Coated tool and cutting tool

Abstract

The coated cutting tool (1) is provided with a base body (3) and a coating layer (7) located on the surface (5) of the base body. The base has: a hard phase containing W and C; a solid solution phase containing W, C, and Ti; and a binder phase containing an iron group metal. And the residual stress of the hard phase in the matrix is a. And a is in the range of-2.5 to-0.2 GPa. And the residual stress of the hard phase on the surface of the substrate is set to be b. And b is in the range of-2.0 to 0.0 GPa.

Description

[0001] Cross-references of related applications

[0002] This application claims the benefit of priority based on Japanese Patent Application No. 2022-086717 filed on May 27, 2022, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] The invention relates to a coated tool and a cutting tool. Background Art

[0004] Cemented carbide containing WC (tungsten carbide) as a hard phase is used for the substrate in coated tools, etc., and is used for cutting tools such as end mills. For example, Japanese Patent Gazette No. 3424263 (Patent Document 1) states that the residual stress of the hard phase in the base material is in the range of -0.5 to 0 GPa and the residual stress in the coating layer is in the range of -0.2 to 0.2 GPa, thereby suppressing the peeling at the interface between the substrate and the coating layer.

[0005] In addition, Patent Document 1 states that when coating a cemented carbide, since the thermal expansion coefficient of the coating layer is larger than that of the base material, there are many cases where tensile stress remains in the coating layer after coating, and the fracture resistance is reduced due to coating. In addition, Patent Document 1 does not record the sintering conditions such as cooling rate. Summary of the invention

[0006] A coated tool according to one non-limiting aspect of the present invention comprises a substrate and a coating layer located on the surface of the substrate. The substrate comprises: a hard phase containing W and C; a solid solution phase containing W, C and Ti; and a binder phase containing an iron group metal. The residual stress of the hard phase in the substrate is set to a. The a is in the range of -2.5 to -0.2 GPa. The residual stress of the hard phase on the surface of the substrate is set to b. The b is in the range of -2.0 to 0.0 GPa.

[0007] A cutting tool according to a non-limiting aspect of the present invention includes: a shank extending from a first end toward a second end and having a groove on the first end side; and the above-mentioned coated tool located in the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a perspective view of a coated tool illustrating a non-limiting aspect of the present invention.

[0009] Figure 2 yes Figure 1 A cross-sectional view near the surface of a coated tool is shown.

[0010] Figure 3It is a perspective view of a cutting tool showing a non-limiting aspect of the present invention. DETAILED DESCRIPTION

[0011] <Coated tools>

[0012] Hereinafter, the coated tool 1 of the non-limiting aspect of the present invention will be described in detail using the accompanying drawings. However, in the following referenced figures, for the sake of convenience, only the main components necessary for describing the embodiment are simplified. Therefore, the coated tool 1 can have any constituent components not shown in the referenced figures. In addition, the dimensions of the components in the figures do not accurately represent the dimensions of the actual constituent components and the dimensional ratios of the components. These points are also the same in the cutting tool described later.

[0013] Coated tool 1 Figure 1 as well as Figure 2 As shown in the non-limiting example, the substrate 3 and the coating layer 7 located on the surface 5 of the substrate 3 may be provided.

[0014] The matrix 3 may also have a hard phase, a solid solution phase, and a binder phase.

[0015] The hard phase may also contain W (tungsten) and C (carbon). In other words, the hard phase may also contain WC. The hard phase may also contain WC as a main component. "Main component" may also mean a component with the largest mass % value compared to other components. Specifically, the top two values ​​of mass % of the components contained in the hard phase may also be W and C.

[0016] The solid solution phase may also contain W, C and Ti (titanium). The solid solution phase may also contain W, C and Ti as main components. That is, in the solid solution phase, the total value of the mass % of W, C and Ti may also be the largest. In addition, the top three values ​​of the mass % of the components contained in the solid solution phase may also be W, C and Ti.

