| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize excellent thickness accuracy from the foremost part. SOLUTION: On the basis of the actual value of the pressure of a hydraulic cylinder and screw-down location just before a rolling mill is stopped after the final rolling point of a preceding pass is rolled, memory pressure is obtained by performing filtering treatment to the actual value of the pressure of the hydraulic cylinder when the screw-down location of the hydraulic cylinder turns into the release direction. On the basis of the screw-down location of the hydraulic cylinder, memory pressure, detected value of the outlet-side thickness and detected value of the inlet-side thickness when the final rolling point is rolled, the gagemeter thickness at the final rolling point of the preceding pass is calculated. On the basis of the gagemeter thickness and the detected value of the inlet-side thickness, the amount of correction is calculated in order to calculate the pressure reference at the rolling starting point of the next pass taking the rolling conditions at the moment the memory pressure is detected into consideration. The pressure reference is calculated on the basis of the memory pressure, taking the amount of correction into consideration. Taking the pressure of the hydraulic cylinder as a specified pressure reference on the basis of the pressure reference, the rolling of the next pass is started.</p> |
