WO2011142297A1 - 切削インサート - Google Patents
切削インサート Download PDFInfo
- Publication number
- WO2011142297A1 WO2011142297A1 PCT/JP2011/060589 JP2011060589W WO2011142297A1 WO 2011142297 A1 WO2011142297 A1 WO 2011142297A1 JP 2011060589 W JP2011060589 W JP 2011060589W WO 2011142297 A1 WO2011142297 A1 WO 2011142297A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chip breaker
- cutting
- nose
- cutting edge
- breaker
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/22—Cutting tools with chip-breaking equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
- B23B27/1603—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with specially shaped plate-like exchangeable cutting inserts, e.g. chip-breaking groove
- B23B27/1607—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with specially shaped plate-like exchangeable cutting inserts, e.g. chip-breaking groove characterised by having chip-breakers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
- B23B27/143—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness characterised by having chip-breakers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/08—Rake or top surfaces
- B23B2200/081—Rake or top surfaces with projections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/08—Rake or top surfaces
- B23B2200/086—Rake or top surfaces with one or more grooves
- B23B2200/087—Rake or top surfaces with one or more grooves for chip breaking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/20—Top or side views of the cutting edge
- B23B2200/201—Details of the nose radius and immediately surrounding area
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/32—Chip breaking or chip evacuation
- B23B2200/321—Chip breaking or chip evacuation by chip breaking projections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/32—Chip breaking or chip evacuation
- B23B2200/323—Chip breaking or chip evacuation by chip breaking depressions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/08—Rake or top surfaces
- B23C2200/081—Rake or top surfaces with projections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/20—Top or side views of the cutting edge
- B23C2200/201—Details of the nose radius and immediately surrounding areas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/32—Chip breaking or chip evacuation
- B23C2200/323—Chip breaking or chip evacuation by chip-breaking projections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/32—Chip breaking or chip evacuation
- B23C2200/326—Chip breaking or chip evacuation by chip-breaking grooves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
- Y10T407/235—Cutters, for shaping including tool having plural alternatively usable cutting edges with integral chip breaker, guide or deflector
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/24—Cutters, for shaping with chip breaker, guide or deflector
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/24—Cutters, for shaping with chip breaker, guide or deflector
- Y10T407/245—Cutters, for shaping with chip breaker, guide or deflector comprising concave surface in cutting face of tool
Definitions
- the present invention relates to a cutting insert that is detachably attached to a tool body and used for cutting a metal material.
- the cutting insert disclosed in Patent Document 1 has a substantially polygonal plate shape, and at least one nose portion thereof stands upward from a rake face and has a standing wall surface protruding toward the tip of the nose portion. And a rake face connected to at least the entire circumference or a part of the standing wall surface extends from the cutting edge inwardly, and extends inward following the first rake face. And it is comprised by the 2nd rake face connected to the said standing wall surface.
- the cutting insert of Patent Document 1 is designed so that it can be applied to a tool material having inferior heat cracking resistance such as cermet, from so-called finish cutting to light cutting, which has excellent heat cracking resistance and a small cutting amount and feed amount. ing.
- cermet inferior heat cracking resistance
- the cutting insert of Patent Document 1 functions effectively from finishing to light cutting, it often does not function very effectively under heavy cutting conditions. Therefore, the cutting insert of patent document 1 cannot respond to the cutting conditions from light cutting to heavy cutting with one cutting insert.
- the present invention has been made to solve the above problems. That is, an object is to provide a cutting insert that can effectively cope with cutting conditions from light cutting to heavy cutting with one cutting insert.
- the cutting insert of the present invention has a substantially polygonal plate shape, a rake face is formed on at least one of the upper and lower faces, a flank face is formed on an outer peripheral surface extending between the upper and lower faces, and the rake face and the flank face
- An arcuate cutting edge located in at least one nose that curves in an arc, an action cutting edge extending from one side of the arcuate cutting edge, and the other side of the arcuate cutting edge
- a nose chip breaker recess is formed in the vicinity of the arcuate cutting edge on the rake face, and the nose
- the breaker projection rises from the bottom surface of the chip breaker recess, and the nose chip breaker recess is curved in a concave shape from the periphery on the nose portion side to the bottom surface.
