Method of making a rotary drill bit

Details Method of making a rotary drill bit Method of making a rotary drill bit

1985-04-26

1986-12-09

Brody, Christopher W.

Metal treatment

Compositions

Heat treating

148152, 148154, 76107R, 291484A, C21D 109

Patent

active

046278826

ABSTRACT:
A rotary drill bit comprising a roller cutter (13) rotatably carried over a bearing system, which comprises a friction bearing (14). For purposes of ensuring sufficient hardness of the cooperating friction surfaces and lubrication thereof and optimizing cutting ability and fatigue resistance the bearing surface (28) of the roller cutter (13) is surface-hardened by means of a thermal hardening method and provided with a solid lubricant (27), and the bearing surface (29) of the bearing pin (12) is provided with a wear resistant deposit having higher wearability than the surface-hardened bearing surface.

REFERENCES:
patent: 3235316 (1966-02-01), Whanger
patent: 3275389 (1966-09-01), Neilson et al.
patent: 3476446 (1969-11-01), Neilson
patent: 3477884 (1969-11-01), Schlicht
patent: 3866987 (1975-02-01), Garner
patent: 3995917 (1976-12-01), Quinlan
patent: 4021084 (1977-03-01), Garner
patent: 4043847 (1977-08-01), Just
patent: 4109974 (1978-08-01), Svarnstrom

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