(1. 东北大学 材料与冶金学院,沈阳 110004;
2. 上海宝钢集团 梅山钢铁股份有限公司,南京 210039)
摘 要: 利用结晶器传热模型、热/应力模型和现场数据,建立了结晶器内液体摩擦力计算模型,利用该模型分析了某钢厂2.0 m/min拉速下结晶器非正弦振动振幅对液体摩擦力的影响,给出了振幅选取原则和确定方法。结果表明:拉速一定时采用小振幅振动可限制最大液体摩擦力,增大保护渣耗,减小负滑脱时间,随拉速提高应适当增大振幅,以改善振动效果;结合现场工艺,确定拉速2.0 m/min时的适宜振幅为±4 mm,拉速升至2.2 m/min,振幅相应增至±4.5 mm;保护渣膜厚度计算结果符合生产实际,为研究结晶器内润滑机理提供了条件。
关键字: 连铸结晶器;非正弦振动;振幅;液体摩擦力;保护渣膜;润滑
continuous casting mold with high casting speed
(1. School of Materials and Metallurgy, Northeastern University,Shenyang 110004, China;
2. Meishan Iron and Steel Co. Ltd., Shanghai Baosteel Co.,Nanjing 210039, China)
Abstract:A mathematical model to the represent liquid flux friction in mold was established by heat-transfer model, heat-stress model and actual data. The effect of non-sinusoidal oscillation amplitude on liquid friction force was analyzed at casting speed of 2.0 m/min, the selection principle and determination method of amplitude were also introduced. The results show that the small amplitude application at certain casting speed can restrict the maximal liquid friction force, increase the flux consumption and decrease the negative strip time. The amplitude should be suitably increased with casting speed to improve the ameliorate oscillation effect. Combined with the casting production, the optimum amplitudes casting speed of 2.0 m/min and 2.2 m/min are obtained as ±4 mm and ±4.5 mm, respectively. The flux film thickness that accords with the practical condition commendably provides guidance to study the mold lubrication mechanism.
Key words: continuous casting mold; non-sinusoidal oscillation; amplitude; liquid friction force; flux film; lubrication