铸嘴结构对3004铝合金铸轧流热场的影响及其优化设计

发布时间：2018-02-04 13:52

  本文关键词： 铝合金 黏度 铸嘴 有限元模拟 流热场　出处：《中南大学学报(自然科学版)》2015年05期 　论文类型：期刊论文

【摘要】：针对3004铝合金铸轧生产中熔体流动性差、铸嘴布流困难、易造成板面缺陷的现象,采用高温熔体黏度测量仪对3004铝合金熔体黏度进行测量,根据实测物理参数与生产工况,采用COMSOL Multiphysics软件对熔体在2种不同结构铸嘴中的流热场进行有限元模拟分析,根据模拟结果对铸嘴结构进行优化设计与实验检测。研究结果表明:在660~750℃范围内其黏度μ与温度θ的关系可表达为μ=10-3×exp(0.059+621.379/θ);当铸嘴入口2边的挡块与水平方向成8°倾斜角,挡块与分流块间间距为30 mm时,铸嘴型腔内容易产生涡流,流热场分布不均匀;当铸嘴入口2边挡块水平设置,挡块与分流块间间距为50 mm时,熔体流动平缓,流热场分布较均匀。实验验证了模拟结果的准确性与优化方案的可行性。
[Abstract]:Aiming at the phenomenon that the melt fluidity of 3004 aluminum alloy is poor, the flow of casting nozzle is difficult, and the plate surface defect is easy to be caused, the melt viscosity of 3004 aluminum alloy is measured by high temperature melt viscosity measuring instrument. According to the measured physical parameters and production conditions, the flow and heat field of melt in two different structure nozzles was simulated and analyzed by COMSOL Multiphysics software. According to the simulation results, the optimum design and experimental test of the nozzle structure are carried out. The results show that the relationship between the viscosity 渭 and the temperature 胃 can be expressed as 渭 10 ~ (-3) 脳 exp. in the range of 660 ~ 750 鈩，

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