EP 0092253 B1 19870812 - METAL SHEET FORMING PROCESS WITH HYDRAULIC COUNTERPRESSURE
Title (en)
METAL SHEET FORMING PROCESS WITH HYDRAULIC COUNTERPRESSURE
Publication
Application
Priority
- JP 4752683 A 19830322
- JP 6611882 A 19820420
Abstract (en)
[origin: EP0092253A2] A punch is pressed on a blankpiece into a die. The die is filled with liquid therein, whereby hydraulic counterpressure is generated by said pressing. The pressed blankpiece is forcibly followed in shape around the punch by hydraulic counterpressure, while part of the hydraulic counterpressure is automatically supplied to an outer circumference of the blankpiece via bypath passage. In case, the blankpiece is a plate, said supplied hydraulic pressure serves as compression force from the outer circumference of the flange to the radius direction. In case, the blankpiece is a product formed by a first drawing, said pressure serves as pressing force toward axial direction of a side wall of the product. When the supplied hydraulic pressure flows out from a space between the punch and a blank holder, the liquid serves as lubrication on an upper and lower surfaces of the blankpiece.
IPC 1-7
IPC 8 full level
B21D 22/20 (2006.01)
CPC (source: EP)
B21D 22/205 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0092253 A2 19831026; EP 0092253 A3 19850320; EP 0092253 B1 19870812; DE 3372937 D1 19870917; DE 92253 T1 19840301
DOCDB simple family (application)
EP 83103876 A 19830420; DE 3372937 T 19830420; DE 83103876 T 19830420