超声振动精密切削振幅对工件尺寸误差的影响

精密超声振动切削是将一定振幅的高频振动添加到刀具的运动过程中的一种加工方式,具有切削力小,加工精度高,加工表面质量好等特点。采用动力学分析方法利用二自由度的振动切削工件-刀具系统模型,并借鉴普通切削中对切削力的分析方法,首次从理论上实现了对振动切削中刀具振幅对工件变形影响的研究,并采用数值模拟的方法给出它的变化规律:在精密振动切削使用的振幅范围内,刀具振幅的变大会使工件的净位移减小、进而使工件的尺寸误差减小。同时,给出了不同刀具前角、切削速度和切削深度条件下,工件尺寸误差随振幅变化的规律。

Effect of Amplitude during Precision Ultrasonic Vibration Cutting upon Machining Dimension Error of Workpiece

Ultrasonically assisted turning is a promising machining technology, where high frequency vibration with amplitude is superimposed on the movement of the cutting tool. A two-dimension model of workpiece-tool in vibration cutting is presented in this paper. It is analyzed theoretically by dynamics. A study on the influence of amplitude upon machining dimension error of workpiece is conducted by the method of numerical simulation. And the relationship between the cutting parameters and dimension error is probed into under different cutting conditions.