Cutting insert, cutting tool, and method of manufacturing a workpiece

Abstract

The cutting insert of which the unbounded face is not limited is a quadrangular prism shape extending along a central axis from a front end toward a rear end, and has a cutting portion and a body portion. The body portion has an upper surface having a V-shaped groove extending in parallel with the central axis. An opening portion of the groove and a bottom portion are respectively a convex shape protruding upward in a direction along the central axis. The first groove has a first region located on the rear end side and a second region located at a position more on the front end side than the first region. An opening angle of the first groove in the first region is smaller than an opening angle of the first groove in the second region.

Description

Technical Field

[0001] This disclosure relates to cutting inserts (hereinafter also simply referred to as "inserts") for cutting materials. Examples of cutting processes include grooving and drilling. Background Technology

[0002] As a cutting tool used for machining materials, for example, the cutting tool described in Patent Document 1 is cited. The cutting tool described in Patent Document 1 has an insert with a V-shaped groove on its upper surface, which extends along an axis. The insert is fixed to the support by abutting the groove on the upper surface of the insert against the upper jaw of the support. Furthermore, the insert can be attached to and detached from the support by sliding it relative to the support in the axial direction.

[0003] Existing technical documents

[0004] Patent documents

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

[0006] The cutting insert (blade) disclosed herein, which is not limited to one side, is a quadrangular prism shape extending along a central axis from a front end to a rear end, having: 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 V-shaped groove extending parallel to the central axis; a lower surface located on the opposite side of the upper surface; and a side surface connected to the upper and lower surfaces and extending along the central axis. The opening and bottom of the groove are convex shapes projecting upwards in the direction along the central axis. The 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 groove in the first region is smaller than the opening angle of the groove in the second region. 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 area A1 shown is an enlarged view.

[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 area A2 shown is an enlarged view.

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

[0013] Figure 7 It is Figure 6 The area A3 shown is an enlarged view.

[0014] Figure 8 It means Figure 7 An enlarged view of a modified example of the blade shown.

[0015] Figure 9 Observed from B3 direction Figure 3 The blade shown is a side view.

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

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

[0018] Figure 12 yes Figure 4 The sectional view of section XII-XII shown.

[0019] Figure 13 This is a perspective view of a cutting tool in an undefined embodiment.

[0020] Figure 14 It is Figure 13 The area A4 shown is an enlarged view.

[0021] Figure 15 Viewed from the front side Figure 13 The top view of the cutting tool shown.

[0022] Figure 16 Viewed from B4 direction Figure 15 The side view of the cutting tool shown.

[0023] Figure 17 It is Figure 16 The area A5 shown is an enlarged view.

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

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

[0026] Figure 20 This is a schematic diagram illustrating a step in a method for manufacturing a machined object in an undefined embodiment. Detailed Implementation

[0027] The blade 1, representing an undefined aspect of this disclosure, will be described in detail with reference to the accompanying drawings. However, for convenience, only the essential main components are simplified in the figures referred to below, based on the description of undefined embodiments. Therefore, the blade 1 can include any structural components not shown in the referenced figures. Furthermore, the dimensions of the components in the figures are not limited to accurately representing the actual dimensions of the structural components and the dimensional ratios of each component.

[0028] like Figure 1 As shown in the undefined example, the blade 1 can also be a cylindrical shape extending along the central axis O1 from the front end 1a to the rear end 1b, having a main body 3 and a cutting part 5. The main body 3 can also be a part held by a support. The cutting part 5 can also have a cutting edge and is used in the cutting of the workpiece. The blade 1, as a cylindrical shape, can also be cylindrical, or it can be a polygonal prism shape. The blade 1, as a polygonal prism shape, can also be a square prism, a pentagonal prism, or a hexagonal prism shape.

[0029] The cutting tool 1 may also have one or more cutting portions 5. For example, the cutting tool 1 may also be as follows: Figure 1 As shown in the undefined example, it has two cutting portions 5. The cutting portions 5 can be located on the front end 1a or the rear end 1b side relative to the main body 3.

