Method and apparatus for forming box-shaped sheet metal ducts

Details Method and apparatus for forming box-shaped sheet metal ducts Method and apparatus for forming box-shaped sheet metal ducts

B - Operations, Transporting

21

D

B21D 5/00 (2006.01) B21C 37/06 (2006.01) B21C 37/10 (2006.01) B21D 5/04 (2006.01) B21D 39/02 (2006.01)

Patent

CA 2060032

An improved method and apparatus for forming box-shaped sheet metal ducts with Pittsburgh-type seams. The improved method is a continuous process in which the sheet metal is fed from an uncoiler, and after straightening and notching, the leading edge is fed into a single apparatus that performs all of the remaining forming functions. In this single apparatus, the leading edge of the material is formed into the male portion of the Pittsburgh seam, after which the box is formed and then the female portion of the Pittsburgh seam is formed and the material sheared to complete the box section. Using this improved method eliminates the moving of separate parts from one station to another, thereby improving the efficiency of the forming operation and the quality of the resulting box section.

L'objet de la présente invention est une méthode améliorée pour le formage de conduits de section rectangulaire avec joint à agrafe Pittsburgh. La méthode améliorée consiste en un procédé d'assemblage continu dont l'alimentation en tôle est assurée par un dérouleur; après dressage et formation des rives de la tôle, le bord d'attaque est introduit dans une machine qui accomplit toutes les autres opérations de formage. € l'intérieur de cette machine, le bord d'attaque de la tôle reçoit la configuration mâle du joint à agrafe Pittsburgh, le conduit reçoit sa forme rectangulaire, le bord femelle du joint à agrafe Pittsburgh est formé, et la tôle est découpée à la longueur voulue. Cette nouvelle méthode permet d'éliminer la manipulation et le déplacement de pièces détachées, ce qui se traduit par un rendement accru et un produit de meilleure qualité.

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