Establish the erosive wear mechanism of drilling string in air drilling and put forward that erosion wear is a substantial cause to promote drill string failure.

初步确立了空气钻井钻柱冲蚀磨损机理，提出钻屑冲蚀是促使钻具失效的一项重要原因。

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It is pointed out that, in the case of having radial flexible mechanism, the wear between anti rotation mechanism and scroll wrap exhibits synchronism and self compensation.

指出在具有径向柔性机构的情况下，该防自转机构和涡旋盘齿的磨损具有同步性和自动补偿性。

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In the low wearing area of the loose abrasive of tiny particle, wear mechanism is mainly the micro-cuts wearing mechanism, and the surface has obvious furrow and indentation.

在小颗粒松散磨料的低磨损区，磨损机理主要是微观切削磨损机理，表面有明显的犁沟或者印痕。

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