| 摘要 |
<p>PURPOSE:To prevent the meandering of material to be rolled without generating out-of-tolerance of thickness by executing finish rolling after the thickness in the tail end part in the longitudinal direction of material to be rolled is preliminarily thinned and reducing draft at the downstream stands of finish mill for the tail end part. CONSTITUTION:After a sheet bar 2 is rolled so that the thickness of the tail end part in the longitudinal direction on the outlet side of the final pass of a roughing mill 11 is thinned, it is finishing rolled. The target value of thickness on the outlet side of the final stand of a finishing mill 13 is set so that thickness is gradually thinned toward the tail end from the point of about 2 m on this side of the most tail end of the sheet bar 2. Based on this target value of thickness, gage meter system thickness control is executed at each stand and the draft for the tail end part at the downstream stands of a line of the finishing mill 13 are made smaller than the draft for normal part. In this way, the meandering of material to be rolled is prevented and the generation of drawing can be prevented.</p> |
