小直径CBN杯形砂轮端面磨削沟槽底面的加工精度分析及其改善

Analysis of Machining Precision of Face Grinding Groove Bottom with Cup CBN Quill

本文研究了小直径CBN杯形砂轮端面磨削沟槽底面时砂轮粒度和加工过程参数对已加工表面粗糙度 ,沟槽底面与侧面过渡圆弧半径的影响。采用电镀工艺制造的砂轮时由于CBN磨粒随机分布于砂轮表面 ,磨粒尺寸对已加工表面粗糙度Rz 没有显著影响 ,底面与侧面的过渡圆弧半径rn 则随着磨粒尺寸增大而增大。基于此结果开发了新型小直径端面CBN砂轮 ,Rz 在 4 μm以下 ,rn 达到 0 .0 8～ 0 .0 5mm。

The experimental research on wheel grain size and machining process parameters affecting ground surface roughness, corner radius between groove bottom and groove flank is carried out in grinding groove bottom by using cup CBN wheel with shift(named CBN quill). When using electroplated CBN wheel, the CBN grain size being raised up from 230 # to 80 #, the ground surface roughness R z is stabilized,but the corner radius r n is remarkably increased because the CBN grains are random on the wheel surface. In view of above analyses,a new type of cup CBN quill is developed,its ground surface roughness R z under 4μm and corner radius r n of 0.08～0.05mm can be reached.