Coated tool, cutting tool, and method for manufacturing cut workpiece

Abstract

This coated tool includes a substrate and at least one coating layer positioned on the substrate. The coating layer includes a cubic crystal containing: at least one element selected from elements of Group 4, Group 5, and Group 6 of the periodic table, Al, and Si; and at least one element selected from C and N. As regards the positive pole figure of the X-ray diffraction pattern of the coating layer, the X-ray intensity related to the (111) plane of the cubic crystal and the X-ray intensity related to the (200) plane of the cubic crystal monotonically increase within the tilting angle range of the coating layer from 0° to 90°.

Description

Methods for manufacturing coated tools, cutting tools, and machined products

[0001] SUMMARY OF THE DISCLOSURE Embodiments of the present disclosure relate to methods of manufacturing coated tools, cutting tools, and machined workpieces.

[0002] BACKGROUND ART As a tool used in cutting processes such as turning or milling, a coated tool is known in which the surface of a substrate made of cemented carbide, cermet, ceramics, or the like is coated with a coating layer to improve wear resistance and the like.

[0003] For example, a coated tool is known that comprises a substrate and a coating coated on the substrate surface, the coating including an intermediate film coated on the substrate surface and an oxide film coated on the intermediate film surface. The intermediate film is made of at least one material selected from the group consisting of TiN, TiCN, TiAlN, TiAlZrN, TiAlCrN, and AlCrN. The intermediate film is a cubic crystal. Among the diffraction lines of the intermediate film in an X-ray diffraction measurement using Cu-Kα radiation, the peak intensity of the (200) plane diffraction line of the intermediate film is the highest. The X-ray intensity distribution of the α axis of the pole figure for the (200) plane of the intermediate film shows the highest intensity in the α angle range of 80 to 90 degrees (see, for example, WO 2012 / 018063).

[0004] A coated tool according to one aspect of this embodiment includes a substrate and at least one coating layer located on the substrate, wherein the coating layer includes cubic crystals containing at least one element selected from among elements of Groups 4, 5, and 6 of the periodic table, Al, and Si, and at least one element selected from among C and N, and in an X-ray diffraction pole figure of the coating layer, the X-ray intensity associated with the (111) plane of the cubic crystals and the X-ray intensity associated with the (200) plane of the cubic crystals each monotonically increase within the tilt angle range of the coating layer from 0° to 90°.

[0005] FIG. 1 is a perspective view showing an example of a coated tool according to the present embodiment. FIG. 2 is a cross-sectional view showing an example of an insert according to the present embodiment. FIG. 3 is a diagram illustrating a method for obtaining an X-ray diffraction pole figure for the coating layer according to the present embodiment. FIG. 4 is a diagram illustrating an X-ray diffraction pole figure for the coating layer according to the present embodiment. FIG. 5 is a diagram illustrating an example of an X-ray intensity distribution for the (111) plane of cubic crystals contained in the coating layer according to the present embodiment. FIG. 6 is a diagram illustrating an example of an X-ray intensity distribution for the (200) plane of cubic crystals contained in the coating layer according to the present embodiment. FIG. 7 is a front view showing an example of a cutting tool according to the present embodiment. FIG. 8A is a schematic diagram illustrating a step of a method for manufacturing a machined product according to the embodiment. FIG. 8B is a schematic diagram illustrating a step of a method for manufacturing a machined product according to the embodiment. FIG. 8C is a schematic diagram illustrating a step of a method for manufacturing a machined product according to the embodiment. FIG. 9 is a diagram illustrating an X-ray intensity distribution for the (111) plane of cubic crystals contained in the coating layer according to the example. FIG. 10 is a diagram illustrating an X-ray intensity distribution for the (200) plane of cubic crystals contained in the coating layer according to the example. 11 and 12 are diagrams showing the distribution of X-ray intensity for the (111) and (200) planes of cubic crystals contained in the coating layer according to the comparative example, respectively.

[0006] Hereinafter, modes for carrying out the methods for manufacturing a coated tool, a cutting tool, and a machined product according to the present disclosure (hereinafter referred to as "embodiments") will be described in detail with reference to the drawings. The methods for manufacturing a coated tool, a cutting tool, and a machined product according to the present disclosure are not limited to the embodiments described below. In the following embodiments, the same components are designated by the same reference numerals, and redundant explanations will be omitted.

[0007] BACKGROUND ART As a tool used in cutting processes such as turning or milling, a coated tool is known in which the surface of a substrate made of cemented carbide, cermet, ceramics, or the like is coated with a coating layer to improve wear resistance and the like.

[0008] However, conventional coated tools have poor wear resistance, which can result in a shortened tool life.

[0009] Thus, the prior art has room for further improvement in terms of improving wear resistance.

[0010] Therefore, there is a need for a technology that can overcome the above-mentioned problems and improve wear resistance.

[0011] <Coated Tool> Fig. 1 is a perspective view showing an example of a coated tool according to this embodiment. As shown in Fig. 1, the coated tool 1 according to this embodiment has an insert 11.

[0012] (Insert 11) The insert 11 has, for example, a hexahedron shape in which the upper and lower surfaces (surfaces intersecting with the Z axis shown in FIG. 1) are shaped like a substantially parallelogram. The insert 11 according to this embodiment has a lower surface opposite to the upper surface, and has side surfaces between the upper and lower surfaces.

[0013] One corner portion of the insert 11 may function as a cutting edge portion. The cutting edge portion has a first surface (e.g., a part of the top surface) and a second surface (e.g., a part of the side surface) that is connected to the first surface. In this embodiment, the first surface functions as a "rake face," and the second surface functions as a "flank face." A cutting edge is located on at least a part of the ridge where the first surface and the second surface intersect, and the coated tool 1 cuts the workpiece by bringing this cutting edge into contact with the workpiece.

[0014] A through-hole 15 is located in the center of the insert 11, penetrating the insert 11 from top to bottom. The central axis of the through-hole 15 may pass through the center of the upper surface and the center of the lower surface. A screw 75 is inserted into the through-hole 15 to attach the coated tool 1 to a holder 70 (described later) (see FIG. 7 ).

[0015] 1 is merely an example and does not limit the shape of the coated tool according to the present disclosure. The coated tool according to the present disclosure may have, for example, a rod-shaped body having a rotation axis and extending from a first end to a second end, a cutting edge located at the first end of the body, and a groove extending spirally from the cutting edge toward the second end of the body.

[0016] Fig. 2 is a cross-sectional view showing an example of the insert according to the present embodiment. The cross section shown in Fig. 2 may be a cross section parallel to the central axis of the through hole 15. As shown in Fig. 2, the insert 11 has a base body 2 and at least one coating layer 3.

