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公开(公告)号：US3913988A
公开(公告)日：1975-10-21
申请号：US52711074
申请日：1974-11-25
Applicant: HUGHES TOOL CO
Inventor： SCALES STANLEY R , PRINCE RICHARD B
CPC classification number: E21B10/24 , F16C33/14 , F16C2223/12 , F16C2352/00
Abstract: Disclosed herein are bearings and methods of treatment especially suitable for friction or plain bearings in earth boring drill bits. The surface of such a bearing is carburized and heat treated to produce extremely high surface carbon such that free carbides occur at the surface. The steel bearings disclosed have a surface carbon content after treatment higher than 0.9% (by weight) to achieve the free carbides. The method for producing the desired high surface carbon in the bearing involves the initial step of heating the bearing in a gas carburizing furnace containing an atmosphere with a high carbon potential. Then the bearing is quenched directly from a high carbon potential atmosphere. Alternatively the bearing may be carburized by the ''''pack'''' carburizing method and subsequently using a copper plating or equivalent during hardening to prevent loss of the high surface carbon. In either instance the high carbon surface performs better if treated with a sacrificial, solid lubricant of soft metal or a metallic compound that breaks in the surface during initial operation.
Abstract translation: 本文公开了特别适用于钻孔钻头中的摩擦或滑动轴承的轴承和处理方法。 这种轴承的表面被渗碳和热处理以产生极高的表面碳，使得在表面出现游离的碳化物。 所公开的钢轴承的处理后的表面碳含量高于0.9％（重量）以实现游离碳化物。 在轴承中生产所需高表面碳的方法包括在含有高碳电势的气氛的气体渗碳炉中加热轴承的初始步骤。 然后直接从高碳气氛中淬火轴承。 或者，可以通过“包装”渗碳方法渗碳轴承，随后在硬化期间使用镀铜或等效物以防止高表面碳的损失。 在任一情况下，如果在初始操作期间用牺牲的软质金属固体润滑剂或在表面破裂的金属化合物处理，则高碳表面的性能将更好。
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公开(公告)号：CA1061226A
公开(公告)日：1979-08-28
申请号：CA237062
申请日：1975-10-06
Applicant: HUGHES TOOL CO
Inventor： PRINCE RICHARD B
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.
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公开(公告)号：CA968339A
公开(公告)日：1975-05-27
申请号：CA162555
申请日：1973-01-31
Applicant: HUGHES TOOL CO
Inventor： SCALES STANLEY R , PRINCE RICHARD B
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