Cutting insert, cutting tool, and method for manufacturing machined product

Abstract

To solve the problem that it is desired to supply a coolant to a cutting blade efficiently.SOLUTION: A cutting insert according to one embodiment of the present disclosure comprises a cutting part that is provided with a first surface having a rising surface region, a second surface positioned at an opposite side of the first surface, a third surface, positioned between the first surface and the second surface, which has a flank face region, a chamfer face, positioned between the first surface and the third surface, which inclines with respect to the first surface and the third surface, and a flow path having an opening part opening on the chamfer face.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present aspect relates to a method for manufacturing a cutting insert, a cutting tool, and a machined product. [Background technology]

[0002] Known cutting inserts for cutting tools used when cutting a workpiece include, for example, the cutting insert described in Patent Document 1. The cutting inserts described in Patent Documents 1 and 2 have a flow path therein through which a coolant flows to cool the cutting insert. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 074979 [Patent Document 2] JP 2019-77002 A [Patent Document 3] JP 2014-18891 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the cutting inserts described in Patent Documents 1 to 3, the flow passages are open on the rake face. Therefore, there is a risk that the cooling effect of the cutting edge may be insufficient. On the other hand, there is a demand for further improvement in the cooling effect of the cutting edge. [Means for solving the problem]

[0005] A cutting insert according to one embodiment of the present disclosure has a cutting portion including a first surface having a raised surface region, a second surface located opposite to the first surface, a third surface located between the first surface and the second surface and having a flank surface region, a chamfer surface located between the first surface and the third surface and inclined with respect to the first surface and the third surface, and a flow path having an opening that opens in the chamfer surface. The first surface has a corner and a first side extending from the corner, the chamfer surface has a first chamfer surface located along the corner and a second chamfer surface located along the first side, the opening is located on the second chamfer surface, the second chamfer surface has a first region and a second region that is farther from the first chamfer surface than the first region, in a cross section that is parallel to the first surface and intersects with the second chamfer surface, the first region has a linear shape and the second region has a concave shape, and the opening is located in the second region. do. [Effects of the Invention]

[0006] The cutting insert of the above aspect can efficiently supply coolant to the cutting edge. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view showing a cutting insert according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a plan view of the cutting insert shown in FIG. 1 as viewed from the A1 direction. [Figure 3] 2 is a plan view of the cutting insert shown in FIG. 1 as viewed from the A2 direction. [Figure 4] FIG. 2 is an enlarged view of an area B1 shown in FIG. [Figure 5] FIG. 3 is an enlarged view of an area B2 shown in FIG. [Figure 6] FIG. 4 is an enlarged view of the cross section VI-VI shown in FIG. [Figure 7] FIG. 7 is an enlarged view of a cross section VII-VII shown in FIG. [Figure 8] FIG. 1 is a plan view illustrating a cutting tool according to an embodiment of the present disclosure. [Figure 9] 1 is a diagram illustrating a step in a method for manufacturing a machined product according to an embodiment of the present disclosure. [Figure 10] 1 is a diagram illustrating a step in a method for manufacturing a machined product according to an embodiment of the present disclosure. [Figure 11] 1 is a diagram illustrating a step in a method for manufacturing a machined product according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0008] <Cutting insert> Hereinafter, cutting inserts (hereinafter referred to as "inserts") according to embodiments of the present disclosure will be described in detail with reference to the drawings. However, for the sake of convenience, the drawings referred to below show only the main components necessary for explaining the inserts according to the respective embodiments in a simplified form. Therefore, the inserts according to the present disclosure may include any components not shown in the respective drawings. Furthermore, the dimensions of the components in the respective drawings do not faithfully represent the actual dimensions of the components, the dimensional ratios of the components, etc.

[0009] As shown in Figure 1, the insert 1 of this embodiment has a first surface 3 (upper surface), a second surface 5 (lower surface) located opposite the first surface 3, and a third surface 7 (side surface) located between the first surface 3 and the second surface 5.

