Methods for manufacturing cutting inserts, cutting tools, and workpieces

Abstract

The cutting insert, in one undefined aspect, is a quadrangular prism shape extending along a central axis from a front end to a rear end, and has a cutting portion and a body portion. The body portion has: an upper surface having a first V-shaped groove extending along the central axis; and a lower surface having a second V-shaped groove extending along the central axis. The first groove has: a first region located on the rear end side; and a second region located on the front end side of the first region. The opening angle of the first groove in the first region is smaller than the opening angle of the first groove in the second region. The opening angle of the second groove is constant in the direction along the central axis.

Description

Technical Field

[0001] This disclosure relates to cutting inserts (hereinafter also simply referred to as "inserts") used in the cutting of workpieces. Examples of cutting processes include grooving and parting. Background Technology

[0002] As an insert used for cutting a workpiece, an example is the insert described in Patent Document 1. The insert described in Patent Document 1 has an upper surface and a lower surface each having a V-shaped groove extending along an axis. The insert is fixed to the tool holder by abutting the V-shaped grooves on the upper and lower surfaces of the insert against the upper and lower jaws of the tool holder. Furthermore, the insert can be mounted and removed from the tool holder by sliding it relative to the tool holder along the axis.

[0003] Prior art literature

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2007-069290 Summary of the Invention

[0006] The cutting insert (blade) of this disclosure, in one undefined aspect, is a quadrangular prism shape extending along a central axis from a front end toward a rear end, and has: a cutting portion located on the front end side and having a cutting edge located at the front end; and a body portion located on the rear end side beyond the cutting portion. The body portion has: an upper surface having a first V-shaped groove extending along the central axis; and a lower surface located on the opposite side of the upper surface and having a second V-shaped groove extending along the central axis. The first groove has: a first region located on the rear end side; and a second region located on the front end side beyond the first region. The opening angle of the first groove in the first region is smaller than the opening angle of the first groove in the second region. The opening angle of the second groove is constant in the direction along the central axis. Attached Figure Description

[0007] Figure 1 This is a perspective view of a blade in an undefined embodiment.

[0008] Figure 2 It is Figure 1 The enlarged view of region A1 shown.

[0009] Figure 3 Viewed from the front side Figure 1 The blade shown is shown in top view.

[0010] Figure 4 Viewed from B1 direction Figure 3 The blade shown is a side view.

[0011] Figure 5 It is Figure 4 The enlarged view of region A2 shown.

[0012] Figure 6 Observed from B2 direction Figure 3 The blade shown is a side view.

[0013] Figure 7 It is Figure 6 The enlarged view of area A3 shown (enlarged view of the cutting part).

[0014] Figure 8 Observed from B3 direction Figure 3 The blade shown is a side view.

[0015] Figure 9 yes Figure 4 The sectional view shown in section IX-IX.

[0016] Figure 10 yes Figure 4 The sectional view of section XX shown.

[0017] Figure 11 yes Figure 4 The sectional view shown in section XI-XI.

[0018] Figure 12 This is a perspective view of a cutting tool in an undefined embodiment.

[0019] Figure 13 It is Figure 12 The area shown in A4 is an enlarged view.

[0020] Figure 14 Viewed from the front side Figure 12 The top view of the cutting tool shown.

[0021] Figure 15 Observed from the B4 direction Figure 14 The side view of the cutting tool shown.

[0022] Figure 16 It is Figure 15 The image shown is an enlarged view of area A5.

[0023] Figure 17 This is a schematic diagram illustrating one step in a method for manufacturing a machined object in an undefined embodiment.

[0024] Figure 18This is a schematic diagram illustrating one step in a method for manufacturing a machined object in an undefined embodiment.

[0025] Figure 19 This is a schematic diagram illustrating one step in a method for manufacturing a machined object in an undefined embodiment. Detailed Implementation

[0026] The blade, which is not limited to any aspect of this disclosure, is described in detail using the accompanying drawings. However, in the figures referred to below, only the main components necessary for illustrating the unlimited embodiments are shown in a simplified manner for ease of explanation. Therefore, the blade can include any constituent components not shown in the referenced figures. Furthermore, the dimensions of the components in the figures are not limited to faithfully representing the actual dimensions of the constituent components or the dimensional ratios of each component.

