FIELD: mining.
SUBSTANCE: drill cutter for rotary drilling of holes consists of a body and two blades equipped with hard-alloy inserts. Cemented carbide inserts in zones of high stress concentrations are reinforced with elements made of super hard materials such as boron nitride, technical diamonds in the form of trihedral pyramid, one of which flat angles is blunt-more than 90°, and two other flat angles are acute.
EFFECT: increased service life and the field of rotary drill bit utilisation.
3 dwg
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