WO2014203636A1 - Procédé de fabrication d'articles en verre moulé et dispositif de fabrication - Google Patents

Procédé de fabrication d'articles en verre moulé et dispositif de fabrication Download PDF

Info

Publication number
WO2014203636A1
WO2014203636A1 PCT/JP2014/062233 JP2014062233W WO2014203636A1 WO 2014203636 A1 WO2014203636 A1 WO 2014203636A1 JP 2014062233 W JP2014062233 W JP 2014062233W WO 2014203636 A1 WO2014203636 A1 WO 2014203636A1
Authority
WO
WIPO (PCT)
Prior art keywords
glass
molten glass
mold
pair
molding
Prior art date
Application number
PCT/JP2014/062233
Other languages
English (en)
Japanese (ja)
Inventor
博久 北野
Original Assignee
コニカミノルタ株式会社
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 コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Publication of WO2014203636A1 publication Critical patent/WO2014203636A1/fr

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
    • C03B7/10—Cutting-off or severing the glass flow with the aid of knives or scissors or non-contacting cutting means, e.g. a gas jet; Construction of the blades used
    • 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
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • C03B11/082—Construction of plunger or mould for making solid articles, e.g. lenses having profiled, patterned or microstructured surfaces
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/02—Press-mould materials
    • C03B2215/05—Press-mould die materials
    • C03B2215/06—Metals or alloys
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/50—Structural details of the press-mould assembly
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/72—Barrel presses or equivalent, e.g. of the ring mould type
    • C03B2215/73—Barrel presses or equivalent, e.g. of the ring mould type with means to allow glass overflow in a direction perpendicular to the press axis

Definitions

  • the present invention relates to a glass molded product manufacturing method and a manufacturing apparatus for manufacturing a glass molded product by press-molding molten glass using a die placed opposite to each other based on a so-called direct press method.
  • a thin cover glass provided in a display device typified by a smartphone or a tablet terminal is widely used.
  • the cover glass is a portion that appears exposed on the outer surface of a display device or the like, and its front and back surfaces are required to be mirror-finished.
  • Mirror finish can be realized by polishing the glass blank.
  • a separate polishing process is required in addition to various processes for manufacturing a glass blank, which complicates the manufacturing process and leads to an increase in manufacturing cost. End up.
  • 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 periphery of the main plate portion is required.
  • a cover glass having such a complicated three-dimensional shape it may be difficult to polish the surface due to the shape.
  • a so-called direct press method is proposed in which molten glass is directly pressure-molded into a final shape or a shape close thereto using a mold.
  • the direct press method there is an advantage that the surface can be finished in a mirror surface or in a state close to it without performing a polishing process on the surface.
  • Patent Document 1 Japanese Patent Laid-Open No. 2000-319026
  • Patent Document 2 Japanese Patent Laid-Open No. 2012-214361 disclose a specific manufacturing method in the case of manufacturing a glass molded article by applying the direct press method described above.
  • molten glass is supplied to the molding surface of the lower mold, and in this state, the molten glass is sandwiched in the vertical direction using the upper mold and the lower mold.
  • a glass molded product is manufactured by pressure molding.
  • the molten glass is in contact with the lower mold prior to the upper mold contacting the molten glass.
  • the molten glass in the part in contact with the glass is rapidly cooled, a large temperature difference will occur in the molten glass, and not only a glass molded product in a good state can be obtained, but also the molten glass is cured. As the process proceeds rapidly, it may be difficult to form the molten glass into a thin plate shape.
  • the glass molded product to be manufactured has a non-disc shape (for example, a rectangular plate shape or the above-mentioned substantially box shape)
  • a non-disc shape for example, a rectangular plate shape or the above-mentioned substantially box shape
  • the present invention has been made to solve such problems, and is a novel glass based on the direct press method that can efficiently produce a thin glass molded product with excellent moldability. It aims at providing the manufacturing method and manufacturing apparatus of a molded article.
  • the method for producing a glass molded product according to the present invention includes a step of dropping molten glass, a step of receiving the dropped molten glass in a reservoir receiving portion, and a pressing portion for receiving the molten glass stored in the reservoir receiving portion.
  • a step of pressure-molding by sandwiching the molten glass from both sides along the thickness direction using a pair of molding dies.
  • An apparatus for manufacturing a glass molded product according to the present invention includes a material supply unit that drops molten glass, a reservoir receiving unit that stores the dropped molten glass, and a press that presses the molten glass stored in the reservoir receiving unit.
