首先，对“裸件”（无任何浇注或补缩系统）进行模拟。
This process involves running an initial simulation on a 'naked' casting, that is, a part without any gating or feeding system.
实际证明：采用均衡凝固理论设计球铁圈形铸件的补缩系统是可靠的。
Subsequently it is reliable for the proportional solidification theory to design feeding system of ring carrier casting of nodular iron.
本文还对该浇冒口系统提高补缩效果的原因进行了初步分析。
The cause of the effect of shrinkage improvement in this pouring system is also analysed.
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