对数控机床球铁立柱件的结构及铸造关键工艺进行综合分析,针对其壁厚不均,厚大部位外部和中心部位的凝固次序差异大,易产生缩松、缩孔和内在质量要求高等一系列问题,采用半封闭的底注式系统,并增加冷铁、溢流等工艺措施,有效地防止了铸件缩孔、缩松等缺陷的产生。生产出合格的球铁铸件,为生产高质量机床球铁铸件产品积累了丰富经验。 Based on the analysis of the structure of key column of CNC machine tool and the key technology of casting, according to the uneven wall thickness, the order of the solidification in the outer part and the center part of the thick part is big, easy to produce the shrinkage, shrinkage cavity and inner quality. Series of problems, the use of semi-closed-end injection system, and increase cold iron, overflow and other process measures, effectively preventing the casting shrinkage, shrinkage and other defects. Produced qualified ductile iron castings, for the production of high quality ductile iron castings products has accumulated rich experience.