Blade and cutting tool

Abstract

The blade (1) of the present application has a cBN-based sintered body containing cBN and TiN. In cross-sectional observation of the cBN-based sintered body, cBN accounts for 60% or more of the area. Further, when the X-ray intensity of the (111) crystal plane of cBN in X-ray diffraction of the cBN-based sintered body is cBN(111), and the X-ray intensity of the (200) crystal plane of TiN in X-ray diffraction of the cBN-based sintered body is TiN(200), TiN(200) is greater than the cBN(111).

Description

TECHNICAL FIELD

[0001] The present application relates to a blade and a cutting tool. BACKGROUND

[0002] Cubic boron nitride (cBN) has a hardness second only to diamond and excellent chemical stability. Therefore, cBN sintered bodies are widely used as cutting tools for machining iron-based metals such as quenched steel, cast iron, or sintered alloy.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-172477 SUMMARY

[0006] A blade of one embodiment of the present application has a cBN sintered body containing cBN and TiN. In cross-sectional observation of the cBN sintered body, cBN accounts for 60% or more of the area. Further, when the X-ray intensity of the (111) crystal plane of cBN in X-ray diffraction of the cBN sintered body is cBN(111), and the X-ray intensity of the (200) crystal plane of TiN in X-ray diffraction of the cBN sintered body is TiN(200), TiN(200) is greater than cBN(111). BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 FIG. 1 is a perspective view of an example of a blade of an embodiment.

[0008] Figure 2 FIG. 2 is a side cross-sectional view of the example of the blade of the embodiment.

[0009] Figure 3 FIG. 3 is a front view of an example of a cutting tool of the embodiment.

[0010] Figure 4 FIG. 4 is a table summarizing the results of expressing the height of the peak intensity of XRD measurement by the count of a per 1 second scintillation counter.

[0011] Figure 5 FIG. 5 is a graph showing the results of XRD measurement of Sample No. 1.

[0012] Figure 6 FIG. 6 is a graph showing the results of XRD measurement of Sample No. 3.

[0013] Figure 7 FIG. 7 is a table summarizing the evaluation results of wear resistance and stability with respect to each sample. DETAILED DESCRIPTION

[0014] Hereinafter, a manner of implementing the insert and the cutting tool according to the present application (hereinafter, referred to as "embodiment") will be described in detail with reference to the drawings. Also, the insert and the cutting tool according to the present application are not limited to this embodiment. In addition, each embodiment can be appropriately combined within a range not contradictory to the content. In addition, in each of the embodiments described below, the same reference numerals are attached to the same parts, and repeated description is omitted.

[0015] In addition, in the embodiments shown below, expressions such as "certain", "orthogonal", "perpendicular", or "parallel" are sometimes used, but these expressions do not need to be strictly "certain", "orthogonal", "perpendicular", or "parallel". That is, each of the above expressions allows, for example, a deviation in manufacturing accuracy, setting accuracy, and the like.

[0016] The present application provides a technology capable of improving the chipping resistance in an insert having a cBN sintered body.

[0017] <INSERT>

[0018] Figure 1 is a perspective view showing an example of the insert according to the embodiment. As shown in Figure 1 , the insert 1 according to the embodiment is an insert for a cutting tool, for example, has a shape of a hexahedron of a parallelepiped in which upper and lower surfaces (surfaces intersecting the Z axis shown in Figure 1 ) are parallel.

[0019] The insert 1 according to the embodiment has a main body portion 2, and a base 10 mounted to the main body portion 2 via a joining material 40 (refer to Figure 2 ) to be described later.

[0020] The main body portion 2 is formed of, for example, cemented carbide. The cemented carbide contains W (tungsten), specifically, WC (tungsten carbide). In addition, the cemented carbide can contain Ni (nickel) and Co (cobalt). In addition, the main body portion 2 can be formed of cermet. The cermet contains, for example, Ti (titanium), specifically, TiC (titanium carbide) or TiN (titanium nitride). In addition, the cermet can contain Ni and Co.

