Method of necking an impact extruded metal container

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 51/26 (2006.01)

Patent

CA 2206483

A method of forming an elongated, narrowed neck (225) on an impact extruded metal container, in which a larger portion is trimmed from the open endof the container than is necessary merely to produce a straight unwrinkled edge.The trimmed part (111a, 111b) is sufficiently long that the metal at the new edge (112a, 112b) formed by trimming comprises substantially more formable metal than the metal which would have been present at the edge produced by normal trimming. The increased formability occurs because excess impurities which migrate to the open edge of the container are largely removed by the deep trim. The method is further assisted by trimming the end of the neck again partway through a series of neck-forming dies (120), and by using compressed air in the first few dies to aid in ejecting the containers from the dies.

Cette invention concerne une méthode de formage d'un col allongé et rétreint (225) dans un récipient métallique obtenu par filage à choc, méthode selon laquelle on rogne une portion plus grande du bout ouvert du récipient que ce qui est strictement nécessaire pour produire une rive droite non plissée. La partie rognée (111a, 111b) est suffisamment longue pour que le métal à la nouvelle rive (112a, 112b) obtenue comporte sensiblement plus de métal qu'avec un rognage normal. La formabilité accrue découle du fait que les impuretés qui migrent vers le bout ouvert du récipient sont largement éliminées par le rognage profond. Le résultat est amélioré davantage en raison du rognage du bout du col en cours de rétreint dans une série de matrices de rétreint (120) et de l'utilisation d'air comprimé dans les quelques premières matrices pour aider à l'éjection des récipients.

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