[0030] As Figure 1 In the undefined example shown, the two cutting portions 5 may also include a first cutting portion 5a and a second cutting portion 5b in the blade 1. The first cutting portion 5a may also be located on the front end 1a side of the blade 1. In other words, the main body 3 may also be located on the rear end 1b side of the blade 1, closer to the first cutting portion 5a. The relative positional relationship between the main body 3 and the first cutting portion 5a has been shown above. 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.

[0031] The second cutting portion 5b may also be located on the rear end 1b side of the insert 1. In other words, the main body 3 may also be located on the side closer to the front end 1a of the insert 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 may also be located on the side closer to the rear end 1b than the central portion of the insert 1. The insert 1 having the first cutting portion 5a and the second cutting portion 5b is generally referred to as a dog-bone type.

[0032] The first cutting part 5a and the second cutting part 5b can be either different from each other or the same. For example, Figure 1 As shown in the undefined example, when the front end 1a and rear end 1b of the blade 1 are flipped, the first cutting portion 5a and the second cutting portion 5b can also have identical structures. 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.

[0033] 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 along the direction of the central axis O1 can be set to about 10 to 25 mm. The length of the first cutting part 5a along the direction of the central axis O1 can be set to about 2 to 6 mm.

[0034] The main body 3 may also have an upper surface 7, a lower surface 9, and a pair of side surfaces 11. The lower surface 9 may also 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 width and the lower width may also 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.

[0035] A pair of side surfaces 11 may also be located between the upper surface 7 and the lower surface 9. The upper surface 7, the lower surface 9, and the pair of side surfaces 11 may also be rectangular shapes extending along the central axis O1 in the front view. When the upper and lower widths are the same, the spacing between the pair of side surfaces 11 may be fixed. When the lower width is smaller than the upper width, the spacing between the pair of side surfaces 11 may narrow as it approaches the lower surface 9.

[0036] The upper surface 7 may also have a first groove 13. The first groove 13 may also be a V-shape extending parallel to the central axis O1. The first groove 13 being V-shaped may also mean that, in a cross-section orthogonal to the central axis O1, the width of the first groove 13 decreases as it approaches the bottom 13a, in other words, as it approaches the lower surface 9. The bottom 13a of the first groove 13 may also mean, in a cross-section orthogonal to the central axis O1, the portion of the first groove 13 closest to the lower surface 9.

[0037] In a cross-section orthogonal to the central axis O1, if virtual straight lines are provided connecting the bottom 13a of the first groove 13 to the two openings 13b of the first groove 13, the intersection angle of these virtual straight lines can also be the opening angle θ1 of the first groove 13. For example, in a cross-section orthogonal to the central axis O1, if the first groove 13 is shown by two straight lines, the intersection angle of these straight lines can also be the opening angle θ1 of the first groove 13.

[0038] The first groove 13 may extend to the end on the front end 1a side of the main body 3, and may also be separated from the end on the front end 1a side of the main body 3. Similarly, the first groove 13 may extend to the end on the rear end 1b side of the main body 3, and may also be separated from the end on the rear end 1b side of the main body 3.

[0039] The opening 13b and bottom 13a of the first groove 13 can also be convex shapes that protrude upwards in the vertical direction. Specifically, when the first groove 13 is viewed in section including the bottom 13a along the central axis O1, the bottom 13a of the central portion of the first groove 13 can also be located above the bottoms 13a at both ends of the first groove 13. For example, it can also be as follows: Figure 7 As shown in the undefined example, the bottom 13a of the central portion of the first groove 13 is positioned above the virtual straight line connecting the bottoms 13a of the two ends of the first groove 13 in the direction along the central axis O1.

[0040] With the bottom 13a of the first groove 13 configured as described above, the attachment and removal of the insert 1 from the support becomes easier. For example, if the cutting tool is mounted on the machine tool with the tip 1a of the insert 1 facing downwards, the insert 1 may fall off if the force exerted by the support on the insert 1 weakens.

