Abstract
Casting process parameters should be adjusted as optimum to meet customer requirements. Computer aided simulation is a unique way to determine optimum process parameters and to predict possible risks and casting defects. Since there are several defect types, estimation of process risks and taking precautions quickly and precisely before the production with the help of computer simulation is a must for casting processes. In this study, unpressurized gating system design for ductile iron casting is investigated. Choke area which effects molten metal velocity and pouring time directly is calculated. The sprue and gates are designed according to the calculations. Satisfactory results were achieved when the casting part specifications and simulation outputs were compared.