超声椭圆振动切削轨迹变化对表面形貌的影响

通过改变刀尖振幅和相位差，研究超声椭圆振动切削过程中刀尖轨迹变化的运动特性。分析椭圆振动切削轨迹形状和轨迹偏转变化对加工表面形貌的影响，建立椭圆振动切削轨迹变化切削方向残余高度模型；利用研制的导波传输超声椭圆振动切削装置，改变相位差实现椭圆振动切削轨迹精准控制，分析对其加工表面质量的影响。实验结果表明：椭圆振动切削轨迹变化同时引起的切削方向残余高度和刀具动态角变化是影响加工表面质量的重要因素；在超声椭圆振动切削加工中存在一个相位差值，对抑制毛刺和崩边、提高加工表面质量具有最佳的效果。

Influence of Ultrasonic Elliptical Vibration Cutting Trajectory Change on Surface Morphology

The motion characteristics of tool tip trajectory in ultrasonic elliptical vibration cutting are studied by changing the tool nose's amplitude and phase difference. The influences of elliptical vibration cutting trajectory shape and trajectory deviation on the machined surface morphology are analyzed, and a residual height model formed by the change in elliptical vibration cutting trajectory in cutting direction is established. A self-developed ultrasonic elliptical vibration cutting device is used to accurately control the change of elliptical vibration cutting trajectory achieved by changing the phase difference, and the influence of cutting trajectory change on the machined surface quality is analyzed. The experimental results show that the residual height in cutting direction and the change of tool dynamic angle caused by the cutting trajectory change are the important factors affecting the machined surface quality. A phase difference in ultrasonic elliptical vibration cutting is beneficial to restrain the burr and edge collapse and improve the surface quality.