双磁力驱动器对液态金属流动的驱动与控制

Liquid Metal Flow Driven and Controlled by Magnetic Force Double-Driving Apparatus

摘要:

根据电磁场和磁流体力学理论，设计制造了以永磁体为工作介质，对金属液具有磁力驱动控制作有的双磁力驱流体流动控制器。理论和实验研究结果表明：该控制器可实现对金属熔体无接触的磁力驱动搅拌；并可对弯月面形状和波动进行控制，当下磁力驱动器转速35r/s ,上驱动器转速20r/s时，液面平直且波动较小，即液面达到似稳状态；该实验条件下Sn＋3．5％Pb（质量分数，下同）合金连铸凝固组织为100％细等轴晶，连铸坯的初期凝固点降低，凝固坯壳变薄且无效。

Abstract:

Base on the theory of electromagnetic field and magneto hydrodynamic, an apparatus of double-driving by magnetic force media with permanent magnet has been designed and manufactured. The characteristics analyzed from theory and experiment show that the apparatus can drive and stir molten metal without any directly contact; the shape and wave of meniscus can be controlled by the apparatus. When velocity of down driver is 35 turns per second, the upper is 20 turns per second, surface of metal liquid is more straight with little wave. That is like-stabilization state of meniscus; under this condition solidification structure of continuously casting is100% fine equiaxed structure, initial solidification point is descended and the solidification shell become thinner and uniformity.