WO2024005058A1 - Plaquette et outil de coupe - Google Patents

Plaquette et outil de coupe Download PDF

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Publication number
WO2024005058A1
WO2024005058A1 PCT/JP2023/023936 JP2023023936W WO2024005058A1 WO 2024005058 A1 WO2024005058 A1 WO 2024005058A1 JP 2023023936 W JP2023023936 W JP 2023023936W WO 2024005058 A1 WO2024005058 A1 WO 2024005058A1
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WO
WIPO (PCT)
Prior art keywords
sintered body
cbn
cubic boron
boron nitride
particles
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Application number
PCT/JP2023/023936
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English (en)
Japanese (ja)
Inventor
太志 磯部
亜寿紗 萩原
佑脩 永岡
真二 明日山
Original Assignee
京セラ株式会社
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Publication date
Application filed by 京セラ株式会社 filed Critical 京セラ株式会社
Publication of WO2024005058A1 publication Critical patent/WO2024005058A1/fr

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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
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/16—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on nitrides

Definitions

  • the present disclosure relates to inserts and cutting tools.
  • Cubic boron nitride (cBN) has a hardness second only to diamond and is excellent in chemical stability. Therefore, cBN sintered bodies are widely used as cutting tools for machining ferrous metals such as hardened steel, cast iron, or sintered alloys.
  • An insert according to one aspect of the present disclosure includes a cubic boron nitride sintered body that includes a plurality of cubic boron nitride particles and a binder phase that binds the plurality of cubic boron nitride particles.
  • the length of the grain boundary between the plurality of cubic boron nitride particles and the binder phase per unit area of the plurality of cubic boron nitride particles is 3.2 ⁇ m - It is 1 or more.
  • FIG. 1 is a perspective view showing an example of an insert according to an embodiment.
  • FIG. 2 is a side sectional view showing an example of the insert according to the embodiment.
  • FIG. 3 is a cross-sectional view showing an example of the coating film according to the embodiment.
  • FIG. 4 is a schematic enlarged view of section H shown in FIG. 3.
  • FIG. 5 is a cross-sectional view showing an example of a cBN sintered body constituting the base according to the embodiment.
  • FIG. 6 is a front view showing an example of the cutting tool according to the embodiment.
  • FIG. 7 is a diagram showing the results of image analysis on photographs of each cross section of the cBN sintered body according to the example and photographs of each cross section of the cBN sintered body according to the comparative example.
  • FIG. 1 is a perspective view showing an example of an insert according to an embodiment.
  • FIG. 2 is a side sectional view showing an example of the insert according to the embodiment.
  • FIG. 3 is a cross-sectional view
  • FIG. 8 shows the field of view No. in the cBN sintered body according to the example. 1 is a partially enlarged view of a cross-sectional photograph of No. 1.
  • FIG. FIG. 9 shows the field of view No. in the cBN sintered body according to the comparative example. 1 is a partially enlarged view of a cross-sectional photograph of No. 1.
  • Cubic boron nitride (cBN) has a hardness second only to diamond and is excellent in chemical stability. Therefore, cBN sintered bodies are widely used as cutting tools for machining ferrous metals such as hardened steel, cast iron, or sintered alloys.
  • FIG. 1 is a perspective view showing an example of an insert 1 according to an embodiment.
  • FIG. 2 is a side sectional view showing an example of the insert 1 according to the embodiment.
  • the insert 1 is an insert for a cutting tool, and has, for example, a hexahedral shape in which the upper surface and the lower surface (the surface intersecting the Z axis shown in FIG. 1) are parallelograms.
  • the insert 1 includes a main body 2 and a base 10 attached to the main body 2 via a bonding material 40 (see FIG. 2), which will be described later.
  • the main body portion 2 is made of cemented carbide, for example.
  • the cemented carbide contains W (tungsten), specifically, WC (tungsten carbide).
  • the cemented carbide may contain Ni (nickel) or Co (cobalt).
  • the main body portion 2 may be formed of cermet.
  • the cermet contains, for example, Ti (titanium), specifically TiC (titanium carbide) or TiN (titanium nitride).
  • the cermet may contain Ni or Co.
  • a seat surface 4 for attaching the base 10 is located at the end of the main body 2.
  • a through hole 5 that vertically passes through the main body 2 is located in the center of the main body 2 .
  • a screw 75 for attaching the insert 1 to a holder 70 (described later) is inserted into the through hole 5 (see FIG. 6).
  • the base 10 is attached to the seat surface 4 of the main body 2. Thereby, the base body 10 is integrated with the main body portion 2.
