WO2019193887A1 - Meule vitrifiée dotée d'une structure homogène à texture rugueuse - Google Patents

Meule vitrifiée dotée d'une structure homogène à texture rugueuse Download PDF

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Publication number
WO2019193887A1
WO2019193887A1 PCT/JP2019/008220 JP2019008220W WO2019193887A1 WO 2019193887 A1 WO2019193887 A1 WO 2019193887A1 JP 2019008220 W JP2019008220 W JP 2019008220W WO 2019193887 A1 WO2019193887 A1 WO 2019193887A1
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WO
WIPO (PCT)
Prior art keywords
vitrified
grindstone
abrasive grains
volume ratio
abrasive
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PCT/JP2019/008220
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English (en)
Japanese (ja)
Inventor
康清 小笠原
友則 水谷
紘史 大山
Original Assignee
株式会社ノリタケカンパニーリミテド
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Application filed by 株式会社ノリタケカンパニーリミテド filed Critical 株式会社ノリタケカンパニーリミテド
Priority to EP19781836.2A priority Critical patent/EP3778120A4/fr
Priority to CN201980024619.7A priority patent/CN112135710A/zh
Priority to KR1020207031880A priority patent/KR20200138393A/ko
Priority to US17/045,598 priority patent/US20210362298A1/en
Publication of WO2019193887A1 publication Critical patent/WO2019193887A1/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
    • B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
    • 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
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
    • B24D3/14—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings
    • B24D3/18—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings for porous or cellular structure

Definitions

  • the present invention relates to a vitrified grindstone having a coarse structure and a homogeneous structure having a low abrasive volume ratio and many pores, which is suitably applied to a field in which grinding load is high and grinding burn is likely to occur on a workpiece.
  • a high-porosity vitrified grinding wheel is known as a grinding wheel that is suitably applied to fields in which grinding load is high and grinding burn is likely to occur on a workpiece, such as internal grinding and angular grinding.
  • a workpiece such as internal grinding and angular grinding.
  • the high-porosity CBN vitrified grinding wheel described in Patent Document 1 is this.
  • pores are artificially formed by the pore-forming material to obtain a high porosity.
  • grinding heat is easily released during grinding under the grinding fluid, and the workpiece is ground. Burning is suitably suppressed.
  • a vitrified grindstone having a coarse structure that forms air holes as a result in order to maintain a wide abrasive interval.
  • the prior art has a drawback that the grindstone structure tends to be heterogeneous in order to form air holes.
  • an organic pore forming material that burns out during the grinding of the grindstone is used to form pores, there is a disadvantage that the abrasive particles are likely to aggregate when the abrasive grains are rearranged by firing shrinkage.
  • Patent Document 2 low-abrasion is achieved by forming pores using an alumina balloon to form a homogeneous grindstone structure, thereby increasing the contact ratio between the abrasive grains and reducing the abrasive volume ratio to some extent.
  • a vitrified grindstone having a grain ratio, multi-pores and a homogeneous structure is formed. Thereby, aggregation of the abrasive grains when the abrasive grains are rearranged by firing shrinkage is suppressed, and the occurrence of grinding burn and shape wear is suppressed.
  • the present invention has been made against the background of the above circumstances, and the object of the present invention is to provide a rough structure that can be ground without causing burning while maintaining shape maintainability even for difficult-to-cut materials. It is an object of the present invention to provide a vitrified grinding wheel having a uniform structure.
  • the present inventors suppress burning of the work material without deteriorating the shape maintaining property of vitrified grindstones having a large pore and a coarse structure whose abrasive volume ratio is less than 40% by volume, for example.
  • abrasive volume ratio As a result of various investigations on the abrasive volume ratio and the homogeneity of the grindstone structure, it was possible to obtain a low abrasive volume ratio, which was previously thought to be inferior in shape maintenance, using inorganic hollow fillers.
  • the inventors have found the surprising fact that, if the homogeneity of the grinding wheel structure is increased, the shape maintaining property (reduction of grinding wheel wear amount) is maintained, and even a difficult-to-cut material can provide a grinding burn suppressing effect.
