WO2025211301A1 - Outil revêtu, outil de coupe et procédé de production d'objet coupé - Google Patents

Outil revêtu, outil de coupe et procédé de production d'objet coupé

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Publication number
WO2025211301A1
WO2025211301A1 PCT/JP2025/013024 JP2025013024W WO2025211301A1 WO 2025211301 A1 WO2025211301 A1 WO 2025211301A1 JP 2025013024 W JP2025013024 W JP 2025013024W WO 2025211301 A1 WO2025211301 A1 WO 2025211301A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating layer
needle
crystals
coated
heat treatment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2025/013024
Other languages
English (en)
Japanese (ja)
Inventor
陽子 加藤
賢作 渡邉
拓未 松巾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Publication of WO2025211301A1 publication Critical patent/WO2025211301A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material

Definitions

  • Embodiments of the present disclosure relate to methods for manufacturing coated tools, cutting tools, and machined products.
  • Coated tools which have improved wear resistance and other properties by coating the surface of a substrate made of cemented carbide, cermet, ceramic, or other material, are known as tools used in cutting processes such as turning and milling.
  • a coated tool that includes a substrate and a coating coated on the substrate surface, the coating including an intermediate film coated on the substrate surface and an oxide film coated on the intermediate film surface.
  • the intermediate film is made of at least one material selected from the group consisting of TiN, TiCN, TiAlN, TiAlZrN, TiAlCrN, and AlCrN.
  • the intermediate film has a cubic crystal structure.
  • a coated tool comprises a substrate and at least one coating layer located on the substrate, the coating layer containing at least one element selected from among elements of Groups 4, 5, and 6 of the periodic table, Al, and Si, and at least one element selected from among C and N, and the coating layer contains needle-like crystals after heat treatment at a temperature of 1050°C or higher and 1100°C or lower in an air atmosphere, with at least some of the needle-like crystals located on the surface of the coating layer.
  • FIG. 1 is a perspective view showing an example of a coated tool according to the present embodiment.
  • FIG. 2 is a cross-sectional view showing an example of an insert according to this embodiment.
  • FIG. 3 is a schematic diagram illustrating an example of the coating layer according to this embodiment.
  • FIG. 4 is a front view showing an example of a cutting tool according to this embodiment.
  • FIG. 5A is a schematic diagram showing one step of the method for manufacturing a machined product according to this embodiment.
  • FIG. 5B is a schematic diagram showing one step of the method for manufacturing a machined product according to this embodiment.
  • FIG. 5C is a schematic diagram showing one step of the method for manufacturing a machined product according to this embodiment.
  • 6 is a diagram showing an image of the surface of the coating layer of the coated tool of Sample No. 1 according to the example after heat treatment.
  • 7 is a diagram showing an image of the surface of the coating layer of the coated tool of Sample No. 7 according to the comparative example after heat treatment.
  • Coated tools which have improved wear resistance and other properties by coating the surface of a substrate made of cemented carbide, cermet, ceramic, or other material, are known as tools used in cutting processes such as turning and milling.
  • the coating layer 3 contains at least one element selected from the elements of Groups 4, 5, and 6 of the periodic table, aluminum (Al), and silicon (Si), as well as at least one element selected from carbon (C) and nitrogen (N).
  • the coating layer 3 contains Al a Ti b Nb c M d and at least one element selected from C and N.
  • M is at least one element selected from the elements of Groups 4, 5, and 6 of the periodic table excluding Ti and niobium (Nb), and Si.
  • the composition of the coating layer 3 may be (AlTiNbWSi)N.
  • the notation (AlTiNbWSi)N indicates the type of constituent elements and does not indicate that the atomic ratio of the constituent elements is equal.
  • the coating layer 3 does not necessarily need to contain M.
  • the composition of the coating layer 3 may be (AlTiNb)N.
  • the notation (AlTiNb)N indicates the type of constituent elements, but does not indicate that the atomic ratio of the constituent elements is equal.
  • the coating layer 3 has high hardness at high temperatures (e.g., 1100°C) and high oxidation resistance.
