180 mm×180 mm方坯连铸二冷工艺模型研究

Study on secondary cooling model for 180 mm×180 mm billet in the process of continuous casting

二冷工艺模型对连铸过程铸坯质量的控制至关重要。某厂180mm断面方坯连铸机欠缺比较精细的二冷工艺控制模型,不利于铸坯质量的提升。针对该连铸机,综合考虑拉速v(m/min)以及浇铸过热度ΔT(℃)对二次冷却区各段冷却水量的影响,确定了较为先进的二冷工艺模型,并结合离线仿真研究,确定了模型中系数a、b、c和d的合理取值,并且系数d的取值和拉速有关。仿真结果满足冶金准则的要求,铸坯可以得到均匀冷却,表明确定的二冷工艺模型有利于铸坯质量的提升。

The secondary cooling process control model is very important for the control of the quality of the billet in the continuous casting process,a 180 mm billet caster lacks more refined secondary cooling process control model,which is not conducive to the improvement of the billet quality. For the caster,this paper comprehensively considers the influence of the casting speed v(m/min)and the superheat ΔT(℃)on the cooling water volume of each section in the secondary cooling zone,and determines a more advanced secondary cooling control model,then combining with the offline simulation research,the reasonable values of a、b、c、d in the model are determined,and the value of d is related to the casting speed. The simulation results meet the requirements of the metallurgical criteria,and the billet could achieve uniform cooling,which indicate that the determined secondary cooling process model is conducive to the improvement of the quality of the billet.