[0027] like Figure 1 As shown in the undefined example, the insert 1 can be a cylindrical shape extending along the central axis O1 from the front end 1a toward the rear end 1b, and has a main body 3 and a cutting part 5. The main body 3 can be a portion held in the tool holder. The cutting part 5 can have a cutting edge and can also be a portion used in the cutting process for manufacturing the workpiece. The cylindrical insert 1 can be, for example, cylindrical, or it can be a polygonal prism. The polygonal insert 1 can be, for example, a square prism, a pentagonal prism, or a hexagonal prism.

[0028] The blade 1 may have one or more cutting portions 5. For example, such as Figure 1 As shown in the undefined example, the blade 1 may have two cutting portions 5. The cutting portions 5 may be located on the front end 1a side or the rear end 1b side relative to the main body 3.

[0029] As Figure 1 In the undefined example shown, the blade 1 may have a first cutting portion 5a and a second cutting portion 5b. The first cutting portion 5a may be located on the front end 1a side of the blade 1. In other words, the main body 3 may be located on the rear end 1b side of the blade 1, closer to the first cutting portion 5a. The above describes the relative positional relationship between the main body 3 and the first cutting portion 5a. Therefore, a portion of the main body 3 may also be located on the front end 1a side, closer to the central portion of the blade 1.

[0030] The second cutting portion 5b can be located on the rear end 1b side of the blade 1. In other words, the main body 3 can be located on the side closer to the front end 1a of the blade 1 than the second cutting portion 5b. The above describes the relative positional relationship between the main body 3 and the second cutting portion 5b. Therefore, a portion of the main body 3 can also be located on the side closer to the rear end 1b than the central portion of the blade 1. The blade 1 having the first cutting portion 5a and the second cutting portion 5b can generally be referred to as a dog-bone type.

[0031] The first cutting part 5a and the second cutting part 5b can have different structures from each other, or they can have the same structure. For example, as Figure 1 As shown in the undefined example, when the front end 1a and rear end 1b of the blade 1 are reversed, the first cutting portion 5a and the second cutting portion 5b can also have the same structure. Figure 1 In the undefined example shown, the first cutting part 5a and the second cutting part 5b have the same structure, so the description related to the second cutting part 5b will be omitted appropriately in the following description.

[0032] The sizes of the main body 3, the first cutting part 5a, and the second cutting part 5b are not limited to specific values. For example, the length of the main body 3 in the direction along the central axis O1 can be set to 10 to 25 mm. The length of the first cutting part 5a in the direction along the central axis O1 can be set to 2 to 6 mm.

[0033] The main body 3 may have an upper surface 7, a lower surface 9, and a pair of side surfaces 11. The lower surface 9 may be located on the opposite side of the upper surface 7. The width of the upper surface 7 orthogonal to the central axis O1 is the upper width, and the width of the lower surface 9 orthogonal to the central axis O1 is the lower width. The upper and lower widths may be the same value, or the lower width may be smaller than the upper width. The direction orthogonal to the central axis O1 and connecting the upper surface 7 and the lower surface 9 is the vertical direction, and the direction orthogonal to the central axis O1 and the vertical direction and connecting the pair of side surfaces 11 is the horizontal direction.

[0034] A pair of side surfaces 11 can be located between the upper surface 7 and the lower surface 9, respectively. The upper surface 7, the lower surface 9, and the pair of side surfaces 11, when viewed from the front view, can be rectangular shapes extending along the central axis O1. When the upper and lower widths are the same, the spacing between the pair of side surfaces 11 can be constant. When the lower width is smaller than the upper width, the spacing between the pair of side surfaces 11 can also narrow as they approach the lower surface 9.

[0035] The upper surface 7 may have a first groove 13. The first groove 13 may be a V-shape extending along the central axis O1. The first groove 13 being V-shaped means that, in a cross-section orthogonal to the central axis O1, the width of the first groove 13 decreases as it approaches the bottom, in other words, as it approaches the lower surface 9. The bottom of the first groove 13 may refer to the portion of the first groove 13 located closest to the lower surface 9 in a cross-section orthogonal to the central axis O1.

