摘要
采用ANSYS FLUENT对双辊铸轧1100铝合金Hunter式铸嘴进行有限元模拟,研究铸嘴型腔结构对铝熔体流热场的影响,并对铸嘴结构进行改进边部挡块、增加主分流块尺寸以及增加圆角的模拟优化设计及实验验证。结果表明:在660~700℃内,铝熔体黏度η与温度T的数学关系式为η=4.7892×10^(-3)exp(3959.4208/T)。优化前铸嘴型腔内铝熔体流速、温度分布不均匀,且分流块间隙存在低温涡流区。采取四分之一椭圆边部挡块代替原有三角边部挡块,主分流块尺寸由140 mm增加至160 mm以及主分流块采取15°圆角,可使铸嘴型腔出口处铝熔体速度和温度波动范围显著缩小,提高铸嘴型腔出口处铝熔体流热场的均匀性。实验验证了铸嘴结构优化设计的可行性。
ANSYS FLUENT was used to carry out finite element simulation on Hunter nozzle of twin-roll casting and rolling of 1100 aluminum alloy.The influence of nozzle cavity structure on aluminum melt flow heat field was studied,the simulation optimization design and experimental verification of nozzle structure were carried out by improving edge stop,increasing the size of main splitter block and increasing fillet.The research results show that the mathematical relationship between aluminum melt viscosityηand temperature T in the temperature range of 660—700℃isη=4.7892×10^(-3)exp(3959.4208/T).Before optimization,the flow rate and temperature distribution of aluminum melt in the nozzle cavity are not uniform,and there is a low temperature eddy current zone in the gap between the diverter blocks.A quarter elliptical edge block is adopted to replace the original triangular edge block,the size of the main shunt block is increased from 140 mm to 160 mm,and the main shunt block was rounded at 15°.The aluminum melt flow rate at the edge of the nozzle is reduced from 0.066 m/s before optimization to 0.052 m/s,and the melt flow rate and temperature distribution in the nozzle cavity and outlet are relatively uniform.The feasibility of structural optimization design of casting nozzle was verified by experiments.
作者
丁万武
石怀鑫
魏振鹏
鲁维东
张开宝
刘建兴
雷东楷
DING Wanwu;SHI Huaixin;WEI Zhenpeng;LU Weidong;ZHANG Kaibao;LIU Jianxing;LEI Dongkai(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Jiuquan Iron and Steel(Group)Corporation,Jiayuguan 735100,China)
出处
《有色金属工程》
CAS
北大核心
2022年第9期16-24,共9页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(52161006)
甘肃省教育厅产业支持计划项目(2021CYZC-23)
甘肃省重点研发计划项目(21YF5GD183)
嘉峪关科技计划项目(21-10)
中国博士后科学基金项目(2019M653896XB)。
关键词
双辊铸轧
1100铝合金
铸嘴结构
有限元模拟
流热场
twin roll casting
1100 aluminium alloy
casting nozzle structure
finite element simulation
fluid-thermal field
