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根据某厂的1 300 mm×230 mm大板坯结晶器生产情况,利用相似原理,采用1:2的物理模型,通过波高检测研究了水口底部形状、水口浸入深度及拉速对结晶器液面波动的影响,同时通过卷渣试验中的卷渣趋势来寻找较优流场。试验结果表明:在水口浸入深度为180~260 mm范围内,使用凸底水口优于凹底水口,液面波动随着拉速的增加而增加,随着水口浸入深度的增加而降低。当拉速为1.1~1.3 m/min,浸入深度为220~260 mm时,液面波动为±4 mm左右,无卷渣产生。
According to the production of 1 300 mm × 230 mm large slab mold in a factory, the shape of the bottom of the nozzle, the depth of immersion and the speed of pulling on the crystallizer level were studied by using the similar principle and the physical model of 1: 2. At the same time, we can find the optimal flow field by the trend of entrainment in the entrapment test. The results show that when the immersion depth is in the range of 180-260 mm, the use of convex bottom outlet is better than that of concave bottom outlet. Fluctuation of liquid surface increases with the increase of extrusion rate and decreases with the increase of immersion depth. When the pulling speed is 1.1 ~ 1.3 m / min and the immersion depth is 220 ~ 260 mm, the fluctuation of liquid level is about ± 4 mm.