Rock drill bit and method of making same

Details Rock drill bit and method of making same Rock drill bit and method of making same

1991-06-28

1992-09-29

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Drill

175413, 175417, 29447, B21K 502

Patent

active

051506360

ABSTRACT:
A rock drill bit having a shank and a replaceable cutting head, comprising steps of producing a shank having a tip with an outer surface having a given shape, producing a head having a working face at one end and a recess at the other end with a cross-section corresponding in shape to that of said shank tip, and having a size about 0.15% less than that of said shank tip, cooling said shank in a cryogenic gas at ambient pressure to reduce its size, installing said head on said shank tip, and permitting the components to return to ambient temperature, to establish a shrink fit between the head and the shank.

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