Differentially carburized rock bit cutter

Details Differentially carburized rock bit cutter Differentially carburized rock bit cutter

1974-12-23

1976-03-30

Abbott, Frank L.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

148 165, E21B 935

Patent

active

039468178

ABSTRACT:
Disclosed herein is a cutter for a rock bit that has an interior bearing race area carburized by pack carburization methods to achieve a high carbon content for extreme hardness. The exterior of the cutter is carburized also, but to a lesser degree, to avoid brittleness in the tooth area. The differential carburizing is accomplished by gas carburizing the exterior while simultaneously pack carburizing the interior. Conventional heat treatment for hardening follows. This results in a cutter having a bearing area much harder than the exterior, giving a long bearing life and reducing tooth breakage.

REFERENCES:
patent: 2329751 (1943-09-01), Fermier
patent: 2444724 (1948-07-01), Brown
patent: 2927777 (1960-03-01), Steen
patent: 2927778 (1960-03-01), Coulter
patent: 2975083 (1961-03-01), Engelhard
patent: 3003370 (1961-10-01), Coulter
patent: 3275389 (1966-09-01), Neilson et al.
patent: 3398444 (1968-08-01), Nemy
patent: 3842921 (1974-10-01), Dill et al.

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