US 12,454,011 B2
Insert, cutting tool, and method for cutting workpiece using the cutting tool
Yoshihito Ikeda, Ritto (JP)
Assigned to KYOCERA CORPORATION, Kyoto (JP)
Appl. No. 17/757,145
Filed by KYOCERA CORPORATION, Kyoto (JP)
PCT Filed Dec. 11, 2020, PCT No. PCT/JP2020/046298
§ 371(c)(1), (2) Date Jun. 10, 2022,
PCT Pub. No. WO2021/117872, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2019-223521 (JP), filed on Dec. 11, 2019.
Prior Publication US 2023/0056761 A1, Feb. 23, 2023
Int. Cl. B23B 27/14 (2006.01)
CPC B23B 27/143 (2013.01) [B23B 2200/321 (2013.01); B23B 2200/328 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A cutting insert, comprising:
an upper surface;
a lower surface positioned at a side opposite to the upper surface;
a lateral surface connected to the upper surface and the lower surface; and
a cutting edge positioned at an intersection of the lateral surface and the upper surface;
wherein the upper surface comprises
a corner portion defined by a boundary between the upper surface and the lateral surface, the corner portion having a shape of a curved line that is outwardly convex in a plan view of the upper surface,
a side portion directly connected to the corner portion and forming the cutting edge together with the corner portion,
a rake face that extends along the side portion and the corner portion and extends downward with increasing distance from the side portion and the corner portion,
a first rising face that is separated from the cutting edge with the rake face disposed therebetween and extends upward with increasing distance from the rake face, and
a second rising face that is connected to an upper portion of the first rising face and extends upward with increasing distance from the first rising face,
wherein the first rising face comprises
a first sub-face that extends along the corner portion, and
a second sub-face that extends along the side portion,
wherein the second rising face comprises
a third sub-face that extends along the corner portion, and
a fourth sub-face that extends along the side portion,
wherein an inclination angle of the first sub-face is greater than an inclination angle of the third sub-face in a first sectional view taken along a bisector of the corner portion,
wherein an inclination angle of the second sub-face is greater than an inclination angle of the fourth sub-face in a second sectional view taken in a direction orthogonal to the side portion,
wherein an entirety of a first boundary, which is a boundary between the first sub-face and the third sub-face, is positioned above the cutting edge along the corner portion,
wherein a second boundary, which is a boundary between the second sub-face and the fourth sub-face, includes
a first portion positioned above the cutting edge along the side portion, and
a second portion positioned below the cutting edge along the side portion, and
wherein a height of the second boundary decreases from the first portion to the second portion in a direction along the side portion and away from the corner portion.