| 摘要 |
<p>PURPOSE:To change sheet thickness precisely and excellently by starting a tracking from the point of time when the load value of roll exceeds a fixed value, in a rolling where the sheet thickness is changed by changing a roll gap during rolling of the same rolling material. CONSTITUTION:A rolling material 1 is firstly passed between rolls 3 and is rolled, and the revolutions of roll 3 is caught and transmitted to a tracking counter 5 by a pulse oscillator 4 to give the instruction to a position-reference changing device 7 by a sheet-thickness changing-point detector 6, then a roll 3 gap is changed by a draft-position controlling device 8. In a rolling from the 2nd time by tandem system, the variation of rolling load due to a sheet-thickness changing part is caught by a load detector 10 to obtain the difference between the detected value and an estimated rolling load 12a by a load-difference arithmetic device 13, and the result is compared with a positive or negative allowable error 14a, 15a by a tracking-counter preset-value outputting device 16 to instruct the counter 5. As the roll gap is changed by said pressure variation, the succeeding different-thickness rolling can be automatically performed.</p> |
