Experimental study on surface morphology of ultra-precision turning

Ultra-precision machining is an important means to obtain ultra-smooth and high-quality surface. Its processing conditions and process parameters have an important impact on the quality of ultra-precision machining. In this paper, T-shaped parts with amplitude gradient change are designed for ultra-precision turning of single crystal diamond. The machined surface topography under different vibration conditions is obtained. The topography of the parts with intense vibration has a deep cutter mark, a glyph overlap and a large roughness. Most of the middle areas near the center point have the smallest vibration and the surface is smooth mirror. The transition zone vibrates more smoothly, and there are many hilly or scaly polygons on the surface. The effects of feed rate, spindle speed and cutting depth on the surface quality of ultra-precision machining were explored. The results show that with the increase of cutting feed, the surface roughness increases; with the increase of spindle speed, the surface roughness decreases; when the spindle speed increases to a certain value, the surface roughness tends to increase; with the increase of cutting depth, the surface roughness also increases, and from the process parameters and surface roughness. The relationship diagram shows that the influence of cutting depth on surface roughness is less than that of feed rate and spindle speed.