[0017] The binding phase may also contain an iron group (iron) metal. Examples of the iron group metal include Co (cobalt) and Ni (nickel). The binding phase may also contain at least one of Co and Ni. The binding phase may also contain an iron group metal as a main component. The binding phase may function as a phase that binds adjacent hard phases.

[0018] The composition of each of the hard phase, the solid solution phase, and the binder phase can also be measured, for example, by energy dispersive X-ray spectroscopy (EDS). The measurement can also be performed using EDS attached to an electron microscope. As electron microscopes, for example, scanning electron microscopes (Scanning Electron Microscopy: SEM) and transmission electron microscopes (Transmission Electron Microscopy: TEM) can be cited. The measurement conditions of EDS can also be set, for example, as follows.

[0019] Accelerating voltage: 20 kV

[0020] Electron beam diameter: 12-15 (adjust the device detection count to 20,000 or more)

[0021] Here, the residual stress of the hard phase in the substrate 3 can also be set to a. a can also be in the range of -2.5 to -0.2 GPa. In addition, the residual stress of the hard phase on the surface 5 of the substrate 3 can also be set to b. b can also be in the range of -2.0 to 0.0 GPa. When the residual stresses inside the substrate 3 and on the surface 5 of the substrate 3 are within the above-mentioned range, the bonding force between the substrate 3 and the coating layer 7 is easily improved, and the peeling between the substrate 3 and the coating layer 7 is easily suppressed. In other words, the peeling between the two can be reduced. Therefore, the wear resistance of the coated tool 1 is high.

[0022] “Inside the substrate” may mean the inside of the substrate 3. Specifically, the inside of the substrate 3 separated by 0.05 to 2 mm from the surface 5 of the substrate 3 may be referred to as “inside the substrate”.

[0023] The residual stress may also be a compressive stress. When the residual stress value is negative, the residual stress is a compressive stress. The residual stress may be measured, for example, by the sin2ψ method using an X-ray stress measuring device (X-Ray Diffraction: XRD). The measurement conditions may also be set, for example, as follows.

[0024] Radiation source: CuK

[0025] Output: 50kV, 1000μA

[0026] Collimator diameter: 0.5mmφ

[0027] Measurement method: 2D method

[0028] a may also be in the range of -1.3 to -0.5 GPa. In this case, it is easier to suppress the peeling between the substrate 3 and the coating layer 7. It should be noted that when a is in the range of -1.3 to -0.5 GPa, the composition of the substrate 3 may also contain Nb (niobium). In addition, the substrate 3 may also contain a β phase. Nb may also be contained in the β phase or the binding phase, or both the β phase and the binding phase. It should be noted that the β phase may also be a composite carbide including at least one of Ti, Nb, Ta (tantalum) and Zr (zirconium) and W. The composition of the β phase may also be determined, for example, by EDS.

[0029] b may also be in the range of -0.6 to -0.2 GPa. In this case, it is easier to suppress the peeling between the substrate 3 and the coating layer 7. It should be noted that when b is in the range of -0.6 to -0.2 GPa, the composition of the substrate 3 may also contain Nb. In addition, the substrate 3 may also contain a β phase. Nb may also be contained in the β phase or the binder phase, or in both the β phase and the binder phase.

[0030] The ratio of a to b (a / b) may be 1.2 or more. In this case, the residual stress is maintained until the inside of the substrate 3, thereby easily suppressing the progress of cracks. Therefore, the bonding force between the substrate 3 and the coating layer 7 is easily improved. In addition, when used for a cutting tool, the cutting performance such as the intermittent performance is easily improved.

[0031] The ratio of a to b (a / b) may also be greater than 2.1. In this case, the bonding strength between the substrate 3 and the coating layer 7 is more easily improved. It should be noted that the upper limit of the ratio (a / b) may also be 2.5. When the ratio (a / b) is greater than 2.1, the composition of the substrate 3 may also contain Nb. In addition, the substrate 3 may also contain a β phase. Nb may also be contained in the β phase or the binder phase, or in both the β phase and the binder phase.

