浇注了一系列的球墨铸铁件，解剖铸件，测定铸件缩孔体积。对铸件开展了凝固过程三维温度场数值模拟，并应用Ｇ／Ｒ法对铸件进行了缩孔缩松预测。结果表明，空间步长、时间步长、计算Ｇ／Ｒ值的评价温度以及判断缩孔缩松的临界值均影响Ｇ／Ｒ值，从而影响缩孔缩松预测的准确程度，Ｇ／Ｒ法不适用于球墨铸铁件缩孔缩松的预测。 Cast a series of ductile iron castings, anatomical castings, casting shrinkage volume determination. The three-dimensional temperature field of the solidification process was numerically simulated and the shrinkage porosity was predicted by G / R method. The results show that the spatial step size, the time step, the evaluation of the G / R value and the critical value of shrinkage shrinkage all affect the G / R value, which affects the accuracy of shrinkage prediction. The G / R method Not suitable for prediction of shrinkage shrinkage of ductile iron.