COATED TOOL AND CUTTING TOOL

Abstract

A coated tool according to the present disclosure includes a base body, a first coating layer, a second coating layer, and a third coating layer. The first coating layer contains Al, Ti, Cr, and N. The second coating layer includes a first layer and a second layer. The first layer contains Al, Ti, Cr, and N and has a Ti / Al ratio greater than the Ti / Al ratio in the first coating layer. The second layer contains Al, Ti, Cr, and N and has a Cr / Al ratio greater than the Cr / Al ratio in the first coating layer. The third coating layer includes a third layer and a fourth layer. The third layer contains Al, Ti, Cr, and N and has a Ti / Al ratio greater than the Ti / Al ratio in the first layer. The fourth layer contains Al, Ti, Cr, and N and has a Cr / Al ratio greater than the Cr / Al ratio in the second layer.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a coated tool and a cutting tool. BACKGROUND OF THE INVENTION

[0002] Known tools used for cutting operations such as turning operations or milling operations include a coated tool in which a surface of a base body made of a cemented carbide alloy, cermet, ceramic or the like is coated with a coating layer to improve wear resistance and the like. CITATION LISTPATENT LITERATURE Patent Document 1: JP 2004-50381 A Patent Document 2: JP 2018-30212 A BRIEF EXPLANATION

[0003] A coated tool according to one aspect of the present disclosure includes a base body, a first coating layer disposed on the base body, a second coating layer disposed on the first coating layer, and a third coating layer disposed on the second coating layer. The first coating layer contains Al, Ti, Cr, and N. The second coating layer includes a first layer and a second layer. The first layer contains Al, Ti, Cr, and N and has a Ti / Al ratio greater than the Ti / Al ratio in the first coating layer. The second layer contains Al, Ti, Cr, and N and has a Cr / Al ratio greater than the Cr / Al ratio in the first coating layer. The third coating layer includes a third and a fourth layer.The third layer contains Al, Ti, Cr, and N and has a Ti / Al ratio that is higher than the Ti / Al ratio in the first layer. The fourth layer contains Al, Ti, Cr, and N and has a Cr / Al ratio that is higher than the Cr / Al ratio in the second layer. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing an example of a coated tool according to an embodiment. Fig. 2 is a side sectional view showing an example of the coated tool according to the embodiment. Fig. 3 is a cross-sectional view showing an example of a coating layer according to a first embodiment. Fig. 4A is a schematic view describing a Ti / Al ratio in a coating layer according to the first embodiment. Fig.4B is a schematic view describing a Cr / Al ratio in the coating layer according to the first embodiment. Fig. 5A is a cross-sectional view showing an example of a first coating layer included in the coating layer according to the first embodiment. Fig. 5B is a cross-sectional view showing an example of a second coating layer included in the coating layer according to the first embodiment. Fig. 5C is a cross-sectional view showing an example of a third coating layer included in the coating layer according to the first embodiment. Fig. 6 is a cross-sectional view showing an example of a coating layer according to a second embodiment. Fig.7A is a schematic view describing a Ti / Al ratio in the coating layer according to the second embodiment. Fig. 7B is a schematic view describing a Cr / Al ratio in the coating layer according to the second embodiment. Fig. 8 is a cross-sectional view showing an example of a fourth coating layer included in the coating layer according to the second embodiment. Fig. 9 is a diagram schematically showing an example of a deposition apparatus for forming a coating layer on a base body. Fig. 10 is a front view showing an example of a cutting tool according to the embodiment. DESCRIPTION OF THE EMBODIMENTS

[0004] The following is a detailed description of embodiments of a coated tool and a cutting tool according to the present disclosure (hereinafter referred to as "embodiments") with reference to the drawings. The coated tool and the cutting tool according to the present disclosure are not limited by the embodiments. The embodiments can be appropriately combined so that they do not contradict each other in explanatory content. In the following embodiments, the same portions are denoted by the same reference numerals, and redundant explanations are omitted.

[0005] In the embodiments described below, terms such as "constant," "orthogonal," "perpendicular," or "parallel" may be used, but these terms need not be strictly "constant," "orthogonal," "perpendicular," or "parallel." In other words, each of the terms described above allows for variations, for example, in manufacturing accuracy, installation accuracy, or the like.

[0006] Known tools used for cutting operations such as turning operations or milling operations include a coated tool in which a surface of a base body made of a cemented carbide alloy, cermet, ceramic or the like is coated with a coating layer to improve wear resistance and the like.

[0007] The related technology described above offers scope for further improvements in terms of extending tool life.

[0008] Therefore, it is expected that a technique will be developed that can overcome the above problem and extend the tool life. Coated tool

[0009] Fig. 1 is a perspective view showing an example of a coated tool according to an embodiment. Fig. 2 is a side sectional view showing an example of the coated tool according to the embodiment. As shown in Fig. 1, the coated tool 1 according to the embodiment has a tip body 2. Lace body 2

[0010] The tip body 2 has a hexagonal shape, the shape of an upper surface and a lower surface (surfaces which have a Fig. 1) is a parallelogram.

[0011] A corner portion of the tip body 2 functions as a cutting edge portion. The cutting edge portion has a first surface (e.g., a top surface) and a second surface (e.g., a side surface) connected to the first surface. In the embodiment, the first surface functions as a "chip surface" for receiving chips generated by cutting, and the second surface functions as a "clearance surface." A cutting edge is disposed on at least a part of a ridge line where the first surface and the second surface intersect, and the coated tool 1 cuts a workpiece by abutting the cutting edge against the workpiece.

[0012] A through hole 5, which penetrates the tip body 2 vertically, is arranged in the central portion of the tip body 2. A screw 75 for fixing the coated tool 1 to a holder 70, which will be described below, is inserted into the through hole 5 (see Fig. 10).

[0013] As in Fig. 2, the tip body 2 has a base body 10 and a coating layer 20. Base body 10

[0014] The base body 10 is made, for example, of a cemented carbide alloy. The cemented carbide alloy contains tungsten (W), in particular tungsten carbide (WC). The cemented carbide alloy may contain nickel (Ni) or cobalt (Co). In particular, the base body 10 is made of a WC-based cemented carbide alloy containing WC grains as the hard phase component and Co as the main component of a binder phase.

[0015] The base body 10 can be made of cermet. The cermet contains, for example, titanium (Ti), in particular titanium carbide (TiC) or titanium nitride (TiN). The cermet can contain Ni or Co.

[0016] The base body 10 can be made of a cubic boron nitride sintered body containing cubic boron nitride (cBN) particles. The base body 10 can contain not only cubic boron nitride (cBN) particles, but also particles of, for example, hexagonal boron nitride (hBN), rhombohedral boron nitride (rBN), or wurtzite boron nitride (wBN).

