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作 者:陈芝会[1] 王恩刚[1] 雷洪[1] 赫冀成[1]
机构地区:[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110004
出 处:《铸造技术》2008年第8期1043-1047,共5页Foundry Technology
基 金:国家高技术研究发展计划项目(2001AA337040);辽宁省科技攻关项目(2005221006);辽宁省青年人才基金(2005221004)
摘 要:用Pb-Sn-Bi低熔点合金模拟研究了电磁制动对连铸结晶器内液面波动、弯月面温度和氩气泡漂浮分布的影响。实验结果表明,当磁场为0.5 T时液面的平均波动最小。根据相似原理可推得,应用到实际连铸机抑制结晶器液面波动的最佳磁感应强度为0.36 T。为防止水口堵塞而吹入的氩气主要在水口附近向上漂浮,对弯月面产生很强的扰动。电磁制动改变了氩气向上漂浮的轨迹,加强了气泡在水口和结晶器窄面之间的漂浮,使氩气泡在结晶器宽度方向上的漂浮分布更均匀,减小了水口附近由于大量气泡上浮对液面的扰动。自由液面处最大气体通量减小,从而减小了卷渣发生的可能性。Pb-Sn-Bi alloy was used to simulate the fluid flow phenomena in the continuous casting mold with electromagnetic brake (EMBR), and the influence of EMBR on the level fluctuation, temperature of molten metal at meniscus and floating distribution of argon gas bubble were studied. The tested results show that the magnitude of average level fluctuation is minimal at a magnetic flux density of 0.5 T. According to the similarity rule, it is deduced that the optimal magnetic flux density for depressing the fluctuation of meniscus is 0.36 T at the real caster. The argon gas is supplied to the mold to prevent the immersed nozzle from clogging. The argon gas bubbles mainly float up near the nozzle and strongly disturb the meniscus. EMBR changes the trajectories of argon gas floating up and enhance the floating up of gas bubbles between the nozzle and the narrow side of mold, hence the floating distribution of gas bubbles in the width direction of mold is more uniform, and the disturbance of floating gas bubbles near the nozzle on the meniscus is decreased. And the maximal flux of argon gas in the free surface is reduced, so the occurrence of mold flux entrapment is reduced.
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