  • An extrusion passage including a slit-like opening for extruding the molten glass pressed by the pressing portion toward the outside of the reservoir receiving portion, and a substantially plate shape by being extruded from the extrusion passage.
  • a pair of molding die parts that are pressure-molded by sandwiching the formed molten glass from both sides along the thickness direction.
  • the present invention it is possible to provide a glass molded product manufacturing method and a manufacturing apparatus based on the direct press method capable of efficiently manufacturing a thin glass molded product with excellent moldability.
  • FIG. 2 is a schematic cross-sectional view taken along line II-II of the display device shown in FIG.
  • It is a schematic block diagram of the manufacturing apparatus of the glass molded product in embodiment of this invention.
  • It is a schematic cross section of the state which combined the 1st metal mold
  • FIG. 5 which presses a molten glass using a piston. It is a figure which shows the process of pressure-molding molten glass shown in FIG. It is a figure which shows the process of canceling
  • FIG. 1 is a schematic perspective view of a state in which a display device including a cover glass manufactured according to the method for manufacturing a glass molded product in the embodiment of the present invention is partially disassembled
  • FIG. 2 is a display device shown in FIG. It is a schematic cross section along the II-II line.
  • the display device 100 has a flat and substantially rectangular shape as a whole, and covers the cover glass 110, a flat plate-shaped outer plate 120, and the outer plate 120. It mainly includes a circuit board 130 arranged, a display 140 and a speaker 131 mounted on the circuit board 130. The upper surface of the display 140 constitutes an image display unit 142.
  • the cover glass 110 is made of a glass molded product formed by a direct press method.
  • the cover glass 110 is assembled on the exterior plate 120 from above (along the arrow AR direction in the drawing) so as to seal the internal components represented by the circuit board 130 and the display 140 with the exterior plate 120. Attached.
  • the cover glass 110 has a substantially box shape, and is provided on the periphery of the main plate portion 111 and a flat main plate portion 111 having a substantially rectangular shape in plan view provided so as to cover the image display portion 142 of the display 140. And four side plate portions 112 fixed to the exterior plate 120 by being continuously provided downward from the four sides. Thereby, the cover glass 110 has the front surface 110a exposed to the outside of the display device 100 after the assembly and the back surface 110b not exposed to the outside.
  • a hole 113 is provided at a position corresponding to the speaker 131 of the cover glass 110.
  • the hole 113 passes through the main plate 111 of the cover glass 110 so as to reach the back surface 110b from the front surface 110a. As a result, the speaker 131 is exposed to the outside through the hole 113.
  • the light L including predetermined image information emitted from the image display unit 142 is directed from the back surface 110 b side of the cover glass 110 toward the front surface 110 a side. 110 is transmitted.
  • the image information displayed on the image display unit 142 is recognized by the user.
  • the front surface 110a of the cover glass 110 constitutes the display surface of the touch panel, the front surface 110a is pressed by the user's fingers or a touch pen.
  • a substantially box-shaped cover having a flat main plate portion 111 having a substantially rectangular shape in plan view and four side plate portions 112 arranged continuously from four sides located at the periphery of the main plate portion 111.
  • a cover glass having a shape in which the side plate portion is continuously provided from only a part of the peripheral edge of the flat plate-like main plate portion may be used. You may use the cover glass which consists only of a flat main plate part without having.
  • the shape of the main plate portion is not limited to a substantially rectangular shape in plan view, and other shapes may be used, and the shape of the side plate portion may be inclined or curved.
  • the linear expansion coefficient ⁇ of the cover glass 110 is preferably 70 [ ⁇ 10 ⁇ 7 / ° C.] or more and 110 [ ⁇ 10 ⁇ 7 / ° C.] or less in a temperature range of 100 [° C.] or more and 300 [° C.] or less.
  • 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]
  • the outer shape of the cover glass 110 is preferably in a range of 40 [mm] ⁇ 40 [mm] or more and 300 [mm] ⁇ 300 [mm] or less in a plan view. Moreover, it is preferable that the total height along the normal direction of the front surface 110a of the main plate portion 111 of the cover glass 110, that is, the total height of the side plate portion 112 is 1 [mm] or more and 10 [mm] or less. Within such a range, the glass molded product manufacturing method and manufacturing apparatus in the present embodiment to be described later can be used particularly preferably.
  • the front surface 110a and the back surface 110b of the cover glass 110 must both be mirror-finished or close to this state.
  • the surface roughness of the front surface 110a and the back surface 110b of the cover glass 110 is preferably set to approximately 0.5 [nm] or more and 20 [nm] or less.
  • the manufacturing method and the manufacturing apparatus of the molded product can form the cover glass 110 so as to satisfy the conditions.
