基于双平面轨迹均匀法的高精度圆柱滚子加工方法研究

Research on high precision cylindrical roller processing method based on double-plane even trajectory analysis

针对目前超精密圆柱滚子加工精度和一致性很难保证的问题,提出了利用行星式双平面研磨方式进行圆柱滚子的加工方法。同时对该方法的加工原理进行分析以及对保持架进行了模态仿真。在研究了圆柱滚子双平面加工运动轨迹基础上,发现靠近研磨盘中心以及研磨盘边缘的轨迹线分布比较集中,而靠近研磨盘中间环带部分的轨迹线分布较为均匀。据此设计并加工了实验装置,采用基于双平面轨迹均匀方法进行超精研磨和抛光。实验研究表明,工件的圆度误差达到了0.295μm,批直径变动量达到了1μm,表面粗糙度Ra达到了0.054μm,圆柱滚子的表面质量可以达到镜面级别,微观加工纹路具有多向性。公差等级达到了国家标准0级要求。

The accuracy and consistency of the ultra-precision cylindrical roller are hard to be guaranteed at the current stage. In this study,a method of machining the cylindrical roller by the planetary double-plane grinding is proposed. The machining principle is analyzed,and the modal of the cage is simulated. Based on the study of the double-plane machining trajectory of the cylindrical roller,it is found that the trajectories near the center of the grinding disc and the edge of the grinding disc are more concentrated while the trajectories near the middle of the grinding disc are more evenly distributed. The experimental device is designed and processed,the super fine grinding and polishing of cylindrical are carried based on double-plane even trajectory. Experimental results show that the circularity error of the workpiece can reach 0. 51μm,the variation of batch diameter reaches 1μm,and the surface roughness Ra reaches 0. 054μm. The surface quality of the cylindrical roller can reach the mirror level,and the micro pattern is multi-directional. The tolerance level meets the national standard level zero requirement.