Process and a device for cold working metal sheet, with a double

Details Process and a device for cold working metal sheet, with a double Process and a device for cold working metal sheet, with a double

1977-09-08

1978-10-24

Gilden, Leon

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72466, B21D 2200, B21B 2500

Patent

active

041214480

ABSTRACT:
A device for cold working a metal sheet, with double action in a single operative stage, suitable particularly for forming drawn articles in a single body with a shaped and folded bottom, comprising reciprocating drawing means including a forming punch rigid with a first part of a reciprocating press; a male member arranged for carrying out a conventional drawing operation in cooperation with a sheet-presser; said male member receiving in its inside an auxiliary punch mounted partially slidable within said male member, said auxiliary punch being arranged for cooperating with an elastic element; the arrangement being such that at the point of maximum engagement between said forming punch and said male member said auxiliary punch carries out a first shaping operation of the bottom of said drawn body with the contemporaneous storage of deformation power in said elastic element and said auxiliary punch carries out the deformation or folding of said bottom at the moment of the mutual moving away of said male member from said forming punch due to the release of the deformation power of said elastic element on said auxiliary punch.

REFERENCES:
patent: 2754785 (1956-07-01), Zatzo
patent: 2763228 (1956-09-01), Lawson
patent: 3113377 (1963-12-01), Oakes

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