Metal deforming – By application of fluent medium – or energy field – Using fixed die
Patent
1996-01-04
1997-11-18
Jones, David
Metal deforming
By application of fluent medium, or energy field
Using fixed die
72 56, 72 84, B21D 2614, B21D 1912
Patent
active
056875991
ABSTRACT:
A can is formed including a body having a bottom wall with an electromagnetically formed contoured sidewall extending therefrom and a necked end. The open end of the sidewall is first pre-necking to form a reduced diameter section. Thereupon, the sidewall is electromagnetically formed to form an outwardly expanding contoured sidewall. The can is then subjected to a necking process proximate the reduced diameter section to achieve a further reduced diameter conical necked end. The necking process may be performed by radially inwardly advancing an external forming member into contact with the sidewall against counterpressure provided by a pair of relatively axially displaceable inner members disposed within the can interior. Alternatively, the necking process may be spin flow necking.
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Arfert Horst F.
Cudzik Daniel F.
Donaldson Roger H.
Foetisch Robert P.
Jones David
Lyne, Jr. Robert C.
Reynolds Metals Company
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