[0017] (Substrate 2) The substrate 2 is formed of, for example, a cemented carbide. The cemented carbide contains a hard phase containing at least W (tungsten), specifically WC (tungsten carbide). The cemented carbide may contain a binder phase containing at least one iron group element such as Ni (nickel) and Co (cobalt). As an example, the substrate 2 may be a WC-based cemented carbide whose main component is hard particles made of WC. Here, the main component refers to a cemented carbide whose main component is 80 mass % or more of the hard particles made of WC. When the substrate 2 is the above-mentioned cemented carbide, the substrate 2 has better heat resistance.

[0018] The substrate 2 may be a cermet. The cermet contains, for example, Ti (titanium), specifically, TiC (titanium carbide), TiN (titanium nitride), or TiCN (titanium carbonitride). The cermet may also contain at least one iron group element such as Ni and Co.

[0019] The substrate 2 may be a cubic boron nitride sintered body containing cubic boron nitride (cBN) particles. The substrate 2 is not limited to cubic boron nitride (cBN) particles, and may contain particles of hexagonal boron nitride (hBN), rhombohedral boron nitride (rBN), wurtzite boron nitride (wBN), or the like.

[0020] The substrate 2 may be made of ceramic. The ceramic may be, for example, Al ２ O ３ (aluminum oxide) may be contained. ２ O ３ (Aluminum oxide) includes, for example, κ-Al ２ O ３ and α-Al ２ O ３The ceramic may contain other elements in addition to aluminum oxide. For example, the ceramic may contain, in addition to aluminum oxide, at least one of magnesium (Mg), calcium (Ca), strontium (Sr), silicon (Si), and elements from Groups 3 and 4 of the periodic table.

[0021] (Coating layer 3) The coating layer 3 coats the substrate 2 for the purpose of improving the abrasion resistance, heat resistance, etc. of the substrate 2. In the example of FIG. 2, the coating layer 3 coats the entire substrate 2. The coating layer 3 is not particularly limited as long as it is located at least on the surface of the substrate 2. When the coating layer 3 is located on the first surface (here, the upper surface) of the substrate 2, the abrasion resistance and heat resistance of the first surface are high. When the coating layer 3 is located on the second surface (here, the side surface) of the substrate 2, the abrasion resistance and heat resistance of the second surface are high.

[0022] The coating layer 3 contains at least one element selected from the group 4, 5 and 6 elements of the periodic table, aluminum (Al), and silicon (Si), and at least one element selected from the group 10 carbon (C) and nitrogen (N). For example, the coating layer 3 contains Al ａ Ti ｂ M ｃ and at least one element selected from C and N. M is at least one element selected from elements of Groups 4, 5, and 6 of the periodic table (excluding chromium (Cr)) and Si. a, b, and c are 0≦a≦65 and 0≦b≦100, and a+b+c=100. The numerical ranges of a, b, and c may be numerical ranges representing the ratio of the content of each element to the total amount of metal elements contained in the coating layer 3. As an example, the composition of the coating layer 3 may be AlTiWNbSiN. The notation AlTiWNbSiN indicates the type of constituent elements and does not indicate that the atomic ratio of the constituent elements is equal. The coating layer 3 does not necessarily need to contain M. In this case, the composition of the coating layer 3 may be AlTiN, for example. The notation AlTiN indicates the type of constituent elements and does not indicate that the atomic ratio of the constituent elements is equal. The coating layer 3 has high hardness at high temperatures (for example, 1100° C.) and high oxidation resistance.

[0023] The coating layer 3 may be polycrystalline. The coating layer 3 includes cubic crystals. The coating layer 3 may be polycrystalline containing cubic crystals as the main component. Here, the term "main component" refers to a polycrystalline material containing 90 mass % or more of cubic crystals.

[0024] The thickness of the coating layer 3 may be 1 μm or more and 7 μm or less. In particular, when the thickness of the coating layer 3 is 1.5 μm or more, it becomes possible to more easily improve the wear resistance of the coated tool 1. When the thickness of the coating layer 3 is 3 μm or less, it becomes possible to more easily improve the fracture resistance of the coating layer 3. Therefore, when the thickness of the coating layer 3 is 1.5 μm or more and 3 μm or less, it becomes possible to improve the wear resistance and fracture resistance of the coating layer 3.

[0025] Here, an X-ray diffraction (XRD) pole figure for the coating layer 3 will be described with reference to Fig. 3 and Fig. 4. Fig. 3 is a diagram for explaining a method for obtaining an X-ray diffraction pole figure for the coating layer according to this embodiment. Fig. 4 is a diagram for explaining an X-ray diffraction pole figure for the coating layer according to this embodiment.

[0026] To obtain an X-ray diffraction pole figure for the coating layer 3, for example, as shown in Fig. 3, an X-ray diffraction apparatus including a stage 31, an X-ray source 32, and an X-ray detector 33 is used. The stage 31 has disposed on its surface an insert 11 including the substrate 2 and the coating layer 3 located on the surface of the substrate 2. The X-ray source 32 irradiates X-rays onto the coating layer 3 of the insert 11 placed on the stage 31. The X-ray detector 33 detects the intensity of diffracted X-rays reflected from a specific crystal plane of the coating layer 3 irradiated with X-rays.

[0027] Here, the X-ray source 32 and the X-ray detector 33 are positioned so that the angle between the incident angle of the X-rays irradiated onto the coating layer 3 of the insert 11 placed on the stage 31 and the reflection angle of the diffracted X-rays reflected from a specific crystal plane of the coating layer 3 is 2θ, which is twice the Bragg angle θ. The Bragg angle θ is determined by the wavelength of the X-rays and the spacing between the specific crystal planes. The angle 2θ between the incident angle of the X-rays irradiated onto the coating layer 3 and the reflection angle of the diffracted X-rays reflected from a specific crystal plane of the coating layer 3 is called the diffraction angle. This makes it possible to measure the intensity of the diffracted X-rays reflected by a specific crystal plane of the coating layer 3.

[0028] As shown in Fig. 3, the stage 31 is rotatable around an axis parallel to the surface of the coating layer 3. As shown in Fig. 3, rotating the stage 31 by an angle α around the axis parallel to the surface of the coating layer 3 makes it possible to tilt the surface of the coating layer 3 by the angle α with respect to the plane of incidence of the X-rays. The plane of incidence of the X-rays is a plane that includes X-rays irradiated onto the coating layer 3 and X-rays reflected from specific crystal planes of the coating layer 3. The angle α around the axis parallel to the surface of the coating layer 3 is called the tilt angle of the coating layer 3. The tilt angle α of the coating layer 3 is equal to or greater than 0° and equal to or less than 90°.

