For solving the problems existing in the actual production of automobile brake hub castings

the lost foam casting process of automobile brake hubs was simulated by the ProCAST software.The influence of the temperature field of the castings on the shrinkage cavities and porosity was analyzed

and the process optimization of the lost foam casting process was carried out.The results show that with the bottom injection type pouring system

the metal liquid filling process presents even and stable to fully fill the cavity.By adding a ring riser on the top and increasing the wall thickness of the top wall of the castings

the temperature field during the solidification process can be improved effectively

and the potential shrinkage cavities and porosity in the brake hub are reduced

and the shrinkage cavities and porosity are basically distributed in the sprue.There are absence of shrinkage porosity（holes）in the brake hub by using X-ray

greatly improving the qualified rate of the castings.