WO2014199702A1 - Procédé pour la fabrication d'article en verre moulé et dispositif pour la fabrication d'article en verre moulé - Google Patents

Procédé pour la fabrication d'article en verre moulé et dispositif pour la fabrication d'article en verre moulé Download PDF

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Publication number
WO2014199702A1
WO2014199702A1 PCT/JP2014/059409 JP2014059409W WO2014199702A1 WO 2014199702 A1 WO2014199702 A1 WO 2014199702A1 JP 2014059409 W JP2014059409 W JP 2014059409W WO 2014199702 A1 WO2014199702 A1 WO 2014199702A1
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WIPO (PCT)
Prior art keywords
mold
molding
molding surface
molten glass
glass
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PCT/JP2014/059409
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English (en)
Japanese (ja)
Inventor
将也 木下
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コニカミノルタ株式会社
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Publication of WO2014199702A1 publication Critical patent/WO2014199702A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/10—Construction of plunger or mould for making hollow or semi-hollow articles
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/05—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing in machines with reciprocating moulds
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/70—Horizontal or inclined press axis
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/76—Pressing whereby some glass overflows unrestrained beyond the press mould in a direction perpendicular to the press axis

Definitions

  • the present invention relates to a method for producing a glass molded article, and in particular, production of a glass molded article for producing a glass molded article including a main plate portion and a side plate portion continuously provided from at least a part of an outer edge of the main plate portion by pressure molding.
  • the present invention relates to a method and a manufacturing apparatus.
  • cover glasses provided in display devices such as smartphones and tablet terminals are widely used.
  • the cover glass is a portion that appears exposed on the outer surface of a display device or the like, and requires excellent design.
  • a cover glass having excellent design properties a cover glass having a complicated three-dimensional shape such as a substantially box shape composed of a main plate portion and a side plate portion connected to the outer edge thereof is required.
  • the logo mark and icon mark can be formed by grinding the main surface of a glass blank as a glass molded product.
  • the glass blanks that have been pressed may be polished or ground to obtain the required surface accuracy, so if further grinding is performed to obtain a logo mark or icon mark, it will be manufactured. This complicates the process and leads to an increase in manufacturing cost. In particular, when a local convex shape is cut out, the grinding time is increased and the manufacturing cost is greatly increased.
  • the method for manufacturing a glass molded product disclosed in Patent Document 1 includes a step of horizontally disposing a pair of molds, a step of dropping a molten glass lump between a pair of opposed molds, and dropping the molten glass lump. And a step of pressing and molding the molten glass lump in a horizontal direction using a pair of molds.
  • a glass molded product By producing a glass molded product through such a process, a glass molded product having a good surface accuracy of a mirror surface or a state close thereto is obtained, and the surface of the glass molded product after pressure molding is subjected to polishing treatment. At least the surface of the glass molded product can be used as it is as the product surface of the final product.
  • the second cavity portion for forming the side plate portion from the first cavity portion for forming the main plate portion.
  • the molten glass is filled in the first cavity portion and the second cavity portion by spreading the molten glass toward the surface.
  • the second cavity portion extends in a direction intersecting the first cavity portion, when the molten glass moves to the second cavity portion by changing the moving direction, friction with the mold is caused.
  • the moving speed decreases.
  • fever of a molten glass becomes easy to be taken by a metal mold
  • the cover glass provided therein is also required to be thinned.
  • the second cavity portion is partially cured.
  • the molten glass is broken or the transferability and releasability are impaired, resulting in a problem that the yield is greatly reduced or the production itself cannot be performed.
  • This invention is made
  • a manufacturing method of a glass molded product according to the present invention is a manufacturing method for manufacturing a glass molded product including a main plate portion and a side plate portion continuously provided from at least a part of an outer edge of the main plate portion, The step of disposing the first mold and the second mold for pressure forming opposite to each other, and bringing the first mold and the second mold close to each other, thereby allowing the molten glass to move from the first mold to the first mold. And a step of pressing and molding by using a second mold.
  • the first mold includes a first molding surface for molding the outer surface of the main plate portion and a second molding surface for molding the outer surface of the side plate portion.
  • the second mold includes a third molding surface for molding the inner surface of the main plate portion and a fourth molding surface for molding the inner surface of the side plate portion.