[0010] The first surface 3 and the second surface 5 are polygonal, each having a plurality of corners and a plurality of sides. The plurality of corners on the first surface 3 are referred to as corners 9, and the plurality of sides on the first surface 3 are referred to as sides 11. In the example shown in FIG. 2, the first surface 3 and the second surface 5 are rhombic. Therefore, the first surface 3 in the example shown in FIG. 2 has four corners 9 and four sides 11. Furthermore, in the example insert 1 shown in FIG. 2, the third surface 7 has four flat portions, each of which is approximately rectangular.

[0011] As described above, the first surface 3 has multiple corners 9 and multiple sides 11. Here, one of the multiple corners 9 is referred to as the first corner 9A, another of the multiple corners 9 is referred to as the second corner 9B, and another of the multiple corners 9 is referred to as the third corner 9C. This can be rephrased as saying that the first surface 3 has the first corner 9A, the second corner 9B, and the third corner 9C. The second corner 9B and the third corner 9C are each located adjacent to the first corner 9A among the multiple corners 9. The first surface 3 also has a first side 11A extending from the first corner 9A to the second corner 9B, and a second side 11B extending from the first corner 9A to the third corner 9C. The first side 11A and the second side 11B can be said to be part of the multiple sides of the first surface 3.

[0012] Here, FIG. 2 is a plan view of the cutting insert 1 shown in FIG. 1 as seen from the A1 direction, and is a front view of the first surface 3. Hereinafter, the front view of the first surface 3 may be referred to as a top view. In FIG. 2, the second corner 9B is located on the right side of the insert 1, and the third corner 9C is located on the left side of the insert 1, but this may be reversed. Also, FIG. 3 is a plan view of the cutting insert 1 shown in FIG. 1 as seen from the A2 direction, and is a front view of a flat portion of the third surface 7 located along the first side 11A. Hereinafter, the front view of the third surface 7 may be referred to as a side view.

[0013] 2, when the insert 1 is viewed from above, each corner 9 has a curved shape, and the radius of curvature of each corner 9 may be constant, for example. In the example shown in FIG. 2, when the insert 1 is viewed from above, each side 11 has a straight line shape.

[0014] Although the size of the insert 1 is not particularly limited, for example, in the insert 1 according to this embodiment, the length of the first side 11A is set to 3 to 20 mm, and the height from the first surface 3 to the second surface 5 is set to 2 to 20 mm.

[0015] In the example shown in Fig. 1, the insert 1 has a chamfered surface 13 located between the first surface 3 and the third surface 7 and inclined relative to the first surface 3 and the third surface 7. Here, the chamfered surface 13 is a strip-shaped surface area provided along the cutting edge 15 to suppress chipping of the cutting edge.

[0016] In the insert 1 according to this embodiment, the chamfered surface 13 is inclined away from the central axis O of the insert 1 from the first surface 3 toward the second surface 5. Here, the central axis O of the insert 1 refers to an axis passing through the center of the first surface 3 and the center of the second surface 5, as shown in FIG. 1 . There is no particular limitation on the method for forming the chamfered surface 13. For example, the chamfered surface 13 may be formed on the insert 1 by chamfering.

[0017] The insert 1 has a cutting edge 15 located at the intersection of the chamfered surface 13 and the third surface 7. Specifically, as shown in the insert 1 according to this embodiment, in a portion of the insert 1 having the chamfered surface 13, the cutting edge 15 may be located at the intersection of the chamfered surface 13 and the third surface 7, but is not limited thereto. For example, in a portion of the insert 1 not having the chamfered surface 13, the cutting edge 15 may be located at the intersection of the first surface 3 and the third surface 7.

[0018] In the example shown in Figure 2, the cutting edge 15 has a first cutting edge 15A located along a portion of the first side 11A, a second cutting edge 15B located along a portion of the second side 11B, and a first corner cutting edge 15C located along the entire first corner 9A.

