Method of making drills, endmills and other rotating-and-cutting

Details Method of making drills, endmills and other rotating-and-cutting Method of making drills, endmills and other rotating-and-cutting

1988-09-21

1989-12-19

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Drill

76DIG11, 419 5, 419 25, 419 41, B23P 1528, B22F 700

Patent

active

048874965

ABSTRACT:
Disclosed is a method of making drills, endmills and other rotating-and-cutting tools comprising the steps of: extruding super-hard metal powder into a spiral rod; sintering the spiral rod; forming a-ferrous metal powder layer around the rear end of the spiral rod sinter; and heating and then cooling the ferrous metal powder layer in such a way that voids may be caused to appear in the ferrous metal powder layer, which is integrally connected to the spiral rod sinter to make up its shank. Thanks to the existence of the voids in the shank layer, any inner strain will be dissipated, assuring that crack-free products result.

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