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铰刀用来铰制2～3级精度的孔,而2～3级精度孔的公差数值很小。所以,大量的铰刀常因其公差超出公差下限而报废。因此,为了延长铰刀的使用寿命,铰刀的直径都按最大尺寸设计和制造。尽管如此,这种决定铰刀直径的方法,还没有解决刀具的浪费问题。虽然可调式铰刀能解决此问题,但是对于较小直径的铰刀,尤其是使用在批量加工中,还是不适应的。采用冷挤压修复的方法,对铰刀的消耗量和降低刀具的成本具有一定的经济效果。
Reamer used to articulate 2 to 3-level precision hole, and 2 to 3 precision hole tolerance value is small. Therefore, a large number of reamers often scrapped because of their tolerances outside the lower tolerance limit. Therefore, in order to extend the service life of the reamer, the diameter of the reamer is designed and manufactured to the maximum size. However, this method of determining the diameter of the reamer has not solved the problem of waste of the tool. Although the adjustable reamer can solve this problem, but for the smaller diameter reamer, especially when used in batch processing, or not suited. Cold extrusion repair method, the reamer consumption and reduce the cost of the tool has a certain economic effect.