方坯软接触电磁连铸初始凝固区高频磁场的分布

通过实验检测和数值模拟方法研究结晶器切缝形式，弯月面位置以及感应线圈匝数等因素对坯软民磁连铸结晶器内高频磁场分布的影响，分析结果表明，采用通体切缝形式的结晶器具有比封闭切缝形式结晶器更好的透磁性，增加感应线圈匝数时，可增大高频磁场在铸坯初始凝固区的有效范围，当液态金属弯月面位于感应线圈上沿附近时，高频磁场地初始凝固区的有效作用范围较大，电磁压力分布的不均匀程度较大，有助于获得高表面质量的铸坯，通过拉坯实验获得了表面质量得到明显改善的Sn-10Pb合金铸坯。

HIGH FREQUENCY MAGNETIC FIELD DISTRIBUTION IN REGION OF INITIAL SOLIDIFICATION WITHIN SOFT CONTACT ELECTROMAGNETIC CONTINUOUS CASTING MOLD OF BILLET

Experimental measurements and numerical analysis have been conducted to clarify the high frequency magnetic field distribution in the region of initial solidification within the soft contact EMCC (electromagnetic continuous casting) mold of billet. The effects of the divided types of EMCC mold, molten metal meniscus levels and coil turns on the distribution of magnetic field were investigated. The results show that the penetration of high frequency magnetic field in EMCC mold with open slit type is higher then that with closed slit type. By increasing the coil turns the effective range of magnetic field in the region of initial solidification increases. The molten metal meniscus level within the EMCC mold plays an important role on the surface quality of cast billets. When the meniscus level nears to the coil top the effective range of the magnetic filed becomes larger and the magnetic field distribution becomes uniform in the region of initial solidification of billet, which is helpful to improve the billet surface quality. On the base of the experiment and numerical study, the casting experiments for soft contact EMCC were carried out and the billets of Sn-10Pb alloy with high surface quality were obtained under high frequency magnetic filed with optimum operating parameters.