.

Landscapes

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

Claims (12)

  1. Outil d'étirage-emboutissage comprenant une partie inférieure (1) et une partie supérieure de l'outil (2) mobile linéairement par rapport à celle-ci, un poinçon de profilage (4) ainsi qu'un dispositif d'étirage qui s'abaisse par rapport au poinçon de profilage (4), pour serrer rigidement le bords d'une plaque de tôle (19) à former, et la charger en traction,
    caractérisé en ce que
    le dispositif d'étirage comprend respectivement par paire des coulisseaux d'étirage (6A, 6B) agissant conjointement par des surfaces de serrage (17) à leur extrémité s'étendant transversalement à la direction de course des parties d'outil (1, 2), ces coulisseaux sont disposés respectivement en étant limitées dans leur déplacement dans la partie inférieure et/ou supérieure de l'outil (1, 2) sur des guides linéaires (16) inclinés en biais aux mêmes angles par rapport à l'intérieur de l'outil, et peuvent être déplacés dans la direction d'introduction contre une force antagoniste définie entraînant le serrage de la plaque (19) entre les surfaces de serrage.
  2. Outil d'étirage-emboutissage selon la revendication 1,
    caractérisé en ce que
    les coulisseaux d'étirage (6A, 6B) ont sur leurs surfaces de serrage (17) des moulures d'emboutissage (18) saisissant par complémentarité de forme la plaque (19) dans la direction de son extension de surface.
  3. Outil d'étirage-emboutissage selon l'une quelconque des revendications 1 ou 2,
    caractérisé en ce que
    les coulisseaux d'étirage (6A, 6B) s'appuient sur la partie d'outil (1 ; 2) associée par un coussin hydraulique (20) avec un point d'étranglement (26) efficace dans la direction d'introduction du coulisseau, mais mis hors tension dans sa direction de sortie.
  4. Outil d'étirage-emboutissage selon la revendication 3,
    caractérisé en ce que
    le coussin hydraulique (20) est placé à l'intérieur du coulisseau.
  5. Outil d'étirage-emboutissage selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le poinçon de profilage (4) est placé sur la partie inférieure de l'outil (1) en pouvant se déplacer en hauteur, et le sommet du poinçon de profilage est soulevé à la même hauteur que les surfaces de serrage (17) des coulisseaux d'étirage (6A) inférieurs sortis lors de l'introduction de la plaque de tôle.
  6. Outil d'étirage-emboutissage selon la revendication 5,
    caractérisé en ce que
    le poinçon de profilage (4) peut être abaissé en tête devant les coulisseaux d'étirage (6A, 6B), et on peut régler de manière variable la trajectoire d'abaissement par une butée (27) située sur la partie inférieure de l'outil (1).
  7. Outil d'étirage-emboutissage selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'
    au moins un serre-flanc de tôle (7, 11) précontraint dans la direction de fermeture des parties de l'outil (1, 2) et empêchant la rétraction latérale de la plaque au cours de la phase d'étirage emboutissage est disposé sur au moins un côté de l'outil sans coulisseaux d'étirage.
  8. Outil d'étirage-emboutissage selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    les parties de l'outil (1, 2) sont dotées d'au moins une surface d'emboutissage (14) pour former un gradin d'emboutissage profond à la suite de la déformation d'étirage-emboutissage.
  9. Outil d'étirage-emboutissage selon la revendication 8,
    caractérisé en ce que
    pour ré-étirer la matière de la plaque côté bord au cours de la phase d'emboutissage profond, les coulisseaux d'étirage (6A, 6B) sont sollicités par une force antagoniste réduite à la fin de la déformation d'étirage-emboutissage jusqu'à la position de fermeture complète des parties de l'outil (1, 2).
  10. Outil d'étirage-emboutissage selon la revendication 8 ou 9,
    caractérisé en ce qu'
    un fond de matrice mobile élastique dans la direction de fermeture des parties de l'outil (1, 2) est associé au poinçon de profilage (4) dans la zone du gradin d'emboutissage profond.
  11. Outil d'étirage-emboutissage selon la revendication 10 associée à la revendication 7,
    caractérisé en ce que
    le serre-flanc de tôle (7, 11) comprend un anneau de serre-flanc de tôle (7) agissant en tant que fond de matrice mobile, raccordé jusqu'à la fin de la déformation par étirage-emboutissage exactement à la surface du poinçon de profilage (5) et commuté de manière souple et synchrone suite à la sollicitation de force réduite des coulisseaux d'étirage (6A, 6B)
  12. Outil d'étirage-emboutissage selon l'une quelconque des revendications 8 à 10,
    caractérisé par
    un serre-flanc supplémentaire (15) comprimant la plaque (19) dans la zone du rayon d'entrée de l'emboutissage profond au niveau du poinçon de profilage (4).
EP20030008130 2002-05-18 2003-04-08 Outil d' étirage-emboutissage Expired - Lifetime EP1362650B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10222314 2002-05-18
DE2002122314 DE10222314A1 (de) 2002-05-18 2002-05-18 Streckziehwerkzeug

Publications (3)

Publication Number Publication Date
EP1362650A2 EP1362650A2 (fr) 2003-11-19
EP1362650A3 EP1362650A3 (fr) 2005-10-05
EP1362650B1 true EP1362650B1 (fr) 2007-07-11

Family

ID=29265371

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030008130 Expired - Lifetime EP1362650B1 (fr) 2002-05-18 2003-04-08 Outil d' étirage-emboutissage

Country Status (3)

Country Link
EP (1) EP1362650B1 (fr)
DE (2) DE10222314A1 (fr)
ES (1) ES2287377T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2897001A3 (fr) * 2006-02-06 2007-08-10 Renault Sas 02ocede et outil d'emboutissage d'un flan metallique.
DE102009056315A1 (de) 2009-12-01 2011-06-09 GM Global Technology Operations LLC, ( n. d. Ges. d. Staates Delaware ), Detroit Streckziehvorrichtung und Verfahren zum Streckziehen eines Werkstücks sowie streckgezogenes Teil
DE102010048406A1 (de) * 2010-08-09 2012-02-09 Giw Gesellschaft Für Innovative Werkzeugsysteme Mbh Verfahren und Vorrichtung zum Ziehen von Blechen
IT1401375B1 (it) * 2010-08-09 2013-07-18 E M A R C S P A Dispositivo e procedimento per la piegatura con stiramento di pezzi metallici
DE102010049264A1 (de) * 2010-10-04 2012-04-05 Giw Gesellschaft Für Innovative Werkzeugsysteme Mbh Verfahren und Vorrichtung zum Ziehen von Blechen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1602551A1 (de) * 1967-05-13 1971-03-11 Siempelkamp Gmbh & Co Hydraulische Streckpresse
DE3206212C2 (de) * 1981-03-21 1986-04-30 SMS Hasenclever Maschinenfabrik GmbH, 4000 Düsseldorf Spannkopf eines Blechstreckers
FR2646623A1 (en) * 1989-05-03 1990-11-09 Peugeot Press tool for deep-drawing slightly shaped workpieces
ATE221423T1 (de) * 1997-09-18 2002-08-15 Cosma Int Inc Streck- und ziehwerkzeug und zugehöriges verfahren
US6041639A (en) * 1999-02-09 2000-03-28 The Boeing Company Method and apparatus for stretch-forming and shearing sheet metal

Also Published As

Publication number Publication date
ES2287377T3 (es) 2007-12-16
DE50307636D1 (de) 2007-08-23
EP1362650A2 (fr) 2003-11-19
DE10222314A1 (de) 2003-11-27
EP1362650A3 (fr) 2005-10-05

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