[0029] As shown in Fig. 3, the stage 31 is rotatable around an axis perpendicular to the surface of the coating layer 3. As shown in Fig. 3, when the stage 31 is rotated by an angle β around the axis perpendicular to the surface of the coating layer 3, the plane of incidence of the X-rays on the surface of the coating layer 3 can be rotated by an angle β around the normal to the surface of the coating layer 3. The angle β around the axis perpendicular to the surface of the coating layer 3 is called the in-plane rotation angle of the coating layer 3. The in-plane rotation angle β of the coating layer 3 is equal to or greater than 0° and equal to or less than 360°. However, the in-plane rotation angle β of the coating layer 3 = 0° and the in-plane rotation angle β of the coating layer 3 = 360° are the same.

[0030] In this way, it is possible to measure the intensity of diffracted X-rays from a specific crystal plane of the coating layer 3 for a tilt angle α of the coating layer 3 in the range of 0° to 90° and an in-plane rotation angle β of the coating layer 3 in the range of 0° to 360°. That is, it is possible to obtain a distribution of the intensity of diffracted X-rays from a specific crystal plane of the coating layer 3 measured for a tilt angle α of the coating layer 3 in the range of 0° to 90° and an in-plane rotation angle β of the coating layer 3 in the range of 0° to 360°. The distribution of the intensity of diffracted X-rays from a specific crystal plane of the coating layer 3 measured for a tilt angle α of the coating layer 3 in the range of 0° to 90° and an in-plane rotation angle β of the coating layer 3 in the range of 0° to 360° is called a pole figure for the specific crystal plane of the coating layer 3.

[0031] As shown in Figure 4, a pole figure for a specific crystal plane of the coating layer 3 is a circular diagram. In the pole figure, the radial direction from the center of the circle indicates the tilt angle α of the coating layer 3 in the range of 0° to 90°. For example, the center of the circle indicates the tilt angle α of the coating layer 3 = 90°, and the circumference of the circle indicates the tilt angle α of the coating layer 3 = 0°. In the pole figure, the circumferential direction around the center of the circle indicates the in-plane rotation angle β of the coating layer 3 in the range of 0° to 360°. For example, the vertical direction of the pole figure indicates the in-plane rotation angles β = 0° (or 360°) and 180° of the coating layer 3, and the horizontal direction of the pole figure indicates the in-plane rotation angles β = 90° and 270° of the coating layer 3.

[0032] In the pole figure for a specific crystal plane of the coating layer 3, the intensity of diffracted X-rays from the specific crystal plane of the coating layer 3 measured with respect to the tilt angle α and the in-plane rotation angle β of the coating layer 3 is plotted. The intensity of diffracted X-rays from the specific crystal plane of the coating layer 3 is measured at regular intervals Δα of the tilt angle α of the coating layer 3 and at regular intervals Δβ of the in-plane rotation angle β of the coating layer 3 and plotted in the pole figure.

[0033] In this embodiment, the distribution of the intensity of diffracted X-rays from a specific crystal plane of the coating layer 3 with respect to the tilt angle α of the coating layer 3 is obtained from a pole figure for the specific crystal plane of the coating layer 3 .

[0034] First, the average value of the intensity of diffracted X-rays from a specific crystal plane of the coating layer 3 measured at a certain step Δβ for an in-plane rotation angle β of the coating layer 3 in the range of 0° to 360° is calculated for a certain tilt angle α of the coating layer 3. Next, the average value of the intensity of diffracted X-rays from the specific crystal plane of the coating layer 3 calculated as above for each certain step Δα for a tilt angle α of the coating layer 3 in the range of 0° to 90° is plotted. As shown in the examples described later, when evaluating the characteristics of the coated tool of this embodiment, evaluation may be performed in 2.5° steps, for example.

[0035] Next, polynomial approximation is performed on the average values ​​of the intensities of diffracted X-rays from a specific crystal plane of the coating layer 3 plotted against the tilt angle α of the coating layer 3 in the range of 0° to 90°. This makes it possible to obtain a polynomial approximation curve that indicates the intensities of diffracted X-rays from the specific crystal plane of the coating layer 3 with respect to the tilt angle α of the coating layer 3. The polynomial approximation curve obtained in this manner indicates the distribution of the intensities of diffracted X-rays from the specific crystal plane of the coating layer 3 with respect to the tilt angle α of the coating layer 3.

[0036] In this embodiment, the (111) plane and the (200) plane of the cubic crystal contained in the coating layer 3 are used as the specific crystal planes of the coating layer 3. Here, the distribution of the intensity of diffracted X-rays from the (111) plane of the cubic crystal contained in the coating layer 3 with respect to the tilt angle α of the coating layer 3 and the distribution of the intensity of diffracted X-rays from the (200) plane of the cubic crystal contained in the coating layer 3 with respect to the tilt angle α of the coating layer 3 will be described.

[0037] Fig. 5 is a diagram showing an example of the distribution of X-ray intensity for the (111) plane of the cubic crystal contained in the coating layer according to this embodiment. Fig. 6 is a diagram showing an example of the distribution of X-ray intensity for the (200) plane of the cubic crystal contained in the coating layer according to this embodiment. In Fig. 5 and Fig. 6, the horizontal axis represents the tilt angle α (°) of the coating layer 3, and the vertical axis represents the X-ray intensity (arbitrary unit).

[0038] In this embodiment, the intensity of X-rays associated with the (111) plane of the cubic crystals contained in the coating layer 3 and the intensity of X-rays associated with the (200) plane of the cubic crystals contained in the coating layer 3 each monotonically increase within the range of the tilt angle α of the coating layer 3 from 0° to 90°.

[0039] Here, monotonically increasing means that the X-ray intensity remains constant or increases within the range of the tilt angle α of the coating layer 3 from 0° to 90°. In other words, monotonically increasing means that the distribution of the X-ray intensity does not have any maximum or minimum value within the range of the tilt angle α of the coating layer 3 from 0° to 90°.

