WO2019093341A1 - 屈曲基材の製造方法及び屈曲基材の成形型 - Google Patents

屈曲基材の製造方法及び屈曲基材の成形型 Download PDF

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Publication number
WO2019093341A1
WO2019093341A1 PCT/JP2018/041247 JP2018041247W WO2019093341A1 WO 2019093341 A1 WO2019093341 A1 WO 2019093341A1 JP 2018041247 W JP2018041247 W JP 2018041247W WO 2019093341 A1 WO2019093341 A1 WO 2019093341A1
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WIPO (PCT)
Prior art keywords
base material
preform
molding surface
substrate
molding
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Application number
PCT/JP2018/041247
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English (en)
French (fr)
Japanese (ja)
Inventor
弘輝 石橋
諭 金杉
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.)
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Publication date
Application filed by Ａｇｃ株式会社 filed Critical Ａｇｃ株式会社
Priority to JP2019552819A priority Critical patent/JP7196855B2/ja
Priority to CN201880072676.8A priority patent/CN111328322B/zh
Publication of WO2019093341A1 publication Critical patent/WO2019093341A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/025—Re-forming glass sheets by bending by gravity
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/035—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending

Definitions

  • the present invention relates to a method of manufacturing a flexible substrate and a mold for the flexible substrate.
  • An object of the present invention is to provide a method of manufacturing a flexible substrate that can be accurately positioned on a forming surface and easily form a high-quality flexible substrate, and a mold for the flexible substrate.
  • the present invention has the following constitution.
  • the preform substrate is placed on a forming die provided with a guide member having a guide portion which inclines from the outside of the forming surface toward the edge of the forming surface,
  • the peripheral edge portion of the preform base material is brought into contact with the guide portion and slipped to guide the peripheral edge portion of the preform base material toward the edge portion of the molding surface.
  • Method of producing a flexible substrate (2) A mold for forming a preform base material into a bent base material at least a part of which is curved along a molding surface of the mold, The molding surface having the same outer shape as the outer shape of the bent substrate; A guide member having a guide portion which inclines from the outside of the molding surface toward the edge of the molding surface; Equipped with The guide member guides the peripheral edge of the preform base toward the edge of the molding surface by bringing the peripheral edge of the preform base into contact with the guide and sliding it. Mold of flexible base material.
  • FIG. 1 is a perspective view of a bending base material 10 according to the present embodiment.
  • FIG. 2 is a plan view of the bending base material 10 according to the present embodiment.
  • FIG. 3 is a cross-sectional view of the edge portion of the bending base material 10 according to the present embodiment.
  • the bending base material 10 has one main surface 11 (lower surface in the drawing) and the other main surface 12 (upper surface which is the opposite surface of the main surface 11 in the drawing) Is a glass plate having
  • the bending substrate 10 is a substrate having a three-dimensional shape which is concavely curved downward along the X direction and the Y direction.
  • This bending base material 10 is used, for example, as a base material of a mirror of a head-up display or a cover glass of an on-vehicle product.
  • the corner 13 at the edge is chamfered in a convex curved shape.
  • the dimension a in the X direction, the dimension b in the Y direction, and the plate thickness t of the bending base material 10 are not particularly limited.
  • the plate thickness t is preferably substantially constant over the entire area of the flexible base 10. Further, the thickness t may be partially changed or may be changed over the entire area of the bending base material 10.
  • glass plates such as crystallized glass and color glass other than colorless and transparent amorphous glass, are mentioned.
  • the glass for example, alkali-free glass, soda lime glass, soda lime silicate glass, aluminosilicate glass, borosilicate glass, lithium aluminosilicate glass, borosilicate glass can be used. It is preferable to use an aluminosilicate glass from which a high stress can be easily obtained by a strengthening treatment even if the thickness is thin, even if the thickness is thin.
  • the glass composition 50 to 80% of SiO 2 , 0.1 to 25% of Al 2 O 3, and 3 to 10% of Li 2 O + Na 2 O + K 2 O are shown in the composition expressed in mol% based on oxide.
  • a glass containing 30%, 0-25% of MgO, 0-25% of CaO and 0-5% of ZrO 2 may be mentioned, but it is not particularly limited. More specifically, the following composition of glass is mentioned.
  • “containing 0 to 25% of MgO” means that MgO is not essential but may contain up to 25%.
  • the glass of (i) is contained in soda lime silicate glass, and the glass of (ii) and (iii) is contained in aluminosilicate glass.
  • the glass of (v) is contained in lithium aluminosilicate glass.