  • the molten glass spread by the first molding surface and the third molding surface in the pressure molding step is the second molding surface.
  • the fourth molding surface are filled, at least a part of the spread molten glass stays in the vicinity of the boundary between the first molding surface and the second molding surface.
  • a mold having a recess provided in at least a part near the boundary is used as the first mold.
  • An apparatus for producing a glass molded product according to the present invention is a device for producing a glass molded product including a main plate portion and a side plate portion continuously provided from at least a part of an outer edge of the main plate portion.
  • the first mold includes a first molding surface for molding the outer surface of the main plate portion and a second molding surface for molding the outer surface of the side plate portion.
  • the second mold includes a third molding surface for molding the inner surface of the main plate portion and a fourth molding surface for molding the inner surface of the side plate portion.
  • the first mold and the second mold are relatively moved by the drive mechanism, whereby the first molding surface and the third mold are moved.
  • the molten glass spread by the molding surface is filled between the second molding surface and the fourth molding surface, at least a part of the spread molten glass is in contact with the first molding surface.
  • a recess is provided in at least a part of the first mold in the vicinity of the boundary so as to stay in the vicinity of the boundary with the second molding surface.
  • the present invention it is possible to provide a glass molded product manufacturing method and a glass molded product manufacturing apparatus that can be molded into a complicated three-dimensional shape having a main plate portion and a side plate portion and can be thinned.
  • FIG. 2 is a schematic cross-sectional view taken along line II-II of the display device shown in FIG. It is the schematic which shows the structure of the manufacturing apparatus of the glass molded product which concerns on embodiment of this invention. It is a schematic cross section of the 1st metal mold
  • FIG. 1 is a perspective view showing a state in which a display device including a cover glass manufactured according to a method for manufacturing a glass molded product according to an embodiment of the present invention is partially disassembled.
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG. With reference to FIG. 1 and FIG. 2, the cover glass 10 manufactured according to the manufacturing method of the glass molded product which concerns on this Embodiment, and the display apparatus 100 which comprises this are demonstrated.
  • the display device 100 includes a cover glass 10, an outer plate 20 having a flat plate shape, a circuit board 30 disposed on the outer plate 20, and a display mounted on the circuit board 30. 40.
  • the surface of the display 40 constitutes an image display unit 42.
  • the cover glass 10 is attached to the exterior plate 20 (see arrow AR).
  • the cover glass 10 seals the circuit board 30 and the display 40 on the exterior plate 20.
  • the cover glass 10 is disposed so as to cover the image display unit 42 of the display 40.
  • the cover glass 10 may be provided with an opening at a position corresponding to a speaker (not shown) mounted on the circuit board 30 or an operation button part (not shown) of the display device 100.
  • the opening penetrates in the thickness direction from one main surface side of the cover glass 10 toward the other main surface side.
  • the cover glass 10 has a main plate portion 13 and a side plate portion 16.
  • the cover glass 10 has an outer surface 11 and an inner surface 12, and the outer surface 11 of the cover glass 10 is composed of an outer surface of the main plate portion 13 and an outer surface of the side plate portion 16. Further, the inner surface 12 of the cover glass 10 is composed of an inner surface of the main plate portion 13 and an inner surface of the side plate portion 16.
  • the main plate portion 13 has a substantially flat shape. In a state where the cover glass 10 is attached to the display 40, the outer surface side of the main plate portion 13 is mainly exposed to the outside.
  • the side plate portion 16 has an annular shape as a whole, and is continuously provided on the outer edge of the main plate portion 13.
  • the side plate portion 16 is configured to move away from the outer surface of the main plate portion 13 as it goes outward from the outer edge of the main plate portion 13.
  • the side plate portion 16 may be formed into a flat plate shape, or is formed into a curved plate shape that curves in a direction away from the outer surface of the main plate portion 13 as it goes outward from the outer edge of the main plate portion 13. Also good. Further, it is not always necessary that the side plate portion 16 is provided in an annular shape around the entire circumference of the main plate portion 13, but only on a part of the outer edge of the main plate portion 13 (for example, a pair of opposing sides of the main plate portion 13 having a substantially rectangular shape in plan view). Only) the side plate portion 16 may be provided.
