First, 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 performance of the metal material, it is also necessary to consider the rationality of the design from the perspective of the casting alloy and the casting process characteristics, that is, the obvious size effect and solidification, shrinkage, stress and other problems, in order to avoid or reduce the generation of defects such as segregation, deformation and cracking of the composition of the casting.
Second, there must be a reasonable casting process. That is, according to the structure, weight and size of the casting, casting alloy characteristics and production conditions, select the appropriate parting surface and shape, core making method, and reasonably set the casting bar, cold iron, riser and pouring system. To ensure a good casting.
Third, the quality of the raw materials used in casting. The quality of metal charge, refractory, fuel, flux, modifier, casting sand, sand binder, paint and other materials is not up to standard, which will cause defects such as pores, pinholes, slag inclusion, sand, etc., affecting the appearance quality and internal quality of castings, and will cause castings to be scrapped in serious cases. The fourth is the process operation, to formulate reasonable process operation procedures, improve the technical level of workers, so that the process procedures are correctly implemented.
