WO2022202722A1 - Meule équipée d'un arbre, procédé de chanfreinage, procédé de fabrication de plaque de verre, et plaque de verre - Google Patents

Meule équipée d'un arbre, procédé de chanfreinage, procédé de fabrication de plaque de verre, et plaque de verre Download PDF

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Publication number
WO2022202722A1
WO2022202722A1 PCT/JP2022/012894 JP2022012894W WO2022202722A1 WO 2022202722 A1 WO2022202722 A1 WO 2022202722A1 JP 2022012894 W JP2022012894 W JP 2022012894W WO 2022202722 A1 WO2022202722 A1 WO 2022202722A1
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WO
WIPO (PCT)
Prior art keywords
glass plate
grindstone
shaft
chamfered
less
Prior art date
Application number
PCT/JP2022/012894
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English (en)
Japanese (ja)
Inventor
丈彰 小野
Original Assignee
Ａｇｃ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ａｇｃ株式会社 filed Critical Ａｇｃ株式会社
Priority to JP2023509155A priority Critical patent/JPWO2022202722A1/ja
Priority to CN202280023791.2A priority patent/CN117042919A/zh
Publication of WO2022202722A1 publication Critical patent/WO2022202722A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
    • 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
    • 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
    • B24D3/06—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 metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/02—Wheels in one piece
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C19/00—Surface treatment of glass, not in the form of fibres or filaments, by mechanical means

Definitions

  • the present invention relates to a mounted grindstone, a chamfering method, a glass plate manufacturing method, and a glass plate.
  • Patent Literature 1 describes a plate glass chamfering machine that chamfers a plate glass with an end face of a wheel-shaped grindstone. In this sheet glass chamfering machine, the beveling is performed at a desired angle by adjusting the inclination angle of the grinding wheel with respect to the sheet glass.
  • Patent Document 2 describes an end face grinding apparatus that chamfers the end face of a glass substrate by grinding it with a rotating grindstone.
  • the plate glass chamfering machine described in Patent Document 1 cannot greatly change the inclination angle of the grinding wheel with respect to the plate glass. Therefore, for example, when the plate glass has a complicated shape such as an S-shape, it is not possible to chamfer the entire range by adjusting the tilt angle. Even if the processing machine is configured so that the tilt angle can be changed greatly, the control becomes complicated. Moreover, the end face grinding apparatus described in Patent Document 2 cannot be applied to an article having a shape that varies in thickness. In order to deal with more complicated shapes, it is conceivable to use a 5-axis machine, but generally the 5-axis machine is expensive and the control becomes more complicated.
  • the present invention has been made in view of the above, and has a mounted grindstone, a chamfering method, a glass plate manufacturing method, and a chipping-suppressed glass that can suppress chipping that occurs in the chamfered portion of an article with a simple configuration.
  • the purpose is to provide a board.
  • a shaft-mounted grindstone according to the present invention is provided with a shaft portion and an end portion of the shaft portion, which is recessed toward the shaft center side with a predetermined radius of curvature. and a grindstone having a processing surface having a curved shape at its end.
  • the chamfering method according to the present invention chamfers an article with the processing surface using the grindstone with a shaft.
  • the glass plate manufacturing method according to the present invention chamfers the glass plate as the article by the chamfering method described above.
  • a glass plate according to the present invention includes a chamfered portion having an outwardly convex shape with a predetermined curvature radius at an end portion, A predetermined radius of curvature is 5 mm or more and 35 mm or less, the width of the chamfered portion is 0.05 mm or more and 1.0 mm or less, and at least one curved portion is provided that curves when viewed in a direction perpendicular to the thickness direction.
  • a glass plate according to the present invention includes a chamfered portion having an outwardly convex shape with a predetermined curvature radius at an end portion,
  • the predetermined radius of curvature is 5 mm or more and 35 mm or less
  • the width of the chamfered portion is 0.05 mm or more and 1.0 mm or less, extends in one direction in a direction perpendicular to the thickness direction, and has a maximum thickness and a minimum thickness. The difference is 1% or more with respect to the plate thickness.
  • the mounted grindstone, the chamfering method, the glass plate manufacturing method, and the glass plate according to the present invention have the effect of being able to suppress chipping that occurs in the chamfered portion of an article with a simple configuration.
