| 摘要 |
<p>PURPOSE:To improve sheet thickness accuracy by detecting the sheet thickness on the outlet side or inlet side of a stand, inputting the sheet thickness signal to rolling down control devices and speed control devices and operating the rolling down devices of the respective stands in accordance with the devaition from the target sheet thickness value. CONSTITUTION:Roll speed control devices 13-16 are provided to the respective stands of a tandem rolling mill and low-pass filters 20-22 for low-frequency AGC of Nos. 2-4 stands and high-pass filters 32-34 for high-frequency AGC are respectively provided. The high-frequency component and low-frequency component of the sheet thickness fluctuation of the previous stand are separated. Only the high-frequency component is removed by the high-frequency AGC device of that stand and the low-frequency component is removed by the low-frequency AGC of the respective other stands. The sheet thickness fluctuation over the entire frequency region of the material 31 to be rolled is removed by the above-mentioned method. The sheet thickness accuracy is thus improved.</p> |