  • FIG. 3 is a schematic configuration diagram of a glass molded product manufacturing apparatus according to an embodiment of the present invention.
  • FIG. 4 is a schematic cross-sectional view of a state in which the first mold, the auxiliary mold, the piston, and the second mold shown in FIG. 3 are combined. Next, with reference to these FIG. 3 and FIG. 4, the structure of the manufacturing apparatus of the glass molded product in this Embodiment is demonstrated.
  • the apparatus for producing a glass molded product in the present embodiment produces a cover glass as a glass molded product based on a so-called direct press method, and produces two cover glasses at a time in one production cycle, A plurality of cover glasses are sequentially manufactured by repeating the manufacturing cycle.
  • the glass molded product manufacturing apparatus 1 mainly includes a material supply unit 10, a molding unit 20, and a control unit 40.
  • the material supply unit 10 is a part for melting a glass material and supplying it to the molding unit 20, and the molding unit 20 is a part for pressure-molding the supplied glass material using a mold.
  • the control unit 40 is a part that controls the operations of the material supply unit 10 and the molding unit 20 described above.
  • the material supply unit 10 includes a continuous melting furnace 11, a nozzle unit 12, an outflow pipe 13, a cutter 14, and a cutter driving mechanism 15.
  • the continuous melting furnace 11 melts a glass material and stores the molten glass
  • the nozzle unit 12 introduces the molten glass stored in the continuous melting furnace 11 into the outflow pipe 13.
  • the outflow pipe 13 has an outflow port at the lower end thereof, and allows the molten glass 50 to flow out continuously from the outflow port vertically downward.
  • the cutter 14 cuts the molten glass 50 flowing out from the outflow pipe 13 and drops the cut portion, and is driven by the cutter driving mechanism 15 described above.
  • the cutter 14 is composed of a pair of planar shear blades, and the pair of shear blades are abutted below the outflow pipe 13 to cut the molten glass 50.
  • the cutter driving mechanism 15 receives a command from the control unit 40 and drives the cutter 14.
  • 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 20 includes a first mold 21 as a first member, an auxiliary mold 22 as a second member, a piston 23 as a third member, and a pair of second molds 24 as a fourth member, 24, a first mold drive mechanism 25, an auxiliary mold drive mechanism 26, a piston drive mechanism 27, and a pair of second mold drive mechanisms 28, 28.
  • the first mold 21 moves along the horizontal direction by being driven by the first mold drive mechanism 25 described above.
  • the auxiliary mold 22 moves along the horizontal direction and the vertical direction by being driven by the above-described auxiliary mold drive mechanism 26.
  • the piston 23 and the pair of second molds 24, 24 move along the vertical direction by being driven by the piston drive mechanism 27 and the pair of second mold drive mechanisms 28, 28, respectively.
  • the first mold 21, the auxiliary mold 22, the piston 23, and the pair of second molds 24, 24 are combined by placing them close to each other in a pressure molding process described later.
  • the pressure chamber 31, the pair of extrusion channels 33, 33, the pair of cavities 34, 34, and the pair of escape portions 35, 35 are provided.
  • the pressing chamber 31 is located at the central portion along the horizontal direction of the first mold 21, the auxiliary mold 22, the piston 23 and the pair of second molds 24, 24 in a combined state, which will be described later.
  • the reservoir receiving part 32 which receives the molten glass 50 in the reservoir receiving process is included.
  • the pair of extrusion channels 33 are positioned so as to sandwich the above-described pressing chamber 31 along the horizontal direction. Thereby, each of a pair of extrusion flow path 33 is each connected to the press chamber 31 in the edge part along the horizontal direction.
  • the pair of cavities 34 and 34 are positioned so as to sandwich the above-described pressing chamber 31 and the pair of extrusion channels 33 and 33 along the horizontal direction. Thereby, a pair of cavities 34 and 34 are matched and connected with a pair of extrusion flow paths 33 and 33 in the edge part along those horizontal directions, respectively.
  • the pair of relief portions 35, 35 are positioned so as to sandwich the above-described pressing chamber 31, the pair of extrusion channels 33, 33, and the pair of cavities 34, 34 along the horizontal direction. Thereby, a pair of relief parts 35 and 35 are matched and connected with a pair of cavities 34 and 34, respectively in the edge part along those horizontal directions.
  • the first mold 21 includes a reservoir receiving surface 21a that defines the above-described reservoir receiving portion 32 (pressing chamber 31), and a pair of first flow path forming surfaces 21b that respectively define the above-described pair of extrusion channels 33 and 33. , 21b, a pair of first molding surfaces 21c, 21c that respectively define the pair of cavities 34, 34, and a portion that respectively define the pair of relief portions 35, 35 described above.