[0036] In a section orthogonal to the central axis O1, if imaginary straight lines are defined to connect the bottom of the first groove 13 to the two opening portions of the first groove 13 respectively, the intersection angle of these imaginary straight lines can also be the opening angle θ1 of the first groove 13. For example, in a section orthogonal to the central axis O1, if the first groove 13 is represented by two straight lines, the intersection angle of these straight lines can be the opening angle θ1 of the first groove 13.

[0037] The first groove 13 can extend to the end of the main body 3 on the front end 1a side, or it can be separated from the end of the main body 3 on the front end 1a side. Similarly, the first groove 13 can extend to the end of the main body 3 on the rear end 1b side, or it can be separated from the end of the main body 3 on the rear end 1b side.

[0038] The lower surface 9 may have a second groove 15. The second groove 15 may be a V-shape extending along the central axis O1. The V-shape of the second groove 15 may mean that, in a cross-section orthogonal to the central axis O1, the width of the second groove 15 decreases as it approaches the bottom, in other words, as it approaches the upper surface 7. The bottom of the second groove 15 may refer to the portion of the second groove 15 located closest to the upper surface 7 in a cross-section orthogonal to the central axis O1.

[0039] In a section orthogonal to the central axis O1, if imaginary straight lines are defined to connect the bottom of the second groove 15 to the two opening portions of the second groove 15 respectively, the intersection angle of these imaginary straight lines can be the opening angle θ2 of the second groove 15. For example, in a section orthogonal to the central axis O1, if the second groove 15 is represented by two straight lines, the intersection angle of these straight lines can be the opening angle θ2 of the second groove 15.

[0040] The second groove 15 can extend to the end of the main body 3 on the front end 1a side, or it can be separated from the end of the main body 3 on the front end 1a side. Similarly, the second groove 15 can extend to the end of the main body 3 on the rear end 1b side, or it can be separated from the end of the main body 3 on the rear end 1b side.

[0041] The first groove 13 and the second groove 15 can be used to improve the positioning accuracy when inserting the blade 1 into the tool holder. Additionally, the first groove 13 and the second groove 15 can be used to improve the restraining force when fixing the blade 1 to the tool holder. For example, the upper jaw of the tool holder may have a protrusion that abuts against the first groove 13, and the lower jaw of the tool holder may have a protrusion that abuts against the second groove 15, thereby achieving the aforementioned improvement in positioning accuracy and restraining force.

[0042] The opening angle θ1 of the first groove 13 can be constant along the direction of the central axis O1, or it can vary along the direction of the central axis O1. That is, when observing different parts of the first groove 13 along the direction of the central axis O1 from sections orthogonal to the central axis O1, the opening angle θ1 of the first groove 13 in each section can be the same or different.

[0043] The first groove 13 may also have a first region 17 and a second region 19. The first region 17 may be located on the rear end 1b side of the first groove 13. The second region 19 may be located on the front end 1a side of the first region 17. The above describes the relative positional relationship between the first region 17 and the second region 19. Therefore, a portion of the second region 19 may be located on the rear end 1b side of the main body 3, compared to the central portion of the main body 3.

[0044] When the first groove 13 has a first region 17 and a second region 19, the opening angle θ1 in these regions can be different from each other. For example, the opening angle θ1 of the first groove 13 in the first region 17 is an opening angle θ11, and the opening angle θ1 of the first groove 13 in the second region 19 is an opening angle θ12. In this case, the opening angle θ11 can be smaller than the opening angle θ12. In this case, it is easy to attach and detach from the tool holder and easy to stably constrain the tool holder for the following reasons.

[0045] The blade 1 is mounted on the shank by inserting it from the front end 1a side toward the rear end 1b side. Here, the first region 17 may be located on the rear end 1b side compared to the second region 19. Therefore, the first region 17 may contact the shank before the second region 19. When the opening angle θ11 of the first groove 13 in the first region 17 is smaller than the opening angle θ12 of the first groove 13 in the second region 19, it is less likely for the blade 1 to shift laterally. This is because the first region 17, with its small opening angle θ11 and steep groove surface, easily becomes an obstacle to lateral shift of the blade 1.

