卧式振动式滚磨光整加工非自由状态工件的试验研究

Experimental Study on the Horizontal Vibration Finishing Process for Non-free Parts

通过在卧式振动式滚磨光整加工X-Z平面上不同位置处进行工件加工试验和工件受力测试,从作用力的角度探究振动式滚磨光整加工机理,以指导实际加工和生产。改变工件加工位置发现,工件埋入滚抛磨块深度相同时,水平方向上各位置处工件的表面粗糙度归一化值R_a~*下降速率和平均作用力均较为接近;而表面粗糙度下降速率和平均作用力受埋入深度的影响非常显著。工件位于滚抛磨块流表层时,R_a~*下降速率最高且工件所受平均作用力最大;工件位于滚抛磨块流中央位置时,R_a~*下降速率且所受平均力均达到最低值。经曲线拟合发现,R_a~*与所受平均力成二次函数关系。同时对比工件加工前后微观形貌发现,工件位于滚抛磨块流表层时,滚磨加工前的刀痕完全去除,表面均匀性一致;工件位于底层时,刀痕基本去除,但表面均匀性较差;工件位于中间位置时,刀痕得到轻微细化,仍清晰可见。

The processing and force test of workpiece at different locations in the X-Z plane of the tube vibratory finishing were implemented. The process mechanism of vibratory finishing was investiga- ted from the force perspective to guide the actual processing and production. By changing the processing location of the workpiece, the decrease rate of the surface roughness normalized value R2 and mean force at different sampling points in the horizontal direction were found to be wholly close to each other at the same depth of abrasives, which significantly affects the decrease rate and mean force. Meanwhile, the decrease rate of R2 and mean force are maximum when the workpieoe is located at the surface layer of abrasives while they are minimum when the workpiece is located at the center of abrasives. The curve fit- ting shows that R＊ is related to the quadratic function of the mean force. Furthermore, the surface tex- tures of the workpiece before and after finishing were observed. When the workpiece is located at thesurface layer of abrasives, the marks are completely removed and the surface uniformity is excellent; when the workpieoe is located at the bottom layer, the marks are basically removed while the surface u- niformity is relatively poor when the workpiece is located at the center, the marks are slightly refined but still clearly visible.