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以南钢开式水冷模铸机为研究对象,建立了型腔内钢液三维非稳态流动、传热和液面波动的数学模型,研究了浇注过程中钢液的流动特征、温度分布以及注流卷吸气体的运动规律。结果表明:浇注过程中,在“气体卷吸”作用下,型腔内钢液的流动存在显著差异,浇注前期表现为上升流呈多个大小不一的涡旋流,浇注后期则呈典型的逆时针涡旋流,并充满整个模腔。在该流动行为影响下,型腔内钢液温度场表现为中心低四周高的系列等温带,钢液表面水平流速随液面高度的上升而增加,在液面高度为3.1m时达到最大表面流速0.6m/s,此时液面波动大,易发生卷渣和钢液二次氧化。
Taking South Steel open water-cooled die-casting machine as the research object, the mathematical model of three-dimensional unsteady flow, heat transfer and liquid surface fluctuation in molten steel in the cavity was established. The flow characteristics, temperature distribution, Note the law of movement of the suction volume. The results show that there is a significant difference in the flow of molten steel in the cavity under the action of “gas entrainment” during the pouring process. In the early pouring stage, there are multiple swirling flows with different sizes in the ascending stream and in the later pouring period A typical counter-clockwise vortex flows and fills the entire cavity. Under the influence of the flow behavior, the temperature field of the molten steel in the cavity is characterized by a series of isothermal lower central four-week intervals. The horizontal flow velocity of the molten steel increases with the rising of the liquid height and reaches the maximum surface at a liquid height of 3.1 m Flow rate 0.6m / s, when the liquid level fluctuations, prone to volumetric slag and liquid steel secondary oxidation.