Axle housing forming process

The invention relates to an axle housing forming process, comprising the following steps: 1) cutting joints, so that corresponding long joints extending along the axial direction of a pipe body are respectively formed on two opposite sides of the pipe body; 2) heating, specifically heating the pipe body, so that the two sides of the long joints of the pipe body are prone to deformation under the action of external force; 3) air expansion, instantaneously introducing compressed air from the two ends of the pipe body, so that the pressure in the pipe body is instantaneously increased, under the action of the internal and external pressure difference, the parts, located on the two sides of the long joints, of the pipe body expand outwards under the impact force of the compressed air, and then a containing space for containing an auxiliary mold is formed; 4) opening, specifically after the auxiliary mold is placed in the containing space, using opening equipment for opening the auxiliary mold so that the long joi