随着科学技术的发展,国民经济各个部门对高强度钢、淬火钢、耐热钢、高温合金、高硬铸铁、钛合金等材料的采用日益增多。因为这些材料的切削性能很差,所以人们把它们称为难加工材料。在生产中往往由于采用的加工方法不当或选择刀 With the development of science and technology, various departments of the national economy have adopted more and more materials for high-strength steel, hardened steel, heat-resisting steel, high-temperature alloy, high-hard cast iron and titanium alloy. Because of the poor machinability of these materials, people call them hard-to-machine materials. In production often due to improper processing methods or choose the knife