  • (I) 63 to 73% of SiO 2 , 0.1 to 5.2% of Al 2 O 3 , 10 to 16% of Na 2 O, and K 2 O in the composition expressed in mol% based on the oxide Glass containing 0 to 1.5%, 0 to 5% of Li 2 O, 5 to 13% of MgO and 4 to 10% of CaO.
  • Composition viewed in mole percent (ii) an oxide basis is, the SiO 2 50 ⁇ 74%, the Al 2 O 3 1 ⁇ 10% , a Na 2 O 6 ⁇ 14%, the K 2 O 3 ⁇ 11% , Containing 0 to 5% of Li 2 O, 2 to 15% of MgO, 0 to 6% of CaO and 0 to 5% of ZrO 2 , and the total content of SiO 2 and Al 2 O 3 is 75% or less Glass having a total content of Na 2 O and K 2 O of 12 to 25% and a total content of MgO and CaO of 7 to 15%.
  • the composition expressed in mol% based on oxide is 67 to 75% of SiO 2 , 0 to 4% of Al 2 O 3 , 7 to 15% of Na 2 O, and 1 to 9% of K 2 O , 0 to 5% of Li 2 O, 6 to 14% of MgO and 0 to 1.5% of ZrO 2 , the total content of SiO 2 and Al 2 O 3 is 71 to 75%, Na 2 O And a glass wherein the total content of K 2 O is 12 to 20%, and the content of CaO is less than 1%.
  • (V) the composition viewed in mole percent on the oxide basis, of SiO 2 56 - 73%, the Al 2 O 3 10 ⁇ 24% , the B 2 O 3 0 ⁇ 6% , P 2 O 5 0 to 6%, 2 to 7% of Li 2 O, 3 to 11% of Na 2 O, 0 to 2% of K 2 O, 0 to 8% of MgO, 0 to 2% of CaO, 0 to 5% of SrO Glass containing 0 to 5% of BaO, 0 to 5% of ZnO, 0 to 2 % of TiO 2 , and 0 to 4% of ZrO 2 .
  • the total content of Li 2 O and Na 2 O in the glass composition is preferably at least 12 mol%. Furthermore, since the content of Li 2 O in the glass composition becomes easy to the molded lower the glass transition temperature increases, the content of Li 2 O is preferably at least 0.5 mol%, more preferably at least 1 mol%, 2 mol% or more is more preferable. Furthermore, in order to increase the surface compressive stress (compressive stress; hereinafter, CS) and the surface compression stress layer (depth, layer: hereinafter, DOL), the glass composition contains 60 mol% or more of SiO 2 , Al It is preferable to contain 8 mol% or more of 2 O 3 .
  • CS surface compressive stress
  • DOL surface compression stress layer
  • a coloring agent in the range which does not inhibit achievement of a desired chemical-strengthening characteristic.
  • Co 3 O 4 , MnO, MnO which are metal oxides of Co, Mn, Fe, Ni, Cu, Cr, V, Bi, Se, Ti, Ce, Er, and Nd, which have absorption in the visible region.
  • the coloring component (Co, Mn, Fe, Ni, Cu, Cr, V, Bi, Se, Ti, Ce, Er, and Nd) is expressed in terms of mole percentage on an oxide basis in the glass. And at least one component selected from the group consisting of metal oxides of at least 7%. When the coloring component exceeds 7%, the glass tends to be devitrified.
  • the content is preferably 5% or less, more preferably 3% or less, and still more preferably 1% or less.
  • the glass plate may appropriately contain SO 3 , chloride, fluoride and the like as a fining agent at the time of melting.
  • preform base material 10P which is flat glass which can be used as a raw material of bending base material 10 is explained.
  • the raw materials of the respective components are prepared to have the above-described composition, and are heated and melted in a glass melting furnace.
  • the glass is homogenized by bubbling, stirring, addition of a clarifying agent, etc., and a glass plate of a predetermined thickness is produced by a known forming method and gradually cooled.
  • Examples of the method of producing the glass include a float method, a press method, a fusion method, a downdraw method and a roll out method.
  • the float method suitable for mass production is preferable.
  • continuous production methods other than the float method that is, the fusion method and the downdraw method are also suitable.
  • the glass plate produced in a flat plate shape by an arbitrary production method is cut into a desired size to obtain a flat glass.
  • the glass plate after cutting may be subjected to polishing / grinding, end face processing, or drilling. As a result, cracking and chipping can be reduced in handling in the heating step or the like, and the yield can be improved.