  • light L (see FIG. 2) including predetermined image information is transmitted through the main plate portion 13 from the inner surface 12 side located on the image display unit 42 side of the cover glass 10 toward the outer surface 11 side. To do. Thereby, the various image information displayed on the image display part 42 is recognized by the user.
  • the outer surface 11 of the cover glass 10 constitutes a touch panel display surface, the outer surface 11 is pressed by a user's finger or a pen or the like.
  • the linear expansion coefficient ⁇ of the glass is desirably 70 [ ⁇ 10 ⁇ 7 / ° C.] or more and 110 [ ⁇ 10 ⁇ 7 / ° C.] or less in a temperature range of 100 [° C.] to 300 [° C.].
  • a glass having a linear expansion coefficient ⁇ of 98 [ ⁇ 10 ⁇ 7 / ° C.] in the range of 100 ° C. to 300 ° C. may be used.
  • the glass viscosity is ⁇ [dPa ⁇ s]
  • FIG. 3 is a schematic diagram showing a configuration of a glass molded product manufacturing apparatus according to the present embodiment. With reference to FIG. 3, the manufacturing apparatus 50 of the glass molded product which concerns on this Embodiment is demonstrated.
  • the glass molded product manufacturing apparatus 50 mainly includes a molten glass supply unit 70, a cutting unit 80, a molding unit 60, and a control unit 90.
  • the molten glass supply unit 70 is a part for melting the glass material and supplying the molten glass to the forming unit 60.
  • the cutting unit 80 is a part for adjusting the amount of molten glass supplied from the molten glass supply unit 70 to the forming unit 60 to an appropriate amount.
  • the molding unit 60 is a part for pressure-molding the supplied molten glass using a mold.
  • the control unit 90 is a part for controlling the operations of the cutting unit 80 and the molding unit 60 described above.
  • the molten glass supply unit 70 includes a continuous melting furnace 71, a nozzle unit 72, and an outflow pipe 73.
  • the continuous melting furnace 71 melts a glass material and stores the molten glass
  • the nozzle portion 72 introduces the molten glass stored in the continuous melting furnace 71 into the outflow pipe 73.
  • the outflow pipe 73 has an outflow port 73a at its lower end, and continuously flows out the molten glass flow 10D from the outflow port 73a vertically downward.
  • the cutting unit 80 includes a cutter 81 and a cutter driving mechanism 82 as a cutting mechanism.
  • the cutter 81 cuts the molten glass flow 10D flowing out from the outflow pipe 73 and separates the cut portion from the molten glass flow 10D, and is driven by the cutter driving mechanism 82 described above.
  • the cutter 81 is configured by a pair of flat plate-shaped shear blades, and the pair of shear blades are abutted below the outflow pipe 73 to cut the molten glass flow 10D.
  • the cutter driving mechanism 82 receives a command from the control unit 90 and drives the cutter 81.
  • various types can be used, but preferably an air cylinder, a servo motor, a hydraulic cylinder, a linear motor, a stepping motor, or the like can be used.
  • the molding unit 60 includes a first mold 61, a second mold 62, a first mold drive mechanism 63, and a second mold drive mechanism 64.
  • die 62 are a metal mold
  • the first mold 61 moves by being driven by the first mold driving mechanism 63 described above, and the second mold 62 is moved by being driven by the second mold driving mechanism 64 described above.
  • Materials for forming the first mold 61 and the second mold 62 include heat-resistant alloys (stainless alloys, etc.), super steel materials mainly composed of tungsten carbide, and various ceramics (silicon carbide, silicon nitride, aluminum nitride, etc.). Further, it can be appropriately selected from known materials as a mold for producing a glass molded article such as a composite material containing carbon.
  • the first mold 61 and the second mold 62 may be made of the same material, or may be made of different materials.
  • the surfaces of the first mold 61 and the second mold 62 are preferably covered with a predetermined coating layer from the viewpoint of improving durability and preventing fusion with molten glass.
  • the material of the coating layer is not particularly limited. For example, various metals (chromium, aluminum, titanium, etc.), nitrides (chromium nitride, aluminum nitride, titanium nitride, boron nitride, etc.), oxides (chromium oxide) , Aluminum oxide, titanium oxide, etc.) can be used.