[0041] Therefore, when installing the blade 1 onto the bracket, it is necessary to press the blade 1 against the bracket while simultaneously increasing the force exerted by the bracket to hold the blade 1. Furthermore, when removing the blade 1 from the bracket, it is necessary to press the blade 1 against the bracket while simultaneously reducing the force exerted by the bracket to hold the blade 1. For these reasons, the installation and removal of the blade 1 can become complicated.

[0042] However, when the bottom 13a of the first slot 13 is configured as described above, the blade 1 is difficult to fall off. This is because when the blade 1 is being installed or removed from the bracket, the top 13a1 at the top of the bottom 13a is easily caught by the bracket. Therefore, the blade 1 is difficult to fall off, and the installation and removal of the blade 1 from the bracket becomes easier.

[0043] Furthermore, in a side view, the opening 13b in the central portion of the first groove 13 may be located above the openings 13b at both ends of the first groove 13. For example, it may be as follows: Figure 7 As shown in the undefined example, the opening 13b of the central portion of the first groove 13 is positioned above the virtual straight line connecting the openings 13b at both ends of the first groove 13.

[0044] The following description addresses the case where the bottom 13a of the first groove 13 is a convex shape protruding upwards along the central axis O1, and the height of the opening 13b of the first groove 13 is fixed. In this case, the depth of the first groove 13 in the central portion of the first groove 13 may be shallower compared to the two ends of the first groove 13. Therefore, when assembling or disassembling the blade 1 relative to the bracket, the blade 1 may deviate from its position in the lateral direction, or the blade 1 may detach from the bracket in the lateral direction.

[0045] However, when the opening 13b of the first groove 13 is configured as described above, the depth of the first groove 13 in the central portion of the first groove 13 is easily ensured. Therefore, when the blade 1 is attached to or detached from the bracket, the first groove 13 is easily and stably held in place by the bracket even if the position of the blade 1 in the lateral direction deviates. As a result, it is difficult for the position of the blade 1 to deviate in the lateral direction, and furthermore, it is difficult for the blade 1 to fall off the bracket in the lateral direction.

[0046] Along the central axis O1, the top 13a1 of the bottom 13a of the first groove 13 and the top 13b1 of the first groove 13 located at the top of the opening 13b can also be in the same position. In this case, it is easy to ensure the depth of the first groove 13 in the central part of the first groove 13. Therefore, when assembling or disassembling the blade 1 relative to the support, it is more difficult to cause a lateral deviation in the position of the blade 1.

[0047] The convex shapes of the bottom 13a and the opening 13b described above are not limited to a specific shape. For example, the convex shape can be triangular or trapezoidal. Furthermore, the opening 13b of the first groove 13 can also be a convex curve shape protruding upwards along the central axis O1. When the opening 13b has the aforementioned convex curve shape, it is difficult to create a notch in the opening 13b when assembling or disassembling the blade 1 relative to the support.

[0048] The bottom 13a of the first groove 13 can also be a convex curve shape protruding upward along the direction of the central axis O1. When the bottom 13a has the above-mentioned convex curve shape, it is difficult to create a notch in the bottom 13a when assembling or disassembling the blade 1 from the bracket.

[0049] The bottom 13a of the first groove 13 can also be composed of a straight section or a convex curve section. Figure 8 In one undefined example shown, the bottom 13a of the first groove 13 can be divided into a central portion 13aa, a front end portion 13ab, and a rear end portion 13ac. The central portion 13aa can also be the central part of the bottom 13a of the first groove 13 along the direction of the central axis O1. The front end portion 13ab can also be the portion located on the side of the front end 1a of the central portion 13aa, and can also include the end portion on the side of the front end 1a of the bottom 13a. The rear end portion 13ac can also be the portion located on the side of the rear end 1b of the central portion 13aa, and can also include the end portion on the side of the rear end 1b of the bottom 13a.

