Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1986-10-02
1987-11-10
Kittle, John E.
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
413 8, 413 56, 413 62, B21D 2200, B21D 5144, B21D 5146
Patent
active
047048875
ABSTRACT:
The disclosure relates to a novel shell such as used in the manufacture of can ends, and to a method and tools for making such a shell. A non-circular blank having rounded corners is cut from thin metal. The blank is oblong in a direction transverse to the grain of the metal. A first set of tools separates the blanks and forms a substantially flat central panel and an upward-extending chuck wall about the edge of the panel to produce a partially formed shell. The junction area between said panel and said chuck wall has a relatively large radius of curvature at this time. A second set of tools forms in the blank a lip extending outward from the upper end of the chuck wall and generally parallel to said panel; then the panel and the chuck wall are separately gripped, followed by relative movement between the panel and the chuck wall while wrapping the junction area around a forming punch to form a panel wall in said junction area extending upward from the inner part of said chuck wall. Then the lip is formed into a curl edge section which ends in an inner curl diameter that is round and concentric with the chuck wall, and has progressively lesser radii of curvature from upper end of the chuck wall to the inner curl diameter. The resulting shell is characterized by a curl diameter being round and concentric with the chuck wall and essentially uniformly spaced therefrom, and by having an essentially constant thickness throughout the central panel, the panel wall and chuck wall and the curved section therebetween.
REFERENCES:
patent: 3434325 (1969-03-01), Podesta et al.
patent: 3952677 (1976-04-01), Hartman et al.
patent: 3957005 (1976-05-01), Heffner
patent: 4005665 (1977-02-01), Nishihara et al.
patent: 4157693 (1979-06-01), Openchowski et al.
patent: 4215795 (1980-08-01), Elser
patent: 4382737 (1983-05-01), Jensen et al.
patent: 4448322 (1984-05-01), Kraska
patent: 4561280 (1985-12-01), Bachmann et al.
patent: 4571978 (1986-02-01), Taube et al.
patent: 4587826 (1986-05-01), Bolso, Jr. et al.
patent: 4603571 (1986-08-01), Wessels
patent: 4606472 (1986-08-01), Taube et al.
Bachmann Henry C.
Brown Omar L.
Fraze Ermal C.
Gregg James R.
Wynn David K.
Dayton Reliable Tool & Mfg. Co.
Kittle John E.
Ryan Patrick J.
LandOfFree
Method and apparatus for making shells for can ends does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for making shells for can ends, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for making shells for can ends will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1060307