  • the base 10 has a first surface 6 (here, the top surface) and a second surface 7 (here, the side surface) connected to the first surface 6.
  • the first surface 6 functions as a "rake surface” that scoops up chips generated by cutting
  • the second surface 7 functions as a "relief surface.”
  • a cutting blade 8 is located on at least a portion of the ridge line where the first surface 6 and the second surface 7 intersect, and the insert 1 cuts the work material by applying the cutting blade 8 to the work material. do.
  • the base body 10 is a cubic boron nitride (cBN) sintered body (hereinafter referred to as "cBN sintered body").
  • cBN cubic boron nitride
  • cBN sintered body has a hardness second only to diamond and has excellent chemical stability. The specific structure of the cBN sintered body constituting the base body 10 will be described later.
  • a substrate 30 made of, for example, cemented carbide or cermet may be located on the lower surface of the base 10.
  • the base 10 is bonded to the seat surface 4 of the main body 2 via the substrate 30 and the bonding material 40.
  • the bonding material 40 is, for example, a brazing material.
  • the base 10 may be joined to the main body 2 via a bonding material 40 at a portion of the main body 2 other than the seat surface 4 .
  • the base body 10, which is a part of the insert 1 is made of a cBN sintered body, but the entire insert 1 may be made of a cBN sintered body.
  • the base body 10 may be covered with a coating film 20.
  • the coating film 20 covers the base body 10 for the purpose of improving the wear resistance, heat resistance, etc. of the base body 10, for example.
  • the coating film 20 covers the main body portion 2 and the base 10 entirely.
  • the present invention is not limited thereto, and the coating film 20 may be located on at least a portion of the surface of the base body 10 . In this case, the heat resistance and abrasion resistance of the base body 10 can be improved.
  • the coating film 20 may be located on the upper surface of the main body part 2.
  • the first surface 6 see FIG. 1 has high wear resistance and high heat resistance.
  • the second surface 7 has high wear resistance and heat resistance.
  • FIG. 3 is a cross-sectional view showing an example of the coating film 20 according to the embodiment.
  • the coating film 20 includes a hard layer 21.
  • the hard layer 21 is a layer with excellent wear resistance compared to the metal layer 22 described later.
  • Hard layer 21 includes one or more metal nitride layers.
  • the hard layer 21 may be one layer. As shown in FIG. 3, multiple metal nitride layers may be overlapped.
  • the hard layer 21 may include a laminated portion 23 in which a plurality of metal nitride layers are laminated, and a third metal nitride layer 24 located on the laminated portion 23. The structure of such hard layer 21 will be described later.
  • Metal layer 22 Covering film 20 includes metal layer 22 .
  • Metal layer 22 is located between base body 10 and hard layer 21 . Specifically, the metal layer 22 is in contact with the upper surface of the base 10 on one surface (here, the lower surface), and is in contact with the lower surface of the hard layer 21 on the other surface (here, the upper surface).
  • the metal layer 22 has higher adhesion to the base 10 than the hard layer 21.
  • metal elements having such characteristics include Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si, and Y.
  • the metal layer 22 contains at least one metal element among the above metal elements. In this way, when the metal layer 22 contains at least one element selected from the group consisting of Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si, and Y, The adhesion between the coating film 10 and the coating film 20 can be improved.
  • a simple substance of Ti, a simple substance of Zr, a simple substance of V, a simple substance of Cr, and a simple substance of Al are not used as the metal layer 22. This is because all of these have low melting points and low oxidation resistance, making them unsuitable for use in cutting tools. Hf alone, Nb alone, and Ta alone have low adhesion to the substrate 10. However, this does not apply to alloys containing Ti, Zr, V, Cr, Ta, Nb, Hf, or Al. Therefore, the metal layer 22 may be made of a metal other than Ti, Zr, V, Cr, Ta, Nb, Hf, and Al. In this case, the oxidation resistance of the metal layer 22 and the adhesion between the base 10 and the coating film 20 can be improved.
  • the metal layer 22 may be an Al-Cr alloy layer containing an Al-Cr alloy. Since the metal layer 22 has particularly high adhesion to the base 10, it is highly effective in improving the adhesion between the base 10 and the coating film 20.
  • the content of Al in the metal layer 22 may be greater than the content of Cr in the metal layer 22.
  • the composition ratio (atomic %) of Al and Cr in the metal layer 22 may be 70:30. With such a composition ratio, the adhesion between the base body 10 and the metal layer 22 is higher.
