Study on Inclusion and Shrink Hole Elimination of EPC Ductile Iron Reducer Housing

Author of the article:ZHOU Rui1 , ZHANG Weijiang1 , LIU Wangqiang1 , LIU Gaofeng1 , DAN Yao1 , ZHAO Fangfang2

Author's Workplace：1. Shaanxi Fast Group Co., Ltd., Baoji 722409, China; 2. Xi’an Hua Ou PrecisionMachineryCo., Ltd., Xi’an 710000, China

Key Words：lost-foam casting; ductile iron reducer housing; shrinkage cavity; inclusion; heat dissipation process; flexible chill

Abstract：The ductile iron reducer housing was produced by EPC. The defects of inclusion and shrinkage appeared on the end of the reducer housing. The inclusion in the end face of the reducer housing was solved by increasing the allowance in the end face of the casting. The new heat dissipation technology and flexible chiller technology were explored, and the negative pressure in the casting process was strictly controlled to solve the shrinkage hole defects in the hot joint area of the casting. The results show that both the heat dissipation process and the flexible chiller process can solve the shrinkage hole defects of EPC ductile iron reducer housing, and the process is simple and the process yield is high.