  • the auxiliary mold 22 includes a portion that defines the above-described pressing chamber 31, a pair of second flow path forming surfaces 22b and 22b that respectively define the above-described pair of extrusion flow paths 33 and 33, and the above-described pair of relief portions. 35 and 35, a piston moving passage 22e through which the piston 23 is inserted, and a pair of second mold moving passages 22f and 22f through which the pair of second molds are inserted.
  • the first mold 21 is disposed vertically above the first mold 21 so as to face the first mold 21.
  • the piston 23 includes a pressing surface 23 a that defines the pressing chamber 31 described above, and is inserted into a piston moving passage 22 e provided in the auxiliary mold 22 so as to face the first mold 21. It is arranged vertically above the first mold 21.
  • the pair of second molds 24, 24 include second molding surfaces 24 c, 24 c that respectively define the pair of cavities 34, 34 described above, and the pair of second mold movements provided on the auxiliary mold 22.
  • the first mold 21 is disposed vertically above the first mold 21 so as to face the first mold 21.
  • the portion including the reservoir receiving surface 21a of the first mold 21 corresponds to a reservoir receiving portion 32 that receives the molten glass 50 in a reservoir receiving process described later, and the piston 23 causes the molten glass 50 to be received in a pressing process described later. Corresponds to the pressing part to be pressed.
  • the portion including the pair of first molding surfaces 21c and 21c of the first mold 21 and the pair of second molds 24 and 24 are formed by pressure molding the molten glass 50 in a pressure molding process described later. Corresponds to the mold part.
  • each of the pair of extrusion channels 33, 33 is configured to have a slit-shaped opening. More specifically, as described above, each of the pair of extrusion channels 33 and 33 includes the first channel forming surface 21b of the first mold 21 and the second channel forming surface 22b of the auxiliary mold 22.
  • the cross-sectional shape is configured to have an elongated, substantially rectangular opening having a major axis and a minor axis. Yes.
  • the major axis of the slit-shaped opening is arranged so as to extend along the horizontal direction
  • the minor axis of the slit-like opening is arranged so as to extend along the vertical direction. Yes.
  • the pressing chamber 31 is a combination of the first mold 21, the auxiliary mold 22, and the piston 23 and the reservoir receiving surface 21 a of the first mold 21 and one of the auxiliary molds 22 as described above. This is defined by the portion and the pressing surface 23 a of the piston 23, but the above-mentioned one of the reservoir receiving surface 21 a of the first mold 21 and the auxiliary mold 22 adjacent to the pair of extrusion flow paths 33, 33.
  • the portion is configured by inclined surfaces 21d, 21d, 22d, and 22d having a shape inclined toward the corresponding extrusion flow path 33 side.
  • each of the pair of cavities 34 and 34 has a shape corresponding to a cover glass as a glass molded article to be manufactured, and the pair of first molding surfaces 21c and 21c of the first mold 21 and the pair of first moldings.
  • the second mold surfaces 24c and 24c are defined so as to have a substantially box-shaped space.
  • the part adjacent to a pair of extrusion flow paths 33 and 33 mentioned above among a pair of cavities 34 and 34 is the side in which the main board part is located among the side plate parts of the cover glass as a glass molded article which should be manufactured. Corresponds to a portion forming a non-product region continuously provided from the end located on the opposite side.
  • the material for forming the first mold 21, the auxiliary mold 22, the piston 23 and the pair of second molds 24, 24 is a super steel material mainly composed of a heat-resistant alloy (stainless alloy, etc.) or tungsten carbide.
  • various ceramics silicon carbide, silicon nitride, aluminum nitride, etc.
  • composite materials containing carbon, and the like can be appropriately selected from known materials as molds for producing glass molded articles.
  • the first mold 21, the auxiliary mold 22, the piston 23, and the pair of second molds 24, 24 may be made of the same material, or may be made of different materials. Good.
  • the surfaces of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of second molds 24, 24 are provided with a predetermined coating layer from the viewpoint of improving durability and preventing fusion with the glass material.
  • the material of the coating layer is not particularly limited.
  • various metals chromium, aluminum, titanium, etc.
  • nitrides chromium nitride, aluminum nitride, titanium nitride, boron nitride, etc.
  • oxides chromium oxide
  • 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 21, the auxiliary mold 22, the piston 23, and the pair of second molds 24, 24 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.
