依据研磨盘的技术要求，采取无冒口、明发热冒口、暗发热冒口和壳型+铁模+发热冒口等铸造工艺方法试 制了球墨铸铁研磨盘。结果表明，无冒口、明发热冒口和暗发热冒口的工艺方法均无法消除球墨铸铁研磨盘表面及内部 的缩松缺陷。而壳型+铁模配合发热冒口设置的工艺方法可有效消除球墨铸铁研磨盘表面及内部的缩松缺陷，研磨盘加 工表面光洁，退火后硬度161~165HB，满足研磨盘使用的技术要求。

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.