- the cutting insert according to the present invention improves chip disposal performance when used in heavy cutting and light cutting conditions where the cutting conditions are gentler than that, and abnormal damage such as defects. Does not occur.
- the reason why the nose chip breaker recess can improve the chip processing performance on the light cutting side is the difference in the height of the chip breaker that occurs relative to the depth of the chip breaker groove. The larger the chip breaker height difference, the stronger the restraint force when the chips collide, and the chip processing performance that stabilizes the chips in light cutting conditions where the outflow of the chips tends to become unstable. Can be improved. Therefore, the application range can be expanded to the light cutting side based on the chip breaker shape for heavy cutting. When used on the light cutting side, the chip breaker recess of the nose portion mainly draws the chips, and the breaker projections that have a relatively large difference in height treat the chips appropriately.
- the nose chip breaker concave portion is smoothly connected to the bottom surface portion from the peripheral portion on the nose portion side to the bottom surface portion while being curved in a concave shape and gradually inclined toward the bottom surface portion.
- FIG. 1 is a plan view of a cutting insert according to the first embodiment.
- FIG. 2 is a front view of the cutting insert shown in FIG. 3 is an enlarged plan view of the vicinity of the nose portion of the cutting insert shown in FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 5 is a cross-sectional view taken along line VV in FIG. 6 is a sectional view taken along line VI-VI in FIG. 7 is a cross-sectional view taken along line VII-VII in FIG.
- FIG. 8 is an enlarged plan view of the vicinity of the nose portion of the cutting insert according to the second embodiment.
- FIG. 1 is a plan view of a cutting insert according to the first embodiment.
- FIG. 2 is a front view of the cutting insert shown in FIG. 3 is an enlarged plan view of the vicinity of the nose portion of the cutting insert shown in FIG.
- the cutting insert according to the present embodiment is a cutting insert that is symmetric with respect to the bisector B of the apex angle of the nose portion without any permission.
- the cutting insert according to the present invention is not limited to a cutting insert without a right hand, the cutting insert described below is used as a right hand and has a function cutting that takes most of the cutting when cutting the straight cutting edge 6b.
- the main cutting edge of the blade is used and the linear cutting edge 6c is the sub cutting edge (front cutting edge) of the working cutting edge
- the straight cutting edge 6c is the main cutting edge of the working cutting edge
- the linear cutting edge 6b is the auxiliary cutting edge.
- 4 is a cross-sectional view taken along line IV-IV in FIG.
- the IV-IV line is a line on the bisector B of the apex angle defined by the nose portion 5.
- the apex angle referred to here is an angle between the nose portion 5 among the angles formed by the linear cutting edge 6b and the linear cutting edge 6c.
- VV line is a cross section of the chip breaker groove 10 in the vicinity of the peripheral edge 41a of the nose chip breaker recess 40 on the straight cutting edge 6b side in a direction orthogonal to the straight cutting edge 6b of the main cutting edge of the cutting edge 6.
- a line “near the peripheral edge portion 41a” is an area as close as possible to the peripheral edge portion 41a on the linear cutting edge 6b side of the nose portion chip breaker recess 40 shown in FIG. 3 in the cross-sectional line where the bottom portion 10c of the chip breaker groove appears. Refers to that.
- the bottom portion 10c of the chip breaker groove is the deepest portion when viewed in a cross section perpendicular to the straight cutting edge 6b. If there is a flat surface at the bottom 10c of the chip breaker groove, a straight line appears in the cross section. If a straight line does not appear, the deepest point is taken as the bottom 10c of the chip breaker groove.
- 6 is a cross-sectional view taken along line VI-VI in FIG.
- a VI-VI line is an arbitrary cross-sectional line that intersects with the peripheral edge portion 41b on the side far from the linear cutting edge 6b of the nose tip breaker recess 40 shown in FIG. 3 in a direction orthogonal to the linear cutting edge 6b.
