Single station, in-die curling of can end closures

Details Single station, in-die curling of can end closures Single station, in-die curling of can end closures

1985-02-04

1986-03-11

Gilden, Leon

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72347, 413 9, 413 62, B21D 2200

Patent

active

045746087

ABSTRACT:
Method and apparatus for forming end closures for containers complete with a peripheral curl for attachment to the top of a container without press modification includes a unique split die core ring. The method includes performing the operations of blanking the end panel against the cut edge, forming the chuckwall against the die core ring with a punch and punch shell and finally setting the chuckwall by wiping over the radius of the die core ring against a fluidly supported piston and simultaneously applying a curl to the peripheral edge of the panel prior to completion and removal from the press station. The method is performed by utilization of a split die core ring having inner and outer concentric segments, the outer segment of which is withdrawn as the punch shell advances to initiate a curl between the inner face of the punch shell and the outer face of the fixed inner segment of the die core ring. The apparatus for carrying out the method includes a conventional double acting press with a punch core on the inner slide, a punch shell on the outer slide and a die core on the fixed base. A split die core ring is employed on the fixed base and comprises a fixed inner ring and movable outer ring. The inner and outer rings are designed so as to effectively operate as a single ring during the initial forming operation. During the curl forming operation, however, the punch shell moves the outer portion of the split die core ring out of the way and forms the curl in the peripheral edge surface of the closure in the space vacated thereby.

REFERENCES:
patent: 3902347 (1975-09-01), Ridgway et al.
patent: 4031836 (1977-06-01), Grise et al.
patent: 4052949 (1977-10-01), Woodley
patent: 4093102 (1978-06-01), Kraska
patent: 4106422 (1978-08-01), Buhrke
patent: 4116361 (1978-09-01), Stargell
patent: 4213324 (1980-07-01), Kelley et al.
patent: 4244315 (1981-01-01), Klein
patent: 4372720 (1983-02-01), Herdzina et al.
patent: 4420283 (1983-12-01), Post

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