# US 9,751,138 B2 · Composite milling cutter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,751,138 B2 - Document ID: US9751138B2 - Status: Granted - Kind: B2 - Application number: 14/631,905 - Filed: 2015-02-26 - Published: 2016-09-01 - Granted: 2017-09-05 - Earliest claimed: 2015-02-26 - Assignees: Kennametal Inc. - Applicants: Kennametal Inc. - Inventors: Lewis Ray Morrison; Ravishankar Iyer; Mark A. Kerin - Web page: https://patentgrep.com/patent/US9751138B2 ## CPC - B23C 5/26: Securing milling cutters to the driving spindle - B23C 5/006: {Details of the milling cutter body} - B23C 5/08: Disc-type cutters - B23F 21/128: {in exchangeable arrangement} - B23C 2210/02: Connections between the shanks and detachable cutting heads - Y10T 407/1934: with separate means to fasten tool to holder - Y10T 409/309408: with cutter holder - B23C: MILLING (broaching B23D; broach-milling in making gears B23F; arrangement for copying or controlling B23Q) - B23F: MAKING GEARS OR TOOTHED RACKS (by stamping B21D; by rolling B21H; by forging or pressing B21K; by casting B22; arrangements for copying or controlling B23Q; machines or devices for grinding or polishing, in general B24B) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A composite milling cutter includes a rotatable adapter plate and ring cutter. The adapter plate has a raised key portion with a peripheral side wall having a plurality of curved abutment surfaces symmetrically located on an inscribed circle, ICAP defined by the raised key portion. The cutter ring has an opening with a peripheral side wall for receiving the raised key portion of the adapter plate. The peripheral side wall has a plurality of curved abutment surfaces complimentary in shape to the curved abutment surfaces of the adapter plate and symmetrically located on an inscribed circle, ICCR, defined by the opening. A tolerance between the abutment surfaces of the peripheral side wall of the raised key portion and the abutment surfaces of the peripheral wall of the opening is such that run-out is minimized. ## Claims ### Claim 1 A composite milling cutter, comprising: a rotatable adapter plate having a raised key portion with a peripheral side wall, the peripheral side wall having a plurality of curved abutment surfaces symmetrically located on an inscribed circle, ICAP, defined by the raised key portion; and a cutter ring having an opening with a peripheral side wall for receiving the raised key portion of the adapter plate, the peripheral side wall having a plurality of curved abutment surfaces complimentary in shape to the curved abutment surfaces of the adapter plate and symmetrically located on an inscribed circle, ICCR, defined by the opening, Wherein a tolerance between the abutment surfaces of the peripheral side wall of the raised key portion and the abutment surfaces of the peripheral wall of the opening is such that run-out is minimized; wherein the raised key portion further comprises a plurality of lobes extending radially outward with respect to the inscribed circle, ICAP; wherein the cutter ring further comprises a plurality of lobe-shaped openings extending radially outward with respect to the inscribed circle, ICCR; and wherein the tolerance between the abutment surfaces of the peripheral side wall of the raised key portion and the abutment surfaces of the peripheral wall of the opening is tighter than a tolerance between the plurality of lobes and the plurality of lobe-shaped openings. ### Claim 2 (depends on 1) The composite milling cutter of claim 1, wherein the composite milling cutter defines a central axis, a Y-axis which is perpendicular to and passes through the central axis, and an X-axis which is perpendicular to the central axis and the Y-axis and which passes through the central axis; and wherein a center of each of the curved abutment surfaces of the adapter plate are centrally located on lines that pass through a central axis one of the X-axis and the Y-axis of the composite milling cutter, and wherein a center of each of the curved abutment surfaces of the cutter ring are centrally located on lines that pass through the central axis one of the X-axis and the Y-axis of the composite milling cutter. ### Claim 3 (depends on 1) The composite milling cutter of claim 1, wherein the raised key portion has a total of four convex abutment surfaces that are located ninety degrees apart from each other, and wherein the cutter ring has a total of four concave abutment surfaces that are located ninety degrees apart from each other. ### Claim 4 (depends on 1) The composite milling cutter of claim 1, wherein the peripheral wall of the raised key portion further comprises a plurality of lobe abutment surfaces, and wherein the peripheral side wall of the cutter ring further comprises a plurality of lobe abutment surfaces. ### Claim 5 (depends on 4) The composite milling cutter of claim 4, wherein the composite milling cutter defines a central axis, a Y-axis which is perpendicular to and passes through the central axis, and an X-axis which is perpendicular to the central axis and the Y-axis and which passes through the central axis; and wherein a center of each of the plurality of lobe abutment surfaces of the raised key portion are located on a bisector, B, between the X-axis and the Y-axis of the composite milling cutter, and wherein a center of each of the plurality of lobe abutment surfaces of the cutter ring are located on the bisector, B, between the X-axis and the Y-axis of the composite milling cutter. ### Claim 6 (depends on 4) The composite milling cutter of claim 4, wherein the lobe abutment surfaces of the raised key portion are located ninety degrees apart from each other, and wherein the lobe abutment surfaces of the cutter ring are located ninety degrees apart from each other. ### Claim 7 (depends on 4) The composite milling cutter of claim 4, wherein a tolerance between the lobe abutment surfaces of the adapter plate and the lobe abutment surfaces of the cutter ring minimizes relative