To provide a method and an apparatus for pushing-through bending by which the position of the outer peripheral surface of a three-dimensional shape to be worked is controllable.
By deciding the track of a long size material having the three-dimensional shape which is formed by an offset which is a deviation between the centroid of an opening 107a of a movable die 107 and the centroid of an opening 103a of a fixed die on the plane on which the fixed die 103 is provided, the distance between the dies which is a distance between the centroid of the opening of the fixed die and the centroid of the opening of the movable die on an axis which is crossed orthogonally to a plane on which the fixed die is provided and passed through the centroid of the opening of the fixed die, a die angle which is an inclination angle of the movable die to the plane on which the movable die is provided and a die twist angle which is the rotation angle of the movable die around an axis which is crossed orthogonally to the plane on which the movable die is provided and passed through the centroid of the opening of the movable die and deciding the direction of the bending of the long material having the three-dimensional shape which is formed by a die offset angle of the movable die which is an angle in the offset direction of the movable die on the plane on which the fixed die of the movable die are provided is decided.
FUKUOKA SHINGORO
ICHIYANAGI TAKESHI
SAITO HIROMI
Nobushige Samejima
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