After 1, precision casting, casting mechanical finishing, deburring, edge smooth, rust removal, scale, improve the surface stress.Increased after T6 treatment, improve the mechanical properties, corrosion resistance, improve the processing performance, size stability. Finally tracked hook type shot blasting, shot peening or make precision casting products meet appearance and inner beauty.2, on the basis of other aluminum castings production process increased the impregnation process, improve the casting compactness and corrosion resistance.Castings after pouring cooling mold to retrieve, gate and riser, metal burr, feng and line, the development trend of precision casting products is the requirement of castings have better comprehensive performance, higher precision, less allowance and more bright and clean surface.   Precision casting production mechanization automation at the same time of constantly improve, will be more the flexible production direction, to expand its adaptability to different production batch and many varieties.