Composite cutting insert

Details Composite cutting insert Composite cutting insert

1992-02-28

1993-03-23

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Drill

76DIG11, 76DIG12, 408144, 408145, 175428, B23B 5102, B23C 516

Patent

active

051954036

ABSTRACT:
A method of producing a composite cutting insert for a twist drill includes the steps of cutting an intermediate blank from a composite diamond compact. The intermediate blank comprises a relatively broad tungsten carbide strip with a relatively narrow polycrystalline diamond strip at one edge. First and second cutting insert halves are cut from the intermediate blank, each cutting insert half defining a cutting edge of the diamond material. The cutting insert halves are arranged back-to-back to form a composite cutting insert, with the cutting edges on opposite sides of a central plane. The cutting edges are arranged to define a chevron shaped composite cutting edge. The cutting insert halves are preferably brazed together to form a unitary cutting insert. The invention extends to a method of producing a twist drill including the steps of forming a slot-shaped seat diametrally in the end of a twist drill body, and brazing the composite cutting insert into the seat.

REFERENCES:
patent: 4160616 (1979-07-01), Winblad
patent: 4688652 (1987-08-01), Crist
patent: 4762445 (1988-08-01), Bunting et al.
patent: 4991467 (1991-02-01), Packer

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