Influence of lapping drive mode and rotational speed ratio on the track of abrasive particles
                                 YANG Jie, HONG Tao, WEN Dong hui, CHEN Zhen zhen, ZHANG Li hui, JI Meng tuo
                   (Key Laboratory of E＆M., Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China)

Abstract: Aiming at the problem that the abrasive grain trajectory was highly reproducible, and the lapping and polishing uniformity was insufficient in the conventional lapping process, the introduction of irrational speed ratio of this new concept, was expected to further enhance the lapping process uniformity. The mathematical model of the trajectory of the eccentric main drive and the linear swing drive was established, and the kinematics simulation was carried out by Matlab. The trajectory of single and multiple abrasive grains were compared between two driving modes and different speed ratios. Finally, the uniformity of lapping trajectory at different speed ratios was analyzed by discrete coefficient.The results indicate that when the speed ratio is rational, the lapping trajectory are repeated, speed ratio size and drive mode have a great influence on the trajectory uniformity; when the speed ratio is irrational, the lapping trajectory are open, its trajectory uniformity is better than the rational number, and the speed ratio and driving mode have little effect on the trajectory uniformity. The research provides a theoretical basis for selecting reasonable driving mode and speed ratio, and is beneficial to improve the quality of machined surface.

Key words: lapping trajectory; drive mode; irrational rotational speed ratio; trajectory uniformity