Progressive die for drawless fin

Details Progressive die for drawless fin Progressive die for drawless fin

1990-08-13

1991-04-16

Crane, Daniel C.

Metal deforming

With cutting

By shearing tool-couple

72327, B21D 2814, B21D 2834

Patent

active

050072757

ABSTRACT:
A progressive die for producing collared holes in a sheet. The die includes a first station having a pattern of three punches producing three spaced apart holes in the sheet. A main punch at the second die station is extended into the three holes producing a single hole with portions of the sheet extending therein. The straightening punch mounted at the third station of the die has a diameter larger than the single main hole and is extended therethrough bending the portions extending into the hole outwardly forming a collar. The curling punch mounted at the fourth station of the die, curls the distal end of the collar outwardly.

REFERENCES:
patent: 3701275 (1972-10-01), Overway
patent: 3995469 (1976-12-01), Ames
patent: 4150556 (1979-04-01), Melnyk
patent: 4550588 (1985-11-01), Abe
King, J. A., "Progressive Die Produces Safety Runway", from American Machinist, Nov. 6, 1947, pp. 128-131.

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