钛合金薄壁件高速超声椭圆振动铣削机理和试验

针对航空领域中钛合金薄壁件在铣削过程中存在加工精度差、加工效率低等问题，提出了钛合金薄壁件高速超声椭圆振动铣削的方法。首先，在铣削加工中引入高速超声振动切削理念，使切削刀具刀尖附加椭圆振动进行超声频断续切削，可改善加工质量且突破了超声振动加工对临界速度的限制。然后，分析了该方法的分离原理，采用独立研制的超声椭圆振动铣削刀柄装置针对钛合金薄壁件进行了切削试验。试验结果显示，高速超声椭圆振动铣削相较于普通铣削，切削力降低20%~30%，且已加工表面让刀量降幅20%~30%，表面缺陷减少，表面粗糙度降低。 

Mechanism and experiment of high-speed ultrasonic elliptical vibration milling of thin-walled titanium alloy parts

A high-speed ultrasonic elliptical vibration milling method is proposed for poor processing quality and low processing efficiency in milling of thin-walled titanium alloy parts in aerospace. Firstly, high-speed ultrasonic elliptic vibration milling combines high-speed ultrasonic vibration cutting concept with milling. A high-frequency intermittent cutting where the cutting tool tip moves in accordance with the elliptical trajectory can effectively improve the quality of machining and break through the limitations of the ultrasonic vibration processing on the critical speed. Then, the separation principle of the process is analyzed, and a self-developed ultrasonic vibration milling device is used in the experiment with thin-walled titanium alloy parts. The experimental results show that, compared to the common milling processing, the cutting force reduction and the relieving amount reduction for high-speed ultrasonic elliptical vibration milling method are both about 20% to 30%, and meanwhile the surface defects and roughness are cut down.