Method of forming scored metal sheet

Details Method of forming scored metal sheet Method of forming scored metal sheet

1982-09-14

1985-03-12

Rutledge, L. Dewayne

Sheet metal container making

Method

Forming or treating metallic closure

413 67, B21D 1702, B21D 5138

Patent

active

045041814

ABSTRACT:
This relates to the formation of a line of weakening in the form of a score in a metal sheet for defining a line along which the metal sheet may be ruptured. It has been found that when the metal sheet in the area which is to be scored is compressed, the metal sheet may be more easily scored to a controlled residual with a minimum of undue fracture. Accordingly, beads are coined on the underside of the metal sheet on opposite sides of the intended position of the score in a first operation to compress the metal. The then compressed metal is engaged by a conventional scoring die on the opposite surface thereof and scoring of the metal is effected in the normal manner.

REFERENCES:
patent: 3359773 (1967-12-01), Stochbery
patent: 3406866 (1968-10-01), Jasper
patent: 3650006 (1972-03-01), Kinkel
patent: 3688718 (1972-09-01), Schrecker
patent: 3728980 (1973-04-01), Fraze
patent: 3946683 (1976-03-01), Jordan
patent: 3954075 (1976-05-01), Jordan
patent: 4012935 (1977-03-01), Holk et al.
patent: 4122791 (1978-10-01), Brown
patent: 4348464 (1982-09-01), Khoury

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