[0019] In the example shown in Figures 4 and 5, the first cutting edge 15A and the second cutting edge 15B have a linear shape. The first corner cutting edge 15C has a convex curved shape. The radius of curvature of the first corner cutting edge 15C when viewed from above may be constant. In the example shown in Figure 4, the insert 1 has a cutting edge 15 at the intersection of the chamfered surface 13 and the third surface 7, so the first surface 3 has a raised surface region 17, and the third surface 7 has a flank surface region 19. The first surface 3 may have a region that functions as a rake face between the chamfered surface 13 and the raised surface region 17.

[0020] 1, the insert 1 has through holes 21 that open to the first surface 3 and the second surface 5. The through holes 21 are used as holes into which a fastener is inserted when the insert 1 is attached to a holder. Examples of fasteners include screws, clamp members, and wedges.

[0021] Furthermore, through-hole 21 is not limited to the above configuration, and may, for example, open to third surface 7. In this case, through-hole 21 may penetrate from one of the multiple flat surface portions of third surface 7 to another flat surface portion located on the opposite side.

[0022] The insert 1 according to this embodiment has a flow path 23 for supplying coolant to the cutting edge 15 during cutting. The flow path 23 is provided inside the insert 1. There are no particular limitations on the method for forming the flow path 23. For example, the flow path 23 may be formed in the insert 1 by drilling, laser processing, manufacturing using a 3D printer, or the like.

[0023] 4 and 5, the flow path 23 has an opening 25 that opens at the chamfer surface 13. The opening 25 is configured to discharge the coolant that has flowed from the flow path 23. In the example shown in FIG. 4, the opening 25 has an elliptical shape when viewed from above. Note that the shape of the opening 25 is not limited to the above case and may be, for example, a circle, a horizontally elongated ellipse, or a substantially triangular shape.

[0024] As described in Patent Documents 1 to 3, when the flow path opens on the rake face and this opening is far away from the cutting edge, there is a risk that the coolant cannot be efficiently supplied to the cutting edge. This is because the coolant discharged from the opening is generated by the cutting process. This is because there is a risk that the coolant may not be supplied sufficiently to the cutting edge due to collision with the generated chips, etc.

[0025] On the other hand, in the insert 1 according to this embodiment, the opening 25 of the flow path 23 is located on the chamfered surface 13. Since the opening 25 is located on the chamfered surface 13 that is located along the cutting edge 15, the distance between the cutting edge 15 and the opening 25 is short. This can prevent the occurrence of a problem in which chips are generated that make it difficult for the coolant to reach the desired location.

[0026] The insert 1 according to this embodiment has a first chamfer surface 13A located along the first corner 9A and a second chamfer surface 13B located along the first side 11A. Since the first chamfer surface 13A and the second chamfer surface 13B are both minute surface areas, from a macroscopic point of view, they may be evaluated as having a curved shape and a linear shape, respectively. In the insert 1 according to this embodiment, the curved shape of the first chamfer surface 13A has a constant radius of curvature.

[0027] In the insert 1 according to this embodiment, the first chamfer surface 13A is connected to the second chamfer surface 13B. In the example shown in FIG. 4 , the first edge 11A has a first portion 27 and a second portion 29. The first portion 27 is located at the intersection of the second chamfer surface 13B and the first surface 3. The second portion 29 is located at the intersection of the first surface 3 and the third surface 7. The second portion 29 is located farther from the first corner 9A than the first portion 27 and is connected to the first portion 27. In the example shown in FIG. 4 , the boundary between the first portion 27 and the second portion 29 is surrounded by the first surface 3, the third surface 7, and the chamfer surface 13.

[0028] In the insert 1 according to this embodiment, the opening 25 is located on the second chamfer surface 13B. In this case, coolant can be more efficiently supplied to the entire cutting edge 15. In the example shown in FIG. 4, the entire opening 25 is located on the second chamfer surface 13B, but this is not limiting, and at least a portion of the opening 25 may be located on the second chamfer surface 13B.

[0029] Here, the position of the opening 25 is not limited to the above case. For example, although not shown, the opening 25 may be located on the first chamfer surface 13A. Generally, during cutting, the corner 9 is likely to be subjected to large cutting loads, and in such a case, coolant can be supplied more efficiently to the portion of the cutting edge 15 that is likely to be subjected to cutting loads. The entire opening 25 may be located on the first chamfer surface 13A, or at least a portion of the opening 25 may be located on the first chamfer surface 13A.

