The die-casting pores are widely found in castings. How to solve the hole defects of castings has always been a headache for many manufacturers. Because of the pores, many castings with pressure requirements have to be scrapped, resulting in waste of production costs. The product impregnated by the excellent infiltration process can not only save the cost of poor quality, but also fully meet the requirements of temperature resistance, vibration resistance, sealing, etc., and at the same time further improve the compactness and timeliness of the casting. Infiltration is the best solution to solve the problem of casting porosity and cost saving. With the higher requirements of environmental protection and quality in the world, infiltration is not simply a temporary plugging of unqualified products, but more It is a guarantee of quality. Infiltration in the automobile industry in developed countries has become a necessary process; in China, infiltration has become more and more important.