Patent ID: 6722824
Filing Date: 2004-04-20
Classification: B23C,Y10T

Abstract:
An indexable cutting insert for use in milling cutters comprising:a top surface, a bottom surface and M substantially identical side surfaces extending between the bottom surface and the top surface, the top surface having the general shape of an M-sided polygon in a top view of the cutting insert; each side surface being located between two corner side surfaces; each side surface sloping outwardly from the bottom surface toward the top surface and intersecting with the top surface at an insert cutting edge, the insert cutting edge being located between two corner edges and being substantially parallel to the bottom surface; each insert cutting edge comprising a primary cutting edge extending between two auxiliary cutting edges, each auxiliary cutting edge being adjacent a corner edge; each side surface comprising at least two component surfaces: a first relief surface adjacent the primary cutting edge, and a second relief surface merging with the first relief surface at a boundary line and intersecting with the top surface at the two auxiliary cutting edges; wherein M is an integral multiple of four and the first relief surface has a width dimension measured perpendicularly to the insert cutting edge, the width dimension having a minimum value proximal to the two auxiliary cutting edges and a maximum value at a central region of the insert cutting edge.