论文部分内容阅读
建立描述环缝式电磁连铸A357铝合金圆坯过程的数学模型,采用有限元法求解电磁场,采用有限体积法求解流场和温度场,并对电磁场和温度场的计算结果进行实验验证,分析环缝宽度、环缝位置和芯棒长度等结构参数对环缝式电磁连铸过程流场、温度场和凝固过程的影响。结果表明:环缝宽度越小,液穴中的温度梯度越小,温度场越均匀;随着芯棒长度的增加,由于芯棒的错位液穴内的循环流减小,温度梯度变大;当环缝位于铸坯边沿时,液穴中的温度梯度降低明显。
A mathematic model describing the process of circular casting of A357 aluminum alloy round billet was established. The finite element method was used to solve the electromagnetic field. The finite volume method was used to solve the flow field and the temperature field. The experimental results of electromagnetic field and temperature field were validated. The influence of the structural parameters such as the width of the annular gap, the position of the annular gap and the length of the mandrel on the flow field, temperature field and solidification process during the ring-seam electromagnetic continuous casting process. The results show that the smaller the annular gap width is, the smaller the temperature gradient in the liquid cavity is and the more uniform the temperature field. As the length of the mandrel increases, the temperature gradient increases due to the decrease of the circulating flow in the mandrel bar. When the ring seam is located at the edge of the slab, the temperature gradient in the liquid hole decreases obviously.