| 摘要 |
<p>PURPOSE:To enable preventing the break of sheet by scarifying the shape of sheet in the part where edge crack is generated by adjusting the target shape of downstream or upstream stand from that stand when the length of edge crack longer than a prescribed value is detected. CONSTITUTION:At the time of cold rolling a strip metal with a cold rolling mill which is provided with plural rolling stands, the length of edge crack and shape in the width direction in the end parts of sheet are detected on at least the outlet side 2 of a 1st rolling stand. When the length of edge crack is longer than the reference value, the break of sheet due to the development of edge crack can be prevented by controlling tension that is applied to the end parts of sheet by rolling the shape on the outlet side of the rolling stand on the downstream side or upstream side from that stand into the shape of edge wave.</p> |
