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大方坯連鑄結晶器電磁攪拌三維電磁場的數值模擬

Numerical simulation of 3-D electromagnetic field in a bloom continuous casting mold with electromagnetic stirring

  • 摘要: 借助ANSYS有限元分析軟件對240mm×280mm大方坯結晶器電磁攪拌磁場進行了數值模擬,系統研究了電磁攪拌參數對結晶器內磁場和電磁力的影響規律.結果表明:磁場在結晶器電磁攪拌器內產生的旋轉電磁力在水平截面上形成一對力偶,驅使鋼液順時針旋轉;結晶器高度方向上磁場分布呈"兩端小中間大"分布特征.數值計算的磁感應強度與實測結果基本吻合.提出了杭鋼大方坯45#鋼電磁攪拌優化后的工藝參數為電流350A和頻率3Hz,實驗表明在此工藝參數下鑄坯質量得到顯著提高.

     

    Abstract: According to the Maxwell electromagnetic field theory,electromagnetic fields during mold electromagnetic stirring for 240 mm×280 mm bloom casting were simulated by means of ANSYS software.The distributions of magnetic fields and electromagnetic force as well as the effects of string parameters on magnetic field characteristics were analyzed.It is shown that the rotary magnetic field generates electromagnetic force in the mold region,which made molten steel whirl at the horizontal section.The characteristic of the magnetic field along the mold vertical direction was large in the middle and small at the end of the mold.The simulation results of magnetic induction density were consistent with the measured ones.Final,the optimized M-EMS parameters of the current intensity of 350 A and the frequency of 3 Hz for 45# steel blooms were proposed and the results indicates that the quality improves obviously.

     

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