  • the metal layer 22 may contain components other than the above metal elements (Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si, and Y). However, from the viewpoint of adhesion to the base 10, the metal layer 22 may contain at least 95 atomic % or more of the above metal elements in total. The metal layer 22 may contain the above metal elements in a total amount of 98 atomic % or more. For example, when the metal layer 22 is an Al--Cr alloy layer, the metal layer 22 may contain at least 95 atomic % or more of Al and Cr in total. The metal layer 22 may contain at least 98 atomic % or more of Al and Cr in total. The proportion of metal components in the metal layer 22 can be determined, for example, by analysis using an EDS (energy dispersive X-ray spectrometer).
  • EDS energy dispersive X-ray spectrometer
  • the metal layer 22 may contain as little Ti as possible from the viewpoint of improving adhesion with the substrate 10. Specifically, the content of Ti in the metal layer 22 may be 15 atomic % or less.
  • the base 10 and the coating film can be bonded to each other. 20 can be improved. Since the metal layer 22 has high adhesion to the hard layer 21, peeling of the hard layer 21 from the metal layer 22 is unlikely to occur.
  • cBN used as the substrate 10 is an insulator
  • cBN which is an insulator
  • PVD physical vapor deposition
  • FIG. 4 is a schematic enlarged view of section H shown in FIG. 3.
  • the hard layer 21 has a laminated part 23 located on the metal layer 22 and a third metal nitride layer 24 located on the laminated part 23.
  • the laminated portion 23 includes a plurality of first metal nitride layers 23a and a plurality of second metal nitride layers 23b.
  • the laminated portion 23 has a structure in which first metal nitride layers 23a and second metal nitride layers 23b are alternately laminated.
  • the thickness of the first metal nitride layer 23a and the second metal nitride layer 23b may each be 50 nm or less.
  • the first metal nitride layer 23a is a layer in contact with the metal layer 22, and the second metal nitride layer 23b is formed on the first metal nitride layer 23a.
  • the first metal nitride layer 23a and the second metal nitride layer 23b may contain the metal contained in the metal layer 22.
  • the metal layer 22 contains two types of metals (herein referred to as "first metal” and "second metal”).
  • first metal nitride layer 23a contains nitrides of the first metal and the third metal.
  • the third metal is a metal that is not included in the metal layer 22.
  • second metal nitride layer 23b contains nitrides of the first metal and the second metal.
  • the metal layer 22 may contain Al and Cr.
  • the first metal nitride layer 23a may contain Al.
  • the first metal nitride layer 23a may be an AlTiN layer containing AlTiN, which is a nitride of Al and Ti.
  • the second metal nitride layer 23b may be an AlCrN layer containing AlCrN, which is a nitride of Al and Cr.
  • the adhesion between the metal layer 22 and the hard layer 21 is high. This makes it difficult for the hard layer 21 to peel off from the metal layer 22, so the durability of the coating film 20 is high.
  • the first metal nitride layer 23a that is, the AlTiN layer
  • the second metal nitride layer 23b ie, the AlCrN layer
  • the coating film 20 controls the characteristics such as wear resistance and heat resistance of the hard layer 21 by including the first metal nitride layer 23a and the second metal nitride layer 23b having mutually different compositions. be able to. Thereby, the tool life of the insert 1 can be extended.
  • mechanical properties such as adhesion with the metal layer 22 and abrasion resistance can be improved while maintaining the excellent heat resistance of AlCrN.
  • the laminated portion 23 may be formed by, for example, an arc ion plating method (AIP method).
  • AIP method uses arc discharge in a vacuum atmosphere to evaporate target metals (here, AlTi target and AlCr target), and forms metal nitrides (here, AlTiN and AlCrN) by combining with N2 gas. This is a method of coating.
  • the metal layer 22 may also be formed by the AIP method.
  • the third metal nitride layer 24 may be located on the laminated portion 23. Specifically, the third metal nitride layer 24 is in contact with the second metal nitride layer 23b of the laminated portion 23.
  • the third metal nitride layer 24 is, for example, a metal nitride layer (AlTiN layer) containing Ti and Al, like the first metal nitride layer 23a.
  • the thickness of the third metal nitride layer 24 may be thicker than each of the first metal nitride layer 23a and the second metal nitride layer 23b. Specifically, when the first metal nitride layer 23a and the second metal nitride layer 23b have a thickness of 50 nm or less as described above, the third metal nitride layer 24 may have a thickness of 1 ⁇ m or more. For example, the thickness of the third metal nitride layer 24 may be 1.2 ⁇ m.
