DRILLING TOOL Russian patent published in 2021 - IPC B23B51/00 

FIELD: drilling equipment.

SUBSTANCE: drilling tool (10), containing a tool holder (12), running along the central axle (14) and containing a first insert pocket (16) with a first contact surface (24), oriented parallel to the central axle (14). The drilling tool (10) also contains a first cutter (20), fixed in the first insert pocket (16) and lying flat with one side against the first contact surface (24) with the axial part of the first cutter (20) overlapping the flat end (38) of the tool holder (12) in the axial direction, and the first cutter (20) in its axial part contains a first major cutting edge (42) inclined relative to the first virtual plane (54), oriented perpendicular in relation to the central axle (14) and located on the flat end (38) of the tool holder (12) so that the radial outer end (58) of the first major cutting edge (42) is located at a longer distance from the first virtual plane (54) than the radial inside end (60) of the first major cutting edge (42), and the first major cutting edge (42) does not cross the first virtual plane (54). The first major cutting edge (42) touches or crosses the second virtual plane (56) determined by the central axle (14) and oriented perpendicular to the first contact surface (24).

EFFECT: higher quality of a machined hole and durability of drilling tool are attained.

16 cl, 7 dwg