Design manufacturability of cast iron. When designing, in addition to determining the geometry and size of the cast iron according to the working conditions and metal material properties, 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, solidification, etc. Shrinkage, stress and other problems to avoid or reduce the occurrence of defects such as composition segregation, deformation and cracking of iron castings.

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

In manufacturing, the quality of castings should be controlled and inspected. First of all, it is necessary to formulate process codes and technical conditions from raw materials and auxiliary materials to the control and inspection of each specific product. Each process is strictly controlled and inspected according to the process code and technical conditions. Finally, the quality inspection of the finished castings is carried out. To be equipped with reasonable testing methods and appropriate testing personnel. Generally, for the appearance quality of professional iron castings, the surface roughness of the castings can be judged by comparing the sample blocks; the fine cracks on the surface can be inspected by the coloring method and the magnetic powder method.