- a line VII-VII is a cross-sectional line at a position where the breaker projection 20 is closest to the linear cutting edge 6b in a direction orthogonal to the linear cutting edge 6b.
- the line VII-VII is moved from the position where the breaker protrusion 20 comes closest to the straight cutting edge 6b for the purpose of making the drawing easy to see. Shown at a slightly shifted position.
- the “chip processing” used in the following description is caused by chips when cutting such as generated chips entangled with the tool body or scattered. This means solving various problems that occur. Therefore, a cutting insert having a “high chip controllability” is less likely to cause trouble during the cutting process than a cutting insert having a “chip controllability”.
- the cutting insert 1 has a substantially rhombic plate shape, a cutting edge 6 is formed on the periphery of the upper surface 2 and the lower surface 3 on which the rake face 2 a is formed, and is perpendicular to the upper surface 2 and the lower surface 3.
- the outer peripheral surface 4 extending between the upper surface 2 and the lower surface 3 is a flank 4a.
- the cutting edge 6 has an arc cutting edge 6a provided on the nose portion 5 of the 80 ° corner and a pair of linear cutting edges 6b and 6c extending from the arc cutting edge 6a.
- the flank 4a is a flank that is perpendicular to the upper surface 2 and the lower surface 3 and has a flank angle (parallel to the central axis CL) of 0 °.
- the material of the cutting insert is selected from hard materials such as cemented carbide, cermet, and ceramic, or those obtained by coating the surface of these hard materials with a PVD or CVD coating film.
- a chip breaker groove 10 is formed on the rake face of the upper surface 2 and the lower surface 3, and along the periphery thereof, as shown in FIG. 1 and FIG.
- a narrow land 42 extending in the direction is formed.
- a boss surface 30 is formed at the center of the upper surface 2 and the lower surface 3.
- the boss surface 30 is formed so as to surround the cylindrical mounting hole 50 penetrating the upper surface 2 and the lower surface 3 in the thickness direction, and is a flat surface higher than the cutting edge 6 in the thickness direction of the cutting insert. Yes.
- the boss surface 30 functions as a seating surface that comes into contact with the bottom surface of the tip seat when the cutting insert is attached to a tip seat (not shown) provided on a tool body of a cutting tool such as a cutting tool.
- the breaker protrusion 20 as a chip breaker rises from the bottom surface portion 40 c of the nose portion chip breaker recess 40 in the direction of the bisector B of the apex angle defined by the nose portion 5.
- the wall surface 22 stands up.
- the cutting insert 1 is provided with a nose portion chip breaker recess 40 only between the nose portion 5 and the breaker protrusion 20. For this reason, the height difference of the chip breaker part which a chip touches at the time of heavy cutting becomes small appropriately, and the height difference of the chip breaker part which a chip touches at the time of light cutting becomes large appropriately. As a result, the cutting insert 1 can appropriately handle chips generated during heavy cutting and chips generated during light cutting.
- the standing wall surface 22 of the breaker projection 20 rises from the bottom surface portion 40c of the nose portion chip breaker recess 40 to further improve the chipability of light cutting.
- a standing wall surface 22 is formed on the periphery of the breaker protrusion 20. In this embodiment, the height of the top portion of the breaker protrusion 20 is the same as that of the boss surface 30.
- the nose portion chip breaker concave portion 40 has a bottom surface portion 40c from the peripheral edge portion 40a to the bottom surface portion 40c on the side of the nose portion 5 curved in a concave shape with a curvature radius R1 of a predetermined value or more and gradually inclined toward the bottom surface portion 40c. It becomes the inclined surface 40b connected smoothly.
- the peripheral portion 40a on the nose portion 5 side is shown as a curve where the land 42 and the inclined 40b surface intersect, but when the land 42 and the inclined 40b surface are connected smoothly.
- the connection portion is the peripheral portion 40a.
- the curvature radius R1 of the inclined surface 40b is 1 mm or more, and preferably 2 mm or more and 3 mm or less.
