Pierce nut and a back-up die used in combination therewith

Details Pierce nut and a back-up die used in combination therewith Pierce nut and a back-up die used in combination therewith

1983-05-09

1985-07-02

Jones, Jr., James L.

Metal working

Means to assemble or disassemble

Overedge assembling means

294321, 29512, B23P 1100

Patent

active

045259127

ABSTRACT:
A pierce nut has a plurality of projections which are integrally formed with a cylindrical body of the pierce nut. When the pierce nut is pressed against a metal sheet laid on a back-up die, an opening is formed in the metal sheet only by shearing force between the pierce nut and the back-up die, with no other force being used to press-break the metal sheet, and the projections are deformed by an annular bank portion of the back-up die at different portions thereof each time the back-up die is used. Thus, the use of the present pierce nut in combination with the present back-up die remarkably extends the life of the back-up die.

REFERENCES:
patent: 3920059 (1975-11-01), Grube
patent: 3938239 (1976-02-01), Lauth

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