讨论了套筒表面的喷砂处理，选择不同的磨料、时间及压力可得到套筒不同的表面形状及粗糙度。

The sleeve surface processing is discussed, choosing different abrasive, time and pressure will result in different surface shape and rough parameter.

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通过道路试验研究，分析了汽车正时套筒链的磨损机制及销轴和套筒的磨损表面形貌。

By the experiment research on road running test of timing bushing chains for automotive engine, its wear mechanism and the worn surface of pins and bushings were analyzed.

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由于套筒材料相对为软性，套筒材料被压入攻丝工件的粗糙表面。

Thanks to the soft sleeve material, anchorage is achieved by the flow of sleeve material into the surface roughness of the drilled hole.

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