| 摘要 |
PURPOSE:To provide a means by which a channel bar the shape in pin corner parts of which is sharp and accurate and the flatness of web of which is stably manufactured regardless of the kind of material. CONSTITUTION:A projecting hot forming roller in the finishing stage of a rolled channel the cross-sectional shape of the forming part of which is constituted by having inclined straight-line parts A which are situated on both end parts, inclined straight-line parts B with a different angle from that of the parts A are connected to the circular-arc part in the middle and inclined straight-line parts C with a another different inclined angle which are connected to both the inclined straight-line parts on the point where both inclined straight-line parts A, B are crossed. Further, when the relationship among the inclined angle theta1 of the inclined straight-line part A, inclined angle theta2 of the inclined straight-line part B and inclined angle theta3 of the inclined straight-line part C, the length of the inclined straight-line part C and the length of the straight-line part of the web part of an article to be formed are adjusted so as to be a specified relation and the relative position between the inclined straight-line part C and the article to be formed is held in a specified relation, the stability of finishing is more improved. |
