【摘要】 TC4钛合金因其优异的综合机械性能在航空、航天工业中得到了广泛应用，但其高塑性和低导热系数引起的刀具–切屑黏附是制约其铣削加工性能提升的一个关键因素。针对TC4钛合金铣削加工性能提升的需求，提出了一种基于刀具纵弯复合超声振动辅助铣削的加工方式，通过控制刀具纵弯复合超声振动的幅值和相位实现可控的间歇式切削，降低刀具–切屑黏附，从而提高TC4铣削加工质量。首先，从理论上解析了刀具纵弯复合超声振动辅助铣削的运动学原理，据此设计并制造了刀具纵弯复合振动轴，与高速铣削主轴安装后刀尖的径向跳动低于20μm。其次，搭建了三轴联动纵弯复合超声振动辅助铣削加工装置，据此进行了TC4钛合金纵弯复合超声振动辅助微铣削加工试验，并对试验结果进行了表征分析。结果显示，与普通铣削相比，对刀具施加纵弯复合超声振动有效地降低了切削力、毛刺生成和刀具磨损，并提升了表面加工质量，证明了应用刀具纵弯复合超声振动辅助提升TC4钛合金铣削加工性能的可行性。更多还原

【Abstract】 TC4 titanium alloy has been widely used in aviation and aerospace industry because of its excellent comprehensive mechanical properties. However, the high plasticity and low thermal conductivity of TC4 lead to pronounced tool-chip adhesion, which is a key factor restricting the improvement of its milling performance. In this paper,a longitudinal-bending hybrid ultrasonic vibration assisted milling method is proposed to improve the milling performance of TC4, through the reduction of tool-chip adhesion accompanied by the controllable intermittent cutting realized by individually controlling the amplitude and phase of longitudinal and bending ultrasonic vibration of the cutting tool. Firstly,the kinematics principle of longitudinal-bending hybrid ultrasonic vibration assisted milling is analyzed theoretically.Based on this, the longitudinal-bending hybrid ultrasonic vibration tool is designed and manufactured. After assembly of the vibration tool with the high-speed spindle, the radial runout of the milling tool is less than 20μm. Then, a threeaxis linkage equipment of longitudinal-bending hybrid ultrasonic vibration assisted milling is established, with which the vibration-assisted milling experiments of TC4 are carried out, and the experimental results are characterized and analyzed.The experimental results show that the applying of longitudinal-bending hybrid ultrasonic vibration to conventional milling effectively reduces the cutting force, the burr generation and the tool wear, while improving the surface machining quality,which demonstrate the feasibility of applying the longitudinal-bending hybrid ultrasonic vibration assisted milling in improving the milling performance of TC4 titanium alloy.更多还原