| 摘要 |
PURPOSE:To obtain a deformed section bar having the part where the thickness differs in the transverse direction without generation of any twist or the like by rolling down a flat blank plate with a grooved roll to buckle and deform the unrolled part to be walled thickly and rolling this part. CONSTITUTION:A blank bar 4a which is a flat plate molding is passed between a grooved roll 2 having a groove part 1 in the part for working the material thickly and a flat roll 3 to apply rolling down force only on the part 5 to be walled thinly. The groove part 1 of a thick walled part 6 in an unrolled state is buckled and deformed by the rolling down force. The rolled bar 4b having the part 6 in the buckled state is passed between flat rolls 7 and 7 to roll down only the part 6 again to a prescribed thickness, whereby a deformed section bar 4c is obtained. The snaking or twisting of the bar is prevented by this method, whereby the number of working stages is reduced and productivity is improved. |
