WO2024034076A1 - Grain superabrasif et meule - Google Patents

Grain superabrasif et meule Download PDF

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Publication number
WO2024034076A1
WO2024034076A1 PCT/JP2022/030622 JP2022030622W WO2024034076A1 WO 2024034076 A1 WO2024034076 A1 WO 2024034076A1 JP 2022030622 W JP2022030622 W JP 2022030622W WO 2024034076 A1 WO2024034076 A1 WO 2024034076A1
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Prior art keywords
superabrasive
abrasive grain
less
mass
grindstone
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PCT/JP2022/030622
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English (en)
Japanese (ja)
Inventor
修一 網野
健 山村
真人 道内
克己 岡村
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住友電気工業株式会社
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Priority to PCT/JP2022/030622 priority Critical patent/WO2024034076A1/fr
Publication of WO2024034076A1 publication Critical patent/WO2024034076A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/14—Anti-slip materials; Abrasives

Definitions

  • the present disclosure relates to superabrasives and grindstones.
  • a grindstone containing abrasive grains and a binder is used as a tool for precision machining.
  • BACKGROUND ART Conventionally, a grindstone in which abrasive grains made of diamond, cubic boron nitride, alumina, silicon carbide, etc. are bonded together by a vitrified bond has been used (Patent Document 1).
  • the superabrasive grain according to one aspect of the present disclosure is A superabrasive grain comprising an abrasive grain body and an oxidation prevention film covering at least a part of the surface of the abrasive grain body,
  • the abrasive grain main body is made of cubic boron nitride or diamond,
  • the average grain size of the abrasive grain body is less than 1.0 ⁇ m.
  • a grindstone according to one aspect of the present disclosure a ring-shaped base metal, a superabrasive layer disposed on the surface of the base metal,
  • the superabrasive layer includes the superabrasive and a binder,
  • the softening point of the binder is 400°C or more and 1000°C or less.
  • FIG. 1 is a schematic cross-sectional view illustrating one embodiment of the superabrasive grain of the present disclosure.
  • FIG. 2 is a schematic cross-sectional view illustrating another embodiment of the superabrasive grain of the present disclosure.
  • FIG. 3 is a schematic plan view illustrating one embodiment of the grindstone of the present disclosure.
  • FIG. 4 is a cross-sectional view taken along the line IV--IV in FIG.
  • FIG. 5 is a schematic diagram showing a method of grinding a work material using a grindstone.
  • the manufacturing process of a grindstone that includes diamond or cubic boron nitride (cBN)-based abrasive grains and a binder includes a firing process in the atmosphere. Due to the firing process, the abrasive grains tend to be easily deteriorated by heat. In the case of abrasive grains made of diamond, the hardness of the diamond decreases due to a combustion reaction between the diamond and oxygen in the atmosphere. Further, due to the combustion reaction, the abrasive grains made of diamond themselves disappear, and the bonding strength at the interface between the abrasive grains and the binder decreases.
  • cBN cubic boron nitride
  • abrasive grains made of cBN the hardness of cBN decreases due to the reaction between cBN on the surface of the abrasive grains and oxygen to produce boron oxide. Therefore, the tool performance (sharpness) of a grindstone containing such abrasive grains may not be sufficient.
  • Thermal deterioration of abrasive grains as described above tends to occur particularly in ultrafine abrasive grains with a grain size of less than 1.0 ⁇ m, which are used under the processing conditions required to reduce the surface roughness of the machined surface.
  • an object of the present disclosure is to provide a superabrasive grain that can provide a whetstone with excellent grinding performance, and a whetstone that includes the superabrasive grain.
  • the abrasive grains according to one aspect of the present disclosure are: A superabrasive grain comprising an abrasive grain body portion and an oxidation prevention film covering at least a part of the surface of the abrasive grain body portion,
  • the abrasive grain main body is made of cubic boron nitride or diamond,
  • the average grain size of the abrasive grain main body portion is less than 1.0 ⁇ m.
  • a grindstone containing superabrasive grains according to one embodiment of the present disclosure can have excellent grinding performance.
  • thermogravimetric analysis is 70% or more,
  • the thermogravimetric analysis is preferably performed at a temperature of 900° C. and a holding time of 0.5 hours. This makes it possible to provide a grindstone with better grinding performance.
  • the antioxidant film is made of a first material,
  • the first material is made of ceramics or glass. This makes it possible to provide a grindstone with better grinding performance.
  • the superabrasive grains contain the first material in an amount of 0.1% by mass or more and less than 50% by mass. This makes it possible to provide a grindstone with better grinding performance.
  • the antioxidant film preferably covers 20% or more of the surface of the abrasive grain main body. This makes it possible to provide a grindstone with better grinding performance.
