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研究了模铸过程中气隙的产生、分布规律．数学模型包括两部分：１）计算纯金属凝固传热；２）计算金属冷却收缩．经计算得到，同一点不同时间气隙的变化规律是：首先逐步形成较宽的气隙，而后变窄，完全凝固后气隙才再次变宽；同一时间气隙的变化规律是：离角部的距离越大，气隙越窄，离角部的距离越小，气隙越宽．经实验验证，模型成立．
The formation and distribution of air gap in the process of die casting were studied. The mathematical model consists of two parts: 1) calculate the solidification heat transfer of pure metal; 2) calculate the metal cooling shrinkage. The calculated variation of the air gap at the same time and at different times is as follows: Firstly, a wider air gap is formed gradually and then becomes narrower, and then the air gap becomes wider again after being completely solidified; at the same time, the variation law of the air gap is: The larger the distance, the narrower the air gap, the smaller the distance from the corner, and the wider the air gap. After experimental verification, the model is established.