Method for producing expanded metal profiles and profile...

B - Operations – Transporting – 21 – D

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B21D 47/02 (2006.01) B21D 5/08 (2006.01) E04C 3/09 (2006.01)

Patent

CA 2568586

A method for producing expanded metal profiles, consisting of subjecting a metal strip of width less than the development of the profile to be produced to the following operations: - forming longitudinal slits in at least that longitudinal band which is to form the central web of the profile, - bending the edges of the slits, - profiling said strip, - transversely stretching that band containing the slits, - pressing areas of said central web in correspondence with said stretched band to displace them external to the plane of said web, characterised by subjecting the bent edges to drawing to obtain radiused edging having the tangent to the free edge forming an angle not less than 900 to the surface of the strip.

La présente invention a trait à un procédé pour la production de profilés métalliques expansés, comprenant la traitement d'une bande métallique de largeur inférieure au développement du profilé à produire par les opérations suivantes: La formation de fentes longitudinales dans au moins une bande longitudinale destinée à former l'âme centrale du profilé; le cintrage des bords des fentes; le découpage au profil de ladite bande; l'étirage transversale de la bande contenant les fentes; le formage par pression de zones de ladite âme centrale en correspondance avec ladite bande étirée pour leur déplacement vers l'extérieur du plan de ladite âme, caractérisé en ce par l'étirage des bords cintrés pour l'obtention de bordure arrondie, la tangente au dit bord cintré formant un angle égal ou supérieur à 90· avec la surface de la bande.

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