The method of using the technological processes of cutting off and compound cold extruding to form the fiber joint pedestal blanks in one operation were introduced, and the main structure of the die were described.

In view of low material utilization of the traditional forming processes for irregular parts with high strength,the warm/cold compound extrusion process was introduced through the process analysis of a typical irregular parts with high strength.

The physical simulation of combined extrusion about the products with deeper and thinner hole;

The numeric simulation and study of experiments in combined extrusion forming of vehicle hub axles;

On the basis of analyses of combined extrusion, the upper bound model of continuous velocity fields is defined, the effect of die geometric parameters on neutral point radius is analyzed, and the radius formula is given, the volume distribution of right and opposed outlets is forecasted and verified by experiments.