[0050] The front end portion 13ab can also be a convex curve shape protruding upwards. In this case, it is difficult to create a notch at the bottom 13a when removing the blade 1 relative to the bracket. Furthermore, the rear end portion 13ac can also be a convex curve shape protruding upwards. In this case, it is difficult to create a notch at the bottom 13a when mounting the blade 1 relative to the bracket.

[0051] The central portion 13aa can also be a straight line. In this case, the blade 1 is easily and stably constrained by the support. Furthermore, when the central portion 13aa is a straight line, it can also be parallel to the central axis O1. In this case, the blade 1 is more easily and stably constrained by the support.

[0052] In the case where the bottom 13a of the first groove 13 is a convex shape protruding upward along the direction of the central axis O1, the difference between the top 13a1 and the lowest position in the bottom 13a in the vertical direction is set as the height difference H1. This height difference H1 is not limited to a specific value, but is set to, for example, 0.05 to 1 [mm].

[0053] Furthermore, when the opening 13b of the first groove 13 is a convex shape protruding upward along the direction of the central axis O1, the difference between the top 13b1 and the lowest position in the opening 13b in the vertical direction is set as the height difference H2. This height difference H2 is not limited to a specific value, but can be set to, for example, 0.02 to 0.07 [mm].

[0054] Here, the height difference H1 and height difference H2 can be the same value, or they can be different values. For example, the height difference H1 can be larger than the height difference H2. In this case, the positional deviation of the blade 1 in the horizontal direction is suppressed, and the top 13a1 of the bottom 13a is more easily caught by the bracket.

[0055] The lower surface 9 may also have a second groove 15. The second groove 15 may also be a V-shape extending along the central axis O1. The second groove 15 being V-shaped may also 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 15a, in other words, as it approaches the upper surface 7. The bottom 15a of the second groove 15 may also mean, in a cross-section orthogonal to the central axis O1, the portion of the second groove 15 closest to the upper surface 7.

[0056] In a cross-section orthogonal to the central axis O1, if virtual straight lines are provided connecting the bottom 15a of the second groove 15 to the two openings 15b of the second groove 15, the intersection angle of these virtual straight lines can also be the opening angle θ2 of the second groove 15. For example, in a cross-section orthogonal to the central axis O1, if the second groove 15 is shown by two straight lines, the intersection angle of these straight lines can also be the opening angle θ2 of the second groove 15.

[0057] The second groove 15 may extend to the end on the front end 1a side of the main body 3, and may also be separated from the end on the front end 1a side of the main body 3. Similarly, the second groove 15 may extend to the end on the rear end 1b side of the main body 3, and may also be separated from the end on the rear end 1b side of the main body 3.

[0058] The first groove 13 and the second groove 15 can also be used to improve the positioning accuracy when inserting the blade 1 into the bracket. Furthermore, the first groove 13 and the second groove 15 can also be used to increase the restraining force when fixing the blade 1 to the bracket. For example, by having a protrusion with the upper jaw portion of the bracket abutting against the first groove 13, and a protrusion with the lower jaw portion of the bracket abutting against the second groove 15, the aforementioned improvement in positioning accuracy and increase in restraining force can also be achieved.

[0059] The opening angle θ1 of the first groove 13 can be fixed in the direction along the central axis O1, or it can vary in the direction along the central axis O1. That is, when observing different parts of the first groove 13 in the direction along the central axis O1 in a cross section orthogonal to the central axis O1, the opening angle θ1 of the first groove 13 in each cross section can be the same or different.

[0060] The first groove 13 may also have a first region 17 and a second region 19. The first region 17 may also be located on the rear end 1b side of the first groove 13. The second region 19 may also 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 also be located on the rear end 1b side of the main body 3, compared to the central portion.

