This paper deals with secondary cooling in a continuous caster. In particular, it deals with cooling inhomogeneity caused by spray arrangement and segmented rolls used for leading the strand. The cooling section is placed under the mold. Segmented rolls are supported by bearings in several places across the strand. Sprayed water can flow in the gaps between rolls where the bearing pocket is located. The main question that was experimentally studied is how this geometry with segmented rolls can influence homogeneity of cooling. Two experimental approaches developed for this study were applied, and both used full-scale geometrical configuration. The first one was a cold test where water flow and water distribution were observed using a transparent board with the studied surface structures (rollers and bearing pockets) and four spraying nozzles. The second one was a cooling test using a heated steel plate with rolls and bearing pockets. Cooling homogeneity was studied based on the temperature distribution on the rear side of the sample, which was recorded using an infrared camera. Homogeneity of cooling distribution was experimentally studied for three levels of cooling intensity that are used in typical cooling sections in plants. The hot tests showed that the bearing pockets do not provide significant cooling inhomogeneity despite the fact that a large amount of water flows through the gap between the rollers (which has been observed in cold tests).

中文翻译：

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分段轧辊对连铸冷却均匀性的影响

本文涉及连铸机中的二次冷却。特别是，它处理了由喷射布置和用于引导铸流的分段辊引起的冷却不均匀性。冷却部分放置在模具下方。分段轧辊在整个钢绞线的多个位置由轴承支撑。喷出的水可以在轴承座所在的辊之间的间隙中流动。实验研究的主要问题是这种具有分段辊的几何形状如何影响冷却的均匀性。应用了为本研究开发的两种实验方法，并且都使用了全尺寸几何配置。第一个是冷测试，其中使用具有研究的表面结构（辊子和轴承座）和四个喷嘴的透明板观察水流和水分布。第二个是使用带有辊子和轴承座的加热钢板进行的冷却测试。根据样品背面的温度分布研究冷却均匀性，该分布使用红外摄像机记录。针对工厂典型冷却段中使用的三个冷却强度级别，对冷却分布的均匀性进行了实验研究。热测试表明，尽管大量水流过滚子之间的间隙（在冷测试中已观察到），但轴承座并未提供明显的冷却不均匀性。针对工厂典型冷却段中使用的三个冷却强度级别，对冷却分布的均匀性进行了实验研究。热测试表明，尽管大量水流过滚子之间的间隙（在冷测试中已观察到），但轴承座并未提供明显的冷却不均匀性。针对工厂典型冷却段中使用的三个冷却强度级别，对冷却分布的均匀性进行了实验研究。热测试表明，尽管大量水流过滚子之间的间隙（在冷测试中已观察到），但轴承座并未提供明显的冷却不均匀性。