| 摘要 |
<p>PURPOSE:To improve the plate thickness accuracy by providing intermediate rolls with roll chock positional variation detectors, providing work rolls with an arithmetic unit of gap variation amounts, and drafting with consideration for positional variation of the intermediate rolls in the rolling direction. CONSTITUTION:Upper and lower intermediate rolls are provided with position detectors 1, 1' and 2, 2' detecting horizontal positional variations and a roll gap correction amount computing element 3 calculating gap variations of work rolls is installed. The computing element 3 previously inputted every roll diameters calculates gap variations between work rolls based on offset amount variations of the intermediate rolls and inputs the calculated gap variation to a draft device 4. Then, the draft device 4 corrects the position of draft cylinders 5 and 6 by the gap variation amount. In that method, a gap between work rolls is kept constant against offset variation amounts of the intermediate rolls, so that the plate thickness accuracy is improved.</p> |
