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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。
Plane grinding process in the workpiece speed determines the relative movement between the abrasive and workpiece speed distribution, and thus affect the abrasive and workpiece surface accuracy. Considering the actual arrangement of the diamond pellets on the abrasive and the actual distribution of the pressure in the contact zone, the friction moment of the mirror plate in the fixed abrasive plane grinding was simulated and analyzed by means of mechanics and kinematics. On this basis, according to the principle of moment balance in stable machining, the mathematical formula including speed is deduced, and the effect of workpiece radius and eccentric moment on the workpiece speed is discussed emphatically. The results show that the workpiece speed is not always equal to the speed of the abrasive, but gradually increases with the increase of the eccentric moment, fluctuating with the variation of the workpiece radius.