[0040] For example, as shown in FIG. 5 , the polynomial approximation curve showing the distribution of X-ray intensity for the (111) plane of the cubic crystals contained in the coating layer 3 has neither a maximum value nor a minimum value, and the distribution monotonically increases within the range of the tilt angle α of the coating layer 3 from 0° to 90°. For example, as shown in FIG. 6 , the polynomial approximation curve showing the distribution of X-ray intensity for the (200) plane of the cubic crystals contained in the coating layer 3 has neither a maximum value nor a minimum value, and the distribution monotonically increases within the range of the tilt angle α of the coating layer 3 from 0° to 90°. The degree of the polynomial approximation curve may be set to a value between 3 and 5. Instead of the polynomial approximation curve, a moving average evaluation method may be used to evaluate the distribution of X-ray intensity. In this case, the value of the moving average interval may be set to a value between 2 and 4.

[0041] In this case, it is possible to reduce slippage of crystal planes in a specific direction in the coating layer 3, thereby reducing plastic deformation of the coating layer 3. Accordingly, it is possible to increase the hardness of the coating layer 3 and the Young's modulus of the coating layer 3. It is also possible to increase the resistance of the coating layer 3 to plastic deformation. Furthermore, it is possible to improve the durability of the coating layer 3 against impacts and / or abrasion in various directions, thereby improving the wear resistance of the coating layer 3. Accordingly, it is possible to improve the wear resistance of the coated tool 1 including the coating layer 3. As a result, it is possible to increase the service life of the coated tool 1 including the coating layer 3.

[0042] In this embodiment, the minimum value of the X-ray intensity for the (200) plane of the cubic crystal contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 45° to 90° is 0.2 times or more the maximum value of the X-ray intensity for the (200) plane of the cubic crystal contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 45° to 90°.

[0043] In Fig. 6, I(200, 45°) indicates the intensity of X-rays associated with the (200) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 45°. In Fig. 6, I(200, 90°) indicates the intensity of X-rays associated with the (200) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 90°.

[0044] As described above, the intensity of X-rays associated with the (200) plane of the cubic crystals contained in the coating layer 3 monotonically increases within the range of the tilt angle α of the coating layer 3 from 0° to 90°. Therefore, the minimum value of the intensity of X-rays associated with the (200) plane of the cubic crystals contained in the coating layer 3 within the range of the tilt angle α of the coating layer 3 from 45° to 90° includes I(200, 45°). The maximum value of the intensity of X-rays associated with the (200) plane of the cubic crystals contained in the coating layer 3 within the range of the tilt angle α of the coating layer 3 from 45° to 90° includes I(200, 90°). Therefore, I(200, 45°) is 0.2 times or more of I(200, 90°).

[0045] In this case, it is possible to reduce the bias in the orientation of the (200) plane of the cubic crystals contained in the coating layer 3 in a specific direction. Accordingly, the cubic crystals contained in the coating layer 3 can have various orientations. As a result, it is possible to reduce abnormal wear of the coating layer 3. Accordingly, it is possible to improve the wear resistance of the coated tool 1 including the coating layer 3.

[0046] In this embodiment, the minimum value of the X-ray intensity for the (111) plane of the cubic crystal contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 30° to 90° is 0.8 times or more the maximum value of the X-ray intensity for the (111) plane of the cubic crystal contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 30° to 90°.

[0047] In Fig. 5, I(111, 30°) indicates the intensity of X-rays associated with the (111) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 30°. In Fig. 5, I(111, 90°) indicates the intensity of X-rays associated with the (111) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 90°.

[0048] As described above, the intensity of X-rays associated with the (111) plane of the cubic crystals contained in the coating layer 3 monotonically increases within the range of the tilt angle α of the coating layer 3 from 0° to 90°. Therefore, the minimum value of the intensity of X-rays associated with the (111) plane of the cubic crystals contained in the coating layer 3 within the range of the tilt angle α of the coating layer 3 from 30° to 90° includes I(111,30°). The maximum value of the intensity of X-rays associated with the (111) plane of the cubic crystals contained in the coating layer 3 within the range of the tilt angle α of the coating layer 3 from 30° to 90° includes I(111,90°). Therefore, I(111,30°) is 0.8 times or more of I(111,90°).

[0049] In this case, it is possible to orient the (111) plane of the cubic crystals contained in the coating layer 3 in various directions. Accordingly, the coating layer 3 can have a homogeneous structure in which the bias of the (111) plane of the cubic crystals contained in the coating layer 3 in a specific direction is reduced. As a result, it is possible to reduce abnormal damage to the coating layer 3, such as chipping and / or fracture of the coating layer 3, due to impacts to the coating layer 3 in various directions. Accordingly, it is possible to improve the wear resistance of the coated tool 1 including the coating layer 3.

[0050] In this embodiment, the ratio of the X-ray intensity associated with the (111) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 45° to the maximum X-ray intensity associated with the (111) plane of the cubic crystals contained in the coating layer 3 in the range of tilt angle α of the coating layer 3 from 0° to 90° is greater than the ratio of the X-ray intensity associated with the (200) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 45° to the maximum X-ray intensity associated with the (200) plane of the cubic crystals contained in the coating layer 3 in the range of tilt angle α of the coating layer 3 from 0° to 90°.

[0051] In FIG. 5, I(111, 45°) indicates the intensity of X-rays relating to the (111) plane of the cubic crystal contained in the coating layer 3 at a tilt angle α of 45°.

[0052] As described above, the intensity of X-rays associated with the (111) plane of the cubic crystals contained in the coating layer 3 monotonically increases within the range of the tilt angle α of the coating layer 3 from 0° to 90°. Therefore, the maximum value of the intensity of X-rays associated with the (111) plane of the cubic crystals contained in the coating layer 3 within the range of the tilt angle α of the coating layer 3 from 0° to 90° includes I(111, 90°).

[0053] As described above, the intensity of X-rays associated with the (200) plane of the cubic crystals contained in the coating layer 3 monotonically increases within the range of the tilt angle α of the coating layer 3 from 0° to 90°. Therefore, the maximum value of the intensity of X-rays associated with the (200) plane of the cubic crystals contained in the coating layer 3 within the range of the tilt angle α of the coating layer 3 from 0° to 90° includes I(200, 90°).

[0054] Therefore, I(111, 45°) / I(111, 90°) is greater than I(200, 45°) / I(200, 90°).

[0055] In this embodiment, the ratio of the X-ray intensity associated with the (111) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 45° to the maximum X-ray intensity associated with the (111) plane of the cubic crystals contained in the coating layer 3 in the range of tilt angle α of the coating layer 3 from 0° to 90°, and the ratio of the X-ray intensity associated with the (200) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 45° to the maximum X-ray intensity associated with the (200) plane of the cubic crystals contained in the coating layer 3 in the range of tilt angle α of the coating layer 3 from 0° to 90° are both 0.5 or more.

[0056] That is, both I(111, 45°) / I(111, 90°) and I(200, 45°) / I(200, 90°) are 0.5 or more.

