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

B - Operations, Transporting

23

P

B23P 11/02 (2006.01) B23P 15/28 (2006.01) E21B 10/62 (2006.01) E21B 17/04 (2006.01)

Patent

CA 2072302

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 the shank tip, and having a size .15% less than that of the shank tip, cooling the shank in a cryogenic gas at ambient pressure to reduce its size, installing the head on the 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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