Patent ID: 6702047
Filing Date: 2004-03-09
Classification: B23B

Abstract:
A drill bit, comprising:an elongated shank defining a rotary axis D of the drill bit and having at least one cutting insert at an end thereof; said cutting insert having at least one front-end cutting edge extending from a periphery to said rotary axis D of the drill bit, said cutting edge being formed by a rake face, lying ahead of said cutting edge in a direction of rotation of said drill bit, and a flank, lying behind said cutting edge in the direction of rotation of the drill bit, the rake face and the flank face adjoining one another and enclosing a wedge angle &ggr; with one another; said rake face having formed therein at least one recess between a marginal segment at the periphery of the drill bit and a center segment at a center of the drill bit, said recess running into the adjacent said flank and reducing the wedge angle &ggr; defining said cutting edge, at least in a longitudinal section extending directly up to the cutting edge, relative to the wedge angle &ggr; at the remaining said cutting-edge segments.