Method and apparatus for making shells for cans

Details Method and apparatus for making shells for cans Method and apparatus for making shells for cans

1984-01-16

1986-02-04

Husar, Francis S.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72336, 413 56, B21D 2200

Patent

active

045677468

ABSTRACT:
The disclosure relates to method and tools for making shells used in the manufacture of can ends. A first set of tools makes blank pre-forms having a substantially flat central panel and an upward-extending chuckwall about the edge of the panel. The junction area between the panel and the chuckwall has a relatively large radius of curvature at this time. A second set of tools forms on the blanks a lip extending outward from the upper end of the chuckwall and generally parallel to said panel; then the panel and the chuckwall are separately gripped, followed by relative movement between the panel and the chuckwall while wrapping the junction area around a forming punch to form a panel wall in the junction area extending upward from the inner part of the chuckwall. Then the lip is formed into a curl edge section which ends in an inner curl diameter that is round and concentric with the chuckwall. Methods and apparatus are disclosed for (a) separating the pre-forms at the first tools and then transferring them individually to the second tools, or (b) partially separating the pre-forms at the first tools and using the advancing sheet metal stock to carry the pre-forms to the second tools. Also disclosed are various tool layout modifications for use in different types of single acting or double acting reciprocating presses.

REFERENCES:
patent: 3537291 (1967-10-01), Hawkins
patent: 3948162 (1976-04-01), Numba
patent: 3952677 (1976-04-01), Hartman et al.
patent: 3957005 (1976-05-01), Heffner
patent: 4026226 (1977-05-01), Hahn et al.
patent: 4157693 (1979-06-01), Openchowski et al.
patent: 4215795 (1980-08-01), Elser
patent: 4291567 (1981-09-01), Murayama
patent: 4382737 (1983-05-01), Jensen et al.
patent: 4448322 (1984-05-01), Kraska

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