Patent ID: 11865629
Assignee: KENNAMETAL INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 7:
8. A rotary cutting tool, comprising:
a shank portion; and
a cutting portion adjoining the shank portion and having a cutting end, the cutting portion having a plurality of blades separated by flutes, each blade including a leading face, a trailing face, and a land surface extending between the leading face and the trailing face, each blade including an end cutting edge extending from an outer diameter of the cutting portion towards the central, longitudinal axis, and a peripheral cutting edge at an intersection between the leading face and the land surface, the end cutting edge including a first end face cutting edge portion proximate an outer diameter of the rotary cutting tool, and a second end face cutting edge portion adjoining the first end face cutting edge portion,
wherein the first end face cutting edge portion defines a first axial rake angle between about −1 degrees and about −15 degrees with respect to a plane, PZ-PZ, that is substantially parallel to a central, longitudinal axis, A-A, of the rotary cutting tool, a first dish angle that varies in a radial direction between about 0.5 degrees and about 8 degrees with respect to a plane, PX-PX, that is substantially perpendicular to the central, longitudinal axis, A-A, of the rotary cutting tool, and a first radial angle of between about −2 degrees and about +2 degrees with respect to a plane, PY-PY, that is substantially perpendicular to the central, longitudinal axis, A-A, of the rotary cutting tool, and
wherein the second end face cutting edge portion defines a second axial rake angle between about −1 degrees and about −15 degrees with respect to the plane, PZ-PZ, that is substantially parallel to a central, longitudinal axis, A-A, of the rotary cutting tool, a second dish angle that varies in the radial direction between about 4 degrees and about 80 degrees with respect to the plane, PX-PX, that is substantially perpendicular to the central, longitudinal axis, A-A, of the rotary cutting tool, and a second radial angle between about 11 degrees and about 15 degrees with respect to the plane, PY-PY, that is substantially perpendicular to the central, longitudinal axis, A-A, of the rotary cutting tool, thereby enabling the rotary cutting tool to perform a ramp operation with a ramp angle of between about 15 degrees and about 45 degrees.