Hexin precision casting found in the process of casting, casting yield and many manufacturers have been increase, the yield of the casting with our casting technology is also have certain related closely related, technology in place, the casting yield is high back, so what affect the casting yield some technical reasons?Hexing precision casting in order to reduce casting defects, improve the yield of casting, casting defect must be effectively controlled.And accurate judgment of defect, it is prerequisite to solve the casting defects.Foundry workers, therefore, it is necessary to understand the defects of various analysis methods, including the general and special analysis method, to determine the type of defect, analysis its causes, and puts forward prevention measures, and implement it from the technology and management.