FIELD: process engineering.
SUBSTANCE: invention relates to vaned drill bit for rotary drilling. Proposed drill bit comprises body with end surface and axis, at least one vane with leading and trailing edges extending in lengthwise and radial direction outward above drill bit body end surface and several primary cutters. The latter include at least one main cutter with cutting surface. One part of the latter is covered by the part of at least one vane extending at least partially from at least one vane. It is arranged to follow the cutting path at drill bit body spinning around axis to grip the ore at motion in cutting path. Part of one vane leading edge has a skew extending over its outer surface.
EFFECT: better protection of cutters, hence, longer life, prevention of cracking.
18 cl, 8 dwg
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