Patent ID: 7753625
Filing Date: 2010-07-13
Classification: B23C,Y10T

Abstract:
1. A helical cutting insert with multiple cutting edges, comprising: a front face and a back face, each front face and back face having a central portion and at least two clearance faces extending downwardly with respect to the central portion; and at least two opposing side walls, each side wall including at least two helical cut faces, each helical cut face having a concave profile, wherein at least four helical cutting edges are defined at an intersection between the at least two clearance faces of the front and back faces and the at least two helical cut faces of the at least two opposing side walls, and wherein at least one helical cutting edge further comprises a progressive cutting edge providing an initial cutting edge that progresses from a lower axial rake angle as the cutting insert enters a workpiece to a higher axial rake angle as the cutting insert exits the workpiece.