Curl forming method for a can end

Details Curl forming method for a can end Curl forming method for a can end

1993-01-14

1994-02-22

Lavinder, Jack

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

413 56, B21D 2222

Patent

active

052877183

ABSTRACT:
A curl forming method for a can end which enables satisfactory curl formation in a thin can end without occurrence of wrinkles and without occurrence of scratches on internal surfaces of the can end and which can make a can end thinner. A punched can end is pressed and bended from an open end of annular flange and an opposite side by a primary forming die having an inner diameter larger than a final curl diameter by 0 to 2.0 mm to effect a primary forming, and then it is pressed and bended from the side of the flange open end by a secondary forming punch having a forming surface 14 having a final shape of a curl.

REFERENCES:
patent: 1730575 (1929-10-01), Hothersall
patent: 4561280 (1985-12-01), Bachmann et al.
patent: 4567746 (1986-02-01), Bachmann
patent: 4903521 (1990-02-01), Bulso, Jr. et al.

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