Subsequent working process for a tin sealing cap

Details Subsequent working process for a tin sealing cap Subsequent working process for a tin sealing cap

B - Operations, Transporting

21

D

B21D 51/44 (2006.01)

Patent

CA 2155869

A process is disclosed for subsequently working a tin sealing cap, in particular for beverage cans. A ring-shaped area (20, 24) of the top surface (10) of the cap that is radially contiguous to the bend between the top surface of the cap and the core groove is squeezed so that material from this ring-shaped area is pushed outwards through the adjacent bend (11) substantially in the radial direction. For that purpose, a coining surface (4 to 6, 30, 31) is used with a wedge-shaped outward and upward slant (25) that acts from the outside on the top surface of the cap.

Selon un procédé de façonnage ultérieur d'un couvercle métallique, notamment pour boîtes de boissons, une zone annulaire (20, 24) de la surface supérieure (10) du couvercle adjacente dans le sens radial au coude formé entre la surface supérieure du couvercle et une rainure intérieure est comprimée de façon à repousser radialement le matériau dont est constituée cette bande annulaire sensiblement radialement vers l'extérieur à travers le coude adjacent (11). On utilise à cet effet une surface d'estampage (4 à 6, 30, 31) radialement inclinée en forme de coin (25) vers l'extérieur et vers le haut qui agit de l'extérieur sur la surface supérieure du couvercle.

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