Pack carburizing process for earth boring drill bits

Details Pack carburizing process for earth boring drill bits Pack carburizing process for earth boring drill bits

C - Chemistry, Metallurgy

21

D

148/46

C21D 9/22 (2006.01) C21D 1/70 (2006.01) C21D 1/74 (2006.01) C23C 8/66 (2006.01)

Patent

CA 1263933

ABSTRACT Shown is a method of manufacturing an earth boring bit of the type having a bearing pin which extends from a head section of the drill bit for rotatably mounting a cutter. A container is provided having opposing end openings with sidewalls therebetween which define a con- tainer interior. The container is placed over a portion of the head section so that the pin extends within the interior of the container. A spring spacer is then installed within the interior of the container about at least a portion of the circumference of the bearing pin at at least one axial location. The container is then packed with a particulate treating medium, the container is covered, and the pin and container are placed into a furnace for a time and at a temperature sufficient to activate the treating medium.

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