  • the bending base 10 may have a treatment layer.
  • the treatment layer is not particularly limited.
  • the treatment layer include an antiglare layer which scatters reflected light and provides an effect of reducing glare of reflected light due to reflection of a light source.
  • the treatment layer may be formed by processing the main surfaces 11 and 12 of the bending base 10 itself, or may be separately formed by a deposition treatment method.
  • a method of forming the treatment layer for example, at least a part of the flexible substrate 10 may be subjected to surface treatment by chemical treatment or physical treatment.
  • the antiglare layer a method of forming a concavo-convex shape having a desired surface roughness can be used.
  • the concavo-convex shape may be formed on at least a part of the bending base material 10 by a deposition treatment method of applying or spraying a treatment liquid, or a thermal treatment method such as molding.
  • a deposition treatment method of applying or spraying a treatment liquid or a thermal treatment method such as molding.
  • an antireflection layer (AR layer) or an anti-fingerprint wiping layer (AFP layer) may be formed as the processing layer.
  • the bending base material 10 is glass
  • molding 0.5 mm or more and 5 mm or less are preferable. If it is glass provided with the thickness more than this lower limit, bending base material 10 is obtained with high strength and good texture.
  • thickness t of glass 0.7 mm or more and 3 mm or less are more preferable, and 1 mm or more and 3 mm or less are still more preferable.
  • FIG. 4 is a perspective view of the bending base 10 and the preform base 10P.
  • FIG. 5 is a plan view of the bending base 10 and the preform base 10P.
  • the bending base material 10 is obtained by curving a flat preform base material 10P.
  • the preform base 10P is a flat glass plate obtained by inverse calculation from the shape of the bending base 10 which is a molded product. Specifically, the preform base material 10P is obtained by flattening the bending base material 10 with equal distribution load by simulation, and as shown in FIG. Is a flat glass plate having a large outer diameter.
  • FIG. 6 is a perspective view of a forming apparatus 20 for forming the preform base 10P on the flexible base 10.
  • FIG. 7 is a plan view of a forming apparatus 20 for forming the preform base 10P on the flexible base 10.
  • FIG. 8 is a perspective view of the molding device 20 and the guide member 50. As shown in FIG.
  • the molding device 20 includes a molding die 30 and a guide member 50.
  • the forming apparatus 20 is an apparatus for forming a flat preform substrate 10P, which is a material of the flexible substrate 10, into a curved substrate 10 by curving.
  • the mold 30 has a molding surface 31 on the upper surface thereof, and a guide member 50 is provided around the molding surface 31.
  • the molding surface 31 is formed in a three-dimensional shape which is concavely curved downward along the Y direction and the X direction.
  • the molding surface 31 is a molding surface for molding the preform substrate 10P into the shape of the bending substrate 10 by bringing one main surface 11 of the preform substrate 10P, which is a material of the bending substrate 10, into close contact.
  • the guide member 50 is a member for guiding and positioning the preform base 10P to the molding surface 31.
  • the preform base 10P is placed on the molding die 30 having the molding surface 31 from above the molding surface 31.
  • the preform base 10P placed on the forming die 30 is guided by the guide member 50 and positioned on the forming surface 31.
  • the plurality of guide members 50 have both sides in the longitudinal direction (Y direction) of the preform base 10P, and the preform base 10P. Are respectively disposed on both sides in the short direction (X direction) of.
  • the molding surface 31 has a plurality of suction holes 32 formed therein.
  • a suction hose (not shown) from a vacuum pump (not shown) is connected to these suction holes 32 and can be suctioned by the vacuum pump.
  • the molding die 30 has a plurality of fitting recesses 33 formed around the molding surface 31 on the upper surface thereof, and the guide members 50 are fitted and mounted in the fitting recesses 33. Thus, a plurality of guide members 50 are erected on the periphery of the molding surface 31 in the molding die 30 at intervals.
  • the material of the mold 30 is preferably an oxidation resistant metal such as stainless steel, a glass such as fused silica glass, a ceramic, carbon, and more preferably a glass such as fused silica glass and carbon.
  • Fused silica has high resistance to high temperature in an oxidizing atmosphere, and it is difficult to form a defect on the preform substrate 10P in contact with the molding surface 31, and a bent substrate 10 with few scratches is obtained.
  • Carbon has high thermal conductivity and can efficiently produce the bent substrate 10.
  • a film of metal, oxide, carbon or the like may be formed on the molding surface 31 of the molding die 30.
