EP 0889763 B1 20020313 - VARIABLE-THICKNESS EXTRUSION METHOD AND EXTRUSION UNIT IN ACCORDANCE WITH SAID METHOD
Title (en)
VARIABLE-THICKNESS EXTRUSION METHOD AND EXTRUSION UNIT IN ACCORDANCE WITH SAID METHOD
Title (de)
VERFAHREN UND VORRICHTUNG ZUM FLIESSPRESSEN VON PRODUKTEN MIT VARIABLEM QUERSCHNITT
Title (fr)
PROCEDE D'EXTRUSION A EPAISSEUR VARIABLE ET UNITE D'EXTRUSION ASSOCIEE
Publication
Application
Priority
- EP 9701610 W 19970326
- IT MI960624 A 19960329
Abstract (en)
[origin: WO9736701A1] A cold impact extrusion method for hollow metal elements, in particular cartridge cases, comprises the steps of placing a slug or blank in a die, pressing the blank within the die between a punch and counter-punch facing each other, during compression moving the punch forward in the die at a first velocity and moving the counter-punch backward at a second velocity slower than the first one, so as to reduce the distance between the punch and counter-punch. During movement, the punch head is caused to pass through die areas having different distances from the punch sides so as to identify an extrusion annulus of variable width between the die and punch. An extrusion unit for applying the method comprises a punch (11, 111, 211) and a counter-punch (12, 112, 212) facing each other and coaxially movable within a die (13, 113, 213) to identify an extrusion chamber (14, 114, 214) therebetween, which has a variable transverse size along the punch and counter-punch movement axis.
IPC 1-7
IPC 8 full level
B21C 23/03 (2006.01); B21C 23/18 (2006.01); B21C 23/20 (2006.01); B21K 21/08 (2006.01)
CPC (source: EP)
B21C 23/03 (2013.01); B21C 23/18 (2013.01); B21C 23/20 (2013.01); B21C 25/04 (2013.01); B21K 21/08 (2013.01)
Designated contracting state (EPC)
DE ES FR GB IT SE
DOCDB simple family (publication)
WO 9736701 A1 19971009; AU 2293197 A 19971022; DE 69711030 D1 20020418; DE 69711030 T2 20020919; EP 0889763 A1 19990113; EP 0889763 B1 20020313; HU 222308 B1 20030628; HU P9903345 A2 20000228; HU P9903345 A3 20000428; IL 126170 A0 19990509; IL 126170 A 20010913; IT 1283320 B1 19980416; IT MI960624 A0 19960329; IT MI960624 A1 19970929; TR 199801945 T2 19990222
DOCDB simple family (application)
EP 9701610 W 19970326; AU 2293197 A 19970326; DE 69711030 T 19970326; EP 97915464 A 19970326; HU P9903345 A 19970326; IL 12617097 A 19970326; IT MI960624 A 19960329; TR 9801945 T 19970326