轴向超声振动辅助磨削的磨削力建模

以单颗磨粒为对象,分析轴向超声振动下磨粒的运动特性。在此基础上,将磨削力分为切屑变形力和摩擦力两部分,分别分析了轴向超声振动对切屑变形力和摩擦力的影响。在切屑变形力方面,轴向超声振动改变了磨粒运动方向与主切削方向间的夹角;在摩擦力方面,轴向超声振动降低了磨粒与工件间的摩擦因数。基于此建立了轴向超声振动辅助磨削的磨削力模型。通过对21Ni Cr Mo5H进行了轴向超声振动辅助磨削的磨削力试验,确定了模型中的常数,并验证了所建模型的正确性。建立的磨削力模型是轴向超声振动辅助磨削的磨削力预测的一种有效方法,对轴向超声振动辅助磨削机理的认识具有较大意义。

Modeling on Grinding Force Assisted with Axial Ultrasonic Vibration

Taking single grain as the object,the movement characteristics of abrasive particles in the axial ultrasonic vibration are analyzed. On this basis, The grinding force is divided into two parts—the chip deformation force and friction force,and the effect of ultrasonic vibration on the chip deformation force and friction force is analyzed. In the chip deformation force aspect, the axial ultrasonic vibration changes the angle between the moving direction of the abrasive grain and the main cutting direction. In the friction force aspect, the axial ultrasonic vibration reduces the friction coefficient between the abrasive and the workpiece. Based on this, modeling on grinding force assisted with axial ultrasonic vibration is built. The ultrasonic vibration assisted grinding force experiment on 21NiCrMo5H is performed,constants of the model are determined, and the correctness of the theoretical model of grinding force is verified. Grinding force model built is an effective method of grinding force prediction on grinding assisted with axial ultrasonic vibration, and the understanding of the mechanism of axial ultrasonic vibration assisted grinding is of great significance.