[0032] The coating layer 7 may be located on the entire surface 5 of the base 3 or only on a portion of the surface 5 of the base 3. That is, the coating layer 7 may be located on at least a portion of the surface 5 of the base 3.

[0033] The coating layer 7 may also be formed by chemical vapor deposition (CVD). In other words, the coating layer 7 may also be a CVD film. It should be noted that the coating layer 7 may also be a PVD film formed by physical vapor deposition (PVD).

[0034] The coating layer 7 may be a single-layer structure or a structure in which a plurality of layers are stacked. Examples of the composition of the coating layer 7 include TiCN (titanium carbonitride), Al 2 O 3 (aluminum oxide), and TiN (titanium nitride).

[0035] Coating layer 7 such as Figure 2 As shown in the non-limiting example, the first layer 9, the second layer 11 and the third layer 13 may be provided from the substrate 3 side. The first layer 9 may contain TiCN. The second layer 11 may contain Al2O3. The third layer 13 may contain at least one of TiN and TiCN.

[0036] It should be noted that the first layer 9 may also contain TiCN as a main component. The second layer 11 may also contain Al2O3 as a main component. The third layer 13 may also contain at least one of TiN and TiCN as a main component. In addition, the first layer 9 may also be in contact with the substrate 3. The second layer 11 may also be in contact with the first layer 9. The third layer 13 may also be in contact with the second layer 11.

[0037] The coating layer 7 is not limited to a specific thickness. For example, the thickness of the first layer 9 can also be set to about 5 to 20 μm. The thickness of the second layer 11 can also be set to about 2 to 15 μm. The thickness of the third layer 13 can also be set to about 0.1 to 20 μm. The thickness of the coating layer 7 can also be measured by cross-sectional observation using an electron microscope. In addition, the thickness of the coating layer 7 can also be an average value. For example, the thickness can also be measured at more than 10 measuring points at intervals of 1 μm within a width of more than 10 μm at any position of each layer, and the average value can be calculated.

[0038] The peeling rate (%) can also be used to evaluate the peeling at the interface between the substrate 3 and the coating layer 7. A peeling rate of 0% means that the substrate 3 and the coating layer 7 are completely bonded, and a peeling rate of 100% means that the substrate 3 and the coating layer 7 are completely peeled.

[0039] The peeling rate can also be measured by a Rockwell hardness test. The measurement conditions can also be set as follows, for example. The test load can also be set to 60 kg. Peeling can also be judged as peeling when the substrate 3 is exposed around the indentation after the Rockwell hardness test. The peeling rate (%) can also be calculated according to the formula: (peeling number / measurement number) × 100. The measurement number can also be set to 10 or more.

[0040] The peeling rate may also be 25% or less. In this case, the bonding strength between the substrate 3 and the coating layer 7 is high. The peeling rate may also be 10% or less. The peeling rate may also be 5% or less. It should be noted that the lower limit of the peeling rate may also be 0%. That is, the peeling rate may also be 0%.

[0041] exist Figure 1 In FIG. 1 , a cutting insert is shown as a non-limiting example of the coated tool 1. It should be noted that the coated tool 1 is not limited to the cutting insert.

[0042] The coated tool 1 may include a first surface 15 (upper surface), a second surface 17 (side surface) adjacent to the first surface 15 , and a cutting edge 19 located at least in a portion of a ridgeline between the first surface 15 and the second surface 17 .

[0043] The first surface 15 may be a rake face. The first surface 15 may be a rake face in its entirety or in part. For example, a region along the cutting edge 19 of the first surface 15 may be a rake face.

[0044] The second surface 17 may be a flank surface. The entire second surface 17 may be a flank surface, or a portion thereof may be a flank surface. For example, a region along the cutting edge 19 of the second surface 17 may be a flank surface.

[0045] The cutting edge 19 may be located at a part of the ridge portion or may be located at the entire ridge portion. The cutting edge 19 can be used for cutting a workpiece.