- the curvature radius R1 of the inclined surface 40b is the above-mentioned size, chip disposal performance under the cutting conditions on the light cutting side is improved, and at the same time, chipping during heavy cutting is prevented. If this curvature radius R1 is less than 1 mm, it cannot withstand the load during heavy cutting, and may become the starting point of a defect due to stress concentration or the like. Moreover, when this curvature radius R1 exceeds 4 mm, the chip
- heavy cutting refers to cutting conditions of, for example, carbon steel turning with a maximum cut of 3 mm or more and a maximum feed of 0.3 mm / rev or more
- light cutting means a cut of 1.0 to 3 mm and a maximum feed of 0 mm.
- the curvature radius R1 of the inclined surface 40b is also related to the size of the cutting insert. This is because the larger the size of the cutting insert, the more likely it is used under higher cutting conditions.
- the curvature radius R1 of the inclined surface 40b is preferably 5% or more and 30% or less of the reference inscribed circle of the cutting insert.
- the bottom surface portion 40c of the nose portion chip breaker recess 40 forms a flat surface.
- the continuous line which shows this planar range is shown in figure.
- the roundness connected to the bottom surface portion 40c is a radius of curvature R1 of the roundness that contacts the plane of the bottom surface portion 40c from the cutting edge 6 side.
- the inclined surface 40b is connected to the bottom surface portion 40c with a constant curvature radius from the peripheral edge portion 40a.
- the bottom surface portion 40c does not necessarily have a flat surface, and may be a curved surface.
- the bottom surface portion 40c When the bottom surface portion 40c is a curved surface, since there is no flat surface, the bottom surface portion 40c includes the deepest portion of the curved surface.
- the radius of curvature R1 of the inclined surface 40b connected to the bottom surface portion 40c does not need to be constant, and the size thereof may be changed in the nose portion chip breaker recess 40. For example, it is also effective to increase the radius of curvature R1 as it is closer to the nose portion 5 and to decrease it as it approaches the peripheral edge portion 41a on the linear cutting edge 6b side of the nose portion chip breaker recess 40 (not shown). Further, the inclined surface 40b may not be connected to the bottom surface portion 40c with a constant radius of curvature from the peripheral edge portion 40a on the nose portion 5 side.
- the cross-sectional shape of the inclined surface 40b may be a short straight line from the peripheral edge 40a, and may be connected to the bottom surface 40c with a certain radius of curvature following the straight line.
- the radius of curvature when connecting to the bottom surface portion 40c is important.
- the chip breaker groove 10 has a narrow land 42 extending inwardly from the straight cutting edge 6b. Is provided.
- the chip breaker groove 10 is inclined such that the peripheral edge portion 10a on the linear cutting edge 6b side to the bottom portion 10c of the breaker groove is concavely curved and is gradually connected to the bottom portion while being gradually inclined toward the bottom portion. It is the surface 10b.
- the radius of curvature of the inclined surface 10b is R2.
- the radius of curvature R2 may be smaller than the radius of curvature R1 of the inclined surface 40b of the nose portion chip breaker recess 40.
- the radius of curvature R2 of the inclined surface 10b of the chip breaker groove 10 can be set to 0.5 mm or less, for example.
- the binding force on the chips is too strong during heavy cutting. If the chips are strongly constrained during heavy cutting, it becomes easy to cause abnormal damage such as deterioration of the machined surface roughness and cutting insert defects due to increased cutting resistance and chatter vibration.
- the nose portion chip breaker recess 40 only between the vicinity of the nose portion 5 and the vicinity of the tip of the breaker protrusion 20, the average value of the breaker depth during heavy cutting becomes shallow. Therefore, the height difference of the wall of the chip breaker acting at the time of heavy cutting becomes smaller than that at the time of light cutting, and the chip restraining force does not become too strong. Therefore, the cutting insert 1 can process chips appropriately.
- the nose part chip breaker recess 40 also has an effect of reducing the contact area between the cutting insert 1 and the chip by causing chips generated during heavy cutting to rise up without being drawn into the nose part chip breaker recess 40. is there.
