超声辅助磨削杯形砂轮变幅器设计与试验*

超声辅助磨削在硬脆材料的加工中应用广泛。为研制以杯形砂轮为加工工具的超声辅助磨削主轴附件式工具系统,建立了杯形砂轮变幅器的理论模型,推导了其频率方程,并通过Matlab开发了杯形砂轮变幅器设计软件。利用该软件结合有限元分析对杯形砂轮变幅器进行了设计。将研制的杯形砂轮变幅器与BT40刀柄一体化外套筒、导电滑环装配组成了杯形砂轮超声辅助磨削主轴附件式工具系统。对该超声振动系统进行了阻抗分析试验及超声谐振试验,结果表明,该超声振动系统阻抗性能较好,能够使杯形砂轮产生稳定的超声振动,验证了所提出的设计方法的正确性,为主轴附件式超声磨削装置的设计提供了理论参考。

Design and experimental investigation of cup wheel transformer used in ultrasonic assisted grinding

Ultrasonic Assisted Grinding (UAG) is widely used in the machining of hard and brittle materials. In order to design a spindle accessory of the UAG device with cup wheel, the frequency equation of the cup wheel transformer is established and a design software is developed by Matlab. A cup wheel transformer is designed by this software and finite element analysis. The developed cup wheel transformer is assembled with outer shell with BT40 tool holder and sliping ring to form a spindle accessory of the UAG device. The impedance test and ultrasonic resonance test of the ultrasonic vibration system are carried out. The results show that the ultrasonic vibration system has good impedance performance and and its vibration is stable. The design theory is verified, and provides a theoretical reference for the design of spindle accessory of the UAG device.