  • the present invention has been made based on this finding.
  • the abrasive volume fraction By reducing the abrasive volume fraction, the dispersion of the inorganic hollow filler filled at a ratio within a predetermined range with respect to the abrasive volume fraction is promoted, so that the abrasive grains and the inorganic hollow filler are close to each other.
  • the burnability of the work material was suitably suppressed while maintaining the shape maintainability.
  • the gist of the vitrified grindstone having a coarse structure homogeneous structure according to the first invention is a vitrified grindstone having a coarse structure homogenous structure in which abrasive grains and an inorganic hollow filler are bound together by an inorganic binder, Filled at a volume ratio of 23 to 35 vol%, and a standard of 10 or less in the frequency distribution chart of the abrasive grain area ratio, which is the ratio of the solid matter including the abrasive grains per unit area at a plurality of locations in the cross section of the vitrified grindstone It has a homogeneity with a deviation.
  • the gist of the second invention is that, in the first invention, the inorganic hollow filler has an average particle size of 1.6 times or less with respect to the abrasive grains.
  • the gist of the third invention is that, in the first invention or the second invention, the inorganic hollow filler is filled at a volume ratio of 0.2 to 1.7 times the volume ratio of the abrasive grains. There is to be.
  • the gist of the fourth invention is that, in any one of the first to third inventions, the inorganic binder is mixed at a volume ratio of 10 to 15 vol%.
  • the gist of the fifth invention is that, in any one of the first to fourth inventions, the homogeneity having a standard deviation of 6.5 to 8.7 in the frequency distribution diagram of the abrasive grain area ratio. It is in having.
  • the gist of the sixth invention is that, in any one of the first to fifth inventions, the inorganic hollow filler is filled at a volume ratio of 4 to 45 vol%.
  • the gist of the seventh invention is that, in any one of the first to sixth inventions, the inorganic hollow filler has an average particle size of 0.6 to 1.6 times the abrasive grains. It is in having.
  • the gist of the eighth invention is that, in any one of the first to seventh inventions, the inorganic hollow filler is 0.2 to 1.67 times the volume fraction of the abrasive grains. It has a volume ratio.
  • the gist of the ninth invention is that, in any one of the first to seventh inventions, the abrasive is an alumina abrasive or a silicon carbide abrasive, and the grain size of the abrasive is: F80 to F120.
  • a vitrified grindstone having a coarse structure and a homogeneous structure in which abrasive grains and an inorganic hollow filler are bound together by an inorganic binder, wherein the abrasive grains are filled at a ratio of 23 to 35 vol%. It has a homogeneity having a standard deviation of 8.5 or less in the frequency distribution diagram of the abrasive grain area ratio, which is the ratio of the solid matter containing the abrasive grains per unit area at a plurality of locations in the cross section of the grindstone.
  • the inorganic hollow filler has an average particle size of 1.6 times or less with respect to the abrasive grains. Accordingly, a vitrified grindstone having a multi-porous and homogeneous structure having a grindstone structure with high homogeneity can be obtained.
  • the inorganic hollow filler is filled at a volume ratio of 0.2 to 1.7 times the volume ratio of the abrasive grains. Accordingly, a vitrified grindstone having a multi-porous and homogeneous structure having a grindstone structure with high homogeneity can be obtained.
  • the inorganic binder is mixed at a volume ratio of 10 to 15 vol%. From this, a highly porous vitrified grindstone having a high porosity and a homogeneous structure can be obtained.
  • the homogeneity having a standard deviation of 6.5 to 8.7 is provided in the frequency distribution diagram of the abrasive grain area ratio. Therefore, even if it is a low abrasive grain volume ratio, the homogeneity of a grindstone structure is high and shape maintainability (decrease in grinding wheel wear amount) is maintained.
  • the inorganic hollow filler is filled at a volume ratio of 4 to 45 vol%. From this, a multi-pore vitrified grindstone can be obtained with a low abrasive volume ratio.
