球墨铸铁的固体收缩和普通灰铸铁相差无几,可以利用原来作灰铸铁用的木模,除非铸件极大或铸件尺寸需要特别准确的情形,一般不需要另制木模;但是球墨铸铁的液体收缩较灰铸铁要大,如果对浇冒口没有好好的设计按放,则铸件某些部分可能会发生缩孔或缩松。 The solid shrinkage of ductile cast iron is almost the same as that of ordinary gray cast iron. The wood mold originally used for gray cast iron can be used. Unless the castings are extremely large or the casting size needs to be particularly accurate, no separate wooden molds are generally needed; however, the liquid shrinkage of the ductile iron Larger than the gray cast iron, if the design is not good on the pouring riser, castings may occur in some parts shrinkage or shrinkage.