| 摘要 |
<p>PURPOSE:To set a roll gap and the number of revolutions of roll by adding the extent of influence to a reference set value, by storing reference set values and influence factors of the roll gap and the number of revolutions of roll with respect to the outer diameter and wall thickness of a blank pipe, and calculating the extents of influence of the variations of rolling conditions affecting the reference set values. CONSTITUTION:Reference set values P0, N0 and influence factors deltaP0/deltaXi, deltaN0/deltaXi with respect to the set values are stored in an operation standard table basing on theoretical models and the measured data. Next, set values p0, n0, deltaP0/deltaXi, deltaN0/deltaXi of each lot are obtained from the operation standard table by interpolations, etc. at the time of inputting the informations of a lot. And the extent of influence affecting the set value of the variation of rolling condition is calculated by an equation I , and the result is added to the reference set value to obtain the set values (p), (n) at the time of actual rolling. Here, (p), (n); the set values of a rolling load and the number of revolutions of roll of each piece when disturbances DELTAD0, DELTAt0,... occur, p0, n0; that is the reference set values of a lot when no disturbance occur.</p> |