  • the inorganic hollow filler has an average particle size 0.6 to 1.6 times that of the abrasive grains. From this, a multi-pore vitrified grindstone can be obtained with a low abrasive volume ratio.
  • the inorganic hollow filler has a volume ratio of 0.2 to 1.67 times the volume ratio of the abrasive grains. From this, a multi-pore vitrified grindstone can be obtained with a low abrasive volume ratio.
  • the gist of the ninth invention is that, in any one of the first to seventh inventions, the abrasive is an alumina abrasive or a silicon carbide abrasive, and the grain size of the abrasive is: F80 to F120. This makes it possible to grind difficult-to-cut materials using general abrasive grains without grinding burn.
  • FIG. 1 It is a front view which shows the multi-porous and homogeneous structure vitrified grindstone of one Example of a present Example. It is a figure explaining the grinding example by the grinding apparatus using the vitrified grindstone of FIG. It is process drawing explaining the principal part of the manufacturing method of the vitrified grindstone of FIG. It is a schematic diagram which expands and demonstrates the rough structure of the vitrified grindstone of FIG. In order to confirm the relationship between the abrasive volume ratio and the homogeneity of the grindstone structure, a plurality of types of test pieces (Example product 1-4, Comparative product 1-3) in which the composition of the vitrified grindstone in FIG. 1 was changed were used.
  • 12 is a graph showing the grinding wheel wear amount as a result of the grinding wheel grinding test of Comparative Example Product 5, Comparative Example Product 6 and Example Product 22 having a large homogeneity difference in FIG. 11 in comparison.
  • 12 is a photograph showing a burned state of a work material in a grinding test using Comparative Example Product 4 of FIG. 11. It is a photograph which shows the burned state of the work material in the grinding test by the comparative example product 5 of FIG. 12 is a photograph showing a burned state of a work material in a grinding test using Comparative Example Product 6 of FIG. 11.
  • 12 is a photograph showing a burned state of a work material in a grinding test using the example product 22 of FIG.
  • the inorganic hollow filler for example, a shirasu balloon, an alumina balloon, a mullite balloon, a glass balloon or the like is preferably used.
  • FIG. 1 shows an example of a vitrified grindstone 10 which is a high porosity vitrified grindstone having a multi-pore and homogeneous structure according to an embodiment of the present invention.
  • the vitrified grindstone 10 has a disk shape as a whole, and is rotationally driven around the axis C in a state where the vitrified grindstone 10 is attached to the main shaft of the grinding machine using an attachment hole 12 formed in the center thereof.
  • the work material 16 is ground by bringing the work material 16 into sliding contact with the tapered outer peripheral grinding surface 14 of the vitrified grindstone 10.
  • FIG. 2 shows a case where the corner 18 of a rectangular parallelepiped work material 16 made of a heat-resistant alloy such as Inconel (registered trademark) is ground.
  • the outer peripheral grinding surface 14 is pressed against the corner of the rectangular parallelepiped work material 16, and the work material 16 is sent in the longitudinal direction, that is, the direction perpendicular to the paper surface of FIG.
  • the corner 18 of the work material 16 is ground.
  • FIG. 4 is a schematic diagram for explaining the structure of the vitrified grindstone 10 in an enlarged manner.
  • abrasive grains 20 made of general abrasive grains such as alumina-based abrasives and silicon carbide-based abrasives
  • inorganic hollow fillers 22 made of, for example, shirasu balloons, alumina balloons, mullite balloons, glass balloons, etc. are made of glass.
  • the vitrified bonds 24, which are high quality inorganic binders, are bonded together by melting. Between these abrasive grains 20, the inorganic hollow filler 22, and the vitrified bond 24, pores 26 that are naturally formed by the disappearance of the binder (molding aid) and the like in the manufacturing process are formed.
  • the abrasive grains 20 are filled with an abrasive volume ratio of 23 to 35 vol%, and the frequency of the abrasive area ratio, which is the ratio of the solid matter including the abrasive grains 20 per unit area at a plurality of locations in the cross section of the vitrified grinding stone 10. It has homogeneity with a standard deviation of 8.5 or less in the distribution diagram.
