单激励纵扭复合超声铣削系统研究

针对切削、焊接过程中超声复合振动能获得较高加工质量、效率及有助于延长刀具使用寿命，研究分析纵扭复合超声铣削系统运动特性及切削轨迹特征；基于斜梁振动原理，提出加工工艺简单、制造成本低的斜梁式超声变幅杆，并利用有限元软件ANSYS进行结构动力学分析, 证实通过单向激励可产生纵扭复合振动；应用研制的纵扭复合超声振动铣削系统对碳纤维复合材料进行切削试验，获得较好加工效果，从而验证理论分析与数值模拟结果的正确性。

Study on a new type of single actuator driven longitudinal-torsional composite ultrasonic milling system

Ultrasonic composite vibration not only helps to improve machining quality and efficiency in the cutting and welding process, but also helps to extend the service life of the cutter. Therefore, the motion characteristics and cutting trajectory features of longitudinal-torsional composite ultrasonic milling system were analyzed. Then, based on the vibration theory of oblique beam, the ultrasonic horn with oblique beams which have simple processing technology and low manufacturing cost was proposed. Meanwhile, the fact that the single longitudinal excitement could generate longitudinal-torsional composite vibration was proved through finite element analysis of structural dynamic characteristics of the ultrasonic horn. Finally, the longitudinal-torsional composite ultrasonic milling system was carried out on the carbon-fiber composites. The results showed that longitudinal-torsional composite ultrasonic vibration could improve the milling effect, and proved that the theoretical analysis and numerical simulation were correct.