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一、前言目前,冷挤压工艺已在机械、汽车,仪器制造及电子,包装等工业中广泛应用,挤压工艺具有节省材料,生产效率高,产品精度高,表面质量好,机械性能好,便于实现机械化生产等优点,特别是薄壁件挤压成形及等壁管挤压成不等壁管的冷挤压工艺更为先进。据日本有关资料介绍,冷挤压自行车架管和管接头的专用设备,已列为国家专利。这样的冷挤压工艺方法,有的采用纲性凸凹模,有的采用钢性凹模,软介质凸模或
I. Introduction At present, the cold extrusion process has been widely used in machinery, automobile, instrument manufacturing and electronics, packaging and other industries. The extrusion process has the advantages of material saving, high production efficiency, high product precision, good surface quality, good mechanical properties, Easy to realize the advantages of mechanized production, especially thin-walled parts extrusion and wall pipe extrusion into different wall tube cold extrusion process more advanced. According to the Japanese information, cold extrusion bicycle pipe and pipe fittings for the special equipment, has been listed as a national patent. Such cold extrusion process methods, and some use of the outline of punch and die, and some use of steel die, soft media punch or