1950-60s China mainly imitated the soviet-era steel ball processing and processing equipment；70s finished the process of replacing file and soft mill with polishing process. In the same period, 3M4630 horizontal steel ball milling machine and 3M4930 horizontal steel ball ball machine were developed. 80s we finished process of circulating water superfinishing process technology. It has developed 3M4730 vertical Steel ball lapping machine and 3ML4780 vertical steel ball grinding machine. The steel ball manufacturing level and quality of our country have been greatly improved. It meets the assembly requirement of low noise bearing. But there is still a big gap with the quality of steel ball abroad.

1990s the steel industry took aim at international steel ball advanced level. From the various aspects of steel ball processing technology that study it careful. The new process of grinding wheel research for steel ball resin is introduced. Xinxiang sunrise NC equipment Limited. Thire research the 3M77 series machine tool is suitable for grinding mill of resin grinding wheel. The quality stability of steel ball is greatly improved. The surface quality was improvement apparently. The single vibration of steel ball is further reduced. The bearing Appropriate supporting rate is obviously improved. Especially in the elimination of bearing abnormal sound effects are significant. G5 steel ball in stable and mass produce is realized. Make the precision of steel ball to international advanced level.

With the development of steel ball processing equipment. At present, the basic processing process of domestic steel ball is：raw materials inspection > cold heading（Hot heading， hot roll， cropping ，punch > buffing > soft polishing > heat treatment > hard grind > surface strengthening > primary grinding > fine filling grinding > eddy current inspection & appearance inspection > Superfine grinding > optical appearance > Anti-rust cleaner > finished product inspection > product packaging.

Anti-rust cleaner, drying, pick up defective products and quality control checking are required for each process. Process quality control index is more strict (For example, the ball error control of hard grinding has basically reached the control index of the original research). The control of process tooling and process details is more perfect. Technology equipment and process details control is more perfect. 100% eddy current testing and photoelectric appearance for special steel balls such as automobile bearings are carried out. G5，G10 ball can be manufactured steadily. Meet the different bearing assembly requirements.

（作者：张永乾1，吴朝阳2
1. 中国轴承工业协会技术委员会 滚动体专业委员会，河南 洛阳 471039
2. 常州光洋轴承有限公司，江苏 常州 213002）
（未完待续）