Experimental study on mould oscillation-less continuous casting process under high frequency amplitude-modulated magnetic field

摘要

In order to investigate the influence of high frequency magnetic fields on surface quality of billets in the soft-contacted electromagnetic continuous casting, several kinds of high frequency Amplitude-Modulated Magnetic Field (AMMF), that is, rectangle, triangle and sine wave AMMF were adopted in this experimental research. The magnetic field flux in the mould and the intermittent contacting distance were measured. The experiments of Mould Oscillation-Less Electromagnetic Continuous Casting (MOLECC) of tin under the three wave kinds of AMMF were carried out. It is shown that: (1) During the MOLECC process under the rectangle, triangle and sine wave AMMF when the modulated wave frequency is a little lower than the intrinsic frequency of the experimental system the intermittent contacting distance is the greatest, the mould flux lubrication is the best, the continuous casting withdrawing resistance is the least and the surface quality of billets is the best. (2) among the three kinds of AMMF, sine wave is the best in deducing the withdrawing resistance and improving the billets surface quality.