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1·From the chemical composition, trace element, inoculation and thermal exchange of metal mold casting, the principle of chill formation and the effective methods for preventing chill were studied.

文章从铸铁的化学成分、微量元素、孕育处理及金属型的热交换方面叙述了产生白口的原理及防白口的有效方法。

2·Based on determining of mold joint, the thesis finished the structure optimization design of chill, and introduced the process of optimization in detail.

在分型面确定的基础上，完成了凸轮轴铸件相应冷铁的结构优化设计，并详细的介绍了其优化过程。

3·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。

4·If the compacted treatment degree and chill capacity of chiller are not enough to obtain fine spheroidal graphite layer, the service life of glass mold is short.

如果蠕化处理程度和冷铁激冷能力无法形成球墨层者，使用效果较差。