EP 0590262 B1 19960417 - Explosion assisted hydromechanical deep drawing
Title (en)
Explosion assisted hydromechanical deep drawing
Title (de)
Explosionsunterstütztes hydromechanisches Tiefziehen
Title (fr)
Emboutissage profond hydromécanique assisté par explosion
Publication
Application
Priority
DE 4232913 A 19921001
Abstract (en)
[origin: EP0590262A1] The invention relates to a method for the hydromechanical deep drawing of sheet metal (8) into a shape predetermined by a punch (7) by means of a press (1) which contains the punch and a die chamber (9) that can be supplied with pressurised fluid and is open towards the punch, one of the two parts being drivable in a reciprocating manner. The sheet is clamped fluid-tightly and with a sustained force at its outer rim, between a contact surface (5) at the front end of the punch and a correspondingly shaped counter-contact surface (5) at the front end of the die chamber. The die chamber is very largely filled with a fluid under rising pressure, the yielding sheet being drawn by the fluid pressure, the rim of the sheet sliding out of the rim clamping (5) as it is drawn, and being pressed exactly into the shape of the punch. In order to shorten the pressure build-up to the required final pressure and to relieve the press of the very high forces, a metered explosive charge, preferably in the form of a combustible gas (14) mixed with oxygen (15) is introduced into the die chamber and ignited at a defined instant shortly before the lower point of reversal is reached, i.e. before the completion of the drawing operation. The forces caused by the explosion of the explosive charge, which act for a brief time on the punch (7) and on the die chamber (9) in the direction (24) of motion of the die chamber, are isolated from the press structure (2) by means of an appropriate distribution of the mass of these parts. <IMAGE>
IPC 1-7
IPC 8 full level
B21D 22/20 (2006.01); B21D 26/08 (2006.01)
CPC (source: EP)
B21D 22/205 (2013.01)
Designated contracting state (EPC)
DE ES FR IT
DOCDB simple family (publication)
EP 0590262 A1 19940406; EP 0590262 B1 19960417; DE 4232913 A1 19940407; DE 4232913 C2 19950427; DE 59302247 D1 19960523; ES 2087621 T3 19960716
DOCDB simple family (application)
EP 93111956 A 19930727; DE 4232913 A 19921001; DE 59302247 T 19930727; ES 93111956 T 19930727