VERFAHREN ZUR HERSTELLUNG EINES HOHLNIETES ZUR BEFESTIGUNG EINER AUFREISSFLASCHE AM DECKELSPIEGEL EINES AUFREISSDECKELS AN DOSEN

1487267 Making tubular rivets; riveting; stamping VEREINIGTE ALUMINIUM-WERKE AG 26 Feb 1975 [1 March 1974] 8130/75 Addition to 1399557 Headings B3A B3Q and B3U A method of making a tubular rivet 16, Fig. 4, integral with a sheet 2, Fig. 1, of metal comprises deforming a circular region of the sheet using a punch 1 to form a nip and a die 4 to form a dome 19 in the cup and an annular groove 5 at the edge of the circular region in a first operation, and forming a shank 6 and head 29, of the rivet by deforming the dome using a punch and die and leaving the annular groove around the formed shank at its original depth or at a depth which is reduced at least in localized zones. A panel 14 in a can lid is riveted to a gripping tongue 15 by the rivet 16 in a further operation by deforming the rivet heat 29 using a riveting punch 25. A region is provided in a setter 26 for receiving the ananular groove 5 during the riveting operation.