[0017] The base body 10 can be made of ceramic. An example of the ceramic includes Al2O3 (aluminum oxide). Examples of the type of Al2O3 include κ-Al2O3 and α-Al2O3. The ceramic can contain other elements in the alumina. For example, in addition to alumina, the ceramic can contain at least one element selected from the group consisting of magnesium (Mg), calcium (Ca), strontium (Sr), silicon (Si), and elements of Group 3 of the Periodic Table. Coating layer 20

[0018] The base body 10 is coated with the coating layer 20, for example, to increase the wear resistance and heat resistance of the base body 10. In the example in Fig.2, the coating layer 20 completely covers the base body 10. The coating layer 20 can be arranged at least on the base body 10. When the coating layer 20 is arranged on the first surface (here, the upper surface) of the base body 10, the first surface has high wear resistance and heat resistance. When the coating layer 20 is arranged on the second surface (here, the side surface) of the base body 10, the second surface has high wear resistance and heat resistance. Coating layer 20A according to the first embodiment

[0019] Here, a specific configuration of the coating layer 20A according to a first embodiment will be described with reference to FIG. Fig. 3, Fig. 4A, Fig. 4B, Fig. 5A, Fig. 5B and Fig. 5C. Fig.3 is a cross-sectional view showing an example of the coating layer according to the first embodiment. Fig. 4A is a schematic view describing a Ti / Al ratio in the coating layer according to the first embodiment. Fig. 4B is a schematic view describing a Cr / Al ratio in the coating layer according to the first embodiment. Fig. 5A is a cross-sectional view showing an example of a first coating layer included in the coating layer according to the first embodiment. Fig. 5B is a cross-sectional view showing an example of a second coating layer included in the coating layer according to the first embodiment. Fig. 5C is a cross-sectional view showing an example of a third coating layer included in the coating layer according to the first embodiment.

[0020] As in Fig. As shown in Figure 3, the coating layer 20A according to the first embodiment, which serves as the coating layer 20, includes a first coating layer 21 disposed on the base body 10, a second coating layer 22 disposed on the first coating layer 21, and a third coating layer 23 disposed on the second coating layer 22. When the tip body 2 includes the intermediate layer 11 in addition to the base body 10 and the coating layer 20A serving as the coating layer 20, the intermediate layer 11 is disposed between the base body 10 and the first coating layer 21, as shown in Figure 3. Fig. 3. In such a case, the first coating layer 21 is arranged on the base body 10 via the intermediate layer 11. First coating layer 21

[0021] The first coating layer 21 contains Al, Ti, Cr, and N. The first coating layer 21 may be an AlTiCrN layer containing AlTiCrN, which is a nitride of Al, Ti, and Cr. Note that the term "AlTiCrN" means that Al, Ti, Cr, and N are present in any ratio, and does not necessarily mean that Al, Ti, Cr, and N are present in a ratio of 1:1:1:1. The first coating layer 21 has a thickness of, for example, 500 nm or more and 1500 nm or less.

[0022] The first coating layer 21 disposed on the base body 10 is capable of reducing residual stresses between the base body 10 and the coating layers (the second coating layer 22 and the third coating layer 23 in the coating layer 20A) disposed on the first coating layer 21. That is, the first coating layer 21 is capable of reducing the residual stresses between the base body 10 and the coating layer 20A. Thus, peeling or cracking between the base body 10 and the coating layer 20A can be reduced. In other words, the adhesion between the base body 10 and the coating layer 20A can be improved. This can extend the service life of the coated tool 1. Second coating layer 22

[0023] As in Fig.As shown in Figure 3, the second cladding layer 22 includes a first layer 31 and a second layer 32. Each of the first layer 31 and the second layer 32 contains Al, Ti, Cr, and N. Each of the first layer 31 and the second layer 32 may be an AlTiCrN layer containing AlTiCrN, which is a nitride of Al, Ti, and Cr. A thickness of the first layer 31 is, for example, 200 nm or more and 400 nm or less. A thickness of the second layer 32 is, for example, 200 nm or more and 400 nm or less.

[0024] The first layer 31 has a Ti / Al ratio that is greater than the Ti / Al ratio in the first coating layer 21. Here, the Ti / Al ratio refers to a ratio of the number of Ti atoms to the number of Al atoms. This improves the wear resistance and chipping resistance of the coating layer 20A without significantly increasing the residual stresses between the base body 10 and the coating layer (the third coating layer 23 in the coating layer 20A) disposed on the second coating layer 22. The first layer 31 may have a Cr / Al ratio that is lower than a Cr / Al ratio in the first coating layer 21.

[0025] The second layer 32 has a Cr / Al ratio that is greater than the Cr / Al ratio in the first coating layer 21. Here, the Cr / Al ratio refers to a ratio of the number of Cr atoms to the number of Al atoms. This improves the lubricity and non-stick properties of the coating layer 20A without significantly increasing the residual stresses between the base body 10 and the coating layer (the third coating layer 23 in the coating layer 20A) disposed on the second coating layer 22. The second layer 32 may have a Ti / Al ratio that is lower than a Ti / Al ratio in the first coating layer 21.

[0026] The second coating layer 22 can improve the wear resistance and chipping resistance of the coating layer 20A, as well as the lubricity and non-stick properties of the coating layer 20A, without significantly increasing the residual stresses between the base body 10 and the coating layer disposed on the second coating layer 22. This can extend the service life of the coated tool 1. Third coating layer 23

[0027] As in Fig.3, the third cladding layer 23 includes a third layer 33 and a fourth layer 34. Each of the third layer 33 and the fourth layer 34 contains Al, Ti, Cr, and N. Each of the third layer 33 and the fourth layer 34 may be an AlTiCrN layer containing AlTiCrN, which is a nitride of, for example, Al, Ti, and Cr. A thickness of the third layer 33 is, for example, 200 nm or more and 400 nm or less. A thickness of the fourth layer 34 is, for example, 200 nm or more and 400 nm or less.

[0028] The third layer 33 has a Ti / Al ratio that is greater than the Ti / Al ratio in the first layer 31. Here, the Ti / Al ratio refers to a ratio of the number of Ti atoms to the number of Al atoms. This can improve the wear resistance and chipping resistance of the coating layer 20A. The third layer 33 may have a Cr / Al ratio that is lower than the Cr / Al ratio in the first layer 31.

[0029] The fourth layer 34 has a Cr / Al ratio that is greater than the Cr / Al ratio in the second layer 32. Here, the Cr / Al ratio refers to a ratio of the number of Cr atoms to the number of Al atoms. This can improve the lubricity and non-stick properties of the coating layer 20A. The fourth layer 34 can have a Ti / Al ratio that is lower than a Ti / Al ratio in the second layer 32.

[0030] The third coating layer 23 can improve the wear resistance and chipping resistance of the coating layer 20A, and also improve the lubricity and non-stick properties of the coating layer 20A. This can extend the service life of the coated tool 1. Example of the Ti / Al ratio in the coating layer 20A

[0031] As shown in Fig. 4A, the Ti / Al ratio in the coating layer 20A may continuously change in the thickness direction of the coating layer 20A. If the Ti / Al ratio is not constant in the target region of the coating layer 20A, the average value of the Ti / Al ratios in such a region may be used as the Ti / Al ratio in the region.

[0032] In the example shown in Figure 4A, the Ti / Al ratio in the coating layer 20A is substantially constant in the first coating layer 21. The Ti / Al ratio in the coating layer 20A is locally maximum in the first layer 31 included in the second coating layer 22 and in the third layer 33 included in the third coating layer 23. The Ti / Al ratio in the coating layer 20A is locally minimum in the second layer 32 included in the second coating layer 22 and in the fourth layer 34 included in the third coating layer 23.

