| 摘要 |
PURPOSE:To enable the selection of the optimum magnet shape, size and set position by which sufficient rabbling may be done even with a thick slab without removal or diameter-reduction or rolls by providing the magnetic on the back of the slab support roll at the time of flowing the molten metal in the slab by electric current and magnetic field. CONSTITUTION:During the time until the slab perfectly freezes from mold part, the slab 1 has a frozen shell 2 and unfrozen molten steel 3. Between these, a DC electromagnet 4 is provided to one side of the slab with the magnetic pole being opposed to the face in the width direction of the slab, for example, on the back of the upper slab support roll group 51. The magnetic field 6 of which the main direction of the magnetic lines of force is perpendicular to the slab pulling direction 12 and in the slab thickness direction is generated in the slab. On the other hand, direct current 10 is flowed approximately parallel to the direction 12 from the brushes 71 provided to the rolls 81, 82, 91, 92 just before and behind the roll group 51 and the lower side roll group 52 opposing thereto, respectively to 72. As a result of this, the mutual action of the magnetic lines 6 of force and the electric current 10 flowing in the slab causes the electromagnetic force 11 to be acted upon the slab of these portions in the direction perpendicular to both of these, whereby the molten steel is flowed and rabbled in its main direction. |
