椭圆振动辅助车削7075铝合金表面微织构及其特性

Surface Micro-texture Characteristics of 7075 Aluminum Alloys by Elliptical Vibration Assisted Turning

为研究椭圆振动车削技术辅助微织构制备的工艺及其加工后微表面特性,采用椭圆振动原理和微织构的形成原理分析了不同转速和进给速度下的微织构变化规律,进行椭圆振动轨迹测量试验和椭圆振动车削试验,分析了装置振动轨迹、表面形貌、单个微织构几何尺寸及表面粗糙度变化情况。试验结果表明,在切削试验过程中,相比传统车削,由于车刀的空间椭圆运动轨迹,超声椭圆振动车削后表面呈现类椭圆状的微织构凹槽。由理论分析和试验结果得出,随着转速和进给速度的改变,微织构凹槽的几何尺寸、轮廓高度及表面粗糙度均会发生规律性变化。

To study the fabrication processes of micro-texture for the elliptical vibration assisted turning technique and the characteristics of machined micro-surfaces,the change rules of surface micro-texture was analyzed with vibration principle of ellipse and the micro-texture formation under different speeds and feed rates.The vibration track,surface topography,single micro-texture geometry size and surface roughness were analyzed under the elliptic vibration track measurement tests and elliptic vibration turning tests.The analysis results show that in the turning test processes,compared to the common turning,due to the space elliptic movement of the tool,the surface of ultrasonic elliptical vibration turning presents micro-texture grooves similar to ellipse.With the changes of rotation speed and feed rate,it indicates that the geometric size,profile height and surface roughness of micro-texture grooves will change regularly based on the theoretical analyses and experimental results.