| 摘要 |
<p>PURPOSE: To attain a large widening amount by the min. rolling frequency even when it is a wide thin sheet material having large aspect ratio, to increase the degree of freedom in width adjustment and to make the maintenance and control of roll easy in a rolling method and a rolling mill group. CONSTITUTION: First, by rolling in a 1st stage with a roll 2 having rugged cross-sectional shape on which plural groove parts 2a are formed in the axial direction and a flat roll 3, a metal plate 1X on which plural rolled parts 1a and unrolled parts 1b are made to coexist in the width direction. Next, by rolling in the 2nd stage with both upper and lower flat rolls 4, 5, only unrolled parts 1b in the 1st stage are rolled and the metal plate 1Y is obtained. Next, by rolling in the 3rd stage rolling with both upper and lower flat rolls 6, 7, all part in the width direction of the metal plate 1Y is rolled and a flat plate 1Z is obtained.</p> |
