前言当前,世界上各汽车厂家都把研究的重点集中到产品的经济性和可靠性方面上,如何能降低产品成本,以便获得更好的经济性,将是关系到企业能否在竞争中长期立于不败之地的重要问题。在整个汽车工业中,冲压件的数量占其零件总数的60～75%,而冲压件的总成本中,材料的成本占60～80%,材料冲压的平均利用率为60～75%。为此,如何节约和合理使用原材 Preface At present, all the automobile manufacturers all over the world focus their research on the economic and reliability of products. How to reduce the cost of products in order to obtain better economy will be the key to whether enterprises can compete in the long term An important issue invincible. Throughout the automotive industry, the number of stamped parts accounts for 60-75% of the total number of parts. The total cost of stamped parts accounts for 60-80% of the total cost of materials and 60-75% for material stamped. To this end, how to save and rational use of raw materials