铝合金连续铸轧过程直接热-力耦合数值模拟研究  

Study on Numerical Simulation of Thermal-stress Direct-coupling in Twin-roll Continuous Casting of Aluminum Alloys

作　　者：苏基协[1] 李晓谦[1] 马维策[1] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083

出　　处：《上海有色金属》2008年第3期102-108,共7页Shanghai Nonferrous Metals

基　　金：国家"973"项目(1999064906)

摘　　要：基于大型有限元模拟软件MSC.Marc建立了连续铸轧过程的热-力耦合模型,应用材料流变本构模型和辊/板界面接触热导模型,对铝合金的连续铸轧过程进行了二维的直接热-力耦合数值模拟,分析了连续铸轧过程中辊套及板坯的温度场、应力场的分布规律,研究了不同的铸轧工艺下的板坯温度场、应力场变化的规律。研究发现:在铸轧过程中,辊套的温度分布、应力分布均存在所谓的"集肤效应",板坯在铸轧区内的应力场与板坯物性因素、几何因素及温度、铸轧工艺等有密切的联系,仿真的结果与大量的工业现象相符,在一定程度上可以为实际生产提供技术指导。Based on the large finite element software MSC. Mare, the thermal-stress coupling model of twin-roll continuous casting process was established in this paper. The two-dimensional thermal-stress coupling of twin-roll continuous casting has been molded using material rheologic constitutive model and the interface thermal contact conductance model between roller and casting blank. The temperature field and stress field of roller and casting blank during the casting have been analyzed, and the changing law of temperature and stress fields of casting blank at different casting velocities, thicknesses of casting blank and coefficient of heat conductivity were studied in this paper. It was found out that the so-called skin effect appeared in the temperature and stress distribution during the casting. The stress field of the casting blank in the rolling zone has a close relation with the physical and geometrical factors of the blank, its temperature and the casting process. The simulation results matched with the phenomena of the commercial production, which can help offer technological guidance in the commercial production to a certain extent.

关 键 词：铝合金 连续铸轧 热-力耦合 数值模拟 

分 类 号：TG335[金属学及工艺—金属压力加工]