| 摘要 |
PURPOSE:To provide a method by which an angle bar which is used for the framework of a steel frame building and whose outside corner part is made into a rectangular shape is manufactured at high productivity. CONSTITUTION:This method for manufacturing the angle bar consists of a 1st stage where cold working is respectively executed with rolling rolls 40, 41 in belt-shapes to both side parts 10, 10 leaving a desired part 11 in the middle in the width direction of a metallic flat plate 1 in belt-shape, 2nd stage where an intermediate member 121 is formed by upsetting the metallic flat plate 1 from the width direction of the metallic flat plate 1 and forming a projecting part 13 in the part 11 where cold working is not executed and 3rd stage where the angle bar having approximately rectangular cross-sectional shape is manufactured by forming so that the projecting part 13 of the intermediate member 121 is turned into the outside corner part with the groove 6 of a die or rolling rolls 60, 61 having the desired angle shape. |
