# US 10,478,901 B2 · 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 10,478,901 B2 - Document ID: US10478901B2 - Status: Granted - Kind: B2 - Application number: 15/771,129 - Filed: 2016-10-26 - Published: 2018-09-13 - Granted: 2019-11-19 - Earliest claimed: 2015-10-27 - Assignees: KYOCERA Corporation - Applicants: Kyocera Corporation - Inventors: Shin Deguchi; Masahiro Yamamoto - Web page: https://patentgrep.com/patent/US10478901B2 ## CPC - B23B 27/14: Cutting tools of which the bits or tips {or cutting inserts} are of special material - 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 2200/245: rounded - B23C 2200/0416: Irregular - B23C 2200/085: discontinuous - B23C 2200/125: discontinuous - B23C 2200/246: rounded - B23C 2226/125: cubic [CBN] - B23C 2226/315: polycrystalline [PCD] - 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 of the present disclosure includes a first surface, a second surface, and a cutting edge. The first surface includes a corner part, and a first side and a second side each extending from the corner part. The second surface connects to the first surface. The cutting edge is located at a region where the first surface intersects with the second surface. The cutting edge includes a first cutting edge located at the first side, a second cutting edge located at the second side, and a third cutting edge located at the corner part. The first cutting edge and the third cutting edge are provided with a honing. A honing width of a side of the second cutting edge in the third cutting edge decreases as going away from the first cutting edge and then approaching the second cutting edge. ## Claims ### Claim 1 A cutting insert, comprising: a first surface comprising a corner part and a first side and a second side each extending from the corner part; a second surface connected to the first surface; and a cutting edge located at a region where the first surface intersects with the second surface, wherein the cutting edge comprises: a first cutting edge located at the first side, a second cutting edge located at the second side, and a third cutting edge located at the corner part; the third cutting edge comprises: a first part connected to the first cutting edge, and a second part located between the first part and the second edge; the first cutting edge and the third cutting edge are provided with a honing in a front view of the first surface; a honing width of the first part is constant; and a honing width of the second part decreases as approaching the second cutting edge. ### Claim 2 (depends on 1) The cutting insert according to claim 1, wherein a honing width of the first cutting edge is constant. ### Claim 3 (depends on 1) The cutting insert according to claim 1, wherein the second cutting edge is a sharp edge. ### Claim 4 (depends on 1) The cutting insert according to claim 1, wherein the first part has a straight line shape in the front view of the first surface. ### Claim 5 (depends on 1) The cutting insert according to claim 1, wherein the honing width of the first part is smaller than a honing width of the second part in the front view of the first surface. ### Claim 6 (depends on 1) The cutting insert according to claim 1, wherein the second part has a straight line shape in the front view of the first surface; a first angle is formed by the first cutting edge and the first part, a second angle is formed by the first part and the second part, and a third angle is formed by the second part and the second cutting edge; and each of the first angle, the second angle, and the third angle is an obtuse angle in the front view of the first surface. ### Claim 7 (depends on 1) The cutting insert according to claim 1, wherein the first part has a first length in a direction along the second cutting edge, and the second part has a second length in the direction along the second cutting edge in the front view of the first surface; and the second length is larger than the first length. ### Claim 8 (depends on 1) The cutting insert according to claim 1, wherein a length of the first cutting edge is larger than a length of the second cutting edge. ### Claim 9 (depends on 1) A cutting tool, comprising: a holder comprising a pocket; and the cutting insert according to claim 1, the cutting insert being attached to the pocket so that at least a part of the cutting edge protrudes from the holder. ### Claim 10 (depends on 9) A method of manufacturing a machined product, comprising: rotating the cutting tool according to claim 9; bringing the cutting tool being rotated into contact with a workpiece; and moving the cutting tool away from the workpiece. ### Claim 11 A cutting insert, comprising: a first surface comprising a corner part and a first side and a second side each extending from the corner part; a second surface connected to the first surface; and a cutting edge located at a region where the first surface intersects with the second surface, wherein the cutting edge comprises: a first cutting edge located at the first side, a second cutting edge located at the second side, and a third cutting edge located at the corner part; the third cutting edge comprises: a first part connected to the first cutting edge, and a second part located between the first part and the second edge; the first cutting edge and the third cutting edge are provided with a honing in a front view of the first surface; a honing width of the first cutting edge is larger than a honing width of the third cutting edge; and a honing width of the second part decreases as approaching the second cutting edge. ### Claim 12 (depends on 11) The cutting insert according to claim 11, wherein a honing width of the first cutting edge is constant. ### Claim 13 (depends on 11) The cutting insert according to claim 11, wherein the second cutting edge is a sharp edge. ### Claim 14 (depends on 11) The cutting insert according to claim 11, wherein a honing width of the first part is constant. ### Claim 15 (depends on 11) The cutting insert according to claim 11, wherein the first part has a straight line shape in the front view of the first surface. ### Claim 16 (depends on 15) The cutting insert according to claim 15, wherein the second part has a straight line shape in the front view of the first surface; a first angle is formed by the first cutting edge and the first part, a second angle is formed by the first part and the second part, and a third angle is formed by the second part and the second cutting edge; and each of the first angle, the second angle and the third angle is an obtuse angle in the front view of the first surface. ### Claim 17 (depends on 11) The cutting insert according to claim 11, wherein the honing width of the first part is smaller than a honing width of the second part in the front view of the first surface. ### Claim 18 (depends on 11) The cutting insert according to claim 11, wherein the first part has a first length in a direction along the second cutting edge, and the second part has a second length in the direction along the second cutting edge in the front view of the first surface; and the second length is larger than the first length. ### Claim 19 (depends on 11) The cutting insert according to claim 11, wherein a length of the first cutting edge is larger than a length of the second cutting edge. ### Claim 20 (depends on 19) A cutting tool, comprising: a holder comprising a pocket; and the cutting insert according to claim 19, the cutting insert being attached to the pocket so that at least a part of the cutting edge protrudes from the holder.