  • each of the first mold driving mechanism 25 and the auxiliary mold driving mechanism 26 receives a command from the control unit 40 and receives the first mold in the DR1 direction (horizontal direction) indicated by an arrow in the drawing. 21 and the auxiliary mold 22 are moved. As a result, the first mold 21 and the auxiliary mold 22 are provided with a position for receiving the molten glass 50 vertically below the outflow pipe 13 (dropping position P1) and a piston for press-molding the received molten glass 50 under pressure. 23 and a position facing the pair of second molds 24, 24 (molding position P2) and a position for taking out the glass molded product after pressure molding (takeout position P3).
  • the auxiliary mold drive mechanism 26 receives a command from the control unit 40, and moves the auxiliary mold 22 in the DR3 direction (vertical direction) indicated by an arrow in the drawing at the take-out position P3.
  • Various types can be used as the first mold driving mechanism 25 and the auxiliary mold driving mechanism 26, but a servo motor, an air cylinder, a hydraulic cylinder, a linear motor, a stepping motor, or a combination of these is preferably used. it can.
  • the piston drive mechanism 27 and the pair of second mold drive mechanisms 28, 28 receive a command from the control unit 40, respectively, and the piston 23 and the pair of second mold dies in the DR2 direction (vertical direction) indicated by an arrow in the drawing. 24, 24 are moved.
  • the piston 23 and the pair of second molds 24, 24 reciprocate between a vertically upper position and a vertically lower position, respectively. Therefore, when the first mold 21 and the auxiliary mold 22 are arranged at the molding position P2, the piston 23 and the pair of second molds 24, 24 move, so that the piston 23 and the pair of second molds are moved.
  • the molds 24, 24, the first mold 21 and the auxiliary mold 22 approach and separate from each other.
  • FIG. Various types can be used as the piston drive mechanism 27 and the pair of second mold drive mechanisms 28, 28, 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 piston drive mechanism 27 by the control unit 40 a mode for controlling the position of the piston 23 (position control mode), a mode for controlling a load applied to the piston 23 (load control mode), and It is preferable that these two control modes can be switched.
  • the piston drive mechanism 27 is preferably configured to be able to press the molten glass 50 using the piston 23 with a pressing force of a maximum of 3 tons.
  • a mode for controlling the pair of second mold drive mechanisms 28, 28 by the control unit 40 a mode for controlling the position of the pair of second molds 24, 24 (position control mode) and a pair of second molds are controlled.
  • the pair of second mold drive mechanisms 28, 28 is configured to be capable of pressure-molding the molten glass 50 with a pressure of up to 3 tons using the pair of second mold drive mechanisms 28, 28. It is preferable that
  • the control unit 40 controls the operations of the cutter driving mechanism 15, the first mold driving mechanism 25, the auxiliary mold driving mechanism 26, the piston driving mechanism 27, and the pair of second mold driving mechanisms 28, 28 described above. That is, the control unit 40 determines the timing of cutting the molten glass 50 by the cutter 14, the timing of movement of the first mold 21, the timing of movement of the auxiliary mold 22, the timing of movement of the piston 23, and a pair of second molds. A series of sequences relating to the production of the glass molded product, such as the timing of movement of 24 and 24, is controlled.
  • FIG. 5 is a diagram showing a manufacturing flow according to the method for manufacturing a glass molded product in the embodiment of the present invention.
  • 6 to 14 FIG. 15A, and FIG. 15B are diagrams showing predetermined steps among the steps shown in FIG. Next, with reference to these FIG. 6 thru
  • the manufacturing method of the glass molded product in this Embodiment manufactures the cover glass as a glass molded product based on what is called a direct press method, and uses the manufacturing apparatus 1 of the glass molded product in this Embodiment mentioned above. Can be suitably implemented. Moreover, the manufacturing method of the glass molded product in this Embodiment manufactures two cover glasses at once by implementing the series of processes mentioned later in one manufacturing cycle, and the said manufacturing cycle is repeated. Thus, a plurality of cover glasses are sequentially manufactured.
  • the first mold 21, the auxiliary mold 22, the piston 23, and the pair of second molds 24, 24 described above are each predetermined in advance by the heating means described above. Heated to temperature.
  • the predetermined temperature means a temperature at which a good transfer surface can be formed on a cover glass as a glass molded product.
  • the temperature of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of second molds 24, 24 is too low, the molten glass 50 is rapidly cooled, and the fluidity of the molten glass 50 is increased. Is impaired, and it becomes difficult to form a highly accurate transfer surface.
