| 摘要 |
<p>A rolling mill comprises a pair of an upper and a lower work roll (1, 2) having a small diameter (Dw) which is as large as about 0.15 to 0.30 times the width (W) of a metal sheet article (13) to be rolled, a pair of an upper and a lower back-up roll (5, 6), a pair of an upper and a lower intermediate roll (3,4) disposed intermediate between the work roll pair and the back-up roll pair, work roll bending units (31, 32, 33, 34) and intermediate roll bending units (39, 40, 41, 42) imparting bending forces to the roll ends of the upper and lower work rolls and/or the roll ends of the upper and lower intermediate rolls respectively, roll shifting units (110, 120) capable of shifting the upper and lower intermediate rolls in axial directions opposite to each other, and drive units (70, 71) coupled to the associated ends of the upper and lower intermediate rolls respectively to rotate the upper and lower work rolls at different peripheral speeds through the intermediate rolls. The directions of roll bending by the work roll bending units and/or the intermediate roll bending units and the relative movement of the body ends of the intermediate rolls relative to the widthwise ends (13A, 13B) of the sheet article (13) caused by the roll shifting units are controlled thereby forming slight edge waves in the widthwise edge regions of the sheet article, so that, even when a high tension is applied to the sheet article during rolling with a high reduction ratio, occurrence of cracks in the widthwise ends of the sheet article is minimized to prevent breakage of the sheet article.</p> |
