Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1986-02-21
1987-07-14
Leppink, James A.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175409, 175410, 76108A, E21B 1052
Patent
active
046796401
ABSTRACT:
In the method of manufacturing case hardened rock bits formed of a previously known conical profile for containing spaced apart cutter inserts in a common circumferential row about the cone, carburizing is applied uniformly over the entire conical surface of the cutter blank. Without removing any of the applied carburizing composition elsewhere, the compact lands are counterbored of diameter slightly larger than the socket cavity to be drilled, and to a depth below the carburized case so as to remove the carburized case thereat. The cutter blank is then hardened after which the insert cavities are drilled concentrically through the previous counterbores followed by a pressing of the individual inserts in an interference fit into the cavities. This results in continuous uninterrupted case hardening in the land areas between adjacent inserts. Also disclosed is a rock bit formed in accordance with the aforesaid method.
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Dresser Industries Inc.
Leppink James A.
Melius Terry Lee
Winans Fred A.
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