  • FIG. 1 is an explanatory diagram showing an example of the glass plate according to this embodiment.
  • FIG. 2 is an explanatory diagram showing another example of the glass plate according to this embodiment.
  • FIG. 3 is an explanatory view showing the grindstone with shaft according to the present embodiment.
  • 4 is an enlarged view showing the vicinity of the grindstone of the mounted grindstone in FIG. 3.
  • FIG. 5 is an explanatory diagram showing how one surface of the glass plate is chamfered.
  • FIG. 6 is an explanatory diagram showing how the other surface of the glass plate is chamfered.
  • FIG. 7 is a cross-sectional view showing the vicinity of the chamfered portion of the glass plate.
  • FIG. 8 is an explanatory diagram showing a grindstone with shaft of a comparative example.
  • 9 is a cross-sectional view showing the vicinity of the chamfered portion by the mounted grindstone of FIG. 8.
  • FIG. 10 is an explanatory diagram showing an example of a mounted grindstone having a layered grindstone used in
  • the article to be chamfered is, for example, a glass plate.
  • a glass plate is, for example, a relatively thick glass used for a glass surface of a vehicle display or the like.
  • the thickness of the glass plate is preferably 0.2 mm or more, more preferably 0.8 mm or more, and even more preferably 1 mm or more.
  • the thickness of the glass plate is preferably 5 mm or less, more preferably 3 mm or less, and even more preferably 2 mm or less. If the thickness of the glass plate is within the above range, the final product will be strong enough to resist cracking.
  • the article is not limited to the glass plate, and any article that requires chamfering at the end may be used.
  • FIG. 1 is an explanatory diagram showing an example of the glass plate according to this embodiment.
  • FIG. 2 is explanatory drawing which shows the other example of the glass plate concerning this embodiment.
  • 1 and 2 are diagrams of the glass plates 1A and 1B viewed from a direction perpendicular to the thickness direction.
  • the thickness direction of the glass plates 1A and 1B is referred to as "direction Z”
  • one direction orthogonal to direction Z is referred to as "direction X”
  • direction Y the other direction orthogonal to direction Z
  • the glass plate 1A illustrated in FIG. 1 has an S shape when viewed from the direction Y perpendicular to the direction Z. That is, the glass plate 1A has a curved portion 2 that curves when viewed from the direction Y orthogonal to the direction Z. As shown in FIG.
  • the glass plate 1A may have at least one curved portion 2, or may have two or more curved portions 2.
  • the radius of curvature of the curved portion 2 is not particularly limited, it is preferably 50 mm or more, more preferably 100 mm or more, and more preferably 200 mm or more. On the other hand, it is preferable that the radius of curvature is, for example, 10000 mm or less.
  • the glass plate 1B illustrated in FIG. 2 extends in one direction in the direction Y orthogonal to the direction Z. That is, the thickness of the glass plate 1B changes in the direction Y at least at the chamfered edge.
  • the thickness of the glass plate 1B may vary at multiple locations.
  • the difference ⁇ t between the maximum thickness t2, which is the thickness of the thickest portion 11B of the glass plate 1B, and the minimum thickness t1, which is the thickness of the thinnest portion 12B, is, for example, 1% of the plate thickness of the glass plate. It may be 5% or more.
  • an article having a curved portion 2 such as the glass plate 1A, or an article having a chamfered end portion with a varying thickness such as the glass plate 1B has a complicated shape.
  • An example in which chamfering is performed on an article exhibiting is described.
  • a grindstone with a shaft is a grindstone that has a shaft portion and a processing surface that is attached to the end portion of the shaft portion and has a curved surface shape that is recessed toward the shaft center side with a predetermined curvature radius at the end portion. And prepare.
  • FIG. 3 is an explanatory diagram showing the grindstone with shaft according to this embodiment.
  • the mounted grindstone 10 according to this embodiment is a processing tool for chamfering the end of an article, and can be attached to a three-axis processing machine (not shown).
  • the chamfering of this embodiment is R chamfering that forms a so-called corner R at the end of the article.
