Punch and die for forming a protrusion and a pair of slits in sh

Details Punch and die for forming a protrusion and a pair of slits in sh Punch and die for forming a protrusion and a pair of slits in sh

1993-11-10

1995-01-03

Crane, Daniel C.

Metal deforming

With cutting

By composite tool

B21D 2810

Patent

active

053775198

ABSTRACT:
A method for cutting and separating from a piece of sheet metal a product, comprising a first step for contouring the product while leaving a small joint such as a connecting web or micro-joint which connects the product to the sheet metal, a second step for forming a protrusion on or adjacent to the small joint by lancing, embossing, or semi-shearing, and a third step for pressing the protrusion in order to shear the small joint.

REFERENCES:
patent: 2508758 (1950-05-01), Hollcrith
patent: 3094158 (1963-06-01), Reid
patent: 3169684 (1965-02-01), Purski
patent: 3314272 (1967-04-01), Dahl
patent: 3357078 (1967-12-01), Moltchan
patent: 3717022 (1973-02-01), DuBois
patent: 4109500 (1978-08-01), Franek
patent: 4165629 (1979-08-01), McCabe
patent: 4282996 (1981-08-01), Maeda
patent: 4477537 (1984-10-01), Blase
patent: 4546683 (1985-10-01), Volkel
patent: 4561579 (1985-12-01), Fleming

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