客车轴箱铸件在凝固过程中的缺陷预测

Prediction of the Defects Appearing in the Casting of Train'sAxis Box

客车轴箱在铸造过程中容易产生缩松,气孔等缺陷,运用计算机模拟技术对轴箱在浇注充型过程和随后的冷却过程进行了模拟。通过对固相分数、凝固时间和二次枝晶臂距大小分布的分析,可以看出在充型过程和随后的冷却过程,在轴箱的上部和前端靠近直浇道侧容易产生缩松并且二次枝晶臂距较为粗大。利用模拟的结果与实际铸件进行对比,发现模拟结果与实际吻合较好。

It is easy to bring about the micropores and pores in the casting axis box. With the computer simulation technique, the feeding process and the following cooling process are simulated. Through the analyzing of the simulated results of the solid fraction, solidification time and second dendrite arm spacing, it is found that, in the upper side and the right side of axis box, it is easy to cause the pores and the second dendrite arm spacing is also easily to grow coarser than those in other places. Compared the simulated results with the practical casting results, the simulated results are according with the practical casting results well.