我厂从1964年开始采用无锡机床厂M4206、M4204超精套圈沟道。1965年开始自制超精研机。文化大革命以来,全面推广超精研工艺,现有十台沟道超精研机投入生产运转,代替了95％以上的沟道抛光工艺。除少数和特殊轴承还采用砂带抛光外,其余均已淘汰抛光工艺。 I plant from 1964 Wuxi Machine Tool Plant M4206, M4204 super-precision ring loop. 1965 made super-lapping machine. Since the Cultural Revolution, the super-lapping process has been fully promoted. Ten super-lapping machines have now been put into production and running, replacing more than 95% of the trench polishing process. In addition to a few and special bearings also use abrasive belt polishing, the rest have been eliminated polishing process.