EP 0325947 B1 19920520 - PROGRESSIVE METHOD AND DIE FOR PUNCHED PARTS
Title (en)
PROGRESSIVE METHOD AND DIE FOR PUNCHED PARTS
Publication
Application
Priority
DE 3802247 A 19880127
Abstract (en)
[origin: EP0325947A2] A progressive method for the production of punched parts in a plurality of steps, such as shaping steps, catching step and punching out. In punching out, the punched part is cut out by a punch in conjunction with a die in accordance with the outline of the punched part. The technical problem is to provide a progressive method which supplies stamped parts with virtually negligible drawing in. In a stamping step before punching out, an impression is made to a depth which is a fraction of the thickness of the strip to be punched, with an outline somewhat larger than the outline of the punched part, and the drawn-in portion formed during the stamping step is caused to flow in the punching out step, with the result that a sheared edge with straight outlines is obtained. A progressive tool comprises a stamping punch with larger cross-sectional dimensions than the punched part. <IMAGE>
IPC 1-7
IPC 8 full level
B21D 37/08 (2006.01); B21D 53/16 (2006.01)
CPC (source: EP)
B21D 37/08 (2013.01); B21D 53/16 (2013.01)
Designated contracting state (EPC)
ES FR GB IT
DOCDB simple family (publication)
DE 3802247 C1 19890518; EP 0325947 A2 19890802; EP 0325947 A3 19900905; EP 0325947 B1 19920520; ES 2032056 T3 19930101
DOCDB simple family (application)
DE 3802247 A 19880127; EP 89100405 A 19890111; ES 89100405 T 19890111