  • the grindstone of the present disclosure is a ring-shaped base metal, a superabrasive layer disposed on the surface of the base metal,
  • the superabrasive grain layer includes the superabrasive grains described in (1) to (5) above and a binder,
  • the softening point of the binder is 400°C or more and 1000°C or less. This makes it possible to provide a grindstone with excellent grinding performance.
  • the binder contains silicon, boron, and at least one element selected from the group consisting of alkali metal elements and alkaline earth metal elements,
  • the silicon content of the binder is 30% by mass or more and 70% by mass or less
  • the boron content of the bonding material is preferably 0% by mass or more and 30% by mass or less. This makes it possible to provide a grindstone with better grinding performance.
  • this embodiment An embodiment of the present disclosure (hereinafter referred to as “this embodiment”) will be described below. However, this embodiment is not limited to this.
  • the notation in the format "A to B” means the upper and lower limits of the range (i.e., from A to B), and when there is no unit described in A and only in B, The units of and the units of B are the same.
  • the superabrasive grain 10 is A superabrasive grain 10 comprising an abrasive grain main body part 1 and an oxidation prevention film 2 covering at least a part of the surface of the abrasive grain main body part 1,
  • the abrasive grain main body 1 is made of cubic boron nitride or diamond,
  • the average grain size of the abrasive main body portion 1 is less than 1.0 ⁇ m.
  • a grindstone containing superabrasive grains according to an embodiment of the present disclosure can have excellent grinding performance. The reason is presumed to be as follows.
  • the superabrasive grain 10 of the present disclosure at least a portion of the surface of the abrasive grain main body portion 1 is coated with an antioxidant film 2. Therefore, even in the firing process in the atmosphere when producing a grindstone using the superabrasive grains, the combustion reaction between the superabrasive grains and oxygen in the atmosphere can be suppressed. Therefore, it is presumed that the reduction in wear resistance caused by thermal deterioration and disappearance of the superabrasive grains can be suppressed, and the grinding performance of the grindstone is improved.
  • the superabrasive grains of the present disclosure do not require the addition of metals to lower the softening temperature of the binder during the manufacturing process of the grindstone, so the wear resistance of the grindstone due to elution of the metals into water is reduced. The decline can be prevented.
  • the grindstone containing the superabrasive grains according to this embodiment can have excellent grinding performance.
  • the abrasive grain main body portion according to this embodiment is made of cubic boron nitride or diamond.
  • cubic boron nitride or diamond is not limited to an embodiment consisting only of cubic boron nitride or diamond, but as long as the effects of the present disclosure are achieved, cubic boron nitride or diamond may be used together with cubic boron nitride or diamond.
  • This concept also includes embodiments containing components other than crystalline boron nitride and diamond (for example, unavoidable impurities).
  • unavoidable impurities in the abrasive grain body examples include carbon (C), aluminum (Al), silicon (Si), lithium (Li), calcium (Ca), and magnesium (Mg).
  • the content of unavoidable impurities in the abrasive grain body can be, for example, 0% or more and less than 1% on a mass basis.
  • the composition of the abrasive grain main body is determined by an energy dispersive X-ray analyzer (EDX) (Octane Elect Octane Elect) EDS System) (trademark).
  • EDX energy dispersive X-ray analyzer
  • the average grain size of the abrasive grain main body is less than 1.0 ⁇ m.
  • a grindstone including the abrasive grain main body has good sharpness, and the surface roughness of the machined surface can be made very small.
  • the average grain size of the abrasive grain body is 1.0 ⁇ m or more, the surface roughness of the machined surface tends to increase.
  • the lower limit of the average particle size of the abrasive grain main body is preferably 0.3 ⁇ m or more, more preferably 0.4 ⁇ m or more, and even more preferably 0.5 ⁇ m or more.
  • the upper limit of the average particle diameter of the abrasive grain main body is preferably 0.9 ⁇ m or less, more preferably 0.8 ⁇ m or less, and even more preferably 0.7 ⁇ m or less. Further, the average particle diameter of the abrasive grain main body is preferably 0.3 ⁇ m or more and 1.0 ⁇ m or less, more preferably 0.4 ⁇ m or more and 0.8 ⁇ m or less, and 0.5 ⁇ m or more and 0.7 ⁇ m or less. It is more preferable that
  • the average grain size of the abrasive grain main body can be specified by the following method. That is, after removing the antioxidant film by chemical treatment (the most suitable method is selected depending on the material), the volume-based D50 of the main body of the abrasive grain is measured using a particle size distribution meter.
  • the D50 is defined as the "average particle diameter of the abrasive grain main body". Note that the measurement method using the particle size distribution meter is the "laser diffraction method.”
  • the crystal structure of the abrasive grain main body can be single crystal or polycrystal.