  • the thickness of the coating layer 3 may be 1 ⁇ m or more and 7 ⁇ m or less. In particular, if the thickness of the coating layer 3 is 1.5 ⁇ m or more, the performance of the coated tool 1 is more likely to be improved. If the thickness of the coating layer 3 is 3 ⁇ m or less, the chipping resistance of the coating layer 3 is more likely to be improved. Therefore, if the thickness of the coating layer 3 is 1.5 ⁇ m or more and 3 ⁇ m or less, the chipping resistance, etc. of the coating layer 3 is more likely to be improved.
  • At least the coating layer 3 included in the coated tool 1 is subjected to heat treatment in an air atmosphere at a temperature of 1050°C or higher and 1100°C or lower.
  • a heating device such as an air atmosphere electric furnace
  • the coated tool 1 including the coating layer 3 is heated in an air atmosphere to a temperature of 1050°C or higher and 1100°C or lower.
  • the coated tool 1 including the coating layer 3 may be heated in an air atmosphere for one hour from the start of heating until the temperature reaches 1050°C. Thereafter, it may be held at 1050°C for one minute. After holding at 1050°C for one minute, it may be furnace-cooled for a certain period of time.
  • the heat treatment disclosed herein is carried out in an air atmosphere, i.e., an atmosphere containing oxygen, and can cause an oxidation reaction of the coating layer 3.
  • an air atmosphere i.e., an atmosphere containing oxygen
  • an oxidation reaction can occur in the coating layer 3, making it possible to evaluate the properties of the coating layer 3 on the coated tool 1 in a state that is the same as or similar to the state of the coated tool 1 during cutting.
  • the heat treatment temperature is 1100°C or lower, it is possible to reduce the risk of the heat treatment causing deterioration of the substrate 2. As a result, it is possible to reduce the risk that the coating layer 3 will be affected by deterioration of the substrate 2 due to the heat treatment, and it is possible to evaluate the properties of the coating layer 3 on the coated tool 1.
  • the coating layer 3 may be polycrystalline. Before heat treatment, the coating layer 3 may be polycrystalline containing cubic crystals. Before heat treatment, the coating layer 3 may be polycrystalline with cubic crystals as the main component.
  • main component refers to polycrystalline material containing 90% or more by mass of cubic crystals.
  • FIG. 3 is a schematic diagram illustrating an example of the coating layer 3 according to this embodiment.
  • the coating layer 3 contains needle-shaped crystals 5 after heat treatment at a temperature of 1050°C or higher and 1100°C or lower in the air atmosphere.
  • the needle-shaped crystals 5 are crystals that have a length L in a first direction and a width W in a second direction perpendicular to the first direction on the surface of the coating layer 3, which are different. Therefore, the shape of the needle-shaped crystals 5 is not limited to a needle shape and may include, for example, a columnar shape. At least a portion of the needle-shaped crystals 5 is located on the surface of the coating layer 3.
  • the needle-shaped crystals 5 is located on the surface of the coating layer 3
  • the coating layer 3 contains needle-like crystals 5 after the heat treatment, and that at least some of the needle-like crystals 5 are located on the surface of the coating layer 3.
  • SEM scanning electron microscope
  • the content of needle-like crystals 5 in the coating layer 3 of the coated tool 1 after heat treatment may be 50 to 100%.
  • the content of needle-like crystals 5 in the coating layer 3 may be measured by the area ratio of the needle-like crystals 5 in an image of the surface of the coating layer 3.
  • the content of needle-like crystals 5 in the coating layer 3 can be determined, for example, using a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • an image of the surface of the coating layer 3 is obtained using the scanning electron microscope (SEM).
  • the proportion of the image of the needle-like crystals 5 contained in the image of the surface of the coating layer 3 is calculated using image processing software.
  • the proportion of the area of the needle-like crystals 5 contained in the image to the area of the entire image may be taken as the content of needle-like crystals 5 in the coating layer 3.
  • An example of image processing software is Mac-View.
  • the area of the image of the surface of the coating layer 3 may be, for example, 5 ⁇ m x 5 ⁇ m.
  • the content of needle-like crystals 5 in the coating layer 3 may be 1% or less before the heat treatment.
  • “1% or less” includes 0%.