  • the shafted grindstone 10 is not limited to a 3-axis processing machine, and may be attached to other processing devices such as a 4-axis processing machine or a 5-axis processing machine. Further, the processing of an article by the mounted grindstone 10 is not limited to attaching the mounted grindstone 10 to a three-axis machine and performing chamfering with the three-axis machine. may be used.
  • the shafted grindstone 10 has a shaft portion 20 and a grindstone 30, as shown in FIG.
  • the shaft portion 20 is a shaft-like member extending uniaxially.
  • the extending direction of the shaft portion 20 is the same as the axial center 10 a of the grindstone 10 with shaft.
  • the axial center of the shaft portion 20 is the axial center 10 a of the mounted grindstone 10 .
  • the extending direction of the shaft portion 20, that is, the extending direction (longitudinal direction) of the shafted grindstone 10 is referred to as the "axial direction”.
  • the shaft portion 20 is connected to, for example, a drive shaft of a three-axis machine (not shown) and rotates together with the drive shaft.
  • a grindstone 30 is attached to the end 20a of the shaft 20, and a three-axis machine (not shown), for example, can be connected to the opposite end.
  • a three-axis machine (not shown), for example, can be connected to the opposite end.
  • the total length L of the mounted grindstone 10 including the shaft portion 20, the maximum diameter D3 and the minimum diameter D4 of the shaft portion 20, and the like are determined by the distance from the drive shaft required for chamfering, the size of the grindstone 30, and the size of the shaft portion 20. It may be appropriately set according to the durability and the like.
  • the material of the shaft part 20 is not particularly limited, for example, carbon tool steel (SK material) can be used.
  • FIG. 4 is an enlarged view showing the vicinity of the grindstone of the mounted grindstone in FIG. 4 .
  • the grindstone 30 has a base metal (core) 32 , two working surfaces 34 and an abrasive grain layer 36 .
  • the working surface 34 is the surface on which the chamfering of the article is performed.
  • the base metal 32 of the whetstone 30 has a shape in which concave portions 321 are provided at both end portions of a cylindrical shape indicated by a chain double-dashed line in the figure.
  • the recess 321 is preferably formed axially symmetrically over the entire section of the end of the base metal 32 in the circumferential direction with the axial direction as the central axis.
  • At least one concave portion 321 is provided at the end of the base metal 32 , and is opposite to the base end 32 a and the shaft portion 20 at the end of the base metal 32 on the side of the shaft portion 20 . It is preferably formed on at least one of the distal end portion 32b, which is the side end, and more preferably formed on at least one of the base end portion 32a and the corner portion of the distal end portion 32b. Most preferably, one at each corner of 32b.
  • each recess 321 has the same shape, and is preferably formed at positions symmetrical with respect to the center O of the inscribed circle indicated by the dashed line of the base metal 32 in the axial direction.
  • Each recess 321 has a curved surface shape that is recessed toward the axis 10a with a predetermined curvature radius r1.
  • the outer peripheral surface of the base metal 32 in which each recess 321 is formed has an inverted spherical shape with a predetermined radius of curvature r1.
  • the grindstone 30 preferably has at least one recessed portion 321 at the end of the grindstone 30 based on, for example, a columnar shape, a spherical shape, or a polygonal columnar shape extending in the axial direction.
  • the outer peripheral surface of the base metal 32 on which the recesses 321 are formed serves as the processing surface 34 of the grindstone 30 . Therefore, the machined surface 34 becomes a surface having a curved surface shape recessed toward the axial center 10a side with a predetermined curvature radius r1. In other words, the machined surface 34 has an inverted spherical shape with a predetermined radius of curvature r1.
  • the predetermined curvature radius r1 of the processed surface 34 is preferably 5 mm or more and 35 mm or less. More preferably, the lower limit of the predetermined radius of curvature r1 is 7.5 mm or more. The upper limit of the curvature radius r1 is more preferably 20 mm or less, and even more preferably 10 mm or less.
  • the length L1 of the machined surface 34 in the axial direction and the length L2 of the radial direction orthogonal to the axial direction are determined according to the values of the maximum diameter D1, the minimum diameter D2 and the predetermined curvature radius r1 of the base metal 32. Determine automatically. As shown in FIG. 3, the maximum diameter D1 is the outer diameter of the base metal 32, and the minimum diameter D2 is the diameter of the end portion of the base metal 32 in the axial direction due to the recess 321 being formed.
