| 摘要 |
PURPOSE:To automatically and stably start continuous casting by controlling molten steel level in a mold, so as to form a parabola, after starting drawing of a cast slab and accelerating cast slab drawing velocity till the tundish weight is become to the prescribed value. CONSTITUTION:The molten steel supplied to the tundish 1 from a ladle 11 is poured in the mold 4 through a sliding nozzle 2 and submerged tube 3 and the cast slab obtd. by cooling and solidifying in there, is drawn by pinch roll 5. At the time of starting the cast slab drawing operation of continuous casting machine having the above constitution, the pouring rate of molten steel into the mold 4 is controlled to constant by a control part 13 through a weight detector 12 and sliding nozzle driving device 7. When the molten steel level in the mold 4 by the detector 8 is reached to the prescribed value, the drawing of cast slab is started. This drawing velocity is accelerated by the prescribed acceleration and controlled so as to form the parabolic locus till the molten steel level in the mold 4 is reached to the prescribed value. Then, when the tundish 1 weight is become to the prescribed value, the cast slab drawing velocity is controlled to the constant velocity through a pinch roll driving device 9.
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