旋转超声加工振幅与实际切削深度特性研究

旋转超声加工中金刚石砂轮超声振幅大小、实际切削深度的正确判定以及工艺参数对金刚石砂轮超声振动幅度影响规律的研究对旋转超声高效精密加工有着重要意义。结合旋转超声加工(RUM)时磨粒的运动及切削特性,分析了磨粒的实际切削深度特性,开展了实际切削深度与超声振幅关系的试验研究;通过改变主轴转速、进给速度、切削深度等工艺参数,讨论了工艺参数对加工时金刚石砂轮超声振幅特性的影响。研究表明:旋转超声面铣削加工时,超声振幅与轴向进给的有效叠加决定实际切削深度;金刚石砂轮的超声振幅具有一定的稳定性,可以有效确保旋转超声加工工件的尺寸精度。

Research on the Properties of Ultrasonic Vibration Amplitude and Actual Cutting Depth in Rotary Ultrasonic Machining

The determinations of actual cutting depth and ultrasonic vibration amplitude, and the influences of input variables on ultrasonic vibration amplitude have important significance on the high efficiency and precision processing of rotary ultrasonic machining (RUM). The features of actual cutting depth during RUM are presented by analyzing the kinematics and cutting characteristics of diamond tool. Experiments are conducted to explore the relations of actual cutting depth and ultrasonic vibration amplitude,and the effects of spindle speed, feedrate and cutting depth on ultrasonic vibration amplitude. The results show that actual cutting depth is determined by effective superpositied ultrasonic vibration amplitude and cutting depth. The ultrasonic vibration amplitude stays unchanged with the changes in input variables (spindle speed, feedrate, and cutting depth), which can ensure the dimensional accuracy of the workpiece during RUM.