Patent ID: 7806634
Filing Date: 2010-10-05
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 and a first substantially straight cutting edge region adjacent the curved cutting edge region, and wherein a radius of each curved cutting edge region 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 between a convex cutting edge and the bottom edge, each side surface comprising a secondary conical clearance surface extending from each nose corner toward the bottom edge; wherein when the cutting insert is mounted in an insert pocket of a milling cutter a first substantially straight cutting edge region extends in a direction substantially perpendicular to a cutting axis of the milling cutter.