  • the welding resistance of the insert 1 can be improved.
  • the wear resistance of the insert 1 can be improved.
  • the oxidation start temperature of the third metal nitride layer 24 is high, the oxidation resistance of the insert 1 can be improved.
  • the thickness of the third metal nitride layer 24 may be thicker than the thickness of the laminated portion 23. Specifically, in the embodiment, when the thickness of the laminated portion 23 is 0.5 ⁇ m or less, the thickness of the third metal nitride layer 24 may be 1 ⁇ m or more. For example, when the thickness of the laminated portion 23 is 0.3 ⁇ m, the thickness of the third metal nitride layer 24 may be 1.2 ⁇ m.
  • the thickness of the metal layer 22 may be, for example, 0.1 ⁇ m or more and less than 0.6 ⁇ m. That is, the metal layer 22 may be thicker than each of the first metal nitride layer 23a and the second metal nitride layer 23b, and thinner than the laminated portion 23.
  • FIG. 5 is a cross-sectional view showing an example of the cBN sintered body 11 that constitutes the base body 10 according to the embodiment.
  • the cBN sintered body 11 constituting the base 10 includes a plurality of cubic boron nitride (cBN) particles (hereinafter referred to as "cBN particles") 12 and a binder phase 13. including.
  • the cBN particles 12 are particles made of cubic boron nitride (cBN).
  • the binder phase 13 refers to a portion of the cBN sintered body 11 other than the plurality of cBN particles 12.
  • the bonded phase 13 is located between the plurality of cBN particles 12.
  • the bonded phase 13 binds the plurality of cBN particles 12. That is, in the cBN sintered body 11, a plurality of cBN particles 12 are bonded together via the binder phase 13.
  • the binder phase 13 is, for example, a carbide containing Ti (TiC), a nitride containing Ti (TiN), a carbonitride containing Ti (TiCN), a boride containing Ti, Al, AlN, and Al. Contains at least one compound selected from the group consisting of 2O3 .
  • boride containing Ti include titanium diboride (TiB 2 ).
  • Such a binder phase 13 can more firmly bind the plurality of cBN particles 12. Thereby, it is possible to reduce shedding of the cBN particles 12 from the binder phase 13 and/or the occurrence of cracks in the cBN sintered body 11. Thereby, the wear resistance and chipping resistance of the insert 1 including the base body 10 made of the cBN sintered body 11 can be improved.
  • the length of the grain boundary between the plurality of cBN particles 12 and the binder phase 13 per unit area of the plurality of cBN particles 12 is 3.2 ⁇ m ⁇ 1 That's all.
  • the cross section of the cBN sintered body 11 according to the embodiment is not particularly limited, and is any cross section of the cBN sintered body 11.
  • a photograph of the cross section of the cBN sintered body 11 can be taken using a scanning electron microscope (SEM) or a transmission electron microscope (TEM).
  • image processing software such as Image J can be used, for example.
  • the area of the cross section of the cBN sintered body 11 (cross-sectional area of the cBN sintered body 11) ( ⁇ m 2 ) and the cBN
  • the content rate (area %) of a plurality of cBN particles 12 in the quality sintered body 11 is obtained.
  • the content rate of the cBN particles 12 in the cBN sintered body 11 is determined by the sum of the area of the cBN particles 12 included in the cross section of the cBN sintered body 11 relative to the area of the cross section of the cBN sintered body 11. The ratio is x100.
  • the length of the grain boundary between the plurality of cBN particles 12 and the binder phase 13 in the cross section of the cBN sintered body 11 can be determined. Obtain the sum ( ⁇ m).
  • the plural cBN particles 12 and the binder phase 13 can be increased. That is, the dispersibility of the plurality of cBN particles 12 in the binder phase 13 can be improved. Thereby, the bonding between the plurality of cBN particles 12 and the binder phase 13 can be improved. That is, the plurality of cBN particles 12 can be more firmly bound (sintered) by the binder phase 13.
  • bonding between the plurality of cBN particles 12 can be reduced.
  • the wear resistance and chipping resistance of the insert 1 including the base body 10 made of the cBN sintered body 11 can be improved.
  • the length of the grain boundary between the plurality of cBN particles 12 and the binder phase 13 per unit area of the cBN sintered body 11 is 2.2 ⁇ m ⁇ It may be 1 or more.
  • the cross sectional area ( ⁇ m 2 ) of the cBN sintered body 11 and the plurality of cBN particles 12 within the cross section of the cBN sintered body 11 are determined.