  • the base metal 32 (grindstone 30) preferably has a maximum diameter D1 of 3 mm or more and 50 mm or less.
  • the maximum diameter D1 of the base metal 32 (grindstone 30) is more preferably 3 mm or more and 10 mm or less, and more preferably 3 mm or more and 5 mm or less.
  • the base metal 32 (grindstone 30) preferably has a minimum diameter D2 that is half or less of the maximum diameter D1. Moreover, it is preferable that the minimum diameter D2 of the base metal 32 (grindstone 30) is one-third or more of the maximum diameter D1.
  • the surface 4 which is the lower surface of the glass plate 1A, is supported by a pedestal. Since the amount of downward protrusion of the grindstone 30 is suppressed, it becomes easier to maintain the clearance between the grindstone 30 and the pedestal when chamfering the lower surface.
  • the abrasive grain layer 36 is preferably formed over the entire surface of the base metal 32 including the processing surface 34, as indicated by the thick solid line in FIG. Note that the abrasive layer 36 may be formed only on the processing surface 34 .
  • the abrasive grain layer 36 is preferably a diamond abrasive grain layer in which diamond abrasive grains are fixed to the processing surface 34 via a binder. That is, the mounted grindstone 10 according to the present embodiment is preferably a superabrasive wheel using diamond abrasive grains called superabrasive grains.
  • the diamond abrasive grains may be natural diamond, synthetic diamond, or metal-coated synthetic diamond.
  • the binder is, for example, an electrodeposition bond or a metal bond.
  • the electrodeposition may be electrolytic plating or electroless plating.
  • a bronze metal bond is used for the metal bond.
  • the metal bond may be cobalt-based or iron-based.
  • the binder may be a vitrified bond or a resinoid bond.
  • the Sa arithmetic mean height is 0.1 ⁇ m or more from the viewpoint of suppressing the deterioration of the reflected color of the chamfered portion of the glass plate after processing. is preferred.
  • the surface roughness of the processed surface 34 is preferably such that the Sa arithmetic mean height is 10 ⁇ m or less.
  • the Sa arithmetic mean height is more preferably 0.1 ⁇ m or more and 5 ⁇ m or less.
  • the Sa arithmetic mean height is a value measured based on ISO 25178-6:2010.
  • the Rz ten-point average roughness is preferably 0.1 ⁇ m or more and 30 ⁇ m or less, more preferably 0.1 ⁇ m or more and 10 ⁇ m or less, and more preferably 0.1 ⁇ m or more and 5 ⁇ m. More preferably: The Rz ten-point average roughness is a value specified in JIS B 0601:2013, Annex JA.
  • the abrasive grain layer 36 is not limited to the diamond abrasive grain layer.
  • it may be an abrasive grain layer using cubic boron nitride (CBN: Cubic Boron Nitride). It may be an abrasive layer of any kind.
  • FIG. 5 is an explanatory diagram showing how one surface of the glass plate is chamfered
  • FIG. 6 is an explanatory diagram showing how the other surface of the glass plate is chamfered.
  • processing surface 34 formed on the side opposite to the shaft portion 20 of the grindstone 30, that is, on the tip end side of the mounted grindstone 10 is appropriately referred to as "processing surface 34a", and the shaft portion 20 side of the grindstone 30 is called a “machined surface 34b”.
  • the shaft portion 20 of the shaft-mounted grindstone 10 may be connected to a three-axis processing machine (not shown). and Z-direction.
  • the operator executes a predetermined operation program for chamfering the edge of the glass plate 1A by the triaxial processing machine, thereby driving the triaxial processing machine and chamfering with the mounted grindstone 10. can be done.
  • the operator presses the processing surface 34a of the grindstone 30 against the surface 3 on one side of the edge of the glass plate 1A. Then, while rotating the shafted grindstone 10 at a predetermined number of revolutions, the operator moves the shafted grindstone 10 in the X direction, the Y direction, and the Z direction along the edge shape of the glass plate 1A at a predetermined feed rate. By doing so, the entire surface 3 of the glass plate 1A can be chamfered by the processed surface 34a.