[0057] In this embodiment, the ratio of the minimum X-ray intensity associated with the (200) plane of the cubic crystals contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 0° to 90° to the maximum X-ray intensity associated with the (200) plane of the cubic crystals contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 0° to 90° is greater than the ratio of the minimum X-ray intensity associated with the (111) plane of the cubic crystals contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 0° to 90° to the maximum X-ray intensity associated with the (111) plane of the cubic crystals contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 0° to 90°.

[0058] In Fig. 5, I(111, 0°) indicates the intensity of X-rays associated with the (111) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 0°. In Fig. 6, I(200, 0°) indicates the intensity of X-rays associated with the (200) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 0°.

[0059] As described above, the intensity of X-rays associated with the (111) plane of the cubic crystals contained in the coating layer 3 monotonically increases within the range of the tilt angle α of the coating layer 3 from 0° to 90°. Therefore, the minimum value of the intensity of X-rays associated with the (111) plane of the cubic crystals contained in the coating layer 3 within the range of the tilt angle α of the coating layer 3 from 0° to 90° includes I(111, 0°).

[0060] As described above, the intensity of X-rays associated with the (200) plane of the cubic crystals contained in the coating layer 3 monotonically increases within the range of the tilt angle α of the coating layer 3 from 0° to 90°. Therefore, the minimum value of the intensity of X-rays associated with the (200) plane of the cubic crystals contained in the coating layer 3 within the range of the tilt angle α of the coating layer 3 from 0° to 90° includes I(200,0°).

[0061] Therefore, I(200,0°) / I(200,90°) is greater than I(111,0°) / I(111,90°).

[0062] In this embodiment, the ratio of the minimum X-ray intensity associated with the (200) plane of the cubic crystals contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 0° to 90° to the maximum X-ray intensity associated with the (200) plane of the cubic crystals contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 0° to 90°, and the ratio of the minimum X-ray intensity associated with the (111) plane of the cubic crystals contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 0° to 90° to the maximum X-ray intensity associated with the (111) plane of the cubic crystals contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 0° to 90° are both 0.1 or more.

[0063] That is, both I(200,0°) / I(200,90°) and I(111,0°) / I(111,90°) are 0.1 or greater.

[0064] <Method for manufacturing coated tool> Next, an example of a method for manufacturing the coated tool 1 according to this embodiment will be described. The method for manufacturing the coated tool 1 according to this embodiment is not limited to the following manufacturing method.

[0065] The coated tool 1 is manufactured by forming at least one coating layer 3 on a substrate 2. The coating layer 3 may be formed by, for example, a physical vapor deposition (PVD) method. For example, when the coating layer 3 is formed by physical vapor deposition while the substrate 2 is held on the inner circumferential surface of the through hole 15, the coating layer 3 can be formed so as to cover the entire surface of the substrate 2 except for the inner circumferential surface of the through hole 15.

[0066] Examples of physical vapor deposition methods include ion plating methods such as arc ion plating (AIP) and sputtering. The arc ion plating method uses arc discharge in a vacuum atmosphere to evaporate target elements, and nitrogen (N ２ ) gas, etc. to form a film of the target element or a nitride of the target element.

[0067] For example, when the coating layer 3 is formed on the substrate 2 by arc ion plating, the coated tool 1 can be produced by the following method.

[0068] As an example, a target of each of the elements Ti, Al, and M, a target of composite elements, or a sintered target is prepared, where M is at least one element selected from Groups 4, 5, and 6 (excluding Cr) of the periodic table of elements, and Si.

[0069] Next, the target, which is the source of the element, is evaporated and ionized by arc discharge or glow discharge. The ionized element is, for example, nitrogen (N ２ ) gas and is deposited on the surface of the substrate 2. This makes it possible to form a coating layer 3 on the substrate 2.

[0070] Here, in order for the X-ray diffraction pole figure for the coating layer 3 to have the X-ray intensity for the (111) plane of the cubic crystal and the X-ray intensity for the (200) plane of the cubic crystal each monotonically increase within the range of the tilt angle α of the coating layer 3 from 0° to 90°, it is possible to consider, for example, increasing the plasma density and plasma energy of the ionized elements and periodically varying the gas pressure of nitrogen gas or the like. Examples of methods for increasing the plasma density and plasma energy of the ionized elements include: - setting the temperature of the substrate 2 to a temperature in the range of 550°C to 600°C, - setting the distance between the target and the substrate 2 to a distance in the range of 50mm to 200mm, - setting the bias voltage applied to the substrate 2 to a voltage in the range of 50V to 100V, - forming a magnetic field linearly in the target direction, - setting the distance between the cathodes to a distance in the range of 100mm to 200mm, - setting the magnetic flux density of the magnet to a magnetic flux density in the range of 20mT to 80mT, etc. Regarding the gas pressure of nitrogen gas or the like, examples include periodically varying it within a range of 2Pa to 8Pa.

[0071] <Cutting Tool> Next, a cutting tool including the above-described coated tool 1 will be described with reference to Fig. 7. Fig. 7 is a front view showing an example of a cutting tool according to this embodiment.

[0072] As shown in FIG. 7, a cutting tool 100 according to this embodiment includes a coated tool 1 and a holder 70 for fixing the coated tool 1 .

[0073] The holder 70 is a rod-shaped member extending from a first end (the upper end in FIG. 7 ) to a second end (the lower end in FIG. 7 ). The holder 70 is made of, for example, steel or cast iron. Of these materials, steel may be used, as it has high toughness.

[0074] The holder 70 has a pocket 73 at the end on the first end side. The pocket 73 is a portion where the coated tool 1 is attached, and has a seating surface that intersects with the rotation direction of the workpiece and a constraint side surface that is inclined relative to the seating surface. The seating surface is provided with a screw hole into which a screw 75, which will be described later, is threaded.

[0075] The coated tool 1 is positioned in a pocket 73 of the holder 70 and attached to the holder 70 by a screw 75. That is, the screw 75 is inserted into the through hole 5 of the coated tool 1, and the tip of the screw 75 is inserted into a threaded hole formed in the seating surface of the pocket 73 to screw the threaded portions together. In this way, the coated tool 1 is attached to the holder 70 so that the cutting edge portion protrudes outward from the holder 70.

[0076] In this embodiment, a cutting tool 100 used for so-called turning is illustrated. 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 coated tool 1 may be used as a cutting tool used for milling. Examples of cutting tools used for milling include milling cutters such as flat milling cutters, face milling cutters, side milling cutters, and groove milling cutters, and end mills such as single-blade end mills, multi-blade end mills, tapered-blade end mills, and ball end mills.

