| 摘要 |
<p>PURPOSE:To improve accuracy of plate thickness while hardness is secured by determin ing allowable upper and lower limit values of draft from hardness control range of products and performing thickness control by determining target thickness at the outlet side so as to bring draft to those values from the thickness that is measured at the inlet side of a mill. CONSTITUTION:Thickness deviation DELTAH of the inlet side is operated with an arithmetic unit 21 for thickness deviation at the inlet side from a measured thickness H at the inlet side in a strip 17 which are obtained with a thickness meter 12 at the inlet side of the mill 11 and a set thickness H0 at the inlet side of the mill 11. Correctable thickness deviation DELTAH' at the inlet side is set according to whether measured thickness deviation DELTAH at the inlet side is or not in allowable range (lower limit value: DELTAHl, upper limit value: DELTAHu) of thickness deviation at the inlet side that is calculated from the range of draft with an arithmetic unit 22 for target thickness deviation at the inlet side. Rolling reduction position is calculated as thickness deviation at the inlet side with a thickness control device 15 to correct thickness deviation DELTAH' at the inlet side that is set with the above arithmetic unit 22 for target thickness deviation at the inlet side and thickness control is performed in feedforward with a control device 16A for screw-down.</p> |
