频率对矩形电磁连铸结晶器内磁场和弯月面的影响

研究了在电磁软接触连铸过程中,电源输入频率的变化对矩形电磁软接触结晶器内的磁感应强度分布规律和弯月面变化情况的影响.结果表明:当电源输入频率增大时,结晶器内的磁感应强度减小.电源输入频率的改变不影响结晶器内磁场分布的相对均匀性.弯月面的高度与电源输入频率成反比,频率越高,弯月面稳定性越好.在实际生产中,如果需要提高电源输入频率,则应该同时适当的增大电源功率来弥补激励电流的减小,以保证软接触效果.

Influence of Frequency on Magnetic Field Distribution and Meniscus in Rectangular Soft-Contact EMCC Mold

The distribution of magnetic induction in rectangular soft-contact mold during electromagnetic continuous casting(EMCC) was investigated considering the electric frequency.The low-melting-point Sn-Pb-Bi alloy was used as simulacrum to investigate the distortion of meniscus.The results showed that the magnetic induction in mold decreases with increasing frequency while the changing frequency does not affect the uniformity of distribution of magnetic induction.The height of meniscus is in inverse proportion to the frequency,i.e.,the higher the frequency,the more stable the meniscus.Actually to ensure the effect of soft-contact continuous casting,the power input should be increased to compensate the decrease in exciting current if the frequency increases.