Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1985-12-02
1986-09-16
Gilden, Leon
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
413 8, 413 56, 72354, B21D 4500
Patent
active
046114815
ABSTRACT:
A die for forming flanged can ends is provided according to the invention. The die includes an upper punch section including a hard ring having inner and outer rounded lower corners and a punch cut edge having an upwardly extending curvilinear female profile in the lower inner portion thereof which forms an annular gap between the punch cut edge and the hard ring.
A die section is disposed beneath the punch section comprising an inner die, a first upwardly biased draw ring mounted outwardly of the die and in inner contacting relationship with the punch cut edge. A second draw ring is mounted adjacent the inner die and in contacting relationship with the hard ring and a fixed wipe-up ring is located between the first and second draw rings. The upper portion of the wipe-up ring has a male profile matable with the female profile of the punch cut edge in the annular gap and has a downwardly curved inner portion which is matably engagable with the outer corner of said hard ring.
The burr formed in the outer corner of the blank after cutting in the die is disposed inwardly at the end of the stamping operation. Moreover, the die promotes the formation of uniform flange lengths.
REFERENCES:
patent: 3768295 (1973-10-01), Cudzik
patent: 4031837 (1977-06-01), Jordan
patent: 4109599 (1978-08-01), Schultz
patent: 4372720 (1983-02-01), Herdzina
patent: 4559801 (1985-12-01), Smith
Gilden Leon
Goebel Ronald G.
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