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在孔加工中,主要的质量问题有:(1)孔径扩大;(2)孔形不圆或呈多边形;(3)锥孔;(4)孔径缩小;(5)表面光洁度不高。对上述问题,我们经过生产实践,摸索出一些改进方法,现分述如下: 1.防止孔径扩大影响孔径扩大的主要因素有二点:钻头摆差过大和切削刃不对称。钻头摆差过大的原因是钻头与钻套或钻套与钻床主轴的不同心。因此,钻孔前必须清除各配合部分的毛刺和脏物,要求钻头端部径向摆差不大于0.03～0.05mm,否则就应进行修磨或调整。切削刃不对称,两刃受力必然不均匀。严重时会产生单边切削(见图1),导致定心不稳,孔径扩大。对两刃的轴向偏差应控制在0.02～0.04mm之间。因
In the hole machining, the main quality problems are: (1) pore size expansion; (2) hole shape is not round or polygon; (3) tapered bore; (4) pore size reduction; (5) surface finish is not high. The above problems, we through production practice, to explore some improvements, are as follows: 1. To prevent the expansion of the aperture expansion of the main factors that affect the expansion of two points: excessive bit deviation and cutting edge asymmetry. Drill bit too much difference is due to the drill bit and drill sleeve or drill sleeve and drill spindle. Therefore, the burr and dirt of each cooperating part must be removed before drilling, and the radial deviation of the end of the drill should not be more than 0.03 ~ 0.05mm, otherwise grinding or adjusting should be carried out. Cutting edge asymmetry, two-edge force inevitably uneven. Serious when it will produce unilateral cutting (see Figure 1), resulting in unstable centering, aperture expansion. The axial deviation of the two edges should be controlled between 0.02 ~ 0.04mm. because