  • the feed speed is the relative speed between the glass plate and the grindstone with shaft.
  • the feed rate is preferably 2900 mm/min or less, more preferably 2000 mm/min or less, still more preferably 1000 mm/min or less, and particularly preferably 900 mm/min or less. From the viewpoint of productivity, the feed rate is preferably 10 mm/min or more, for example.
  • the position P1 of the machined surface 34 at which the angle .theta. Chamfering is preferably performed at a portion A1 of the machined surface 34 located radially outside of the case of .
  • the operator presses the processing surface 34b of the grindstone 30 against the other end surface 4 of the glass plate 1A by, for example, driving a three-axis processing machine (not shown). Then, while rotating the shafted grindstone 10 at a predetermined number of revolutions, the operator moves the shafted grindstone 10 in the X direction, the Y direction, and the Z direction along the edge shape of the glass plate 1A at a predetermined feed rate. By doing so, the entire surface 4 of the glass plate 1A can be chamfered by the processed surface 34b. In this case as well, as shown in FIG.
  • the machined surface 34 located on the outer diameter side of the position P1 of the machined surface 34 at which the angle ⁇ between the tangent line 40 of the machined surface 34 and the axis becomes 45°. is preferably chamfered at the portion A1 of .
  • FIG. 7 is a cross-sectional view showing the vicinity of the chamfered portion of the glass plate.
  • FIG. 7 is a cross-sectional view in which a plane (cut plane) along the plate thickness direction of the glass plate 1A and passing through the sides (end surfaces) of the glass plate 1A is taken as a cross section (cut plane).
  • the chamfered portion 5 provided on the glass plate 1A is directed to the outside of the glass plate 1A (that is, away from the center Ax of the glass plate 1A) with a predetermined curvature radius r1a opposite to the processed surface 34. toward) becomes an arcuate surface having a convex shape. That is, the chamfered portion 5 has a chamfered shape in which the so-called corner R is rounded with a predetermined curvature radius r1a.
  • the glass plate 1A having chamfered ends is manufactured.
  • the radius of curvature r1a of the chamfered portion 5 matches the radius of curvature r1 of the grindstone 30, but may not match the radius of curvature r1 when the glass plate has a curved surface, for example.
  • the width B1 of the chamfered portion 5 is 0.05 mm or more and 1.0 mm or less.
  • the upper limit of the width B1 of the chamfered portion 5 is preferably 0.5 mm or less, more preferably 0.3 mm or less. It is preferable that the lower limit of the width B1 of the chamfered portion 5 is 0.1 mm or more.
  • the radius of curvature r1a of the chamfered portion 5 of the glass plate 1A is constant, but the radius of curvature of the chamfered portion 5 of the glass plate 1A is not limited to being constant, and the radius of curvature differs depending on the position. good too.
  • the radius of curvature of the chamfered portion 5 of the upper surface (surface 3) and the radius of curvature of the chamfered portion 5 of the lower surface (surface 4) of the glass plate 1A may be different.
  • the processing surface 34 of the grindstone 30 has a shape that allows the radius of curvature of the chamfered portion 5 of the glass plate 1A to vary from position to position, the radius of curvature of the grindstone 30 also differs from position to position. It will happen.
  • the shaft-mounted grindstone 10 includes the shaft portion 20 and the end portion of the shaft portion 20, and has a curved surface shape recessed toward the shaft center 10a side with a predetermined curvature radius r1. and a grindstone 30 having a processing surface 34 at its end.
  • the processing surface 34 of the grindstone 30 forms a chamfered portion formed on the article into an arcuate surface having a convex shape facing outward with a predetermined curvature radius r1, and the chamfered portion and other portions can be smoothly connected.
  • chipping occurring in the chamfered portion 5 of the article can be suppressed with a simple configuration using a 3-axis processing machine without using a 4-axis processing machine or a 5-axis processing machine, for example.
  • FIG. 8 is an explanatory view showing a wheeled grindstone of a comparative example
  • FIG. 9 is a cross-sectional view showing the vicinity of a chamfered portion by the wheeled grindstone of FIG.
  • a grindstone 50 with a shaft of the comparative example shown in FIG. 8 has a grindstone 60 with a spherical shape, as shown.
