CUTTING INSERT, CUTTING TOOL, AND CUTTING METHOD USING THE CUTTING TOOL

摘要

A cutting insert provided with an upper surface, side surfaces, and cutting edges provided at portions at which the upper surface and the side surfaces intersect with each other.  Each side surface has grooves reaching the upper surface so as to divide the cutting edge into small cutting edges.  Projections are provided on the upper surface at positions to which the grooves extend.