【摘要】 超精密加工是获得超光滑高质量工件表面的重要手段,其加工条件和工艺参数对超精密加工质量有重要影响。文章设计了振幅梯度变化的T形零件进行单晶金刚石超精密端面车削,获得了不同振动条件下的加工表面形貌,振动激烈的部位形貌刀痕深度大,呈一字形重叠,粗糙度大;离中心点较近的大部分中间区域振动最小,表面呈光滑镜面;过渡区域振动平缓些,表面会出现很多类似丘陵状或鱼鳞状的多边形。探索了超精密加工进给量、主轴转速及切削深度对加工表面质量的影响。结果表明随切削进给量的增加,表面粗糙度变大;随着主轴转速增大,表面粗糙度变小,但当主轴转速增大到一定值时,表面粗糙度反而有增大的趋势;随着切削深度的增加,表面粗糙度也变大,并且从工艺参数与表面粗糙度的关系示意图可以看出,切削深度对表面粗糙度的影响要小于进给量和主轴转速对其的影响。更多还原

【Abstract】 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.更多还原