CUTTER PLATE WITH EIGHT CUTTING EDGES AND PLATE HOLDER Russian patent published in 2011 - IPC B23B27/16 

FIELD: process engineering.

SUBSTANCE: rotary plate comprises two opposite, in fact, square location surfaces turned relative to each other about central axis located perpendicular to said surfaces, and four identical face surfaces. Main cutting edge is arranged in said holder between each location surface and face surface to run along only a section of face surface. Note here that every face surface has two angular edges opposed along diagonal line to make circular arc and auxiliary cutting edge adjoining appropriate principal cutting edge, and two recessed flutes that pass from appropriate angular edge along appropriate principal cutting edge to its rear end.

EFFECT: reliable attachment of cutter plate.

17 cl, 7 dwg