| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of a flaw, breakout, and deterioration of the condition of the cut face of a cast piece, by enabling the cast piece to be cast into a complete round in its cross-sectional shape and preventing an abnormal behavior of the cast piece caused by billet's vertical oscillation. SOLUTION: The traveling amounts of the cast piece 5 in the casting direction and in the reverse casting direction in the continuous casting are measured with a resolving power of preferably 0.01-0.2 mm per pulse. When one pulse or several pulses in the reverse direction is detected after several-several ten pulses in the casting direction continue, the generation of the abnormality behavior of the cast piece 5 is decided. After the detection of the abnormal behavior, the frequency of the oscillation is made to increase in proportion to the amount of the abnormal behavior, and the amplitude is made to decrease, or the casting speed and the frequency of the oscillation are made to decrease, and the amplitude of the oscillation and the inputting amount of mold powder are made to increase.
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