# US 2019/0168310 A1 · Cutting insert, cutting tool, and method of manufacturing machined product > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0168310 A1 - Document ID: US20190168310A1 - Status: Published application - Kind: A1 - Application number: 16/321,055 - Filed: 2017-07-26 - Published: 2019-06-06 - Earliest claimed: 2016-07-28 - Assignees: KYOCERA Corporation - Applicants: Kyocera Corporation - Inventors: Yoshihito IKEDA - Web page: https://patentgrep.com/patent/US20190168310A1 ## CPC - B23B 27/145: {characterised by having a special shape} - B23C 5/202: {Plate-like cutting inserts with special form (special form related to securing of the insert B23C5/22)} - B23B 27/14: Cutting tools of which the bits or tips {or cutting inserts} are of special material - B23B 27/22: Cutting tools with chip-breaking equipment {(B23B27/045, B23B27/143, B23B27/16 take precedence; arrangements for chip-breaking B23B25/02; for milling tools B23C5/165)} - B23C 5/06: Face-milling cutters, i.e. having only or primarily a substantially flat cutting surface - B23B 2200/0447: Parallelogram - B23B 2200/286: Positive cutting angles - B23B 2200/3654: being variable - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) - B23C: MILLING (broaching B23D; broach-milling in making gears B23F; arrangement for copying or controlling B23Q) ## Abstract A cutting insert includes an upper surface and a cutting edge. The upper surface includes a first surface and a second surface which is located further inward than the first surface. The cutting edge includes a first cutting edge and a second cutting edge. The first surface includes a first region along the first cutting edge, a second region adjacent to the first region, and a third region which is adjacent to the second region and along the second cutting edge. The second surface includes a fourth region, a fifth region and a sixth region. A width of the second region is smaller than each of a width of the first region and a width of the third region. An inclination angle of the fifth region is smaller than each of an inclination angle of the fourth region and an inclination angle of the sixth region. ## Claims ### Claim 1 A cutting insert, comprising: an upper surface comprising: a first side part; a second side part; and a corner part located between the first side part and the second side part; a lower surface located at an opposite side of the upper surface; a side surface located between the upper surface and the lower surface; and a cutting edge located at an intersection of the upper surface and the side surface, wherein the upper surface further comprises a first surface along the cutting edge, and a second surface which is located further inward than the first surface and inclined toward the lower surface as going farther from the first surface, the cutting edge comprises a first cutting edge located at the corner part and a second cutting edge located at the first side part, the first surface comprises a first region along the first cutting edge, a second region adjacent to the first region, and a third region which is adjacent to the second region and along the second cutting edge, the second surface comprises a fourth region located further inward than the first region, a fifth region located further inward than the second region, and a sixth region located further inward than the third region, a width of the second region in a direction perpendicular to the cutting edge is smaller than each of a width of the first region in the direction perpendicular to the cutting edge and a width of the third region in the direction perpendicular to the cutting edge, and an inclination angle of the fifth region is smaller than each of an inclination angle of the fourth region and an inclination angle of the sixth region. ### Claim 2 (depends on 1) The cutting insert according to claim 1, wherein the second region comprises: a first portion which is adjacent to the first region and along the first cutting edge, and a second portion which is adjacent to the third region and along the second cutting edge. ### Claim 3 (depends on 2) The cutting insert according to claim 2, wherein a width of the first portion in the direction perpendicular to the cutting edge decreases as going farther from the first region, and a width of the second portion in the direction perpendicular to the cutting edge decreases as going farther from the third region. ### Claim 4 (depends on 3) The cutting insert according to claim 3, wherein a decrement of the width of the first portion is higher than a decrement of the width of the second portion. ### Claim 5 (depends on 1) The cutting insert according to claim 1, wherein the width of the third region in the direction perpendicular to the cutting edge is greater than the width of the first region in the direction perpendicular to the cutting edge. ### Claim 6 (depends on 1) The cutting insert according to claim 1, wherein the inclination angle of the sixth region is equal to the inclination angle of the fourth region. ### Claim 7 (depends on 1) The cutting insert according to claim 1, wherein the first surface is inclined toward the lower surface as going farther from the cutting edge. ### Claim 8 (depends on 7) The cutting insert according to claim 7, wherein an inclination angle of the first surface is smaller than an inclination angle of the second surface. ### Claim 9 (depends on 7) The cutting insert according to claim 7, wherein an inclination angle of the second region is smaller than an inclination angle of the first region and greater than an inclination angle of the third region. ### Claim 10 (depends on 9) The cutting insert according to claim 9, wherein an inclination angle of the first surface decreases as going farther from the corner part, from the first region to the third region. ### Claim 11 (depends on 9) The cutting insert according to claim 9, wherein a decrement of the inclination angle in the second region is lower than a decrement of the inclination angle in the first region, and is higher than a decrement of the inclination angle in the third region. ### Claim 12 (depends on 1) The cutting insert according to claim 1, wherein a width of the fifth region in the direction perpendicular to the cutting edge is greater than each of a width of the fourth region in the direction perpendicular to the cutting edge and a width of the sixth region in the direction perpendicular to the cutting edge. ### Claim 13 (depends on 1) The cutting insert according to claim 1, wherein a length of the second region along the cutting edge is greater than a length of the first region along the cutting edge and is smaller than a length of the third region along the cutting edge. ### Claim 14 (depends on 1) A cutting tool, comprising: the cutting insert according to claim 1; and a holder designed to attach the cutting insert to the holder. ### Claim 15 (depends on 14) A method of manufacturing a machined product, comprising: rotating a workpiece; bringing the cutting tool according to claim 14 into contact with the workpiece being rotated; and moving the cutting tool away from the workpiece.