| 摘要 |
PURPOSE:To cast a casting having good quality continuously by agitating molten steel in the unsolidified parts of the casting by making use of the electromagnetic induction agitating effect induced by supplying ACs of respectively different frequencies to a set of energizing coils thereby decreasing the central segregation of the molten steel. CONSTITUTION:The electromagnetic agitation of this invention in continuous casting of molten metal is accomplished as follows: ACs of respectively different frequencies are supplied to >=1 set of energizing coils and the kinetic direction and intensity of the agitation induced in the molten metal are changed momentarily by the synthesis of the magnetic fields generated by the ACs. As a result, the molten metal is agitated variously and continuously. The ACs to be loaded upon a set of the energizing coil are 1- 60Hz and the differences in the frequencies of the respective ACs are set at 0.03- 0.25Hz. In the stage of agitating the molten steel in a mold or in the ingot in the final solidification area where the thickness of a shell is thick electromagnetically, ACs of low frequencies of small attenuation, for example, 1-20Hz are used in order to allow lines of magnetic forces to arrive at the molten steel through the respective copper walls of the mold or the solidified parts of the ingot. |
