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通过建立19 t大钢锭充型过程的流动和传热模型,研究大钢锭充型初期的流场和温度场分布特征,针对一系列不同尺寸结构模底砖的钢锭模进行充型过程的数值模拟,研究模底砖结构对充型初期钢液面卷渣的影响.充型初期钢液面波动大,且凝固层推进快,易发生卷渣并被捕获至坯壳.当模底砖下口直径小于上口直径时,钢液进入钢锭模的流速主要取决于模底砖下口直径,并随着下口直径的增大而迅速减小.对于19 t钢锭,当模底砖下口直径大于90 mm后能在很大程度上减小充型初期的卷渣概率.
Through the establishment of flow and heat transfer model in the process of 19 t ingot filling, the distribution characteristics of flow field and temperature field in the initial filling stage of the ingot are studied. The numerical simulation of the filling process of ingot mold in a series of mold halves with different sizes , The effect of mold base brick structure on the volumetric steel slag in the initial stage of filling was studied.The liquid steel surface fluctuated greatly in the initial stage of filling and the solidified layer advanced fast, When the diameter is smaller than the diameter of the upper opening, the flow rate of molten steel into the ingot mold mainly depends on the diameter of the bottom opening of the mold bottom brick, and decreases rapidly with the diameter of the lower opening.For 19 t ingot, Greater than 90 mm can greatly reduce the probability of initial filling slag.