[0033] Here, not only the Ti / Al ratio in the first layer 31 may be larger than the Ti / Al ratio in the first coating layer 21, but also a local maximum value of the Ti / Al ratio in the first layer 31 may be larger than the Ti / Al ratio in the first coating layer 21. Not only the Ti / Al ratio in the third layer 33 may be larger than the Ti / Al ratio in the first layer 31, but also the local maximum value of the Ti / Al ratio in the third layer 33 may be larger than the local maximum value of the Ti / Al ratio in the first layer 31.

[0034] Not only can the Ti / Al ratio in the second layer 32 be smaller than the Ti / Al ratio in the first coating layer 21, but also the local minimum value of the Ti / Al ratio in the second layer 32 can be smaller than the Ti / Al ratio in the first coating layer 21. Not only can the Ti / Al ratio in the fourth layer 34 be smaller than the Ti / Al ratio in the second layer 32, but also the local minimum value of the Ti / Al ratio in the fourth layer 34 can be smaller than the local minimum value of the Ti / Al ratio in the second layer 32. Example of the Cr / Al ratio in the coating layer 20A

[0035] As shown in Fig. 4B, the Cr / Al ratio in the coating layer 20A may continuously change in the thickness direction of the coating layer 20A. If the Cr / Al ratio is not constant in the target region of the coating layer 20A, the average value of the Cr / Al ratios in such a region may be used as the Cr / Al ratio in the region.

[0036] In the example shown in Fig. 4B, the Cr / Al ratio in the coating layer 20A is substantially constant in the first coating layer 21. The Cr / Al ratio in the coating layer 20A is locally maximum in the second layer 32 included in the second coating layer 22 and in the fourth layer 34 included in the third coating layer 23. The Cr / Al ratio in the coating layer 20A is locally minimum in the first layer 31 included in the second coating layer 22 and in the third layer 33 included in the third coating layer 23.

[0037] Here, not only the Cr / Al ratio in the second layer 32 may be larger than the Cr / Al ratio in the first coating layer 21, but also a local maximum value of the Cr / Al ratio in the second layer 32 may be larger than the Cr / Al ratio in the first coating layer 21. Not only the Cr / Al ratio in the fourth layer 34 may be larger than the Cr / Al ratio in the second layer 32, but also the local maximum value of the Cr / Al ratio in the fourth layer 34 may be larger than the local maximum value of the Cr / Al ratio in the second layer 32.

[0038] Not only can the Cr / Al ratio in the first layer 31 be smaller than the Cr / Al ratio in the first coating layer 21, but also the local minimum value of the Cr / Al ratio in the first layer 31 can be smaller than the Cr / Al ratio in the first coating layer 21. Not only can the Cr / Al ratio in the third layer 33 be smaller than the Cr / Al ratio in the first layer 31, but also the local minimum value of the Cr / Al ratio in the third layer 33 can be smaller than the local minimum value of the Cr / Al ratio in the first layer 31.

[0039] Although the coating layer 20A in which the first coating layer 21, the first layer 31, the second layer 32, the third layer 33, and the fourth layer 34 are sequentially layered on the base body 10 is provided, the first coating layer 21, the second layer 32, the first layer 31, the fourth layer 34, and the third layer 33 may be sequentially layered on the base body 10.

[0040] Examples of the first coating layer 21, the second coating layer 22 and the third coating layer 23

[0041] As shown in FIG. 5A, the first coating layer 21 may have a region in which a plurality of composite layers 21a and a plurality of composite layers 21b are alternately layered. Here, a Ti / Al ratio and a Cr / Al ratio in the composite layer 21a are different from a Ti / Al ratio and a Cr / Al ratio in the composite layer 21b, respectively. For example, the Ti / Al ratio in the composite layer 21a is larger than the Ti / Al ratio in the composite layer 21b, and the Cr / Al ratio in the composite layer 21b is larger than the Cr / Al ratio in the composite layer 21a. An average value of the thicknesses of the composite layer 21a and the composite layer 21b is 1 nm or more and 10 nm or less.

[0042] In such a case, the first coating layer 21 can have improved hardness. This can improve the strength of the first coating layer 21. As a result, the service life of the coated tool 1 can be extended.

[0043] As shown in FIG. 5B, the first layer 31 included in the second coating layer 22 may have a region in which a plurality of composite layers 31a and a plurality of composite layers 31b are alternately layered. Here, a Ti / Al ratio and a Cr / Al ratio in the composite layer 31a are different from a Ti / Al ratio and a Cr / Al ratio in the composite layer 31b, respectively. For example, the Ti / Al ratio in the composite layer 31a is larger than the Ti / Al ratio in the composite layer 31b, and the Cr / Al ratio in the composite layer 31b is larger than the Cr / Al ratio in the composite layer 31a. An average of the thicknesses of the composite layer 31a and the composite layer 31b is 1 nm or more and 10 nm or less.

[0044] In such a case, the hardness of the first layer 31 and, accordingly, the hardness of the second coating layer 22 can be improved. This can improve the strength of the first layer 31 and, accordingly, the strength of the second coating layer 22. This can extend the service life of the coated tool 1.

[0045] As shown in FIG. 5B, the second layer 32 included in the second coating layer 22 may have a region in which a plurality of composite layers 32a and a plurality of composite layers 32b are alternately layered. Here, a Ti / Al ratio and a Cr / Al ratio in the composite layer 32a are different from a Ti / Al ratio and a Cr / Al ratio in the composite layer 32b, respectively. For example, the Cr / Al ratio in the composite layer 32a is larger than the Cr / Al ratio in the composite layer 32b, and the Ti / Al ratio in the composite layer 32b is larger than the Ti / Al ratio in the composite layer 32a. An average of the thicknesses of the composite layer 32a and the composite layer 32b is 1 nm or more and 10 nm or less.

[0046] In such a case, the hardness of the second layer 32 and, accordingly, the hardness of the second coating layer 22 can be improved. This can improve the strength of the second layer 32 and, accordingly, the strength of the second coating layer 22. As a result, the service life of the coated tool 1 can be extended.

[0047] As shown in FIG. 5C, the third layer 33 included in the third coating layer 23 may have a region where a plurality of composite layers 33a and a plurality of composite layers 33b are alternately layered. Here, a Ti / Al ratio and a Cr / Al ratio in the composite layer 33a are different from a Ti / Al ratio and a Cr / Al ratio in the composite layer 33b, respectively. For example, the Ti / Al ratio in the composite layer 33a is larger than the Ti / Al ratio in the composite layer 33b, and the Cr / Al ratio in the composite layer 33b is larger than the Cr / Al ratio in the composite layer 33a. An average of the thicknesses of the composite layer 33a and the composite layer 33b is 1 nm or more and 10 nm or less.

[0048] In such a case, the hardness of the third layer 33 and, accordingly, the hardness of the third coating layer 23 can be improved. This can improve the strength of the third layer 33 and, accordingly, the strength of the third coating layer 23. This can extend the service life of the coated tool 1.

[0049] As shown in FIG. 5C, the fourth layer 34 included in the third coating layer 23 may have a region where a plurality of composite layers 34a and a plurality of composite layers 34b are alternately layered. Here, a Ti / Al ratio and a Cr / Al ratio in the composite layer 34a are different from a Ti / Al ratio and a Cr / Al ratio in the composite layer 34b, respectively. For example, the Cr / Al ratio in the composite layer 34a is larger than the Cr / Al ratio in the composite layer 34b, and the Ti / Al ratio in the composite layer 34b is larger than the Ti / Al ratio in the composite layer 34a. An average value of the thicknesses of the composite layer 34a and the composite layer 34b is 1 nm or more and 10 nm or less.