  • the coating layer 3 may not contain any needle-like crystals 5 before the heat treatment.
  • the coating layer 3 may not contain any needle-like crystals 5 before the heat treatment, or the content of needle-like crystals 5 in the coating layer 3 before the heat treatment may be low.
  • the content of needle-like crystals 5 in the coating layer 3 exceeds at least 1% after the heat treatment. In other words, in the above cases, the content of needle-like crystals 5 in the coating layer 3 increases due to the heat treatment.
  • the oxidation reaction of the coating layer 3 before heat treatment tends to be reduced.
  • the oxidation resistance of the coated tool 1 including the coating layer 3 tends to be improved.
  • the coating layer 3 contains a plurality of needle-shaped crystals 5 after heat treatment.
  • the average aspect ratio of the needle-shaped crystals 5 contained in the coating layer 3 may be 2 or more and 10 or less.
  • the aspect ratio of the needle-shaped crystals 5 is defined as the length L of the needle-shaped crystals 5 in the longitudinal direction of the needle-shaped crystals 5 divided by the width W of the needle-shaped crystals 5 in the lateral direction of the needle-shaped crystals 5.
  • the average aspect ratio of the needle crystals 5 contained in the coating layer 3 can be determined, for example, using a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • image processing software is used to obtain the length L of the image of the needle crystals 5 in the longitudinal direction of the image of the needle crystals 5 contained in the image of the surface of the coating layer 3 and the width W of the image of the needle crystals 5 in the lateral direction of the image of the needle crystals 5.
  • the aspect ratio of the image of the needle crystals 5 is obtained by dividing the length L of the image of the needle crystals 5 in the longitudinal direction by the width W of the image of the needle crystals 5 in the lateral direction of the image of the needle crystals 5.
  • the average aspect ratio of the images of the needle crystals 5 obtained for the multiple images of the needle crystals 5 contained in the image of the surface of the coating layer 3 is calculated.
  • An example of image processing software is Mac-View.
  • the area of the image of the surface of the coating layer 3 may be, for example, 5 ⁇ m x 5 ⁇ m.
  • the average aspect ratio of the needle-like crystals 5 contained in the coating layer 3 is 2 or greater, it becomes easier to reduce the area of the coating layer 3 that comes into contact with the workpiece. This in turn makes it easier to reduce the cutting resistance of the coating layer 3 during cutting. As a result, it becomes easier to improve the adhesion resistance of the coated tool 1 to the workpiece.
  • the average aspect ratio of the needle-shaped crystals 5 contained in the coating layer 3 is 2 or greater, it becomes easier to increase the specific surface area of the coating layer 3 after cutting. As a result, it becomes easier to cool the coating layer 3 after cutting.
  • the average aspect ratio of the needle-shaped crystals 5 contained in the coating layer 3 is 2 or greater, cracks that may occur in the coating layer 3 due to impacts on the coating layer 3 during cutting are more easily deflected. Accordingly, crack bridging is more easily induced in the coating layer 3 that receives impacts during cutting. As a result, it becomes easier to improve the toughness of the coating layer 3 during cutting.
  • the average aspect ratio of the needle-like crystals 5 contained in the coating layer 3 is 10 or less, it becomes easier to reduce breakage of the needle-like crystals 5 that may occur due to impacts on the coating layer 3 during cutting. This makes it easier to stabilize the needle-like crystals 5 contained in the coating layer 3 during cutting.
  • Nb may promote the formation of an aluminum oxide film that coats the surfaces of the needle-like crystals 5.
  • the coating layer 3 contains Al and W
  • a layer containing aluminum oxide and tungsten oxide is more likely to form inside the aluminum oxide film that coats the surface of the needle-shaped crystals 5.
  • it is easier to improve the adhesion of the aluminum oxide film to the inside of the needle-shaped crystals 5.
  • it is easier to further improve the oxidation resistance of the coated tool 1 that includes the coating layer 3.
  • Such a layer makes it easier to improve the heat resistance of the needle-shaped crystals 5. Because the needle-shaped crystals 5 are included in the coating layer 3, it is easier to improve the heat resistance of the coated tool 1 that includes the coating layer 3.