  • the crystal structure of the abrasive grain body is single crystal, the strength of the abrasive grain body tends to improve.
  • the crystal structure of the abrasive grain main body is polycrystalline, the grinding ratio of a tool using an abrasive grain including the abrasive grain main body tends to be improved.
  • the crystal structure of the abrasive grain main body can be confirmed by X-ray diffraction.
  • the superabrasive according to this embodiment includes an oxidation-preventing film that covers at least a portion of the surface of the abrasive main body.
  • “coating at least a part of the surface of the abrasive grain body” means not only “coating the entire surface of the abrasive grain body” ( Figure 1), but also “covering the entire surface of the abrasive grain body” (Fig. 1). This concept also includes the case of "covering only a part of the surface” (FIG. 2).
  • the anti-oxidation film is preferably made of a first material described below.
  • “consisting of the first material” is not limited to an embodiment consisting only of the above first material, but as long as the effects of the present disclosure are achieved, components other than the above first material in addition to the above first material are used.
  • This concept also includes embodiments containing (for example, unavoidable impurities).
  • unavoidable impurities in the anti-oxidation film include C, Al, and Si.
  • the content of unavoidable impurities in the antioxidant film can be, for example, 0% or more and 1% or less on a mass basis.
  • the composition of the above-mentioned antioxidant film can be determined by ICP emission spectroscopy (high frequency inductively coupled plasma emission spectroscopy).
  • the first material is made of ceramic or glass.
  • thermal deterioration of the abrasive grains can be further suppressed in the production of whetstones, allowing the whetstone to have both superior sharpness and better abrasion resistance, resulting in better grinding performance. be able to.
  • the ceramics include one or more first elements selected from the group consisting of Group 4 elements, Group 5 elements, Group 6 elements of the periodic table, aluminum (Al), and silicon (Si), and oxygen. , and at least one second element selected from the group consisting of nitrogen, carbon, and boron.
  • the first material is the above-mentioned ceramic
  • the oxidation-preventing film made of such a first material has excellent hardness and excellent wear resistance, so that the abrasive grain main body portion is not easily damaged.
  • the Group 4 elements of the periodic table are titanium (Ti), zirconium (Zr), and hafnium (Hf).
  • Group 5 elements of the periodic table are vanadium (V), niobium (Nb), and tantalum (Ta).
  • Group 6 elements of the periodic table are chromium (Cr), molybdenum (Mo), and tungsten (W).
  • Examples of compounds (oxides) consisting of the first element and oxygen include titanium oxide (TiO 2 ), zirconium oxide (ZrO 2 ), hafnium oxide (HfO 2 ), vanadium oxide (V 2 O 5 ), and niobium oxide. (Nb 2 O 5 ), tantalum oxide (Ta 2 O 5 ), chromium oxide (Cr 2 O 3 ), molybdenum oxide (MoO 3 ), tungsten oxide (WO 3 ), aluminum oxide (Al 2 O 3 ), silicon oxide (SiO 2 ) can be mentioned.
  • Examples of compounds (nitrides) consisting of the first element and nitrogen include titanium nitride (TiN), zirconium nitride (ZrN), hafnium nitride (HfN), vanadium nitride (VN), niobium nitride (NbN), and tantalum nitride.
  • TiN titanium tantalum nitride
  • TiCrN titanium chromium nitride
  • TiMoN titanium molybdenum nitride
  • TiWN titanium tungsten nitride
  • ZrHfN zirconium hafnium nitride
  • ZrVN zirconium vanadium nitride
  • ZrNbN zirconium niobium nitride
  • Examples of compounds (carbides) consisting of the first element and carbon include titanium carbide (TiC), zirconium carbide (ZrC), hafnium carbide (HfC), vanadium carbide (VC), niobium carbide (NbC), and tantalum carbide ( TaC), chromium carbide ( Cr2C ), molybdenum carbide (MoC), tungsten carbide (WC), titanium zirconium carbide (TiZrC), titanium hafnium carbide (TiHfC), titanium vanadium carbide (TiVC), titanium niobium carbide (TiNbC), Titanium tantalum carbide (TiTaC), titanium chromium carbide (TiCrC), titanium molybdenum carbide (TiMoC), titanium tungsten carbide (TiWC), zirconium hafnium carbide (ZrHfC), zirconium vanadium carbide (ZrVC), zirconium n
  • Examples of compounds (carbonitrides) consisting of the first element, carbon, and nitrogen include titanium carbonitride (TiCN), zirconium carbonitride (ZrCN), hafnium carbonitride (HfCN), aluminum carbonitride (AlCN), and carbonitride. Silicon nitride (SiCN) can be mentioned.
