Using thin, wide ingate and chill can prevent the shrinkage defect, and improve casting yield by 3%.

采用薄、宽的内浇道和冷铁工艺消除了飞轮铸件的缩孔缺陷，铸造工艺出品率提高3%；

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Since contraction of nodular iron is bigger than its expansion nodular iron castings must be fed from outside to prevent shrinkage defect.

由于球铁的收缩大于膨胀，球铁件铸造必需外部补缩。

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The numerical simulation of temperature field and shrinkage defect prediction for a valve casting, which was involved in 4 kinds of casting proces.

对采用4种不同铸造工艺方案的阀体铸件凝固过程进行了数值模拟及缺陷预测，获得了与试验相一致的模拟结果。

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