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滾球是球軸承的零件。普通多由鉻鋼製成,並需經过热处理。热处理後的硬度高達Rc62～66。滾球所承受的压力極高。為使軸承正確工作,滾球的表面的制造与加工必須準確而精密,精度的要求很高。同一軸承的滾球,其机械性能必須相同,彼此直径的允许偏差極小。根據3722—53球軸承滾球技術條件的規定,滾球精度分為七級。此种滾球係供装配軸承之用或作自由零件供应。七級精度滾球的允許偏差,包括橢球度及稜面度、尺寸差别
Ball is the ball bearing parts. Mostly made of chrome steel, and subject to heat treatment. Hardness after heat treatment up to Rc62 ~ 66. The pressure on the ball is extremely high. In order to make the bearing work correctly, the manufacture and processing of the surface of the ball must be accurate and precise, and the requirements of the precision are very high. The same bearing ball, its mechanical properties must be the same, the minimum allowable deviation from each other’s diameter. According to the provisions of 3722-53 ball bearing ball technical conditions, ball accuracy is divided into seven. Such ball system for the assembly of bearings or for free parts supply. Seven grade precision ball tolerance, including ellipsoid and prism face degree, size difference