Counter sink drill

Details Counter sink drill Counter sink drill

1994-07-26

1996-01-30

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool having crystalline cutting edge

408225, B23B 5110

Patent

active

054876273

ABSTRACT:
A cutter body for counter sink drilling fiber reinforced plastic materials, such cutter body having a pilot portion at a distal end of the cutter body and a countersinking section formed adjacent to the pilot portion in a region on the base end side of the cutter body. The countersinking section comprises three unit machining sections disposed with equal angular intervals in the circumferential direction of the cutter body. Each unit machining section comprises an abrasive layer formed by electrodepositing diamond abrasive grains on a conical surface in turn provided on the cutter body with a chip discharge groove and a finishing edge overhanging from the abrasive layer by an amount t and disposed in order successively rearward in the direction of rotation of a drill or cutter. The finishing edge is formed on a hard sinter, which contains diamond grains as a main ingredient, on a laminar sinter.

REFERENCES:
patent: 2978846 (1961-04-01), Barron
patent: 4720218 (1988-01-01), DeFries et al.
patent: 5052153 (1991-10-01), Wiand
patent: 5123217 (1992-06-01), Ishikawa et al.
patent: 5354155 (1994-10-01), Adams

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