Methods for necking-in sheet metal can bodies

Details Methods for necking-in sheet metal can bodies Methods for necking-in sheet metal can bodies

1974-07-22

1976-06-22

DiPalma, Victor A.

72370, 113120R, B21D 5100

Patent

active

039644138

ABSTRACT:
Die-forming method for forming necked-in flanging metal on a light gauge drawn and ironed can body with a longitudinally extended transition zone between the necked-in portion and the original can body diameter portion while avoiding wrinkling or puckering of the flanging metal. In an initial stage of the die-forming operation, sheet metal contiguous to the peripheral edge is strengthened by turning such edge inwardly about a small radius. The strengthening member formed exerts a lateral restraint during a second stage of the die-forming operation in which the flanging metal and longitudinally extended transition zone are formed. The die-forming operation is carried out from a single end of the can body using a loose fitting inner die which is readily removable from the working end after reducing the diameter of such end.

REFERENCES:
patent: 718379 (1903-01-01), Painter
patent: 865257 (1907-09-01), Kohl
patent: 3581542 (1971-06-01), Wahler
patent: 3687098 (1972-08-01), Maytag
patent: 3763807 (1973-10-01), Hilgenbrink

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