| 摘要 |
<p>PURPOSE:To stabilize a control, to raise a control accuracy, and to raise a yield of a product by executing a control by calculating a control gain and a tuning rate based on an actual mill constant of a rolling mill and a plastic deformation coefficient. CONSTITUTION:At the time of rolling of each pass, a mill constant M of a rolling mill in the pass concerned is calculated based on a rolling load deviation, an entry plate thickness deviation, a delivery plate thickness deivation, and a roll gap deviation. Based on this mill constant M, a range of a tuning rate (k) is calculated by an inequality I . Provided that K, T1 and T2, MC, and Q denote a control gain, parameters in a hydraulic rolling reduction device, a mill constant used for a control of the pass concerned, and a plastic coefficient, respectively. Or the control gain K is calculated by an inequality II, and the tuning rate (k) and the control gain K are compared with a tuning rate k0 and/or a control gain K0 used in the pass concerned. In case they are deviated from a range, the tuning rate k0 and the control gain K0 are corrected and a plate thickness is controlled.</p> |
