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针对120mm球墨铸铁磨球的金属型铸造工艺,采用有限差分的方法,利用自主开发的模拟软件对磨球的凝固过程进行了温度场的数值模拟,预测了铸件在铸造中可能产生的缺陷位置,并对磨球内部产生缩孔的原因进行了分析。通过增加砂套,缩短内浇道,减小直浇道尺寸等对浇注系统进行了修改和优化,并对优化后的浇注系统进行了温度场的数值模拟。结果表明,优化后的浇注系统实现了顺序凝固,缩孔缺陷从磨球内部转移到了直浇道内,模拟结果与实际浇注结果相符合。
Aiming at the metal casting process of 120mm ductile iron ball, the finite difference method is used to simulate the temperature field during the solidification process of the ball by using the self-developed simulation software to predict the possible defects in the casting , And the reasons for the shrinkage of the balls were analyzed. The gating system was modified and optimized by adding sands, shortening the runner and decreasing the size of the sprue. The temperature field of the optimized gating system was numerically simulated. The results show that the optimized pouring system realizes the orderly solidification, and the shrinkage defects are transferred from the inside of the ball to the sprue. The simulation results are consistent with the actual pouring results.