[0077] Turning is performed using a lathe. Turning includes the steps of rotating a workpiece, bringing a fixed cutting tool 100 into contact with the rotating workpiece to remove the surface of the rotating workpiece, and removing the cutting tool 100 from the workpiece. By machining the workpiece into a desired rotationally symmetric shape in this manner, it is possible to manufacture a rotationally symmetric machined product. Turning is performed using a milling machine. Turning includes the steps of rotating the cutting tool 100, bringing the rotating cutting tool 100 into contact with the fixed workpiece to remove the fixed workpiece, and removing the cutting tool 100 from the workpiece. By machining the workpiece into a desired shape in this manner, it is possible to manufacture a machined product.

[0078] In this embodiment, an example is shown in which the shapes of the upper and lower surfaces of the cutting tool 100 are parallelograms. The shapes of the upper and lower surfaces of the cutting tool 100 may be rhombic, square, etc. The shapes of the upper and lower surfaces of the cutting tool 100 may be triangular, pentagonal, hexagonal, etc. The shape of the cutting tool 100 may be a positive type or a negative type. A positive type is a type in which the side surfaces are inclined with respect to a central axis passing through the centers of the upper and lower surfaces of the cutting tool 100, and a negative type is a type in which the side surfaces are parallel to the central axis.

[0079] <Method of manufacturing machined product> Next, a method of manufacturing a machined product according to an embodiment will be described with reference to Figures 8A, 8B, and 8C. Figures 8A, 8B, and 8C are schematic views showing a step of the method of manufacturing a machined product according to an embodiment.

[0080] The machined product 200 is produced by cutting a workpiece 201. 8A, 8B, and 8C illustrate turning using a lathe as an example of cutting. The manufacturing method of the machined product 200 in this embodiment includes: a step (step A) of rotating the workpiece 201; a step (step B) of bringing the workpiece 201 into contact with the cutting tool 100; and a step (step C) of moving the cutting tool 100 relatively away from the workpiece 201.

[0081] More specifically, first, as shown in Fig. 8A, the workpiece 201 is rotated around the axis O1, and the cutting tool 100 is brought relatively close to the workpiece 201. Next, as shown in Fig. 8B, the cutting edge of the coated tool 1 is brought into contact with the workpiece 201 to cut the workpiece 201. Next, as shown in Fig. 8C, the cutting tool 100 is moved relatively away from the workpiece 201.

[0082] In Fig. 8A, the axis O1 is fixed and the workpiece 201 is rotated while the cutting tool 100 is moved in the Y1 direction to approach the workpiece 201. In Fig. 8B, the cutting edge of the coated tool 1 is brought into contact with the rotating workpiece 201 to cut the workpiece 201. In Fig. 8C, the cutting tool 100 is moved in the Y2 direction while the workpiece 201 is rotated to move away from the workpiece 201.

[0083] In the cutting process in the manufacturing method of the machined product according to the embodiment, the cutting tool 100 is moved in each step to bring the cutting tool 100 into contact with the workpiece 201 or to move the cutting tool 100 away from the workpiece 201. However, the manufacturing method of the machined product is not limited to this mode, as a matter of course.

[0084] For example, in step A, the workpiece 201 may be brought closer to the cutting tool 100. Similarly, in step C, the workpiece 201 may be moved away from the cutting tool 100. To continue the cutting process, the workpiece 201 may be kept rotating, and the step of bringing the cutting edge of the cutting tool 100 into contact with different locations on the workpiece 201 may be repeated.

[0085] When performing milling instead of turning, the cutting tool may be rotated around a rotation axis in step A. Furthermore, in step B, the workpiece 201 may be cut by bringing the cutting edge of the rotating coated tool 1 into contact with the workpiece 201. Furthermore, in step C, the cutting tool may be moved away from the workpiece 201. The milling may be performed using a milling machine.

[0086] Typical examples of the material of the workpiece 201 include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0087] Examples of the present disclosure will be specifically described below, but the present disclosure is not limited to the examples shown below.

[0088] (Example) First, a coating layer was formed on a substrate by arc ion plating, producing a coated tool including the substrate and the coating layer located thereon. Here, a WC-based cemented carbide was used as the substrate. The coating layer was formed on the substrate under the following conditions. Table 1 shows the arc ion plating conditions for forming the coating layer on the substrate. Substrate temperature: 550°C to 600°C. Target composition: as shown in Table 1. Gas pressure: varied within a range of 2 to 8 Pa at the cycle shown in Table 1. Distance between target and substrate (T-S distance): 50 to 200 mm (shown in Table 1). Bias voltage: 65 V (shown in Table 1). Magnetic field distribution: Cathode distance: 100 to 200 mm (shown in Table 1). Magnet magnetic force: 20 to 80 mT (shown in Table 1). The deposition time was adjusted so that the coating layer formed on the substrate had a thickness of 2 μm. The average composition of the coating layer formed on the substrate was the composition shown in Table 1.

[0089] Next, a thin film X-ray diffraction pole figure measurement was performed on the coated tool manufactured as an example using a thin film X-ray diffraction apparatus under the following conditions: Apparatus: PANalytical X'Pert PRO-MRD (DY1878); Tube: CuKα; Voltage: 45 kV; Current: 40 mA; Collimator: Flat collimator; Measurement surface: Surfaces corresponding to the (111) and (200) planes of the coating layer (PVD film); Measurement conditions: φ-θ scan; Step / time: 2.5° / 0.5 sec; Scanning method: Concentric circles; Fixed θ angle: The diffraction angle 2θ for the plane corresponding to the (111) plane was set to the angle at which the diffracted X-ray intensity was highest in the range from 35° to 38°. The diffraction angle 2θ for the plane corresponding to the (200) plane was set to the angle at which the diffracted X-ray intensity was highest in the range from 42° to 44°. Scanning range of tilt angle α: 0° to 90° in 2.5° steps *When the normal to the surface of the coating layer is parallel to the plane of incidence of the X-rays, the tilt angle α is considered to be 90°. Scanning range of in-plane rotation angle β: 0° to 360° in 2.5° steps

[0090] As a result, X-ray diffraction pole figures for the (111) and (200) planes of the cubic crystals contained in the coating layer of the coated tool manufactured as an example were obtained, and the centers of the obtained pole figures corresponded to a tilt angle α of 90°.