  • Other configurations of the shafted grindstone 50 are the same as those of the shafted grindstone 10 according to the present embodiment.
  • the chamfered portion 6 of the glass plate 1A has the same curvature radius r2 as the radius r2 of the grindstone 60, contrary to the grindstone 60. It becomes an arcuate surface having a curved surface shape recessed toward the inside.
  • the connecting portion between the chamfered portion 6 and the other portion of the glass plate 1A is a surface perpendicular to the chamfered portion 6 and the other portion (broken line ) becomes a relatively small value. That is, the edges 6a and 6b of the chamfered portion 6 are sharpened. As a result, the edges 6a and 6b of the chamfered portion 6 are likely to be chipped, and as a result, the strength of the chamfered portion 6 may be reduced.
  • the chamfered portion 5 according to the present embodiment shown in FIG. 7 is an arcuate surface having a convex shape toward the outside of the glass plate 1A. Therefore, at the connection portion between the chamfered portion 5 and the other portion of the glass plate 1A, the angle ⁇ formed by the chamfered portion 5 and the plane perpendicular to the other portion (see the broken line) is the angle in the chamfered portion 6 of the comparative example. larger than ⁇ .
  • edges 5a and 5b of the chamfered portion 5 are connected to other portions of the glass plate 1A more smoothly than the edges 6a and 6b of the chamfered portion 6 of the comparative example.
  • chipping can be suppressed at the edges 5a and 5b of the chamfered portion 5, and the strength of the chamfered portion 5 can be sufficiently secured.
  • the predetermined radius of curvature r1 is preferably 5 mm or more and 35 mm or less.
  • the size of the chamfered portion needs to be the size required for the article as a product.
  • the curvature radius of the chamfered portion is prevented from becoming too large to suppress the occurrence of chipping. is prevented from becoming too small, and a sufficient size of the chamfered portion required for the article as a product can be ensured.
  • the grindstone 30 has an abrasive grain layer 36 as a diamond abrasive grain layer formed on the processing surface 34 .
  • the chamfered portion can be processed with high accuracy, the efficiency of processing can be improved, and the frequency of replacement of the grindstone 30 can be reduced.
  • the abrasive grain layer 36 as a diamond abrasive grain layer preferably binds diamond abrasive grains by electrodeposition or metal bond, and the surface roughness of the processed surface 34 is Sa arithmetic mean height It is preferably 0.1 ⁇ m or more and 10 ⁇ m or less. With this configuration, the surface roughness of the machined surface 34 can be set to an appropriate value, and chipping occurring in the chamfered portion can be suppressed more satisfactorily.
  • the maximum diameter D1 of the grindstone 30 is 3 mm or more and 50 mm or less. This configuration allows the chamfering of articles of various sizes.
  • the angle between the tangent line 40 of the machining surface 34 and the axis is 45°.
  • the article is chamfered at portion A1 of working surface 34 on the radial side.
  • the portion A1 located on the outer diameter side of the position P1 is processed to come into contact with the end portion of the glass plate 1A compared to the portion A2 located closer to the axis 10a than the position P1.
  • the tangent angle of the surface 34 can be moderated. As a result, smooth grinding becomes possible and chipping occurring in the chamfered portion 5 can be suppressed more effectively than when the processed surface 34 abuts on the end portion of the glass plate 1A at a steep angle.
  • the grindstone 30 preferably has a minimum diameter D2 that is half or less of the maximum diameter D1.
  • the axial length L1 (see FIG. 3) of the machined surface 34 formed with the predetermined radius of curvature r1 can be sufficiently ensured.
  • the length of the portion A1 located on the outer diameter side of the position P1 at which the angle formed by the tangent 40 of the processing surface 34 and the axis is 45° is sufficiently secured, and the portion A1 is used to attach the article to the article. Can be chamfered.
  • the glass plate 1A manufactured by chamfering by the chamfering method according to the present embodiment is provided with a chamfered portion 5 having a convex shape facing outward with a predetermined curvature radius r1a at the end, Predetermined curvature radius r1a is 5 mm or more and 35 mm or less, width B1 of chamfered portion 5 is 0.05 mm or more and 1.0 mm or less, and at least one curved portion 2 curved when viewed from a direction perpendicular to the thickness direction is provided. .
