Iron casting products

The factors influencing the quality of iron castings are as follows
1. It is the design technology of iron castings. In order to avoid or reduce the composition segregation, deformation, cracking and other defects of iron castings, it is necessary to consider the rationality of design from the perspective of casting alloy and casting process characteristics in addition to determining the geometry and size of iron castings according to working conditions and metal material properties.
2. Reasonable casting technology is needed. That is to say, according to the structure, weight and size of iron castings, casting alloy characteristics and production conditions, the appropriate parting surface, molding and core making method should be selected, and the casting rib, chill, riser and gating system should be set reasonably. In order to protect and obtain excellent iron castings.
3. It is the quality of raw materials for casting. If the quality of metal charge, refractory, fuel, flux, modifier, foundry sand, molding sand binder, coating and other materials is not up to standard, the iron castings will have defects such as air hole, pinhole, slag inclusion, sand sticking and so on, which will affect the appearance quality and internal quality of iron castings, and in serious cases, the iron castings will be scrapped. The fourth is the process operation. We should formulate reasonable process operation procedures, improve the technical level of workers, and correctly implement the process procedures.
In manufacturing production, the quality of castings should be controlled and inspected. First of all, it is necessary to formulate process rules and technical conditions from raw materials, auxiliary materials to control and inspection of each specific product. Each process is strictly controlled and inspected according to the process rules and technical conditions. After that, the quality of the finished castings was inspected. Reasonable testing methods and suitable testing personnel should be provided. Generally, for the appearance quality of dedicated service iron castings, the surface roughness of castings can be judged by comparison samples; Fine cracks on the surface can be inspected by coloring method and magnetic particle method.