Method for precision bending of a sheet of material and slit...

B - Operations – Transporting – 21 – D

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Details

B21D 28/26 (2006.01) B21D 5/00 (2006.01) B21D 5/16 (2006.01) B31B 1/26 (2006.01)

Patent

CA 2419225

A method for precision bending of a sheet of material (31, 41, 61, 91, 231) along a bend line (35, 45, 62-66, 96, 235) and the resulting sheet are disclosed. A method includes a step of forming and longitudinally extending slits (33, 43, 68, 92, 233) through the sheet of material in axially spaced relation to define bending webs (37, 47, 71, 72, 106, 237), forming stress reducing structures such as enlarged openings (39, 49, 69, 73) or transversely extending slits (239) at each of adjacent ends of pairs of slits in order to reduce crack propagation across the bending webs. In another aspect, the elongated slits (43, 68, 92, 233) are formed with pairs of longitudinally extending slit segments (51, 52; 74, 76; 98, 99; 127) proximate to and on opposite sides of and substantially parallel to the desired bend line. Longitudinally extending slit segments further are connected by at least one intermediate transversely extending slit segment (53, 77, 101, 128). Sheets of slit material suitable for bending also are disclosed.

L'invention concerne un procédé pour plier avec précision une feuille de matériau (31, 41, 61, 91, 231) le long d'une ligne de pliage (35, 45, 62-66, 96, 235), et la feuille obtenue par ce procédé. Un procédé consiste à former longitudinalement des fentes (33, 43, 68, 92, 233) à travers la feuille de matériau dans une relation d'espacement axial pour délimiter des bandes de pliage (37, 47, 71, 72, 106, 237); et à former des structures de réduction des contraintes, telles que des ouvertures agrandies (39, 49, 69, 73) ou des fentes transversales (239) à chacune des extrémités adjacentes de paires de fentes afin de réduire la propagation d'une fissure à travers les bandes de pliage. Dans un autre aspect, les fentes allongées (43, 68, 92, 233) sont formées de paires de segments à fentes s'étendant longitudinalement (51, 52; 74, 76; 98, 99; 127) à proximité ou sur des côtés opposés de la ligne de pliage désirée et sensiblement parallèles à celle-ci. Des segments à fentes s'étendant longitudinalement sont en outre raccordés par au moins un segment à fentes intermédiaire s'étendant transversalement (53, 77, 101, 128). L'invention concerne en outre des feuilles de matériau à fentes qui conviennent pour le pliage.

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