  • Examples of compounds (borides) consisting of the first element and boron include titanium boride (TiB 2 ), zirconium boride (ZrB 2 ), hafnium boride (HfB 2 ), vanadium boride (VB 2 ), Niobium boride (NbB 2 ), tantalum boride (TaB 2 ), chromium boride (CrB 2 ), molybdenum boride (MoB 2 ), tungsten boride (WB), aluminum boride (AlB 2 ), silicon boride (SiB 4 ) can be mentioned.
  • Examples of compounds (oxynitrides) consisting of the first element, nitrogen, and oxygen include titanium oxynitride (TiON), zirconium oxynitride (ZrON), hafnium oxynitride (HfON), vanadium oxynitride (VON), and Niobium nitride (NbON), tantalum oxynitride (TaON), chromium oxynitride (CrON), molybdenum oxynitride (MoON), tungsten oxynitride (WON), aluminum oxynitride (AlON), silicon oxynitride (SiON), Sialon ( SiAlON).
  • the above compounds may be used alone or in combination of two or more.
  • the first material can include a solid solution derived from the compound described above.
  • the solid solution derived from the above compound means a state in which two or more types of the above compounds are dissolved in each other's crystal structure, and means an interstitial solid solution or a substitutional solid solution.
  • the glass examples include borosilicate glass (glass containing SiO 2 , B 2 O 3 , Al 2 O 3 , Fe 2 O 3 , CaO, MgO, Na 2 O, and K 2 O).
  • borosilicate glass glass containing SiO 2 , B 2 O 3 , Al 2 O 3 , Fe 2 O 3 , CaO, MgO, Na 2 O, and K 2 O.
  • the superabrasive grains preferably contain the first material in an amount of 0.1% by mass or more and less than 50% by mass. As a result, thermal deterioration of the abrasive grains can be further suppressed in the production of the whetstone, so that the whetstone can have both excellent sharpness and better wear resistance.
  • the lower limit of the content of the first material in the superabrasive grains is preferably 0.1% by mass or more, more preferably 1% by mass or more, and even more preferably 10% by mass or more, from the viewpoint of suppressing thermal deterioration of the abrasive grains.
  • the upper limit of the content of the first material of the superabrasive grains is preferably 49% by mass or less, more preferably 40% by mass or less, and even more preferably 30% by mass or less.
  • the content of the first material in the superabrasive grains is measured by the following procedure.
  • the superabrasive grains are subjected to ICP emission spectroscopy (high-frequency inductively coupled plasma emission spectroscopy).
  • the concentration of one element (group 4 element, group 5 element, group 6 element of the periodic table, aluminum (Al), and silicon (Si)) is measured.
  • the concentration of the compound (oxide, carbide, nitride, carbonitride, or boride) of the first element is converted to calculate the mass of the compound of the first element.
  • the first material is glass
  • elements other than oxygen for example, silicon ( Measure the concentrations of Si), boron (B), aluminum (Al), iron (Fe), calcium (Ca), magnesium (Mg), sodium (Na), and potassium (K)).
  • Si silicon
  • B aluminum
  • Fe iron
  • Ca calcium
  • Mg magnesium
  • Na sodium
  • K potassium
  • the antioxidant film preferably covers 20% or more of the surface of the abrasive grain body. As a result, thermal deterioration of the abrasive grains can be further suppressed in the production of whetstones, allowing the whetstone to have both superior sharpness and better abrasion resistance, resulting in better grinding performance. be able to.
  • the antioxidant film more preferably covers 50% or more of the surface of the abrasive grain main body, and still more preferably covers 70% or more. Moreover, it is more preferable that the antioxidant film covers 100% of the surface of the abrasive grain main body. From a manufacturing standpoint, the antioxidant film can cover 99% or less, 98% or less, or 97% or less of the surface of the abrasive grain main body. Further, the antioxidant film preferably covers 20% or more and 100% or less of the surface of the abrasive grain body, more preferably 50% or more and 100% or less, and 70% or more and 100% or less. More preferably, it is coated.
  • the proportion of the surface of the abrasive grain body covered with the antioxidant film can be determined by the following method.
  • (a1) Observe at a magnification of 5,000 to 200,000 times using a scanning electron microscope (SEM) equipped with energy dispersive X-ray analysis (EDS) to obtain a backscattered electron image of the superabrasive grain.
  • a measurement area is set in the backscattered electron image. The measurement area is set so that 100 or more superabrasive grains are included in the measurement area.
  • (c1) In the measurement region, identify the antioxidant film by mapping and analyzing the constituent elements of the first material using EDS, and measure the area A2 occupied by the antioxidant film in the measurement region (as shown in the figure). none).
  • the constituent elements of the first material on which the mapping analysis is performed are elements other than carbon, boron, and nitrogen.
  • the residual rate of the superabrasive grains in thermogravimetric analysis is preferably 70% or more.