- the contact area between the cutting insert 1 and the chips decreases, the cutting resistance decreases, the heat generation amount is suppressed, the wear of the tool is suppressed, and the tool life is prolonged.
- the wall surface 22 of at least one breaker projection 20 is raised from the bottom surface portion 40 c of the nose portion chip breaker recess 40 in order to raise chips during heavy cutting in the nose portion chip breaker recess 40.
- first concave peripheral edge portion 41a As the ridgeline of the peripheral edge portion 41a on the linear cutting edge 6b side of the nose portion chip breaker concave portion 40 (hereinafter, this portion is referred to as "first concave peripheral edge portion 41a") is separated from the nose portion 5 as the distance from the cutting edge increases.
- first concave peripheral edge portion 41a When formed so as to be separated from each other, there is no barrier to the direction of chip discharge during heavy cutting, and the first recess peripheral portion 41a is effectively prevented from acting as a chip breaker. Therefore, chips generated at the time of heavy cutting are lifted by the nose chip breaker concave portion 40, and the adverse effect of heavy cutting due to the presence of the concave portion is solved.
- the shape of the first recess peripheral edge portion 41a is represented by an angle ⁇ formed with the linear cutting edge 6b, it is preferable that 40 ° ⁇ ⁇ ° ⁇ 85 °.
- the ridge line of the first recessed portion peripheral edge portion 41a does not need to be a straight line, and may be separated from the nose portion 5 as being separated from the cutting edge 6, for example, as shown in FIG. Further, as another shape, a convex curve, a concave curve, or a curve obtained by combining irregularities and straight lines may be used.
- the chip breaker acts only in the range where it comes into contact with the chip, the shape from the cutting edge 6 to the contact area with the chip is important, and the shape of the part sufficiently away from the cutting edge 6 is particularly important. is not.
- the chip contact range varies depending on the cutting conditions and the work material.
- the rising angle ⁇ 1 of the wall surface of the nose chip breaker recess 40 on the peripheral edge 41b far from the linear cutting edge 6b (hereinafter referred to as “second recess peripheral edge 41b”) is determined by the rising of the breaker protrusion 20
- the rising angle ⁇ 2 of the wall surface 22 is smaller. That is, by satisfying ⁇ 1 ⁇ 2, the second recessed portion peripheral edge 41b does not act as a chip breaker during heavy cutting.
- whether or not the rising angle in the direction opposite to the chip outflow direction is such that the first recessed portion peripheral portion 41a and the second recessed portion peripheral portion 41b function as a chip breaker.
- the wall surface rising angle is a cross-section in a direction perpendicular to the straight cutting edge 6b close to the chip discharge direction during heavy cutting. Is defined.
- the position is set to an appropriate reference.
- the boss surface 30 After setting the reference position, the rising angle ⁇ 1 of the wall surface at a height away from the reference position by a certain distance is compared with the rising angle ⁇ 2 of the rising wall surface 22 of the breaker projection 20.
- the rising angles ⁇ 1 and ⁇ 2 in the vicinity of the upper surface cannot be compared.
- the rising angle ⁇ 1 of the wall surface is smaller than the rising angle ⁇ 2 of the rising wall surface 22.
- it is meaningless to compare the tangent angles at the upper part of the arc so in this case also the tangent angles at the same height are compared as ⁇ 1 and ⁇ 2, respectively.
- the first recess peripheral edge portion 41a starts from a position about 0.1 mm to 3 mm away from the nose portion 5 and is arranged so as to be separated from the nose portion 5 as it is separated from the cutting edge 6. Yes.
- An appropriate value is selected as the position at which the first recess peripheral portion 41 a starts in relation to the corner radius of the nose portion 5.
- the nose part chip breaker recess 40 is formed symmetrically with respect to the bisector B of the apex angle of the nose part 5 because the tool usage direction is mainly on the right side with respect to the nose part 5.