  • partial substitution of Ti by Al is promoted in the Ti-containing crystals. Accordingly, the hardness of the coating layer 3 is likely to be increased. This makes it easier to improve the wear resistance of the coated tool 1 including the coating layer 3.
  • the generation of aluminum oxide on the surface of the needle-like crystals 5 may be further promoted. This makes it easier to further reduce the oxidation reaction of the coating layer 3 during heat treatment. As a result, it makes it easier to further improve the oxidation resistance of the coated tool 1 including the coating layer 3.
  • the coating layer 3 contains Al and Ti, and the ratio of the Al content at the surface of the coating layer 3 to the Ti content at the surface of the coating layer 3 may be 2 or more after heat treatment.
  • partial substitution of Ti by Al is promoted in the Ti-containing crystals on the surface of the coating layer 3. Accordingly, the hardness of the surface of the coating layer 3 is likely to be increased. This makes it easier to improve the wear resistance of the coated tool 1 including the coating layer 3.
  • the formation of aluminum oxide on the surface of the needle-like crystals 5 located on the surface of the coating layer 3 is further promoted. The aluminum oxide formed on the surface of the needle-like crystals 5 tends to reduce the diffusion of oxygen into the coating layer 3. This makes it easier to further reduce the oxidation reaction of the coating layer 3. As a result, it makes it easier to further improve the oxidation resistance of the coated tool 1 including the coating layer 3.
  • the coating layer 3 contains Al and Ti, and the ratio X of the Al content in the coating layer 3 to the Ti content in the coating layer 3 before the heat treatment, and the ratio Y of the Al content in the coating layer 3 to the Ti content in the coating layer 3 after the heat treatment may satisfy the relationship Y/X > 2. In other words, the ratio of the Al content in the coating layer 3 to the Ti content in the coating layer 3 may increase due to the heat treatment.
  • the heat treatment promotes the partial substitution of Ti by Al in the Ti-containing crystals. Accordingly, the heat treatment makes it easier to increase the hardness of the coating layer 3. This makes it easier to improve the wear resistance of the coated tool 1 including the coating layer 3.
  • the heat treatment causes an oxidation reaction in the coating layer 3, which further promotes the formation of aluminum oxide on the surface of the needle-like crystals 5.
  • the aluminum oxide formed on the surface of the needle-like crystals 5 tends to reduce the diffusion of oxygen into the coating layer 3 during heat treatment. This makes it easier to further reduce the oxidation reaction of the coating layer 3 during heat treatment. As a result, it makes it easier to further improve the oxidation resistance of the coated tool 1 including the coating layer 3.
  • the types of elements contained in coating layer 3 and the content of those elements in coating layer 3 can be determined, for example, by using an energy dispersive X-ray spectrometer (EDS) attached to a scanning transmission electron microscope (STEM).
  • EDS energy dispersive X-ray spectrometer
  • STEM scanning transmission electron microscope
  • an electron beam is irradiated onto the surface of coating layer 3 from the scanning transmission electron microscope (STEM) to obtain an image of the surface of coating layer 3.
  • fluorescent X-rays generated by irradiating a predetermined area on the surface of coating layer 3 with the electron beam are detected using the energy dispersive X-ray spectrometer (EDS).
  • the wavelength and intensity of the characteristic X-rays contained in the detected fluorescent X-rays can be determined to determine the types of elements contained in the predetermined area on the surface of coating layer 3 and the content of those elements in the predetermined area on the surface of coating layer 3.
  • the coated tool 1 is manufactured by forming at least one coating layer 3 on the base body 2.
  • the coating layer 3 may be formed, for example, by physical vapor deposition (PVD).
  • PVD physical vapor deposition
  • the coating layer 3 can be easily formed to cover the entire surface of the base body 2 except for the inner surface of the through hole 15.
  • Examples of physical vapor deposition methods include ion plating methods such as arc ion plating (AIP) and sputtering.
  • Arc ion plating is a method in which a target element is evaporated using arc discharge in a vacuum atmosphere, and then combined with nitrogen (N 2 ) gas or the like as needed to form a film of the target element or a nitride of the target element.
  • the coated tool 1 when forming the coating layer 3 on the substrate 2 using the arc ion plating method, the coated tool 1 can be easily produced using the following method.
