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Abstract： In the paper,shrinkage cavity formation of a hub S.G.iron casting was simulated with DECAM(Dynamic Expansion and Contrac tion Accumulation Method). 摘 要： 本文使用了收缩膨胀动态叠加（DECAM）法，对球铁轮毂的缩孔形成进行了模拟和工艺改进。