  • a chamfered portion 5 having a convex shape facing outward with a predetermined curvature radius r1a at the end
  • Predetermined curvature radius r1a is 5 mm or more and 35 mm or less
  • width B1 of chamfered portion 5 is 0.05 mm or more and 1.0 mm or less
  • at least one curved portion 2 curved when viewed from a direction perpendicular to the thickness direction is provided.
  • the glass plate manufactured by chamfering by the chamfering method according to the present embodiment is provided with a chamfered portion 5 having a chamfered outward convex shape with a predetermined curvature radius r1a at the end portion.
  • the difference from the minimum thickness t1 may be 1% or more with respect to the plate thickness. That is, the glass plate 1B shown in FIG. 2 may be chamfered by the mounted grindstone 10.
  • chipping of the chamfered portion 5 can be suppressed and sufficient strength can be ensured.
  • the size of chipping on the surface of the chamfered portion of the glass plate manufactured by chamfering by the chamfering method according to the present embodiment is 50 ⁇ m or less. With this configuration, it is possible to sufficiently ensure the strength of the chamfered portion.
  • Table 1 shows the conditions and evaluation results of Examples 1 to 7.
  • chipping occurring in the chamfering portion was evaluated by varying the shape of the shafted grindstone for chamfering and the feed speed of the shafted grindstone.
  • a glass plate was used as an article to be chamfered.
  • Dragontrail registered trademark
  • the vertical length and horizontal length of the glass plate are the length in either the X direction or the Y direction shown in FIGS. 1 and 2 .
  • a51nx manufactured by Makino Milling Machine Co., Ltd. was used as a processing machine (chamfering device) for installing the mounted grindstone.
  • the upper and lower surfaces of the end portion of the glass plate were chamfered so that the width B1 of the chamfered portion was 0.2 mm.
  • the upper and lower surfaces of the glass plate correspond to surfaces 3 and 4 shown in FIGS.
  • Example 1 used the mounted grindstone 10 described in the above embodiment, that is, the one having the inverted spherical grindstone 30 .
  • the whetstone 30 is a diamond whetstone using # (number) 325 of A method in the JIS standard as diamond abrasive grains. Electrodeposition was used as a binder for the diamond abrasive grains.
  • the curvature radius r1 of the processing surface 34 of the grindstone 30 was set to 20 mm. Further, the maximum diameter D1 of the grindstone 30 (base metal 32) was 20 mm, and the minimum diameter D2 was 10 mm.
  • the shape of the glass plate as an article was set to a flat shape.
  • the glass plate was a flat glass plate that did not have a curved portion 2 as shown in FIG. 1 or a change in thickness as shown in FIG. Further, the rotation speed of the shafted grindstone 10 was set to 7500 rpm, and the feed rate of the shafted grindstone 10 was set to 500 (mm/min).
  • the term "inverted spherical shape" means a curved surface shape that is recessed toward the shaft center side of the grindstone with a predetermined radius of curvature.
  • Example 2 In Example 2, as the grindstone 10 with a shaft, one having a processing surface 34 with a radius of curvature r1 of 10 mm was used. In Example 2, the grindstone 30 (base metal 32) had a maximum diameter D1 of 10 mm and a minimum diameter D2 of 5 mm. Other conditions were the same as in Example 1. In Examples 2 to 7, the rotational speed of the mounted grindstone was adjusted so that the peripheral speed at the contact portion between the grindstone and the glass plate was the same as in the case of Example 1.
  • Example 3 In Example 3, as the grindstone 10 with a shaft, one having the processing surface 34 with a radius of curvature r1 of 30 mm was used. In Example 3, the grindstone 30 (base metal 32) had a maximum diameter D1 of 30 mm and a minimum diameter D2 of 15 mm. Other conditions were the same as in Example 1.
  • Example 4 In Example 4, the same mounted grindstone 10 as in Example 2 was used. Further, the feed speed of the grindstone 10 with shaft was set to 3000 mm/min. Other conditions were the same as in Example 1.
  • Example 6 is a comparative example.
  • a grindstone 50 with a shaft shown in FIG. 8, that is, a grindstone 60 having a spherical shape was used as a comparative example.
