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结晶器摩擦力对连铸顺行非常重要,而钢液流动行为会影响铸坯温度场和保护渣分布,可能对铸坯摩擦力产生一定的影响。利用Fluent软件建立结晶器内钢液流动、传热三维数学模型,并将温度场数据导入Ansys计算铸坯应变,然后根据铸坯-保护渣-结晶器摩擦行为数学模型讨论了渣膜润滑情况,对比了不同水口底部形状下结晶器内液态、固态和总摩擦力。结果表明:不考虑水口射流时结晶器总摩擦力比考虑水口时增大约29.4%;浸入式水口底部形状分别为凸底、平底和凹底3种情况下铸坯窄面中心温度依次降低,凝固壳厚度依次增大,固态摩擦力依次增大,总摩擦力依次增大,液态摩擦力相差较小。
Mold friction is very important for continuous casting, and the flow behavior of molten steel affects the temperature distribution of the billet and the distribution of the mold flux, which may have an impact on the friction of the billet. Fluent software was used to establish the three-dimensional mathematical model of the flow and heat transfer in the mold. The temperature field data was imported into Ansys to calculate the slab strain. Then the lubrication of the slag film was discussed according to the mathematical model of the slab-mold flux- The liquid, solid and total friction in the mold under different shapes of bottom of nozzle were compared. The results show that the total friction of the mold increases by about 29.4% compared with the nozzle without considering the nozzle jet flow. The center of the narrow surface of the mold decreases in turn after the bottom shape of the immersion nozzle is convex, flat and concave. The shell thickness increases in turn, the solid friction increases in turn, the total friction increases in turn, the liquid friction difference is small.