施加与铸型振动同步的电磁场消除连铸坯表面缺陷  

Elimination of surface defects of continuously cast metals by synchronizing magnetic field with mold oscillation

作　　者：李廷举[1] 佐々健介 浅井滋生[2] 

机构地区：[1]大连理工大学铸造工程研究中心,辽宁大连116024 [2]日本国名古屋大学

出　　处：《大连理工大学学报》1999年第6期751-755,共5页Journal of Dalian University of Technology

基　　金：国家自然科学基金;大连市留学回国博士基金

摘　　要：用数值解析方法，计算了铸型在周期振动过程中，润滑剂流路内动压的分布和弯月面的形状；研究了当铸型外部施加高频交流磁场时，电磁压力对动压分布和弯月面形状的影响． 分别用数值计算和连铸模拟实验两种方法，探讨了施加与连铸铸型振动同步的电磁场消除铸坯表面缺陷的可能性．结果表明：电磁压力扩大了润滑剂流路的厚度，抑制了弯月面的变形． 在包含铸型最低位置的时间间隔内同步施加电磁场时，可以获得表面质量更优异的铸坯． 获得同等表面粗糙度的铸坯，需要的平均电流量按施加连续电磁场、间断电磁场、在期间Ｎ 内同步施加电磁场的顺序大幅度地减少．Distributions of dynamic pressure in a flux channel and meniscus shapes are calculated by numerical analysis, and the effect of electromagnetic pressure on the distributions of dynamic pressure and the meniscus shapes is investigated. Moreover, the possibility of eliminating surface defects of continuously cast metals by synchronizing magnetic field with mold oscillation is studied by the numerical analysis and model experiments. The main results are shown in the following: the imposition of the magnetic field from the outside a mold widens the flux channel and suppresses the variation of meniscus shapes during mold oscillation. When the imposing period of the magnetic field is synchronized with the mold oscillation period including the lowest position of a mold, the better surface quality of cast metals is obtained. The amount of electric current requiring to get the same surface quality decreases in the order of the continuous magnetic field, the intermittent magnetic field and its synchronized imposition.

关 键 词：连续铸造 电磁场 表面质量 铸型振动 表面缺陷 

分 类 号：TG249.7[金属学及工艺—铸造] TF777[冶金工程—钢铁冶金]