| 摘要 |
<p>PROBLEM TO BE SOLVED: To reliably manufacture a tapered steel plate while keeping flatness in the minimum thickness part good even in the tapered steel plate whose thickness variation is comparatively large. SOLUTION: When the tapered steel plate 6d is manufactured by rolling a material for rolling, rolling reduction to the minimum thickness part 8a of the tapered steel plate 6d is taken approximately identical with the rolling reduction set for each pass of a plurality of passes when a flat plate having the same thickness as the minimum thickness part 8a of the tapered steel plate 6d is manufactured by rolling from this material for rolling and respectively decided for each pass of the plurality of passes. The rolling reduction to the rest of parts 7a, 7b, 8b, 8c other than the minimum thickness part 8a is respectively decided for each pass of the plurality of passes according to the rolling reduction which is respectively decided for each pass of the plurality of passes about the minimum thickness part 8a. On the basis of the rolling reduction which is respectively decided for each pass of the plurality of passes about the minimum thickness part 8a and the rolling reduction which is respectively decided about the rest parts 7a, 7b, 8b, 8c, the rolling schedule of the tapered steel plate 6d is decided and the rolling of the plurality of passes is applied to the material for rolling.</p> |