  • the thermogravimetric analysis is performed under conditions of a temperature of 900° C. and a holding time of 0.5 hours. This makes it possible to further suppress thermal deterioration of the superabrasive grains in the production of grinding wheels, allowing the grinding wheels to have both superior sharpness and better wear resistance, resulting in better grinding performance. can be done.
  • the lower limit of the residual rate in thermogravimetric analysis of the superabrasive grains is more preferably 80% or more, and even more preferably 90% or more.
  • the upper limit of the residual rate in thermogravimetric analysis of the superabrasive grains is preferably 100% or less.
  • the residual rate of the superabrasive grains in thermogravimetric analysis can be set to 99.5% or less, 99.0% or less, or 98.5% or less from the viewpoint of manufacturing.
  • the residual rate of the superabrasive grains in thermogravimetric analysis is preferably 70% or more and 100% or less, more preferably 80% or more and 100% or less, and even more preferably 90% or more and 100% or less. .
  • the residual rate of the superabrasive in thermogravimetric analysis can be determined by performing the following thermogravimetric analysis on the superabrasive at a temperature of 900° C. and a holding time of 0.5 hours.
  • 30 mg (initial weight) of superabrasive grains is prepared and applied to a thermogravimetric (TG) meter (the TG meter can measure the weight change of a substance during heating in real time).
  • TG thermogravimetric
  • the temperature is raised from room temperature to 900°C at a heating rate of 10°C/min, and then 900°C is maintained for 30 minutes.
  • the atmosphere is atmospheric.
  • the remaining weight at this time is measured.
  • the method for producing superabrasive grains includes a step of preparing an abrasive grain main body made of cubic boron nitride or diamond (hereinafter also referred to as a "preparation step"), and a step of preparing an abrasive grain main body made of cubic boron nitride or diamond, and oxidizing the surface of the abrasive grain main body.
  • the method may include a step of forming a preventive film (hereinafter also referred to as a "coating step").
  • Cubic boron nitride or diamond which is the raw material for the abrasive grain body, is prepared.
  • Cubic boron nitride and diamond are not particularly limited, and known ones can be used.
  • Pretreatment can be performed on the prepared abrasive grain main body made of cubic boron nitride or diamond. Pretreatment includes heat treatment, electron beam irradiation, plasma irradiation, and microwave irradiation.
  • an anti-oxidation film is formed on the surface of the prepared abrasive grain main body.
  • the anti-oxidation film can be formed by the sol-gel method, by using crushed ceramics or crushed glass as a binder and adsorbing it to the abrasive grain body, or by electrostatically adsorbing crushed ceramics or crushed glass to the abrasive grain body. method, chemical vapor deposition, or sputtering using a target material.
  • sol-gel method When the first material is made of glass, a sol-gel method can be applied.
  • the main body of the abrasive grain is mixed with an alkoxide such as tetraethoxysilane.
  • an alkoxide such as tetraethoxysilane.
  • the alkoxide is hydrolyzed and polycondensed, thereby coating the main body of the abrasive grain with a sol. This is dried to form a gel, and then sintered at an appropriate temperature to turn the gel into glass and form an antioxidant film.
  • the ceramic or glass used is one that has been crushed in advance.
  • the abrasive grain body and ceramic or glass are uniformly mixed in a solvent (eg, water, alcohol, etc.) by a method such as a bead mill.
  • a solvent eg, water, alcohol, etc.
  • the mixing ratio of the abrasive grain main body and ceramic or glass is adjusted to obtain the desired grain size and coverage.
  • an organic binder such as polyvinyl alcohol (PVA). Selection of the appropriate binder type varies depending on the type of solvent mentioned above) is added, and the organic binder and the ceramic or glass are combined with the abrasive grains. Adsorb it to the main body.
  • the first material consists of a ceramic or an oxide
  • chemical vapor deposition methods can be used.
  • the abrasive grain main body is placed in a reaction tube.
  • a compound that easily vaporizes usually a halide, hydride, organometallic compound, etc.
  • a chemical reaction reaction/thermal decomposition. etc.
  • the reaction may require high temperatures depending on the substance being vaporized, but low temperature coatings are also possible using plasma chemical vapor deposition.
  • the first material is made of ceramics
  • the following conditions may be mentioned as the coating conditions.
  • an oxidation-preventing film made of ceramics (first material) can be formed on the surface of the abrasive grain main body.
  • Target material aluminum (metal)
  • Atmosphere Vacuum Discharge voltage: 125V or more and 250V or less
  • the grindstone 20 according to an embodiment of the present disclosure will be described using FIGS. 3 and 4.
  • the grindstone 20 according to this embodiment is a ring-shaped base metal 120; a superabrasive layer 12 disposed on the surface of the base metal 120;
  • the superabrasive grain layer 12 includes the superabrasive grains 10 according to the first embodiment and a bonding material 11,
  • the softening point of the bonding material 11 is 400°C or more and 1000°C or less.