[0046] Furthermore, the following explanation addresses the case where the opening angle θ12 of the first groove 13 in the second region 19 is greater than the opening angle θ2 of the second groove 15 in the first region 17. In this case, when the second region 19 contacts the tool holder and the blade 1 is fixed to the tool holder, the constraint force applied from the upper jaw of the tool holder to the blade 1 is easily transmitted in the vertical direction. This is because, since the opening angle θ12 of the first groove 13 in the second region 19 is greater than the opening angle θ2 of the second groove 15 in the first region 17, the constraint force applied from the upper jaw of the tool holder to the second region 19 is easily and efficiently transmitted in the vertical direction.

[0047] The opening angle θ11 of the first region 17 is not limited to a specific value. For example, the opening angle θ11 of the first region 17 can be set to 130° to 140°. The opening angle θ12 of the second region 19 is not limited to a specific value. For example, the opening angle θ12 of the second region 19 can be set to 140° to 150°.

[0048] The opening angle θ11 of the first region 17 can be constant along the direction of the central axis O1, or it can vary along the direction of the central axis O1. The opening angle θ12 of the second region 19 can be constant along the direction of the central axis O1, or it can vary along the direction of the central axis O1.

[0049] The opening angle θ2 of the second groove 15 can be constant along the direction of the central axis O1, or it can vary along the direction of the central axis O1. That is, when observing different parts of the second groove 15 along the direction of the central axis O1 from sections orthogonal to the central axis O1, the opening angle θ2 of the second groove 15 in each section can be the same or different.

[0050] Compared to the upper surface 7 of the main body 3 and the upper jaw of the tool holder, it is easier to apply a larger cutting load to the lower surface 9 of the main body 3 and the lower jaw of the tool holder. This is because, on the lower surface 9 of the main body 3 and the lower jaw of the tool holder, not only due to the constraint force caused by the main body 3 being clamped by the upper and lower jaws 107, but also the main component force of the cutting load generated during the cutting of the workpiece 201 is easily applied. Here, with the opening angle θ2 of the second groove 15 being constant in the direction along the central axis O1, the deviation of the load on the second groove 15 in the direction along the central axis O1 may become smaller. Therefore, the insert 1 is more easily and stably constrained to the tool holder.

[0051] From the viewpoint of the stability of the constraint of the blade 1 relative to the tool holder, the second groove 15 can also have two flat surfaces that approach each other as they approach the bottom. In this case, the second groove 15 and the tool holder can easily make surface contact. Therefore, the deviation of the load applied to the tool holder from the second groove 15 can be further reduced.

[0052] The opening angle θ2 of the second groove 15 is not limited to a specific value. For example, the opening angle θ2 of the second groove 15 can be set to 140° to 150°. The opening angle θ2 of the second groove 15 can also be the same as the opening angle θ12 of the first groove 13 in the second region 19. In this case, it is easy to smoothly install the blade 1 onto the tool holder. The above-mentioned "same" does not require the two opening angles to be strictly identical. The difference between the two opening angles δθ can be approximately 2° or less.

[0053] The first cutting portion 5a located on one side of the front end 1a of the insert 1 may also have a front end face 21, an upper end face 23, and a cutting edge 25. The front end face 21 may be a face located at the front end 1a of the insert 1. The upper end face 23 may be a face connected to the front end face 21 and extending from the front end face 21 toward the upper surface 7 in the body. The cutting edge 25 may also be located at the intersection of the front end face 21 and the upper end face 23. The front end face 21 can function as a flank face relative to the cutting edge 25. The upper end face 23 can function as a rake face relative to the cutting edge 25.

[0054] In addition to the first region 17 and the second region 19, the first groove 13 may also have a third region 27. The third region 27 may be located on the front end 1a side of the second region 19. In other words, the second region 19 may be located on the rear end 1b side of the third region 27. The above describes the relative positional relationship between the third region 27 and the second region 19. Therefore, a portion of the second region 19 may also be located on the front end 1a side of the central portion of the main body 3.

[0055] When the first groove 13 has a third region 27, the opening angle θ1 of the first groove 13 in the third region 27 is an opening angle θ13. The opening angle θ13 can be smaller than the opening angle θ12 of the first groove 13 in the second region 19. In this case, the blade 1 is easy to load and unload relative to the tool holder for the following reasons, and the blade 1 is easily and stably constrained to the tool holder.