  • the method for forming the coating layer is not particularly limited, and for example, a vacuum deposition method, a sputtering method, a CVD method, or the like can be used.
  • the first mold 61 and the second mold 62 are configured to be heated to a predetermined temperature by a heating means (not shown).
  • the heating means is not particularly limited, but a known heating means can be appropriately selected and used.
  • a cartridge heater that is used by being embedded inside the member to be heated, a sheet heater that is used while being in contact with the outside of the member to be heated, an infrared heating device, a high-frequency induction heating device, or the like can be used as the heating means.
  • 1st mold drive mechanism 63 moves the 1st mold 61 in the DR1 direction (horizontal direction) shown by the arrow in Drawing 1 by receiving the command from control part 90, and driving.
  • the second mold drive mechanism 64 is driven in response to a command from the control unit 90, thereby moving the second mold 62 in the DR2 direction (horizontal direction) indicated by an arrow in FIG.
  • Various types can be used as the first mold driving mechanism 63 and the second mold driving mechanism 64, but preferably a servo motor, an air cylinder, a hydraulic cylinder, a linear motor, a stepping motor, or a combination thereof. Is available.
  • a mode for controlling the first mold driving mechanism 63 and the second mold driving mechanism 64 by the control unit 90 a mode for controlling the positions of the first mold 61 and the second mold 62 (position control mode), There is a mode (load control mode) for controlling the load relatively loaded on the first mold 61 and the second mold 62, and it is preferable that these two control modes are switchable.
  • the first mold driving mechanism 63 and the second mold driving mechanism 64 can press-mold molten glass with a maximum pressing force of 3 tons using the first mold 61 and the second mold 62. It is preferable that it is comprised.
  • the control unit 90 controls the operations of the cutter driving mechanism 82, the first mold driving mechanism 63, and the second mold driving mechanism 64 described above. That is, the control unit 90 manufactures a cover glass as a glass molded product such as the timing of cutting the molten glass flow 10D by the cutter 81, the timing of movement of the first mold 61, and the timing of movement of the second mold 62. A series of such sequences is controlled.
  • FIG. 4 is a schematic cross-sectional view of the first mold and the second mold shown in FIG.
  • FIG. 5 is an enlarged view of the area surrounded by the V line shown in FIG. The first mold 61 and the second mold will be described with reference to FIGS. 4 and 5.
  • the first mold 61 includes a first molding surface 61 a for molding the outer surface of the main plate portion 13 and a second molding surface 61 b for molding the outer surface of the side plate portion 16. And a recess 65 provided in the vicinity of the boundary between the first molding surface 61a and the second molding surface 61b.
  • the boundary between the first molding surface 61a and the second molding surface 61b is a portion where the plane including the first molding surface 61a and the plane including the second molding surface 61b intersect. This corresponds to P2 shown in FIG.
  • the first molding surface 61a is configured by a substantially rectangular flat surface.
  • the first molding surface 61a is connected to the second molding surface 61b via the recess 65.
  • the recess 65 covers the entire area along the extending direction of the boundary between the first molding surface 61a and the second molding surface 61b when viewed from the direction in which the first mold 61 and the second mold 62 are arranged. Is provided.
  • the recess 65 has an end portion P1 and an end portion P2, and an opening surface that passes through the end portion P1 and the end portion P2.
  • the opening surface is located on the same plane as the first molding surface 61a, and the depth direction of the recess 65 is parallel to the normal direction of the first molding surface 61a.
  • the recessed part 65 is formed so that the said opening surface may become a maximum outer dimension, and has a shape which can be mold-released with a molten glass in the manufacturing process mentioned later.
  • a recess 65 is provided.
  • the recess 65 When a part of the recess 65 is located on the second molding surface 61b side with respect to the virtual plane 69, the recess 65 is filled when the first mold 61 is released from the glass molded product after pressure molding.
  • die 61 contact the glass molded product after pressure forming will be broken.
  • the recess 65 is a boundary between the third molding surface 62a and the fourth molding surface 62b of the second mold 62, which will be described later, in the state where the first mold 61 and the second mold 62 are opposed to each other. It is formed so as to face the part.
