| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the service life of a roll segment for constituting a light draft belt, by surely imparting a light draft quantity of a set value, when manufacturing a cast piece by lightly drafting the cast piece by the light draft belt constituted of the roll segment.SOLUTION: Roll opening of a cast piece support roll 6 is expanded toward the downstream side, and a thickness of the cast piece 10 is expanded by 3-10 mm, and afterwards, when manufacturing the cast piece by lightly drafting the cast piece of a range of at least 0.2-0.9 in a solid phase rate of a cast piece thickness center part by the light draft belt 14 constituted of the roll segment incorporated with a plurality of light draft rolls at a draft speed of 0.3-1.0 mm/min, assuming a cast piece long side surface width as W1, an unsolidified layer width in light draft starting time as W2, and a width of a non-draft part not in contact with the light draft roll on cast piece long side surface both ends as W3, the width W3 is set in a range of satisfying the relationship of the following (1) formula to the width W1 and the width W2 by adjusting a secondary cooling water quantity up to the light draft belt. W3≥(W1-W2)/2-10...(1)</p> |
