| 摘要 |
<p>PURPOSE:To reduce the off-gage products by enhancing the thickness accuracy at the tip part of a sheet through computation and control of the thickness at the tip part of the sheet. CONSTITUTION:A sheet speed meter 6 measures the moving speed on the inlet side of a rolling mill, a sheet thickness meter 7 measures a sheet thickness on the inlet side of the rolling mill, speed meters 14, 15 at the tip parts of the sheet measure moving speeds of the tips of the sheet on the outlet side of the rolling mill and a sheet speed meter 13 measures a speed of the sheet on the outlet side of the rolling mill. A sheet thickness tracking device 8 tracks sheet thicknesses measured by the sheet thickness meter 7 through the measured values of these speed meters 6, 14, 15, 13. A sheet thickness arithmetic unit 9 computes the sheet thickness on the outlet side by a mass flow expression from measured values of the tracked sheet thicknesses on the inlet side, a moving speed of the sheet on the inlet side, a moving speed of the tip of the sheet on the outlet side, a moving speed of the sheet on the outlet side and a controller 10 controls the rolling mill based on a difference between an operation value of a computed sheet thickness and its target value.</p> |
