EP 1554067 A1 20050720 - METHOD AND APPARATUS FOR REDUCING WRINKLE FORMATION IN DEEP DRAWING
Title (en)
METHOD AND APPARATUS FOR REDUCING WRINKLE FORMATION IN DEEP DRAWING
Title (de)
VERFAHREN UND VORRICHTUNG ZUM REDUZIEREN VON FALTENBILDUNG BEIM TIEFZIEHEN
Title (fr)
PROCEDE ET APPAREIL POUR REDUIRE LA FORMATION DE PLIS DANS UNE OPERATION D'EMBOUTISSAGE PROFOND
Publication
Application
Priority
- NL 0300720 W 20031023
- NL 1021738 A 20021024
Abstract (en)
[origin: WO2004037460A1] A method and apparatus for deep drawing a product from a blank(5), in which, during deep drawing, the blank(5) is held near its edge by a downholder (8) against a die ring cooperating with the downholder (8), thereby preventing, at least reducing wrinkle formation in the blank, by adjusting, at the beginning of deep drawing, the downholder (8) such that a downholder (8) force exerted by the downholder (8) on the edge of the blank is relatively small, and by controlling, during the further course of the process, the downholder (8) on the basis of a predetermined thickness trend of the mentioned edge during deep drawing and/or a trend or critical value derived from this thickness trend.
IPC 1-7
IPC 8 full level
B21D 22/21 (2006.01); B21D 24/14 (2006.01)
CPC (source: EP US)
B21D 22/21 (2013.01 - EP US); B21D 24/14 (2013.01 - EP US)
Citation (search report)
See references of WO 2004037460A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2004037460 A1 20040506; AT E408465 T1 20081015; AU 2003275734 A1 20040513; DE 60323658 D1 20081030; EP 1554067 A1 20050720; EP 1554067 B1 20080917; NL 1021738 C2 20040427; US 2005268685 A1 20051208
DOCDB simple family (application)
NL 0300720 W 20031023; AT 03759078 T 20031023; AU 2003275734 A 20031023; DE 60323658 T 20031023; EP 03759078 A 20031023; NL 1021738 A 20021024; US 53236005 A 20050420