[0050] In such a case, the hardness of the fourth layer 34 and, accordingly, the hardness of the third coating layer 23 can be improved. This improves the strength of the fourth layer 34 and the strength of the third coating layer 23. As a result, the service life of the coated tool 1 can be extended.

[0051] The ratio of the elements in the coating layer or the layer contained in the coating layer 20A can be identified, for example, by an analysis based on X-ray photoelectron spectroscopy (XPS) or by an analysis using an energy-dispersive X-ray spectrometer (EDS) connected to a scanning transmission electron microscope (STEM). The presence of the plurality of composite layers alternately layered in the layer contained in the coating layer 20A can be confirmed by a bright-field image or a high-angle annular dark-field image obtained by a scanning transmission electron microscope (STEM) or by an analysis using an energy-dispersive X-ray spectrometer (EDS). Intermediate layer 11

[0052] As in Fig.3, an intermediate layer 11 may be disposed between the base body 10 and the coating layer 20A serving as the coating layer 20. Specifically, the intermediate layer 11 has one surface (here, a lower surface) in contact with the upper surface of the base body 10 and another surface (here, an upper surface) in contact with the lower surface of the coating layer 20A (for example, the first coating layer 21).

[0053] The intermediate layer 11 has higher adhesion to the base body 10 than the coating layer 20A. Examples of metal elements with such properties include Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si, Y, and Ti. The intermediate layer 11 contains at least one metal element from the above metal elements. For example, the intermediate layer 11 may contain Ti. Si is a metalloid element, but in the present description, metalloid elements are also considered to be included in metal elements.

[0054] When the intermediate layer 11 contains Ti, a content percentage of Ti in the intermediate layer 11 may be 1.5 atomic % or more. For example, the content percentage of Ti in the intermediate layer 11 may be 2 atomic % or more.

[0055] The intermediate layer 11 may contain components other than the above-described metal elements (Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si, Y, and Ti). However, in terms of adhesion to the base body 10, the intermediate layer 11 may contain at least 95 atomic % or more of the above-mentioned metal elements in a combined amount. The intermediate layer 11 may contain 98 atomic % or more of the above-mentioned metal elements in a combined amount. The ratio of the metal components in the intermediate layer 11 can be determined, for example, by analysis using an energy dispersive X-ray spectrometer (EDS) connected to a scanning transmission electron microscope (STEM).

[0056] Therefore, if the intermediate layer 11, which has higher wettability with the base body 10 than the coating layer 20A, is provided between the base body 10 and the coating layer 20A, the adhesion between the base body 10 and the coating layer 20A can be improved. Since the intermediate layer 11 also has high adhesion to the coating layer 20A, the coating layer 20A is less likely to be separated from the intermediate layer 11.

[0057] The thickness of the intermediate layer 11 may be, for example, 0.1 nm or more and less than 20 nm. Coating layer 20B according to the second embodiment

[0058] A specific configuration of the coating layer 20B according to a second embodiment will be described with reference to FIG. Fig. 6, Fig. 7A, Fig. 7B and Fig. 8 described. Fig.Fig. 6 is a cross-sectional view showing an example of the coating layer according to the second embodiment. Fig. 7A is a schematic view describing a Ti / Al ratio in the coating layer according to the second embodiment. Fig. 7B is a schematic view describing a Cr / Al ratio in the coating layer according to the second embodiment. Fig. 8 is a cross-sectional view showing an example of a fourth coating layer included in the coating layer according to the second embodiment.

[0059] As in Fig.6, the coating layer 20B according to the second embodiment differs from the coating layer 20A according to the first embodiment in that the coating layer 20B according to the second embodiment further includes a fourth coating layer 24 disposed on the third coating layer 23. The coating layer 20B according to the second embodiment, which is the same and / or similar in configuration to the coating layer 20A according to the first embodiment, will not be described. Fourth coating layer 24

[0060] As in Fig. 6, the fourth coating layer 24 has a fifth layer 35 and a sixth layer 36.

[0061] The fifth layer 35 contains Al, Ti, and N. The fifth layer 35 may, for example, be an AlTiN layer containing AlTiN, which is a nitride of Al and Ti. Note that the term "AlTiN" means that Al, Ti, and N are present in any ratio and does not necessarily mean that Al, Ti, and N are present in a 1:1:1 ratio. The fifth layer 35 may further contain Cr. In such a case, the fifth layer 35 may, for example, be an AlTiCrN layer containing AlTiCrN, which is a nitride of Al, Ti, and Cr. The fifth layer 35 has a thickness of, for example, 200 nm or more and 400 nm or less.

[0062] The sixth layer 36 contains Al, Cr, and N. The sixth layer 36 may, for example, be an AlCrN layer containing AlCrN, which is a nitride of Al and Cr. Note that the term "AlCrN" means that Al, Cr, and N are present in any ratio and does not necessarily mean that Al, Cr, and N are present in a 1:1:1 ratio. The sixth layer 36 may further contain Ti. In such a case, the sixth layer 36 may, for example, be an AlTiCrN layer containing AlTiCrN, which is a nitride of Al, Ti, and Cr. The sixth layer 36 has a thickness of, for example, 200 nm or more and 400 nm or less.

[0063] The fifth layer 35 has a Ti / Al ratio that is greater than the Ti / Al ratio in the third layer 33. Here, the Ti / Al ratio refers to a ratio of the number of Ti atoms to the number of Al atoms. This can further improve the wear resistance and chipping resistance of the coating layer 20B. The fifth layer 35 may have a Cr / Al ratio that is lower than the Cr / Al ratio in the third layer 33.

[0064] The sixth layer 36 has a Cr / Al ratio that is greater than the Cr / Al ratio in the fourth layer 34. Here, the Cr / Al ratio refers to a ratio of the number of Cr atoms to the number of Al atoms. This can further improve the lubricity and anti-adhesion properties of the coating layer 20B. The sixth layer 36 may have a Ti / Al ratio that is lower than the Ti / Al ratio in the fourth layer 34.

[0065] The fourth coating layer 24 can further improve the wear resistance and chipping resistance of the coating layer 20B, and also further improve the lubricity and non-stick properties of the coating layer 20A. This further extends the service life of the coated tool 1.

[0066] In the coating layer 20B, the third coating layer 23 acts so as not to significantly increase the residual stresses between the base body 10 and the fourth coating layer 24, which serves as a coating layer arranged on the third coating layer 23.

[0067] A Ti / Al ratio in the fifth layer 35 can be 1 or more and 1.5 or less. When the Ti / Al ratio in the fifth layer 35 is 1 or more, the coating layer 20B can have improved wear and chipping resistance. When the Ti / Al ratio in the fifth layer 35 is 1.5 or less, a significant increase in residual stresses between the base body 10 and the coating layer 20B is avoided. This reduces the separation or cracking between the base body 10 and the coating layer 20B. This further extends the service life of the coated tool 1.

