| 摘要 |
PROBLEM TO BE SOLVED: To reduce roll adjusting time and reduce or control edge waving by setting a roll position and a roll caliber so as to make particular the relations between a formed shape of material tube just before the first-stage fin pass roll and formed shape of the first fin pass roll and between the formed shape of the first-stage fin pass roll and the formed shape of the next-stage fin pass roll. SOLUTION: The relations between the formed shape of the material tube just before the first-stage fin pass roll and the formed shape of the first-stage fin pass roll and between the formed shape of the first-stage fin pass roll and the formed shape of the next-stage fin pass roll are made so as to satisfy formulae I, II, III, and IV. In the formulae, c1 is 1/2 of maximum width in the formed shape of the material tube just before the first-stage fin pass roll, f1 is 1/2 of maximum width in the formed shape of the first-stage fin pass roll, f2 is 1/2 of maximum width in the formed shape of the next-stage fin pass roll, D is outside diameter of the tube, and t is wall thickness. The unit is mm for all.
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