  • the temperature of the first mold 21, the auxiliary mold 22, the piston 23 and the pair of second molds 24, 24 is excessively increased, fusion with the molten glass 50 occurs. This is not preferable because the life of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of second molds 24, 24 may be shortened.
  • the temperature of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of second molds 24, 24 is (Tg-100) with respect to the glass transition point Tg [° C.] of the glass material to be pressure-molded. ) Set in the range of [° C.] to (Tg + 100) [° C.].
  • Tg glass transition point
  • Tg + 100 glass transition point
  • An appropriate temperature is determined in consideration of various conditions.
  • the heating temperature of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of second molds 24, 24 may be the same temperature or different temperatures.
  • the first mold 21, the auxiliary mold 22, the piston 23 and the pair of second molds 24, 24 are heated to a predetermined temperature and then melted in a high temperature state. Since the glass 50 is pressure-molded using the first mold 21 and the pair of second molds 24, 24, the first mold 21, the auxiliary mold 22, the piston 23, and the pair of second molds. A series of processes to be described later can be performed while keeping the temperature of the molds 24, 24 constant. Furthermore, a plurality of cover glasses can be sequentially manufactured while keeping the temperature of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of second molds 24, 24 constant. Therefore, since it is not necessary to repeat heating and cooling of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of second molds 24 and 24 every time the cover glass is manufactured, the efficiency is extremely short. A number of cover glasses can be manufactured well.
  • keeping the temperatures of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of second molds 24, 24 constant means that the first mold 21, the auxiliary mold 22, the piston 23, and the pair.
  • FIG. 6 is a diagram illustrating a process of arranging the first mold and the auxiliary mold at the dropping position.
  • the first mold 21 and the auxiliary mold 22 are moved and arranged at the dropping position P ⁇ b> 1 (see FIG. 3), and the auxiliary is placed above the first mold 21.
  • the molds 22 are arranged to face each other.
  • the movement of the first mold 21 and the auxiliary mold 22 is performed by the control unit 40 driving the first mold driving mechanism 25 and the auxiliary mold driving mechanism 26.
  • the first mold 21 is disposed such that the reservoir receiving surface 21a is positioned below the outflow pipe 13 of the material supply unit 10. Further, the auxiliary mold 22 has a piston moving passage 22e located above the reservoir receiving surface 21a of the first mold 21, and a pair of second mold moving passages 22f and 22f respectively corresponding thereto. The first mold 21 is positioned and arranged with respect to the first mold 21 so as to be positioned above the pair of first molding surfaces 21c and 21c.
  • FIG. 5 is a diagram showing a step of dropping molten glass
  • FIG. 8 is a diagram showing a step of receiving molten glass at a reservoir receiving portion.
  • the molten glass 50 continuously flows out vertically from the outlet of the outflow pipe 13, and the length of the molten glass 50 gradually increases in proportion to time. .
  • the molten glass 50 is cut by the cutter 14.
  • the separated molten glass 50 is dropped vertically downward (in the direction of arrow A shown in the figure).
  • the molten glass 50 is cut by the control unit 40 moving the cutter 14 using the cutter driving mechanism 15.
  • the dropped molten glass 50 then passes through the piston movement passage 22 e of the auxiliary mold 22 and is received by the reservoir receiving surface 21 a of the first mold 21. Thereby, the molten glass 50 is stored and received by the storage receiver 32.
  • FIG. 9 is a diagram illustrating a process of arranging the first mold and the auxiliary mold at the molding position.
  • the piston 23 and the pair of second molds are arranged to face each other below the molds 24 and 24.
  • the movement of the first mold 21 and the auxiliary mold 22 is performed by the control unit 40 driving the first mold driving mechanism 25 and the auxiliary mold driving mechanism 26.
  • the first mold 21 has a reservoir receiving surface 21a positioned below the piston 23, and a pair of first molding surfaces 21c and 21c positioned below the corresponding second mold 24, respectively.
  • the piston 23 and the pair of second molds 24, 24 are positioned and arranged.
  • the auxiliary mold 22 is arranged so that the relative positional relationship with the first mold 21 is maintained.
  • the piston movement passage 22e of the auxiliary mold 22 is disposed below the piston 23, and the pair of second mold movement passages 22f and 22f of the auxiliary mold 22 correspond to the corresponding second mold.
  • the first mold 21 and the auxiliary mold 22 are moved to the molding position P2 without delay.
  • FIG. 10 is a diagram illustrating an intermediate stage of the process of pressing the molten glass using the piston
  • FIG. 11 is a diagram illustrating an end stage of the process of pressing the molten glass using the piston.