  • the grindstone 20 according to an embodiment of the present disclosure can have excellent grinding performance.
  • the reason is presumed to be as follows.
  • the grindstone 20 of the present disclosure includes an annular base metal 120 and a superabrasive grain layer 12 disposed on the surface of the base metal 120. More specifically, as shown in FIGS. 3 and 4, the grinding wheel 20 includes a cup-shaped base metal 120 and a cup-shaped base metal 120, and a pair of metal parts spaced apart from each other along the circumferential direction on one end surface 121 (use surface) of the base metal 120. It is composed of a plurality of flat plate-shaped superabrasive grain layers 12 that are spaced apart and fixed.
  • Each superabrasive layer 12 is attached to the base metal 120 so that the circumferential end surface 111 of the superabrasive layer 12 is substantially parallel to the rotation axis of the grinding wheel 20, and the length direction of the superabrasive layer 12 is in the radial direction of the grinding wheel 20. It is fixed to one end surface 121 (use surface) of.
  • Each superabrasive layer 12 has a working surface 112 substantially perpendicular to the axis of rotation of the grinding wheel 20.
  • the superabrasive grain layer 12 includes the superabrasive grains 10 according to the present embodiment 1, and the superabrasive grains 10 according to the present embodiment 1 cover at least one surface of the abrasive grain main body 1, as described above. portion is coated with an anti-oxidation film 2. Therefore, even in the firing process in the atmosphere when manufacturing the grindstone 20 using the superabrasive grains 10, the combustion reaction between the superabrasive grains 10 and oxygen in the atmosphere can be suppressed. Therefore, it is presumed that the decrease in wear resistance caused by thermal deterioration and disappearance of the superabrasive grains 10 can be suppressed, and the grinding performance of the grindstone 20 is improved.
  • the superabrasive grain 10 of the present disclosure does not require the addition of metals to lower the softening temperature of the bonding material 11 in the manufacturing process of the grinding wheel 20, the grinding wheel 20 may be reduced due to elution of the metals into water. Decrease in wear resistance can be prevented.
  • the superabrasive layer 12 includes a binder 11, and the softening point of the binder 11 is 400°C or more and 1000°C or less. Since such a bonding material has excellent mechanical strength, the grindstone 20 can have excellent grinding performance.
  • the grindstone 20 according to this embodiment can have excellent grinding performance.
  • Examples of the material of the base metal include Al, Al alloy, iron and iron alloy, carbon tool steel, high speed tool steel, alloy tool steel, cemented carbide, and cermet.
  • the size of the base metal (inner/outer diameter, thickness) can be appropriately selected depending on, for example, the size of a machine tool such as a machining center in which the grindstone is installed, that is, the size of the workpiece.
  • a base metal of a known grindstone can be used as the base metal.
  • Superabrasive layer 12 is disposed on the surface of base metal 120 (FIG. 4).
  • the size (thickness and width) of the superabrasive grain layer 12 can be appropriately selected depending on the size (thickness and width) of the base metal 120.
  • the thickness refers to the length of the grindstone 20 along the radial direction, and the width refers to the length of the grindstone 20 along the axial direction.
  • the superabrasive layer according to this embodiment includes the superabrasive and the bonding material.
  • the above-mentioned grindstone can be made of the above-mentioned superabrasive grains and the above-mentioned bonding material. Further, the superabrasive layer may include pores as long as it exhibits the effects of the present disclosure. In the grindstone, the content of the pores may be 40% by volume or more and 95% by volume or less.
  • the lower limit of the content of the superabrasive is preferably 10% by volume or more, 15% by volume or more, or 20% by volume or more.
  • the upper limit of the content of the superabrasive is preferably 60% by volume or less, 50% by volume or less, and 40% by volume or less.
  • the content of the superabrasive grains is preferably 10 vol% or more and 60 vol% or less, 15 vol% or more and 50 vol% or less, and 20 vol% or more and 40 vol% or less.
  • the content of super-abrasive grains is determined by separating the abrasive grains and binder from a 1 cm3 piece of the cutting edge of the abrasive stone by chemical treatment, measuring the weight of the abrasive grains, and measuring the weight of the abrasive grains.
  • the volume is determined by dividing by the density (g/cm 3 ). Since this is the volume (cm 3 ) contained in 1 cm 3 , it can be specified by multiplying the numerical value of the volume by 100.
  • the "superabrasive content" has been measured multiple times by arbitrarily setting the cutting point of the grinding wheel edge and following the above procedure. It was also confirmed that there was little variation in the measurement results, and that even if the cutting point of the grindstone edge was set arbitrarily, it would not be arbitrary.
