Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1998-07-01
2000-09-12
Tsay, Frank
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175435, E21B 1000, E21B 1046
Patent
active
061163600
ABSTRACT:
A rotary drill bit is manufactured by a method including the step of forming at least a portion of the bit body from a precipitation hardening alloy, and brazing cutters to the bit body by a heating and cooling cycle during which the bit body is first heated to a temperature sufficient to melt the brazing material and is then cooled to room temperature, the heating and cooling brazing cycle being controlled in a manner so as also to effect precipitation hardening of the alloy from which the bit body is formed. In the case where the bit body is formed from solid infiltrated matrix material around a solid preformed mandrel, the heating and cooling cycle of the matrix forming process may also be controlled in a manner to effect precipitation hardening of the alloy from which the mandrel is formed.
REFERENCES:
patent: 4699227 (1987-10-01), Wardley
patent: 4781256 (1988-11-01), Wardley
patent: 5009519 (1991-04-01), Tatum
patent: 5429200 (1995-07-01), Blackman et al.
patent: 5570750 (1996-11-01), Williams
patent: 5644956 (1997-07-01), Blackman et al.
Camco International (UK) Limited
Daly Jeffery E.
Tsay Frank
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