Patent ID: 6131431
Filing Date: 2000-10-17
Classification: B21C,B21D,B29C

Abstract:
A method of manufacturing a material for a pipe member, said method comprising:supplying a long plate having a spring-back characteristics;deforming said supplied plate by a roll-forming mechanism comprising a plurality of stages of rolls, to roll up said long plate around a longitudinal direction thereof at least two windings to make longitudinal edge portions of the rolled up plate overlap each other; andpulling the plate deformed in said deforming step along a longitudinally proceeding direction under a predetermined force; andwinding the pulled plate member onto a take-up bobbin having a rotary shaft in a direction perpendicular to said longitudinal direction with unfurling said plate rolled up in said deforming step, said method further comprising an applying step, said applying step comprises applying a twist to the plate pulled out in said pulling step so that the plate pulled by said pulling step may be wound around said take-up bobbin flatly.