  • the guide member 50 is formed in a pin shape, and has a straight portion 51 and an inclined portion 52.
  • the straight portion 51 is formed in a cylindrical shape
  • the inclined portion 52 is formed in a conical shape.
  • the guide member 50 has a shape in which the inclined portion 52 has a cross-sectional area gradually increasing downward.
  • the guide member 50 is erected around the molding surface 31 of the molding die 30 by fitting the straight portion 51 into the fitting recess 33 of the molding die 30.
  • the upper end portion of the straight portion 51 slightly protrudes from the upper surface of the mold 30 while the guide member 50 is fitted in the fitting recess 33.
  • the projecting dimension of the straight portion 51 from the upper surface of the mold 30 is preferably 0 mm or more at a position closest to the molding surface 31 and is preferably the same dimension or less as the thickness t of the preform substrate 10P.
  • the guide member 50 has a linear guide portion 53 on the forming surface 31 side of the inclined portion 52 in a state where the straight portion 51 is fitted in the fitting recess 33 of the forming die 30 and mounted on the forming die 30.
  • the guide portion 53 is inclined from the outside of the molding surface 31 toward the edge of the molding surface 31, and the peripheral portion of the preform base 10P is point-contacted with the guide portion 53.
  • the guide portion 53 of the guide member 50 has a coefficient of static friction at a forming temperature when forming the preform base 10P into the bending base 10 to be 0.5 or less.
  • a temperature at which the equilibrium viscosity of the preform base material 10P becomes 10 17 Pa ⁇ s or less is preferable to be higher than the glass transition temperature or lower.
  • 500 ° C. to 700 ° C. are preferable.
  • 0.5 or less is preferable and, as for the static friction coefficient of the guide part 53, 0.3 or less is more preferable. This is to suppress local deformation of the preform base material 10P due to contact resistance with the guide portion 53.
  • the lower limit of the coefficient of static friction of the guide portion 53 is not particularly limited, but is preferably 0.01 or more, and more preferably 0.05 or more. This is to prevent extreme displacement of the position of the preform base 10P at the time of initial installation of the preform base 10P.
  • the static friction coefficient can be measured by the method described in JIS K 7125.
  • the guide portion 53 has a surface roughness of 50 nm to 1000 nm.
  • 1000 nm or less is preferable and, as for surface roughness Ra of the guide part 53, 500 nm or less is more preferable. This is because the contact surface with the preform substrate 10P maintains a certain level of surface strength.
  • 50 nm or more is preferable and, as for surface roughness Ra of the guide part 53, 100 nm or more is more preferable. This is to reduce the true contact surface with the preform substrate 10P to reduce the resistance due to friction and to prevent the local deformation of the preform substrate 10P.
  • the guide portion 53 has an inclination angle of 45 ° to 89 ° with respect to the bottom surface of the straight portion 51.
  • 89 degrees or less are preferable and, as for the inclination angle of the guide part 53, 80 degrees or less are more preferable. This is to reduce the vertical stress between the preform base 10P and the guide portion 53 at the time of molding to reduce the frictional force and to suppress the local deformation of the preform base 10P.
  • 45 degrees or more are preferable and, as for the inclination of the guide part 53, 50 degrees or more are more preferable. This is to prevent the preform base material 10P from being locally deformed while finally riding on the guide portion 53.
  • the material of the guide member 50 is preferably an oxidation resistant metal such as stainless steel, a glass such as fused silica glass, a ceramic, or carbon. Moreover, it is preferable that the low friction material is coated on the guide part 53 which the guide member 50 contacts the peripheral part of the preform base material 10P at least. As a coating of this low friction material, tungsten disulfide (WS 2 ), molybdenum disulfide (MoS 2 ), boron nitride (BN) or the like is preferable. As the guide member 50, for example, a coating such as carbon may be formed on the outer peripheral surface, or may be formed of a single carbon. Alternatively, the edge of the glass may be coated.
  • the low friction material As the coating of the low friction material, tungsten disulfide (WS 2 ), molybdenum disulfide (MoS 2 ), boron nitride (BN), carbon (C) or the like is preferable. Then, the low friction material is coated at least on the guide portion 53, the glass edge portion, or the material of the guide member 50 itself is selected, whereby the guide portion 53 has a desired coefficient of static friction.
  • the forming die 30 of the forming apparatus 20 for forming the flexible substrate 10 is moved as one cycle inside a heating furnace (not shown) having an in / out zone, a heating zone, and a slow cooling zone. And the shaping
  • FIG. 9 is a view for explaining a method of forming the flexible base 10 using the forming apparatus 20, and FIGS. 9A to 9C are perspective views of the forming apparatus 20 in the forming process.