[0046] The coated tool 1 may also have a through hole 21. The through hole 21 can be used to install a fixing screw or a clamping member when the coated tool 1 is held in the tool holder. The through hole 21 may also be formed from the first surface 15 to the surface (lower surface) located on the opposite side of the first surface 15, and may also be opened on these surfaces. It should be noted that there is no problem with the structure in which the through hole 21 is opened in the mutually opposing areas of the second surface 17.

[0047] The coated tool 1 may also be in the shape of a square plate. It should be noted that the shape of the coated tool 1 is not limited to the shape of a square plate. For example, the first surface 15 may also be in the shape of a triangle, a pentagon, a hexagon or a circle.

[0048] The coated tool 1 is not limited to a specific size. For example, the length of one side of the first surface 15 may be set to about 3 to 20 mm. In addition, the height from the first surface 15 to the surface (lower surface) located on the opposite side of the first surface 15 may be set to about 5 to 20 mm.

[0049] <Method for manufacturing coated cutting tools>

[0050] Next, a method for manufacturing a coated tool according to a non-limiting aspect of the present invention will be described by taking a case where the coated tool 1 is manufactured as an example.

[0051] When manufacturing the coated tool 1, the substrate 3 may be prepared first. First, WC powder, Co powder, TiC powder, etc. may be prepared as raw material powders. The proportion of Co powder may be 4 to 12% by mass. The proportion of TiC powder may be 0.5 to 15% by mass. The remainder may be WC powder.

[0052] As raw material powders, TaC powder, ZrC powder, NbC powder, etc. may also be prepared. The proportion of TaC powder may be 0.1 to 5% by mass. The proportion of ZrC powder may be 0.1 to 3% by mass. The proportion of NbC powder may be 0.1 to 3% by mass.

[0053] The average particle size of the raw material powder may be appropriately selected within the range of 0.1 to 10 μm. The average particle size of the raw material powder may be a value measured by the Microtrac method.

[0054] The prepared raw material powders may be mixed and molded to obtain a molded body. Examples of the molding method include press molding, casting molding, extrusion molding, and cold isostatic pressing.

[0055] The obtained molded body may be subjected to dewaxing treatment and then sintered. The sintering may be performed in a non-oxidizing atmosphere such as vacuum, argon atmosphere, and nitrogen atmosphere. The sintering temperature may be 1450 to 1600° C. The sintering time may be 0.5 to 3 hours.

[0056] It is also possible to cool after sintering to obtain a substrate 3. At this time, the cooling rate can also be set to 6 to 20°C / minute (°C / min). More specifically, the cooling rate can also be set to 6 to 15°C / minute. When cooling is performed at such a cooling rate, a tends to be in the range of -2.5 to -0.2 GPa, and b tends to be in the range of -2.0 to 0.0 GPa. When NbC powder is used as the raw material powder and cooled at the above-mentioned cooling rate, a tends to be in the range of -1.3 to -0.5 GPa, b tends to be in the range of -0.6 to -0.2 GPa, and the ratio (a / b) tends to be greater than 2.1.

[0057] Next, the coating layer 7 may be formed on the surface 5 of the obtained substrate 3 by CVD to obtain the coated tool 1. As the coating layer 7, for example, the first layer 9, the second layer 11 and the third layer 13 may be formed from the substrate 3 side.

[0058] The first layer 9 containing TiCN can also be formed as follows. First, as a reaction gas composition, a mixed gas including 0.1 to 10 volume % of titanium tetrachloride (TiCl4) gas, 10 to 60 volume % of nitrogen (N2) gas, 0.1 to 15 volume % of methane (CH4) gas, and the rest of hydrogen (H2) gas can also be adjusted. In addition, the mixed gas can be introduced into the chamber, the temperature is set to 800 to 1100°C, and the pressure is set to 5 to 30 kPa to form the first layer 9. It should be noted that this film forming condition can also be applied to the third layer 13 containing TiCN.

