Method for the production of metal closures

Details Method for the production of metal closures Method for the production of metal closures

B - Operations, Transporting

21

D

B21D 45/04 (2006.01) B21D 43/16 (2006.01) B21D 43/18 (2006.01) B21D 51/44 (2006.01)

Patent

CA 2602703

The present invention relates to a method and tooling suitable for handling closure blanks (5) having an external radius (6) at their cut edge at production speeds of about (1200) closures per minute. The external radius (6) limits formation of ~angel hair~ (a common problem in metal closure production). However, reversing the external radius causes a problem, when producing metal closures having a conventional inward curl at their peripheral edge. Accordingly, the invention proposes a modified curling rail (40) having a first portion (41) to uncurl the external curl (6) on the closure blank (5) and a second portion (45) to urge the straightened side wall of the closure blank (5) towards an inward curl.

La présente invention concerne un procédé et un outillage permettant le traitement d'ébauches de fermetures (5) comprenant un rayon extérieur (6) au niveau de leur bord de coupe à des vitesses de production d'environ 1200 fermetures par minute. Le rayon extérieur (6) permet de limiter la formation de "cheveux d'ange", problème fréquemment rencontré dans la production de fermetures métalliques. Toutefois, le renversement du rayon extérieur cause un problème pendant la production de fermetures métalliques comprenant un bord roulé vers l'intérieur classique en périphérie. Par conséquent, l'invention propose un rail de roulage de bord modifié (40) comprenant une première partie (41) destinée à redresser le bord roulé extérieur (6) sur l'ébauche de fermeture (5) et une seconde partie (45) destinée à pousser la paroi latérale redressée de l'ébauche de fermeture (5) en direction d'un bord roulé vers l'intérieur.

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