[0021] A support surface 4 for mounting the base 10 is provided at an end portion of the main body portion 2. In addition, a through-hole 5 that penetrates the main body portion 2 upward and downward is provided at a central portion of the main body portion 2. In the through-hole 5, a bolt 75 (refer to Figure 3 ) for mounting the insert 1 to a shank 70 to be described later is inserted.

[0022] The base 10 is mounted to the support surface 4 of the main body portion 2. Thereby, the base 10 and the main body portion 2 are integrated.

[0023] The base 10 has a first face 6 (here, an upper face) and a second face 7 (here, a side face) connected to the first face 6. In the embodiment, the first face 6 functions as a "rake face" that scrapes chips generated by cutting, and the second face 7 functions as a "flank face". An edge 8 is provided on at least a part of an edge line where the first face 6 and the second face 7 intersect, and the insert 1 cuts a workpiece by bringing such an edge 8 into contact with the workpiece.

[0024] The base 10 is a cubic boron nitride (cBN) sintered body (hereinafter, referred to as "cBN sintered body"), and a plurality of cBN particles are bonded via a binder phase. The detailed structure of the base 10 will be described later.

[0025] Figure 2 is a side sectional view showing an example of the insert 1 according to the embodiment. As shown in Figure 2 , on the lower face of the base 10, a substrate 30 formed of, for example, cemented carbide or cermet can be provided. In this case, the base 10 is joined to the support face 4 of the main body portion 2 via the substrate 30 and a joining material 40. The joining material 40 is, for example, a brazing material. Also, the base 10 can be joined to the main body portion 2 via the joining material 40 at a portion other than the support face 4 of the main body portion 2.

[0026] Also, in the embodiment, only the base 10 that is a part of the insert 1 is composed of the cBN sintered body, but the entire insert can be composed of the cBN sintered body.

[0027] The base 10 can be covered with a coating layer 20. The coating layer 20 is, for example, provided on the base 10 for the purpose of improving the wear resistance, heat resistance, and the like of the base 10. In Figure 2 , the coating layer 20 covers the main body portion 2 and the base 10 as a whole. This is not restrictive, and the coating layer 20 can be provided at least on the base 10. Also, the coating layer 20 can be provided on the main body portion 2. When the coating layer 20 is provided on the upper face of the base 10, the wear resistance and heat resistance of the first face 6 (see Figure 1 ) are high. Also, when the coating layer 20 is provided on the side face of the base 10, the wear resistance and heat resistance of the second face 7 (see Figure 1 ) are high.

[0028] The coating layer 20 can have a metal layer and a hard layer. The metal layer is provided between the base 10 and the hard layer. The bonding property of the metal layer to the base 10 is higher than the bonding property of the metal layer to the hard layer. As a metal element having such a property, for example, Zr, V, Cr, W, Al, Si, Y can be listed. The metal layer contains at least one or more of the above metal elements.

[0029] The hard layer has excellent wear resistance compared to the metal layer. The hard layer can have one or more metal nitride layers. For example, the hard layer can have a structure in which a plurality of first metal nitride layers and a plurality of second metal nitride layers are alternately stacked. The first metal nitride layer is provided on the metal layer.

[0030] For example, the metal layer can contain Al and Cr. In this case, the first metal nitride layer can contain Al. Specifically, the first metal nitride layer can be an AlTiN layer containing AlTiN as a nitride of Al and Ti. In addition, the second metal nitride layer can be an AlCrN layer containing AlCrN as a nitride of Al and Cr.

[0031] Thus, by providing the first metal nitride layer containing the metal contained in the metal layer on the metal layer, the adhesion of the metal layer to the hard layer is high. Accordingly, since the hard layer is difficult to peel from the metal layer, the durability of the coating 20 is high.

