Throw away insert and face milling cutter

摘要

Throw away insert (10) having four cutting edges with high edge strength without restriction to the cutting amount. One cutting edge is provided at each of two acute-angled corners of a parallelogram. The cutting edge has a major cutting edge (14) defined on one side of the parallelogram and a minor cutting edge (15) defined on the other side and forming an angle of about 90 DEG with the major cutting edge. The lower half portion of the insert has the same structure and dimensions as the upper half portion, but is turned 180 DEG and further 3 - 7 DEG clockwise with respect to the upper half portion. Thus, two on the upper half and two on the lower half, four cutting edges in all are provided.