  • the total length ( ⁇ m) of grain boundaries between and the binder phase 13 is obtained.
  • the cBN sintered body 11 is determined.
  • the length ( ⁇ m ⁇ 1 ) of the grain boundary between the plurality of cBN particles 12 and the binder phase 13 per unit area is obtained.
  • the plurality of cBN particles 12 and The contact area with phase 13 can be increased. That is, the dispersibility of the plurality of cBN particles 12 in the binder phase 13 can be improved. Thereby, the bonding between the plurality of cBN particles 12 and the binder phase 13 can be improved. That is, the plurality of cBN particles 12 can be more firmly bound (sintered) by the binder phase 13.
  • bonding between the plurality of cBN particles 12 can be reduced.
  • the wear resistance and chipping resistance of the insert 1 including the base body 10 made of the cBN sintered body 11 can be improved.
  • the content of the plurality of cBN particles 12 in the cBN sintered body 11 may be at least 60 area % or more.
  • the content of the plurality of cBN particles 12 in the cBN sintered body 11 may be 65 area % or more.
  • the content rate of the plurality of cBN particles 12 in the cBN sintered body 11 may be 55 area % or more and 85 area % or less.
  • the content of the plurality of cBN particles 12 in the cBN sintered body 11 is 55 area% or more, the fracture resistance of the insert 1 including the base body 10 constituted by the cBN sintered body 11 is improved. can be done.
  • the content of the plurality of cBN particles 12 in the cBN sintered body 11 is 85 area% or less, the wear resistance of the insert 1 including the base body 10 constituted by the cBN sintered body 11 is improved. can be done.
  • each raw material powder in an organic solvent is ground and mixed in a ball mill for 20 to 24 hours. After pulverizing and mixing each raw material powder, the organic solvent is evaporated to obtain a first mixed powder.
  • IPA isopropyl alcohol
  • cBN powder having an average particle size of 2.0 to 4.5 ⁇ m is added to the obtained first mixed powder.
  • the volume ratio of the first mixed powder and the cBN powder is 22-32%:68-78%.
  • An organic solvent is added to the first mixed powder and cBN powder.
  • the organic solvent acetone or alcohols such as IPA can be used.
  • the first mixed powder in the organic solvent and the cBN powder are ground and mixed in a ball mill for 20 to 24 hours. After pulverizing and mixing the first mixed powder and cBN powder, the organic solvent is evaporated to obtain a second mixed powder.
  • the obtained second mixed powder is heat-treated in a vacuum atmosphere at 650 to 1000° C. for 1 to 4 hours in a vacuum furnace to obtain a third mixed powder.
  • an organic solvent is added to the obtained third mixed powder.
  • the organic solvent acetone or alcohols such as IPA can be used.
  • the third mixed powder in the organic solvent is ground and mixed in a ball mill for 20 to 24 hours.
  • an organic binder is added to the third mixed powder in the organic solvent.
  • the organic binder paraffin, acrylic resin, or the like can be used.
  • a fourth mixed powder is obtained by evaporating the organic solvent.
  • a dispersant may be added as necessary.
  • a molded body is obtained by molding this fourth mixed powder into a predetermined shape.
  • known methods such as uniaxial press or cold isostatic press (CIP) can be used.
  • This molded body is heated at a predetermined temperature within the range of 500 to 1000°C to evaporate and remove the organic binder, thereby obtaining a molded body for firing.
  • the molded body for firing is placed in an ultra-high pressure heating device and heated at a temperature of 1200 to 1500° C. for 15 to 30 minutes under a pressure of 4 to 6 GPa.
  • a cBN sintered body 11 according to the embodiment is obtained.
  • the length of the grain boundary between the plurality of cBN particles 12 and the binder phase 13 per unit area of the plurality of cBN particles 12 is 3.2 ⁇ m - 1 or more, the cBN-based sintered body 11 can be obtained. Further, in the cross section of the cBN sintered body 11, the length of the grain boundary between the plurality of cBN particles 12 and the binder phase 13 per unit area of the cBN sintered body 11 is 2.2 ⁇ m ⁇ 1 or more. Thus, a cBN sintered body 11 can be obtained.
  • the cBN sintered body 11 is arranged so that the content of the plurality of cBN particles 12 in the cBN sintered body 11 is 55 area % or more and 85 area % or less in the cross section of the cBN sintered body 11. can be obtained.
  • An insert 1 including a base body 10 can be obtained using the obtained cBN sintered body 11.
  • FIG. 6 is a front view showing an example of the cutting tool 100 according to the embodiment.
