DOUBLE-SIDED, INDEXABLE TURNING INSERT Russian patent published in 2018 - IPC B23B27/16 B23B27/22 

FIELD: turning; drilling.

SUBSTANCE: cutting insert has a polygonal base shape comprising a plurality of corners, a peripheral back surface and identical upper and lower sides with support surfaces located in reference planes that are parallel to each other and a neutral plane located midway between them, and with respect to which said back surface is at right angles. Along said upper side, and also said lower side, there are primary cutting edges (12), each of which includes nose edge (14) located in the corner, and two main edges (15) that converge thereto, are located in the front plane at an angle with respect to the neutral plane, and are converted into auxiliary cutting edges (19) that run parallel to the neutral plane and divide each pair of primary cutting edges along the same side of said turning insert. Guiding surfaces (24, 25, 21) that lead off the shavings are disposed within chip surfaces (16a, 16b, 16c) of the cutting edge. Primary cutting edge (12) has a predominantly positive cutting geometry such that the sharpening angle of the cutting edge between chip surface (16a) and the back surface is sharp in arbitrary sections along leading edge (14), as well as along main edges (15).

EFFECT: improved chip control.

12 cl, 25 dwg