  • the vitrified whetstone 10 is a vitrified whetstone having a multi-porous and homogeneous structure that has a very low abrasive volume ratio and nevertheless maintains the grindstone shape maintainability by the homogeneity of the grindstone structure. is there.
  • the inorganic hollow filler 22 is filled at a filler volume ratio of 0.2 to 1.7 times the abrasive grain volume ratio.
  • the inorganic hollow filler 22 is filled at a rate of 4 to 45 vol%.
  • the inorganic hollow filler 22 has an average particle size of 1.6 times or less with respect to the average particle size of the abrasive grains 20, and preferably has an average particle size in the range of 0.6 to 1.4 times. It has a particle size.
  • the inorganic hollow filler 22 has a volume ratio of 0.2 to 1.67 times, preferably 0.43 to 1.4 times the volume of the abrasive grains 20 in the vitrified grindstone 10. Yes.
  • vitrified bond (inorganic binder) 24 is mixed at a volume ratio of 10 to 15 vol%.
  • the vitrified grindstone 10 is 10 or less, preferably 6. in the frequency distribution diagram of the abrasive grain area ratio, which is the ratio of the solid matter containing the abrasive grains 20 per unit area at a plurality of locations in the cross section of the grindstone. It has homogeneity with a standard deviation of 5 to 8.5.
  • the vitrified grindstone 10 is manufactured, for example, according to the process diagram shown in FIG. That is, first, in the abrasive bond coating process P1, the abrasive grains 20 and a glass powder excellent in high impact resistance and heat resistance that are frited after melting, for example, an average grain of 1/10 or less of the abrasive grains 20
  • the vitrified bond 24 (inorganic binder) is mixed with a powdered vitrified bond 24 having a diameter together with a well-known binder (molding aid) such as a synthetic glue represented by dextrin.
  • a coating composed of 24 and a binder is formed in a layered manner on the outer surface of the abrasive grain 20, and is dried as necessary to give a further fluidity.
  • the inorganic hollow filler 22 made of, for example, mullite balloon is mixed with a vitrified bond 24 similar to the above together with a well-known binder such as dextrin.
  • a coating composed of the vitrified bond 24 and the binder is formed in a layered manner on the outer peripheral surface of the inorganic hollow filler 22, and is dried as necessary, thereby providing further fluidity.
  • the vitrified bond 24 is a glass powder having high impact resistance and excellent heat resistance.
  • the oxide composition is SiO 2 50 to 80 wt%, B 2 O 3 10 to 20 wt%, Al 2 O 3 5 to 15% by weight, glass frit in which the total of metal oxides selected from CaO, MgO, K 2 O, and Na 2 O is 8 to 15% by weight, or oxide composition is 70 to 90% by weight of SiO 2 , B 2 O 3 10 ⁇ 20 wt%, Al 2 O 3 1 ⁇ 5 wt%, such as glass frit, which is a Na 2 O 3 1 ⁇ 5 wt%, i.e. composed of fritted powders glass after melting.
  • the vitrified bond 24 may be added with a clay or the like in the above powder glass.
  • the vitrified bond 24 is preferably a rounded particle obtained by wet pulverization, has a single volume ratio of 55 vol% or more when a molding pressure of 300 kg / mm 2 is applied, and is ASTM D2840.
  • the apparent density (bulk specific gravity) is 1.2 or more according to the measurement conforming to the standard.
  • the abrasive grains 20 have, for example, a particle size in the range of F80 to F120, for example, an average particle size in the range of about 180 ⁇ m to 106 ⁇ m, and are filled at a rate of 23 to 35 vol%.
  • Inorganic hollow filler 22 for example, apparent density of 0.5 ⁇ 1.0g / cm 3, a bulk density of 0.25 ⁇ 0.45g / cm 3, compressive strength of 70N / mm 2, 1200 °C melting point above, It is a closed type hollow particle having substantially zero water absorption.
