孔加工在机械加工工业中占有重要的地位。据统计,就其加工工作量而言,孔加工工作量约占整个机械加工工作量的30%左右。孔加工刀具不论在设计、制造还是使用上,都有其本身的特点。铰刀是用来对中、小直径孔进行精加工的一种精密刀具。它在预制孔上仅切下很薄的一层金属,如果设计正确,制造精良,使用得当,可以获得较高的尺寸精度和几何形状 Hole machining in the machining industry occupies an important position. According to statistics, in terms of its processing workload, hole processing workload accounts for about 30% of the entire machining workload. Hole processing tool in terms of design, manufacture or use, has its own characteristics. Reamer is used to medium and small diameter holes for precision machining of a precision tool. It cuts only a thin layer of metal on the prefab hole, and if properly designed, is well-made and properly used for high dimensional accuracy and geometry