高频调幅磁场下无结晶器振动电磁连铸技术的实验研究

研制了可以产生方波、正弦波及三角波3种波形高频调幅磁场发生器，并对其在结晶器内产生的磁场进行了测量．进行了3种波形高频调幅磁场下的无结晶器振动电磁连铸实验，结果表明：在方波、三角波和正弦波调幅磁场作用下的无结晶器振动电磁连铸过程中，当调制波频率略低于系统固有频率时，弯月面与结晶器壁间断接触距离最大，保护渣润滑效果最好，连铸过程拉坯阻力最小，连铸坯表面质量相对较好；在3种高频调幅磁场中，与三角波和方波相比，正弦波较易于减小拉坯阻力和改善铸坯表面质量。

Experimental Study on Mold Oscillation-Less Continuous Casting Process Under High Frequency Amplitude-Modulated Magnetic Field

A high frequency amplitude-modulated magnetic field (AMMF) generator that can produce rectangle, triangle and sine waves has been invented, and the magnetic field inducted in the mold by the generator was measured. The amplitude-modulated magnetic field has been applied in mold oscillation-less electromagnetic continuous casting (MOLECC) process, the experiment results show that under rectangle, triangle and sine wave AMMF, when the modulated wave frequency is a little less then the: intrinsic frequency of the experimental system the intermittent contacting distance is the greatest, the mold flux lubricating is the best, the continuous casting withdraw resistance is the least and the surface quality of billets is better relatively. Among the three wave types, the sine wave is better than the; rectangle and triangle waves for deducing the withdraw resistance and improving the billets surface quality.