Blanking and forming tapered wall articles

Details Blanking and forming tapered wall articles Blanking and forming tapered wall articles

1977-11-17

1979-03-06

Larson, Lowell A.

Metal deforming

With cutting

By composite tool

72336, B21D 2416

Patent

active

041423968

ABSTRACT:
A method of producing blanks and shaped articles therefrom from sheet material comprises the steps of supporting the sheet material on a blanking die having a substantially cylindrical entrance aperture, an exit aperture and an inwardly converging transition zone extending from the entrance aperture to the exit aperture. A blank is punched from the sheet using a blanking punch having a cross-sectional area less than the extent of the entrance aperture, the blank being punched out by displacing the blanking punch into the entrance aperture. The blank is formed into a shaped article by means of a second punch and die assembly wherein the exit aperture can serve as a blank holder.

REFERENCES:
patent: 2379450 (1945-07-01), Musser
patent: 2415940 (1947-02-01), Eckstein
patent: 2490926 (1949-12-01), Slater

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