Method and device for manufacturing a drill blank or a mill...

Details Method and device for manufacturing a drill blank or a mill... Method and device for manufacturing a drill blank or a mill...

2007-11-20

2007-11-20

Rachuba, M. (Department: 3723)

Metal tools and implements, making

Blank or process

Drill

C076S108100, C029S527500, C029S530000

Reexamination Certificate

active

11121125

ABSTRACT:
The present invention relates to a method for manufacturing a drill blank or a mill blank by extrusion, said method comprising the forming of a first blank portion (B1) having external, axially extending external flutes and the forming of a further blank portion (B3) in the shape of a shaft. The invention also relates to a device for manufacturing a drill blank or a mill blank. The method according to the invention is characterised by: extruding a first blank portion (B1) having a free end and external flutes; allowing the extrusion to continue to supply further extruding mass into a cavity (6), said supply of extruding mass completely filling out the external flutes of the first blank portion (B1) to produce a second blank portion (B2) integral with the first blank portion (B1); allowing the extrusion to continue to produce a desired length of the first blank portion (B1); and cutting off the first blank portion (B1) at the end facing away from the second blank portion (B2).

REFERENCES:
patent: 2954121 (1960-09-01), Benson
patent: 3422648 (1969-01-01), Lemelson
patent: 4779440 (1988-10-01), Cleve et al.
patent: 5438858 (1995-08-01), Friedrichs
patent: 6450739 (2002-09-01), Puide et al.
patent: 00/74870 (2000-12-01), None

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