# US 2014/0154019 A1 · Cutting insert with scallops > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0154019 A1 - Document ID: US20140154019A1 - Status: Published application - Kind: A1 - Application number: 14/094,836 - Filed: 2013-12-03 - Published: 2014-06-05 - Earliest claimed: 2012-12-04 - Assignees: Kennametal India Limited - Applicants: Kennametal India Limited - Inventors: Sreekala Pacheri - Web page: https://patentgrep.com/patent/US20140154019A1 ## CPC - B23B 27/143: {characterised by having chip-breakers} - B23B 2200/0447: Parallelogram - Y10T 407/235: with integral chip breaker, guide or deflector - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A polygonal indexable cutting insert including a pair of faces, a plurality of peripheral side surfaces, a plurality of rounded corners, a plurality of cutting edges formed with an edge radius, a plurality of triangular-shaped areas proximate the rounded corners; and a plurality of chip breaking scallops positioned along the cutting edges. Each scallop has a bottom surface formed by a rake face and an arcuate back wall having a varying depth. The arcuate back wall of each scallop intersects the arcuate back wall of adjacent scallops at a point located at a distance from each cutting edge for providing a wedge effect that facilitates in dividing and breaking chips. ## Claims ### Claim 1 A polygonal indexable cutting insert, comprising: a pair of faces and a plurality of peripheral side surfaces normal to said parallel faces, said faces and said side surfaces being joined to form rounded corners, each face having a rake face and a central plateau; a plurality of cutting edges formed at an intersection between said faces and plurality of side surfaces; and a plurality of chip breaking scallops positioned along the cutting edges, each scallop comprises a bottom surface formed by the rake face and an arcuate back wall joining said bottom surface and said central plateau to form a chip breaker, wherein said central plateau of each face includes a triangular-shaped area proximate the rounded corners, each triangular-shaped area including an apex that lies along a bisector passing through a central axis and opposite rounded corners. ### Claim 2 (depends on 1) The cutting insert according to claim 1, wherein the rake face slopes inwardly and downwardly with respect to the cutting edges at an angle in a range between 10 degrees to 12 degrees. ### Claim 3 (depends on 1) The cutting insert according to claim 1, wherein both the cutting edges and the rounded corners are formed with an edge radius having a radius, R, in a range between 0.01 mm to 0.02 mm. ### Claim 4 (depends on 3) The cutting insert according to claim 3, wherein a difference in elevation between the central plateau and the edge radius defines a height in a range between 0.08 mm to 0.12 mm. ### Claim 5 (depends on 1) The cutting insert according to claim 1, wherein a depth of the arcuate back wall of each scallop varies, thereby increasing side curl of the chips and formation of short helical chips. ### Claim 6 (depends on 1) The cutting insert according to claim 1, wherein the arcuate back wall of each scallop extends upwardly from a bottom to the central plateau. ### Claim 7 (depends on 1) The cutting insert according to claim 1, wherein the arcuate back wall of each scallop intersects the arcuate back wall of adjacent scallops at a point for providing a wedge effect that facilitates in dividing and breaking chips. ### Claim 8 (depends on 7) The cutting insert according to claim 7, wherein the point at which the back wall of each scallop intersect one another is located at a distance from each cutting edge. ### Claim 9 A polygonal indexable cutting insert comprising: a pair of faces and a plurality of peripheral side surfaces normal to said parallel faces, said faces and said side surfaces being joined to form rounded corners, each face having a central plateau that includes a triangular-shaped area proximate each rounded corner; a plurality of cutting edges formed at an intersection between said faces and plurality of side surfaces, each cutting edge formed with an edge radius; a rake face extending inwardly and downwardly at an angle with respect to a plane that is parallel to the pair of faces; and a plurality of chip breaking scallops positioned along the cutting edges comprising a bottom surface formed by the rake face and an arcuate back wall joining said bottom surface and said central plateau to form a chip breaker, wherein a depth of the arcuate back wall of each scallop varies, thereby increasing side curl of the chips and formation of short helical chips. ### Claim 10 (depends on 9) The cutting insert according to claim 9, wherein said central plateau of each face includes a triangular-shaped area proximate the rounded corners, each triangular-shaped area including an apex that lies along a bisector passing through a central axis and opposite rounded corners. ### Claim 11 (depends on 9) The cutting insert according to claim 9, wherein the arcuate back wall extends upwardly from a bottom to the central plateau. ### Claim 12 (depends on 9) The cutting insert according to claim 9, wherein a difference in elevation between the central plateau and the edge radius defines a height in a range between 0.08 mm to 0.12 mm. ### Claim 13 (depends on 9) The cutting insert according to claim 9, wherein the arcuate back wall of each scallop intersects the arcuate back wall of adjacent scallops at a point for providing a wedge effect that facilitates in dividing and breaking chips. ### Claim 14 (depends on 13) The cutting insert according to claim 13, wherein the point at which the back wall of each scallop intersect one another is located at a distance from each cutting edge. ### Claim 15 (depends on 9) The cutting insert according to claim 9, wherein the depth of the arcuate back wall is smallest proximate the point and largest between adjacent points. ### Claim 16 A polygonal indexable cutting insert, comprising: a pair of faces and a plurality of peripheral side surfaces normal to said parallel faces, said faces and said side surfaces being joined to form rounded corners, each face having a central plateau that includes a triangular-shaped area proximate each rounded corner; a plurality of cutting edges formed at an intersection between said faces and plurality of side surfaces, each cutting edge formed with an edge radius; a rake face extending inwardly and downwardly at an angle with respect to a plane that is parallel to the pair of faces; a triangular-shaped area proximate the rounded corners, each triangular-shaped area including an apex that lies along a bisector passing through a central axis and opposite rounded corners; and a plurality of chip breaking scallops positioned along the cutting edges comprising a bottom surface formed by the rake face and an arcuate back wall joining said bottom surface and said central plateau to form a chip breaker, wherein the arcuate back wall of each scallop intersects the arcuate back wall of adjacent scallops at a point located at a distance from each cutting edge for providing a wedge effect that facilitates in dividing and breaking chips, and wherein a depth of the arcuate back wall of each scallop is smallest proximate the point and largest between adjacent points, thereby increasing side curl of the chips and formation of short helical chips. ### Claim 17 (depends on 16) The cutting insert according to claim 16, wherein a difference in elevation between the central plateau and the edge radius defines a height in a range between 0.08 mm to 0.12 mm. ### Claim 18 (depends on 16) The cutting insert according to claim 16, wherein the edge radius has a radius, R, in a range between 0.01 mm to 0.02 mm.