[0059] The second layer 11 containing Al2O3 can also be formed as follows. First, as a reaction gas composition, a mixed gas including 0.5 to 5 volume % of aluminum chloride (AlCl3) gas, 0.5 to 3.5 volume % of hydrogen chloride (HCl) gas, 0.5 to 5 volume % of carbon dioxide (CO2) gas, 0.5 volume % or less of hydrogen sulfide (H2S) gas, and the rest of hydrogen (H2) gas can also be adjusted. In addition, the mixed gas can be introduced into the chamber, the temperature is set to 930 to 1010°C, and the pressure is set to 5 to 10 kPa to form the second layer 11.

[0060] The third layer 13 containing TiN can also be formed as follows. First, as a reaction gas composition, a mixed gas including 0.1 to 10 volume % of titanium tetrachloride (TiCl4) gas, 10 to 60 volume % of nitrogen (N2) gas, and the remainder of hydrogen (H2) gas can be adjusted. In addition, the mixed gas can be introduced into the chamber, the temperature is set to 800 to 1010°C, and the pressure is set to 10 to 85 kPa to form the third layer 13 containing TiN.

[0061] It should be noted that the above-mentioned manufacturing method is an example of a method for manufacturing the coated tool 1. Therefore, the coated tool 1 is of course not limited to the coated tool manufactured by the above-mentioned manufacturing method.

[0062] <Cutting tools>

[0063] Next, the case of having the above-mentioned coated tool 1 is taken as an example, using Figure 3 A cutting tool 101 according to a non-limiting aspect of the present invention will be described.

[0064] Cutting tool 101 Figure 3As shown in the non-limiting example, a tool holder 103 extending from a first end 103a toward a second end 103b and having a tool groove 105 on one side of the first end 103a and a coated tool 1 located in the tool groove 105 may also be provided. When the cutting tool 101 includes the coated tool 1, the coated tool 1 has high wear resistance, so stable cutting can be performed.

[0065] The knife groove 105 may also be a portion for assembling the coated tool 1. The knife groove 105 may also be open on the outer peripheral surface of the knife handle 103 and the end surface on one side of the first end 103a.

[0066] The coated tool 1 may be mounted on the knife groove 105 in such a manner that the cutting edge 19 protrudes outward from the tool holder 103. In addition, the coated tool 1 may be mounted on the knife groove 105 by means of a fixing screw 107. That is, the coated tool 1 may be mounted on the knife groove 105 by inserting the fixing screw 107 into the through hole 21 of the coated tool 1 and inserting the front end of the fixing screw 107 into the screw hole formed in the knife groove 105 so that the threaded parts are screwed together. At this time, the lower surface of the coated tool 1 may be in direct contact with the knife groove 105, or a sheet may be sandwiched between the coated tool 1 and the knife groove 105.

[0067] Examples of the material of the handle 103 include steel and cast iron. When the material of the handle 103 is steel, the handle 103 has high toughness.

[0068] exist Figure 3 In the example shown, a cutting tool 101 used for so-called turning processing is illustrated. As turning processing, for example, inner diameter processing, outer diameter processing, and grooving processing can be cited. It should be noted that the use of the cutting tool 101 is not limited to turning processing. For example, there is no problem in using the cutting tool 101 for milling processing.

[0069] As mentioned above, the coated tool 1 and the cutting tool 101 which are non-limiting aspects of the present invention are exemplified, but the present invention is not limited to the above-mentioned embodiments, and any embodiment is possible as long as it does not depart from the gist of the present invention.

[0070] For example, in the above non-limiting embodiment, the coated tool 1 is used as a cutting tool 101 as an example, but the coated tool 1 can also be applied to other uses. Other uses include lubricating parts, wear-resistant parts such as molds, tools such as excavating tools and cutting tools, and impact-resistant parts.

[0071] In addition, the coated tool 1 and the cutting tool 101 may have the following structures.

