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针对大型铸钢件旋回破碎机横梁在铸造生产过程中存在的缺陷问题,利用Pro CAST模拟软件,对特大型旋回破碎机横梁铸件进行了凝固过程的数值模拟,分析了横梁纵向剖面8个关键位置的温度变化曲线,归纳出冷却速率的变化趋势。同时根据Niyama判据预测铸件中产生缺陷的位置。在此基础上,对原铸造工艺方案进行改进,即在发热冒口的底部添设补贴。经过模拟结果对比表明:改进后的工艺有效的增加了冒口补缩距离,Niyama判据满足不形成缩松缩孔的临界值要求。避免了在铸造时缩松缩孔缺陷的产生。模拟实验结果与实际生产相符。
Aiming at the defects of the large-scale steel-framed gyratory crusher beam during the casting process, the numerical simulation of the solidification process was carried out by using Pro CAST simulation software. The 8 critical positions of the longitudinal cross-section of the beam were analyzed. Of the temperature curve, summed up the trend of the cooling rate. At the same time, Niyama criterion is used to predict the location of defects in the castings. On this basis, the original casting process program to improve, that is, in the bottom of the heating riser subsidies. The comparison of simulation results shows that the improved process effectively increases the feeder riser distance, and the Niyama criterion satisfies the critical value of shrinkage shrinkage without shrinkage. Avoids shrinkage shrinkage defects during casting. The simulation results are consistent with the actual production.