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US 9,764,389 B2Granted
Cutting tool
AssigneeKYOCERA Corporation
InventorYouji Kobayashi
Life of this patent
Estimating the term…
Abstract
A cutting tool including an insert and a holder to which the insert is secured. The insert has a rod with a substantially circular transverse cross-section. The insert includes a shank portion and a cutting edge portion. The cutting edge portion is located at an end portion continuous with the shank portion. In the cutting edge portion, one end of a cutting edge ridge protrudes toward the periphery of the rod. When the insert is secured to the holder, the cutting edge ridge has a negative radial rake angle.
Claims9
A cutting tool comprising:
- an insert having a rod shape with a substantially circular transverse cross-section, the insert comprising:
- a shank portion;
- a cutting edge portion being continuous with the shank portion and comprising a cutting edge ridge that is located at a front end portion of the cutting edge portion, wherein one end of the cutting edge ridge extends toward a periphery of the insert;
- an inclined surface at a rear end surface of the cutting insert;
- a first taper located above the cutting edge ridge in the shank portion, as viewed from an end portion of the insert;
- a second taper located below the cutting edge ridge as viewed from the end portion of the insert;
- a third taper located below the cutting edge ridge as viewed from the end portion of the insert;
- and
- a holder to which the insert is secured, the holder comprising:
- an insertion hole in the holder, wherein the shank portion of the insert is inserted in the insertion hole;
- and
- a positioning member which is located perpendicular to the longitudinal direction of the insertion hole;
- wherein the cutting edge ridge has a negative radial rake angle,
- wherein the inclined surface and the positioning member has a line contact, and
- wherein an offset between a direction of the line contact, as viewed from a front end of the insert, and the cutting edge ridge defines the radial rake angle,
- wherein the second taper is the sole taper that is below the cutting edge ridge in the cutting edge portion, as viewed from the front end portion of the insert,
- wherein the third taper is the sole taper that is below the cutting edge ridge in a front end region of the shank portion, as viewed from the front end portion of the insert, and
- wherein an inclination angle θ2 of the second taper is larger than an inclination angle θ3 of the third taper.
15 more elements
A cutting tool comprising:
- an insert having a rod shape with a substantially circular transverse cross-section, the insert comprising:
- a shank portion;
- a cutting edge portion being continuous with the shank portion and comprising a cutting edge that is located at a front end portion of the cutting edge portion, wherein one end of the cutting edge extends toward a periphery of the insert;
- a first taper located above a ridge of the cutting edge in the shank portion, as viewed from an end portion of the insert;
- a second taper located below the cutting edge ridge as viewed from the end portion of the insert;
- a third taper located below the cutting edge ridge as viewed from the end portion of the insert;
- and
- a holder to which the insert is secured;
- wherein
- the cutting edge has a negative radial rake angle,
- wherein the second taper is the sole taper that is below the cutting edge ridge in the cutting edge portion as viewed from the front end portion of the insert,
- wherein the third taper is the sole taper that is below the cutting edge ridge in a front end region of the shank portion, as viewed from the front end portion of the insert, and
- wherein an inclination angle θ2 of the second taper is larger than an inclination angle θ3 of the third taper.
10 more elements
Dependencies are inferred from the claim text.