  • the piston 23 vigorously moves vertically downward (in the direction of arrow B ⁇ b> 1 shown in the drawing) so as to approach the reservoir receiving portion 32 of the first mold 21. Moved.
  • the movement of the piston 23 is performed by the control unit 40 driving the piston drive mechanism 27.
  • the molten glass 50 is pressed by the piston 23, and the pressed molten glass 50 is ejected vigorously from the pair of extrusion channels 33 and 33 toward the outside.
  • piston 23 is lowered
  • the above operation is performed instantaneously in a shorter time in order to prevent the molten glass 50 from being hardened in the pressing chamber 31 or / and in the pair of extrusion flow paths 33.
  • the operation will be described in detail in stages.
  • the pressing surface 23a located at the lower end of the piston 23 comes into contact with the upper surface of the molten glass 50 stored in the reservoir receiving portion 32, whereby the molten glass 50 is It is pressed by the piston 23.
  • the pressing chamber 31 is filled with the molten glass 50, and a part of the molten glass 50 enters the pair of extrusion channels 33 and 33.
  • the inclined surfaces 21d and 21d having a shape in which the wall surface of the pressing chamber 31 adjacent to the pair of extrusion channels 33 and 33 is inclined toward the pair of extrusion channels 33 and 33 side. , 22d, 22d, the molten glass 50 is smoothly supplied from the pressing chamber 31 into the pair of extrusion channels 33, 33.
  • the piston 23 further moves downward in the vertical direction, so that the molten glass 50 supplied to the above-described pair of extrusion flow paths 33, 33 is extruded along the horizontal direction. It discharges toward the outside from the flow paths 33 and 33. Since the discharged molten glass 50 has a relatively high viscosity, the molten glass 50 does not immediately sag toward the pair of first molding surfaces 21c, 21c of the first mold 21, and advances in the horizontal direction to each of the pair of first molding surfaces 21c, 21c. The escape portions 35 and 35 are reached.
  • each of the pair of extrusion channels 33 and 33 has a slit-like opening, and therefore, the portion of the molten glass 50 discharged from the pair of extrusion channels 33 and 33. Is substantially plate-shaped. Therefore, by passing through the above steps, the portion of the molten glass 50 discharged from the pair of extrusion flow paths 33, 33 is in a state close to the shape of the cover glass as a glass molded product to be molded, and a pair of molded It is supplied between the first molding surface 21 c of the first mold 21 that is a mold part and the second molding surface 24 c of the second mold 24.
  • the molten glass 50 of the part discharged from the said pair of extrusion flow paths 33 and 33 moved to the exterior from the press chamber 31 by the flow resulting from the press by the piston 23, a temperature difference is compared. It is in a state that does not occur. Therefore, the temperature at the upper surface and the lower surface of the molten glass 50 in the discharged portion is in a state where they are kept substantially the same.
  • FIG. 12 is a diagram illustrating a process of pressure-forming molten glass.
  • the pair of second molds 24, 24 are vertically downward (in FIG. 11) so as to approach the pair of first molding surfaces 21c, 21c of the first mold 21, respectively. In the direction of arrow C1).
  • the movement of the pair of second molds 24, 24 is performed by the control unit 40 driving the pair of second mold drive mechanisms 28, 28.
  • the molten glass 50 of the part discharged from a pair of extrusion flow paths 33 and 33 each contacts the 2nd molding surface 24c of the 2nd metal mold
  • the state in which the molten glass 50 is pressurized by the first mold 21 and the pair of second molds 24 and 24 is maintained for a predetermined time.
  • the molten glass 50 is cured in a state where the shapes of the first molding surface 21c of the first mold 21 and the second molding surface 24c of the second mold 24 are transferred to the molten glass 50.
  • a glass molded body 60 (see FIG. 13 and the like) including the product region 61 and the non-product region 62 to be the cover glass is formed.
  • the temperature of the molten glass 50 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 point Tg [° C.].
  • Tg glass transition point
  • the temperature of the molten glass just before pressing may be 780 [° C.].
  • the temperature of the first mold 21 is set to 450 [° C.] or more and 550 [° C.] or less, and the temperature of the pair of second molds 24 and 24 is set to 450 respectively. It is good to set [C] or more and 550 [C] or less.
  • Tg is 540 [° C.]
  • the temperature of the first mold 21 may be set to 500 [° C.]
  • the temperature of the pair of second molds 24 and 24 may be set to 520 [° C.]. .
  • FIG. 13 is a diagram illustrating a process of releasing the pressing and pressing.
