FIELD: machine building.
SUBSTANCE: cutting plate has lower support surface, central cutting edge, two secondary cutting edges arranged on both sides of central cutting edge and shifted relative to it, and two transition edge connecting central cutting edge with secondary cutting edge located nearby. Two secondary cutting edges are made with vertical displacement, as well as with displacement in depth relative to central cutting edge and are spaced in lateral direction from central cutting edge. Transition edges arranged in zone wherein edge does not overlap each other, have at least at section of inclined n, where 2°≤n≤20° relative to direction of height, which passes at right angle relative to principal plane of bearing surface.
EFFECT: better chip formation, higher durability and reliability.
13 cl, 5 dwg
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