| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for continuously casting a small cross-sectional cast billet, in which a stable operation is attained by stably reducing a friction-resistance between a mold and the cast billet and preventing the generation of fusion of the cast billet to the mold. SOLUTION: In the continuous casting method for casting by using a curving type or a vertical type continuous caster while vertically oscillating the mold, a drawing speed of the cast billet is slower than an average drawing speed at a mold ascending period and faster than that at a mold descending period and also, a casting billet length, a secondary cooling ratio water amount, casting speed, an oscillation amplitude and a number of amplitude, are controlled appropriately, by arranging a drawing speed increasing/decreasing mechanism, in which an elastic body or a combining of the elastic body and a damper are composed between a pinch roll driving motor for drawing the cast billet and the pinch rolls and an idle part is included in a driving rotational direction and a reversed driving rotational direction, and the displacement amount with the idle part to the driving direction or the reversed driving from the neutral position is±2 to±30 mm in the driving direction by conversing to the circumferential length of the pinch roll, and which has the returning power to the neutral position. COPYRIGHT: (C)2009,JPO&INPIT
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