[0056] When the opening angle θ13 of the first groove 13 in the third region 27 is smaller than the opening angle θ12 of the first groove 13 in the second region 19, it is less likely for the blade 1 to shift laterally. This is because the third region 27, with its small opening angle θ13 and steep groove surface, is more likely to become an obstacle to the lateral shift of the blade 1.

[0057] The following description addresses the case where the first groove 13 has a relatively small opening angle θ13 in a first region 17 located on the rear end 1b side of the first groove 13 and a third region 27 located on the front end 1a side of the first groove 13. In this case, it is easy to reduce the lateral positional offset of the blade 1 at both the front end 1a side and the rear end 1b side of the main body. Therefore, the lateral positional offset of the blade 1 can be reduced efficiently.

[0058] Additionally, the following explanations are as follows: Figure 5 As shown in the undefined example, the blade 1 has a first cutting portion 5a and a second cutting portion 5b. In this case, even if the front end 1a and the rear end 1b of the blade 1 are reversed and the blade 1 is mounted on the tool holder, the third region 27 makes it less likely for the blade 1 to shift laterally.

[0059] The opening angle θ13 of the third region 27 is not limited to a specific value. For example, the opening angle θ11 of the first region 17 can be set to 130° to 140°. From the viewpoint of reducing the deviation of the cutting load applied to the first region 17 and the third region 27 when reducing the positional offset of the insert 1 in the lateral direction, the opening angle θ13 of the first groove 13 in the third region 27 can also be the same as the opening angle θ11 of the first groove 13 in the first region 17.

[0060] In addition to the first region 17 and the second region 19, the first groove 13 may also have a fourth region 29. The fourth region 29 may be located between the first region 17 and the second region 19. The opening angle θ1 of the first groove 13 in the fourth region 29 is the opening angle θ14. Here, the opening angles θ11 and θ12 of the first groove 13 in the first region 17 and the second region 19 may be constant. The opening angle θ14 of the first groove 13 in the fourth region 29 may also increase as it approaches the second region 19.

[0061] With the opening angle θ11 of the first groove 13 in the first region 17 constant, the effect of reducing the lateral positional offset of the blade 1 can be stably achieved by utilizing the first region 17. Furthermore, with the opening angle θ12 of the first groove 13 in the second region 19 constant, the position of the blade 1 abutting against the upper jaw of the shank is less affected, and the constraint force applied from the upper jaw of the shank to the second region 19 is easily and efficiently transmitted in the vertical direction. In other words, the dependence on the shape of the shank is less, and the versatility of the cutting blade 1 is high.

[0062] Furthermore, the following explanation addresses the case where the opening angle θ14 of the first groove 13 in the fourth region 29 increases as it approaches the second region 19. In this case, due to the difference in opening angles between the first groove 13 in the first region 17 and the second region 19, the risk of abrupt changes in the opening angle of the first groove 13 from the first region 17 to the second region 19 can be reduced. Therefore, the blade 1 can be smoothly mounted on the tool holder.

[0063] Alternatively, the first groove 13 may have a first region 17, a second region 19, and a fourth region 29, but may not have a third region 27. Alternatively, the first groove 13 may have a first region 17, a second region 19, a third region 27, and a fourth region 29.

[0064] From the viewpoint of reducing the influence of the position of the blade 1 abutting against the upper jaw of the tool holder, the length L2 of the second region 19 can also be longer than the length L1 of the first region 17 in the direction along the central axis O1. For example, the ratio (L2 / L1) of the length L2 of the second region 19 to the length L1 of the first region 17 can be 30 to 40.

[0065] Materials for the cutting tool 1 can include, for example, cemented carbide and cermet. Compositions of cemented carbide can include, for example, WC-Co, WC-TiC-Co, and WC-TiC-TaC-Co. Here, WC, TiC, and TaC can be hard particles, and Co can be a binder phase.

[0066] Alternatively, cermets can also be sintered composite materials obtained by combining ceramic components with metals. As an example of a cermet, titanium compounds with titanium carbide (TiC) or titanium nitride (TiN) as the main components can be cited. However, the material of the blade 1 is not limited to the above-mentioned compositions.

