End mill for cutting of high-hardness materials

摘要

The present invention relates to an end mill, which comprises a bottom edge, which is composed of an arc-shaped cutting edge that is curved when seen from a direction perpendicular to the tool axis and a linear or curved medium-to-low inclination cutting edge, and a peripheral edge, wherein, when seen from a direction parallel to the tool axis, the arc-shaped cutting edge and a rim at the rearward side of the rotation at a flank of the arc-shaped cutting edge are curved with radii of curvatures, and the radius of curvature of the arc-shaped cutting edge is smaller than the radius of curvature of the rim at the rearward side of the rotation at the flank of the arc-shaped cutting edge.

主权项

1. An end mill comprising:
a bottom edge, which is composed of an arc-shaped cutting edge that is curved when seen from a direction perpendicular to the tool axis and a linear or curved medium-to-low inclination cutting edge that is consecutive to the arc-shaped cutting edge; and a plurality of peripheral edges each comprising:
a main peripheral edge that is provided at a position that is relatively on the outer peripheral side; anda sub-peripheral edge that is provided at a position that is relatively on the inner circumference side;wherein:
when seen from a direction parallel to the tool axis, the arc-shaped cutting edge and a rim at the rearward side of the rotation at a flank of the arc-shaped cutting edge are curved with radii of curvatures, andthe radius of curvature of the arc-shaped cutting edge is smaller than the radius of curvature of the rim at the rearward side of the rotation at the flank of the arc-shaped cutting edge, andthe medium-to-low inclination cutting edge is provided from the boundary of the arc-shaped cutting edge and the medium-to-low inclination cutting edge to the tool axis.