高速牙轮钻头轴承的失效分析。

The failure analysis of the high speed roller bit bearing.

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收集了近几年20只现场失效牙轮钻头，对其轴承表面金相组织和硬度以及影响牙轮钻头滑动轴承失效的主要因素进行了分析。

With 20 rock bits which used in the field, bearings' surface metallography, rigidity, and the main factors influence the life of the rock bit journal bearings were studied.

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分析了牙轮钻头滑动轴承失效的机理，论证了牙轮钻头滑动轴承失效形式主要为粘着磨损，分析了影响轴承粘着磨损失效的主要因素。

The failure mechanism of journal bearing of roller cone bit is analyzed, the failure type is adhesive wear, and main factors affecting the adhesive wear are analyzed.

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