[0030] In the insert 1 according to this embodiment, the second chamfer surface 13B has a first region 31 and a second region 33 located farther from the first chamfer surface 13A than the first region 31. In the example shown in FIG. 4, the second region 33 is connected to the first region 31.

[0031] 5, when viewed from above, the width of the first region 31 in the direction perpendicular to the first side 11A is constant. The width of the second region 33 in the direction perpendicular to the first side 11A decreases with increasing distance from the first region 31. In this way, the ranges of the first region 31 and the second region 33 may be identified by evaluating the width of the second chamfer surface 13B in the direction perpendicular to the first side 11A.

[0032] In addition, in a cross section parallel to the first surface 3 and intersecting with the second chamfer surface 13B, The first region 31 has a linear shape, and the second region 33 has a concave shape. In this case, the coolant is discharged toward the workpiece, and the coolant that hits the workpiece tends to bounce back toward the cutting edge 15, so the coolant can be supplied to the cutting edge 15 more efficiently.

[0033] 6, the first region 31 has a linear shape, and the second region 33 has a concave curved shape that is connected to the first region 31 and extends in a direction away from the central axis of the insert 1 as it moves away from the first chamfer surface 13A. The concave curved shape here may have a constant radius of curvature.

[0034] 6 is an enlarged view of a region corresponding to FIG. 5 in a VI-VI cross section of the insert 1 taken along the line VI-VI in FIG. 3. The VI-VI cross section is parallel to the first surface 3 and intersects with the second chamfer surface 13B.

[0035] In addition, in a cross section perpendicular to the first surface 3, parallel to the direction in which the second chamfered surface 13B extends, and intersects with the second chamfered surface 13B, the first region 31 has a linear shape, and the second region 33 has a concave shape. In this case, the coolant is more likely to be discharged in a direction parallel to the first surface 3, and the coolant can be supplied to the cutting edge 15 more efficiently.

[0036] 7, the first region 31 has a linear shape, and the second region 33 has a concave curved shape that is connected to the first region 31 and extends toward the first surface 3 as it moves away from the first chamfer surface 13A. The concave curved shape referred to here may have a constant radius of curvature.

[0037] 7 is an enlarged view of the vicinity of the second region 33 in a VII-VII cross section obtained by cutting the insert 1 along the VII-VII line shown in Fig. 5. The VII-VII cross section is perpendicular to the first surface 3, parallel to the direction in which the second chamfer surface 13B extends, and intersects with the second chamfer surface 13B.

[0038] 6 and 7, the second region 33 has a curved surface region. In the insert 1 according to this embodiment, the entire second region 33 has a curved surface shape.

[0039] In the insert 1 according to this embodiment, the opening 25 is located in the second region 33. In this case, coolant can be more efficiently supplied to the entire cutting edge 15. In the example shown in FIG. 4, the entire opening 25 is located in the second region 33, but this is not limiting, and at least a portion of the opening 25 may be located in the second region 33.

[0040] Furthermore, when the opening 25 is located in the second region 33 and the second region 33 has a curved shape, the coolant ejected from the opening 25 tends to flow along the entire chamfer surface 13, and as a result, the coolant can be supplied more efficiently to the entire cutting edge 15.

[0041] In the insert 1 according to this embodiment, the flow path 23 has a linear first flow path 35 extending from the opening 25. In the insert 1 according to this embodiment, the first flow path 35, when viewed from the top, becomes farther from the first side 11A as it moves away from the first corner 9A. In this case, coolant can be supplied to the cutting edge 15 more efficiently. In the insert 1 according to this embodiment, the first flow path 35 is parallel to the first surface 3 when viewed from the side.