  • FIG. 10 is a plan view of a part of the forming apparatus 20 for explaining the variation and the positioning of the outer shape of the preform base 10P by the forming.
  • a preform substrate 10P having an outer shape obtained by flattening the bending substrate 10 with a uniform distribution load by simulation is prepared (see FIGS. 4 and 5).
  • the preform base material 10P is set in the molding apparatus 20. Specifically, the preform base 10P is placed on the inside of the plurality of guide members 50 from above the forming die 30 of the forming apparatus 20 by a transfer mechanism (not shown). At this time, the flat preform base 10P has a larger outer shape in plan view than the molding surface 31 having the same outer shape in plan view as the bending base 10. For this reason, as shown in FIG. 10, the peripheral portion of the preform base material 10P protrudes from the molding surface 31, and contacts the guide portion 53 of the inclined portion 52 of the guide member 50 erected around the molding surface 31. And locked (see dotted line in FIG.
  • the preform base material 10P is supported at its peripheral edge portion by the inclined portion 52 of the guide member 50, and is disposed at a position spaced upward with respect to the molding surface 31.
  • the mold 30 is heated to about 400 ° C. in a heating furnace.
  • Molding process The mold 30 moves to the heating zone of the furnace. Thereby, preform base material 10P is heated to molding temperature.
  • the preform base 10P is softened by being heated to the molding temperature. Then, since the peripheral portion of the preform base 10P is in contact with the guide portion 53 of the guide member 50, the central portion of the preform base 10P hangs down by its own weight. As a result, the outer shape of the preform base material 10P gradually decreases in plan view, and the peripheral edge in contact with the guide portion 53 slides down by its own weight while contacting the guide portion 53. Thereby, as shown in FIG. 9C, the preform base material 10P is guided to the molding surface 31 by the guide portion 53, and as shown in FIG. 10, is molded while being aligned with the molding surface 31.
  • preform base material 10P It is disposed so as to be suspended by its own weight on the molding surface 31 of the mold 30 (see a solid line in FIG. 10).
  • the preform substrate 10P has the center of gravity side or the lower side of the inclination first. Sliding down, the edge of one end contacts the straight portion 51 of the guide member 50.
  • the center part of the preform base material 10P approaches the molding surface 31 with the contact point with the straight portion 51 as a base point.
  • the edge other than the end slides down while contacting the guide portion 53, and is aligned with the molding surface 31 and disposed on the molding surface 31.
  • the slip property may be improved by applying vibration to the guide member 50.
  • the vacuum pump is driven in a state where the preform substrate 10P is disposed on the molding surface 31 of the molding die 30, and the suction hole 32 formed in the molding surface 31 allows the space between the molding surface 31 and the preform substrate 10P. Air is aspirated. Thereby, the preform base material 10P is brought into close contact with the molding surface 31 in a state of being positioned on the molding surface 31 with high accuracy, and the curved surface shape of the molding surface 31 is transferred to be the bent substrate 10 of a desired curved shape. Ru.
  • the preform base material 10P may not only provide a curved surface shape by suction with a vacuum pump, but may press at least a part of the top surface of the preform base material 10P from the top surface, or may combine these.
  • the coefficient of static friction of the guide portion 53 of the molding die 30 is 0.1, and the molding temperature is 630 ° C.
  • FIGS. 11A to 11F are schematic perspective views of the molding apparatus 20 in the molding process
  • FIGS. 12A to 12F are schematic side views of the molding apparatus 20 in the molding process
  • FIGS. 13 (a) to 13 (f) are schematic plan views of the forming apparatus 20 in the forming process.
  • the preform base 10P When the preform base 10P is heated to the molding temperature (630 ° C.) from the state where the preform base 10P is set in the molding die 30 (see FIGS. 11 (a), 12 (a) and 13 (a))
  • the preform base material 10P whose peripheral edge portion is supported by the guide portion 53 is slightly bent at its center by its own weight about 1 second after setting, and the outer shape in a plan view becomes slightly smaller.
  • the preform base material 10P slips down first on the center of gravity side, and the edge of one end contacts the straight portion 51 of the guide member 50 (FIG. 11 (b), FIG. 12 (b) and FIG. b) see).
  • the preform base material 10P is further softened to increase the deflection due to its own weight, and the central portion thereof approaches the molding surface 31 (FIG. 11 (c), FIG. 12 (c) and FIG. 13). (See (c)), the edges other than one end slide down while contacting the guide portion 53.
