A ductile iron casting was taken as an exaple to show how should properly design feeder and utilize chills to realize proportional solidification and prevent shrinkage defect.

• 结合铸件实例,说明合理设计冒口和利用冷铁使球铁铸件实现均衡凝固,防止缩孔、缩松的工艺方法。