Cutting insert and milling tool
AssigneeKYOCERA Corporation
InventorsMitsuhiro Nishio, Kaoru Hatta, Yoshihide Kojima
Life of this patent
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Abstract
A milling tool includes a cutting tool insert, roughly plate-shaped and having a rake face on an upper face and a flank on a side face and a main cutting edge at an intersection ridge line part at the intersection of the rake face and the flank, fitted in the periphery of a substantially cylindrical holder removably and so that an axial rake angle of the cutting edge ridge line of the main cutting edge is positive. When the cutting tool insert is rotated about the axis of rotation of the holder, the shape of the locus of rotation of the main cutting edge in a section parallel to the axis of rotation is made an approximate circular arc shape swelling outward with progress from the ends to the center.
Claims6
A cutting insert to be fitted to a milling tool holder, comprising:
- an insert body comprising:
- an upper face comprising a rake face;
- a side face comprising a flank;
- and
- a main cutting edge at an intersection ridge line between the rake face and the flank,
- wherein a locus of rotation of the main cutting edge is formed when the holder is rotated around an axis of the holder with the cutting insert fitted to the circumferential periphery of the holder,
- wherein the locus of rotation comprises a middle part and end parts on both sides of the middle part in a holder axial direction parallel to the axis of the holder, the end parts comprising a tip end part and a base end part which is positioned further away from a tip of the holder in the holder axial direction than the tip end part,
- wherein the middle part projects further outward in a holder radial direction perpendicular to the holder axial direction than the end parts, and
- wherein the middle part has a farthest portion which projects farthest outward in the holder radial direction and which is closer to the tip end part in the holder axial direction than the base end part.
Dependencies are inferred from the claim text.