[0061] When the first slot 13 has a first region 17 and a second region 19, the opening angles θ1 of these regions can be different from each other. For example, the opening angle θ1 of the first slot 13 in the first region 17 is the opening angle θ11, and the opening angle θ1 of the first slot 13 in the second region 19 is the opening angle θ12. In this case, the opening angle θ11 can also be smaller than the opening angle θ12. In this case, the bracket is easy to assemble and disassemble and can be stably constrained by the bracket for the following reasons.

[0062] The blade 1 is installed into the bracket by inserting it from the front end 1a side toward the rear end 1b side. Here, the first region 17 may also be located on the rear end 1b side compared to the second region 19. In this case, the first region 17 may also contact the bracket 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 difficult to produce a lateral displacement of the blade 1's position. This is because the first region 17, with its small opening angle θ11 and steep groove surface, easily becomes an obstacle relative to the lateral displacement of the blade 1's position.

[0063] Furthermore, the case where the opening angle θ12 of the first groove 13 in the second region 19 is larger than the opening angle θ2 of the second groove 15 in the first region 17 will be explained. In this case, when the second region 19 is in contact with the support and the blade 1 is fixed to the support, the restraining force applied from the maxilla of the support to the blade 1 is easily transmitted in the vertical direction. This is because the opening angle θ12 of the first groove 13 in the second region 19 is larger than the opening angle θ2 of the second groove 15 in the first region 17, and therefore the restraining force applied from the maxilla of the support to the second region 19 is easily and efficiently transmitted in the vertical direction.

[0064] The opening angle θ11 of region 17 is not limited to a specific value. For example, the opening angle θ11 of region 17 can be set to 130° to 140°. The opening angle θ12 of region 29 is not limited to a specific value. For example, the opening angle θ12 of region 29 can be set to 140° to 150°.

[0065] The opening angle θ11 of region 17 can be fixed in the direction along the central axis O1, or it can be varied in the direction along the central axis O1. The opening angle θ12 of region 19 can also be fixed in the direction along the central axis O1, or it can be varied in the direction along the central axis O1.

[0066] When the first groove 13 has a first region 17 and a second region 19, and the opening angles θ1 of these regions are different from each other, the depths of the first groove 13 in these regions can also be different from each other. For example, the depth of the first groove 13 in the first region 17 can be deeper than the depth of the first groove 13 in the second region 19.

[0067] The opening angle θ2 of the second groove 15 can be fixed in the direction along the central axis O1, or it can vary in the direction along the central axis O1. That is, when different parts of the second groove 15 in the direction along the central axis O1 are observed in cross-sections orthogonal to the central axis O1, the opening angle θ2 of the second groove 15 in each cross-section can be the same or different.

[0068] Compared to the upper surface 7 of the main body 3 and the upper jaw of the support, 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 support. This is because, not only is it easier to apply the constraint force caused by the main body 3 being clamped by the upper and lower jaws, but also the main component force of the cutting load generated during the cutting of the material being cut to the lower surface 9 of the main body 3 and the lower jaw of the support. Here, when the opening angle θ2 of the second groove 15 is fixed in the direction along the central axis O1, the deviation of the load of the second groove 15 in the direction along the central axis O1 can be reduced. Therefore, the insert 1 is more easily constrained by the support.

[0069] From the viewpoint of the stability of the constraint of the blade 1 relative to the support, the second groove 15 can also have two flat surfaces that approach each other as they approach the bottom 15a. In this case, the second groove 15 and the support can easily make surface contact. Therefore, the deviation of the load applied from the second groove 15 to the support can be reduced.

[0070] The opening angle θ2 of the second slot 15 is not limited to a specific value. For example, the opening angle θ2 of the second slot 15 can be set to 140° to 150°. The opening angle θ2 of the second slot 15 can also be the same as the opening angle θ12 of the first slot 13 in the second region 19. In this case, the blade 1 can be easily and smoothly installed onto the bracket. The aforementioned "same" does not require that the two opening angles be strictly identical. The difference δθ between the other opening angles can also be approximately 2° or less.

