B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 24/14 (2006.01)
Patent
CA 2676966
The invention relates to method for deep drawing blanks (10) punched out of sheet metal that is painted or coated with film material, for example made of steel or aluminum, into flangeless molded blanks, wherein the blanks are formed to a crucible-shaped part, which has a flangeless cylindrical edge, around a drawing core (18) by means of a drawing bell (20) of a drawing die, and a predetermined spring force is applied to the side of the edge opposite of the drawing bell (20) during the forming of the edge of the blanks (10) by means of a blank holder (22), wherein the spring force applied to the blank holder (22) is spontaneously reduced substantially to zero shortly before the end of the drawing process.
L'invention concerne un procédé pour l'emboutissage de pièces brutes de coulée (10), qui sont estampées à partir de tôle laquée ou recouverte d'un matériau en feuilles, par exemple en acier ou en aluminium, pour donner des formages sans collerette, les pièces brutes de coulée étant déformées grâce à une tuyère d'étirage (20) d'un outil d'étirage autour d'un noyau d'étirage (18) pour donner une pièce en forme de pot ayant un bord cylindrique sans collerette et une force de ressort spécifiée étant appliquée pendant le formage du bord de la pièce brute de coulée (10) à l'aide d'un support de crissure (22) sur la face du bord opposée à la tuyère d'étirage (20), la force de ressort au niveau du support de crissure (22) étant spontanément réduite essentiellement à zéro peu avant la fin de l'action d'étirage.
Ridout & Maybee Llp
Saeta Gmbh & Co. Kg
LandOfFree
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