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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： 本文使用了收縮膨脹動態曡加（DECAM）法，對球鉄輪轂的縮孔形成進行了模擬和工藝改進。