Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1996-01-02
1998-07-07
Simmons, David A.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148697, 148696, 148695, 148688, 148566, 148570, 72 56, C22F 100
Patent
active
057762708
ABSTRACT:
A method for reforming the generally cylindrical sidewalls of aluminum containers is disclosed. The method produces highly expanded and/or contoured container sidewalls which provide a distinctive appearance in comparison with cylindrical containers having straight sidewalls. Multiple expansion steps are used to expand the sidewall to a diameter substantially greater than the initial diameter of the cylindrical starting container. The sidewalls are thermally treated prior to expansion, for example, by annealing to reduce or eliminate residual stresses and work hardening. The sidewall thickness of the cylindrical starting container is preferably selected in order to maximize the total amount of sidewall expansion that can be achieved.
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Aluminum Company of America
Elve M. Alexandra
Simmons David A.
Towner Alan G.
Trempus Thomas R.
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