Overall composite bulging production process for car drive axle

The invention relates to an overall composite bulging production process for a car drive axle. The process comprises the following steps of 1) blanking; 2) opening process holes; and 3) bulging. The bulging comprises the following steps that a, an axle shell workpiece is put into a bulging outer die; b, a bulging inner die extends to the bulging deforming area of the axle shell workpiece from an inner hole in one end of the axle shell workpiece; c, the bulging outer die is closed; d, thrust devices positioned at two ends of the bulging inner die are utilized to respectively apply equal thrust parallel to the axial direction of the axle shell workpiece to the bulging inner die; a pressure generating device is utilized to apply pressure vertical to the axial direction of the axle shell workpiece to an upper die block and a lower die block; the thrust is decomposed into thrust vertical-component acting on the upper die block and the lower die block and vertical to the axial direction of the axle shell workpiece and thrust parallel-component parallel to the axial direction of the axle shell workpiece under the action of a link mechanism, and the bulging force applied to the axle shell workpiece is resultant force of the bulging thrust vertical-component and the pressure; the axle shell workpiece is bulged and deformed under the action of the and bulging force; and e) unloading and die unloading are carried out.