EP 0590008 B1 19960207 - EXTRUSION DIE TOOL FOR PRODUCING A HARD METAL OR CERAMIC ROD WITH TWISTED INTERNAL BORES
Title (en)
EXTRUSION DIE TOOL FOR PRODUCING A HARD METAL OR CERAMIC ROD WITH TWISTED INTERNAL BORES
Title (de)
STRANGPRESSWERKZEUG ZUR HERSTELLUNG EINES HARTMETALL-ODER KERAMIKSTABES MIT GEDRALLTEN INNENBOHRUNGEN
Title (fr)
MATRICE A EXTRUSION UTILE POUR FABRIQUER DES BARRES EN METAL DUR OU EN CERAMIQUE A PASSAGES INTERIEURS HELICOIDAUX
Publication
Application
Priority
- DE 4120166 A 19910619
- EP 9201379 W 19920617
Abstract (en)
[origin: WO9222390A1] The invention relates to an extrusion die tool for producing a hard metal or ceramic rod with at least one twisted internal bore (14). The nose (3) of the nozzle (2) has a smooth cylindrical channel (4). A bearer (6) is fitted coaxially inside the nozzle (2) which has a plurality of elastic threads (9) and/or channels or bores corresponding to the desired number of internal bores for the thread-shaped pressing of a plastic material into the extruded material. The bearer (6) and the nozzle nose (3) are rotary, i.e. they rotate about their longitudinal axes. The pitch of the twisted internal bores (14) produced is thus determined by the rotation speed of the thread bearer (6) and/or the nozzle nose (3) and the rate of flow of the extruded material. Rod blanks with high-precision helical internal bores (14) can thus be produced.
IPC 1-7
IPC 8 full level
B21C 23/14 (2006.01); B21C 25/00 (2006.01); B22F 3/20 (2006.01); B23P 15/32 (2006.01)
CPC (source: EP US)
B21C 23/147 (2013.01 - EP US); B21C 25/00 (2013.01 - EP US); B22F 3/20 (2013.01 - EP US); B22F 2005/004 (2013.01 - EP US); B22F 2998/00 (2013.01 - EP US)
Citation (examination)
DE 3600681 A1 19870507 - KRUPP GMBH [DE]
Designated contracting state (EPC)
AT CH DE DK ES FR GB IT LI LU NL SE
DOCDB simple family (publication)
WO 9222390 A1 19921223; AT E133879 T1 19960215; DE 4120166 A1 19930107; DE 4120166 C2 19941006; DE 59205315 D1 19960321; EP 0590008 A1 19940406; EP 0590008 B1 19960207; ES 2082478 T3 19960316; JP 3312355 B2 20020805; JP H06508301 A 19940922; US 5438858 A 19950808
DOCDB simple family (application)
EP 9201379 W 19920617; AT 92913017 T 19920617; DE 4120166 A 19910619; DE 59205315 T 19920617; EP 92913017 A 19920617; ES 92913017 T 19920617; JP 50076193 A 19920617; US 16213794 A 19940502