Large thick-section ductile Iron housing easily produces casting defects such as shrinkage cavity, shrinkage porosity, graphite floating and spheroidizing decay.

大型厚断面球墨铸铁件在铸造过程中极易产生缩孔、缩松、石墨漂浮及球化衰退等铸造缺陷。

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The casting technique with top gating system, outer shaped iron chill, compound casting mold and core assembly molding was used for producing aluminum impeller on a large scale successfully.

详细介绍了采取顶注式浇注系统、成形外冷铁、复合铸型、组芯造型的铸造工艺，成功地生产出批量铝叶轮。

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The factors which have an effect on the formation of a kind of defect called "iron thorn"on the large area of casting are discussed, and process parameters are presented for the process improvement.

根据铸件大面积铁刺缺陷的技术攻关，论述了造成铸件缺陷的影响因素，制定一套可行的工艺参数，对改进工艺参数有一定参考作用。

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