| 摘要 |
PURPOSE:To prevent development of diagonal crack in a cast slab by making recessed crown roll of cast slab straightening rolls at outside of bending in straightening zone and forming the straightening rolls at inside of bending as projected crown. CONSTITUTION:In multiple point straightening Bending type continuous casting machine, the roll 8i at outside and the roll 7i at inside of bending at No. (i) in the straightening zone 3 are formed as the recessed crown roll and the projected crown roll having 8i and 7i crown rates operated based on the prescribed equation, respectively. By this method, in the bending straightening process of the cast slab 11 (straightening zone 3), as restriction by the straightening rolls 7i, 8i are remarkably relaxed, it is prevented that development of strain is concentrated to the short side corner part at inside of the bending. Therefore, as the development of the strain is ideally dispersed, the development of the diagonal crack in the cast slab is surely prevented.
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