Method for necking thin wall metallic containers

Details Method for necking thin wall metallic containers Method for necking thin wall metallic containers

1981-11-30

1983-09-13

Gilden, Leon

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

72348, 72354, 72370, B21D 2200

Patent

active

044034938

ABSTRACT:
The present invention relates to methods for reducing the open end of drawn and ironed containers such as beverage cans (20). It is desirable to provide a maximum reduction in diameter of the open end (36) in order to reduce the quantity of material in the lid (24); but previous forming methods have resulted in localized buckling in the reduced diameter portion (58) and/or crumpling of the transition portion (60). The present invention has solved the localized buckling and crumpling problems by a step wherein both the reduced diameter portion (58) and the transition portion (60) are reformed within controlled limits to provide a new reduced diameter portion (82) and a new curvilinear transition portion (84). Principal uses include the manufacture of beverage cans.

REFERENCES:
patent: 3765351 (1973-10-01), Kybacki
patent: 3786957 (1974-01-01), Hilgenbrink
patent: 3964413 (1976-06-01), Saunders
patent: 3995572 (1976-12-01), Saunders
patent: 4173883 (1979-11-01), Boik

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