[0072] (1) A coated tool comprises a substrate and a coating layer located on a surface of the substrate, wherein the substrate comprises: a hard phase containing W and C; a solid solution phase containing W, C and Ti; and a binder phase containing an iron group metal, wherein the residual stress of the hard phase in the substrate is set to a, and a is in the range of -2.5 to -0.2 GPa, and the residual stress of the hard phase on the surface of the substrate is set to b, and b is in the range of -2.0 to 0.0 GPa.

[0073] (2) In the coated tool of (1) above, the a may be in the range of -1.3 to -0.5 GPa.

[0074] (3) In the coated tool of (1) or (2) above, b may be in the range of -0.6 to -0.2 GPa.

[0075] (4) In any one of the coated cutting tools described in (1) to (3) above, a ratio of a to b (a / b) may be 1.2 or more.

[0076] (5) In any one of the coated cutting tools described in (1) to (4) above, a ratio of a to b (a / b) may be 2.1 or more.

[0077] (6) In any one of the coated cutting tools described in (1) to (5) above, the composition of the matrix may contain Nb.

[0078] (7) In the coated tool of (6) above, the matrix may include a β phase, and the Nb may be included in the β phase or the binder phase, or in both the β phase and the binder phase.

[0079] (8) In any of the coated cutting tools described in (1) to (7) above, the coating layer may include, from the substrate side, a first layer containing TiCN, a second layer containing Al2O3, and a third layer containing at least one of TiN and TiCN.

[0080] (9) A cutting tool may include: a tool holder extending from a first end toward a second end and having a tool groove on the first end side; and a coated tool according to any one of (1) to (8) above, the coated tool being located in the tool groove.

[0081] Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to the following Examples.

[0082] Example

[0083] [Sample No. 1 to 10]

[0084] <Manufacturing of coated tools>

[0085] First, a matrix was prepared. Specifically, WC powder with an average particle size of 9 μm, TiC powder with an average particle size of 1.5 μm, TaC powder with an average particle size of 0.9 μm, ZrC powder with an average particle size of 1.5 μm, Co powder with an average particle size of 1.5 μm, and NbC powder with an average particle size of 1.1 μm were prepared as raw material powders. The average particle size of the raw material powders is a value measured by the Michick method.

[0086] Next, the raw material powders were mixed in the ratio of composition A, composition B or composition C shown in Table 1, and stamped into a cutting tool shape (CNMG120408) to obtain a molded body. After dewaxing, the obtained molded body was kept at a temperature of 1550°C for one hour and fired. After firing, the base body was cooled. At this time, the cooling rate was set to the conditions shown in Table 2.

[0087] The compositions of the hard phase, the solid solution phase, and the binder phase in the matrix were measured by EDS. The measurement conditions of EDS were as follows.

[0088] Accelerating voltage: 20 kV

[0089] Electron beam diameter: 12-15 (adjust the device detection count to 20,000 or more)

[0090] The results of EDS measurement show that the obtained matrix has a hard phase containing W and C as main components, a solid solution phase containing W, C and Ti as main components, and a binder phase containing an iron group metal (Co) as main component. The matrix obtained with composition B or composition C contains Nb in the composition of the matrix and contains β phase. The result of measuring the composition of the β phase by EDS is that the β phase is (W, Ti, Nb, Ta, Zr) C. In addition, Nb is contained in the β phase and the binder phase.

[0091] Next, a coating layer was formed on the surface of the obtained substrate by CVD method to obtain the coated tool shown in Table 2. The coating layer was formed from the substrate side with a first layer having a thickness of 9 μm containing TiCN as the main component, a second layer having a thickness of 7 μm containing Al2O3 as the main component, and a third layer having a thickness of 16 μm containing TiN as the main component. It should be noted that the thickness of each layer is an average value.

[0092] <Evaluation>

[0093] The residual stress and the peeling rate of the obtained coated tool were measured. The respective measuring methods are shown below, and the results are shown in Table 2.

[0094] (Residual stress)

[0095] The measurement was performed by the sin2ψ method using XRD. The inside of the substrate separated by 2 mm from the surface of the substrate was defined as "inside the substrate." The measurement conditions were as follows.

