| 摘要 |
PURPOSE:To perform highly accurate bending with small deformation of sectional form and small reduction of sectional size by performing bending while thrusting a section against a bending die and applying tension to the section. CONSTITUTION:Both ends of a section 1 are held by chucks 13, 20 and brought into contact with the base of the first bending die 8, and specified tension T3 is applied to the section 1 by a tension applying device 19. A thrusting bar 15 is thrusted against the section 1 by a hydraulic cylinder 17, and a rotating body 11 is rotated in the direction of arrow M3. The section 1 is wound round the bending die 8 to form a small diameter bent part 28. At this time, the thrusting bar 15 and tension applying device 19 shift in the direction of arrow S. To bend large diameter bent parts 29, 30, the second and third bending dies 9, 10 are moved in the direction of Y1 or Y3, and an arm 22 is rotated in the direction of arrow M4 or M5 around an axis 23. |