[0091] Next, from the obtained pole figures, the distribution of X-ray intensity for the (111) and (200) planes of the cubic crystals contained in the coating layer of the coated tool fabricated as an example was calculated. Specifically, for each tilt angle α in 2.5° steps, the average value of the measured X-ray intensity for the in-plane rotation angle β was calculated to calculate the X-ray intensity at each tilt angle α. Next, a fourth-order polynomial approximation was performed on the calculated X-ray intensity for each tilt angle α to obtain a fourth-order polynomial approximation curve showing the distribution of X-ray intensity for the tilt angle α.

[0092] In this way, a fourth-order polynomial approximation curve was obtained, showing the distribution of X-ray intensity for the (111) plane and (200) plane of the cubic crystals contained in the coating layer of the coated tool produced as an example. Fig. 9 is a diagram showing the distribution of X-ray intensity for the (111) plane of the cubic crystals contained in the coating layer of Example Sample No. 1. Fig. 10 is a diagram showing the distribution of X-ray intensity for the (200) plane of the cubic crystals contained in the coating layer of Example Sample No. 1. In Figs. 9 and 10, the horizontal axis represents the tilt angle α (°), and the vertical axis represents the X-ray intensity (counts).

[0093] 9 , it was confirmed that the fourth-order polynomial approximation curve showing the distribution of X-ray intensity for the (111) plane of the cubic crystals contained in the coating layer of Example Sample No. 1 had neither a maximum value nor a minimum value. That is, it was confirmed that the X-ray intensity for the (111) plane of the cubic crystals contained in the coating layer of Example Sample No. 1 monotonically increased in the tilt angle range of the coating layer from 0° to 90°.

[0094] 10 , it was confirmed that the fourth-order polynomial approximation curve showing the distribution of X-ray intensity for the (200) plane of the cubic crystals contained in the coating layer of Example Sample No. 1 had neither a maximum value nor a minimum value. That is, it was confirmed that the X-ray intensity for the (200) plane of the cubic crystals contained in the coating layer of Example Sample No. 1 monotonically increased in the tilt angle range of the coating layer from 0° to 90°.

[0095] As shown in FIG. 10 , it was confirmed that the minimum value (175) of the X-ray intensity for the (200) plane of the cubic crystal in the tilt angle range of the coating layer from 45° to 90° was 0.2 times or more the maximum value (322) of the X-ray intensity for the (200) plane of the cubic crystal in the tilt angle range of the coating layer from 45° to 90°.

[0096] As shown in FIG. 9 , it was confirmed that the minimum value (222) of the X-ray intensity for the (111) plane of the cubic crystal in the tilt angle range of the coating layer from 30° to 90° was 0.8 times or more the maximum value (274) of the X-ray intensity for the (111) plane of the cubic crystal in the tilt angle range of the coating layer from 30° to 90°.

[0097] As shown in Figures 9 and 10 , it was confirmed that the ratio (0.89) of the X-ray intensity (243) associated with the (111) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 45° to the maximum X-ray intensity (274) associated with the (111) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 45° to the maximum X-ray intensity (322) associated with the (200) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 45° to the maximum X-ray intensity (175) associated with the (200) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 45° to the maximum X-ray intensity (200) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 0° to 90°.

[0098] As shown in Figures 9 and 10, it was confirmed that the ratio (0.89) of the X-ray intensity (243) associated with the (111) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 45° to the maximum X-ray intensity (274) associated with the (111) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 45° to the maximum X-ray intensity (322) associated with the (200) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 45° to the maximum X-ray intensity (175) associated with the (200) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 45° to the maximum X-ray intensity (322) associated with the (200) plane of the cubic crystals contained in the coating layer 3 at a tilt angle α of 0° to 90° was 0.5 or more.

[0099] As shown in Figures 9 and 10 , it was confirmed that the ratio (0.16) of the minimum X-ray intensity (50) associated with the (200) plane of the cubic crystals contained in the coating layer 3 within the range of the tilt angle α of the coating layer 3 from 0° to 90° to the maximum X-ray intensity (322) associated with the (200) plane of the cubic crystals contained in the coating layer 3 within the range of the tilt angle α of the coating layer 3 from 0° to 90° is greater than the ratio (0.11) of the minimum X-ray intensity (30) associated with the (111) plane of the cubic crystals contained in the coating layer 3 within the range of the tilt angle α of the coating layer 3 from 0° to 90° to the maximum X-ray intensity (274) associated with the (111) plane of the cubic crystals contained in the coating layer 3 within the range of the tilt angle α of the coating layer 3 from 0° to 90°.

[0100] As shown in Figures 9 and 10 , it was confirmed that the ratio (0.16) of the minimum X-ray intensity (50) for the (200) plane of the cubic crystals contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 0° to 90° to the maximum X-ray intensity (322) for the (200) plane of the cubic crystals contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 0° to 90°, and the ratio (0.11) of the minimum X-ray intensity (30) for the (111) plane of the cubic crystals contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 0° to 90° to the maximum X-ray intensity (274) for the (111) plane of the cubic crystals contained in the coating layer 3 in the range of the tilt angle α of the coating layer 3 from 0° to 90° were both 0.1 or more.

[0101] Among the examples, in at least Samples No. 1 to No. 6, the coated tool included a substrate and at least one coating layer located on the substrate, the coating layer including cubic crystals containing at least one element selected from among elements of Groups 4, 5, and 6 of the periodic table, Al, and Si, and at least one element selected from among C and N, and it was confirmed that, in an X-ray diffraction pole figure for the coating layer, the X-ray intensity for the (111) plane of the cubic crystals and the X-ray intensity for the (200) plane of the cubic crystals each monotonically increased within the tilt angle range of the coating layer from 0° to 90°.

[0102] Among the Examples, at least in Samples Nos. 1, 2, 4, and 5, it was confirmed that, in the X-ray diffraction pole figures for the coating layer, the minimum value of the X-ray intensity for the (200) plane of the cubic crystal in the tilt angle range of the coating layer from 45° to 90° was 0.2 times or more the maximum value of the X-ray intensity for the (200) plane of the cubic crystal in the tilt angle range of the coating layer from 45° to 90°.

[0103] Among the Examples, at least in Samples No. 1 and 4, it was confirmed that, in the X-ray diffraction pole figures for the coating layer, the minimum value of the X-ray intensity for the (111) plane of the cubic crystal in the tilt angle range of the coating layer from 30° to 90° was 0.8 times or more the maximum value of the X-ray intensity for the (111) plane of the cubic crystal in the tilt angle range of the coating layer from 30° to 90°.

