B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 51/26 (2006.01) B21D 15/02 (2006.01)
Patent
CA 2304660
A method and apparatus for mechanically reshaping and/or forming textured features in the side wall of metal can bodies (5) in which a can body is mounted on a profiled mandrel (15) and rolled along a second madrel or rail (25), which is also profiled. The tools are made from hard material but either the mandrel carrying the can or the second mandrel or rail is resiliently mounted. This mounting has been found to facilitate control of the depth of the profiled features formed in the can body. In particular, the problem of depth variability which will arise due to expansion of the machine and tooling in normal running conditions, or variability in thicknesses in the can body is avoided. Typically, the can body is clamped between complementary unformed regions on the tools during forming so as to prevent wrinkling or localised thinning of the can side wall.
L'invention se rapporte à un procédé et à un appareil permettant de reprofiler la paroi latérale de corps (5) de boites métalliques et/ou d'y former des caractéristiques de texture. Ledit procédé consiste à monter le corps de boite sur un mandrin (15) profilé et à le rouler le long d'un second mandrin ou rail (25), également profilé. Les outils utilisés sont fabriqués dans un matériau dur mais le mandrin supportant la boite, ou le second mandrin ou rail, est monté sur support élastique. Ce type de montage permet de réguler facilement la profondeur des motifs caractéristiques profilés que l'on forme sur le corps de la boite. Il est notamment possible de résoudre le problème de variabilité de la profondeur qui résulte de la dilatation de la machine et des outils dans des conditions normales de fonctionnement, ou de variabilité de l'épaisseur du corps de la boite. Généralement, on bloque le corps de la boite entre deux régions brutes complémentaires des outils pendant l'opération de formage de façon à éviter le plissement ou l'amincissement localisé de la paroi latérale de la boite métallique.
Knight Philip John
Monro Stuart Alexander
Crown Cork & Seal Technologies Corporation
Fetherstonhaugh & Co.
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