There are many factors that affect the quality of castings. The first is the design process of castings. When designing, in addition to determining the geometry and size of the casting according to the working conditions and the properties of the metal material, the rationality of the design must also be considered from the perspective of the casting alloy and casting process characteristics, that is, the obvious size effect and solidification and shrinkage , Stress and other issues to avoid or reduce the occurrence of defects such as segregation, deformation, and cracking of castings. Second, there must be a reasonable casting process. That is, according to the casting structure, weight and size, casting alloy characteristics and production conditions, select the appropriate parting surface and shape, core making method, and reasonably set the casting rib, cold iron, riser and gating system. To ensure high-quality castings. The third is the quality of raw materials for casting. The quality of metal furnace charge, refractory materials, fuel, flux, modifier, foundry sand, sand binder, paint and other materials is substandard, which will cause pores, pinholes, slag inclusions, sand sticking and other defects in the castings, which will affect the appearance quality of the castings And internal quality, if serious, the casting will be scrapped. The fourth is process operation. It is necessary to formulate reasonable process operation procedures to improve the technical level of workers so that the process regulations can be implemented correctly.