Based on the finite differential method

the temperature field in the solidification process of ductile iron grinding ball in permanent mold was simulated by employing self-developed simulation software.The possible defect position in the grinding ball was forecasted.The origination of shrinkage holes in the grinding ball was analyzed.The gating system was modified to optimize design by adding sand sleeves

shortening ingates and reducing the sprue size as well as other methods.The temperature field of the gating system optimized was simulated.The simulated results show that the optimized gating system can realize the sequential solidification

and shrinkage holes are transferred from the ball to the sprue.The simulated results are consistent with the actual casting ones.