| 摘要 |
Apparatus and method for producing bends in tubes, including a bending die assembly having a fixed die section that is rigidly mounted to a support member and at least one a movable die section that is movable relative to the fixed section. When used to make "wrinkle" bends the die assembly includes a pair of moveable die section that are moveable relative to the fixed die section and relative to each other along a predetermined path. The movable die section or sections are supported for movement in a common plane and include camming pins engageable with slots formed in the support member, such that the engagement of the pins with the associated slots define paths of movement for the die sections. When used to make "wrinkle" bends, the fixed die section and movable die sections define wrinkle receiving recesses. After a bend has been made in the tube, the movable die sections move in an advancing direction and towards each other in order to disengage the inside of the bent tube and are then moved to a retracted position, in order to perform a subsequent bend step. In an alternate embodiment, the die assembly includes a fixed section and a single movable section and is intended to perform mandrel type bends. In this alternate embodiment, at the conclusion of a bending step, the movable die section is advanced and moves towards a centerline, thereby disengaging the inside of the tube and allowing the tube to be rotated about its axis in order to position another portion of the tube for a subsequent bend.
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