B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 26/02 (2006.01) B21D 22/16 (2006.01) B21D 51/16 (2006.01)
Patent
CA 2555049
A method of forming a bottle-shaped or other contoured metal container by subjecting a hollow metal preform having a closed end to internal fluid pressure to cause the preform to expand against the wall of a die cavity defining the desired shape, and advancing a punch into the die cavity to displace and deform the closed end of the preform either before or after expansion begins but before it is complete. The pressure-subjecting step is performed by simultaneously subjecting the preform in the die cavity to independently controllable internal and external positive fluid pressures and varying the difference between them to control strain rate.
Gong Kevin
Hamstra Peter
Macewen Stuart
Mallory Robert W.
Moulton James D.
Kirby Eades Gale Baker
Novelis Inc.
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