平面研磨加工中工件转速的理论分析

平面研磨加工中工件转速决定了磨具与工件间的相对运动速度分布,并进而影响磨具和工件的面形精度。在考虑了磨具上金刚石丸片的实际排列以及接触区压强的实际分布的前提下,运用力学和运动学的方法,模拟分析了在固着磨料平面研磨加工中镜盘所受的摩擦力矩。在此基础上,根据稳定加工时力矩平衡原理得出了包含转速的数学公式,并重点探讨了工件半径和偏心矩对工件转速的影响。结果表明,工件转速并不总是等于磨具转速,而是随着偏心矩的增大而逐渐增高,随着工件半径的变化发生起伏波动。

Theoretical analysis of the rotate speed of workpiece in the plane lapping process

In the processes of plane lapping, the rotate speed of the workpiece determines the speed distribution of relative motion between workpiece and lapping tool, and it strongly influences the form of the workpiece and the lapping tool. The friction moments acting on the lens plate in plane lapping process are investigated according to the actual arrangement of the diamond pellets and the actual distribution of pressure in the contact area through mechanical and kinematics simulation analysis. A formula involved the rotate speed of workpiece is derived from the moment analysis. The influence of the radius of workpiece and eccentricity on the rotate speed of the workpiece is discussed. The results show that the rotate speed of workpiece is not always equal to the rotate speed of lapping tool, and it will increase with the increase of the eccentricity, and change with the radius of workpiece.