In the consumption of copper castings, the common casting defects are pores, pinholes, casts showing worm-like or partially black, tin sweat and lead sweat, slag inclusion, segregation, shrinkage, shrinkage, lack of pouring (lack of meat), Cold separation and so on. In general, the cause of these defects is not only the problem of smelting and casting, but also the problems of many consumer processes such as external core making, sand quality, falling sand clearing, etc., and therefore detailed analysis is required. In order to take appropriate reasonable measures to deal with.