超精密切削用刀具超声激振机构的设计

Ultrasonic tool vibrator for vibration-assisted ultra-precision cutting

该文设计一种基于夹心式压电陶瓷结构的刀具超声激振机构,用于超声振动辅助金刚石刀具进行超精密切削。通过分析超精密切削技术需求,提出了激振机构结构设计方案,进行了解析设计和有限元仿真分析,制作出激振机构,进行了性能测试,并开展了超声振动辅助切削的可行性实验。研制的激振机构可实现频率42.0kHz、振幅峰峰值8μm的超声激振,并在超声振动辅助金刚石刀具超精密切削中表现出良好效果,切削模具钢工件端面达到表面粗糙度Ra 0.018～0.05μm。

Ultrasonic vibration-assisted cutting is used in ultra-precision machining. This paper describes an ultrasonic tool vibrator based on a sandwiched piezoelectric transducer. Both acoustical methods and finite element analyses were used to design the sandwiched piezoelectric based vibrator. The vibrator has a vibration frequency of 42.0 kHz and an amplitude of 8 μm. This provides good vibration assisted ultra precision cutting of die steels, giving a surface roughness of Ra 0. 018 - 0, 05μm.