[0032] The first metal nitride layer, i.e., the AlTiN layer, has excellent wear resistance in addition to the adhesion to the metal layer. In addition, the second metal nitride layer, i.e., the AlCrN layer, has excellent heat resistance and oxidation resistance. Thus, the coating 20 can control the properties of the hard layer, such as wear resistance and heat resistance, by including the first metal nitride layer and the second metal nitride layer having different compositions. As a result, the tool life of the insert 1 can be extended. For example, in the hard layer of the embodiment, the excellent heat resistance of AlCrN can be maintained, and the mechanical properties of the adhesion to the metal layer and the wear resistance can be improved.

[0033] <Specific structure of cBN sintered body>

[0034] In the cBN sintered body constituting the insert 10 of the embodiment, the area occupancy of the cBN particles in the cross section of the cBN sintered body is at least 60% or more. The area occupancy of the cBN particles 11 can further be 65% or more. The area occupancy of the cBN particles can be obtained, for example, by analyzing an SEM observation image of the cross section of the cBN sintered body. Also, the portion other than the cBN particles in the cBN sintered body is referred to as a binder phase.

[0035] In addition, the cBN sintered body of the embodiment contains TiN. The TiN is contained in the binder phase.

[0036] Here, let cBN (111) be the X-ray intensity of the (111) crystal plane of cBN in the X-ray diffraction of the cBN sintered body, and let TiN (200) be the X-ray intensity of the (200) crystal plane of TiN in the X-ray diffraction of the cBN sintered body. In the cBN sintered body of the embodiment, TiN (200) is greater than cBN (111).

[0037] The cBN sintered body having a large amount of TiN has excellent wear resistance. On the other hand, the cBN sintered body having a small amount of cBN has low hardness and strength. Therefore, there is a problem of low chipping resistance. The cBN sintered body of the embodiment has excellent balance between wear resistance and chipping resistance by containing TiN and cBN particles in amounts of more than certain amounts, respectively.

[0038] In addition, the cBN sintered body of the embodiment can contain AlN and Al2O3. AlN and Al2O3 are contained in the binder phase.

[0039] Here, let AlN (100) be the X-ray intensity of the (100) crystal plane of AlN in the X-ray diffraction of the cBN sintered body, and let Al2O3 (104) be the X-ray intensity of the (104) crystal plane of Al2O3 in the X-ray diffraction of the cBN sintered body. In the cBN sintered body of the embodiment, AlN (100) is greater than Al2O3 (104).

[0040] Al2O3 and AlN are particles containing Al. Al2O3 has high oxidation resistance. If the amount of Al2O3 is increased, there is a case where the strength of the cBN sintered body is decreased. The cBN sintered body having AlN has high strength. If the amount of AlN is increased, there is a case where the hardness of the cBN sintered body is decreased.

[0041] In the cBN sintered body, if AlN (100) is greater than Al2O3 (104), the balance between strength and hardness is excellent.

[0042] In addition, Al can be contained in the binder phase of the cBN sintered body in an amount of 0.5 atomic % or more and 3.0 atomic % or less. The cBN sintered body having such a composition contains sufficient amounts of AlN and Al2O3, and the balance between strength and hardness is excellent. The measurement of the Al content in the cBN sintered body can be performed by EDS (energy dispersive X-ray microanalyzer), WDS (wavelength dispersive X-ray microanalyzer), ICP (inductively coupled plasma emission spectrometry), or SIMS (secondary ion mass spectrometry) attached to SEM (scanning electron microscope) or TEM (transmission electron microscope).

[0043] In addition, the cBN sintered body of the embodiment can contain TiB2. TiB2 is contained in the binder phase.

[0044] Here, let TiB2(101) be the X-ray intensity of the (101) crystal plane of TiB2. In the cBN sintered body of the embodiment, TiB2(101) can be 0.25 times or more of cBN(111).

[0045] By making the content of TiB2 in the range satisfying the above condition, the binding force of the binder phase and the cBN particles is improved. Therefore, the cBN sintered body according to the embodiment is high in hardness and strength.

