Numerical optimization on groove structure parameters of bearing ball with variable-radius V-groove

LI Xiao-qi1, KE Ming-feng1, ZHU Jia-jun1, ZHOU Fen-fen2, LV Bing-hai1
（1.Faculty of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
2.Faculty of Mechanical Engineering, Taizhou University, Taizhou 318000, China）

Abstract: Aiming at the optimization issue of the groove geometric parameters for the variable-radius V-groove lapping method of the bearing ball, the influence of groove geometric parameters, including the eccentricity, the half angle, the raceway pole diameter and the grove space, on the uniformity of the distribution of spherical machining trajectory points was analyzed by numerical simulation. The influence weight of the four main parameters on the spherical machining trajectory uniformity was analyzed by orthogonal simulation experiments. The bearing ball lapping experiment was carried out. The experimental results indicate that the best geometric parameter combination is an eccentricity to ball diameter ratio of 4, a groove half angle of 45°, a groove raceway pole diameter to ball diameter ratio of 60, and a groove space coefficient of 2. After 4 hours of processing under the optimized groove parameter combinations, the sphericity error reduces from 0.057 μm to 0.022 μm, which is better than the processing results under other groove parameters. According to the simulation analysis, the optimized groove structure of lapping plate can obtain better spherical trajectory uniformity. The more uniform the spherical trajectory distribution is, the smaller the sphericity error can be after processing.
Key words: bearing ball; lapping; variable-radius V-groove; structure parameters optimization