圆筒形球铁件铸造工艺的改进江西江州造船厂（瑞昌市３３２２０７）吴天义圆筒形球铁件（如图１所示）在我厂传统的工艺设计中，均遵循顺序凝固原则采用阶梯式浇注系统的立浇方案，往往在冒口与铸件相交处产生严重的缩孔（松）缺陷，冒口重量占铸件的３０％～４０％。后来... Cylindrical ductile iron casting process improvement Jiangxi Jiangzhou Shipyard (Ruichang 332207) Wu Tianyi cylindrical ductile iron pieces (shown in Figure 1) in our traditional process design, are followed by the principle of orderly solidification Ladder pouring system of legislation, often in the riser and casting intersections have a serious crater (loose) defects, riser weight accounted for 30% to 40% of the castings. later...