  • the preform substrate 10P is positioned on the molding surface 31, and the peripheral edge portion contacts the straight portion 51 of the guide member 50, and the outer peripheral side of the main surface 11 contacts the molding surface 31 ( 11 (d), 12 (d) and 13 (d)).
  • the preform substrate 10P After about 110 seconds from the set time, the preform substrate 10P has a slight gap in the central portion with respect to the molding surface 31, and the other portions except the central portion are in close contact (FIG. 11 (e)) 12 (e) and 13 (e)).
  • a high quality bending base material at least a part of which is curved by hanging down the preform base material 10P along the molding surface 31. 10 can be easily molded. Moreover, when forming the preform base material 10P into the bending base material 10 by its own weight, the peripheral portion of the preform base material 10P is guided toward the periphery of the molding surface 31 by the guide portion 53 of the guide member 50. The preform base 10P can be accurately positioned on the molding surface 31 having the same outer shape as the outer shape of the base 10. As a result, it is possible to eliminate the need for complicated post-processing of grinding after molding to finish the outer shape into the final outer shape.
  • the preform base material 10P can be positioned with high accuracy to the molding surface 31 of the molding die 30, and the high quality bent base material 10 can be easily molded.
  • the molding surface 31 having the same outer shape as the outer shape of the bending base material 10
  • the outer shape of the bending base material 10 and the outer shape of the molding surface 31 do not have to be completely identical, and at least a part thereof may be matched. It is preferable to match 50% or more, and more preferably 70% or more.
  • the peripheral edge portion of the preform base material 10P which is suspended by its own weight by the guide portion 53 of the guide member 50 provided at the opposing position across the molding surface 31 in the direction of bending the preform base material 10P.
  • the preform base 10P can be positioned on the molding surface 31 with high accuracy.
  • the slip of the peripheral portion of the preform base 10P with respect to the guide portion 53 of the guide member 50 is good. it can. Thereby, the peripheral edge portion of the preform base material 10P is smoothly guided to the edge portion of the molding surface 31 by the guide portion 53.
  • the preform substrate 10P into an outer shape when the bending substrate 10 is made flat, when the preform substrate 10P is formed into the bending substrate 10, the formed bending is performed.
  • the substrate 10 can be precisely shaped to the target.
  • the preform substrate 10P is firmly adhered to the molding surface 31 by the adsorption process.
  • the molding accuracy can be further enhanced to improve the quality.
  • a part of the peripheral portion of the preform base 10P is engaged with the straight portion 51 of the guide member 50.
  • the preform base material 10P hangs down obliquely due to the deviation of the center of gravity or the inclination at the time of mounting, the lower edge is locked to the straight portion 51, and then the other portion of the peripheral edge is It is guided by the guide portion 53 of the guide member 50 and positioned on the molding surface.
  • the preform base 10P can be reliably positioned on the molding surface 31.
  • peripheral edge portion of the preform base material 10P is accurately guided to the edge portion of the molding surface 31 while being in point contact with the linear guide portion 53 of the guide member 50 formed in a pin shape.
  • a peripheral part is ground
  • it can be used as various base materials, such as a mirror of a head-up display, and a cover glass of vehicle-mounted goods, without chamfering.
  • FIG. 14 is a perspective view of a molding apparatus 20 used in another embodiment.
  • FIG. 15 is a plan view of a molding apparatus 20 used in another embodiment.
  • FIG. 16 is a perspective view of the molding device 20 and the guide member 70. As shown in FIG.
  • a bending base 10 is formed using a mold 30 having a pair of guide members 70 formed in a block shape together with a guide member 50 formed in a pin shape. Molding.
  • the guide members 70 are disposed at mutually opposing positions.
  • the guide member 70 also has a straight portion 71 and a sloped portion 72, and the sloped portion 72 has a shape in which the cross-sectional area gradually increases toward the lower side.
  • the molding surface 31 side of the inclined part 72 is planar
  • the guide portion 73 of the The peripheral edge portion of the preform base 10P is in contact with the guide portion 73 of the guide member 70.
  • the guide portion 73 is inclined from the outside of the molding surface 31 toward the edge of the molding surface 31.
  • the guide portion 73 is formed in a wide shape, whereby the peripheral portion of the preform base 10P is in line contact with the guide portion 73.
  • FIG. 17 is a view for explaining the method for forming the flexible base 10 using the forming apparatus 20, and FIGS. 17 (a) to 17 (c) are perspective views of the forming apparatus 20 in the forming process.
