On the basis of the technical requirements of grinding discs, a ductile iron grinding disc was produced via various casting processes, such as no riser, an open riser and a closed riser with an exothermic feeder sleeve and a shell + iron mold combined with an exothermic feeder sleeve. The results show that neither the process method without risers nor the process methods with open risers or closed risers can eliminate the shrinkage porosity defects on the surface and inside of the ductile iron grinding disc. The shell mold + iron mold process combined with an exothermic feeder sleeve can effectively eliminate shrinkage porosity defects both on the surface and inside the grinding plate. The grinding plate has a smooth processing surface and hardness of 161~165 HB after tempering, which can meet the technical requirements for the use of the grinding plate.