Insert type drill and insert therefor

Details Insert type drill and insert therefor Insert type drill and insert therefor

1977-12-07

1978-12-26

Vlachos, Leonidas

Cutters, for shaping

Including tool having plural alternatively usable cutting edges

With integral chip breaker, guide or deflector

B26D 1100

Patent

active

041313836

ABSTRACT:
A single flute drill having a single, replaceable cutting insert which can drill from the solid, as well as being used for other single point machining operatings such as turning, internal and external diameter boring, contouring and facing. The insert is configured and related to the drill body so as to provide a single, radially extending cutting edge which has an effective neutral rake and negative lead. A specific insert structure is also provided for use in the drill. The disclosed insert comprises a solid body having parallel upper and lower faces each generally in the shape of an equilateral parallelogram and joined along their peripheral edges by side walls. One cutting edge is formed along the juncture of one side wall and the upper face and is inclined along its length toward the lower face. A second cutting edge is formed along the juncture of the lower face and a second side wall which intersects the first side wall at a corner. The second cutting edge is inclined along its length from the corner of the intersection toward the upper face.

REFERENCES:
patent: 3504413 (1970-04-01), Siewert et al.
patent: 3848303 (1974-11-01), Faber

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