一、问题的提出:确定机械加工余量的方法有三种:查表法、经验法、理论计算法。前两者是在实践的基础上建立起来的,目前较为普遍采用。但其确定的加工余量都偏大,因此将造成大量原材料浪费。据统计约有60%的原材料变成铁屑,这样就增加了产品成本。随着科学技术的发展,对工艺方法和设备精度都有很高要求的情况下,若仍然采用查表法,经验 First, the question put forward: There are three ways to determine the machining allowance: look-up table method, empirical method, theoretical calculation method. The first two are established on the basis of practice, which is now more commonly used. However, its processing margin is too large, which will result in a lot of waste of raw materials. According to statistics, about 60% of the raw materials become iron filings, thus increasing the product cost. With the development of science and technology, the precision of process methods and equipment have high requirements, if still using look-up table, experience