Differentially carburized rock bit cutter

Details Differentially carburized rock bit cutter Differentially carburized rock bit cutter

E - Fixed Constructions

21

B

148/39, 255/74

E21B 10/00 (2006.01) C21D 9/22 (2006.01) C23C 8/04 (2006.01) E21B 10/22 (2006.01) E21B 10/50 (2006.01)

Patent

CA 1061226

Abstract of the Disclosure Disclosed herein is a cutter for a rock bit that has an interior bearing race area carburized by pack car- burization 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 bear- ing area much harder than the exterior, giving a long bear- ing life and reducing tooth breakage. -2-

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