[0042] In the insert 1 according to this embodiment, the flow path 23 is inclined with respect to the first flow path 35 and has a second flow path 37 extending from the first flow path 35 toward the second surface 5. Here, the second flow path 37 does not need to extend perpendicular to the second surface 5 as in the insert 1 according to this embodiment, and may have, for example, a linear shape inclined with respect to the second surface 5 or a curved shape. For convenience of explanation, the first flow path 35 and the second flow path 37 are located inside the insert 1, and therefore the first flow path 35 and the second flow path 37 are shown by dotted lines in FIGS. 1 to 6.

[0043] In the insert 1 according to this embodiment, the first flow passage 35 approaches the first corner 9A as it moves away from the second flow passage 37. In this case, the coolant can be discharged from the opening 25 toward the first corner 9A, so that the coolant can be supplied to the cutting edge 15 more efficiently.

[0044] In the insert 1 according to this embodiment, the central axis N of the first flow passage 35 intersects with the cutting edge 15 when viewed from above. Specifically, as shown in Fig. 5, the central axis N of the first flow passage 35 intersects with the first cutting edge 15A. In this case, the coolant can be supplied to the cutting edge 15 more efficiently.

[0045] Although the above only mentions the case where the opening 25 is located on the first side 11A side, the opening 25 may also be located on the second side 11B side, as shown in the insert 1 of this embodiment.

[0046] Examples of materials for the insert 1 include cemented carbide, cermet, ceramics, cBN (Cubic Boron Nitride), and PCD (Polycrystalline Diamond).

[0047] Examples of cemented carbide compositions include WC (tungsten carbide)-Co, WC-TiC (titanium carbide)-Co, and WC-TiC-TaC (tantalum carbide)-Co. Here, WC, TiC, and TaC are hard particles, and Co is a binder phase. Cermets are sintered composite materials in which a ceramic component is combined with a metal. Specific examples of cermets include compounds whose main component is TiC or TiN (titanium nitride). However, the material of the insert 1 is not limited to these.

[0048] The insert 1 may be made up of only one member made of the material exemplified above, or may be made up of multiple members made of the material exemplified above.

[0049] As shown in FIG. 1, the insert 1 according to this embodiment is made up of a base portion 41 and a cutting portion 43, and has a polygonal plate shape as a whole. The base portion 41 has a roughly polygonal plate shape with some of the corners cut out. The cutting portion 43 is joined to this cut out portion using a brazing material or the like. Note that if the insert 1 is made up of only one member, the entire insert 1 may be the cutting portion 43.

[0050] 3 and 5, the cutting portion 43 has a part of the first surface 3, a part of the third surface 7, the first corner 9A, a part of the first side 11A, a part of the second side 11B, the chamfered surface 13, the cutting edge 15, the opening 25, and a part of the first flow path 35. The base 41 has the remaining part of the first flow path 35 and the second flow path 37.

[0051] As described above, in the insert 1 according to this embodiment, the first flow passage 35 is located from the cutting portion 43 to the base portion 41, and the second flow passage 37 is located only in the base portion 41. The flow path 23 may have such a configuration.

[0052] The second flow passage 37 is inclined with respect to the first flow passage 35. Therefore, the flow passage 23 is bent at the boundary between the first flow passage 35 and the first flow passage 37. This bent portion is located in the base portion 41. The bent portion of the flow passage 23 can be a cause of reduced durability, but because the bent portion of the flow passage 23 is located in the base portion 41 rather than in the cutting portion 43 where a relatively high cutting load is applied, a decrease in durability of the insert 1 is likely to be avoided.

[0053] When the cutting portion 43 is made of a material (hard material) having a relatively high hardness, such as cBN or PCD, and the base portion 41 is made of a material such as cemented carbide, cermet, or ceramics, the insert 1 can be manufactured inexpensively and has high durability against cutting loads. The hardness of the base portion 41 and the cutting portion 43 can be evaluated by measuring the Vickers hardness of each portion.

