# US 2019/0314902 A1 · External turning tool having a cutting portion with a transverse elongated damping mechanism > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0314902 A1 - Document ID: US20190314902A1 - Status: Published application - Kind: A1 - Application number: 15/953,726 - Filed: 2018-04-16 - Published: 2019-10-17 - Earliest claimed: 2018-04-16 - Assignees: Iscar, Ltd. - Applicants: Iscar, Ltd. - Inventors: MEIR HERMAN; Jony SAFFOURI; Meir Bar HEN - Web page: https://patentgrep.com/patent/US20190314902A1 ## CPC - B23B 27/002: {with vibration damping means} - B23B 27/14: Cutting tools of which the bits or tips {or cutting inserts} are of special material - B23B 29/022: {with vibration reducing means} - B23B 2250/12: Cooling and lubrication - B23B 2250/16: Damping of vibrations - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) ## Abstract An external turning tool includes an elongated tool body with opposite clamping and cutting portions which define an axial direction therebetween. The cutting portion includes a damping mechanism with an elongated damping member which defines an elongation axis. The elongation axis forms a non-zero damping member angle with the axial direction. ## Claims ### Claim 1 A non-blade shaped external turning tool (10) comprising: an elongated tool body (12) having opposite clamping and cutting portions (16, 18) defining an axial direction (AD) therebetween; and a damping mechanism (20) at the cutting portion (18), the damping mechanism (20) comprising an elongated damping member (42) having an elongation axis (E); wherein: the elongation axis (E) forms a non-zero damping member angle (α) with the axial direction (AD). ### Claim 2 (depends on 1) The external turning tool (10) according to claim 1, wherein the damping member angle (α) ranges from 45 to 135 degrees. ### Claim 3 (depends on 1) The external turning tool (10) according to claim 1, wherein the damping member angle (α) ranges from 80 to 100 degrees. ### Claim 4 (depends on 1) The external turning tool (10) according to claim 1, wherein: the external turning tool (10) has a tool axis (T) which extends centrally within the tool body (12), parallel to the axial direction (AD); and the damping member (42) has a center of mass (CM) which is offset from the tool axis (T). ### Claim 5 (depends on 1) The external turning tool (10) according to claim 1, wherein: the damping member (42) has a maximum member length (ML) measured between extremities of the damping member (42) along the elongation axis (E); and the maximum member length (ML) is larger than a maximum member thickness (MT) measured between extremities in a direction perpendicular to the elongation axis (E). ### Claim 6 (depends on 5) The external turning tool (10) according to claim 5, wherein the maximum member length (ML) is at least 1.5 times larger than the maximum member thickness (MT). ### Claim 7 (depends on 1) The external turning tool (10) according to claim 1, wherein the cutting portion (18) has an elongated damping recess (40) configured to accommodate the damping member (42). ### Claim 8 (depends on 7) The external turning tool (10) according to claim 7, wherein: the cutting portion (18) has opposite cutting portion top and bottom surfaces (29, 31); and the damping recess (40) opens out to exactly one of the cutting portion top and bottom surfaces (29, 31). ### Claim 9 (depends on 1) The external turning tool (10) according to claim 1, wherein the damping mechanism (20) comprises an elastic member (44). ### Claim 10 (depends on 1) The external turning tool (10) according to claim 1, wherein the damping mechanism (20) further comprises a lid (48) and a calibration mechanism (46) which is configured to apply a permanent force onto the damping member (42) against an elastic member (44). ### Claim 11 (depends on 1) The external turning tool (10) according to claim 1, wherein the damping member (42) is entirely confined within the cutting portion (18), such that no portion of the damping member (42) is visible in any view of the cutting portion. ### Claim 12 (depends on 1) The external turning tool (10) according to claim 1, wherein the cutting portion (18) has opposite cutting portion side surfaces (35); and wherein the elongation axis (E) does not intersect the cutting portion side surfaces (35). ### Claim 13 (depends on 1) The external turning tool (10) according to claim 1, wherein the damping member (42) has unitary one-piece construction. ### Claim 14 (depends on 1) The external turning tool (10) according to claim 1, wherein the damping member (42) is cylindrical. ### Claim 15 (depends on 1) The external turning tool (10) according to claim 1, further comprising a coolant conveyance assembly (36) including a coolant channel (38) which extends at least through the cutting portion (18). ### Claim 16 (depends on 1) The external turning tool (10) according to claim 1, wherein: the cutting portion (18) has a different axial cross-sectional shape than that of the clamping portion (16). ### Claim 17 (depends on 1) The external turning tool (10) according to claim 1, wherein the damping mechanism (42) does not extend in a rearward direction into the clamping portion (16). ### Claim 18 (depends on 1) The external turning tool (10) according to claim 1, further comprising: a turning insert (14) removably retained in a pocket (15) of the cutting portion (16). ### Claim 19 (depends on 18) The external turning tool (10) according to claim 18, wherein: the turning insert (14) comprises a cutting edge (76) formed at an intersection between a rake surface (78) and a relief surface (80); and the elongation axis (E) extends parallel or substantially parallel to the relief surface (78). ### Claim 20 (depends on 18) The external turning tool (10) according to claim 18, wherein a plane (P) perpendicular to the axial direction (AD) intersects both the turning insert (14) and the damping mechanism (20). ### Claim 21 (depends on 18) The external turning tool (10) according to claim 18, wherein: in a top view of the external turning tool (10), a center of mass (CM) of the damping member (42) is not located directly under the turning insert (14). ### Claim 22 (depends on 18) The external turning tool (10) according to claim 18, wherein: the external turning tool (10) has a tool axis (T) which extends centrally within the tool body (12) parallel to the axial direction (AD), and in a top view of the external turning tool (10), a center of mass (CM) of the damping member (42) and the turning insert (14) are located on opposite sides of the tool axis (T). ### Claim 23 (depends on 18) The external turning tool (10) according to claim 18, wherein: the damping member (42) is entirely confined within the cutting portion (16) such that no portion of the damping member (42) is visible in any view of the cutting portion (16); and the elongation axis (E) ranges from 45 to 135 degrees. ### Claim 24 (depends on 23) The external turning tool (10) according to claim 23, wherein the cutting portion (18) has a different axial cross-sectional shape than that of the clamping portion (16). ### Claim 25 (depends on 23) The external turning tool (10) according to claim 23, wherein the damping mechanism (42) does not extend in a rearward direction into the clamping portion (16). ### Claim 26 (depends on 18) The external turning tool (10) according to claim 18, wherein: the damping member (42) is entirely confined within the cutting portion (16) such that no portion of the damping member (42) is visible in any view of the cutting portion (16); and the damping member (42) interacts with the tool body (12) via a viscous material. ### Claim 27 (depends on 26) The external turning tool (10) according to claim 26, wherein the cutting portion (18) has a different axial cross-sectional shape than that of the clamping portion (16). ### Claim 28 (depends on 26) The external turning tool (10) according to claim 26, wherein the damping mechanism (42) does not extend in a rearward direction into the clamping portion (16).