| 摘要 |
PROBLEM TO BE SOLVED: To provide a bending device having a simple structure capable of easily and continuously performing two-dimensional and three-dimensional bending. SOLUTION: In this device, the fixing end side F of the hollow double tube P is constrained with a bending die 1 and a fixing die 2, the middle part of the hollow double tube P is slidably held with a shoe 3 and a pressing die 4 behind the bending die 1 and the fixing die 2, an inner core bar 5 is inserted into the inner tube P1 and a tubular core bar 6 is inserted between the inner tube P1 and an outer tube P2 from the opening end side of the hollow double tube P, and the hollow double tube P is bent by turning the bending die 1 in the bending direction. In this case, a pressing member 8, striking in common to the opening end surface of the inner tube P1 and the outer tube P2, is provided. The pressing member 8 and a chuck 7, fixing to the peripheral surface of the outer tube P2 at the opening end side of the hollow double tube P, are combined via a guiding long hole 10 formed in the tubular core bar 6, and the tubular core bar 6 is turned to the inner core bar 5. |