rotation of the adapter plate with respect to the cutter ring. ### Claim 8 (depends on 7) The composite milling cutter of claim 7, wherein the tolerance between the lobe abutment surfaces of the adapter plate and the lobe abutment surfaces of the cutter ring is 1 mm. ### Claim 9 (depends on 1) The composite milling cutter of claim 1, wherein the tolerance between the abutment surfaces of the peripheral side wall of the raised key portion and the abutment surfaces of the peripheral wall of the opening is less than 15 microns. ### Claim 10 A composite milling cutter, comprising: a rotatable adapter plate having a raised key portion with a peripheral side wall, the peripheral side wall having a plurality of curved abutment surfaces symmetrically located on an inscribed circle, ICAP, defined by the raised key portion, the raised key portion further comprising a plurality of lobes extending radially outward with respect to the inscribed circle, ICAP; and a cutter ring having an opening with a peripheral side wall for receiving the raised key portion of the adapter plate, the peripheral side wall having a plurality of curved abutment surfaces complimentary in shape to the curved abutment surfaces of the adapter plate and symmetrically located on an inscribed circle, ICCR, defined by the opening, the cutter ring further comprises a plurality of lobe-shaped openings extending radially outward with respect to the inscribed circle, ICCR, wherein a tolerance between the curved abutment surfaces of the peripheral side wall of the raised key portion and the curved abutment surfaces of the peripheral side wall of the opening minimizes run-out, and wherein a tolerance between the lobe abutment surfaces of the adapter plate and the lobe abutment surfaces of the cutter ring minimizes relative rotation of the adapter plate with respect to the cutter ring; and wherein the tolerance between the lobe abutment surfaces of the adapter plate and the lobe abutment surfaces of the cutter ring permits a maximum relative rotation of about 1 mm. ### Claim 11 (depends on 10) The composite milling cutter of claim 10, wherein the composite milling cutter defines a central axis, a Y-axis which is perpendicular to and passes through the central axis, and an X-axis which is perpendicular to the central axis and the Y-axis and which passes through the central axis; and wherein a center of each of the curved abutment surfaces of the adapter plate are centrally located on lines that pass through a central axis one of the X-axis and the Y-axis of the composite milling cutter, and wherein a center of each of the curved abutment surfaces of the cutter ring are centrally located on lines that pass through the central axis one of the X-axis and the Y-axis of the composite milling cutter. ### Claim 12 (depends on 10) The composite milling cutter of claim 10, wherein the raised key portion has a total of four convex abutment surfaces that are located ninety degrees apart from each other, and wherein the opening has a total of four concave abutment surfaces that are located ninety degrees apart from each other. ### Claim 13 A composite milling cutter, comprising: a rotatable adapter plate having a raised key portion with a peripheral side wall, the peripheral side wall having a plurality of curved abutment surfaces symmetrically located on an inscribed circle, ICAP, defined by the raised key portion, the peripheral side wall further comprising a plurality of lobe abutment surfaces, the raised key portion further comprising a plurality of lobes extending radially outward with respect to the inscribed circle, ICAP; and a cutter ring having an opening with a peripheral side wall for receiving the raised key portion of the adapter plate, the peripheral side wall having a plurality of curved abutment surfaces complimentary in shape to the curved abutment surfaces of the adapter plate and symmetrically located on an inscribed circle, ICCR, defined by the opening, the peripheral side wall of the cutter ring further comprises a plurality of lobe abutment surfaces, the cutter ring further comprises a plurality of lobe-shaped openings extending radially outward with respect to an inscribed circle, ICCR, wherein a tolerance between the curved abutment surfaces of the peripheral side wall of the raised key portion and the curved abutment surfaces of the peripheral side wall of the opening minimizes run-out, and wherein a tolerance between the lobe abutment surfaces of the adapter plate and the lobe abutment surfaces of the cutter ring minimizes relative rotation of the adapter plate with respect to the cutter ring; and wherein the tolerance between the lobe abutment surfaces of the adapter plate and the lobe abutment surfaces of the cutter ring is about 2 mm. ### Claim 14 (depends on 13) The composite milling cutter of claim 13, the composite milling cutter defines a central axis, a Y-axis which is perpendicular to and passes through the central axis, and an X-axis which is perpendicular to the central axis and the Y-axis and which passes through the central axis; and wherein a center of each of the curved abutment surfaces of the adapter plate are centrally located on lines that pass through a central axis one of the X-axis and the Y-axis of the composite milling cutter, and wherein a center of each of the curved abutment surfaces of the cutter ring are centrally located on lines that pass through the central axis one of the X-axis and the Y-axis of the composite milling cutter. ### Claim 15 (depends on 13) The composite milling cutter of claim 13, wherein the lobe abutment surfaces of the raised key portion are located ninety degrees apart from each other, and wherein the lobe abutment surfaces of the cutter ring are located ninety degrees apart from each other. ### Claim 16 (depends on 13) The composite milling cutter of claim 13, wherein the curved abutment surfaces of the adapter plate have a convex shape, and wherein the curved abutment surfaces of the cutter ring have a concave shape.