| 摘要 |
PROBLEM TO BE SOLVED: To conduct preforming, that is, imparting of prestrain distribution and roll rolling as a series of processes by arranging a rolling mill capable of rolling at a specified draft as a preforming device and rolling to adjust a plate thickness/plate shape for a hoop coil before forming. SOLUTION: A rolling mill 4 having 1-10% draft, e.g. four stage skin pass mill is arranged as a preforming device immediately before roll forming machines 1, 2, 3 groups. Further, a rolling mill capable of imparting a strain distribution of±0.2-±1.5% as a preforming device is arranged immediately before the roll forming machine groups, preforming to improve formability is preferably conducted for a hoop coil before forming. The rolling mill 4 is arranged at an upstream side of the roll forming machine groups, the hoop is recoiled by a pay-off reel, tension is adjusted by a pinch roll, successively, a hoop coil S is subjected to required rolling, while adjusting a plate thickness and plate shape, a high precision hoop S is fed to the forming machine groups.
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