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Study on mechanism of mould powder entrapment in funnel type mould of flexible thin slab casting machine

机译：柔性薄板坯连铸机漏斗形结晶器中结晶器渣的截留机理研究

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摘要

A physical model was established to study the mechanism of mould powder entrapment in the funnel type mould of a flexible thin slab casting machine, and the effects of operational parameters on the powder entrapment were investigated. The results show that there are three mechanisms of mould powder entrapment, vis-a-vis entrapment caused by shear stress, entrapment caused by vortex and entrapment caused by shear stress and vortex. Three different modes of the entrapment caused by the shear stress, between the mould powder and the molten steel flow produced by the flow from the upper ports of a four-port submerged entry nozzle, were observed. The entrapment caused by vortex occurs at the lowest position of the metal/slag interface. The entrapment caused by shear stress and vortex is a new mechanism, in which the powder is firstly drawn downward by shear stress and then pulls the powder layers above under the common action of shear stress and vortex.
机译：建立了物理模型，研究了柔性薄板坯连铸机漏斗形结晶器中结晶器粉末的截留机理，并研究了操作参数对结晶器截留粉末的影响。结果表明，结晶器保护渣存在三种机理：剪切应力引起的逐层截留，涡旋引起的截留，剪切应力和涡旋引起的截留。观察到了由切应力引起的三种不同的截留模式，即在结晶器保护渣和由四通浸入式水口的上口流产生的钢水流之间。由涡流引起的夹带发生在金属/炉渣界面的最低位置。剪切应力和涡流引起的夹带是一种新的机理，在这种机制中，首先通过剪切应力将粉末向下拉，然后在剪切应力和涡流的共同作用下将粉末层拉到上方。

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