  • the cutting tool 100 includes an insert 1 and a holder 70 for fixing the insert 1.
  • the holder 70 is a rod-shaped member that extends from a first end (upper end in FIG. 6) to a second end (lower end in FIG. 6).
  • the holder 70 is made of steel or cast iron, for example. In particular, among these materials, steel with high toughness is sometimes used.
  • the holder 70 has a pocket 73 at the first end.
  • the pocket 73 is a portion to which the insert 1 is attached, and has a seating surface that intersects with the rotational direction of the workpiece, and a restraining side surface that is inclined with respect to the seating surface.
  • the seating surface is provided with a screw hole into which a screw 75 (described later) is screwed.
  • the insert 1 is located in the pocket 73 of the holder 70 and is attached to the holder 70 by a screw 75. That is, a screw 75 is inserted into the through hole 5 of the insert 1, and the tip of the screw 75 is inserted into a screw hole formed in the seating surface of the pocket 73, so that the screw portions are screwed together. Thereby, the insert 1 is attached to the holder 70 so that the cutting edge portion 3 protrudes outward from the holder 70.
  • a cutting tool used for so-called turning is exemplified.
  • turning processing include inner diameter processing, outer diameter processing, and grooving.
  • the cutting tool is not limited to those used for turning.
  • the insert 1 may be used in a cutting tool used for milling.
  • Cutting tools used for milling include, for example, milling cutters such as flat milling cutters, face milling cutters, side milling cutters, and groove milling cutters, and end mills such as single-flute end mills, multi-flute end mills, tapered-flute end mills, and ball end mills. Examples include.
  • cutting of a workpiece includes (1) a process of rotating the workpiece, (2) a process of bringing the cutting blade 3 of the insert 1 into contact with the rotating workpiece to cut the workpiece, and , (3) including the step of separating the insert 1 from the workpiece.
  • typical examples of the material of the workpiece include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.
  • Example 1 A cBN sintered body according to an example was produced as described below.
  • acetone and a dispersant were added to 77% by volume TiN raw powder, 18% by volume Al raw material powder, and 5 % by volume Al2O3 raw material powder, and then each raw material was mixed in acetone for 24 hours in a ball mill. The powder was ground and mixed. After pulverizing and mixing each raw material powder, acetone was evaporated to obtain a first mixed powder.
  • cBN powder with an average particle size of 3 ⁇ m was added to the obtained first mixed powder.
  • the volume ratio of the first mixed powder and cBN powder was 27:73.
  • the first mixed powder and cBN powder were ground and mixed in acetone for 24 hours in a ball mill.
  • acetone was evaporated to obtain a second mixed powder.
  • the obtained second mixed powder was heat treated in a vacuum atmosphere at a temperature of 800° C. for 2 hours in a vacuum furnace to obtain a third mixed powder.
  • acetone and a dispersant were added to the obtained third mixed powder, and then the third mixed powder in acetone was ground and mixed in a ball mill for 24 hours. After pulverizing and mixing the obtained third mixed powder, an organic binder was further added to the third mixed powder in acetone. Thereafter, the acetone was evaporated to obtain a fourth mixed powder.
  • a molded body was obtained by molding the obtained fourth mixed powder using a uniaxial pressure press.
  • the organic binder was evaporated and removed by heating the obtained molded body at a temperature of 800° C., and a molded body for firing was obtained.
  • the obtained compact for firing was placed in an ultra-high pressure heating device and heated at a temperature of 1350° C. for 20 minutes under a pressure of 5 GPa.
  • a cBN sintered body according to the example was obtained.
  • acetone and a dispersant were added to 77% by volume TiN raw powder, 18% by volume Al raw material powder, and 5 % by volume Al2O3 raw material powder, and then each raw material was mixed in acetone for 24 hours in a ball mill. The powder was ground and mixed. After pulverizing and mixing each raw material powder, acetone was evaporated to obtain a fifth mixed powder.
  • cBN powder having an average particle size of 3 ⁇ m was added to the obtained fifth mixed powder.
  • the volume ratio of the fifth mixed powder and cBN powder was 27:73.
  • the fifth mixed powder and cBN powder were ground and mixed in acetone for 24 hours in a ball mill.
  • an organic binder was further added to the fifth mixed powder and cBN powder in acetone. Thereafter, the acetone was evaporated to obtain a sixth mixed powder.
  • a molded body was obtained by molding the obtained sixth mixed powder using a uniaxial pressure press.
  • the organic binder was evaporated and removed by heating the obtained molded body at a temperature of 800° C., and a molded body for firing was obtained.