  • the boundary between the third molding surface 62a and the fourth molding surface 62b refers to a portion where the plane including the third molding surface 62a and the plane including the fourth molding surface 62b intersect, and in FIG. It corresponds to P3 shown.
  • the width of the recess 65 is preferably greater than 0 mm and 2.0 mm or less, and the depth of the recess 65 (the most recessed portion of the recess from P1 along the horizontal direction) Is preferably greater than 0 mm and not greater than 2.0 mm.
  • the width of the recess 65 is more preferably 1.0 mm or more and 2.0 mm or less, and the depth of the recess 65 is preferably 0.5 mm or more and 2.0 mm or less.
  • the size of the concave portion 65 is larger than the width 2.0 mm and the depth 2.0 mm, the temperature of the molten glass itself retained in the concave portion 65 in the pressure forming step described later is lowered, and the molten glass shrinks. Excessive stress is applied and cracking is likely to occur.
  • the concave portion 65 when the concave portion 65 is not formed, in the pressure molding process, melting is performed between the first molding surface 61a and the third molding surface 62a and between the second molding surface 61b and the fourth molding surface 62b.
  • the molten glass is easily shrunk due to a decrease in the speed of the molten glass. As a result, curing of the molten glass proceeds, and it becomes impossible to reduce the thickness.
  • the molten glass is formed between the second molding surface 61b and the fourth molding surface between the first molding surface 61a and the third molding surface 62a.
  • moving between the molding surface 62b it is possible to move more easily.
  • the second molding surface 61b is provided continuously from the end P2 of the recess 65 on the second molding surface 61b side.
  • the second molding surface 61b has an inclined surface that moves away from the first molding surface 61a as it moves away from the first molding surface 61a along the normal direction of the first molding surface 61a.
  • the inclination angle formed by the second molding surface 61b and the normal line of the first molding surface 61a is preferably 1 ° or more and 10 ° or less.
  • the inclination angle is smaller than 1 °, in the manufacturing process described later, when the first mold 61 is released from the glass molded product after pressure molding, the first mold 61 and the pressure molded There is a case where cracks occur due to contact with the glass molded product. Further, when the tilt angle is larger than 10 °, excellent design properties cannot be obtained.
  • the second molding surface 61b does not need to be composed only of an inclined surface, and may include a substantially arcuate curved surface that connects the end portion P2 of the recess 65 and the inclined surface. Good.
  • the second mold 62 includes a third molding surface 62a for molding the inner surface of the main plate portion 13 and a fourth molding surface 62b for molding the inner surface of the side plate portion 16.
  • the third molding surface 62a is configured by a substantially rectangular flat surface.
  • a fourth molding surface 62b is continuously provided from the end P3 of the third molding surface 62a.
  • the fourth molding surface 62b has an inclined surface that moves away from the third molding surface 62a along a direction parallel to the third molding surface 62a as it moves away from the third molding surface 62a along the normal direction of the third molding surface 62a. .
  • the inclination angle formed by the fourth molding surface 62b and the normal line of the third molding surface 62a is preferably 1 ° or more and 10 ° or less.
  • the inclination angle is smaller than 1 °, the second mold 62 and the glass molded product after pressure molding come into contact when the second mold 62 is released from the glass molded product after pressure molding. And cracks may occur.
  • the tilt angle is larger than 10 °, excellent design properties cannot be obtained.
  • the fourth molding surface 62b does not need to be composed only of an inclined surface, and includes a substantially arc-shaped curved surface that connects between the end portion P3 of the third molding surface 62a and the inclined surface. May be.
  • the first cavity portion 91 which is a portion corresponding to the main plate portion 13 is defined by the first molding surface 61a and the third molding surface 62a.
  • a second cavity portion 92 including a portion corresponding to the side plate portion 16 is defined by the second molding surface 61b and the fourth molding surface 62b, and the molten glass corresponding to the convex portion 17 of the glass molded product described later by the concave portion 65.
  • a retention portion 93 is defined.
  • FIG. 6 is a flowchart showing a method for manufacturing a glass molded product according to the present embodiment.
  • 7 to 10, FIG. 12, and FIG. 13 are diagrams showing a predetermined step and a state after the predetermined step in the flow shown in FIG.
