建立电磁软接触连铸结晶器内三维电磁场和温度场计算模型,研究采用方波和正弦波调幅后的高频调幅磁场对铸坯表面温度的影响.结果表明:方波和正弦波调幅磁场的感应热功率都与调幅波频率无关.方波调幅磁场的感应热功率(Q)介于单独施加用于调幅的两个恒幅磁场的感应热功率(Q_1和Q_2)之间,在Q_1和Q_2确定后,调幅磁场的感应热功率取决于各自作用时间T_1和T_2的相对比例;正弦波调幅磁场产生的感应热功率是高频磁场调幅前感应热功率的62%～64%.
A three dimensional finite element mathematical model of electromagnetic field and temperature field was developed to investigate the effect of high frequency amplitude-modulated magnetic field on the billet surface temperature. The results show that the induction heat power of magnetic field amplitude-modulated with sine wave and square wave is unrelated to the frequency of modulating wave. The induction heat power of magnetic field modulated with square wave is between the induction heat powers of the two constant amplitude magnetic fields employed to modulate. If the induction heat powers of the two constant amplitude magnetic fields are determined, the induction heat power of magnetic fields modulated with square wave is determined by the relative scale of the acting time of the two constant amplitude magnetic fields. The induction heat power of magnetic field modulated with sine wave is about 62-64% of that of the high frequency magnetic field before modulation.
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