[0046] < Cutting tool >

[0047] Next, a structure of a cutting tool provided with the insert 1 will be described with reference to Figure 3 to FIG. 1. Figure 3 is a front view of an example of the cutting tool of the embodiment.

[0048] As shown in Figure 3 , the cutting tool 100 of the embodiment has the insert 1 and a shank 70 for fixing the insert 1.

[0049] The shank 70 is a rod-like member extending from a first end (an upper end in Figure 3 ) toward a second end (a lower end in Figure 3 ). The shank 70 is made of, for example, steel or cast iron. In particular, among these members, a steel having high toughness is preferably used.

[0050] The shank 70 has a clamping groove 73 at an end portion on the first end side. The clamping groove 73 is a portion in which the insert 1 is fitted, and has a support surface intersecting the rotation direction of a workpiece and a restriction side surface inclined with respect to the support surface. On the support surface, a bolt hole in which a bolt 75 to be described later is screwed is provided.

[0051] The insert 1 is located in the clamping groove 73 of the shank 70, and is fitted to the shank 70 by the bolt 75. That is, the bolt 75 is inserted into the through hole 5 of the insert 1, the front end of the bolt 75 is inserted into the bolt hole formed in the support surface of the clamping groove 73, and the bolt portions are screwed to each other. Thus, the insert 1 is fitted to the shank 70 in a manner in which the cutting edge 8 (see Figure 1 ) protrudes outward from the shank 70.

[0052] In the embodiment, a cutting tool for so-called turning processing is exemplified. As the turning processing, for example, internal diameter processing, external diameter processing, and grooving processing can be listed. Also, as the cutting tool, it is not limited to be used for turning processing. For example, the insert 1 can be used for a cutting tool used in milling processing.

[0053] Next, an example of a manufacturing method of the insert 1 of the embodiment will be described. Also, the manufacturing method of the insert 1 is not limited to the method shown below.

[0054] First, TiN raw material powder 72 to 82 vol%, Al raw material powder 13 to 23 vol%, and Al2O3 raw material powder 1 to 11 vol% are prepared. Then, an organic solvent is added to the prepared respective raw material powders. As the organic solvent, an alcohol such as acetone, isopropyl alcohol (IPA) or the like can be used. Thereafter, pulverization and mixing are performed for 20 to 24 hours using a ball mill. After the pulverization and mixing, the solvent is evaporated, thereby obtaining a first mixed powder.

[0055] Next, cBN powder having an average particle diameter of 2.5 to 4.5 μm is mixed with cBN powder having an average particle diameter of 0.5 to 1.5 μm at a ratio of 8 to 9 : 1 to 2 by volume. An organic solvent is further added. As the organic solvent, an alcohol such as acetone, IPA or the like can be used. Thereafter, pulverization and mixing are performed for 20 to 24 hours using a ball mill. After the pulverization and mixing, the solvent is evaporated, thereby obtaining a second mixed powder.

[0056] Next, the obtained first mixed powder and the second mixed powder are mixed at a ratio of 68 to 78 : 22 to 32 by volume. An organic solvent and an organic binder are added to the mixed powder. As the organic solvent, an alcohol such as acetone, IPA or the like can be used. In addition, as the organic binder, paraffin, an acrylic resin or the like can be used. Thereafter, pulverization and mixing are performed for 20 to 24 hours using a ball mill, and thereafter the organic solvent is evaporated, thereby obtaining a third mixed powder. Also, a dispersant can be added as necessary in the process using the ball mill.

[0057] Then, a shaped body is obtained by shaping the third mixed powder into a prescribed shape. Known methods such as a uniaxial press, a cold isostatic press (CIP) or the like can be used in the shaping. The shaped body is heated at a prescribed temperature in the range of 500 to 1000°C, and the organic binder is evaporated and removed.

