EP0566431A1 - Dispositif d'emboutissage d'un flan de tôle - Google Patents

Dispositif d'emboutissage d'un flan de tôle Download PDF

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Publication number
EP0566431A1
EP0566431A1 EP93400491A EP93400491A EP0566431A1 EP 0566431 A1 EP0566431 A1 EP 0566431A1 EP 93400491 A EP93400491 A EP 93400491A EP 93400491 A EP93400491 A EP 93400491A EP 0566431 A1 EP0566431 A1 EP 0566431A1
Authority
EP
European Patent Office
Prior art keywords
blank
sheet
members
blank holder
sheet blank
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.)
Withdrawn
Application number
EP93400491A
Other languages
German (de)
English (en)
French (fr)
Inventor
Laurent Dreystadt
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 EP0566431A1 publication Critical patent/EP0566431A1/fr
Withdrawn legal-status Critical Current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
    • B21D22/20—Deep-drawing
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks
    • 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
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • 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
    • B21D24/04—Blank holders; Mounting means therefor

Definitions

  • the present invention relates to a device for stamping a sheet blank, in particular a thin or extra-thin sheet blank.
  • the blank holder surrounds the punch and has a flat surface intended to cooperate with the die to clamp the peripheral part of the sheet blank.
  • the punch acts on the sheet blank and draws it into an annular piece formed by the die.
  • the section of the die is complementary to that of the punch and the blank thus follows the shape of the punch during the stamping operation.
  • the blank holder is formed of a rigid piece which imposes the same force on the entire surface of the sheet blank between the blank holder and the matrix.
  • this conventional stamping device does not make it possible to control the sliding of the metal under the blank holder, which generates non-homogeneous deformations.
  • the resistance to sliding of the metal being controlled by the pressure of the blank holder, the latter therefore acts directly without deformation on the peripheral part of the sheet blank which varies in thickness during the drawing according to the deformation modes.
  • This thickening of the sheet blank results in a release of the contact between the blank holder and the sheet in the non-restricted areas, thereby causing folds or undulations of the metal in these non-restricted areas.
  • the present invention therefore aims to remedy these drawbacks by proposing a stamping device which makes it possible to better control the sliding of the metal under the blank holder and to reduce wrinkling and the drawing horns.
  • the present invention therefore relates to a device for stamping a sheet metal blank, of the type comprising a punch and two opposite members formed by a matrix and a peripheral monoblock blank holder, each member comprising a flat face intended to cooperate with the flat face of the other member for clamping the peripheral part of the sheet blank, characterized in that a first of the two members comprises an alternation of rigid zones and elastically deformable zones to obtain a homogeneous distribution of the retaining forces over the whole the surface of the peripheral part of the sheet blank.
  • FIG. 1 a device for stamping a sheet blank 1 comprising in a conventional manner, a stamping punch 2 and two opposite members, formed respectively by a matrix 3 and a peripheral blank holder 4.
  • the punch 2 is movable vertically under the action of a slide 7 and has a cross section of shape combined with that of the cavity 5 of the matrix 3.
  • the blank holder 4 moves vertically under the action of actuating means constituted for example by jacks not shown, connected to said blank holder by candles 8.
  • This blank holder 4 surrounds the punch 2 and its planar underside 9 is arranged opposite the planar face 6 of the die 3 to clamp the peripheral part. risk of the sheet blank 1 during the stamping operation.
  • the elastically deformable zones B are judiciously distributed as a function of the part which it is desired to stamp.
  • the peripheral portion 10a by the deformation, thickens and all the effort of retention by the blank holder is concentrated therein resulting in an imbalance of tension on the body of the box 10.
  • the stamping device according to the present invention solves this problem.
  • Each elastically deformable zone B is therefore placed opposite a shrunken part 10b of the box 10.
  • the distribution of the retaining forces is therefore homogeneous over the entire surface of the peripheral part 10a of the sheet blank 1 which avoids the formation of folds and drawing horns.
  • the stamping device according to the invention can also be used for forming boxes of circular section.
  • the elastically deformable zones B of the blank holder 4 are arranged in the direction where the sheet blank deforms. more difficult and where it is necessary to retain less metal.
  • This type of sheets therefore has, after cold rolling, an anisotropy coefficient R o determined in the rolling direction in which the sheet deforms more easily and an anisotropy coefficient Rg o determined in a direction perpendicular to the rolling direction in which the sheet is more difficult to deform.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP93400491A 1992-04-17 1993-02-25 Dispositif d'emboutissage d'un flan de tôle Withdrawn EP0566431A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9204807 1992-04-17
FR9204807A FR2690096A1 (fr) 1992-04-17 1992-04-17 Dispositif d'emboutissage d'un flan de tôle.

Publications (1)

Publication Number Publication Date
EP0566431A1 true EP0566431A1 (fr) 1993-10-20

Family

ID=9429025

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93400491A Withdrawn EP0566431A1 (fr) 1992-04-17 1993-02-25 Dispositif d'emboutissage d'un flan de tôle

Country Status (2)

Country Link
EP (1) EP0566431A1 (enrdf_load_stackoverflow)
FR (1) FR2690096A1 (enrdf_load_stackoverflow)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771851A (en) * 1954-05-20 1956-11-27 Lockheed Aircraft Corp Sheet metal forming die means
DE3151382A1 (de) * 1981-04-01 1982-10-21 Továrny strojírenské techniky koncern, 113 42 Praha "werkzeug fuer hydraomechanisches ziehen, insbesondere von ziehteilen ohne flansch"
US4745792A (en) * 1986-10-14 1988-05-24 Aluminum Company Of America Blankholder for a draw press

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771851A (en) * 1954-05-20 1956-11-27 Lockheed Aircraft Corp Sheet metal forming die means
DE3151382A1 (de) * 1981-04-01 1982-10-21 Továrny strojírenské techniky koncern, 113 42 Praha "werkzeug fuer hydraomechanisches ziehen, insbesondere von ziehteilen ohne flansch"
US4745792A (en) * 1986-10-14 1988-05-24 Aluminum Company Of America Blankholder for a draw press

Also Published As

Publication number Publication date
FR2690096A1 (fr) 1993-10-22
FR2690096B1 (enrdf_load_stackoverflow) 1994-07-13

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