金属包覆材料固-液复合结晶器传热分析与参数优化

Heat transfer analysis and parameter optimization of solid-liquid bonding mold for metal cladding materials

金属包覆材料多辊固-液铸轧复合工艺兼具多辊轧制技术与铸轧复合技术双重优势,有望实现高效率、短流程、低能耗的连续近终成形与界面冶金结合。多辊固-液铸轧复合设备的结晶器担负着水冷和轧制的双重作用,直接影响覆层金属的凝固和变形行为,通过设计孔型铸轧辊结构方案,基于FLUENT软件建立孔型铸轧辊稳态温度场分析模型,研究结构参数和工艺参数对温度分布的影响规律。结果表明,非冷却区宽度对孔型铸轧辊冷却能力影响较小,参数设计时以满足铸轧辊强度要求为准,而提高冷却区宽度、对流换热系数和降低冷却水温度有利于提高孔型铸轧辊冷却能力。基于数值模拟结果获得优化结构参数,辊套名义直径为250 mm、内径为180 mm、宽度为50 mm,孔型直径为25 mm,冷却区宽度为25 mm,完成金属包覆材料多辊固-液铸轧复合原理样机设计制造,为后续开展试验研究奠定了平台基础。

The multi-roll solid-liquid cast-rolling bonding technology of metal cladding materials has the advantages of both multi-roll rolling technology and cast-rolling bonding technology,which is expected to realize the combination of continuous near-final forming and interfacial metallurgical bonding with high efficiency,short flow,and low energy consumption.The mold of the multi-roll solid-liquid casting-rolling bonding equipment has the dual functions of water cooling and rolling,which directly affects the solidification and deformation behaviors of the cladding metal.By designing the structure scheme of the grooved casting roll,the steady state temperature field analysis model of the grooved casting roll was established based on the FLUENT software,and the influence of the structural parameters and process parameters on the temperature distribution was revealed.The analysis results show that the width of the non-cooling area has little effect on the cooling capacity of the grooved casting roll,and the parameters are designed to meet the strength requirements of the casting roller.Besides,increasing the width of the cooling area and convective heat transfer coefficient,and reducing the cooling water temperature are conducive to improving the cooling capacity of the grooved casting roll.The optimized structural parameters were obtained based on the numerical simulation results,with a roller nominal radius of 250 mm,inner diameter of 180 mm,width of 50 mm,and groove diameter of 25 mm,and cooling zone width of 25 mm.Finally,the design and manufacture of the multi-roll solid-liquid cast-rolling bonding prototype for metal cladding materials were completed,which laid a platform for the subsequent experimental research.