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1.越程a的大小,对孔端的加工尺寸影响较大。与一般内圆磨削的道理相同。越程过大,砂条在孔两端的接触面积大为减少,比压增大,金属切除量增加,使两端孔径扩大。在加工浅孔时尤为突出。越程过小,则会发生孔端直径小于中间直径的情况。一般取a=(1/3～1/4)l_(砂条)较为合适。为纠正珩前孔的几何形状,对大端孔可取:a=1/4l_(砂条)(这时切削长度较短,可减少大端金属切除量),小端孔可取a=(1/2～1/3)l_(砂条)(这时切削长度较长,可增加小端金属切除量)。
1. The more the size of a process, the hole end of the larger processing size. And the general internal grinding the same reason. The overpass is too large. The contact area between the two ends of the sand bar is greatly reduced, and the specific pressure is increased, the amount of metal removal is increased, and the aperture at both ends is enlarged. In the processing of shallow hole is particularly prominent. If the over range is too small, the hole diameter will be smaller than the middle diameter. Generally take a = (1/3 ~ 1/4) l_ (sand) is more appropriate. In order to correct the geometric shape of the front hole, the large end hole is desirable: a = 1 / 4l_ (sand bar) (then the cutting length is shorter, can reduce the large metal removal) 2 ~ 1/3) l_ (sand) (then cut longer, can increase the amount of small metal removal).