Analysis and research on defective castings in precision casting

Analysis and research on the defects of precision castings is one of the key technologies to improve the yield. However, this is not difficult.
Specifically:
It covers a wide range of knowledge, including alloys, casting processes, molding materials, casting equipment and process inspections, etc.;
Second, there are many reasons for the defects of precision castings. One defect may be caused by multiple reasons, and the other defect may cause multiple reasons.
The limitation of technical measures, such as taking certain measures, can prevent certain defects from appearing, but may lead to another defect.
③Influencing factors are difficult to control, such as the quality of raw materials, air temperature and humidity, etc.
The operating goal of casting manufacturers is to maximize profits. Therefore, in the production process, the output should be increased as much as possible. The casting yield is the ratio of the total weight of the casting qualified parts to the total weight of the input metal charge.
According to the material and size of the castings, the yield rate is generally between 60% and 64%, medium castings are 64% to 70%, large castings are 70% to 80%, small castings are 50% to 55%, and small castings are 45%~50%; small castings: 38%~45%; large castings: 50%~55%; large castings: 50%~55%; malleable castings: 38%~45%.