| 摘要 |
<p>PURPOSE:To perform the plural number of rolling passes at high speed, and to improve the accuracy of sheet thickness with increase of the number of rolling passes, by alternately carrying out the thickness controlled rolling pass and the draft percenttage controlled rolling pass. CONSTITUTION:The feed-in side sheet length is measured by the device 1 whose output is sent to the counter 3; the feed-in side sheet thickness is measured by the thickness meter 11 whose output together with the presetted feed-in side thickness value 6 are inputted to the arithmetic circuit 13 for operating the feed-in side thickness deviation; outputs of the counter 3 and the arithmetic circuit 13 are inputted to both of rolling reduction arithmetic circuits 30, 40, respectively for the thickness control (AGC) and the draft percentage control (AGC); hereby, the run-out side sheet length is operated. Meanwhile, the run-out side sheet length is actually measured and its value is inputted to the circuits 30, 40, through the counter 4; the circuits 30, 40, operate the difference DELTAx (AGC) and DELTAx (ARC), from the operated run-out side sheet length and the actually measured run-out side sheet length; these values of DELTAx are inputted to the mode selecting circuit 70. The circuit 70 gives the output of DELTAx (AGC) to the hydraulic screw down type servomechanism 50 when the AGC mode is selected, and gives the output of DELTAx(ARC) when the ARC mode is selected; hereby, the mechanism 50 operates the screw down cylinder 60 through the electrohydraulic servovalve 51 so as to adjust the position of work rolls in order to control the thickness.</p> |
