加工复杂形状工件时，使用成形刀具，例如加工内孔，用阶梯镗刀和阶梯锪刀，加工外表面用成形铁刀、成形车刀或切口刀片，有很好的加工经济性，大批量生产时尤其这样。这样一些刀具制造厂形成的需求一直在增长，以致于这些复杂形状的成形刀具必须在制造时成本一效益更好，同时 The use of forming tools, such as machining boreholes, with stepped boring tools and stepped trowels, for forming workpieces of complex shapes, with forming tools such as forming iron knives, forming turning tools or cutting inserts, with good machinability, high-volume production This is especially true. The need for such tooling manufacturers has been growing so that these complex shaped forming tools must be cost effective at manufacturing time while