Patent ID: 7600952
Filing Date: 2009-10-13
Classification: B23C,Y10T

Abstract:
1. A cutting insert, comprising: a top surface comprising four identical convex cutting edges and four identical nose corners connecting the convex cutting edges, wherein each convex cutting edge includes a curved cutting edge region, a primary substantially straight cutting edge region adjacent the curved cutting edge region, and a secondary substantially straight cutting edge region connecting the first substantially straight cutting edge region and a nose corner, and wherein a radius of each convex cutting edge is greater than or equal to two times a radius of the largest circle that may be inscribed on the top surface; a bottom surface comprising a bottom edge; four identical side surfaces, each side surface extending downward from a convex cutting edge to the bottom edge, each side surface comprising a secondary conical clearance surface extending downward from each nose corner to the bottom edge; wherein when the cutting insert is mounted in an insert pocket of a milling cutter a primary substantially straight cutting edge region extends in a direction substantially perpendicular to a cutting axis of the milling cutter.