Sheet of cold material and method and tool for its manufacture

Details Sheet of cold material and method and tool for its manufacture Sheet of cold material and method and tool for its manufacture

B - Operations, Transporting

21

D

B21D 13/10 (2006.01) E04C 2/32 (2006.01)

Patent

CA 2672065

A sheet of cold rolled material having on both of its surfaces rows of projections (11) and rows of depressions (12), the projections (11) on one surface corresponding with the depressions (12) on the other surface, the relative positions of the projections (11) and depressions (12) being such that lines drawn on a surface of the sheet between adjacent rows of projections (11) are non-rectilinear, the sheet having a base gauge G, wherein each projection (11) has a substantially continuous region of peak plastic strain at, toward or about its apex and/or is thinned by no more than 25% of its base gauge G. Methods of forming the sheet material and tools for forming the sheet material are disclosed.

L'invention porte sur une tôle de matériau laminé à froid ayant, sur ses deux surfaces, des rangées de saillies (11) et des rangées de creux (12), les saillies (11) sur une surface correspondant aux creux (12) sur l'autre surface, les positions relatives des saillies (11) et des creux (12) étant telles que des lignes tracées sur une surface de la tôle entre des rangées adjacentes de saillies (11) ne sont pas rectilignes, la tôle ayant une épaisseur de base G, chaque saillie (11) ayant une région sensiblement continue de déformation plastique de pic au niveau, en direction ou autour de son sommet et/ou n'est pas amenuisée de plus de 25 % de son épaisseur de base G. L'invention porte également sur des procédés de fabrication de la tôle de matériau et sur les outils pour fabriquer la tôle de matériau.

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