[0058] Next, the shaped body is loaded into a superhigh pressure heating device, and heated at 4 to 6 GPa at 1200 to 1500°C for 15 to 30 minutes. Thereby, the cBN sintered body of the embodiment is obtained.

[0059] Example

[0060] Hereinafter, an example of the present application will be described, but the present application is not limited by the following example.

[0061] First, TiN raw material powder, Al raw material powder, and Al2O3 raw material powder are prepared. Then, the prepared respective raw material powders are mixed with acetone as a solvent at a prescribed ratio, and thereafter the solvent is evaporated, thereby obtaining a first mixed powder. In the mixing of the respective raw material powders, a ball mill is used. The pulverization and mixing time of the ball mill is 20 to 24 hours.

[0062] Next, the cBN powder having an average particle diameter of 3.5 μm and the cBN powder having an average particle diameter of 1.0 μm were mixed at a ratio of 9:1 by volume, and then mixed by adding acetone as a solvent, and then dried, thereby obtaining a second mixed powder. Thereafter, the first mixed powder and the second mixed powder obtained were mixed by ball milling with acetone as a solvent and an organic binder for 20 to 24 hours, and then, by evaporating the solvent, a third mixed powder was obtained. Then, the third mixed powder was shaped into a predetermined shape to obtain a shaped body. In order to remove the binder, the shaped body was heated at a predetermined temperature in the range of 500 to 1000°C. Also, a dispersant was added in the process using the ball mill.

[0063] Next, the shaped body was loaded into a superhigh pressure heating device, and heated at a pressure of 4.5 GPa at 1300°C for 15 minutes. Thus, the cBN sintered body of the example was obtained.

[0064] Hereinafter, the manufacturing method will be described in more detail. The TiN raw material powder, the Al raw material powder, and AI2O3 were mixed at a ratio of 77%, 18%, and 6% by volume to produce a first mixed powder. Then, the first mixed powder produced and the second mixed powder described above were mixed at a ratio of 73:27 by volume to produce a cBN sintered body. This sample is referred to as "Sample No. 1".

[0065] In addition, the TiN raw material powder, the Al raw material powder, and AI2O3 were mixed at a ratio of 76%, 13%, and 11% by volume to produce a first mixed powder. Then, the first mixed powder produced and the second mixed powder described above were mixed at a ratio of 73:27 by volume to produce a cBN sintered body. This sample is referred to as "Sample No. 2". Sample No. 1 and Sample No. 2 correspond to the examples of the cBN sintered body of the present application.

[0066] In addition, hereinafter, a cBN sintered body commercially available is referred to as "Sample No. 3". In addition, a comparative sample is referred to as "Sample No. 4". Sample No. 3 and Sample No. 4 correspond to the comparative examples of the cBN sintered body of the present application. Also, Sample No. 1 and Sample No. 2 differ from the comparative sample in the raw material. Specifically, Sample No. 1 and Sample No. 2 use a metal Al powder as a raw material powder, and in contrast, the comparative sample uses an AlN powder.

[0067] For these samples No. 1 to No. 4, after pulverization, measurement was performed using an X-ray diffractometer (XRD), and from the values of 2Θ (2Θ is the diffraction angle) obtained, identification was performed using JCPDS cards. The numbers of the JCPDS cards used were 01-077-8873 for cBN, 01-087-0632 for TiN, 01-085-2083 for TiB2, 00-025-1133 for AlN, and 01-075-0784 for Al2O3. The results are shown in Table 1. Figure 4 Figure 4 Table 1 is a table summarizing the results of expressing the peak intensity height of the XRD measurement in terms of the count of the counter per 1 second of scintillation. Also, Figure 4 in Table 1, "AlN / Al2O3 (%) " is the value obtained by dividing AlN (100) by Al2O3 (104) and multiplying by 100, and "TiB2 / cBN (%) " is the value obtained by dividing TiB2 (101) by cBN (111) and multiplying by 100.

