Cutting edge exchange type cutting insert, the cutting insert holder, cutting tool, turning device and turning method

摘要

indexable type cutting insert includes a clearance surface and a substantially parallelogram shape and a plurality of side surfaces. Flank is surrounded by a plurality of edges. Each edge, joining the flank on one side of the side surfaces. A plurality of edge portions includes a first slice blade and a second piece blade. The first slice blade has a shape corresponding to a portion of the first bending curve, the second piece blade has a shape corresponding to a portion of the second bending curve. Second bending curve is obtained by translating along a first bending curve in the width direction of the cutting insert. The cutting insert has two-fold rotational symmetry with respect to symmetry axis is perpendicular to the width direction. Longitudinal cutting insert is perpendicular to the width direction and the symmetry axis.