Die for use in die-necking of a metal can body and method using

Details Die for use in die-necking of a metal can body and method using Die for use in die-necking of a metal can body and method using

1996-06-25

1998-01-27

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

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

72348, B21D 2200, B21D 2221

Patent

active

057111782

ABSTRACT:
A die for use in a stage of a multi-stage die-necking process of a metal body such as a beverage can, has a surface around a center-line. The die surface, seen in longitudinal section through the center-line, has a profile which includes in direct succession a feed-in zone, an intermediate zone and a neck zone. The intermediate zone has, as well as a contact part, a relatively steep part in which tangents to the die surface include an angle .alpha. to the center-line greater than .alpha..sub.n, where .alpha..sub.n is the neck angle between the necked part following die-necking and the center-line of the body. The presence of this non-contact steep part reduces the axial force needed in the die-necking.

REFERENCES:
patent: 3771476 (1973-11-01), Heinle
patent: 3964413 (1976-06-01), Saunders
patent: 3995572 (1976-12-01), Saunders
patent: 4403493 (1983-09-01), Atkinson
patent: 5355710 (1994-10-01), Diekhoff
European Search Report, Feb. 29, 1996.

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