  • the inorganic hollow filler 22 has a filler volume ratio of 0.4 to 1.7 times the abrasive grain volume ratio of the abrasive grains 20, a volume ratio of 15 to 45 vol%, and the volume of the abrasive grains 20. Formulated to have a volume ratio of 0.43 to 1.67.
  • the mixing step P3 the abrasive grains 20 and the inorganic hollow filler 22 each coated with the above coating are introduced into a mixer together with a well-known binder such as dextrin, and mixed uniformly there.
  • the molding step P4 the mixed material is filled in a predetermined press mold for forming a cylindrical molding space and molded by being pressed by a press.
  • the molded product that has passed through the molding step P4 is sintered under firing conditions in which a temperature of, for example, about 900 ° C. is maintained for 0.5 hours in a predetermined firing furnace. By this sintering, the binder is burned off and the vitrified bond 24 is melted to form a molten glass body.
  • the abrasive grains 20 and the inorganic hollow filler 22 are formed.
  • the vitrified grindstone 10 is formed by being bonded to each other through the melted vitrified bond 24.
  • the finishing step P6 the vitrified grindstone 10 is manufactured by mechanically finishing with a cutting or grinding tool so that the outer dimensions such as the outer peripheral surface and the end surface become predetermined product standards, and the inspection step P7 is performed. Shipped after.
  • the grindstone structure that contributes relatively to the grinding performance and the grindstone 20 together with the grindstone 20 A vitrified grindstone structure formed by vitrified bond 24 in a state where the inorganic hollow filler 22 to be configured is uniformly filled in a predetermined space is formed, and the abrasive grains 20 and the inorganic hollow filler 22 are formed by the above-described blending.
  • a relatively uniform distance is formed between the abrasive grains 20 via the inorganic hollow filler 22, so that there is little occurrence of grinding burn and a long grindstone life is obtained.
  • the abrasive grains 20 and the inorganic hollow filler 22 are uniformly dispersed and bonded together by vitrified bonds 24 in contact with or in close proximity to each other, the shape maintaining property is improved.
  • the present inventors set the dispersibility of the abrasive grains 20 with respect to changes in the abrasive volume fraction and the material of the pore forming material, changes in the grain size of the abrasive grains, and changes in the volume fraction of the inorganic hollow filler.
  • the following homogeneity evaluation test 1, homogeneity evaluation test 2, and homogeneity evaluation test 3 were performed. In these tests, a different composition was used and the same process as that shown in FIG. 3 was used, and the cross-sectional images thereof were taken with a digital microscope and binarized from the cross-sectional images.
  • abrasive grains of Alundum (registered trademark) particle size F100 which is a typical alumina-based abrasive grain.
  • the same process as FIG. 3 is performed by mixing together with the pore-forming material at a grain volume ratio of 23%, 27%, 31%, and 35% (low abrasive ratio corresponding to the structure 20, 18, 16, 14).
  • Example product 1 to Example product 4 and Comparative example product 1 to Comparative product 3 are produced as test pieces of the vitrified grindstone produced by using each of them, and the standard deviation ⁇ as described above from the cross-sectional images of the test pieces. Was measured respectively.
  • FIG. 5 shows the composition and standard deviation ⁇ of the test pieces
  • FIG. 6 shows the evaluation results in a graph.
  • mullite balloon inorganic hollow filler
  • Comparative Example Product 1 to Comparative Example Product 3 an organic pore forming material having an average particle diameter of 250 ⁇ m is used as the pore forming material.
  • the firing shrinkage is relatively small and the abrasive grain spacing can be maintained, and the standard deviation ⁇ is It was 7.6 to 8.4, well below 10.
  • FIG. 21 shows the composition and standard deviation ⁇ of the test pieces, respectively, and FIG. 10 is a graph showing the evaluation results of the test pieces.
  • the volume ratio of the inorganic hollow filler (mullite balloon) to the abrasive grains is 0.43 to 1 at any of the abrasive grain volume ratios of 35%, 31%, 27%, and 26%. In the range of 67, the standard deviation ⁇ was 8.5 or less.
