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根据某钢厂的铸机条件,建立了连铸大方坯的二维温度与热应变耦合模型,采用有限元法对数学模型进行求解,获得了不同拉速和过热度下铸坯的温度场和凝固收缩规律。结果表明:拉速对热收缩影响显著,过热度影响小,在制定辊缝工艺制度时可以忽略过热度的影响;铸坯表面温度变化越剧烈,热收缩的趋势越大,热收缩量也越大;辊缝工艺可分为四段分别线性控制,而且沿拉坯方向,辊缝线性减少速率逐渐减小。
According to the casting conditions of a steel mill, a two-dimensional temperature and thermal strain coupling model of continuous casting bloom was established. The mathematical model was solved by finite element method. The temperature field and Solidification shrinkage law. The results show that the pulling speed has a significant influence on the heat shrinkage and the effect of superheat is small. The influence of superheat can be neglected in the process of formulating the roll gap process. The more severe the surface temperature changes, the greater the shrinkage tendency and the more the heat shrinkage Large; roll seam process can be divided into four sections were linear control, and along the direction of casting, roll linear reduction rate decreases.