  • FIG. 11 is an enlarged view of the area surrounded by the XI line shown in FIG.
  • FIGS. 6 to 12 a method for manufacturing a glass molded product according to the present embodiment will be described.
  • the first mold and the second mold are arranged to face each other.
  • the first mold 61 and the second mold 62 are previously set so that the first molding surface 61a and the third molding surface 62a face each other through a position below the outflow pipe 73. It arrange
  • the first mold 61 and the second mold 62 are arranged so that the first molding surface 61a and the third molding surface 62a are orthogonal to the horizontal plane, and thereby the first mold 61 and the second mold 62 are arranged. Are opposed to each other along the horizontal direction.
  • the first mold 61 and the second mold 62 are moved to the initial positions P11 and P21 by the controller 90 driving the first mold drive mechanism 63 and the second mold drive mechanism 64. .
  • the predetermined temperature may be a temperature at which a good transfer surface can be formed on a glass molded product.
  • the temperature of the molding part 60 is set in the range of (Tg ⁇ 100) ° C. to (Tg + 100) ° C. with respect to the glass transition temperature Tg of the glass to be pressed.
  • an appropriate temperature is determined in consideration of various conditions such as the type of glass, the shape and size of the glass molded product, the material of the molded part 60, and the type of protective film.
  • the heating temperature of the first mold 61 and the second mold 62 may be the same temperature or different temperatures.
  • the molding unit 60 is heated to a predetermined temperature, and then a high-temperature molten glass in a melted state is supplied and subjected to pressure molding, so that the temperature of the molding unit 60 is kept constant. These steps can be performed. Furthermore, it is possible to repeatedly manufacture a plurality of glass molded products while keeping the temperature of the molding unit 60 constant. Therefore, since it is not necessary to repeat the temperature rise and cooling of the molding unit 60 every time one glass molded product is manufactured, the glass molded product can be manufactured efficiently in an extremely short time.
  • keeping the temperature of the molding part 60 constant means that the target set temperature in the temperature control for heating the molding part 60 is kept constant. Therefore, it is not intended to prevent the temperature fluctuation of the molded part 60 due to contact with the molten glass or the like during execution of each process, and such temperature fluctuation is allowed.
  • FIG. 7 is a diagram illustrating a process of supplying the cut molten glass lump shown in FIG. 6 to the gap between the first mold and the second mold.
  • a vertical direction is provided in the gap between the first mold 61 and the second mold 62 disposed at the initial positions P ⁇ b> 11 and P ⁇ b> 21.
  • a molten glass lump 10E is supplied along Such a molten glass lump 10E is cut by the cutter 81 when the length of the molten glass flow 10D flowing out vertically from the outlet 73a of the outlet pipe 73 reaches a predetermined length. Is obtained.
  • the molten glass flow 10D is performed by the control unit 90 using the cutter drive mechanism 82 to move the cutter 81 in the direction of arrow B toward the molten glass flow 10D.
  • the original position is restored by moving in the opposite direction.
  • the molten glass lump is pressure-molded by the first mold and the second mold.
  • 8 to 10 are views showing the first to third steps of the step of press-molding the molten glass lump with the first die and the second die shown in FIG.
  • the molten glass lump 10 ⁇ / b> E has the first mold 61 and the second mold.
  • the first mold 61 and the second mold 62 are moved in the horizontal direction (arrow C1 direction and arrow C2 direction) so that the first molding surface 61a and the third molding surface 62a approach each other at the timing of falling between the molds. Move to.
  • the falling molten glass lump 10E first comes into contact with and adheres to the third molding surface 62a of the second mold 62.
  • the molten glass lump 10E attached to the third molding surface 62a of the second mold 62 is caused on the third molding surface 62a by the impact. Can spread wet.
  • the molten glass instantaneously spreads substantially uniformly along the direction parallel to the third molding surface 62a, and high transferability can be obtained in the pressure molding process described later.
  • the first die 61 and the second die 62 are further The first mold 61 and the second mold 62 are moved in the horizontal direction (the direction of the arrow C1 and the direction of the arrow C2) so that the molten glass lump 10E is dropped.
  • the temperature of the portion located on the second mold 62 side and not in contact with the first mold 61 is higher than the temperature of the first mold 61 and the second mold 62. It is high.
