Optimization of cold extrusion process for internal spline

The traditional cold extrusion of internal spline is generated by direct forming process,in which the force from the blank to the die is big and the spline is uneasy to be taken out.So the cold extrusion process of internal spline has been simulated by use of FE software DEFORM-3D based on indirect forming mode.The results show that indirect forming which needs a pre-forming extra process can not only improve the production efficiency and the tool working life greatly but also guarantee the dimension accuracy of the end.The optimal forming hole size Ф equals 20.5mm and the half-angle α/2 equals 25°.