[0054] In this embodiment, the cutting portion 43 is made of a hard material (cBN and PCD), which means that the main component of the material of the cutting portion 43 is cBN or PCD. That is, the cutting portion 43 may contain a small amount (about 10% by mass or less) of additives or impurities in addition to the hard material. Similarly, the base 41 in this embodiment is made of a cemented carbide alloy, which means that the main component of the material of the base 41 is the cemented carbide alloy. That is, the base 41 may contain a small amount (about 10% by mass or less) of additives or impurities in addition to the cemented carbide alloy.

[0055] When the cutting portion 43 is made of a material with a relatively high hardness, such as cBN or PCD, as in the insert 1 according to this embodiment, it is difficult to perform fine machining on the shape of the rake face of the cutting portion 43, making it difficult to ensure efficient coolant supply. However, the insert 1 according to this embodiment has the opening 25 on the chamfer surface 13, which allows coolant to be supplied to the cutting edge 15 more efficiently without being restricted by the shape of the insert 1. Therefore, when the cutting portion 43 is made of the above-mentioned material, the advantage of providing the opening 25 on the chamfer surface 13 is more effectively utilized.

[0056] The insert 1 may be configured only by the base portion 41 and the cutting portion 43, but as an example of a configuration other than the above, the insert 1 may be provided with a coating layer (not shown) that covers the surface of the insert 1. The coating layer may cover the entire surface of the insert 1, or may cover only a portion of the surface of the insert 1.

[0057] Examples of materials for the coating layer include aluminum oxide (alumina), and titanium carbides, nitrides, oxides, carbonates, oxynitrides, carbonitrides, and oxycarbonitrides. The coating layer may contain only one of the above materials, or may contain a plurality of them.

[0058] The coating layer may be composed of only one layer, or may be composed of a plurality of layers stacked together. However, the material of the coating layer is not limited to these. The coating layer can be disposed on the substrate by, for example, chemical vapor deposition (CVD) or physical vapor deposition (PVD).

[0059] <Cutting tools> Next, a cutting tool 101 according to an embodiment will be described with reference to the drawings.

[0060] As shown in FIG. 8, the cutting tool 101 of this embodiment includes a holder 105 having a pocket 103 on the tip side, and the insert 1 according to this embodiment located in the pocket 103. In the cutting tool 101 of this embodiment, the insert 1 is attached so that at least a part of the cutting edge 15 protrudes from the tip of the holder 105.

[0061] The holder 105 has a long, thin rod shape. A pocket 103 is provided on the tip side of the holder 105. The pocket 103 is a portion where the insert 1 is attached, and is open to the tip surface of the holder 105. At this time, the pocket 103 is also open to the side surface of the holder 105, which makes it easy to attach the insert 1. Specifically, the pocket 103 has a seating surface parallel to the bottom surface of the holder 105 and a restraining side surface inclined relative to the seating surface.

[0062] The insert 1 is positioned in the pocket 103. At this time, the lower surface of the insert 1 may be in direct contact with the pocket 103, or a sheet may be sandwiched between the insert 1 and the pocket 103.

[0063] The insert 1 is attached so that the cutting edge 15 protrudes outward from the holder 105. In this embodiment, the insert 1 is attached to the holder 105 by a clamp member 107, which is an example of a fixing portion. That is, the head of the clamp member 107 is pressed against the inner wall of the through hole of the insert 1, thereby restraining the insert 1 in the pocket 103.

[0064] Steel, cast iron, etc. can be used for the holder 105. Of these materials, it is particularly preferable to use steel, which has high toughness.

[0065] In this embodiment, a cutting tool used for so-called turning is exemplified. Examples of turning include internal diameter machining, external diameter machining, and grooving. The cutting tool is not limited to that used for turning. For example, the insert 1 according to the above embodiment may be used in a cutting tool used for milling.

[0066] <Method of manufacturing machined products> Next, a method for manufacturing a machined product according to one embodiment of the present invention will be described with reference to the drawings.