[0068] The Cr / Al ratio in the sixth layer 36 can be 1 or more and 1.5 or less. When the Cr / Al ratio in the sixth layer 36 is 1 or more, the coating layer 20B can have improved lubricating and anti-adhesion properties. When the Cr / Al ratio in the sixth layer 36 is 1.5 or less, a significant increase in residual stresses between the base body 10 and the coating layer 20B is avoided. This reduces the separation or cracking between the base body 10 and the coating layer 20B. This further extends the service life of the coated tool 1. Example of the Ti / Al ratio in the coating layer 20B

[0069] As shown in Fig. 7A, the Ti / Al ratio in the coating layer 20B may continuously change in the thickness direction of the coating layer 20B. If the Ti / Al ratio is not constant in the target region of the coating layer 20B, the average value of the Ti / Al ratios in such a region may be used as the Ti / Al ratio in the region.

[0070] In the Fig. In the example shown in Figure 7A, the Ti / Al ratio in the coating layer 20B is also locally maximum in the fifth layer 35 contained in the fourth coating layer 24. The Ti / Al ratio in the coating layer 20B is also locally minimum in the sixth layer 36 contained in the fourth coating layer 24.

[0071] Here, a local maximum value of the Ti / Al ratio in the fifth layer 35 is larger than a local maximum value of the Ti / Al ratio in the third layer 33. On the other hand, a local minimum value of the Ti / Al ratio in the sixth layer 36 is smaller than a local minimum value of the Ti / Al ratio in the fourth layer 34. For example, the local minimum value of the Ti / Al ratio in the sixth layer 36 is substantially 0. Example of the Cr / Al ratio in the coating layer 20B

[0072] As in Fig. As shown in Fig. 7B, the Cr / Al ratio in the coating layer 20B may change continuously in the thickness direction of the coating layer 20B. If the Cr / Al ratio is not constant in the target region of the coating layer 20B, an average value of the Cr / Al ratios in such a region may be used as the Cr / Al ratio in the region.

[0073] In the Fig.In the example shown in Figure 7B, the Cr / Al ratio in the coating layer 20B is also locally maximum in the sixth layer 36 contained in the fourth coating layer 24. The Cr / Al ratio in the coating layer 20B is also locally minimum in the fifth layer 35 contained in the fourth coating layer 24.

[0074] Here, a local maximum value of the Cr / Al ratio in the sixth layer 36 is larger than a local maximum value of the Cr / Al ratio in the fourth layer 34. On the other hand, a local minimum value of the Cr / Al ratio in the fifth layer 35 is smaller than a local minimum value of the Cr / Al ratio in the third layer 33. For example, the local minimum value of the Cr / Al ratio in the fifth layer 35 is substantially 0.

[0075] Although the coating layer 20B in which the first coating layer 21, the first layer 31, the second layer 32, the third layer 33, the fourth layer 34, the fifth layer 35, and the sixth layer 36 are sequentially layered on the base body 10 is provided, the first coating layer 21, the second layer 32, the first layer 31, the fourth layer 34, the third layer 33, the sixth layer 36, and the fifth layer 35 may be sequentially layered on the base body 10. Example of the fourth coating layer 24

[0076] As in Fig.As shown in FIG. 8, the fifth layer 35 included in the fourth coating layer 24 may have a region where a plurality of composite layers 35a and a plurality of composite layers 35b are alternately layered. Here, a Ti / Al ratio in the composite layers 35a differs from a Ti / Al ratio in the composite layers 35b. For example, the Ti / Al ratio in the composite layers 35a is larger than the Ti / Al ratio in the composite layers 35b. An average of the thicknesses of the composite layer 35a and the composite layer 35b is 1 nm or more and 10 nm or less.

[0077] In such a case, the fifth layer 35 and, accordingly, the fourth coating layer 24 may have improved hardness. In particular, the fourth coating layer 24 may have improved hardness at a high temperature. As a result, the fifth layer 35 and, accordingly, the fourth coating layer 24 may have improved strength. In particular, the fourth coating layer 24 may have improved wear resistance. This further extends the service life of the coated tool 1.

[0078] As in Fig.As shown in FIG. 8, the sixth layer 36 included in the fourth coating layer 24 may have a region where a plurality of composite layers 36a and a plurality of composite layers 36b are alternately layered. Here, a Cr / Al ratio in the composite layers 36a differs from a Cr / Al ratio in the composite layers 36b. For example, the Cr / Al ratio in the composite layers 36a is greater than the Cr / Al ratio in the composite layers 36b. An average of the thicknesses of the composite layer 36a and the composite layer 36b is 1 nm or more and 10 nm or less.

[0079] In such a case, the sixth layer 36 and, accordingly, the fourth coating layer 24 may have improved hardness. In particular, the fourth coating layer 24 may have improved hardness at a high temperature. As a result, the sixth layer 36 and, accordingly, the fourth coating layer 24 may have improved strength. In particular, the fourth coating layer 24 may have improved wear resistance. This further extends the service life of the coated tool 1. Method for producing a coated tool

[0080] With reference to Fig. 9, an example of a method for manufacturing the coated tool 1 according to the embodiment will be described. Fig.9 is a diagram schematically showing an example of a deposition apparatus for forming a coating layer on a base body. The method for manufacturing the coated tool 1 is not limited to the method described below.

[0081] First, the base body 10 is manufactured with a mold of the coated tool 1 using a known method. Subsequently, the coating layer 20 is formed on the surface of the base body 10. For example, physical vapor deposition (PVD), such as ion plating or sputtering, can be used to deposit the coating layer 20. When the coating layer 20 is formed by ion plating, for example, an arc ion plating deposition apparatus (hereinafter referred to as an AIP apparatus) 1000 as shown in Fig. 9 shown.

[0082] In the AIP device 1000, which is Fig. As shown in Figure 9, a gas such as N2 or Ar is introduced into a vacuum chamber 101 from a gas inlet 102, and a high voltage is applied between a cathode electrode 103 and an anode electrode 104 located in the AIP apparatus 1000 to generate a gas plasma. Such a plasma vaporizes and ionizes a desired metal or ceramic from a target 105 to generate metal or ceramic ions in a high-energy state. By adhering the ionized metal or ionized ceramic to the surface of the base body 10 as a sample, the surface of the base body 10 is coated with the coating layer 20.

[0083] As in Fig. 9, a tower 107, on which several base bodies 10 are seated, can be placed on a sample carrier 106. A plurality of sample carriers 106 (two sets in the figure) can be placed on a table (not shown). As shown in Fig.9, a heater 108 for heating the base bodies 10, a gas outlet 109 for discharging gas from the system and a bias energy supply device 110 for applying a bias voltage to the base bodies 10 are further provided.

[0084] Examples of the target 105 to be used may include a metal target independently containing metallic aluminum (Al), metallic titanium (Ti), metallic chromium (Cr), an alloy target obtained by combining these metals, and a mixed target comprising a powder or sintered body of these nitrides. For example, as the target 105, a first alloy target obtained by combining Al and Ti and a second alloy target obtained by combining Al and Cr may be used.

[0085] A metal source is evaporated by arc discharge or glow discharge by using the target 105 to ionize the metal of the metal source and simultaneously reacting with nitrogen gas (N2) from the nitrogen source to deposit the coating layer 20 on the surface of the base body 10.

