Method and device for rounding bushings

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 53/10 (2006.01) B21D 51/10 (2006.01)

Patent

CA 2220097

The invention concerns a rounding device (10) comprising two shaping dies (12, 14) with shaping chambers (22, 24) in order to round a sheet bar (26) about a core (16). The peripheral lengths of the two shaping chambers (22, 24) are each longer than half the can length. During a shaping step, the core (16) penetrates a first shaping chamber (22) by a depth which is greater than the can radius. The sheet bar (26) is thus shaped in the form of a U. In an intermediate shaping stage, an auxiliary core (18) is placed on the core (16) such that, as the second shaping die (14) moves downwards, only the ends of the U-legs of the sheet bar blank (26) are shaped arcuately. When the auxiliary core (18) and part (20) of the first shaping die (12) have been removed, the final can shaping process occurs, in which the second shaping die (14) likewise travels over the centre of the can. The three-stage rounding method enables cans to be rounded highly accurately and carefully.

Un dispositif de cintrage (10) comporte deux poinçons de formage (12, 14) munis de chambres de formage (22, 24), se présentant de manière à effectuer un cintrage d'un flan (26) autour d'un noyau (16). Chacune des longueurs périphériques des deux chambres de formage (22, 24) est supérieure à la moitié de la périphérie de la boîte. Au cours d'une étape de préformage, le noyau (16) pénètre dans une première chambre de formage (22) sur une distance supérieure au rayon de la boîte. Le flan (26) est ainsi façonné en U. Au cours d'une étape de formage intermédiaire, un noyau auxiliaire (18) est monté sur le noyau (16), de manière à ce que lorsque le second poinçon de formage (14) descend, seules les extrémités des branches du U de l'ébauche de flan (26) soient cintrées en arc de cercle. Après éloignement du noyau auxiliaire (18) et d'une partie (20) du premier poinçon de formage (12), a lieu l'étape de formage final de la boîte, au cours de laquelle le second poinçon de formage (14) passe également au-dessus du centre de la boîte. Ce procédé de cintrage en trois étapes permet de cintrer des boîtes de manière très précise, sans les altérer.

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