  • the lower limit of the content of the binder is preferably 1% by volume or more, 2% by volume or more, or 3% by volume or more.
  • the upper limit of the content of the binder is preferably 30% by volume or less, 20% by volume or less, and 10% by volume or less.
  • the content of the binder is preferably 1 volume % or more and 30 volume % or less, 2 volume % or more and 20 volume % or less, and 3 volume % or more and 10 volume % or less.
  • the content of the binder is determined by separating the abrasive grains and the binder from a 1cm3 piece of the cutting edge of the grinding wheel by chemical treatment, measuring the weight of the binder, and determining the content of the binder.
  • the volume is determined by dividing by the density (g/cm 3 ). Since this is the volume (cm 3 ) contained in 1 cm 3 , it can be specified by multiplying the numerical value of the volume by 100.
  • the superabrasive grain of Embodiment 1 is used.
  • the number of superabrasive grains can be plural.
  • a portion of the superabrasive grains 10 on the surface side of the superabrasive grain layer 12 is exposed from the bonding material 11, and the exposed portion has a cutting edge portion for grinding the work material.
  • all of the superabrasive grains 10 on the base metal 120 side of the superabrasive grain layer 12 are embedded in the bonding material 11.
  • the buried superabrasive grains 10 are removed during grinding of a workpiece with the grindstone 20, in the process in which the superabrasive grains 10 on the surface side of the superabrasive grain layer 12 wear out and fall off, and the bonding material 11 wears out. The part is exposed from the bonding material 11 and the workpiece is ground (FIG. 4).
  • All of the plurality of superabrasive grains may be composed of an abrasive grain body portion having the same configuration (material and size) and an oxidation prevention film having the same configuration (material and thickness). Further, the abrasive grain main body portion and oxidation prevention film of some superabrasive grains may have a different configuration (material and size) from the abrasive grain main body portion and oxidation prevention film of other portions of the superabrasive grain. Moreover, known abrasive grains other than superabrasive grains may be mixed in the superabrasive grain layer.
  • the bonding material 11 fixes the superabrasive grains 10 to one end surface 121 (usable surface) of the base metal 120 (FIG. 4).
  • Examples of the type of bonding material include one type of bond selected from vitrified bond, metal bond, and a composite bond of these, or metal solder. As these bonds and metal solders, known bonds and metal solders can be used.
  • vitrified bond is that the main component is glass.
  • metal bonds include copper-tin alloys.
  • metal solder include silver (Ag) solder.
  • the type of bonding material can be selected as appropriate depending on the material of the anti-oxidation film of the superabrasive grains.
  • the bonding material can be, for example, vitrified bond, metal bond, or metal solder.
  • the binder is preferably vitrified bond.
  • the softening point of the binder is 400°C or more and 1000°C or less. Since such a binding material has excellent mechanical strength, the grindstone can have excellent grinding performance.
  • the lower limit of the softening point of the binder is preferably 500°C or higher, more preferably 600°C or higher, and even more preferably 700°C or higher.
  • the upper limit of the softening point of the binder is preferably 950°C or lower, more preferably 900°C or lower, and even more preferably 850°C or lower.
  • the softening point of the binder is preferably 500°C or more and 950°C or less, more preferably 600°C or more and 900°C or less, and even more preferably 700°C or more and 850°C or less.
  • the above-mentioned softening point can be determined by extrapolating a straight line from two points where the curvature of the expansion curve characteristically changes when thermal expansion is measured in compression mode measurement using thermomechanical measurement (TMA), and finding it from the intersection of these points. .
  • TMA thermomechanical measurement
  • the binder contains silicon, boron, and at least one element selected from the group consisting of alkali metal elements and alkaline earth metal elements, and the silicon content of the binder is 30% by mass or more. It is preferably 70% by mass or less, and the boron content of the bonding material is preferably 0% by mass or more and 30% by mass or less. This further increases the affinity between the superabrasive grains provided with the oxidation-preventing film and the binder via the oxidation-preventing film. As a result, the grindstone can have better grinding performance.
  • the alkali metal elements include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
  • examples of alkaline earth metal elements include calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
  • the silicon content of the bonding material is more preferably 40% by mass or more, and even more preferably 50% by mass or more.
  • the silicon content of the bonding material is more preferably 60% by mass or less, and even more preferably 55% by mass or less.
  • the silicon content of the bonding material is more preferably 40% by mass or more and 60% by mass or less, and even more preferably 50% by mass or more and 55% by mass or less.
  • the boron content of the bonding material is more preferably 5% by mass or more, and even more preferably 10% by mass or more.
  • the boron content of the bonding material is more preferably 25% by mass or less, and even more preferably 20% by mass or less.
  • the boron content of the bonding material is more preferably 5% by mass or more and 25% by mass or less, and even more preferably 10% by mass or more and 20% by mass or less.
