轴向超声振动辅助磨削的磨削力研究

Grinding force of axial ultrasonic vibration assisted grinding

假设未变形磨屑厚度服从瑞利分布,推导了切削变形力的计算表达式;根据磨粒与工件的相对运动,探讨了超声振动对摩擦力的影响,分析了超声磨削时磨粒在砂轮切线方向上的摩擦力变化规律。综合切削变形力和摩擦力的理论分析,建立了轴向超声振动辅助磨削中磨削力的预测模型。对比实验的研究结果表明:由实验得到的磨削参数和振动参数对磨削力的影响规律与理论分析相一致,且仿真计算结果与实验测量结果的变化规律一致,从而验证了磨削力模型的可行性。

Assuming that the undeformed chip thickness obeys Rayleigh distribution,the machining deformation force calculating expressions were deduced. According to the relative mition of grains and workpiece,the influences of ultrasonic vibration on friction force were studied,and the variation law of friction force in grinding wheel tangential direction during axial ultrasonic vibration assisted grinding was analyzed. A prediction model of grinding force during axial ultrasonic vibration assisted grinding was established with the comprehensive theoretical analysis of machining deformation force and friction force. Comparative test results showed that the effects of grinding parameters and vibration parameters on grinding force obtained from tests are consistent with those using the theoretical analysis; the simulation results agree well with those of test measurements,so the feasibility of the model is verified.