The invention discloses an overall
thermal expansion manufacturing method for a heavy-duty car drive axle housing, and overcomes the problems that currently, material
utilization rate is low, machinery
processing load is heavy, the
punching and
welding production process chain is long,
welding workload is heavy, product rigidity is low, and service life is short. The method includes 1, determining the structural size of a used billet, namely selecting the appropriate
expansion ratio according to geometrical features and size parameters of an axle housing to be processed, determining the
diameter of the specification of the billet to be D0, the wall thickness to be H0 and the length to be L0; 2, preforming the billet before
thermal expansion; 3,
cutting prefabricated hole in the middle of the preformed billet, namely
cutting axial elongated prefabricated through holes in the
bedding face after the middle of the billet is flattened and allowing an upper prefabricated through hole and a lower prefabricated through hole to be centered; 4, preforming in the manner of
thermal expansion; 5, forming in the manner of thermal expansion; 6, shaping, namely eliminating drive axle housing lute holes and unrounded degree of a lateral
flange after twice thermal expansions and allowing the
radius of the large arc of an axle housing transition area to be 200mm.