高速线材穿水冷却过程的有限元模拟与分析  

Finite element simulation and analysis of high-speed wire rods during through-water cooling

作　　者：张庆峰[1] 金峰[1] ZHANG Qing-feng;JIN Feng(Central Research Institute,Baoshan Iron and Steel Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]宝山钢铁股份有限公司中央研究院,上海201900

出　　处：《轧钢》2020年第5期39-43,共5页Steel Rolling

摘　　要：高线水冷箱的冷却能力、冷却均匀性、稳定性直接影响控轧效果,是线材控冷的主要控制手段。由于现场测温点安装位置距离水冷箱出口较远,其实测结果不能直接评价水冷箱冷却效果,因此建立了高速线材水冷计算模型,并采用实测轧件温度的方法验证了模型的可靠性;分析了4种不同冷却工艺对Ф7mm 86LX帘线钢线材冷却温降、芯表温差、返红温度的影响。结果表明,减定径入口线材芯表温差随冷却水量的增加而增大,且在冷却水量小于200m^3/h时增加的幅度更为明显;不同冷却工艺下Ф7mm 86LX线材芯表温差在40~131℃之间,冷却过度是线材表面形成细晶组织的原因;通过降低轧制速度和减小冷却水量可改善减定径轧制阶段线材温度的均匀性。The water cooling capacity,cooling uniformity and stability of wire rods directly affect the controlled rolling effect,which is the main control means of wire controlled cooling.Since the installation location of temperature measuring is far from the outlet of the water cooling,the measured temperature results cannot directly evaluate the cooling effect.Therefore,a water-cooling model for the high-speed wire rod was built,and the reliability of the model was verified by the measured temperature of piece.It was used to analyze the effects of four cooling processes on the cooling temperature drop,center-surface temperature difference and self-tempering temperature of the Ф7mm 86LX tire cord steel.The analysis results show that the center-surface temperature difference at the entrance of reducing sizing mill increases with the increasing of cooling water flow,especially when the cooling water flow less than 200m^3/h.The center-surface temperature difference caused by different cooling processes is range from 40℃to 131℃.The over cooling leads to the grain refinement on the surface of wire.Reducing the rolling speed and decreasing the cooling water flow could improve temperature homogeneity of wire at the rolling stage.

关 键 词：高速线材 穿水冷却 有限元模拟 冷却温降 芯表温差 返红温度 

分 类 号：TG335.63[金属学及工艺—金属压力加工]