| 摘要 |
PURPOSE:To manufacture a flared tube continuously at high speed by forming bending parts for flaring on both ends of a strip and forming a plate cut to a specified length to tube-shape and fitting jagged patterns for fitting. CONSTITUTION:A metallic strip 1 is fed continuously and its left and right edges are bent by a bending roll 9 to form bending parts 2 for flaring. This is cut to a specified length to form a cut plate 3 that has jagged patterns for fitting on both ends in longitudinal direction. This cut plate 3 is held by a bending die 11 having a semicircular concavity 10 and a cylindrical mandrel 12 and formed to inverse U-shape. This is formed to a tube 6 by pressing with a pressing device 17 having a circular concavity from lower right, lower left and below. At the same time, jagged patterns are fitted to each other. Next, it is pressed from all sides with a pressing device 19 having a circular concavity 18 and a tube 6 that has flared parts 5 is formed. |
