一、前言自贡塑料机械厂生产的木工圆锯是一种优良的机动刀具。产品在全国各地区广泛销售,年产量达十万张以上。但长期以来,产品质量不稳定,在使用过程中有“崩刃”、“飞片”、“塌齿”等现象发生,热处理工艺制度不能满足[JB—2906—81]部颁木工圜锯标准所规定的同片硬度差及韧性指标要求。为提高产品质量,赶上和超过国内外同行业先进水平,自八三年起,重庆大学金属 I. Introduction Zigong Plastic Machinery Factory production of woodworking circular saw is an excellent mobile tool. Products widely sold in various regions of the country, annual output of more than 100,000. However, the quality of products has been unstable for a long time. In the course of using, there are phenomena such as “chipping off”, “flying flakes” and “crooked teeth”, and the heat treatment process system can not satisfy the [JB-2906-81] The provisions of the same piece of hard and toughness toughness index requirements. To improve product quality, to catch up with and surpass the domestic and foreign advanced level in the same industry, since 1983, Chongqing University metal