EP 0129010 B1 19871119 - METHOD OF AND DEVICE FOR EXTRUDING HOLLOW SECTIONS
Title (en)
METHOD OF AND DEVICE FOR EXTRUDING HOLLOW SECTIONS
Publication
Application
Priority
DE 3321957 A 19830618
Abstract (en)
[origin: EP0129010A2] 1. A process for extrusion of hollow profiles, which show graduated cross sections along the profile length, whereas an ingot (1) with the extrusion die (2) is brought into a recipient (3) and is pressed over a mobile mandrel (8) by means of a hollow punch (12) through the die (4), characterized in that at the beginning of the extrusion, the mandrel (8) enters the closed ended die (4) ; that during the compression of the cross section enlargement, the hollow punch (12) allows the material to be extruded to flow over the mandrel (8) until the closed ended die (4) is completely filled ; that the recipient (3) with the mandrel (8) and the die (4) rebounds towards the drum holder, whereas a profiled pressure ring (10) in the direction of extrusion is positioned behind the die (4) into extrusion position and the cross section of the hollow profile is extruded by moving the hollow punch (12) ; that after the compression of the cross section enlargement and after moving of the recipient (3) with the die (4), the closing plate (5) is moved across the extrusion direction and is exchanged against a pressure plate (7) with profiled opening and, that the die (4) is in one part.
IPC 1-7
IPC 8 full level
B21C 23/08 (2006.01); B21C 23/21 (2006.01); B21C 25/00 (2006.01)
CPC (source: EP)
B21C 23/085 (2013.01); B21C 23/217 (2013.01); B21C 25/00 (2013.01)
Designated contracting state (EPC)
AT BE CH FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0129010 A2 19841227; EP 0129010 A3 19850710; EP 0129010 B1 19871119; AT E30860 T1 19871215; DE 3321957 A1 19841220
DOCDB simple family (application)
EP 84103929 A 19840409; AT 84103929 T 19840409; DE 3321957 A 19830618