[0068] Further, Figure 5 Fig. 1 is a graph showing the results of the XRD measurement of sample No. 1, Figure 6 Fig. 3 is a graph showing the results of the XRD measurement of sample No. 3.

[0069] As shown in Table 1, Figure 4 as the samples No. 1 and No. 2 of the examples, TiN (200) is greater than cBN (111). In contrast to this, as the samples No. 3 and No. 4 of the comparative examples, TiN (200) is less than cBN (111).

[0070] Further, as the sample No. 1 of the examples, AlN (100) is greater than Al2O3 (104). Specifically, in sample No. 1, AlN (100) is 1.41 times Al2O3 (104). In contrast to this, as the sample No. 3 of the comparative examples, AlN (100) is less than Al2O3 (104).

[0071] Further, in sample No. 1, TiB2 (101) is 0.303 times cBN (111), and in sample No. 2, TiB2 (101) is 0.302 times cBN (111). In this way, in the samples No. 1 and No. 2 of the examples, TiB2 (101) is 0.25 times or more cBN (111). In contrast to this, in sample No. 3, TiB2 (101) is 0.203 times cBN (111), and in sample No. 4, TiB2 (101) is 0.134 times cBN (111). In this way, in the samples No. 3 and No. 4 of the comparative examples, TiB2 (101) is less than 0.25 times cBN (111). ​

[0072] Next, cutting tests were conducted on each sample under the following cutting conditions to evaluate wear resistance, stability, and chipping resistance. The results showed... Figure 7 middle. Figure 7 This is a table summarizing the evaluation results of the wear resistance and stability of each sample.

[0073] <Cutting Conditions>

[0074] (Abrasion resistance evaluation test)

[0075] Cutting method: Turning / Outer diameter machining

[0076] Material to be cut: SCM415 (carburized and quenched material)

[0077] Cutting speed: 150 m / min

[0078] Feed rate: 0.1 mm / rev

[0079] Depth of cut: 0.2mm

[0080] Evaluation method: The time when the wear reaches 0.15mm, or the time when the evaluation stops based on the condition of the tool head.

[0081] (Stability evaluation test)

[0082] Cutting method: Turning and end face machining

[0083] Workpiece material: SCM415 (carburized and quenched material) 8-hole

[0084] Cutting speed: 150 m / min

[0085] Feed rate: 0.2 mm / rev

[0086] Depth of cut: 0.2mm

[0087] Evaluation method: Number of impacts when the cutter head breaks

[0088] like Figure 7 As shown, sample No. 1, as an example, exhibits superior wear resistance and stability compared to samples No. 3 and No. 4, which are comparative examples. Furthermore, sample No. 1 demonstrates superior wear resistance and stability compared to sample No. 2, which is also an example. Additionally, sample No. 2 exhibits superior wear resistance and stability compared to sample No. 4, which is a comparative example. Moreover, sample No. 2 demonstrates superior wear resistance and stability compared to sample No. 3, which is a comparative example.

[0089] Thus, the cBN sintered body of the embodiment, although containing Al compound particles having poor mechanical properties, has excellent mechanical properties and small variation in mechanical properties by controlling the size of the Al compound particles to be within an appropriate range.

[0090] As described above, the insert (as an example, the insert 1) of the embodiment has a cBN sintered body in which a plurality of cBN particles (as an example, the cBN particles 11) are bonded via a binder phase (as an example, the binder phase 12). In a cross section of the cBN sintered body, the cBN particles account for 60% or more of the area. In addition, the binder phase contains Al compound particles containing at least one of AlN and Al203. In addition, the particle size distribution of the Al compound particles in the cross section of the cBN sintered body is such that, in a cumulative distribution of the Al compound particles on a number basis, the proportion of Al compound particles having a particle diameter of 0.3 μm or more is 5% or more, and the proportion of Al compound particles having a particle diameter of 0.5 μm or more is less than 5%.