  • the volume ratio of the inorganic hollow filler to the abrasive grains decreases regardless of the abrasive volume ratio.
  • a hyperbolic tendency characteristic in which the standard deviation ⁇ is increased is shown. In the linear shape of the tendency characteristic, even if the volume ratio of the inorganic hollow filler to the abrasive grains is 0.35, the standard deviation ⁇ is 10 or less. Is obtained.
  • abrasive grain size F80 which is Alundum (registered trademark)
  • the comparative example product 4 and the structure 14 abrasive volume ratio
  • Comparative Example Products 5 and 6 and Example Product 22 were prepared using the steps shown in FIG. 3, respectively, and the cross-sectional images of these test pieces were evaluated as described above to evaluate their homogeneity. Each ⁇ was measured.
  • the standard deviations ⁇ of the comparative example products 5 and 6 and the example product 22 are made different depending on the change in the volume ratio of the vitrified bond.
  • FIG. 11 shows the composition and standard deviation ⁇ of the test pieces, respectively.
  • the standard deviation ⁇ of the comparative example products 4, 5 and 6 was 8.8, 11.3 and 10.6, whereas the standard deviation ⁇ of the example product 22 was 9.8 which is 10 or less. there were.
  • FIG. 12 is a graph showing the grinding wheel wear volume ratio (%) when the comparative product 4 is 100%, which is the grinding result of the comparative product 4 and the working product 22.
  • the grinding wheel wear volume represents the shape maintainability of the vitrified grinding wheel.
  • the example product 22 is superior in shape maintenance to the comparative example product 4 having the same homogeneity (standard deviation of 10 or less) due to the difference in structure of the grindstone.
  • FIG. 13 is a graph showing the grinding wheel wear volume ratio (%) when the comparative product 5 is 100%, which is the grinding result of the comparative product 5 and the comparative product 6 and the example product 22.
  • the example product 22 is superior in shape maintainability to the comparative product 4 having the same structure (abrasive grain volume ratio) due to the homogeneity of the grindstone.
  • FIG. 14, FIG. 15, FIG. 16, and FIG. 17 are photographs showing the burned state of the work material after the grinding test by Comparative Example Product 4, Comparative Example Product 5, Comparative Example Product 6, and Example Product 22. Each is shown. In each photograph, the white part shows burn. As shown in FIGS. 14, 15, 16, and 17, the example product 22 has the least amount of grinding burn, and the comparative example product 6 and the comparative example product 5 are successively burned. This indicates that even if the structure (abrasive grain volume ratio) is the same, as the homogeneity of the grindstone decreases and the standard deviation increases, the burn increases. Further, the grinding burn of the example product 22 is less burned than the comparative example product 4. This indicates that even if the standard deviation is equal to or less than 10, the burn-in decreases with the difference in structure, that is, the smaller the abrasive volume ratio.
  • the abrasive grains 20 are filled at a rate of 23 to 35 vol%, and per unit area at a plurality of locations in the cross section of the vitrified grindstone 10.
  • the frequency distribution diagram of the abrasive grain area ratio which is the ratio of the solid matter containing the abrasive grains.
  • the inorganic hollow filler 22 has an average particle diameter of 1.6 times or less with respect to the abrasive grains 20. For this reason, the vitrified whetstone 10 of the coarse structure homogeneous structure with a high porosity provided with the whetstone structure with high homogeneity is obtained.
  • the inorganic hollow filler 22 is filled at a filler volume ratio of 0.4 to 1.7 times the abrasive grain volume ratio. For this reason, the vitrified whetstone 10 of the coarse structure homogeneous structure with a high porosity provided with the whetstone structure with high homogeneity is obtained.
  • the vitrified bond (inorganic binder) 24 is mixed at a volume ratio of 10 to 15 vol%. From this, a vitrified grindstone 10 having a high porosity and a coarse structure homogeneous structure can be obtained.
