Subsequently it is reliable for the proportional solidification theory to design feeding system of ring carrier casting of nodular iron.
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。
Experiments indicates that the harrow piece of nodular cast iron in squeezing casting has the features of excellent mechanical properties and low production cost.
经试验，挤压铸造的球墨铸铁耙片力学性能好，生产成本低。
The self-compensated contraction caused by graphite dilatation in the solidification process of nodular cast iron makes casting with less flow-off or casting without flow-off possible.
利用球墨铸铁凝固过程中的石墨化膨胀，进行自身补缩，可以实现少胃口或无冒口铸造。
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