[0086] At this time, the sample carrier 106 is controlled so that the distance between the position of the target 105 and the position of the base body 10 is 160 mm or more, for example, 260 mm or more. A large number of highly linear magnetic force lines are generated from a central portion of a surface of the target 105 toward the base body 10, so that a magnetic flux density near the base body 10 is 0.2 to 0.8 millitesla (mT).

[0087] Nitrogen gas as a reaction gas can be introduced into the AIP apparatus 1000 to create an atmospheric pressure of 2 to 10 Pa. The temperature of the base body 10 is maintained at 300 to 500 °C. Furthermore, a bias voltage of -50 to -200 V is applied to the base body 10 to generate an arc discharge of 30 to 200 A between the target 105 (cathode electrode 103) and the anode electrode 104. During this time, metal is deposited on the base body 10 while the base body 10 is rotated and turned.

[0088] Here, when each coating layer included in the coating layer 20 is laminated on the base body 10, a current value of the arc discharge generated between the target 105 serving as the cathode electrode 103 and the anode electrode 104 is controlled. For example, the current value of the arc discharge generated between the anode electrode 104 and the first alloy target obtained by combining Al and Ti and serving as the cathode electrode 103, or the second alloy target obtained by combining Al and Cr and serving as the cathode electrode 103, is controlled.

[0089] For example, in order to increase (decrease) the Ti / Al ratio in the coating layer or the layer included in the coating layer 20, the current value of the arc discharge generated between the first alloy target obtained by combining Al and Ti and serving as the cathode electrode 103 and the anode electrode 104 is increased (or decreased).

[0090] For example, in order to increase (decrease) the Cr / Al ratio in the coating layer or the layer included in the coating layer 20, the current value of the arc discharge generated between the second alloy target obtained by combining Al and Cr and serving as the cathode electrode 103 and the anode electrode 104 is increased (or decreased).

[0091] The magnetic flux density near the base body 10 can be controlled by controlling the magnetic field, for example, by installing an electromagnetic coil or a permanent magnet, which is a magnetic field generation source, near the target 105, by placing a permanent magnet within the AIP device 1000, for example, in its central portion, or by adjusting the position of the target 105 adjacent to the base body 10.

[0092] The magnetic force is calculated by measuring the magnetic flux density at the position of the base body 10 with a magnetic flux density meter. The magnetic flux density is expressed in millitesla (mT). The distance from the position of the target 105 to the position of the base body 10 represents a distance measured at a position where the base body 10 is closest to the target 105 and a distance where the base body 10 is farthest from the target 105.

[0093] If during deposition a period in which the base body 10 comes closest to and faces the target 105 at each position of the base body 10, as shown in Fig.9 is a rotation speed of the sample, the period of the difference in composition between the heavy metal and the light metal in the thickness direction of the coating layer 20 can be adjusted by adjusting the rotation speed. More specifically, the rotation speed of the base body 10 and the sample carrier 106 can be adjusted to achieve a period of 2 to 20 revolutions per minute (rpm).

[0094] During deposition, each of the sample carriers 106 on which the base bodies 10 are placed rotates while the tower 107 rotates, and the stage can be rotated so that the majority of the sample carriers 106 rotate. By setting such a rotation control time, the thickness of each composite layer comprising the first coating layer 21, the second coating layer 22 (the first layer 31 and the second layer 32), the third coating layer 23 (the third layer 33 and the fourth layer 34), and the fourth coating layer 24 (the fifth layer 35 and the sixth layer 36) can be controlled.

[0095] By applying the pulsed bias voltage, the time during which or the distance over which metal ions fly from the target 105 to the base bodies 10 can be adjusted. Thus, a difference in the composition between the heavy metal component and the light metal component can be created even during deposition.

[0096] For example, if the base body 10 is placed near and facing the target 105, the heavy metal components will fly linearly from the target 105 to the base body 10, and the heavy metals will be deposited more heavily on the base body 10 than the light metals. However, if the base body 10 is placed away from the target 105 and not facing the target 105, the deposition amount of the heavy metal components is expected to decrease because the light metal components will move around the base body 10 and be deposited on it.At present, it is conceivable that increasing the distance from the position of the target 105 to the position of the base body 10 and maintaining a certain degree of magnetic flux density near the base body 10 promotes the movement of the light metal components and increases a difference in composition between the heavy metal components and the light metal components. Cutting tool

[0097] A configuration of a cutting tool having the above-described coated tool 1 will be described with reference to Fig. 10 described. Fig. 10 is a front view showing an example of the cutting tool according to the embodiment.

[0098] As in Fig. 10, a cutting tool 100 according to the embodiment includes the coated tool 1 and the holder 70 for fixing the coated tool 1.

[0099] The holder 70 is a rod-shaped element extending from a first end (upper end in Fig. 10) to a second end (lower end in Fig. 10). The holder 70 is made of steel or cast iron, for example. In particular, high-toughness steel can be used among these elements.

[0100] The holder 70 has a pocket 73 at one end portion on the first end side. The pocket 73 is a portion where the coated tool 1 is mounted. The pocket 73 has a seating surface intersecting the rotational direction of the workpiece and a retaining side surface inclined with respect to the seating surface. The seating surface is formed with a screw hole into which the screw 75 to be described below is screwed.

[0101] The coated tool 1 is arranged in the pocket 73 of the holder 70 and is fixed to the holder 70 with the 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 the screw hole formed in the seat surface of the pocket 73, so that the threaded portions are screwed together. Thus, the coated tool 1 is mounted on the holder 70 such that a portion of the cutting edge 3 protrudes outward from the holder 70.

[0102] In the embodiment, a cutting tool used for the so-called turning process is described as an example. Examples of the turning process include drilling, external turning, and grooving. The cutting tool is not limited to a cutting tool used for the turning process. For example, the coated tool 1 can be used as a cutting tool used for the milling process. Examples of cutting tools used for the milling process include a milling cutter such as a plain milling cutter, a face milling cutter, a disc milling cutter, and a slotting cutter, as well as end mills such as a single-flute end mill, a multi-flute end mill, a tapered end mill, and a ball end mill. EXAMPLES

[0103] An example of the present disclosure will be specifically described below. The present disclosure is not limited to the following example.

[0104] A coated tool according to the example was manufactured by forming a coating layer on a WC-based cemented carbide alloy base body using an AIP apparatus as described in Fig. 9. As a target, a first alloy target obtained by combining Al and Ti and a second alloy target obtained by combining Al and Cr were used. The metal ions generated from the first alloy target or the second alloy target were reacted with nitrogen gas to deposit the coating layer on the base body.

[0105] Here, when the base body was rotated and rotated and the coating layer was stacked on the base body, a current value of an arc discharge generated between the first alloy target or the second alloy target serving as a cathode electrode and an anode electrode was controlled as follows.

[0106] First, the current value of the arc discharge generated between the first alloy target and the anode electrode was set to 200 A, and the current value of the arc discharge generated between the second alloy target and the anode electrode was set to 200 A, so that the first coating layer was layered on the base body.

[0107] Next, the current value of the arc discharge generated between the first alloy target and the anode electrode was set to 100 A, and the current value of the arc discharge generated between the second alloy target and the anode electrode was set to 50 A, so that the first layer included in the second coating layer was coated on the first coating layer.

[0108] Subsequently, the current value of the arc discharge generated between the first metal target and the anode electrode was set to 50 A, and the current value of the arc discharge generated between the second metal target and the anode electrode was set to 100 A, so that the second layer included in the second coating layer was coated on the first layer.

