REPLACEABLE CUTTING INSERT Russian patent published in 2009 - IPC B23B27/00 

FIELD: instrument engineering.

SUBSTANCE: replaceable cutting insert is provided with a chip lead irregular face arranged along a major cutting edge and adjoining thereto. Its cross sections reform along the major cutting edge from a convex curve to concave curvature of the adjoining circles provided below and above the front face of the insert respectively. Cross-section radiuses of the chip lead faces vary inversely in orthogonal planes.

EFFECT: for technological enhancement and higher reliability of chip breaking in plastic material processing, considering the chip lead face being reformed convex to concave as far as distanced from the insertion vertex.

6 cl, 8 dwg, 1 tbl