| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the reduction of area generated in the tail end part by measuring thicknesses in both width end parts of a material to be rolled between intermediate stands, determining the amount of sheet wedge based on the measured values and correcting the difference between roll opening degrees on the operation side and the drive side of a stand on the upstream side of the space between the intermediate stands based on the amount of the plate wedge. SOLUTION: An intermediate stand thickness gage 4 is provided on the outlet side of a stand F4 and the thicknesses in both width end parts of the material 1 to be rolled are measured on-line. The measured values are inputted into an arithmetic and control unit 5 and the amount of plate wedge of difference between the thicknesses on the operation side and the drive side is determined. Based on the amount of this plate wedge, the value to be corrected of the difference between the roll opening degrees on the operation side and the drive side of the stand on the upstream side of the intermediate stand thickness gage 4 is determined and correction signal is sent to screw-down devices 3. Thus, even when rolling such as a large plate wedge is generated is executed at the stands F1-F3, the plate wedge is reduced on the outlet side of the stand F4 and rolling by which the change of wedge ratio is small is executed at the stands F5-F7 where the reduction of area is apt to generate.</p> |
