Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1979-09-21
1981-12-01
Dean, R.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
148 39, 148 124, 175409, C21D 922
Patent
active
043031374
ABSTRACT:
A method is provided for manufacturing tungsten carbide insert-type cutter cones for a rock bit for drilling oil wells and the like. A cone blank is formed from medium to high carbon steel by forging and machining. The cone blank has a generally conical external surface, a generally cylindrical internal bearing cavity, and a circumferentially extending ball bearing race in the bearing cavity. The cone blank is heat treated by quenching and tempering to a desired core hardness. Insert holes are drilled in the external surface of the heat treated cone blank for insertion of tungsten carbide inserts. The surface of the ball race is selectively hardened by heating and quenching for forming a surface layer having a higher hardness than the core hardness. Selective hardening of the ball race is obtained by applying energy to the surface of the ball race by induction heating, an electron beam or a laser beam to austenitize a surface layer which is rapidly cooled for hardening.
REFERENCES:
patent: 3240639 (1966-03-01), Lihl
patent: 3650846 (1972-03-01), Holland et al.
patent: 4047984 (1977-09-01), Belke et al.
patent: 4108692 (1978-08-01), Quinlan
Dreger, Machine Design, Oct. 26, 1978, pp. 89-93.
Williams, Production, Nov. 1978, pp. 56-62.
Metals Handbook, 8th Ed., vol. 2, pp. 179-181, 1964.
Dean R.
Smith International Inc.
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