Forming bores in bendable layered materials

Details Forming bores in bendable layered materials Forming bores in bendable layered materials

1989-12-11

1991-04-02

Gorski, Joseph M.

Metal working

Method of mechanical manufacture

Shaping mating parts for reassembly in different positions

295251, 264339, B23P 1700

Patent

active

050036831

ABSTRACT:
A method of forming a circular opening in a layered sheet material to be subsequently bent which causes the layers to shift relative to one another in a direction normal to the bend including the steps of piercing the layers material with an oblong opening the spaced apart circular end configurations, then bending the layered material so that the opposite end portions in different layers are moved toward one another sufficiently so that a final circular opening is formed.

REFERENCES:
patent: 2751664 (1956-06-01), Arnit
patent: 3006443 (1961-10-01), Siler
patent: 3158045 (1964-11-01), Siler
patent: 3238900 (1966-03-01), Kendall
patent: 3580040 (1971-05-01), Lang
patent: 4577888 (1986-05-01), Takada

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