The filling and solidification process of gypsum mold Low-pressure casting shell were simulated by View Cast software.According to the simulated results

the size and location of possible defects in shell castings were predicted.The simulated results reveal that there exist a large area of shrinkages in the ear position of shell castings.The flake shrinkages appear in the side of the first produced castings.The position and cause of defects generated was analyzed

and the initial process was optimized by changing process parameters

such as increasing the chiller at the thick wall

adding the ingate

then the solidification simulation was carried out again.The final simulated results reveal that the optimized process scheme can reduce casting defects

presenting its feasibility.There exist no defects in the actual production

meeting the production requirements.