EP 0074421 B1 19850522 - DEEP-DRAWING ARRANGEMENT FOR PRESSES WITH MECHANICALLY DRIVEN DRAWING PUNCH
Title (en)
DEEP-DRAWING ARRANGEMENT FOR PRESSES WITH MECHANICALLY DRIVEN DRAWING PUNCH
Publication
Application
Priority
EP 81107203 A 19810912
Abstract (en)
[origin: EP0074421A1] 1. Drawing mechanism for presses having a mechanically driven drawing ram (24) and a blank holder (5) whose holding force acting on the blank (27) oppositely to the drawing direction is exerted via a pressure plate (7) with the aid of a drawing cushion piston (10) which supports said pressure plate and is loaded by pressure medium and which is disposed in a stationary drawing cushion cylinder (12), characterized in that a piston (9) having an operative surface adapted to be loaded in the drawing direction is fastened on the pressure plate (7), and that a control means (22, 23) is provided which works in dependence on the travel of the ram and by which the blank holder (5), before the drawing ram (24) contacts it, is adapted to be accelerated into a movement in the drawing direction through the loading of the operative surface with pressure medium.
IPC 1-7
IPC 8 full level
B21D 22/22 (2006.01); B21D 24/08 (2006.01); B21D 24/14 (2006.01)
CPC (source: EP US)
B21D 24/08 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0074421 A1 19830323; EP 0074421 B1 19850522; BR 8207859 A 19830830; DE 3170614 D1 19850627; JP H0422649 B2 19920420; JP S58501419 A 19830825; US 4499750 A 19850219; WO 8300821 A1 19830317
DOCDB simple family (application)
EP 81107203 A 19810912; BR 8207859 A 19820907; DE 3170614 T 19810912; DE 8200181 W 19820907; JP 50279782 A 19820907; US 52590683 A 19830509