[0071] The first cutting portion 5a located on one side of the front end 1a in 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 also be the face located at the front end 1a in the insert 1. The upper end face 23 may also 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 main 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 clearance surface for the cutting edge 25. The upper end face 23 can function as a forward tilting surface for the cutting edge 25.

[0072] 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 also be located on the front end 1a side of the second region 19. In other words, the second region 19 may also 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.

[0073] 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 the opening angle θ13. The opening angle θ13 may also 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 install and remove from the support and the blade 1 is easily and stably constrained by the support for the following reasons.

[0074] 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 difficult to produce a positional deviation of the blade 1 in the lateral direction. This is because the third region 27, with its small opening angle θ13 and steep groove surface, is prone to becoming an obstacle relative to the positional deviation of the blade 1 in the lateral direction.

[0075] The following description addresses a situation where the first groove 13 has a relatively small opening angle θ13 for a first region 17 located on the rear end 1b side and a third region 27 located on the front end 1a side. In this case, the positional deviation of the blade 1 in the lateral direction is easily reduced at both the front end 1a side and the rear end 1b side of the main body. Therefore, when the blade 1 is mounted on the bracket, the positional deviation of the blade 1 in the lateral direction can be effectively reduced.

[0076] In addition, the following are examples of such... Figure 5 The following description will focus on an example where the blade 1 has a first cutting portion 5a and a second cutting portion 5b, which is not specified in the description. In this case, even if the front end 1a and the rear end 1b of the blade 1 are flipped and the blade 1 is mounted to the bracket, it is difficult for the blade 1 to deviate from its position in the lateral direction through the third region 27.

[0077] The opening angle θ13 of the third region 27 is not limited to a specific value. For example, the opening angle θ13 of the third region 27 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 deviation of the insert 1 in the transverse 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.

[0078] The statement that the opening angle θ13 is the same as the opening angle θ11 does not require that these opening angles be strictly identical. Similar to the cases of opening angles θ2 and θ12 mentioned above, the difference δθ between the two opening angles can also be approximately less than 2°.

[0079] The first groove 13 may also have a fourth region 29 in addition to the first region 17 and the second region 19. The fourth region 29 may also 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 also be fixed respectively. The opening angle θ14 of the first groove 13 in the fourth region 29 may also increase as it approaches the second region 19.

[0080] With the opening angle θ11 of the first groove 13 in the first region 17 fixed, the effect of reducing the lateral positional deviation of the blade 1 caused by the first region 17 can be stably obtained. Furthermore, with the opening angle θ12 of the first groove 13 in the second region 19 fixed, the influence of the position of the blade 1 abutting against the maxilla of the support is reduced, and the constraint force applied from the maxilla of the support to the second region 19 is easily and effectively transmitted in the vertical direction. That is, the dependence on the shape of the support is reduced, and the versatility of the blade 1 is high.

[0081] 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 likelihood of the opening angle of the first groove 13 changing drastically from the first region 17 to the second region 19 decreases. Therefore, the blade 1 can be smoothly mounted onto the support.

[0082] In the above, the first groove 13 may also have a first region 17, a second region 19 and a fourth region 29, but not a third region 27. Alternatively, it may have a first region 17, a second region 19, a third region 27 and a fourth region 29.

[0083] From the viewpoint of reducing the influence of the position of the blade 1 that abuts against the maxilla of the support, 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 also be 30 to 40.

[0084] Examples of materials that can be used for the cutting tool 1 include superhard alloys and cermets. Examples of components that can be used for superhard alloys include 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.

[0085] Furthermore, cermets can also be sintered composite materials obtained by incorporating metals into ceramic compositions. Examples of cermets include titanium compounds with titanium carbide (TIC) or titanium nitride (TIN) as the main components. However, the material of blade 1 is not limited to the above-mentioned compositions.

[0086] The surface of the blade 1 can also be coated with a film using chemical vapor deposition (CVD) or physical vapor deposition (PVD). Examples of coating compositions include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), and aluminum oxide (Al2O3).