[0067] The surface of the blade 1 can be coated using chemical vapor deposition (CVD) or physical vapor deposition (PVD). Examples of coating materials include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), and aluminum oxide (Al2O3).

[0068] <Cutting Tools>

[0069] The cutting tool 101, which is not limited to any aspect of this disclosure, will be described in detail with the help of the accompanying drawings. Examples of cutting tools 101 include turning tools and rotary cutting tools. Examples of turning tools include grooving tools and parting tools. Figure 12 In the example shown (not specified), the cutting tool 101 is a parting tool.

[0070] The cutting tool 101 may have a tool holder 103 and an insert 1. The tool holder 103 and the insert 1 are separate components, and the tool holder 103 is a component for holding the insert 1. If the insert 1 wears during the cutting of the workpiece 201 used to manufacture the workpiece 203, the worn insert 1 can be removed from the tool holder 103 and another insert 1 can be installed on the tool holder 103. By changing the insert 1, the cutting of the workpiece 201 can be continuously performed.

[0071] The handle 103 can also be a long, thin, extended rod shape. Specifically, as... Figure 12 As shown in the undefined example, the handle 103 can also be a quadrangular prism shape. The handle 103 can also be as follows: Figure 12 and Figure 15As shown in the undefined example, it extends from the first end 103a toward the second end 103b.

[0072] The handle 103 may also have an upper jaw 105, a lower jaw 107, and a cutting groove 109 located on one side of the first end 103a. The cutting groove 109 may also be a space located between the upper jaw 105 and the lower jaw 107. The blade 1 can be inserted into the cutting groove 109. The blade 1 can also be fixed to the handle 103 by clamping it with the upper jaw 105 and the lower jaw 107.

[0073] like Figure 13 As in the undefined example shown, the blade 1 can also be fixed to the shank 103 by a screw 111. For example, a threaded hole may be provided in the upper jaw 105 of the shank 103, and a threaded groove may be provided in the lower jaw 107 of the shank 103. The blade 1 can also be installed in the cutter groove 109 by inserting the screw 111 into the threaded hole in the upper jaw 105 and fixing the screw 111 in the aforementioned threaded groove. Alternatively, the blade 1 can be installed in the cutter groove 109 by a so-called self-binding method without using the screw 111. In these cases, the blade 1 can also be positioned within the cutter groove 109.

[0074] As components of the handle 103, steel, cast iron, etc., can be used. In particular, when steel is used among these components, the handle 103 has high toughness.

[0075] <Methods for manufacturing machined parts>

[0076] Next, a method for manufacturing a machined object from an undefined aspect of this disclosure will be described using the accompanying drawings.

[0077] The workpiece 203 is manufactured by machining the workpiece 201. The manufacturing method of the workpiece 203 in this embodiment may include the following steps:

[0078] (1) The process of rotating the workpiece 201;

[0079] (2) A process of bringing the cutting tool 101, as exemplified in the above embodiment, into contact with the rotating workpiece 201; and

[0080] (3) The process of removing the cutting tool 101 from the workpiece 201.

[0081] More specifically, firstly, such as Figure 17 As shown in the undefined example, the workpiece 201 can be rotated about axis O2, and the cutting tool 101 can be brought relatively close to the workpiece 201. Next, as... Figure 18As shown in the undefined example, at least a portion of the cutting edge 25 in the cutting tool 101 can be brought into contact with the workpiece 201 to cut the workpiece 201. Furthermore, as... Figure 19 As shown in the undefined example, the cutting tool 101 can be moved relatively away from the workpiece 201.

[0082] like Figure 17 As shown in the undefined example, the cutting tool 101 can be moved in the Y1 direction while the shaft O2 is fixed and the workpiece 201 is rotated, thereby bringing the cutting tool 101 closer to the workpiece 201.

[0083] In addition, such as Figure 18 As shown in the undefined example, the cutting tool 101 can move in the Y2 direction while at least a portion of the part of the blade 1 used as the cutting edge 25 is in contact with the rotating workpiece 201, thereby cutting the workpiece 201.

