少无切削加工方法,是一项重要的工艺变革。普通的切削加工,金属的利用率很低。在一般的情况下,零件成品是毛坯重量的百分之五十至六十。一九七六年一机系统,一年消耗钢材350万吨。每年要有140～175万吨钢材变成废屑。生产一百五十万吨钢材,需要铁矿750万吨,电力四亿五千度,焦炭90万吨。还需要大量工艺辅助材料。因此, Less cutting-free processing is an important process change. Ordinary cutting, metal utilization is very low. In the general case, the finished part is 50 to 60 percent of the weight of the blank. In 1976, one machine system consumed 3.5 million tons of steel a year. Every year, 1.4 to 1.75 million tons of steel are turned into scrap. The production of 1.5 million tons of steel requires 7.5 million tons of iron ore, 450 million kWh of electricity, and 900,000 tons of coke. Also need a lot of process aids. therefore,