  • the homogeneity having a standard deviation of 6.5 to 8.5 is provided in the frequency distribution diagram of the abrasive grain area ratio.
  • the inorganic hollow filler 22 is filled at a rate of 15 to 45 vol%, so that the coarse structure homogeneous structure having a low abrasive grain volume ratio and a high porosity. Vitrified grinding wheel is obtained.
  • the inorganic hollow filler 22 has an average particle diameter of 0.6 to 1.6 times that of the abrasive grains 20, and thus is low.
  • a vitrified grindstone having a high-porosity coarse-grained structure with an abrasive grain volume ratio is obtained.
  • the inorganic hollow filler 22 has a volume ratio of 0.43 to 1.67 times the volume ratio of the abrasive grains 20.
  • a vitrified grindstone having a coarse structure and a homogeneous structure having a low abrasive volume fraction and a high porosity can be obtained.
  • the abrasive grains 20 are an alumina abrasive or a silicon carbide abrasive, and the abrasive grains have a particle size of F80 to F120.
  • the vitrified grindstone 10 of the above-described embodiment has a disk shape as shown in FIG. 1, for example, but may have another shape such as a cup shape or a block shape.
  • Vitrified grinding wheel 20 Abrasive grain 22: Inorganic hollow filler 24: Vitrified bond (inorganic binder)

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
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  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)

Abstract

La présente invention concerne une meule vitrifiée dotée d'une structure homogène à texture rugueuse (poreuse), la meule vitrifiée étant capable de meuler même des matériaux difficiles à couper sans générer de brûlure et tout en conservant des propriétés de maintien de forme. Selon cette meule vitrifiée dotée d'une structure homogène à texture rugueuse, des grains abrasifs remplissent la meule vitrifiée à une proportion de 23 à 35 % en volume conjointement avec une charge creuse inorganique, les grains abrasifs étant homogènes de manière à avoir un écart-type σ inférieur ou égal à 8,7 dans une carte de distribution de fréquence de la zone de grains abrasifs, qui est une proportion de solides comprenant les grains abrasifs par zone unitaire en une pluralité d'emplacements dans une section transversale de la meule vitrifiée. Il en résulte une homogénéité élevée dans une structure de meule et maintient des propriétés de maintien de forme (réduction de la quantité d'usure de la meule) même par rapport à une texture rugueuse ayant un faible rapport volumique de grains abrasifs et, par conséquent, la génération de brûlures dans un matériau à couper est supprimée tandis que les propriétés de maintien de forme sont maintenues même par rapport à des matériaux difficiles à couper.
PCT/JP2019/008220 2018-04-06 2019-03-01 Meule vitrifiée dotée d'une structure homogène à texture rugueuse WO2019193887A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP19781836.2A EP3778120A4 (fr) 2019-03-01 Meule vitrifiée dotée d'une structure homogène à texture rugueuse
CN201980024619.7A CN112135710A (zh) 2018-04-06 2019-03-01 粗组织均质结构的陶瓷磨石
KR1020207031880A KR20200138393A (ko) 2018-04-06 2019-03-01 거친 조직 균질 구조의 비트리파이드 지석
US17/045,598 US20210362298A1 (en) 2018-04-06 2019-03-01 Vitrified grinding stone having open and homogeneous structure

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JP2018-074258 2018-04-06
JP2018074258A JP2019181613A (ja) 2018-04-06 2018-04-06 粗組織均質構造のビトリファイド砥石

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JP (1) JP2019181613A (fr)
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CN (1) CN112135710A (fr)
TW (1) TW201943500A (fr)
WO (1) WO2019193887A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US11999029B2 (en) 2018-06-29 2024-06-04 Saint-Gobain Abrasives, Inc. Abrasive articles and methods for forming same

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CN112936121B (zh) * 2021-04-13 2022-09-23 苏州科技大学 超硬磨料砂轮工作层及其制备方法、超硬磨料砂轮
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TW201943500A (zh) 2019-11-16
CN112135710A (zh) 2020-12-25

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