A bending device is provided, which can solve the problems of the previous art, which carries out two-dimensional or three-dimensional bending of a long metal blank having a closed cross section. The bending device comprises: (a) a first manipulator which constitutes a feeding means and feeds a hollow metal blank of closed cross section in its lengthwise direction, (b) a second manipulator which supports a first support means which is disposed at a first position and supports a metal blank while feeding it, a heating means which is disposed at a second position downstream of the first position in the blank feed direction and heats all or part of the circumference of the metal blank being fed, and a cooling means which is disposed at a third position downstream of the second position and cools a portion of the metal blank being fed, which was heated by the heating means, and (c) a third manipulator which constitutes a second support means which is disposed at a fourth position downstream of the third position in the feed direction of the metal blank and which applies bending moment to the heated portion of the metal blank while moving in a two-dimensional or three-dimensional direction and supporting at least one location of the metal blank being fed to bend the metal blank into a desired shape.
展开▼