  • the temperature of the molten glass is lowered by the heat of the molten glass being taken away by the mold.
  • the temperature of the molten glass lump 10E located between the second molding surface 61b and the fourth molding surface 62b is lowered by the heat of the molten glass lump 10E staying in the recess 65. Can be suppressed.
  • a part of the molten glass lump 10E can be retracted into the recess 65, so that friction at the time of changing the moving direction of the molten glass lump 10E can be reduced. Thereby, the molten glass lump 10E can be easily moved toward between the second molding surface 61b and the fourth molding surface 62b.
  • This also can suppress a decrease in the temperature of the molten glass lump 10E due to a decrease in the moving speed of the molten glass lump 10E.
  • the molten glass lump 10E becomes the second shaping surface 61b and the fourth shaping surface. It is possible to suppress partial thermal shrinkage between the molding surface 62b and partial curing. As a result, the 1st metal mold
  • the first die 61 and the second die 62 is moved to the stop positions P12 and P22 to approach them.
  • the molten glass lump 10E further expanded by bringing the first mold 61 and the second mold 62 closer to each other is in the first cavity portion 91 defined by the first molding surface 61a and the third molding surface 62a.
  • the second cavity portion 92 can be sufficiently filled with glass by suppressing the partial hardening of the molten glass lump 10E as described above. As a result, transferability and releasability can be ensured, and cracking during molding can be prevented.
  • the inside of the first cavity portion 91, the second cavity portion 92, and the inside of the molten glass retention portion 93 are filled with the molten glass lump 10E, so that the molten glass lump 10E has the first mold 61 and the second mold.
  • the mold 62 is pressurized at a predetermined pressure, and the molten glass lump 10E is pressure-molded.
  • the temperature of the molten glass at the start of the pressure treatment is preferably set to (Tg + 150) [° C.] or more and (Tg + 300) [° C.] or less with respect to the glass transition temperature Tg [° C.].
  • Tg glass transition temperature
  • the temperature of the molten glass just before pressing may be 780 [° C.].
  • the temperature of the first mold 61 is set to (Tg-80) [° C.] or more and (Tg-10) [° C.] or less
  • the second mold 62 The temperature may be set to (Tg-60) [° C] or higher and (Tg-20) [° C] or lower.
  • Tg is 540 [° C.]
  • the temperature of the first mold 61 may be set to 520 [° C.] and the temperature of the second mold 62 may be set to 500 [° C.].
  • a pressure of 1.2 tons is applied to the molten glass lump 10E for 2 seconds.
  • the molten glass lump 10E is pressure-molded, and the glass molded product 10F is molded.
  • step (S14) the pressurization by the first mold and the second mold is released, and the glass molded product manufactured in the step (S15) becomes the first mold and The mold is released from the second mold.
  • FIG. 12 is a diagram showing a step of removing unnecessary portions of the released glass molded product shown in FIG. 6 by polishing and chamfering.
  • the glass molded product 10 ⁇ / b> F taken out after the mold release is located around the product planned area constituted by the main plate portion 13 and the side plate portion 16 and the product planned area, and is mainly constituted by the convex portion 17. To be reserved.
  • the spare area is defined by, for example, a broken line E that crosses the end portion of the convex portion 17 on the main plate portion 13 side and a part of the molding surface formed by the second molding surface 61b. It corresponds to the part.
  • FIG. 13 is a diagram illustrating a state after the step of removing unnecessary portions of the glass molded product illustrated in FIG. 6 by polishing and chamfering.
  • the manufacturing of the thin cover glass 10 is completed as shown in FIG.
  • the width of the recess 65 provided in the first mold 61 (the distance between P1 and P2 (FIG. 11 Reference)) is 1.5 mm
  • the depth of the recess 65 is 1.2 mm
  • the thickness T1 of the main plate portion 13 can be about 0.9 mm
  • the thickness T2 of the side plate portion 16 is It can be set to 1.2 mm.
  • the outer surface and the inner surface of the glass molded product after mold release are both molded into a mirror surface or a state close thereto by pressure molding. Therefore, as the additional processing required after pressure molding, it is only necessary to grind and chamfer and remove unnecessary portions including the convex portions 17 of the glass molded product that has been pressure molded. No additional polishing process is required.