  • targets of Al, Ti, Nb, and M elements, or targets of composite elements, or sintered targets are prepared.
  • M is at least one element selected from the elements of Groups 4, 5, and 6 of the periodic table excluding Ti and Nb, and Si.
  • the target which is the source of the element
  • the target is evaporated and ionized by arc discharge, glow discharge, or the like.
  • the ionized element is reacted with, for example, nitrogen (N 2 ) gas and deposited on the surface of the substrate 2. This makes it possible to form a coating layer 3 on the substrate 2.
  • the coating layer 3 in order for the coating layer 3 to contain the needle-like crystals 5 after heat treatment at a temperature of 1050°C or higher and 1100°C or lower in the air atmosphere and for at least a portion of the needle-like crystals 5 to be located on the surface of the coating layer 3, it is possible to increase the plasma density and plasma energy of the ionized elements and gradually increase the bias voltage applied to the substrate 2.
  • Methods for increasing the plasma density and plasma energy of the ionized elements include, for example:
  • the temperature of the substrate 2 is set to a temperature in the range of 500°C to 600°C.
  • the pressure of the gas such as nitrogen gas must be in the range of 2 Pa to 8 Pa.
  • the distance between the target and the substrate 2 (TS distance) is set to a range of 50 mm to 200 mm. - Forming a linear magnetic field in the direction of the target; The distance between the cathodes is set to a range of 100 mm to 200 mm. - The magnetic flux density of the magnet must be in the range of 20mT to 80mT. The current of the arc discharge or the like may be set in the range of 130 A to 160 A. The bias voltage applied to the substrate 2 may be gradually increased within the range of ⁇ 30 V to ⁇ 75 V.
  • Fig. 4 is a front view showing an example of a cutting tool according to this embodiment.
  • the cutting tool 100 includes a coated tool 1 and a holder 70 for fixing the coated tool 1.
  • the holder 70 is a rod-shaped member extending from a first end (the upper end in FIG. 4) to a second end (the lower end in FIG. 4).
  • the holder 70 is made of, for example, steel or cast iron. Of these materials, steel, which has high toughness, may also be used.
  • a cutting tool 100 used for so-called turning is exemplified.
  • turning include internal diameter machining, external diameter machining, and grooving.
  • Cutting tools are not limited to those used for turning.
  • the coated tool 1 may be used as a cutting tool used for milling.
  • cutting tools used for milling include milling cutters such as flat milling cutters, face milling cutters, side milling cutters, and groove milling cutters, and end mills such as single-blade end mills, multi-blade end mills, tapered-blade end mills, and ball end mills.
  • Turning is performed using a lathe. Turning includes the steps of rotating the workpiece, bringing a fixed cutting tool 100 into contact with the rotating workpiece to remove the surface of the rotating workpiece, and removing the cutting tool 100 from the workpiece. By machining the workpiece into a desired rotationally symmetric shape in this way, it becomes easier to produce rotationally symmetric machined products.
  • Turning is performed using a milling machine. Turning includes the steps of rotating the cutting tool 100, bringing the rotating cutting tool 100 into contact with the fixed workpiece to remove the fixed workpiece, and removing the cutting tool 100 from the workpiece. By machining the workpiece into a desired shape in this way, it becomes easier to produce machined products.
  • the shape of the upper and lower surfaces of the cutting tool 100 is a parallelogram.
  • the shape of the upper and lower surfaces of the cutting tool 100 may be a rhombus, a square, etc.
  • the shape of the upper and lower surfaces of the cutting tool 100 may be a triangle, a pentagon, a hexagon, etc.
  • the shape of the cutting tool 100 may be either a positive type or a negative type.
  • a positive type is a type in which the side surfaces are inclined with respect to a central axis passing through the center of the upper surface and the center of the lower surface of the cutting tool 100
  • a negative type is a type in which the side surfaces are parallel to the central axis.
  • Figures 5A, 5B, and 5C are schematic diagrams showing steps of the method for manufacturing a machined product according to this embodiment.
  • the workpiece 201 is rotated around the axis O1, and the cutting tool 100 is brought relatively close to the workpiece 201.
