Apparatus and method for ram bending of tube material

B - Operations – Transporting – 21 – D

Patent

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B21D 7/06 (2006.01)

Patent

CA 2678716

A novel apparatus and method for press-bending a tube material, simultaneously achieving three features that are bending with a large bend radius not requiring a large-scale facility and a die, bending less likely to produce wrinkles and buckling inside a bend, and bending with high productivity. The press-bending apparatus bends a tube material at three points by a punch (12) and a set of rolls (13, 13). The punch (12) has a groove (12a) with a width greater than that of a circular tube (11). The set of rolls (13, 13) are supported by a base (14). The rolls (13, 13) are movable on the base (14) in the direction separating from each other while being in contact with the punch (12). The base (14) has a hollow (14a), and the punch (12) that descends and the circular tube (11) that is bent as the punch (12) descends are allowed to move in the hollow (14a) while the circular tube (11) is bent.

L'invention concerne un nouvel appareil et un nouveau procédé pour cintrer à la presse un matériau tubulaire, permettant d'obtenir simultanément trois caractéristiques qui sont un cintrage avec un grand rayon de cintrage ne nécessitant pas d'installation de grande dimension ni de matrice, un cintrage moins susceptible de produire des plis et un gondolement dans une courbure, et un cintrage avec une productivité élevée. L'appareil de cintrage à la presse cintre un matériau tubulaire en trois points par un poinçon (12) et un ensemble de rouleaux (13, 13). Le poinçon (12) a une rainure (12a) d'une largeur plus grande que celle d'un tube circulaire (11). L'ensemble de rouleaux (13, 13) sont portés par une base (14). Les rouleaux (13, 13) sont mobiles sur la base (14) dans la direction les séparant les uns des autres tout en étant en contact avec le poinçon (12). La base (14) présente un creux (14a) et le poinçon (12), qui descend, et le tube circulaire (11), qui est cintré à mesure que le poinçon (12) descend, peuvent se déplacer dans le creux (14a) pendant que le tube circulaire (11) est cintré.

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