Method of manufacturing a washer

Details Method of manufacturing a washer Method of manufacturing a washer

1991-10-07

1993-11-09

Larson, Lowell A.

Threaded, headed fastener, or washer making: process and apparat

Process

Making washer

72327, B21D 5320

Patent

active

052598195

ABSTRACT:
A method of manufacturing a washer includes the steps of: (a) feeding a metal wire into a die having a bearing face and a through hole which opens to the bearing face so as to permit the metal wire in the through hole to protrude out of the bearing face at a predetermined length; (b) punching the protruded metal wire against the bearing face to form a disc with a punching head which includes a core and a shell; (c) punching the disc to form a central hole on the disc by forcing the core out of said shell and into the through hole; and (d) retracting the punching head to allow the disc to separate from the metal wire.

REFERENCES:
patent: 641255 (1900-01-01), Atkins
patent: 677883 (1901-07-01), Neider
patent: 1983618 (1934-12-01), Lamond
patent: 2829388 (1958-04-01), Dzama
patent: 3036318 (1962-05-01), Chatfield
patent: 4435973 (1984-03-01), Nakazawa et al.

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