  • the cutting edge of the coated tool 1 is brought into contact with the workpiece 201 to cut the workpiece 201.
  • the cutting tool 100 is moved relatively away from the workpiece 201.
  • the cutting tool 100 is moved in each step to bring the cutting tool 100 into contact with the workpiece 201 or to move the cutting tool 100 away from the workpiece 201.
  • the method for manufacturing a machined product is, of course, not limited to this form.
  • step A the workpiece 201 may be brought closer to the cutting tool 100.
  • step C the workpiece 201 may be moved away from the cutting tool 100.
  • the workpiece 201 can be kept rotating and the step of bringing the cutting edge of the cutting tool 100 into contact with different locations on the workpiece 201 can be repeated.
  • the cutting tool When performing milling rather than turning, the cutting tool may be rotated around a rotation axis in step A. Furthermore, in step B, the workpiece 201 may be cut by bringing the cutting edge of the rotating coated tool 1 into contact with the workpiece 201. Furthermore, in step C, the cutting tool may be moved away from the workpiece 201. Milling may be performed using a milling machine.
  • the Al and Ti contents in the coating layers of Samples 1 to 7 and 9 were determined before heat treatment. It was confirmed that the Al content in the coating layers of Samples 1, 3, and 4 according to the examples and Samples 7 and 9 according to the comparative examples was greater than the Ti content before heat treatment. On the other hand, it was confirmed that the Al content in the coating layers of Samples 2, 5, and 6 according to the examples was equal to or less than the Ti content before heat treatment.
  • the ratio X of the Al content in the coating layer to the Ti content in the coating layer before heat treatment was calculated for Samples 1 to 7 and 9 according to the coated tools. The calculated values of X are shown in Table 2.
  • the coated tools including the coating layer were heated in an air atmosphere using an air atmosphere electric furnace (NHK-170, manufactured by Nitto Kagaku Co., Ltd.). Specifically, the coated tools were heated to 1050°C in an air atmosphere at a heating rate of 1 hour, held at 1050°C for 1 minute, and then furnace cooled. In this manner, the coating layer included in the coated tools was heat-treated.
  • an air atmosphere electric furnace (NHK-170, manufactured by Nitto Kagaku Co., Ltd.).
  • the coated tools were heated to 1050°C in an air atmosphere at a heating rate of 1 hour, held at 1050°C for 1 minute, and then furnace cooled. In this manner, the coating layer included in the coated tools was heat-treated.
  • Figure 6 shows an image of the surface of the coating layer of the coated tool of Sample No. 1 according to the example after heat treatment. As shown in Figure 6, it was confirmed that the coating layer of the coated tool of Sample No. 1 according to the example contains needle-shaped crystals after heat treatment, and at least some of the needle-shaped crystals are located on the surface of the coating layer.
  • Figure 7 shows an image of the surface of the coating layer of the coated tool of Sample No. 7, a comparative example, after heat treatment. As shown in Figure 7, it was confirmed that the content of needle-shaped crystals in the coating layer of the coated tool of Sample No. 7, a comparative example, was 1% or less even after heat treatment.
  • the image processing software "Mac-View” was used to obtain the length of the image of the needle-like crystals in the longitudinal direction and the width of the image of the needle-like crystals in the lateral direction included in the image of the surface of the coating layer after heat treatment.
  • the aspect ratio of the needle-like crystals was then calculated by dividing the length of the image of the needle-like crystals in the longitudinal direction by the width of the image of the needle-like crystals in the lateral direction.
  • the calculated aspect ratio values of the needle-like crystals are shown in Table 2. It was confirmed that the average aspect ratio of the needle-like crystals was 2 or more and 10 or less for all of the coated tools of Examples No. 1 to No. 6.
  • the average aspect ratio of the needle-like crystals was 3 or more and 10 or less for all of the coated tools of Examples No. 1 to No. 5.
  • the crystal aspect ratios were also calculated in the same manner for the coated tools of Examples No. 7 to No. 9.
  • the calculated crystal aspect ratio values are shown in the "Aspect ratio of needle-shaped crystals" column in Table 2.
  • the average crystal aspect ratio was less than 2.
