Metal stamping

Details Metal stamping Metal stamping

1991-07-22

1993-11-30

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

29609, 310 42, 310216, H02K 1502

Patent

active

052653200

ABSTRACT:
A method of progressive die stamping for cutting apertures in a sheet metal strip without producing stress induced distortion of the apertures after cut-off of the strip. The sheet metal strip is peened to form one dent between the aperture and one edge of the strip and to form another dent between the aperture and the other edge of the strip and subsequently cutting the strip with a cut-off punch. The peening operation may be done before, during or after the aperture punching operation.

REFERENCES:
patent: 2085092 (1937-06-01), Furth
patent: 2304607 (1942-12-01), Sleeter
patent: 3202851 (1965-08-01), Zimmerle et al.
patent: 3834013 (1974-09-01), Gerstle

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