Method for producing from a metal sheet a hollow profile...

Details Method for producing from a metal sheet a hollow profile... Method for producing from a metal sheet a hollow profile...

B - Operations, Transporting

21

D

B21D 5/01 (2006.01) B21C 37/08 (2006.01) B21C 37/16 (2006.01)

Patent

CA 2537664

The invention relates to a method for producing hollow profiles provided with different cross sections along the length thereof. Said profiles are shaped in a die from one piece of cut metal sheet (5, 6, 7). According to said invention, a convex or concave rounding produced on the edges of a longitudinal section (8a, 8b, 9a, 9b) results in material excess or material shortage in the transition regions (8, 9), thereby preventing the material thinning or thickening in said transition regions (8, 9) during forming.

L'invention concerne un procédé pour produire des profilés creux présentant, sur leur longueur, des sections transversales différentes. Ces profilés sont formés dans une matrice à partir d'une seule pièce de tôle plate découpée (5, 6, 7). Selon l'invention, un arrondissage convexe ou concave réalisé au niveau des arêtes de coupe longitudinales (8a, 8b, 9a, 9b) provoque un excédent ou un déficit de matière dans les zones de jonction, ce qui permet d'éviter, lors du formage, l'apparition d'épaississements ou d'amincissements de matière dans les zones de jonction (8, 9).

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