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基于热量平衡原理建立了大方坯连铸过程的传热数学模型,通过对二冷区的分段和联立方程组求解,可以快速获得二冷区指定位置铸坯的坯壳厚度、表面温度、凝固潜热、散热等热状态参数。以某钢厂的大方坯连铸机生产45号钢为研究背景的数值模拟和现场测温表明,铸坯断面尺寸为260mm×340mm,铸机拉速为0.5m/min、0.6m/min时,模型的计算结果符合凝固规律,计算温度与实测温度的误差小于2%,计算结果可为大方坯动态轻压下工艺的优化提供可靠的依据。
Based on the principle of heat balance, the mathematical model of heat transfer in the continuous casting process of bloom is established. By means of the subsection and simultaneous equations of the second cooling zone, the shell thickness, surface temperature, Solidification latent heat, heat and other thermal parameters. The numerical simulation and on-site temperature measurement of 45 # steel produced by bloom caster in a steel mill show that the cross section size of the slab is 260mm × 340mm, the casting machine pulling speed is 0.5m / min and 0.6m / min The calculated results accord with the law of solidification. The error between the calculated temperature and the measured temperature is less than 2%. The calculation results can provide a reliable basis for the optimization of the process of dynamic mild reduction of bloom.