  • the obtained compact for firing was placed in an ultra-high pressure heating device and heated at a temperature of 1350° C. for 20 minutes under a pressure of 5 GPa.
  • a cBN sintered body according to a comparative example was obtained.
  • the total area ( ⁇ m 2 ) of cBN particles in the cross section of the cBN sintered body was calculated from the cross-sectional area of the cBN sintered body and the content of cBN particles in the cBN sintered body. From the total length of the grain boundaries between the cBN particles and the binder phase and the total area of the cBN particles, the length of the grain boundaries between the cBN particles and the binder phase per unit area of the cBN particles ( ⁇ m -1 ) was calculated. From the total length of the grain boundaries between the cBN particles and the binder phase and the cross-sectional area of the cBN sintered body 11, the length of the grain boundaries between the cBN particles and the binder phase per unit area of the cBN sintered body is calculated. The length ( ⁇ m ⁇ 1 ) was obtained.
  • FIG. 7 is a diagram showing the results of image analysis for photographs of each cross section of the cBN sintered body according to the example and the photographs of each cross section of the cBN sintered body according to the comparative example.
  • the relationship between the cBN particles and the binder phase per unit area of the cBN particles in the cross section of the cBN sintered body according to the example is The grain boundary length was 3.2 ⁇ m ⁇ 1 or more.
  • the length of the grain boundary between the cBN particles and the binder phase per unit area of the cBN sintered body in the cross section of the cBN sintered body according to the example was 2.2 ⁇ m ⁇ 1 or more.
  • the content of cBN particles in the cBN sintered body in the cross section of the cBN sintered body according to the example is 55 area % or more and 85 area % or less. there were.
  • the ratio of cBN particles and binder phase per unit area of cBN particles in the cross section of the cBN sintered body according to the comparative example is The length of the grain boundaries between the grains was less than 3.2 ⁇ m ⁇ 1 .
  • the length of the grain boundary between the cBN particles and the binder phase per unit area of the cBN sintered body in the cross section of the cBN sintered body according to the comparative example was less than 2.2 ⁇ m ⁇ 1 .
  • FIG. 8 shows the field of view No. in the cBN sintered body according to the example. 1 is a partially enlarged view of a cross-sectional photograph of No. 1.
  • FIG. 9 shows the field of view No. in the cBN sintered body according to the comparative example. 1 is a partially enlarged view of a cross-sectional photograph of No. 1.
  • FIG. 8 shows the field of view No. in the cBN sintered body according to the example. 1 is a partially enlarged view of a cross-sectional photograph of No. 1.
  • FIG. 9 shows the field of view No. in the cBN sintered body according to the comparative example. 1 is a partially enlarged view of a cross-sectional photograph of No. 1.
  • the contact area between the cBN particles and the binder phase in the cBN sintered body according to the example is the same as the contact area between the cBN particles and the binder phase in the cBN sintered body according to the comparative example. It was confirmed that the contact area between the In other words, the frequency of bonding between cBN particles in the cBN sintered body according to the example is lower than the frequency of bonding between cBN particles in the cBN sintered body according to the comparative example. I was able to confirm.
  • the dispersibility of cBN particles in the binder phase in the cBN sintered body according to the example is higher than the dispersibility of cBN particles in the binder phase in the cBN sintered body according to the comparative example. I was able to do that.
  • an insert according to an embodiment includes a plurality of cubic boron nitride particles (for example, a plurality of cBN particles 12) and a bonding phase that binds the plurality of cubic boron nitride particles.
  • a cubic boron nitride sintered body for example, a cBN sintered body 11
  • a binder phase 13 for example, a binder phase 13
  • the length of the grain boundary between the plurality of cubic boron nitride particles and the binder phase per unit area of the plurality of cubic boron nitride particles is 3.2 ⁇ m - It is 1 or more.
  • the length of the grain boundary between the binder phase and the plurality of cubic boron nitride particles per unit area of the cubic boron nitride sintered body is 2.2 ⁇ m. -1 or more.
  • the content of the plurality of cubic boron nitride particles in the cubic boron nitride sintered body is 55 area % or more and 85 area % or less.
  • the dispersibility of the plurality of cBN particles in the binder phase can be improved, and therefore the bonding between the plurality of cBN particles and the binder phase can be improved. Therefore, the wear resistance and chipping resistance of the insert including the base body made of the cBN sintered body can be improved.
  • the insert 1 according to the embodiment may further include a coating film (for example, the coating film 20) located on the cBN sintered body 11.
