EP 0288780 B1 19911127 - EXTRUSION TOOL FOR MAKING A DRILL BLANK WITH AT LEAST ONE INTERNAL HELICAL FLUSH BORE
Title (en)
EXTRUSION TOOL FOR MAKING A DRILL BLANK WITH AT LEAST ONE INTERNAL HELICAL FLUSH BORE
Publication
Application
Priority
DE 3714479 A 19870430
Abstract (en)
[origin: US4831859A] An extrusion tool for making a drill bit blank provided with an internal rinsing bore extending helically in a longitudinal direction of the drill bit blank, includes a nozzle having an inner wall defining a throughgoing axial bore through which a malleable material is passed in a direction of extrusion parallel to the tool axis. The axial bore forms an inlet portion and a mold chamber adjoining the inlet portion downstream thereof as viewed in the direction of extrusion. There is further provided a mandrel situated in the inlet portion; a resiliently deformable wire supported by the mandrel and projecting into the mold chamber; and a helical device provided on the inner wall in the mold chamber for twisting the malleable material as it passes through the mold chamber. There is further provided a clamping device having a tightened state for immobilizing the nozzle and the mandrel with respect to one another during extrusion operation. In the loosened state of the clamping device a positional adjustment of the nozzle with respect to the mandrel may be made.
IPC 1-7
IPC 8 full level
B21C 23/10 (2006.01); B21C 23/14 (2006.01); B21C 25/00 (2006.01); B21C 25/02 (2006.01); B21C 25/04 (2006.01); E21B 10/60 (2006.01); E21B 10/61 (2006.01)
CPC (source: EP US)
B21C 23/10 (2013.01 - EP US); B21C 23/147 (2013.01 - EP US); B21C 25/00 (2013.01 - EP US); E21B 10/61 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0288780 A2 19881102; EP 0288780 A3 19900613; EP 0288780 B1 19911127; AT E69744 T1 19911215; DE 3714479 A1 19881117; DE 3714479 C2 19890615; DE 8717444 U1 19890112; JP H0450085 B2 19920813; JP S63278612 A 19881116; US 4831859 A 19890523
DOCDB simple family (application)
EP 88105349 A 19880402; AT 88105349 T 19880402; DE 3714479 A 19870430; DE 8717444 U 19870430; JP 10151888 A 19880426; US 18907788 A 19880502