Method for forming a collared hole in sheet material

Details Method for forming a collared hole in sheet material Method for forming a collared hole in sheet material

1990-01-09

1991-04-23

Crane, Daniel C.

Metal deforming

With cutting

By shearing tool-couple

72327, 29890043, B21D 2826

Patent

active

050090950

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: 2135418 (1938-11-01), Tinnerman
patent: 2246022 (1941-06-01), Tinnerman
patent: 3108371 (1963-10-01), Munse
patent: 4234041 (1980-11-01), Melnyk

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