  • a preform base 10P obtained by flattening the bending base 10 with uniform distribution load by simulation is prepared (see FIGS. 4 and 5).
  • the preform base 10P is set to the forming die 30 of the forming apparatus 20 by the transport mechanism. Specifically, the preform base 10P is placed on the inside of the plurality of guide members 50 and 70 erected on the forming die 30 from above the forming surface 31 of the forming die 30. At this time, the flat preform base 10P having a large outer shape in a plan view with respect to the bending base 10 has inclined portions 52 and 72 of the guide members 50 and 70 whose peripheral edge portion is erected around the molding surface 31. Is abutted against the guide portions 53 and 73 of the
  • the mold 30 is moved to the heating zone of the furnace, and the preform substrate 10P is heated to the molding temperature.
  • the preform base material 10P is softened by being heated to the molding temperature, as shown in FIG. 17B, the peripheral edge portion is in contact with the guide portions 53 and 73 of the guide members 50 and 70, The central part hangs down by its own weight.
  • the outer shape of the preform base material 10P gradually decreases in plan view, and the peripheral edge in contact with the guide portions 53 and 73 slides down by its own weight while contacting the guide portions 53 and 73.
  • the preform base material 10P is guided to the molding surface 31 by the guide portions 53 and 73, thereby being aligned with the molding surface 31, and the molding surface of the molding die 30 It is placed by hanging down on its own weight.
  • the guide member 70 is formed in a wide shape, the preform base material 10P slides down while the edges of the both ends thereof are in line contact with the guide portion 73 formed by the surface of the guide member 70.
  • the preform substrate 10P has the center of gravity side or the lower side of the inclination first. Sliding down, the edge of one end contacts the straight portion 71 of the guide member 70. Then, when the deflection due to its own weight increases due to the subsequent softening of the preform base material 10P, the center part of the preform base material 10P approaches the molding surface 31 starting from the contact point with the straight part 71 and other than one end. The edge of the slider slides down while in contact with the guide portions 53 and 73, and is positioned on the molding surface 31 in alignment with the molding surface 31.
  • the vacuum pump is driven in a state where the preform substrate 10P is disposed on the molding surface 31 of the molding die 30, and the suction hole 32 formed in the molding surface 31 allows the space between the molding surface 31 and the preform substrate 10P. Air is aspirated. Thereby, the preform base material 10P is brought into close contact with the molding surface 31 in a state of being positioned on the molding surface 31 with high accuracy, and the curved surface shape of the molding surface 31 is transferred to be the bent substrate 10 of a desired curved shape. Ru.
  • the peripheral portion of the preform base material 10P is formed on the molding surface 31 by the guide portions 53, 73 of the guide members 50, 70.
  • the preform base 10P can be accurately positioned on the molding surface 31 having the same outer shape as the outer shape of the bending base 10. As a result, it is possible to eliminate the need for complicated post-processing of grinding after molding to finish the outer shape into the final outer shape.
  • the preform substrate 10P can be positioned with high accuracy to the molding surface 31 of the mold 30, and the high-quality bent substrate 10 can be easily molded.
  • the molding die 30 accurately guides the edge portion of the preform base 10P to the edge portion of the molding surface 31 while making line contact with the planar guide portion 73 of the guide member 70 formed in a block shape.
  • the bending base 10 of the curved shape is molded by the molding surface 31 recessed downward is illustrated, the bending base 10 of the curved shape is molded by the molding surface 31 which bulges upward.
  • the base material 10 may be formed so as to be unevenly curved on the front and back sides by the forming surface 31 which is curved up and down.
  • the guide portions 53, 73 of the inclined portions 52, 72 of the guide members 50, 70 may have a gentle shape for guiding the peripheral portion of the preform base material 10P to the edge of the molding surface 31. Not exclusively.
  • the guide portions 53 and 73 may have, for example, a curved shape that gently dents, or may have a curved shape that bulges gently.
  • a conical pin-shaped guide member 50 or Not limited to the wide block-shaped guide member 70, for example, a triangular pyramid or the like may be used.
  • the mold 30 may be provided with the guide member 50 or the guide member 70 only on the end side in the direction of bending (Y direction).
  • boards such as not only a glass plate but ceramics, resin, a wood, a metal, etc. may be sufficient.
  • a plurality of guide members may have the same shape as in the embodiment shown in FIG. 6, and as in the other embodiment shown in FIG. May have different shapes.