[0087] <Cutting Tools>

[0088] The cutting tool 101, which is not defined in this disclosure, will be described in detail with reference to the accompanying drawings. Examples of cutting tools 101 include turning tools and milling tools. Examples of turning tools include grooving tools and drilling tools. Figure 13 In one example not specified, the cutting tool 101 is a piercing tool.

[0089] The cutting tool 101 includes a support 103 and an insert 1. The support 103 and the insert 1 are separate components, with the support 103 serving to hold 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 support 103, and another insert 1 can be fitted onto the support 103. By replacing the insert 1, the cutting of the workpiece 201 can continue.

[0090] The support 103 can also be in the shape of a slender, extended rod. Specifically, such as... Figure 13 As shown in the undefined example, the support 103 can also be in the shape of a tetragonal prism. For example... Figure 13 as well as Figure 16As in the undefined example shown, the support 103 may also extend from the first end 103a toward the second end 103b.

[0091] The support 103 may also have an upper jaw portion 105, a lower jaw portion 107, and a pocket 109 located on one side of the first end 103a. The pocket 109 may also be a space located between the upper jaw portion 105 and the lower jaw portion 107. The blade 1 can be inserted into the pocket 109. The blade 1 can also be fixed to the support 103 by clamping it with the upper jaw portion 105 and the lower jaw portion 107.

[0092] like Figure 14 As in the undefined example shown, the blade 1 can also be fixed to the bracket 103 by a screw 111. For example, a screw hole can be provided in the upper jaw portion 105 of the bracket 103, and a screw groove can be provided in the lower jaw portion 107 of the bracket 103. The screw 111 can be inserted into the screw hole in the upper jaw portion 105 and fixed in the screw groove, thereby mounting the blade 1 to the pouch 109. Alternatively, the blade 1 can be mounted to the pouch 109 by a so-called self-molding method without using a screw 111. In the above cases, the blade 1 can also be positioned inside the pouch 109.

[0093] As a component of the support 103, steel, cast iron, etc., can also be used. In particular, when steel is used in these components, the support 103 has high toughness.

[0094] <Methods for manufacturing machined parts>

[0095] Next, the method for manufacturing a machined object with an undefined side in this disclosure will be described with reference to the accompanying drawings.

[0096] The workpiece 203 is manufactured by machining the workpiece 201. The manufacturing method of the workpiece 203 in this embodiment includes the following steps:

[0097] (1) A process that rotates the material 201 being cut;

[0098] (2) The process of bringing the cutting tool 101, as represented in the above embodiment, into contact with the rotating workpiece 201; and

[0099] (3) The process of separating the cutting tool 101 from the material 201 being cut.

[0100] More specifically, firstly, as Figure 18 As in the undefined example shown, the workpiece 201 can also rotate about axis O2, and the cutting tool 101 can be brought close to the workpiece 201. Next, it can also be as follows... Figure 19As shown in the undefined example, at least a portion of the cutting edge 25 in the cutting tool 101 contacts the workpiece 201, thereby cutting the workpiece 201. Furthermore, it is also possible to... Figure 20 As shown in the undefined example, the cutting tool 101 is relatively far away from the material 201 being cut.

[0101] It is also possible to Figure 18 As shown in the undefined example, the cutting tool 101 is moved in the Y1 direction while the shaft O2 is fixed and the material to be cut 201 is rotated, thereby bringing the cutting tool 101 closer to the material to be cut 201.

[0102] In addition, it can also be like Figure 19 As shown in the undefined example, the cutting tool 101 is moved in the Y2 direction while at least a portion of the cutting edge in the blade is in contact with the rotating workpiece 201, thereby cutting the workpiece 201.

[0103] In addition, it can also be like Figure 20 As shown in the undefined example, while the workpiece 201 is rotating, the cutting tool 101 moves in the Y3 direction, thereby moving the cutting tool 101 away from the workpiece 201.

