EP 0623402 B1 19970806 - Process for extrusion of metal and extrusion press
Title (en)
Process for extrusion of metal and extrusion press
Title (de)
Verfahren zum Strangpressen von Metall und Strangpresse
Title (fr)
Procédé de filage de métal et presse à filer perfectionnée
Publication
Application
Priority
FR 9305463 A 19930506
Abstract (en)
[origin: EP0623402A1] The subject of the invention is an extrusion process for extruding a metal billet (6) placed in a container (3) delimiting a housing (4) for the billet (6), the housing being closed at one end by a back piece (plate) (13) and at the other end by a dummy block (bearing plate) (5), in which process, before carrying out the extrusion, the billet (6) is precompressed in order to press the latter against the internal face (43) of the housing (4). In accordance with the invention, at the start of the precompression phase, a small clearance (e) is maintained between the closure back piece (13) and the corresponding end (31) of the container (3), preventing the container (3) from moving closer to the back piece (13) during the precompression in order to allow removal, via the clearance (e) thus maintained, of the air contained between the billet (6) and the internal face (43) of the housing (4), during the expansion of the billet (6) and the said clearance (e) is then left to close up by advancing the container (3) thus rendered integral with the billet (6). The invention applies more especially to direct extrusion, but may also be of interest in the case of reverse extrusion. <IMAGE>
IPC 1-7
IPC 8 full level
B21C 23/21 (2006.01); B21C 27/04 (2006.01)
CPC (source: EP US)
B21C 27/04 (2013.01 - EP US)
Designated contracting state (EPC)
DE ES GB IT
DOCDB simple family (publication)
EP 0623402 A1 19941109; EP 0623402 B1 19970806; DE 69404732 D1 19970911; DE 69404732 T2 19980122; ES 2105552 T3 19971016; FR 2704783 A1 19941110; FR 2704783 B1 19950728; JP H0775823 A 19950320; US 5613393 A 19970325
DOCDB simple family (application)
EP 94400976 A 19940504; DE 69404732 T 19940504; ES 94400976 T 19940504; FR 9305463 A 19930506; JP 9438194 A 19940506; US 23886994 A 19940506