  • a coating film for example, the coating film 20 located on the cBN sintered body 11.
  • the shape of the top surface and the bottom surface of the cutting tool 100 is a parallelogram, but the shape of the top surface and the bottom surface of the cutting tool 100 may be a rhombus, a square, or the like.
  • the shape of the upper surface and lower surface of the cutting tool 100 may be triangular, pentagonal, hexagonal, or the like.
  • the shape of the cutting tool 100 may be a positive type or a negative type.
  • the positive type is a type in which the side surface is inclined with respect to a central axis passing through the center of the upper surface and the center of the lower surface of the cutting tool 100
  • the negative type is a type in which the side surface is parallel to the central axis.
  • a cross-section of the cubic boron nitride sintered body comprising a plurality of cubic boron nitride particles and a binder phase that binds the plurality of cubic boron nitride particles.
  • the length of the grain boundary between the plurality of cubic boron nitride particles and the binder phase per unit area of the plurality of cubic boron nitride particles is 3.2 ⁇ m ⁇ 1 or more.
  • the binder phase is a group consisting of a carbide containing Ti, a nitride containing Ti, a carbonitride containing Ti, a boride containing Ti, Al, AlN, and Al 2 O 3
  • the coating film includes a hard phase and a metal layer located between the cubic boron nitride sintered body and the hard phase, and the metal layer includes Ti, Zr, V , Cr, Ta, Nb, Hf, and Al, the insert according to supplementary note (5).
  • the metal layer contains at least one element selected from the group consisting of Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si, and Y. ).
  • a cutting tool comprising a rod-shaped holder having a pocket at an end, and an insert according to any one of Supplementary Notes (1) to (7) located within the pocket.

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

Abstract

La présente invention concerne une plaquette comportant un comprimé fritté de nitrure de bore cubique comprenant une pluralité de particules de nitrure de bore cubique et un phase liante qui lie la pluralité de particules de nitrure de bore cubique. Dans la coupe du comprimé fritté de nitrure de bore cubique, la longueur de limites de grains entre la phase liante et la pluralité de particules de nitrure de bore cubique par unité d'aire de la pluralité de particules de nitrure de bore cubique est de 3,2 μm-1 ou plus.
PCT/JP2023/023936 2022-06-28 2023-06-28 Plaquette et outil de coupe WO2024005058A1 (fr)

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JP2022-103940 2022-06-28

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11335175A (ja) * 1998-05-22 1999-12-07 Sumitomo Electric Ind Ltd 立方晶窒化ホウ素焼結体
JP2004042192A (ja) * 2002-07-11 2004-02-12 Sumitomo Electric Ind Ltd 被覆切削工具
JP2010284759A (ja) * 2009-06-12 2010-12-24 Mitsubishi Materials Corp 表面被覆切削工具
JP2015193046A (ja) * 2014-03-31 2015-11-05 三菱マテリアル株式会社 切削工具
JP2018052781A (ja) * 2016-09-30 2018-04-05 三菱マテリアル株式会社 立方晶窒化ほう素基焼結体および立方晶窒化ほう素基焼結体製切削工具
WO2019244894A1 (fr) * 2018-06-18 2019-12-26 住友電工ハードメタル株式会社 Nitrure de bore cubique polycristallin et son procédé de production
WO2021192509A1 (fr) * 2020-03-24 2021-09-30 昭和電工株式会社 Corps fritté en nitrure de bore cubique, procédé de production associé, et outil

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11335175A (ja) * 1998-05-22 1999-12-07 Sumitomo Electric Ind Ltd 立方晶窒化ホウ素焼結体
JP2004042192A (ja) * 2002-07-11 2004-02-12 Sumitomo Electric Ind Ltd 被覆切削工具
JP2010284759A (ja) * 2009-06-12 2010-12-24 Mitsubishi Materials Corp 表面被覆切削工具
JP2015193046A (ja) * 2014-03-31 2015-11-05 三菱マテリアル株式会社 切削工具
JP2018052781A (ja) * 2016-09-30 2018-04-05 三菱マテリアル株式会社 立方晶窒化ほう素基焼結体および立方晶窒化ほう素基焼結体製切削工具
WO2019244894A1 (fr) * 2018-06-18 2019-12-26 住友電工ハードメタル株式会社 Nitrure de bore cubique polycristallin et son procédé de production
WO2021192509A1 (fr) * 2020-03-24 2021-09-30 昭和電工株式会社 Corps fritté en nitrure de bore cubique, procédé de production associé, et outil

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