Metal deforming – By application of fluent medium – or energy field – By kinetic energy of fluid or field
Patent
1991-03-27
1991-10-22
Larson, Lowell A.
Metal deforming
By application of fluent medium, or energy field
By kinetic energy of fluid or field
723421, B21D 2614
Patent
active
050584081
ABSTRACT:
This invention provides a method of bulging at least a portion of a sidewall of a drawn or drawn and ironed aluminum container body. The method involves an initial thermal treatment step prior to bulging. The thermal treatment is provided to that portion of the sidewall of the container that is to be bulged and is sufficient to reduce the yield strength of that portion of the sidewall about 20% without substantially adversely affecting the yield strength of the bottom wall of the container. After thermal treatment, at least a portion of the thermally treated sidewall is bulged at a circumferential strain greater than about 5% to provide container shape.
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Cargnel Robert A.
Douds E. Scott
Gunkel Ronald W.
Leftault, Jr. Charles J.
Aluminum Company of America
Larson Lowell A.
O'Rourke William J.
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