关键词: 超声波椭圆振动车削, 7075铝合金, 微织构形成机理, 微织构, 表面粗糙度

Abstract: 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.

Key words: ultrasonic elliptic vibration assisted turning, aluminum alloy, mechanism of micro-texture formation, micro texture, roughness