Manufacturing apparatus and method of spiral duct including...

B - Operations – Transporting – 21 – D

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B21D 11/06 (2006.01) B21D 11/00 (2006.01)

Patent

CA 2723866

Provided is a manufacturing method of a spiral duct including an elbow. The manufacturing method includes: bending projecting wave portions of metal plate members upward by a ball caster, the metal plate members being cut in such a manner that a straight lines and waves are formed; transferring the metal plate members using a pair of transfer rollers which are rotated by a first motor installed in a manufacturing apparatus of a spiral duct including an elbow; pressing a single folded portion and a double folded portion of the metal plate members using upper and lower pressing rollers while the transferred metal plate members are rolled into a circular shape by a joint jig; and cutting the elbow formed by the manufacturing apparatus using upper and lower cutters. According to the invention, an elbow curved at a gentle angle can be formed, and the projecting wave portions of the metal plate members are bent so as to form the elbow. Therefore, a fluid can smoothly flow along the curved portion of the elbow. Further, as the elbow is formed by consecutive processes, it is possible to increase productivity.

La présente invention concerne un procédé de fabrication de conduit hélicoïdal comprenant un coude. Le procédé de fabrication comprend : le cintrage de parties ondulées faisant saillie déléments de tôle vers le haut par une roulette sphérique, les éléments de tôle étant découpés de sorte que des lignes droites et des ondulations soient formées ; le transfert des éléments de tôle au moyen dune paire de cylindres de transfert qui sont entraînés en rotation par un premier moteur installé dans un appareil de fabrication dun conduit hélicoïdal comprenant un coude ; la compression dune partie simple repliée et dune partie double repliée des éléments de tôle au moyen de cylindres presseurs supérieur et inférieur lorsque les éléments de tôle sont laminés en une forme circulaire par un dispositif de serrage de joints ; et la découpe du coude formé par lappareil de fabrication au moyen de lames supérieure et inférieure. Selon linvention, un coude recourbé à un angle faible peut être formé, et les parties ondulées faisant saillie des éléments de tôle sont cintrées pour former le coude. Par conséquent, un fluide peut sécouler sans interruption le long de la partie courbe du coude. En outre, étant donné que le coude est formé par des opérations successives, il est possible daccroître la productivité.

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