Method of burring

Details Method of burring Method of burring

1993-02-01

1994-03-22

Larson, Lowell A.

Metal deforming

With cutting

By shearing tool-couple

72358, B21D 2200

Patent

active

052953904

ABSTRACT:
A method of burring includes a first step of forming, in a metal plate, a bottomed expanded portion expanded into a die hole with a punch and a die having the die hole into which the punch is inserted, the die hole being formed such that a predetermined gap is formed between an inner peripheral face of the die hole and an outer peripheral face of the punch so as to have a width larger than a thickness of the metal plate, a second step of swaging the bottom of the expanded portion of the metal plate between the punch and the bottom face of the die hole to render the bottom of the expanded portion thinner such that a material of the expanded portion bottom is caused to flow to a peripheral wall portion of the expanded portion positioned in the gap between the inner peripheral face of the die hole and the outer peripheral face of the punch, thereby thickening the peripheral wall portion of the expanded portion, and a third step of opening the bottom of the expanded portion.

REFERENCES:
patent: 1048046 (1912-12-01), Currey
patent: 1695476 (1928-12-01), Winkler
patent: 1699361 (1929-01-01), Karmazin
patent: 2070784 (1937-02-01), Cox
patent: 2909281 (1959-10-01), Koskinen
patent: 3365926 (1968-01-01), Price
patent: 3399560 (1968-09-01), Connolly et al.
patent: 3719068 (1973-03-01), Hashimoto et al.
patent: 3771480 (1973-11-01), Johnson
patent: 4400965 (1983-08-01), Schey
patent: 5159826 (1992-11-01), Miyazawa et al.

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