[0104] Similarly, X-ray diffraction pole figures were measured for the coating layer of a conventional coated tool as a comparative example, and X-ray diffraction pole figures for the (111) and (200) planes of the cubic crystals contained in the coating layer were obtained. From the obtained pole figures, a fourth-order polynomial approximation curve showing the distribution of X-ray intensity for the (111) and (200) planes of the cubic crystals contained in the coating layer of the comparative coated tool was similarly obtained.

[0105] Fig. 11 is a diagram showing the distribution of X-ray intensity for the (111) plane of the cubic crystals contained in the coating layer of comparative sample No. 7. Fig. 12 is a diagram showing the distribution of X-ray intensity for the (200) plane of the cubic crystals contained in the coating layer of comparative sample No. 7. In Figs. 11 and 12, the horizontal axis represents the tilt angle α (°), and the vertical axis represents the X-ray intensity (counts).

[0106] 11 , it was confirmed that the fourth-order polynomial approximation curve showing the distribution of X-ray intensity for the (111) plane of the cubic crystals contained in the coating layer of Comparative Example Sample No. 7 has neither a maximum value nor a minimum value. That is, it was confirmed that the X-ray intensity for the (111) plane of the cubic crystals contained in the coating layer of Comparative Example increases monotonically in the tilt angle range of the coating layer from 0° to 90°.

[0107] 12 , it was confirmed that the fourth-order polynomial approximation curve showing the distribution of X-ray intensity for the (200) plane of the cubic crystals contained in the coating layer of Comparative Example Sample No. 7 has a maximum value and a minimum value. That is, it was confirmed that the X-ray intensity for the (200) plane of the cubic crystals contained in the coating layer of Comparative Example does not monotonically increase within the tilt angle range of the coating layer from 0° to 90°.

[0108] Next, cutting tests were conducted on the coated tools of the example and the comparative example. The cutting test conditions are shown below. Cutting conditions: Workpiece material: S45C Cutting speed: Vc = 170 m / min (low speed) and 250 m / min (high speed) Feed: f = 0.1 mm / rev Depth of cut: ae = 1.5 mm Cutting state: Wet Cutting tool shape: GBA43R300-030GM Evaluation method: Turning was performed for 120 minutes under the above conditions, and the wear width of the front flank after cutting was measured.

[0109] Table 2 shows the results of cutting tests on the coated tools according to Example Samples No. 1 to No. 6 and Comparative Example Samples No. 7 to No. 9. More specifically, Table 2 shows the wear width (mm) of the leading flank of the coated tools when low-speed and high-speed cutting was performed under the above-mentioned cutting conditions.

[0110] As shown in Table 2, the wear width of the front flank of the coated tools according to Samples No. 1 to No. 6 of the Examples was smaller than the wear width of the front flank of the coated tools according to Samples No. 7 to No. 9 of the Comparative Examples, in both low-speed cutting and high-speed cutting. Thus, it was confirmed that the wear resistance and fracture resistance of the coated tools according to Samples No. 1 to No. 6 of the Examples were improved compared to the coated tools according to Samples No. 7 to No. 9 of the Comparative Examples.

[0111] The present technology can be configured as follows: (1) A coated tool comprising: a substrate; and at least one coating layer located on the substrate, wherein the coating layer includes cubic crystals containing at least one element selected from elements of Groups 4, 5, and 6 of the periodic table, Al, and Si, and at least one element selected from C and N, and in an X-ray diffraction pole figure for the coating layer, the intensity of X-rays associated with a (111) plane of the cubic crystals and the intensity of X-rays associated with a (200) plane of the cubic crystals each monotonically increase in the range of tilt angle of the coating layer from 0° to 90°. (2) The coated tool according to (1) above, wherein, in an X-ray diffraction pole figure for the coating layer, the minimum value of the X-ray intensity for the (200) plane of the cubic crystal in the tilt angle range of the coating layer from 45° to 90° is 0.2 times or more of the maximum value of the X-ray intensity for the (200) plane of the cubic crystal in the tilt angle range of the coating layer from 45° to 90°. (3) The coated tool according to (1) or (2) above, wherein, in an X-ray diffraction pole figure for the coating layer, the minimum value of the X-ray intensity for the (111) plane of the cubic crystal in the tilt angle range of the coating layer from 30° to 90° is 0.8 times or more of the maximum value of the X-ray intensity for the (111) plane of the cubic crystal in the tilt angle range of the coating layer from 30° to 90°. (4) A cutting tool comprising: a rod-shaped holder having a pocket at an end thereof; and the coated tool according to any one of (1) to (3) positioned in the pocket. (5) A method for manufacturing a machined product comprising the steps of: rotating a workpiece or the cutting tool according to (4), bringing the workpiece and the cutting tool into contact with each other, and moving the cutting tool relatively away from the workpiece.

[0112] Further advantages and / or modifications may readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

[0113] REFERENCE SIGNS LIST 1 coated tool 11 insert 15 through hole 2 substrate 3 coating layer 31 stage 32 X-ray source 33 X-ray detector 70 holder 73 pocket 75 screw 100 cutting tool

Claims

1. A coated tool comprising: a substrate; and at least one coating layer positioned on the substrate, wherein the coating layer comprises cubic crystals containing at least one element selected from among elements of Groups 4, 5, and 6 of the periodic table, Al, and Si, and at least one element selected from among C and N, and wherein, in an X-ray diffraction pole figure for the coating layer, the intensity of X-rays associated with the (111) plane of the cubic crystals and the intensity of X-rays associated with the (200) plane of the cubic crystals each monotonically increase within the range of tilt angle of the coating layer from 0° to 90°.

2. The coated tool according to claim 1, wherein, in an X-ray diffraction pole figure of the coating layer, the minimum value of the X-ray intensity associated with the (200) plane of the cubic crystal in the tilt angle range of the coating layer from 45° to 90° is 0.2 times or more the maximum value of the X-ray intensity associated with the (200) plane of the cubic crystal in the tilt angle range of the coating layer from 45° to 90°.

3. The coated tool according to claim 1 or 2, wherein, in an X-ray diffraction pole figure for the coating layer, the minimum value of the X-ray intensity for the (111) plane of the cubic crystal in the tilt angle range of the coating layer from 30° to 90° is 0.8 times or more the maximum value of the X-ray intensity for the (111) plane of the cubic crystal in the tilt angle range of the coating layer from 30° to 90°.

4. A cutting tool comprising: a rod-shaped holder having a pocket at an end thereof; and the coated tool according to any one of claims 1 to 3 positioned in said pocket.

5. A method for manufacturing a machined product, comprising the steps of: rotating a workpiece or the cutting tool described in claim 4; bringing the workpiece and the cutting tool into contact; and moving the cutting tool relatively away from the workpiece.

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