INSERT WITH REPLACEABLE CUTTING EDGE AND CORNER MILLING CUTTER WITH REPLACEABLE CUTTING EDGE

摘要

A replaceable-blade cutting insert 20 for corner milling cutters includes: a first surface 1 and a second surface 2; a third surface 3 and a fourth surface 4 connected to a first side edge and a second side edge thereof respectively; and a fifth surface 5 and a sixth surface 6 connected to a first edge and a second edge of the first surface and the second surface respectively. The first surface 1 is used as rake face, the third surface is used as an outer perimeter flank face, and the fifth surface is used as a forward flank face. A twisted surface 10 is disposed on a section of the third surface 3 to form a ridge line 7 that acts as a main cutting edge intersecting with the first surface 1 and interposed between the third surface 3 and the first surface. It would be preferable for the first surface 1 and the second surface 2 to be positioned with a height offset relative to each other so that at least one set of diagonal corners are projected.