| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress the plate thickness deviation of a tapered part, and to improve a dimensional precision by correcting the parallel part target length of a pass schedule from and after a (i+1)th pass based on the actual measured valtu of the parallel part length on a side where the plate is rolled out from an its pass. SOLUTION: When manufacturing the tapered plate with parallel parts at both tip parts in the longitudinal direction by multipass reversible rolling, at the time of the completion of the rolling of an ith pass, the length L1 (i)' of the parallel part 1 on the side where the plate is rolled out, is measured. L1 (i) is the length of the parallel part lon the pass schedule set for a first time. Errors occur in the L1 (i)' and the L1 (i) by the error, etc., of a slab volume, and an error occurs in the thickness of a tapered part 2. Accordingly, the parallel part length L1 (i+1) of the (i+1)th pass is predictively calculated by using the L1 (i)'. An operated result is set as the target length of the parallel part lon the bite side of the (i+1)th pass on the pass schedule. Consequently, the shift of the start point of a roll gap change caused by the error, etc., of the stab volume, is eliminated, the plate thickness deviation of the tapered part is suppressed, and the dimensional precision can be improved.</p> |
