Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Reexamination Certificate
1996-08-12
2001-10-23
Larson, Lowell A. (Department: 3725)
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
Reexamination Certificate
active
06305210
ABSTRACT:
This invention relates to sheet metal can bodies and to methods and apparatus for fabricating sidewall elongated one-piece can bodies from flat-rolled sheet metal. More specifically, this invention is concerned with preforming sheet metal at the closed end of a cup-shaped work product so as to enable effective and efficient profiling of a decreased diameter base support for the closed end of a sidewall elongated can body which is suitable for pressurized beverage packs. In particular, this invention provides for profiling the closed end of a can body of selected tensile strength flat-rolled steel, free of sheet metal buckling during such profiling, while maintaining desired bottom wall thickness gauge so as to avoid bulging or implosion at such closed end during usage.
Difficulties in consistently fabricating flat-rolled sheet metal one-piece can bodies to provide satisfactory closed end profiling for pressurized beverage packs have long been associated with ironed sidewall one-piece can bodies. The height of a sidewall-ironed one-piece can body for a pressurized beverage pack significantly exceeds can body diameter; and, a significant percentage of that sidewall height is achieved by sidewall ironing. However, fabricating a one-piece can body with acceptable sheet metal economies to provide an ironed sidewall, and a desired closed end configuration which does not require reforming after can body fabrication, has continued to present significant challenges to the canmaking industry notwithstanding the billions of pressure pack beverage cans manufactured and distributed annually in recent years.
REFERENCES:
patent: 3998174 (1976-12-01), Saunders
patent: 4289014 (1981-09-01), Maeder et al.
patent: 4407149 (1983-10-01), Smith et al.
patent: 4584859 (1986-04-01), Saunders
patent: 4685322 (1987-08-01), Clowes
patent: 5325696 (1994-07-01), Jentzsch et al.
Dalrymple William H.
Saunders Cleo
Saunders William T.
Larson Lowell A.
Saunders Cleo
Shanley & Baker
Weirton Steel Corporation
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