Method for forming a countersink in a plate

Details Method for forming a countersink in a plate Method for forming a countersink in a plate

1986-08-08

1987-12-22

Crane, Daniel C.

Metal deforming

By tool-couple embodying nonplanar tool-face

72359, 72470, 72379, B21D 5300

Patent

active

047139609

ABSTRACT:
A method of forming a countersink around a hole in a metal plate. A stepped punch is pressed, stem first into the hole, with such a force and at such a rate as to cause deformation but not shearing of the metal, there being an annular ring of unrestrained surface around the hole at the backside of the plate. The resulting countersink has cold-worked surfaces, and a raised ring is formed on the backside of the plate.

REFERENCES:
patent: 2306658 (1942-12-01), Willard
patent: 3201967 (1965-08-01), Balamuth et al.
patent: 3223245 (1965-12-01), Weitzman
patent: 3967669 (1976-07-01), Egner
patent: 4072039 (1978-02-01), Nakanishi
patent: 4268099 (1981-05-01), Clausen
patent: 4430878 (1984-02-01), Dispennett et al.
patent: 4501512 (1985-02-01), Hiltz

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