Method and tool for generating countersunk holes in composite ma

Details Method and tool for generating countersunk holes in composite ma Method and tool for generating countersunk holes in composite ma

1981-11-18

1984-05-22

Briggs, William R.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

408224, 408225, B23B 3500, B23B 5100

Patent

active

044498659

ABSTRACT:
A method and tool for drilling countersunk holes in a composite of materials having different strength and elastic characteristics. The tool includes a front hole cutting section for initially generating the hole, and a rear countersink cutting section providing an enlarged tapered entrance to the hole. The tool has a single flute which extends axially along the length of the front and rear tool cutting sections. The front cutting section includes a planar end surface which is inclined relative to the tool axis and which defines with the flute and a cylindrical outer surface of this section, a single end cutting point and adjacent radial and longitudinal cutting edges. The rear cutting section includes an outer surface which extends radially outward and axially rearward from the front cutting section, and which intersects a leading side of the flute at an acute angle to define a countersink cutting edge. The method provides for simultaneous point and surface cutting of the composite to form an initial hole, and subsequent cutting of the composite to form the enlarged tapered entrance to the hole. Point and surface cutting occur at the outer circumferential surface of the hole.

REFERENCES:
patent: 1643679 (1927-09-01), Roderick
patent: 1711012 (1929-04-01), Brandt
patent: 2403861 (1946-07-01), Klemm
patent: 2415329 (1947-02-01), Arndt
patent: 2529143 (1950-11-01), Eriksson
patent: 4093395 (1978-06-01), Luebbert
patent: 4338050 (1982-07-01), Ozer et al.
Dupont Memo, Countersink for Composites of "Kovlar" Aramid, Sep. 1975.

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