[0104] In each process, the cutting tool 101 is moved so that it comes into contact with the material 201 being cut, or the cutting tool 101 moves away from the material 201 being cut, but of course it is not limited to this method.

[0105] In process (1), for example, the material to be cut 201 may be brought close to the cutting tool 101. Similarly, in process (3), the material to be cut 201 may be moved away from the cutting tool 101. In the case of continuous cutting, the process of keeping the material to be cut 201 in a rotating state and repeatedly performing the process of at least a portion of the cutting edge in the insert 1 contacting different parts of the material to be cut 201 may be carried out.

[0106] Examples of materials that can be used to cut material 201 include hardened steel, carbon steel, alloy steel, stainless steel, cast iron, or non-ferrous metals.

[0107] --Explanation of symbols--

[0108] 1··· Blade

[0109] 1a··Frontend

[0110] 1b Backend

[0111] 3. Main body

[0112] 5··· Cutting section

[0113] 5a··First Cutting Section

[0114] 5b··Second Cutting Section

[0115] 7··· Upper surface

[0116] 9··· Lower surface

[0117] 11··· Side View

[0118] 13···First Slot

[0119] 13a··Bottom

[0120] 13a1·Top

[0121] 13b··Opening

[0122] 13b1·Top

[0123] 15···Second slot

[0124] 15a··Bottom

[0125] 15b··Opening

[0126] 17··· Area 1

[0127] 19··· Area 2

[0128] 21···Front-end face

[0129] 23··· Top surface

[0130] 25··· Cutting edge

[0131] 27··· Area 3

[0132] 29···Region 4

[0133] 101···Cutting tools 103···Support

[0134] 103a··First End

[0135] 103b··Second End

[0136] 105··· Maxilla

[0137] 107···Mandibular region

[0138] 109··· Pocket

[0139] 111···Screw 201···Material to be cut 203···Workpiece to be cut.

Claims

1. A cutting insert, which is a quadrangular prism shape extending along a central axis from a front end to a rear end, having: The cutting part is located on one side of the front end and has a cutting edge located at the front end; and The main body is located on the rear end side, which is closer to the cutting part. The main body portion has: The upper surface has a V-shaped groove extending parallel to the central axis; The lower surface is located on the opposite side of the upper surface; and The side surface connects to the upper surface and the lower surface and extends along the central axis. The opening and bottom of the groove are both convex shapes that protrude upwards along the central axis. When the groove is viewed in section including its bottom and along its central axis, the bottom of the central portion of the groove is located above the bottoms of its two ends. When viewed from the side, the opening in the central portion of the groove is located above the openings at both ends of the groove. The vertical difference between the top and the lowest position at the bottom of the groove is greater than the vertical difference between the top and the lowest position at the opening of the groove. The groove has: Region 1 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 groove in the first region is smaller than the opening angle of the groove in the second region. The opening angle of the groove in the fourth region increases as it approaches the second region.

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

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

4. The cutting insert according to any one of claims 1 to 3, wherein, The opening of the groove is a convex curve shape that protrudes upward along the direction of the central axis.

5. The cutting insert according to claim 4, wherein, The bottom of the groove is a convex curve shape that protrudes upward along the direction of the central axis.

6. The cutting insert according to claim 4, wherein, The central portion of the bottom of the groove along the central axis is straight. The portion of the bottom of the groove located on the side closer to the front end than the central portion has a convex curve shape that protrudes upwards.

7. The cutting insert according to any one of claims 1 to 3, wherein, The depth of the groove in the first region is greater than the depth of the groove in the second region.

8. A cutting tool, comprising: The support is a rod-shaped structure extending from a first end toward a second end, having a pouch located at the first end; and The cutting blade according to any one of claims 1 to 7 is located inside the pocket.

9. A method for manufacturing a workpiece by cutting, comprising: The process of rotating the material being cut; The process of bringing the cutting tool of claim 8 into contact with the rotating workpiece; and The process of separating the cutting tool from the material being cut.

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