FIELD: process engineering.
SUBSTANCE: invention relates to machine building and may be used to improve chip removal. Drill bit point extends along drill bit lengthwise axis and comprises cutting edge extending outward and having active section directed relative to drill bit central axis and located nearby center, active section located radially outward, and nonactive curved section remote from center and located between two said active sections. Active section located nearby center and nonactive section adjoin on inner cutting angle. Distance from cutting angle to central axis of drill bit equals or is smaller than drill bit core radius.
EFFECT: reliable chip removal.
22 cl, 6 dwg
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