| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of forming a material having a channel section in the range of the extent of 2.3-6 mm thick which is used for a structural material or the like, for example, without exchanging forming rolls and adjusting the position in the axial direction of the rolls though general-purpose roll-forming stands which are high in rigidity and have simple structure are used. SOLUTION: This method is a method of forming the material having the channel section with roll-forming apparatus in which roll-forming stands in which forming rolls 1, 2 are mounted on the upper and lower shafts which are supported at both ends are arranged in multistage. The material having the channel section is formed by using the rolls which are designed so that the material having the channel section which is largest in thickness among the materials having the channel section is formable and also, in the latter half of roughly forming region where the material having the channel section is formed into an approximately final shape, corner dimensions are corrected by using the forming rolls which are set properly to the thickness of the material having the channel section which is formed by the roll gap in the web and flange pats and the radius on the inside of the corner part held among the web and the flange and, after that, finish forming for removing residual stress and securing the dimensional accuracy is applied. COPYRIGHT: (C)2009,JPO&INPIT
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