Curved pipe manufacturing method and an apparatus for carrying out same.

摘要

The present invention relates to a curved pipe manufacturing method comprising the steps of: normally inserting a curved mandrel (7) into a curved cavity (4) of a fixed die (1) having an entrance opening (2) and an exit opening (3), the curved mandrel (7) being attached to the distal end of a movable block (6); forming a curved pipe by pressing a work (5), with a presser rod (15) through the entrance opening (2) of the curved cavity (4) into a curved space defined by the surface of the curved cavity (4) and the mandrel (7); turning the movable block (6) to one direction so that an ejecting rod (8) provided at the base side of the movable block (6) and concentrically integrated with the mandrel (7) ejects the mandrel (7) together with the curved pipe from the entrance opening (2) of the fixed die (1); advancing a movable chuck (22) provided outside the entrance opening (2) for chucking only the curved pipe; turning the movable blok (6) to another direction opposite to the one direction so as to return only the mandrel (7) in the curved cavity (4) of the fixed die (1); and retracting the movable chuck (22) for removing the curved pipe. An apparatus for carrying out the curved pipe manufacturing method is also provided.