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.
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.