[0096] Radiation source: CuK

[0097] Output: 50kV, 1000μA

[0098] Collimator diameter: 0.5mmφ

[0099] Measurement method: 2D method

[0100] (Peeling rate)

[0101] The Rockwell hardness test was performed. The test conditions were as follows. The test load was set to 60 kg. Debonding was determined when the substrate was exposed around the indentation after the Rockwell hardness test. The debonding rate (%) was calculated according to the formula: (debonding number / number of measurements) × 100. The number of measurements was set to 20.

[0102] [Table 1]

[0103]

[0104] [Table 2]

[0105]

[0106] Samples No. 1 to 4 and 7 to 9 showed higher bonding properties (bonding strength) between the substrate and the coating layer than Samples No. 5 to 6 and 10. It should be noted that even among the samples with poor peeling rates, Sample No. 10 showed a better result than Samples No. 5 to 6.

[0107] Samples Nos. 1 to 3 and 5 to 6 were also subjected to cutting evaluation under the following conditions.

[0108] Processing form: Turning

[0109] Cutting speed: 150m / min

[0110] Feed: 0.4mm / rev

[0111] Cutting depth: 0.5mm

[0112] Cutting material: SCM435 φ200 round bar (4 slots)

[0113] Processing state: wet

[0114] The evaluation results are shown in Table 3. In the evaluation results of Table 3, "the number of impacts until the blade edge is broken" indicates the number of impacts until the blade edge is broken during cutting, and can also be called an intermittent performance evaluation.

[0115] [Table 3]

[0116]

[0117] Samples No. 1 to 3 have higher wear resistance of the cutting edge than Samples No. 5 to 6, and can perform stable cutting as a cutting tool.

[0118] Description of Reference Numerals

[0119] 1 Coated tools

[0120] 3 Matrix

[0121] 5 Surface

[0122] 7 Coating

[0123] 9 First floor

[0124] 11 Second Floor

[0125] 13 Third Floor

[0126] 15 First side (upper surface)

[0127] 17 Second side (side)

[0128] 19 Cutting Edge

[0129] 21 Through hole

[0130] 101 Cutting Tools

[0131] 103 Handle

[0132] 103a First End

[0133] 103b Second end

[0134] 105 Slot

[0135] 107 Fixing screw.

Claims

1. A coated tool comprising a substrate and a coating layer located on the surface of the substrate, wherein: The substrate has: Hard phase, which contains W and C; a solid solution phase containing W, C and Ti; as well as A binder phase, which contains an iron group metal, The residual stress of the hard phase in the matrix is ​​defined as a, and a is in the range of -2.5 to -0.2 GPa. The residual stress of the hard phase on the surface of the substrate is denoted by b, and b is in the range of -2.0 to 0.0 GPa.

2. The coated tool according to claim 1, wherein: The a is in the range of -1.3 to -0.5 GPa.

3. The coated tool according to claim 1 or 2, wherein: The b is in the range of -0.6 to -0.2 GPa.

4. The coated tool according to any one of claims 1 to 3, wherein: The ratio a / b of the a to b is 1.2 or more.

5. The coated tool according to any one of claims 1 to 4, wherein: The ratio a / b of the a to b is 2.1 or more.

6. The coated tool according to any one of claims 1 to 5, wherein: The composition of the matrix contains Nb.

7. The coated tool according to claim 6, wherein: The matrix contains a β phase, The Nb is contained in the β phase or the binder phase, or in both the β phase and the binder phase.

8. The coated tool according to any one of claims 1 to 7, wherein: The coating layer has, starting from the substrate side: The first layer, which contains TiCN; A second layer comprising Al2O3; and The third layer contains at least one of TiN and TiCN.

9. A cutting tool, wherein: The cutting tool has: a knife handle extending from a first end toward a second end and having a knife groove on a side of the first end; and The coated cutting tool according to any one of claims 1 to 8, which is located in the cutting groove.

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