The first is the design process of cast iron parts. When designing, in addition to determining the geometry and size of iron castings according to the working conditions and metal material properties, the rationality of the design must be considered from the perspective of casting alloy and casting process characteristics, that is, the obvious size effect and solidification, shrinkage, stress and other issues, in order to avoid or reduce the composition of cast iron segregation, deformation, cracking and other defects.

Second, there must be a reasonable casting process. That is, according to the structure, weight and size of cast iron parts, casting alloy characteristics and production conditions, select the appropriate parting surface and modeling, core-making method, reasonable setting of casting ribs, cold iron, riser and gating system. To ensure access to high-quality cast iron parts.

The third is the quality of raw materials used in casting. The substandard quality of metal charge, refractory material, fuel, flux, modifier, casting sand, molding sand binder, paint and other materials will cause defects such as porosity, pinhole, slag inclusion, sand sticking, etc., which will affect the appearance quality and internal quality of cast iron parts, and will cause cast iron parts to be scrapped in serious cases. The fourth is the process operation. It is necessary to formulate reasonable process operation procedures, improve the technical level of workers, and make the process procedures be implemented correctly.

In manufacturing and production, the quality of castings should be controlled and inspected. The first step is to develop process codes and technical conditions for the control and inspection of raw materials and auxiliary materials to each specific product. Each process is controlled and inspected in strict accordance with the process rules and technical conditions. Finally, the quality inspection of the finished castings. To be equipped with reasonable detection methods and appropriate testing personnel. Generally, the appearance quality of professional cast iron parts can be judged by comparing sample blocks to judge the surface roughness of castings. The fine cracks on the surface can be inspected by coloring method and magnetic particle method.