  • the molten glass dropped in the vertical direction between the first mold 61 and the second mold disposed opposite to each other in the horizontal direction is caused by the first mold 61 and the second mold 62.
  • the case of pressure molding has been described as an example.
  • the present invention is not limited to this, and the first mold 61 is used as a lower mold and the second mold is used as an upper mold to face the outflow pipe of the molten glass supply unit.
  • the molten glass dropped onto the first mold arranged in this manner may be pressure-molded by the first mold and the second mold arranged opposite to each other in the vertical direction after dropping.
  • the present invention is not limited to this, and is dropped in the vertical direction.
  • the first mold 61 may be first contacted with the molten glass lump 10E, or the first mold 61 and the second mold 62 may be simultaneously contacted with the molten glass lump 10E.
  • the concave portion 65 is exemplified such that the end portion P2 thereof is provided so that the boundary portion between the first molding surface 61a and the second molding surface 61b coincides.
  • the present invention is not limited to this, and the concave portion 65 may be provided in a portion near the first molding surface 61a away from the boundary portion, or may be provided so as to straddle the boundary portion. Alternatively, it may be provided only on the second molding surface 61b.
  • the cover glass with which a smart phone and a tablet terminal were equipped was illustrated and demonstrated as a glass molded article manufactured by applying this invention, it is limited to this.
  • the present invention may be applied to the manufacture of cover glasses for other display devices, and the manufacture of exterior covers for electronic devices such as mobile computers and digital cameras.
  • the present invention may be applied to the manufacture of an optical recording medium.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

　L'invention porte sur un procédé pour la fabrication d'un article en verre moulé, comprenant une étape consistant à placer un premier moule (61) et un second moule (62) à l'opposé l'un de l'autre pour mouler par pression du verre fondu (10E) et une étape consistant à prendre en sandwich le verre fondu (10E) entre le premier moule (61) et le second moule (62) et à mouler par pression. Le premier moule (61) comprend une première surface de moulage (61a) et une deuxième surface de moulage (61b) et le second moule (62) comprend une troisième surface de moulage (62a) et une quatrième surface de moulage (62b). Un moule doté de creux (65) à proximité de la partie de bord est utilisé comme premier moule (61) dans l'étape de moulage par pression afin qu'au moins une partie du verre fondu (10E) qui a été poussé et étalé par la première surface de moulage (61a) et la troisième surface de moulage (62a) reste à proximité de la partie de bord de la première surface de moulage (61a) et de la deuxième surface de moulage (61b).
PCT/JP2014/059409 2013-06-11 2014-03-31 Procédé pour la fabrication d'article en verre moulé et dispositif pour la fabrication d'article en verre moulé WO2014199702A1 (fr)

Applications Claiming Priority (2)

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JP2013-122625 2013-06-11
JP2013122625 2013-06-11

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WO2014199702A1 true WO2014199702A1 (fr) 2014-12-18

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000281362A (ja) * 1999-03-31 2000-10-10 Hoya Corp 肉薄板状ガラスの製造方法及び肉薄板状ガラス用成形型
JP2005263574A (ja) * 2004-03-19 2005-09-29 Konica Minolta Opto Inc 情報記録媒体用ガラス基板の製造方法
JP2012106895A (ja) * 2010-11-19 2012-06-07 Konica Minolta Opto Inc ガラス光学素子およびその製造方法
JP2012214361A (ja) * 2011-03-30 2012-11-08 Hoya Corp 電子機器用カバーガラスブランクの製造方法および電子機器用カバーガラスの製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000281362A (ja) * 1999-03-31 2000-10-10 Hoya Corp 肉薄板状ガラスの製造方法及び肉薄板状ガラス用成形型
JP2005263574A (ja) * 2004-03-19 2005-09-29 Konica Minolta Opto Inc 情報記録媒体用ガラス基板の製造方法
JP2012106895A (ja) * 2010-11-19 2012-06-07 Konica Minolta Opto Inc ガラス光学素子およびその製造方法
JP2012214361A (ja) * 2011-03-30 2012-11-08 Hoya Corp 電子機器用カバーガラスブランクの製造方法および電子機器用カバーガラスの製造方法

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