  • the composition of the binder can be identified by ICP emission spectroscopy (high frequency inductively coupled plasma emission spectroscopy).
  • the grinding wheel 20 (FIGS. 3 and 4) is prepared by preparing a plurality of superabrasive grains 10 (FIGS. 1 and 2) in which at least a portion of the surface of the abrasive grain main body 1 is coated with an anti-oxidation film 2, and applying a bonding material. 11, by fixing a plurality of superabrasive grains 10 to one end surface 121 (usable surface) of the base metal 120 (FIG. 4).
  • the grinding wheel 20 is prepared by preparing a plurality of abrasive grain main bodies 1 that are not coated with the anti-oxidation film 2, and bonding the plurality of abrasive grain main body parts 1 to one end surface 121 (usable surface) of the base metal 120 using a bonding material 11. After the abrasive particles are fixed, the anti-oxidation film 2 may be formed to cover the surface (cutting edge portion) of the abrasive grain body 1.
  • coating methods include the above-mentioned sol-gel method, a method in which crushed ceramics or crushed glass is adsorbed onto the abrasive grain body using a binder, and a method in which crushed ceramics or crushed glass is electrostatically applied to the abrasive grain body. Any of an adsorption method, a chemical vapor deposition method, and a sputtering method using a target material can be used.
  • the grindstone according to the embodiment can be suitably used for grinding automobile parts, optical glass, magnetic materials, semiconductor materials, etc., groove grinding of end mills, drills, reamers, etc., breaker grinding of indexable tips, and heavy grinding of various tools. .
  • thermogravimetric analysis residual rate [%] the residual ratio in thermogravimetric analysis of the superabrasive grains was determined by the method described in Embodiment 1. The obtained results are recorded in the "thermogravimetric analysis residual rate [%]" column in the "superabrasive” column of Tables 4 and 5.
  • the workpiece 130 is fixed on the table 110.
  • the table 110 is rotatable in the direction indicated by an arrow 110R.
  • the grindstone 20 is rotatable in the direction indicated by the arrow 1R.
  • the direction indicated by arrow 1F is the cutting direction.
  • the above samples 1 to 3, 9, 11 to 17, and 20 to 42 correspond to examples, and the above samples 4 to 6, 10, 18, and 19 correspond to comparative examples.
  • the grinding wheels of Samples 1 to 3, 9, 11 to 17, and 20 to 42 exhibited exceptionally high grinding ratios compared to the grinding wheels of Samples 4 to 6, 10, 18, and 19. Comparing samples with the same average particle diameter of the abrasive grain body, the grinding wheels of samples 1 to 3, 9, 11 to 17, and 20 to 42 are superior to those of samples 4 to 6, 10, 18, and 19. In comparison, it has exceptionally excellent sharpness and exceptionally excellent wear resistance. That is, the grindstones of Samples 1 to 3, 9, 11 to 17, and 20 to 42 have exceptionally excellent grinding performance compared to the grindstones of Samples 4 to 6, 10, 18, and 19.

Abstract

Ce grain superabrasif comprend une section corps de grain abrasif et un film antioxydant qui recouvre au moins une partie de la surface de la section corps de grain abrasif, la section corps de grain abrasif comprenant du nitrure de bore cubique ou du diamant et le diamètre de particule moyen de la section corps de grain abrasif étant inférieur à 1,0 µm.
PCT/JP2022/030622 2022-08-10 2022-08-10 Grain superabrasif et meule WO2024034076A1 (fr)

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PCT/JP2022/030622 WO2024034076A1 (fr) 2022-08-10 2022-08-10 Grain superabrasif et meule

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Application Number Priority Date Filing Date Title
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005072912A1 (fr) * 2004-01-28 2005-08-11 Kure-Norton Co., Ltd. Procédé de production d'une meule diamantée vitrifiée
JP2008513566A (ja) * 2004-09-23 2008-05-01 エレメント シックス （プロプライエタリイ）リミテッド 被覆した研磨材料及びその製造方法
JP2017521274A (ja) * 2014-07-01 2017-08-03 ダイヤモンド イノヴェーションズ インコーポレイテッド ガラス被覆ｃｂｎ研磨材とその作製方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005072912A1 (fr) * 2004-01-28 2005-08-11 Kure-Norton Co., Ltd. Procédé de production d'une meule diamantée vitrifiée
JP2008513566A (ja) * 2004-09-23 2008-05-01 エレメント シックス （プロプライエタリイ）リミテッド 被覆した研磨材料及びその製造方法
JP2017521274A (ja) * 2014-07-01 2017-08-03 ダイヤモンド イノヴェーションズ インコーポレイテッド ガラス被覆ｃｂｎ研磨材とその作製方法

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