连铸结晶器中坯壳生长有限元分析

为了预测结晶器出口铸坯坯壳的厚度与均匀性,考虑气隙对连铸坯的边界换热条件的影响,建立了铸坯传热凝固有限元计算分析的数学模型。采用热通量系数法反映实际的坯壳角部凝固特征现象。在方坯结果验证基础上,通过对新型H型连铸坯凝固过程进行模拟,计算得出了结晶器出口处坯壳的厚度。计算结果表明:H型铸坯坯壳的厚度随着拉速的增加而变小;铸坯在腹板和翼板交接处最薄,应适当增加水量,以保证坯壳在结晶器出口处具有足够的厚度。

Finite element analysis of shell growth in a continuous casting mold

The effect of air gaps on the heat transfer at the shell-mold interface was included in finite element model to accurately analyze the heat transfer and solidification to predict the strand shell thickness and uniformity at the mold exit of a continuous casting mold. The heat flux at the corner had to be properly selected to predict the solidification characteristics in the corner of the strand shell. The model accurately predicted the solid shell thickness in a billet and was used to simulate the solidification of a new type H-beam. The results show that faster casting speeds give thinner strand shell thicknesses. The strand shell of the H-beam is thinnest at the joint between the web and the wing so the cooling water flow at that point should be increased to ensure sufficient strand shell thickness at the mold exit.