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读了《中国设备管理》1996年第3期“100-1=?”一文后,笔者想起了曾参加排除的一次设备故障,情况大致如下。 我厂二金工车间使用镗杆直径160mm落地式镗铣床加工一大件的圆柱孔,其直径250mm,长320mm,圆柱度允差0.025mm。加工时,工件固定,用镗杆进给,半精镗后出现的锥度超过0.1mm。 经分析,是由于切削振动使刀杆锥柄在镗杆锥孔中逐渐松劲,而形成孔的圆柱度误差过大。 该镗床使用的刀杆锁紧销如图1a所示。由于锁紧销与镗杆锥孔的A处和刀杆销孔的B处接触面积甚小,A
Read “Chinese equipment management” 1996 the third period “100-1 =?” After a text, I remembered participated in the exclusion of a device failure, the situation is as follows. I plant two gold shop boring bar diameter of 160mm boring and milling machine processing a large hole, the diameter of 250mm, length 320mm, cylindrical tolerance of 0.025mm. Processing, the workpiece is fixed, with the boring bar feed, semi-fine boring taper than 0.1mm. The analysis is due to cutting vibration taper shank taper hole in the boring bar gradually loose, and the formation of the hole cylindricity error is too large. The tool bit locking pin used on the boring machine is shown in Figure 1a. As the locking pin and boring bar taper hole A and the shank hole B contact area is very small, A