At the same time, the turn-around ring of the hammer head is made of special composite material, with the qualities of wear-resisting, self - lubricating, non-maintaining, easy changing etc.

同时锤头回转圈采用特殊复合材料，具有耐磨、自润滑、免维护、易更换等特点。

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We analyse the influence of the elastic deformation and the surface roughness for lubricating characteristics and give a thought of cutting groove in piston ring.

分析了弹性变形、表面粗糙度对润滑性能的影响，并提出了开槽环的设想。

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The use of O-ring NBR seals should be based on the property of lubricating greases in order to increase the reliability of products.

在实际使用中，应科学地选用与橡胶密封圈相宜的润滑脂，从而保证产品使用的可靠性。

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