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四、各种材料的阀孔加工 1.铸铁件阀孔的加工据有关资料统计,在现有的机械零件孔加工中有50％是铸铁材质的,而液压阀的铸铁件又占80％以上,所以,研究铸铁件阀孔的加工是具有特殊意义的。本文上述的孔加工基本上是铸铁件的,对于孔的粗加工已有论述,此处仅讨论孔的精加工和半精加工。孔的半精加工,我国采用标准铰刀、推刀、长刃螺旋铰刀、刚性镗铰刀和珩磨头作为半精加工刀具。在我国液压行业中,刚性镗铰刀半精加工阀孔应用最广,它的优点是加工质量稳定,孔表面光洁度可
Fourth, a variety of materials, valve hole machining 1. Cast iron valve hole processing According to statistics, in the existing mechanical parts hole processing is 50% of cast iron material, and hydraulic valve cast iron accounted for more than 80% Therefore, the study of cast iron valve hole processing is of special significance. The hole machining described herein is basically cast iron, and the roughing of holes has been discussed. Only the hole finishing and semi-finishing are discussed here. Hole semi-finishing, our standard reamer, push knife, long edge screw reamer, rigid boring reamer and honing head as a semi-finishing tool. In China’s hydraulic industry, rigid boring reamer semi-finishing valve hole is the most widely used, it has the advantage of stable processing quality, pore surface finish can be