FIELD: mining.
SUBSTANCE: drilling bit for drilling of wells in mine rocks includes housing with crown ring separated with waterways into sectors, waterways and self-sharpening cutters. Sectors have the outlet contacting the bottom-hole during the drilling process, sealing it; at that, self-sharpening two-, three-layered cutter which is made from heat-resistant hard or super hard tool material and which has the outlet providing the insert into the bottom-hole during drilling process is attached from the front to each sector.
EFFECT: improving cutting efficiency of mine rocks by localisation of cutting heat in the zone of bottom-hole for thermal softening of near-surface layer of drilled rocks.
4 cl, 4 dwg
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