Die for self drilling screws

Details Die for self drilling screws Die for self drilling screws

1997-10-17

1999-11-09

Hail, III, Joseph J.

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

Apparatus for making externally threaded fastener or...

Screw fastener making

470 86, 470183, B21H 302

Patent

active

059803908

ABSTRACT:
Improved die for use in the manufacture of self drilling screws comprising a forwardly disposed work face provided with cavity for forming the point and flute section of the screw, a recess proximate to the cavity for receiving a portion of the flash material produced during forging and a planar bumper area terminating in a top edge proximate to the cavity.

REFERENCES:
patent: 3207024 (1965-09-01), Sommer
patent: 3747143 (1973-07-01), Eager
patent: 4114507 (1978-09-01), Fischer et al.
patent: 4136597 (1979-01-01), Takemura et al.
patent: 4147088 (1979-04-01), Whittaker, Jr.
patent: 4677703 (1987-07-01), Yamasaki

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