- the first recessed portion peripheral portion 41a and the second recessed portion peripheral portion 41b are originally designed to have different ridge line shapes and wall rising angles required for their functions, but in this embodiment, the nose While the partial chip breaker recess 40 is formed symmetrically with respect to the bisector B of the apex angle of the nose portion 5, the ridge line shape as described above of the first recess peripheral portion 41a and the second recess peripheral portion 41b is simultaneously formed. And the magnitude relationship between the rising angle ⁇ 1 of the wall surface and the rising angle ⁇ 2 of the rising wall surface 22 are compatible. Therefore, the same cutting performance can be obtained for the use of both the left and right cutting edges.
- the rake face 2a has a comparatively smooth cross-sectional shape as shown in FIGS.
- the rake angle can be changed stepwise in the cross-sectional shape, such as the first rake angle and the second rake angle. Further, the rake angle can be changed continuously or intermittently along the cutting edge 6 as the distance from the nose portion 5 increases.
- the cutting insert of the present invention is not limited to the embodiment described above, and various modifications and additions are possible within a range not departing from the gist of the present invention.
- the outer shape of the cutting insert may be a polygonal plate shape other than the rhombus plate shape, or may be a so-called positive cutting insert having a clearance angle larger than 0 °.
- the chip breaker groove 10 does not need to be provided over the entire circumference of the cutting edge 6 and can be provided limited to a desired range.
- the number of breaker protrusions 20 is not necessarily one, and it is also effective to provide a plurality of breaker protrusions around the nose portion and to appropriately handle various chip discharge directions.
- the standing wall surface 22 of the breaker protrusion 20 what was comprised by the standing wall surface which consists of a single and several plane or a curved surface may be sufficient.
- a honing made of a flat or curved chamfer is added to the cutting edge ridge line along the cutting edge 6, or the land 42 of the cutting edge ridge is inclined at a negative angle. Or you may. On the contrary, the land 42 may be inclined with a positive angle for the purpose of lowering the cutting resistance.
- the cutting insert of the present invention can also be applied to a thread cutting insert (not shown) and a rolling insert (not shown).
- the cutting insert of the present invention can be used for cutting a metal material by being detachably mounted on a tool body in the same manner as a conventional cutting insert.
- the manufacturing method is the same as that of the conventional cutting insert.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Milling Processes (AREA)
- Drilling Tools (AREA)
Abstract
Description
第1実施形態
Claims (5)
- 略多角形板状をなし、上下面の少なくとも一方にすくい面を有するチップブレーカが形成され、前記上下面の間で延びる外周面に逃げ面が形成され、前記すくい面と逃げ面との交差稜線部には、円弧状に湾曲する少なくとも1つのノーズ部に位置する円弧状切れ刃と、該円弧状切れ刃の一方側から延びる作用切れ刃と、前記円弧状切れ刃の他方側から延びる直線状切れ刃とを有する切れ刃が形成された切削インサートにおいて、