  • the content of needle-like crystals 5 in the coating layer 3 of the coated tool 1 after heat treatment was checked, and all were within the range of 50 to 95%.
  • the content of needle-like crystals 5 in the coating layer 3 of the coated tool 1 after heat treatment was checked, and all were 10% or less.
  • the Al and Ti contents in the coating layers of coated tools Samples 1 to 7 and 9 were determined after heat treatment. It was confirmed that the Al content in the coating layers of all coated tools Samples 1 to 7 and 9 was greater than the Ti content in the coating layers after heat treatment.
  • the ratio Y of the Al content in the coating layer to the Ti content in the coating layer after heat treatment was calculated.
  • the calculated Y values are shown in Table 2. It was confirmed that for all of the coated tools of Samples 1 to 5 according to the example and the coated tool of Sample 9 according to the comparative example, the ratio Y of the Al content in the coating layer to the Ti content in the coating layer surface was 2 or greater after heat treatment. On the other hand, it was confirmed that for all of the coated tool of Sample 6 according to the example and the coated tool of Sample 7 according to the comparative example, the ratio Y of the Al content in the coating layer to the Ti content in the coating layer surface was less than 2 after heat treatment.
  • the Y/X value was calculated from the ratio X of the Al content in the coating layer to the Ti content in the coating layer before heat treatment, and the ratio Y of the Al content in the coating layer to the Ti content in the coating layer after heat treatment.
  • the calculated Y/X values are shown in Table 2. It was confirmed that the relationship Y/X > 2 was satisfied for all of the coated tools of Samples 1 to 5 according to the example. On the other hand, it was confirmed that the relationship Y/X > 2 was not satisfied for the coated tool of Sample 6 according to the example and the coated tools of Samples 7 and 9 according to the comparative examples.
  • Table 3 shows the results of the cutting test for each of the coated tools of Samples No. 1 to No. 9. More specifically, Table 3 shows the wear width (mm) of the leading flank of the coated tool when cutting at low or high speed under the above cutting conditions.
  • the wear width of the leading flank of the coated tools of Samples 1 to 6 according to the embodiment was smaller than the wear width of the leading flank of the coated tools of Samples 7 to 9 according to the comparative example, in both low-speed and high-speed cutting.
  • the performance of the coated tools is thought to have been improved because the coating layer contains acicular crystals after heat treatment, and at least some of the acicular crystals are located on the surface of the coating layer.
  • the average aspect ratio of the acicular crystals is thought to be between 2 and 10, both inclusive.
  • the wear width of the leading flank of the coated tools of Examples No. 1 to No. 5 was smaller than that of the coated tool of Example No. 6, both in low-speed and high-speed cutting. This confirms that the performance of the coated tools of Examples No. 1 to No. 5 was improved compared to that of Example No. 6. It is believed that the performance of the coated tools was further improved when the average aspect ratio of the needle-like crystals was 3 or more and 10 or less. It is believed that the performance of the coated tools was further improved when the coating layer contained Al and Ti and the ratio of the Al content at the surface of the coating layer to the Ti content at the surface of the coating layer was 2 or more after heat treatment.
  • the coating layer contains Al and Ti, and the ratio X of the Al content in the coating layer to the Ti content in the coating layer before heat treatment, and the ratio Y of the Al content in the coating layer to the Ti content in the coating layer after heat treatment, satisfy the relationship Y/X > 2, which is believed to further improve the performance of the coated tool.
  • the wear width of the leading flank of the coated tools of Examples No. 1 to No. 4 was smaller than the wear width of the leading flank of the coated tools of Examples No. 5 and No. 6, in both low-speed and high-speed cutting. This confirms that the performance of the coated tools of Examples No. 1 to No. 4 was improved compared to the coated tools of Examples No. 5 and No. 6. It is believed that the performance of the coated tools was further improved by the fact that the needle-like crystals contained Al, Nb, and O.
  • the wear width of the leading flank of the coated tools of Examples No. 1 and No. 2 was smaller than the wear width of the leading flank of the coated tools of Examples No. 3 to No. 6, in both low-speed and high-speed cutting. This confirms that the performance of the coated tools of Examples No. 1 and No. 2 was improved compared to the coated tools of Examples No. 3 to No. 6. It is believed that the performance of the coated tools was further improved by the coating layer containing at least one of W and Si.