[0084] In addition, such as Figure 19 As shown in the undefined example, the cutting tool 101 can be moved in the Y3 direction while the workpiece 201 is rotating, thereby moving the cutting tool 101 away from the workpiece 201.

[0085] In each process, the cutting tool 101 is moved so that it comes into contact with the workpiece 201 or moves away from the workpiece 201, but this method is not limited to this.

[0086] For example, in step (1), the workpiece 201 can be brought close to the cutting tool 101. Similarly, in step (3), the workpiece 201 can be moved away from the cutting tool 101. While the cutting process is being performed continuously, the workpiece 201 is kept in a rotating state, and the process of bringing at least a portion of the cutting edge 25 of the insert 1 into contact with different positions of the workpiece 201 is repeated.

[0087] Examples of materials that can be used to make the workpiece 201 include hardened steel, carbon steel, alloy steel, stainless steel, cast iron, or non-ferrous metals.

[0088] The invention disclosed above has been described based on the accompanying drawings and embodiments. However, the invention disclosed herein is not limited to the embodiments described above. That is, various modifications can be made to the invention within the scope shown in this disclosure, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of this disclosure. It should be noted that anyone skilled in the art can easily make various modifications or alterations based on this disclosure. Furthermore, it should be noted that these modifications or alterations are included within the scope of this disclosure.

[0089] Explanation of reference numerals in the attached figures:

[0090] 1··· Blade

[0091] 1a··Frontend

[0092] 1b Backend

[0093] 3. Main body

[0094] 5··· Cutting section

[0095] 5a··First Cutting Section

[0096] 5b··Second Cutting Section

[0097] 7··· Upper surface

[0098] 9··· Lower surface

[0099] 11··· Side View

[0100] 13···First Trough

[0101] 15···Second slot

[0102] 17···First District

[0103] 19···Second Region

[0104] 21···Front-end

[0105] 23··· Top surface

[0106] 25··· Cutting edge

[0107] 27···Third Region

[0108] 29···Fourth Region

[0109] 101··· Cutting tools

[0110] 103··· Handle

[0111] 103a··First End

[0112] 103b··Second End

[0113] 105··· Upper palate

[0114] 107··· Lower jaw

[0115] 109··· Tool Groove

[0116] 111··· Screw

[0117] 201···Workpiece

[0118] 203···Workpiece being machined.

Claims

1. A cutting insert having a prism shape extending along a central axis from a front end to a rear end, wherein, The cutting blade has: A cutting section, located on one side of the front end, and having a cutting edge located at the front end; as well as The main body is located on the rear end side, which is closer to the cutting part than the cutting part. The main body portion has: The upper surface has a first V-shaped groove extending along the central axis; and The lower surface, located on the opposite side of the upper surface, has a second V-shaped groove extending along the central axis. The first slot has: The first region is located on one side of the rear end; The second region is located on the front end side relative to the first region; as well as The fourth region is located between the first region and the second region. The opening angle of the first groove in the first region is smaller than the opening angle of the first groove in the second region. The opening angle of the second groove is constant in the direction along the central axis. The opening angles of the first grooves in the first region and the second region are respectively constant. The opening angle of the first groove in the fourth region increases as it approaches the second region.

2. The cutting insert according to claim 1, wherein, The first groove also has a third region located on the front end side of the second region. The opening angle of the first groove in the third region is smaller than the opening angle of the first groove in the second region.

3. The cutting insert according to claim 2, wherein, The opening angle of the first groove in the third region is the same as the opening angle of the first groove in the first region.

4. The cutting insert according to any one of claims 1 to 3, wherein, Along the central axis, the length of the second region is longer than the length of the first region.

5. The cutting insert according to any one of claims 1 to 3, wherein, The opening angle of the second groove is the same as the opening angle of the first groove in the second region.

6. A cutting tool, wherein, The cutting tool has: The handle is rod-shaped, extending from a first end toward a second end, and has a groove at the first end; and The cutting insert according to any one of claims 1 to 5, wherein it is located within the tool groove.

7. A method for manufacturing a workpiece by cutting, wherein, The method for manufacturing the workpiece includes: The process of rotating the workpiece; The process of bringing the cutting tool of claim 6 into contact with the rotating workpiece; and The process of removing the cutting tool from the workpiece.

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