  • the radius r2 of the grindstone 60 that is, the value in the column of "curvature radius of machined surface” in Table 1 was set to 10 mm.
  • maximum diameter in Table 1 indicates the diameter of the grindstone 60.
  • the feed speed of the grindstone 50 with shaft was set to 500 mm/min. Other conditions were the same as in Example 1.
  • Example 7 is a comparative example.
  • Example 7 as a comparative example, a whetstone with a shaft having a layered whetstone shape was used.
  • FIG. 10 is an explanatory diagram showing an example of a mounted grindstone having a layered grindstone used in Example 7.
  • the mounted grindstone 70 has a layered grindstone 80 in which a layer of abrasive grains is provided on the side surface of a cylindrical grindstone.
  • the radius r3 of the grindstone 80 that is, the value in the column of "curvature radius of machined surface” in Table 1 was set to 10 mm.
  • “maximum diameter” in Table 1 indicates the diameter of the grindstone 80 having a cylindrical shape.
  • Other conditions were the same as in Example 1.
  • evaluation results As for the evaluation results, when the chipping evaluation (size of chipping) is 50 ⁇ m or less, the evaluation judgment is “excellent”, and when the chipping evaluation is greater than 50 ⁇ m and 60 ⁇ m or less, the evaluation judgment is “good”. When the evaluation was more than 60 ⁇ m and 70 ⁇ m or less, the evaluation was judged as “acceptable”, and when the chipping evaluation was more than 70 ⁇ m, the evaluation was judged as “impossible”. For chipping, the chamfered portion of the glass plate after chamfering was observed with a microscope, and the size of the largest chipping was measured. As a microscope, an Olympus laser microscope OLS5000 was used, and the magnification of the objective lens was set to 50 times.
  • Comparative Examples 6 and 7 had larger chipping than Examples 1 to 5, and were judged as "impossible".
  • the edge of the chamfered portion has a sharp shape. It was found that chipping can be reduced because it can be smoothly connected with
  • Example 4 in which the feed rate was set higher than in Example 2, although the chipping was slightly large at 60 ⁇ m, it was found that chipping could be sufficiently suppressed as compared with Examples 6 and 7.
  • Example 5 in which a glass plate having a curved portion was used, the magnitude of chipping could be made close to that in Example 1, in which the grindstone 30 having the same radius of curvature r1 was used. Therefore, it was found that the use of the mounted grindstone 10 can suppress the chipping of the chamfered portion of a glass plate having a complicated shape.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

La présente invention a pour objet de réaliser : une meule équipée d'un arbre qui peut, avec une configuration simple, supprimer un écaillage qui se produit au niveau d'une section chanfreinée d'un produit ; un procédé de chanfreinage ; un procédé de fabrication de plaque de verre ; et une plaque de verre. Cette meule équipée d'un arbre (10) comprend : un arbre (20) ; et une meule (30) qui est fixée à une extrémité de l'arbre (20), et qui présente à son extrémité une surface traitée (34) ayant une surface incurvée qui est en retrait, avec un rayon de courbure prescrit (r1), vers l'axe central (10a).
PCT/JP2022/012894 2021-03-26 2022-03-18 Meule équipée d'un arbre, procédé de chanfreinage, procédé de fabrication de plaque de verre, et plaque de verre WO2022202722A1 (fr)

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JP2023509155A JPWO2022202722A1 (fr) 2021-03-26 2022-03-18
CN202280023791.2A CN117042919A (zh) 2021-03-26 2022-03-18 带轴砂轮、倒角方法、玻璃板的制造方法以及玻璃板

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CN (1) CN117042919A (fr)
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03213273A (ja) * 1990-01-17 1991-09-18 Hitachi Ltd 再生可能な砥石、並びにその製造方法、および使用方法
JP2021037613A (ja) * 2019-08-29 2021-03-11 大和化成工業株式会社 表面加工部材

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03213273A (ja) * 1990-01-17 1991-09-18 Hitachi Ltd 再生可能な砥石、並びにその製造方法、および使用方法
JP2021037613A (ja) * 2019-08-29 2021-03-11 大和化成工業株式会社 表面加工部材

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JPWO2022202722A1 (fr) 2022-09-29
TW202237333A (zh) 2022-10-01

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