前記すくい面には、前記円弧状切れ刃の近傍に、ノーズ部チップブレーカ凹部が形成され、
前記ノーズ部チップブレーカ凹部の底面部からブレーカ突起が立ち上がっており、前記ノーズ部チップブレーカ凹部は、前記ノーズ部側の周縁部から前記底面部までが、凹状に湾曲しかつ前記底面部に向けて徐々に傾斜しつつ当該底面部に滑らかに接続される傾斜面となっている、ことを特徴とする切削インサート。 - 前記すくい面には、前記ノーズ部チップブレーカ凹部およびブレーカ突起に隣接してチップブレーカ溝が形成され、
前記チップブレーカ溝は、前記作用切れ刃側の周縁部から当該チップブレーカ溝の底部までが、凹状に湾曲しかつ前記底部に向けて徐々に傾斜しつつ当該底部に滑らかに接続される傾斜面となっており、
前記チップブレーカ溝の傾斜面の曲率半径R2が、前記ノーズ部チップブレーカ凹部の傾斜面の曲率半径R1よりも小さいことを特徴とする請求項1に記載の切削インサート。 - 前記ノーズ部チップブレーカ凹部の前記チップブレーカ溝側の周縁部は、前記ノーズ部側から前記ブレーカ突起側に向けて延在することを特徴とする請求項1又は2に記載の切削インサート。
- 前記ノーズ部チップブレーカ凹部は、当該ノーズ部チップブレーカ凹部の底面部から前記チップブレーカ溝側の周縁部までが、当該底面部から立ち上がる壁面で形成され、当該壁面の前記上下面と平行な平面に対する立ち上がり角度η1は、前記ブレーカ突起の壁面の前記上下面と平行な平面に対する立ち上がり角度η2よりも小さいことを特徴とする請求項1~3のいずれかに記載の切削インサート。
- 前記ノーズ部チップブレーカ凹部は、前記ノーズ部により画定される頂角の2等分線に関して対称に形成されることを特徴とする請求項1~4のいずれかに記載の切削インサート。
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CA2797022A CA2797022A1 (en) | 2010-05-11 | 2011-05-06 | Cutting insert |
EP11780554.9A EP2570211B1 (en) | 2010-05-11 | 2011-05-06 | Cutting insert |
JP2012514776A JP5206905B2 (ja) | 2010-05-11 | 2011-05-06 | 切削インサート |
RU2012147794/02A RU2532612C2 (ru) | 2010-05-11 | 2011-05-06 | Режущая пластина |
BR112012027776-6A BR112012027776B1 (pt) | 2010-05-11 | 2011-05-06 | Inserto de corte |
US13/667,941 US8876441B2 (en) | 2010-05-11 | 2012-11-02 | Cutting insert having chip breaker |
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US13/667,941 Continuation-In-Part US8876441B2 (en) | 2010-05-11 | 2012-11-02 | Cutting insert having chip breaker |
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US (1) | US8876441B2 (ja) |
EP (1) | EP2570211B1 (ja) |
JP (1) | JP5206905B2 (ja) |
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JP6648392B1 (ja) * | 2018-09-06 | 2020-02-14 | 住友電工ハードメタル株式会社 | 切削インサート |
JP7505634B1 (ja) | 2023-12-28 | 2024-06-25 | 株式会社タンガロイ | 切削インサート、及び当該切削インサートを備えた切削工具 |
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CN105517737A (zh) * | 2013-09-09 | 2016-04-20 | 住友电工硬质合金株式会社 | 切削刀具 |
CN105517737B (zh) * | 2013-09-09 | 2017-03-29 | 住友电工硬质合金株式会社 | 切削刀具 |
US10118228B2 (en) | 2013-09-09 | 2018-11-06 | Sumitomo Electric Hardmetal Corp. | Cutting insert |
JPWO2016035490A1 (ja) * | 2014-09-05 | 2017-06-22 | 住友電工ハードメタル株式会社 | スローアウェイチップ |
JP2019005888A (ja) * | 2017-06-23 | 2019-01-17 | 株式会社タンガロイ | 切削工具 |
JP6648392B1 (ja) * | 2018-09-06 | 2020-02-14 | 住友電工ハードメタル株式会社 | 切削インサート |
WO2020049678A1 (ja) * | 2018-09-06 | 2020-03-12 | 住友電工ハードメタル株式会社 | 切削インサート |
US11400521B2 (en) | 2018-09-06 | 2022-08-02 | Sumitomo Electric Hardmetal Corp. | Cutting insert |
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Publication number | Publication date |
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BR112012027776A2 (pt) | 2016-08-02 |
KR20120134151A (ko) | 2012-12-11 |
CN102905824B (zh) | 2015-01-28 |
CN102905824A (zh) | 2013-01-30 |
RU2532612C2 (ru) | 2014-11-10 |
EP2570211A4 (en) | 2014-07-23 |
JP5206905B2 (ja) | 2013-06-12 |
EP2570211B1 (en) | 2020-07-15 |
CA2797022A1 (en) | 2011-11-17 |
US20130094914A1 (en) | 2013-04-18 |
RU2012147794A (ru) | 2014-06-20 |
US8876441B2 (en) | 2014-11-04 |
JPWO2011142297A1 (ja) | 2013-07-22 |
BR112012027776B1 (pt) | 2020-06-23 |
EP2570211A1 (en) | 2013-03-20 |
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