硬质合金凹模设计及强化措施吉林工业大学曾宪文，任先玉，李季云第一汽车集团公司轿车厂吴淑波用于汽车或其它机械的紧固标准件生产批量大，因而相应的模具供应量、模具质量及寿命等应能满足生产的需要。在利用冷镦工艺制造Ｍ１２或大于Ｍ１２规格的六角螺母时，采用了三... Carbide Die Design and Strengthening Measures Jilin University of Technology Zeng Xianwen, Ren Xiangyu, Li Jiyun First Automobile Group Corporation Wu Shubo used in automotive or other machinery fastening standard parts production volume, and thus the corresponding supply of molds, mold quality and Life expectancy should be able to meet the needs of production. In the use of cold heading process M12 or greater than the M12 specifications of the hex nut, the use of three ...