[0067] The machined product is produced by cutting a workpiece 201. The manufacturing method of the machined product in this embodiment includes the following steps: (a) rotating the workpiece 201; (b) bringing a ridgeline of a cutting tool 101, such as that typified by the above-described embodiment, into contact with a rotating workpiece 201; (c) separating the cutting tool 101 from the workpiece 201; It is equipped with:

[0068] More specifically, first, as shown in Fig. 9, the workpiece 201 is rotated around the axis Z, and the cutting tool 101 is brought relatively close to the workpiece 201. Next, as shown in Fig. 10, the cutting edge of the cutting tool 101 is brought into contact with the workpiece 201 to cut the workpiece 201. Then, as shown in Fig. 11, the cutting tool 101 is moved relatively away from the workpiece 201.

[0069] In this embodiment, the cutting tool 101 is moved in the Y1 direction while the workpiece 201 is being rotated with the axis Z fixed, thereby approaching the workpiece 201. In addition, in FIG. 10, the cutting blade 15 is brought into contact with the rotating workpiece 201 and moved in the Y2 direction to cut the workpiece 201. In addition, in FIG. 11, the cutting tool 101 is moved away from the rotating workpiece 201 by moving in the Y3 direction.

[0070] In the cutting process in the manufacturing method of this embodiment, By moving the tool 101, the cutting tool 101 is brought into contact with the workpiece 201 or moved away from the workpiece 201, but of course, the present invention is not limited to this form.

[0071] For example, in step (a), the workpiece 201 may be brought closer to the cutting tool 101. Similarly, in step (c), the workpiece 201 may be moved away from the cutting tool 101. To continue the cutting process, the workpiece 201 may be kept rotating, and the step of bringing the cutting edge 15 of the insert 1 into contact with different locations on the workpiece 201 may be repeated.

[0072] Typical examples of the material of the workpiece 201 include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0073] In one embodiment, (1) the cutting insert may have a cutting portion including a first surface having a raised surface region, a second surface located opposite the first surface, a third surface located between the first surface and the second surface and having a clearance surface region, a chamfer surface located between the first surface and the third surface and inclined relative to the first surface and the third surface, and a flow path having an opening that opens in the chamfer surface.

[0074] (2) In the cutting insert of (1) above, the first surface may have a corner and a first side extending from the corner, the chamfer surface may have a first chamfer surface located along the corner and a second chamfer surface located along the first side, and the opening may be located on the second chamfer surface.

[0075] (3) In the cutting insert of (2) above, the second chamfer surface may have a first region and a second region that is farther from the first chamfer surface than the first region, and in a cross section parallel to the first surface and intersecting with the second chamfer surface, the first region may be linear and the second region may be concave, and the opening may be located in the second region.

[0076] (4) In the cutting insert of (2) or (3) above, the second chamfer surface may have a first region and a second region that is farther from the first chamfer surface than the first region, and may be perpendicular to the first surface and parallel to the direction in which the second chamfer surface extends. In a cross section intersecting with the second chamfer surface, the first region may be linear and the second region may be concave, and the opening may be located in the second region.

[0077] (5) In any of the cutting inserts (1) to (4) above, the flow path may have a first flow path having a linear shape extending from the opening and a second flow path extending from the first flow path toward the second surface, and the first flow path may approach the corner as it moves away from the second flow path.

[0078] (6) In any of the cutting inserts (1) to (5) above, the cutting insert may further have a base to which the cutting portion is bonded, the base being made of cemented carbide, and the cutting portion being made of cubic boron nitride or polycrystalline diamond.

[0079] (7) A cutting tool may include a holder having a pocket located on the tip side, and a cutting insert according to any one of (1) to (6) above located in the pocket.

[0080] (8) The method may include the steps of rotating a workpiece, bringing the cutting tool described in (7) above into contact with the rotating workpiece, and moving the cutting tool away from the workpiece.

