| 摘要 |
<p>PURPOSE:To calculate crown quantity from the detected value of the corrected sheet thickness at the edges of a sheet and the detected value of the sheet thickness at the central part thereof and to control the crown quantity with high accuracy in the stage of calculating the crown quantity of the sheet on the outlet side of a rolling mill by correcting the detected value of the sheet thickness at the edges according to the transverse deviation of the sheet width in the position where the thickness at the edges in detected. CONSTITUTION:Edge detectors 3-1, 3-2 which detect both edges of the sheet, a scanning type sheet thickness detector 4-2 which is travelable in the transverse direction of the sheet and a stationary type sheet thickness detector 4-1 fixed to the central part of the width of the sheet are provided on the outlet side of the rolling mill. The transverse profile at the front end of the sheet on the outlet side of the rolling mill is detected by the detector 4-2 and thereafter the sheet is fixed in the position of a specified distance in the central direction from one edge and the sheet thickness at the edges is detected. The extent of the movement in the transverse direction of the sheet based on the time when the sheet profile is detected and the width deviation of the sheet are calculated from the detection signals of the detectors 3-1, 3-2 and the detected value of the thickness at the edges is corrected from the calculated value and the sheet profile. The crown quantity of the sheet is calculated from the corrected thickness at the edges and the central thickness detected by the detector 4-1 and the roll bending is controlled in accordance with the calculated value.</p> |
