Storage and transportation of aluminium strip

B - Operations – Transporting – 21 – C

Patent

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Details

B21C 47/02 (2006.01) B21C 47/28 (2006.01) B21C 47/30 (2006.01)

Patent

CA 2430706

The invention is particularly directed to the problem of creep deformation in a coiled aluminium strip, which occurs during coiling and for a period thereafter. the problem arises because the profile of the strip across its width is not flat, and is in fact usually thicker in the middle than at the edges (positive crown). To cater for this, the invention provides that the spool (1) onto which the coil is wound is adapted to provide more support to the strip in the centre than at the edges. Various ways of achieving this are described; one example, as illustrated, is to make the central portion (2) of the spool (1) of greater diameter than the end portions (3) of the spool. A strip having a positive crown which is wound onto such a spool was found to exhibit significantly reduced creep strain, leading to reduced creep deformation.

L'invention concerne notamment le problème de la déformation de fluage dans une bande d'aluminium enroulée, cette déformation se produisant lors de l'enroulement de la bande et pendant un certain moment après. Ce problème réside en ce que le profil de la bande, sur la largeur de celle-ci, n'est pas plat, et en ce qu'il est, en fait, généralement plus épais dans le milieu que sur les bords (bombé positif) de la bande. Afin de remédier à ce problème, l'invention concerne une bobine (1) sur laquelle on enroule la bande d'aluminium et qui est conçue pour offrir plus de soutien à la bande dans la région du centre de celle-ci que sur les bords. L'invention concerne notamment divers moyens d'obtention d'un tel agencement: un exemple illustré montre que la portion centrale (2) de la bobine (1) est d'un diamètre supérieur à celui des portions d'extrémité (3). Une bande comprenant un bombé positif et que l'on enroule sur une telle bobine démontre une contrainte au fluage nettement réduite, entraînant ainsi une réduction de la déformation au fluage.

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