| 摘要 |
<p>PURPOSE:To improve the thickness control accuracy and the yield, by arithmetically processing a part of output of the precision thickness control system, and by installing the monitor means for feedback to the rough thickness control system. CONSTITUTION:The product thickness deviation DELTAhN detected by the gaugemeter 26 is inputted to the precision thickness controller 30, and undergoes the gain correction with the rolling speed; after that, the output is branched. One branch undergoes the PI control operation as well as the conventional method, and adjusts the rotational speed of the work roll 18a of the final rolling stand through the speed controller 28. Another branch is inputted to the monitor circuit 50, and undergoes the PI control operation with the operational constant different from the precision thickness controller 30, and is inputted to the rough thickness controller 36. The thickness deviation DELTAh2 on the exit side of the second rolling stand 16 is also inputted to this controller 36. When the monitor circuit 50 produces no output, the zero control is carried out so as to make zero the thickness deviation detected by the gaugemeter 32. When the monitor circuit 50 is producing the output, an offset corresponding to this output causes in the thickness deviation on the exit side of the second rolling stand, however, this offset is finally dissolved in the rough control system 24.</p> |
