| 摘要 |
PURPOSE:To perform ordinary rolling and to prevent minus off-gage by maintaining a speed AGC signal at a specified value when the plate thickness in the final stand attains a permissible value and releasing the speed AGC signal when the rolling speed attains an ordinary speed. CONSTITUTION:A steel strip 1 is passed through each rolling stand and is taken up on a tension reel 3. When a front tension is generated in the strip 1, the rolling speed increases. When the traveling speed attains Si in a final stand 10, a speed AGC signal is outputted from an AGC 6 and rolling is started. When the plate thickness attains the permissible upper limit value of the finish thickness and enters the inside of a dead band, an arithmetic part 20 controls the AGC 6 and maintains the speed AGC signal at a specified value during rolling. The locked state of the speed AGC signal of the AGC 6 is released by the part 20 and the ordinary rolling is started in the stage when the rolling speed of the final stand 10 attains an ordinary rolling speed Sn, that is, in the stage when the thickness of the strip 1 is made roughly constant. |
