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利用有限元分析软件,建立了380 mm×280 mm大方坯结晶器电磁搅拌的三维数学模型,系统研究了电磁搅拌工艺参数(电流250～500 A,频率1.5～3.0 Hz,结晶器铜板厚度34～40 mm)对结晶器内电磁场的分布影响。结果表明,结晶器内磁感应强度沿铸流轴向呈“两端小、中间大”分布;电流从350 A增大到500 A,搅拌器中心的磁感应强度呈线性递增;频率由1.5Hz增大到3.0Hz,搅拌器中心磁感应强度仅减小0.001 5 T;随着结晶器铜板厚度的增大,铸坯宽面、窄面和角部的磁感应强度都减小。在实际连铸U71Mn重轨钢中,电流应该维持在400 A以上。
The three-dimensional mathematical model of electromagnetic stirring of 380 mm × 280 mm bloom mold was established by finite element analysis software. The parameters of electromagnetic stirring (current 250 ~ 500 A, frequency 1.5 ~ 3.0 Hz, mold copper thickness 34 ~ 40 mm) on the electromagnetic field distribution in the mold. The results show that the magnetic flux density in the mold is distributed along the axial direction of the casting stream, and the current density increases from 350 A to 500 A. The magnetic induction intensity in the center of the mixer increases linearly from 1.5 Hz Increasing to 3.0Hz, the magnetic induction intensity in the center of stirrer decreases only by 0.001 5 T. With the increase of mold copper thickness, the magnetic induction intensity of wide face, narrow face and corner of slab decreases. In the actual continuous casting U71Mn heavy rail steel, the current should be maintained at 400 A or more.