[0091] In addition, the particle size distribution of the Al compound particles in the cross section of the cBN sintered body is such that, in a cumulative distribution of the Al compound particles on a number basis, the proportion of Al compound particles having a particle diameter of 0.3 μm or more is 7% or more, and the proportion of Al compound particles having a particle diameter of 0.5 μm or more is less than 2%.

[0092] As described above, the insert (as an example, the insert 1) of the embodiment has a cBN sintered body containing cBN and TiN, and in observation of a cross section of the cBN sintered body, the cBN accounts for 60% or more of the area. In addition, when the X-ray intensity of the (111) crystal plane of the cBN in X-ray diffraction of the cBN sintered body is denoted as cBN (111), and the X-ray intensity of the (200) crystal plane of the TiN in X-ray diffraction of the cBN sintered body is denoted as TiN (200), the TiN (200) is greater than the cBN (111).

[0093] Thus, the cBN sintered body of the embodiment contains TiN and cBN in an amount of 5% or more, respectively, and thereby has excellent balance between wear resistance and chipping resistance.

[0094] The insert of the embodiment can further have a coating layer (as an example, the coating layer 20) on the cBN sintered body. By having the coating layer, the wear resistance and the heat resistance can be further improved.

[0095] In the above-described embodiment, the example shown is a case where the shapes of the upper surface and the lower surface of the cutting tool 100 are parallelogram, but the shapes of the upper surface and the lower surface of the cutting tool 100 can also be rhombus or square, or the like. In addition, the shapes of the upper surface and the lower surface of the cutting tool 100 can also be triangle, pentagon, hexagon, or the like.

[0096] In addition, the shape of the cutting tool 100 can be either positive or negative. The positive type is a type in which the side surface is inclined with respect to a central axis passing through the center of the upper surface and the center of the lower surface of the cutting tool 100, and the negative type is a type in which the side surface is parallel with respect to the above-mentioned central axis.

[0097] Further effects and modifications will readily occur to those skilled in the art. The disclosure

[0098] Symbol Explanation

[0099] 1: Blade

[0100] 2: Body portion

[0101] 4: Support surface

[0102] 5: Through-hole

[0103] 6: First surface

[0104] 7: Second surface

[0105] 8: Cutting edge

[0106] 10: Base

[0107] 20: Coating

[0108] 30: Substrate

[0109] 40: Bonding material

[0110] 70: Shank

[0111] 73: Clamping groove

[0112] 75: Bolt

[0113] 100: Cutting tool

Claims

1. A blade having a cBN-based sintered body containing cBN, TiN and TiB2, In observation of a cross section of the cBN-based sintered body, the cBN is 60 area% or more, Let the X-ray intensity of the (111) crystal plane of the cBN in X-ray diffraction of the cBN-based sintered body be cBN(111), Let the X-ray intensity of the (200) crystal plane of the TiN in X-ray diffraction of the cBN-based sintered body be TiN(200), Let the X-ray intensity of the (101) crystal plane of the TiB2 in X-ray diffraction of the cBN-based sintered body be TiB2(101), The TiN(200) is greater than the cBN(111), The TiB2(101) is 0.25 times or more of the cBN(111).

2. The blade according to claim 1, wherein, The cBN-based sintered body contains AlN and Al2O3, Let the X-ray intensity of the (100) crystal plane of the AlN in X-ray diffraction of the cBN-based sintered body be AlN(100), Let the X-ray intensity of the (104) crystal plane of the Al2O3 in X-ray diffraction of the cBN-based sintered body be Al2O3(104), The AlN(100) is greater than the Al2O3(104).

3. The insert according to claim 1 or 2, wherein, In the binder phase of the cBN-based sintered body, Al is contained at 0.5 atom% or more and 3.0 atom% or less.

4. The blade of claim 1 or 2, wherein, A coating layer is further provided on the cBN-based sintered body.

5. A cutting tool having: A rod-shaped shank having a clamping groove at an end portion; The blade according to any one of claims 1 to 4 is provided in the clamping groove.

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