  • the wear width of the leading flank of the coated tool of Example Sample No. 1 was smaller than the wear width of the leading flank of the coated tool of Example Samples No. 2 to No. 6, in both low-speed and high-speed cutting. This confirms that the performance of the coated tool of Example Sample No. 1 was improved compared to the coated tools of Example Samples No. 2 to No. 6. It is believed that the performance of the coated tool was further improved by the inclusion of W in the coating layer.
  • This technology can be configured as follows. (1) a substrate; at least one coating layer overlying the substrate; the coating layer contains at least one element selected from the group consisting of elements of groups 4, 5, and 6 of the periodic table, Al, and Si, and at least one element selected from the group consisting of C and N, the coating layer contains needle-like crystals after heat treatment at a temperature of 1050°C or higher and 1100°C or lower in an air atmosphere, At least a portion of the needle-shaped crystals are located on the surface of the coating layer. Coated tools. (2) The content of the needle-shaped crystals in the coating layer is 1% or less before the heat treatment. The coated tool according to (1) above.
  • the average aspect ratio of the needle-like crystals is 2 or more and 10 or less;
  • the coating layer contains Al.
  • the needle-shaped crystals contain Al and O.
  • the coating layer contains Nb.
  • the needle-shaped crystals contain Nb and O.
  • the coating layer contains at least one of W and Si.
  • the coating layer contains W,
  • the needle-shaped crystals contain W and O.
  • the coating layer contains Al and Ti; The Al content in the coating layer is greater than the Ti content in the coating layer.
  • the coating layer contains Al and Ti; a ratio of an Al content at the surface of the coating layer to a Ti content at the surface of the coating layer after the heat treatment is 2 or more;
  • the coating layer contains Al and Ti; a ratio X of the Al content in the coating layer to the Ti content in the coating layer before the heat treatment and a ratio Y of the Al content in the coating layer to the Ti content in the coating layer after the heat treatment satisfy a relationship of Y/X>2;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)

Abstract

Un outil revêtu selon la présente invention comprend un substrat et au moins une couche de revêtement qui est disposée sur le substrat. La couche de revêtement contient au moins un élément choisi parmi les éléments des groupes 4, 5 et 6 du tableau périodique, Al et Si et au moins un élément choisi parmi C et N. Après un traitement thermique à une température de 1050 °C–1100 °C sous une atmosphère d'air, la couche de revêtement comprend des cristaux aciculaires dont au moins une partie sont à la surface de la couche de revêtement.
PCT/JP2025/013024 2024-04-03 2025-03-28 Outil revêtu, outil de coupe et procédé de production d'objet coupé Pending WO2025211301A1 (fr)

Applications Claiming Priority (2)

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JP2024-060487 2024-04-03
JP2024060487 2024-04-03

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WO2025211301A1 true WO2025211301A1 (fr) 2025-10-09

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008183627A (ja) * 2007-01-26 2008-08-14 Kyocera Corp 表面被覆工具
WO2014129530A1 (fr) * 2013-02-22 2014-08-28 京セラ株式会社 Outil de coupe
JP2016036873A (ja) * 2014-08-07 2016-03-22 三菱マテリアル株式会社 耐摩耗性にすぐれた表面被覆切削工具
JP2018115377A (ja) * 2017-01-19 2018-07-26 三菱日立ツール株式会社 硬質皮膜、硬質皮膜被覆工具、及びそれらの製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008183627A (ja) * 2007-01-26 2008-08-14 Kyocera Corp 表面被覆工具
WO2014129530A1 (fr) * 2013-02-22 2014-08-28 京セラ株式会社 Outil de coupe
JP2016036873A (ja) * 2014-08-07 2016-03-22 三菱マテリアル株式会社 耐摩耗性にすぐれた表面被覆切削工具
JP2018115377A (ja) * 2017-01-19 2018-07-26 三菱日立ツール株式会社 硬質皮膜、硬質皮膜被覆工具、及びそれらの製造方法

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