Method for manufacturing a bent member

A manufacturing method for a bent member from a metal blank using a manufacturing apparatus for a bent member,

• wherein the manufacturing apparatus for a bent member comprises:
• a feeding manipulator which is disposed at a first position so as to be able to move two-dimensionally or three-dimensionally and which can feed a hollow metal blank while changing the feed direction;
• a high-frequency heating coil which is positioned at a second position downstream of the first position in the feed direction of the metal blank and which heats all or a portion of the metal blank being fed and which forms a high-temperature area;
• a water cooling device which is disposed at a third position downstream of the second position in the feed direction of the metal blank and which cools the high-temperature area;
• and
• a bending manipulator which is disposed at a fourth position downstream of the third position in the feed direction of the metal blank so as to be able to move two-dimensionally or three-dimensionally and which together with the feeding manipulator imparts a bending moment to the high-temperature area of the metal blank by gripping at least one location of the metal blank being fed and thereby bends the metal blank into a desired shape,
• the method comprises the step of:
• changing an angle of installation of the high-frequency heating coil in accordance with the changing of the feed direction.