[0109] Next, the current value of the arc discharge generated between the first alloy target and the anode electrode was set to 120 A, and the current value of the arc discharge generated between the second alloy target and the anode electrode was set to 30 A, so that the third layer included in the third coating layer was layered on the second layer.

[0110] Subsequently, the current value of the arc discharge generated between the first alloy target and the anode electrode was set to 30 A, and the current value of the arc discharge generated between the second alloy target and the anode electrode was set to 120 A, so that the fourth layer included in the third coating layer was laminated on the third layer.

[0111] Next, the current value of the arc discharge generated between the first alloy target and the anode electrode was set to 150 A, and the current value of the arc discharge generated between the second alloy target and the anode electrode was set to 0 A, so that the fifth layer included in the fourth coating layer was laminated on the fourth layer.

[0112] Finally, the current value of the arc discharge generated between the first alloy target and the anode electrode was set to 0 A, and the current value of the arc discharge generated between the second alloy target and the anode electrode was set to 150 A, so that the sixth layer included in the third coating layer was applied to the fifth layer.

[0113] The coated tool thus produced was examined by X-ray photoelectron spectroscopy (XPS) for elements contained in the coating layer or layer deposited on the base body.

[0114] It was confirmed that each of the first layer and the second layer contained in the first coating layer and the second coating layer, and the third layer and the fourth layer contained in the third coating layer, contained Al, Ti, Cr, and N. It was confirmed that the fifth layer contained in the fourth coating layer contained Al, Ti, and N. It was confirmed that the sixth layer contained in the fourth coating layer contained Al, Cr, and N.

[0115] It was confirmed that the Ti / Al ratios in the first coating layer, the first layer, the second layer, the third layer, the fourth layer, the fifth layer, and the sixth layer changed continuously with respect to the distance from the substrate surface in the thickness direction of the coating layer or layer, that is, in the direction perpendicular to the substrate surface. It was confirmed that the Cr / Al ratios in the first coating layer, the first layer, the second layer, the third layer, the fourth layer, the fifth layer, and the sixth layer changed continuously with respect to the distance from the substrate surface in the thickness direction of the coating layer or layer, that is, in the direction perpendicular to the substrate surface.

[0116] It was confirmed that the Ti / Al ratio (local maximum value: 0.8) in the first layer was larger than the Ti / Al ratio (0.6) in the first coating layer. It was confirmed that the Cr / Al ratio (local maximum value: 0.8) in the second layer was larger than the Cr / Al ratio (0.6) in the first coating layer. It was confirmed that the Ti / Al ratio (local maximum value: 1) in the third layer was larger than the Ti / Al ratio (local maximum value: 0.8) in the first layer. It was confirmed that the Cr / Al ratio (local maximum value: 1) in the fourth layer was larger than the Cr / Al ratio (local maximum value: 0.8) in the second layer. It was confirmed that the Ti / Al ratio (local maximum value: 1.4) in the fifth layer was larger than the Ti / Al ratio (local maximum value: 1) in the third layer.It was confirmed that the Cr / Al ratio (local maximum value: 1.2) in the sixth layer was larger than the Cr / Al ratio (local maximum value: 1) in the fourth layer.

[0117] The fifth and sixth layers were subjected to elemental analysis using an energy-dispersive X-ray spectrometer (EDS). Bright-field images and annular high-angle dark-field images of the fifth and sixth layers were acquired using a scanning transmission electron microscope (STEM).

[0118] It was confirmed that the fifth layer had a region where a plurality of first composite layers and a plurality of second composite layers were alternately layered, and the sixth layer had a region where a plurality of third composite layers and a plurality of fourth composite layers were alternately layered. It was confirmed that the Ti / Al ratio in the first composite layer was different from the Ti / Al ratio in the second composite layer, and the Cr / Al ratio in the third composite layer was different from the Cr / Al ratio in the fourth composite layer. Cutting test

[0119] Cutting tests were conducted on the coated tool according to Example 1 and on coated tools according to conventional products (a conventional product 1, a conventional product 2, and a conventional product 3) as comparative examples. The test conditions for the cutting tests were as follows. Cutting tests were conducted under the following conditions using a cemented carbide grade for drilling (model number: 2ZDK060-HP-OH (with internal coolant supply type), φ6 mm) as the base body. (1) Cutting method: drilling (2) Workpiece: S50C (3) Cutting speed Vc: 100 m / min (4) Feed per revolution f: 0.13 mm / rev (5) Axial cutting depth H: 12 mm (6) Processing mode: Wet (7) Evaluation method: Under the above conditions, the base body was drilled, and the maximum wear amount (mm) of a cutting edge of the coated tool was measured relative to the number of holes formed in the workpiece. The maximum wear amount of the cutting edge was defined as the maximum value of the depth from the surface of a flank of the cutting edge to a portion where wear was observed.

[0120] Table 1 shows the maximum wear amounts of the cutting edges of the coated tools according to Example and the coated tools according to the conventional products (the conventional product 1, the conventional product 2 and the conventional product 3) depending on the number of holes formed in the workpiece. [Table 1] Number of holes Maximum wear of the cutting edge (mm) Example 308 0,018 616 0,028 924 0,035 1232 0,050 Conventional Product 1 308 0,040 616 0,100 Conventional Product 2 308 0,035 616 0,052 924 0,065 1232 0,075 Conventional Product 3 308 0,043 616 0,050 924 0,060 1232 0,075

[0121] As shown in Table 1, the maximum wear amount of the cutting edge of the coated tool according to the example with respect to the number of holes formed in the workpiece is smaller than the maximum wear amounts of the cutting edges of the coated tools according to the conventional products (the conventional product 1, the conventional product 2, and the conventional product 3) with respect to the same number of holes formed in the workpiece. Therefore, when comparing the coated tool according to the example with the coated tools according to the conventional products (the conventional product 1, the conventional product 2, and the conventional product 3), it was confirmed that the coated tool according to the example improved the wear resistance of the coated tool.

[0122] In the coated tool according to Conventional Product 1, significant chipping occurred at the corner portion of the coated tool when the number of holes was 616. On the other hand, significant chipping did not occur in the coated tool according to Example. Therefore, it was confirmed that the coated tool according to Example could maintain the chipping resistance of the coated tool.

[0123] As described above, the coated tool (for example, the coated tool 1) according to the embodiment includes the base body (for example, the base body 10), the first coating layer (for example, the first coating layer 21) disposed on the base body, the second coating layer (for example, the second coating layer 22) disposed on the first coating layer, and the third coating layer (for example, the third coating layer 23) disposed on the second coating layer. The first coating layer contains Al, Ti, Cr, and N. The second coating layer includes the first layer (for example, the first layer 31) and the second layer (for example, the second layer 32). The first layer contains Al, Ti, Cr, and N and has a Ti / Al ratio that is larger than the Ti / Al ratio in the first coating layer.The second layer contains Al, Ti, Cr, and N and has a Cr / Al ratio that is greater than the Cr / Al ratio in the first coating layer. The third coating layer comprises the third layer (for example, the third layer 33) and the fourth layer (for example, the fourth layer 34). The third layer contains Al, Ti, Cr, and N and has a Ti / Al ratio that is greater than the Ti / Al ratio in the first layer. The fourth layer contains Al, Ti, Cr, and N and has a Cr / Al ratio that is greater than the Cr / Al ratio in the second layer.

