Hardening of selected areas of an earth boring rockbit

Details Hardening of selected areas of an earth boring rockbit Hardening of selected areas of an earth boring rockbit

1986-06-09

1987-04-28

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Drill

76DIG2, 148 19, 384 95, 175374, B21K 502, E21B 1050, C21D 168

Patent

active

046604448

ABSTRACT:
Bearing surfaces or other selected areas of component parts of a rotary cone earth boring rockbit are carburized or otherwise surface enriched by the sequential steps of coating the selected surface area to be enriched with a non-water based composition capable of effecting a corrosive protective seal thereabout; covering the coated area with a predetermined applied thickness of a carbonaceous paste; drying the paste and thereafter, subjecting the component part to an elevated temperature below which the coating is pyrolyzed to fully austenize the part and achieve a desired case depth followed by quenching, tempering, and finished machining as required.

REFERENCES:
patent: 2367978 (1945-01-01), Troy
patent: 3661820 (1972-05-01), Foreman et al.
patent: 3842921 (1974-10-01), Dili et al.
patent: 3885838 (1975-05-01), Childers et al.
patent: 3984158 (1976-10-01), Sorensen et al.
patent: 4021084 (1977-05-01), Garner

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