[0081] The invention according to the present disclosure has been described above based on the drawings and embodiments. However, the invention according to the present disclosure is not limited to the above-described embodiments. In other words, the invention according to the present disclosure can be modified in various ways within the scope of the present disclosure, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the invention according to the present disclosure. In other words, it should be noted that a person skilled in the art can easily make various modifications or corrections based on the present disclosure. It should also be noted that these modifications or corrections are included in the scope of the present disclosure. [Explanation of symbols]

[0082] 1. Cutting insert (insert) 3...1st side (top side) 5...2nd side (bottom side) 7...Third side (side) 9 Corner 9A First corner 9B 2nd corner 9C··Third corner 11 sides 11A··First side 11B Second side 13. Chamfer surface 13A First chamfer surface 13B Second chamfer surface 15···Cutting edge 15A 1st cutting edge 15B 2nd cutting edge 15C··First corner cutting edge 17. Rising surface area 19. Flank area 21...Through hole 23 Flow path 25...Opening 27...Part 1 29...Second part 31...1st area 33...Second area 35...First flow path 37 Second flow path 41...Base 43...Cutting part 101...Cutting tools 103···Pocket 105···Holder 107 Clamping member 201...Work material O Center axis of insert N: Central axis of first flow path Z: Rotation axis of the workpiece Y1~Y3...Movement direction

Claims

1. a first surface having a raised surface region; a second surface located opposite the first surface; a third surface located between the first surface and the second surface, the third surface having a clearance area; a chamfer surface located between the first surface and the third surface and inclined relative to the first surface and the third surface; a cutting portion including a flow path having an opening that opens at the chamfer surface, The first surface is Corner and a first side extending from the corner; The chamfer surface is a first chamfer surface located along the corner; a second chamfer surface located along the first side, the opening is located on the second chamfer surface, The second chamfer surface is A first region; a second region that is farther from the first chamfer surface than the first region, In a cross section parallel to the first surface and intersecting with the second chamfer surface, the first region has a linear shape and the second region has a concave shape, The opening is located in the second region of the cutting insert.

2. 2. The cutting insert according to claim 1, wherein in a cross section perpendicular to the first surface, parallel to an extension direction of the second chamfer surface, and intersecting with the second chamfer surface, the first region has a linear shape and the second region has a concave shape.

3. The flow path is a first flow path having a linear shape extending from the opening; a second flow path extending from the first flow path toward the second surface, The cutting insert according to claim 1 , wherein the first flow passage approaches the corner as it moves away from the second flow passage.

4. a first surface having a raised surface region; a second surface located opposite the first surface; a third surface located between the first surface and the second surface, the third surface having a clearance area; a chamfer surface located between the first surface and the third surface and inclined relative to the first surface and the third surface; a cutting portion including a flow path having an opening that opens at the chamfer surface, The first surface is Corner and a first side extending from the corner; The chamfer surface is a first chamfer surface located along the corner; a second chamfer surface located along the first side, the opening is located on the second chamfer surface, The second chamfer surface is A first region; a second region that is farther from the first chamfer surface than the first region, In a cross section perpendicular to the first surface, parallel to a direction in which the second chamfer surface extends, and intersecting with the second chamfer surface, the first region has a linear shape and the second region has a concave shape, The opening is located in the second region of the cutting insert.

5. The flow path is a first flow path having a linear shape extending from the opening; a second flow path extending from the first flow path toward the second surface, The cutting insert according to claim 4 , wherein the first flow passage approaches the corner as it moves away from the second flow passage.

6. a first surface having a raised surface region; a second surface located opposite the first surface; a third surface located between the first surface and the second surface, the third surface having a clearance area; a chamfer surface located between the first surface and the third surface and inclined relative to the first surface and the third surface; a cutting portion including a flow path having an opening that opens at the chamfer surface, The first surface is Corner and a first side extending from the corner; The chamfer surface is a first chamfer surface located along the corner; a second chamfer surface located along the first side, the opening is located on the second chamfer surface, The flow path is a first flow path having a linear shape extending from the opening; a second flow path extending from the first flow path toward the second surface, The cutting insert, wherein the first flow passage approaches the corner as it moves away from the second flow passage.

7. a holder having a pocket located on the tip side; and the cutting insert according to any one of claims 1 to 6, located in the pocket.

8. rotating the workpiece; bringing the cutting tool according to claim 7 into contact with the rotating workpiece; and removing the cutting tool from the workpiece.

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