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薄板坯连铸结晶器铜板的三维传热分析 总被引:2,自引:0,他引:2
建立了薄板坯连铸结晶器铜板的三维传热数学模型,特别是对结晶器铜板冷面的水槽和背板部分采用了交替配置不同的边界条件处理,利用Visual Fortran语言自编程序计算结晶器铜板温度场.通过对一典型薄板坯连铸结晶器铜板模拟分析,发现铜板热面温度呈现云层分布,冷面温度呈冰柱状分布.分析了各种工艺参数(拉速、铜板厚度、冷却水流速等)对结晶器铜板温度场的影响,典型位置上的计算结果与现场测量数据符合较好,为优化生产工艺参数和结晶器设计提供理论依据和实际参考数据. 相似文献
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建立板坯连铸结晶器三维有限元热弹塑性结构模型,计算铜板等效应力及冷却结构对其影响。研究表明,冷却结构和传热条件决定铜板热面特定力学行为规律,宽面和窄面热面中心线应力分布规律相似,冷却结构尺寸并不改变铜板横截面应力分布的趋势。铜板厚度每增加5 mm,结晶器上部应力仅增大5~7 MPa,而镍层区域变化明显,宽面和窄面最大增幅分别约为60 MPa和50 MPa;镍层每加厚1 mm,宽面和窄面镍层中上部应力提升约20 MPa,而窄面镍层下部应力下降较急剧;当水流量和水温差恒定时,水槽深度增加,热面中心线应力减小,每加深2 mm,结晶器上部下降不足5 MPa,而下部变化较大,最大量达20 MPa。 相似文献
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本文建立了薄板坯连铸结晶器铜板的三维传热数学模型,特别是对结晶器铜板冷面的水槽和背板部分采用了交替配置不同的边界条件处理,利用Visual Fortran语言自编程序计算结晶器铜板温度场。发现结晶器铜板热面温度呈现云层分布,冷面呈现冰凌状分布。分析了各种工艺参数(拉速、铜板厚度、冷却水流速等)对结晶器铜板温度场的影响。典型位置上的计算结果与现场测量数据符合较好,为优化生产工艺参数和结晶器设计提供重要的理论依据和实际参考数据。 相似文献
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角部温度对铸坯质量有较大的影响,建立了直角结晶器、2孔1槽倒角结晶器、3孔倒角结晶器和3孔1槽倒角结晶器铜板温度场的三维稳态数学模型,在相同的边界条件下,模拟分析了这4种结晶器的冷却行为及传热特性。对于不同类型铜板的温度分布数值模拟结果表明,相比于直角结晶器,倒角结晶器铜板角部温度有明显的提高,并且窄面的横向温度分布也与直角不同,呈现"W"形分布。2孔1槽型倒角结晶器窄面铜板比其他类型窄面铜板传热性能好,温度分布均匀,为倒角结晶器窄面铜板的设计提供了理论基础。 相似文献
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Fengming Du Xudong Wang Man Yao Xiaobing Zhang 《Journal of Materials Processing Technology》2014,214(11):2676-2683
A full finite-element model of a mold, including four copper plates, nickel layer and water slots of different depths, was developed to reveal the complex thermal behavior of molds in slab continuous casting. An inverse algorithm was applied to calculate the heat flux and combined with the temperatures measured using thermocouples that were buried in different positions of the mold. The temperature distributions of the four copper plates are not symmetric, reflecting the non-uniform nature of heat transfer and the necessity of building a full model. The maximum hot surface temperature of the mold occurs in the region 70–100 mm below the meniscus. At heights 100 mm below the meniscus, the average temperature of the deep water slot root is higher than that of the shallow water slot by approximately 10 °C. In the off-corner regions, the hot surface temperature differences between the narrow face and wide face near the corners are approximately 20–30 °C 100 mm below the meniscus. It will provide a helpful tool for further improving the casting parameters and operations. 相似文献
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水垢对铜板的导热能力有较大影响,本文利用扫描电镜和X衍射仪对结晶器水冷侧沉积物进行了分析研究,发现沉积物中的元素主要为氧、铜、铁、镍等。结晶器水冷侧表面的沉积物覆盖不均匀,厚度差别较大,沉积物与铜基体的结合非常紧密。为避免结晶器铜板表面出现沉积物,在生产中应严格按照软化水的水质要求,并添加性能满足要求的阻垢缓蚀剂。 相似文献
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The main problems caused by improper gating are entrained aluminum oxide films and entrapped gas. In this study, the slot gating system is employed to improve mold filling behavior and therefore, to improve the quality of aluminum castings produced in permanent molds. An equipment as well as operation procedures for real-time X-ray radiography of molten aluminum flowing into permanent molds have been developed. Graphite molds transparent to X-rays are utilized which make it possible to observe the flow pattern through a number of vertically oriented gating systems. The investigation discovers that there are many influencing factors on the mold filling process. This paper focuses its research on some of the factors, such as the dimensions of the vertical riser and slot thickness, as well as roughness of the coating layer. The results indicate that molten metal can smoothly fill into casting cavity with a proper slot gating system. A bigger vertical riser, proper slot thickness and rougher coating can provide not only a better mold filling pattern, but also hot melt into the top of the cavity. A proper temperature gradient is obtainable, higher at the bottom and lower at the top of the casting cavity, which is in favor of feeding during casting solidification. 相似文献