| 摘要 |
<p>PURPOSE:To improve the accuracy of plate thickness control by finding a difference between diameters of upper and lower work rolls before and after the start of rolling of each of the upper and lower work rolls. CONSTITUTION:In inverse proportion as the diameter of the upper work roll 1 increases, the number of pulses from a detector 5 of the number of rotation of the upper work roll decreases from P1 to P11. Accordingly, if a proportion of P11 to P1 is found an increment d1 of the diameter is obtained. In the same way, an increment d2 of the diameter is obtained to the lower work roll 3. In this way, the diameters of the upper and lower work rolls 1, 3 can be measured directly through the increments d1 and d2. When the clearance between the upper and lower work rolls 1, 3 is controlled in accordance with these increments d1 and d2, the accuracy of thickness control of a strip can be improved.</p> |