[0124] Therefore, the coated tool according to the embodiment can extend the tool life.

[0125] The shape of the coated tool 1, which is Fig.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 include a body having, for example, a rotation axis and a rod-like shape extending from a first end to a second end, a cutting edge disposed at the first end of the body, and a groove extending helically from the cutting edge to the second end of the body. Supplementary NoteSupplementary Note (1):

[0126] A coated tool comprising: a basic body, a first coating layer arranged on the base body, a second coating layer disposed on the first coating layer, and a third coating layer disposed on the second coating layer, wherein the first coating layer contains Al, Ti, Cr and N, the second coating layer has: a first layer containing Al, Ti, Cr and N and having a Ti / Al ratio greater than the Ti / Al ratio in the first coating layer, and a second layer containing Al, Ti, Cr and N and having a Cr / Al ratio that is greater than the Cr / Al ratio in the first coating layer, wherein the third coating layer comprises: a third layer containing Al, Ti, Cr and N and having a Ti / Al ratio greater than the Ti / Al ratio in the first layer, and a fourth layer containing Al, Ti, Cr and N and having a Cr / Al ratio greater than the Cr / Al ratio in the second layer. Supplementary note (2):

[0127] The coated tool according to supplementary note (1), wherein a local maximum value of the Ti / Al ratio in the third layer is larger than a local maximum value of the Ti / Al ratio in the first layer. Supplementary note (3):

[0128] The coated tool according to supplementary note (1) or (2), wherein a local minimum value of the Ti / Al ratio in the fourth layer is smaller than a local minimum value of the Ti / Al ratio in the second layer. Supplementary note (4):

[0129] The coated tool according to any one of the supplementary notes (1) to (3), further comprising: a fourth coating layer disposed on the third coating layer, wherein the fourth coating layer has: a fifth layer containing Al, Ti and N and having a Ti / Al ratio that is greater than a Ti / Al ratio in the third layer, and a sixth layer containing Al, Cr and N and having a Cr / Al ratio greater than the Cr / Al ratio in the fourth layer. Supplementary note (5):

[0130] The coated tool according to supplementary note (4), wherein both the local maximum value of the Ti / Al ratio in the fifth layer and the local maximum value of the Cr / Al ratio in the sixth layer are 1 or more and 1.5 or less. Supplementary note (6):

[0131] The coated tool according to supplementary note (4) or (5), where the fifth layer has a region obtained by alternately stacking a plurality of first composite layers and a plurality of second composite layers, the sixth layer has a region obtained by alternately stacking a plurality of third composite layers and a plurality of fourth composite layers, a Ti / Al ratio in the plurality of first composite layers is different from a Ti / Al ratio in the plurality of second composite layers and a Cr / Al ratio in the majority of the third composite layers is different from a Cr / Al ratio in the majority of the fourth composite layers. Supplementary note (7):

[0132] The coated tool according to supplementary note (6), wherein a Ti / Al ratio in the majority of the first composite layers is higher than a Ti / Al ratio in the majority of the second composite layers, and a Cr / Al ratio in the majority of the third composite layers is higher than a Cr / Al ratio in the majority of the fourth composite layers. Supplementary note (8):

[0133] A cutting tool comprising: a holder having a rod-like shape, the holder having a pocket at a portion of the end of the holder, and the coated tool according to any one of supplementary notes (1) to (7), wherein the coated tool is arranged in the pocket.

[0134] Further effects and / or variations can be readily devised by those skilled in the art. Therefore, various aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications are possible without departing from the spirit or scope of the general inventive concepts defined by the appended claims and their equivalents. REFERENCE SYMBOL 1 Coated tool 2 lace bodies 3 Cutting edge section 5 through hole 10 basic bodies 11 Intermediate layer 20, 20A, 20B coating layer 21 First coating layer 22 Second coating layer 23 Third coating layer 24 Fourth coating layer 31 First layer 32 Second layer 33 Third Layer 34 Fourth Layer 35 Fifth Layer 36 Sixth Layer 21a, 21b, 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b, 35a, 35b, 36a, 36b Composite layer 70 holders 73 Bag 75 screw 100 cutting tools 101 Vacuum Chamber 102 Gas inlet 103 Cathode electrode 104 Anode electrode 105 Target 106 Sample holder 107 Tower 108 Heating element 109 Gas outlet 110 Bias energy supply device 1000 AIP device QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2004-50381 A

[0002] JP 2018-30212 A

[0002]

Claims

[1] A coated tool comprising: a basic body, a first coating layer arranged on the base body, a second coating layer disposed on the first coating layer, and a third coating layer disposed on the second coating layer, wherein the first coating layer contains Al, Ti, Cr and N, the second coating layer has: a first layer containing Al, Ti, Cr and N and having a Ti / Al ratio that is greater than a Ti / Al ratio in the first coating layer, and a second layer containing Al, Ti, Cr and N and having a Cr / Al ratio that is greater than the Cr / Al ratio in the first coating layer, and the third coating layer has: a third layer containing Al, Ti, Cr and N and having a Ti / Al ratio greater than the Ti / Al ratio in the first layer, and a fourth layer containing Al, Ti, Cr and N and having a Cr / Al ratio greater than the Cr / Al ratio in the second layer. [2] The coated tool according to claim 1, wherein a local maximum value of the Ti / Al ratio in the third layer is larger than a local maximum value of the Ti / Al ratio in the first layer. [3] The coated tool according to claim 1 or 2, wherein a local minimum value of the Ti / Al ratio in the fourth layer is smaller than a local minimum value of the Ti / Al ratio in the second layer. [4] The coated tool according to any one of claims 1 to 3, further comprising: a fourth coating layer disposed on the third coating layer, wherein the fourth coating layer has: a fifth layer containing Al, Ti and N and having a Ti / Al ratio that is greater than a Ti / Al ratio in the third layer, and a sixth layer containing Al, Cr and N and having a Cr / Al ratio greater than a Cr / Al ratio in the fourth layer. [5] The coated tool according to claim 4, wherein each of a local maximum value of the Ti / Al ratio in the fifth layer and a local maximum value of the Cr / Al ratio in the sixth layer is 1 or more and 1.5 or less. [6] The coated tool according to claim 4 or 5, wherein the fifth layer has a region obtained by alternately stacking a plurality of first composite layers and a plurality of second composite layers, the sixth layer has a region obtained by alternately stacking a plurality of third composite layers and a plurality of fourth composite layers, a Ti / Al ratio in the plurality of first composite layers is different from a Ti / Al ratio in the plurality of second composite layers and a Cr / Al ratio in the plurality of third composite layers is different from a Cr / Al ratio in the plurality of fourth composite layers. [7] The coated tool according to claim 6, wherein a Ti / Al ratio in the plurality of first composite layers is greater than a Ti / Al ratio in the plurality of second composite layers and a Cr / Al ratio in the majority of the third composite layers is greater than a Cr / Al ratio in the majority of the fourth composite layers. [8] A cutting tool comprising: a holder having a rod-like shape, the holder having a pocket at an end portion of the holder, and the coated tool according to any one of claims 1 to 7, which is arranged in the pocket.

Images