The 3D model of gear shaft and forming die are established with Auto CAD software and then imported into DEFORM 3Dsoftware to conduct the numerical simulation of cold extrusion

the influences of blank diameter and forming passes on the degree of filling and forming load are analyzed.Cold extrusion experiments are conducted according to the numerical simulation results

which indicates that the forming scheme by usingφ18.2mm blank and three forming passes is the most reasonable according to comprehensive analysis of forming quality and forming loads

and finally qualified products are obtained.