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我厂生产塑料挤出机,其中关键部件——机筒的加工属于深孔加工。历年来,在镗制内孔时对于公差和平整度的要求,均不能进行较严格的控制,故此道工序的质量合格率仅达70％左右。不但造成大量优质钢材(38Cr-MoAlA)的浪费,同时生产计划也无从落实,长期以来陷于被动地位。经多次分析、研究,终于发现了形成废品的原因。因此,对原有的深孔加工工艺进行了改革。七七年八月进行首次改革后的生产实践,产品合格率
I plant the production of plastic extruder, of which key components - barrel processing is deep-hole processing. Over the years, the requirements of tolerance and flatness when boring the inner hole can not be more strictly controlled, so the pass quality of the procedure is only about 70%. Not only waste of a large amount of high-quality steel (38Cr-MoAlA), but also the production plan can not be implemented, and has long been in a passive position. After many analysis, research, finally found the reason for the formation of waste. Therefore, the original deep hole processing technology has been reformed. In August 1977, the first post-reform production practice, product qualification rate