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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 3    June 2005

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Development and application of coupling model of aluminum thin-gauge high-speed casting
LIU Xiao-bo(刘晓波)1, MAO Da-heng(毛大恒)2,  ZHONG Jue(钟 掘)2

1. College of Mechanical and Electronic Engineering, 
Jiangxi University of Science and Technology, Ganzhou 341000, China;
 2. School of Mechanical and Electrical Engineering, Central South University, 
Changsha 410083, China

Abstract:Based on the analyses of aluminum melt flow, solidification, heat transfer during the process of  twin-roll casting, a coupling mathematical model of aluminum thin-gauge high-speed casting was developed, which included the casting roller shell. At the same time, Galerkin method was adopted to solve the coupling model. The fluid field and temperature field of aluminum melt in casting zone, the temperature field and thermal stress field of roller shells were simulated by the coupling model. When the casting velocity is 7m/min, and the thickness  of strip is 2mm, the circumfluent area comes into being in the casting zone, and the mushy zone dominates the casting zone, while the temperature of melt decreases rapidly as it approaches the rollers. The temperature of the roller shell varies periodically with the rotation of roller, and reaches the highest temperature in the casting zone, while the temperature of roller shell decreases gradually as it leaves  the casting zone. The difference of thermal stress between the inner surface and outer surface of the roller shell is very large, and the outer surface suffers tensile-compressive stress.

 

Key words: Thin-gauge high-speed casting; flow field; temperature filed; stress field; coupling model

ISSN 1672-7029
CN 43-1423/U

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