| 摘要 |
PURPOSE:To manufacture a flared tube continuously and at high speed by making V-shaped section intersecting at 90 deg. on left and right edges of a strip, and forming a plate cut to a specified length to tube-shape and fitting jagged fitting pattern. CONSTITUTION:A metallic strip 1 is fed continuously, and its left and right edges are formed to V-shaped section intersecting at 90 deg., and holes 8 for feed pilot and positioning are made by a piercing punch 8. It is then cut to a prescribed length and a cut plate 2 provided with jagged fitting patterns at both ens in longitudinal direction is formed. The cut plate 2 is held by a bending die 11 and a mandrel 12 and bent to inverse U-shape. Then, it is pressed by a pressing device 17 from lower right, lower left and below. Further, it is pressed from all sides by a pressing device 18 to form a tube 4. At the same time, jagged fitting patterns are fitted. This tube 4 is flared to form flared parts 5. |