  • the preform substrate may be brought into contact with all of the plurality of guide members when it is set in the molding apparatus.
  • the preform substrate is brought into contact with a portion of the plurality of guide members when set in the molding apparatus, and the number of the plurality of guide members brought into contact is increased when the preform substrate hangs down. May be
  • a manufacturing method for forming a preform substrate into a bent substrate at least a part of which is curved along a molding surface of a mold In the vertical direction at an arbitrary point of the molding surface, assuming that the direction in which the preform base material curves during molding is downward, the opposite direction is upward, and the top surface view is the outside other than the molding surface, A substrate placing step of placing the preform substrate from above the molding surface having the same outer shape as the outer shape of the bent substrate; And forming the preform substrate along the molding surface by its own weight by heating and softening the preform substrate.
  • the preform substrate is placed on a forming die provided with a guide member having a guide portion which inclines from the outside of the forming surface toward the edge of the forming surface,
  • the peripheral edge portion of the preform base material is brought into contact with the guide portion and slipped to guide the peripheral edge portion of the preform base material toward the edge portion of the molding surface.
  • the peripheral portion of the preform base material is guided toward the periphery of the forming surface by the guide portion of the guide member, and therefore the same as the outer shape of the bending base material
  • the preform substrate can be accurately positioned on the molding surface having the outer shape.
  • the said manufacturing method can position a preform base material with high precision to the molding surface of a shaping
  • an adsorption step of suctioning the preform base material onto the molding surface by suction from suction holes provided in the molding surface is performed.
  • flexion base material as described in any one of (1) to (5). According to the manufacturing method of this bending base material, a preform base material is certainly stuck on a molding surface by an adsorption process. As a result, the molding accuracy can be further enhanced to improve the quality.
  • a pin-shaped guide member whose cross-sectional area increases downward is provided in the mold, and the peripheral edge of the preform base material is formed on the guide portion formed in a linear shape of the guide member.
  • flexion base material as described in any one of (1) to (7) which makes a part point contact. According to the manufacturing method of this bending base material, the peripheral edge portion of the preform base material is accurately guided to the edge portion of the forming surface while making point contact with the linear guide portion of the guide member formed in a pin shape.
  • the molding surface having the same outer shape as the outer shape of the bent substrate;
  • a guide member having a guide portion which inclines from the outside of the molding surface toward the edge of the molding surface; Equipped with The guide member guides the peripheral edge of the preform base toward the edge of the molding surface by bringing the peripheral edge of the preform base into contact with the guide and sliding it.
  • Mold of flexible base material According to the mold of the bending base, by hanging the preform base along the molding surface, it is possible to easily form a high quality bending base at least a part of which is curved.
  • the peripheral portion of the preform base material is guided toward the periphery of the forming surface by the guide portion of the guide member, and therefore the same as the outer shape of the bending base material
  • the preform substrate can be accurately positioned on the molding surface having the outer shape.
  • the mold can position the preform base on the molding surface of the mold with high accuracy, and can easily mold a high-quality bent base.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
PCT/JP2018/041247 2017-11-10 2018-11-06 屈曲基材の製造方法及び屈曲基材の成形型 WO2019093341A1 (ja)

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CN201880072676.8A CN111328322B (zh) 2017-11-10 2018-11-06 弯曲基材的制造方法和弯曲基材的成型模具

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JPH08501272A (ja) * 1993-07-09 1996-02-13 サン−ゴバン ビトラージュ ガラス板を成形するための方法と装置、及び複雑な形状のガラスの製造へのそれらの使用
JPH11263634A (ja) * 1998-01-16 1999-09-28 Asahi Glass Co Ltd ガラス板プレス用支持リングおよびこれを用いたガラス板の曲げ成形装置
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GB674495A (en) * 1949-07-30 1952-06-25 Libbey Owens Ford Glass Co Shaping glass sheets
US2840953A (en) * 1951-12-14 1958-07-01 Pittsburgh Plate Glass Co Guide for glass bending molds
JPH0226845A (ja) * 1988-07-12 1990-01-29 Nippon Sheet Glass Co Ltd 曲げガラス製造装置
JPH06219759A (ja) * 1993-01-28 1994-08-09 Central Glass Co Ltd 曲面ガラスおよびその製法
JPH08501272A (ja) * 1993-07-09 1996-02-13 サン−ゴバン ビトラージュ ガラス板を成形するための方法と装置、及び複雑な形状のガラスの製造へのそれらの使用
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CN111328322B (zh) 2022-06-24

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