  • the piston 23 and the pair of second molds 24, 24 are vertically upward (in the directions of arrows B ⁇ b> 2 and C ⁇ b> 2 shown in the figure) so as to be separated from the first mold 21. It is moved toward. Thereby, the piston 23 and the pair of second dies 24, 24 are released from the glass molded body 60. The movement of the piston 23 and the pair of second molds 24, 24 is performed by the control unit 40 driving the piston drive mechanism 27 and the pair of second mold drive mechanisms 28, 28.
  • FIG. 14 is a diagram illustrating a process of taking out the glass molded body by taking out the first mold and the auxiliary mold at the take-out position.
  • the first mold 21 and the auxiliary mold 22 are moved to be taken out and placed at the take-out position P3 (see FIG. 3), and the auxiliary mold 22 is moved vertically upward (see FIG. 14). It is separated from the first mold 21 in the direction of arrow D shown in the figure. Thereby, the auxiliary mold 22 is released from the glass molded body 60. Furthermore, the glass molded body 60 is taken out by adsorbing the glass molded body 60 by an adsorption device (not shown) and releasing the glass molded body 60 from the first mold 21. The movement of the first mold 21 and the auxiliary mold 22 is performed by the control unit 40 driving the first mold driving mechanism 25 and the auxiliary mold driving mechanism 26.
  • FIG. 15A and FIG. 15B are a plan view and a cross-sectional view of a glass molded body showing a cutting position in a step of cutting and removing a non-product region of the glass molded body.
  • FIG. 15B shows a cross-sectional view of the glass molded body taken along line XVB-XVB shown in FIG. 15A.
  • the front surface and the back surface of the product region 61 of the glass molded body 60 after being taken out are both formed into a mirror surface or a state close thereto by the pressure molding described above. Therefore, it is sufficient to cut and remove the non-product region 62 from the glass molded body 60 as an additional process required after pressure molding.
  • the glass molded body 60 is cut along a cutting line E shown in the drawing so that a substantially box-shaped cover glass is obtained.
  • region 62 will be removed from the glass molded object 60, and two substantially box-shaped cover glasses will be obtained.
  • the portion adjacent to the pair of extrusion channels 33, 33 in the pair of cavities 34, 34 is the side plate portion of the cover glass as a glass molded product to be manufactured. Since it is configured to correspond to a portion that forms a non-product region continuously provided from an end located on the side opposite to the side on which the main plate portion is located, it is cut during the cutting process described above.
  • the part which becomes is an edge part located in the opposite side to the side in which the main board part of the side plate part of the manufactured cover glass is located. Therefore, not only the front and back surfaces of the main plate portion of the manufactured cover glass, but also the front and back surfaces of the side plate portions are mirror surfaces or surfaces that are close to that without being polished. It can be finished to the state.
  • the cover glass is manufactured using the glass molded product manufacturing method and the manufacturing apparatus 1 according to the present embodiment, so that the molten glass 50 received by the reservoir receiver 32 is slit-shaped.
  • the molten glass 50 can be made to have a substantially plate-like shape close to the shape of the cover glass to be manufactured.
  • the formed molten glass 50 can be pressure-formed from both sides along the thickness direction. Therefore, the shape of the molten glass 50 can be instantly determined as the shape of the cover glass to be manufactured in a short time from the dropping of the molten glass 50 to the curing of the molten glass 50. Therefore, it is possible not only to efficiently produce a thin cover glass with excellent moldability, but also to improve transferability at the corners.
  • the portion of the molten glass 50 extruded from the extrusion flow path 33 including the slit-shaped opening is formed. Since a relatively large temperature difference does not occur, in the subsequent pressure forming step, the upper surface and the lower surface, which are portions that contact the first molding surface 21c and the second molding surface 24c, of the molten glass 50 are used. It becomes possible to go through substantially the same cooling process. Therefore, also from this viewpoint, it becomes possible to efficiently produce a thin cover glass with excellent moldability.
  • the cover glass is manufactured using the manufacturing method and the manufacturing apparatus 1 of the glass molded product in the present embodiment, compared to the case where the molten glass dropped is sandwiched in the horizontal direction and pressed. Since various production conditions can be made relatively easy to match, the quality of the produced cover glass does not vary greatly, and the cover glass can be produced with good yield.
  • the reservoir receiving surface, the first flow path forming surface, and the first forming surface are used as members for pressure forming molten glass.
  • the various surfaces may be defined by more members.
  • the first mold described above may be divided into a member including a reservoir receiving surface and a first flow path forming surface, and a member including a first molding surface, and the former of these may be used as a reservoir receiver. You may divide
  • the extruding direction when extruding the molten glass from the extruding flow path is the horizontal direction, and the sandwiching direction when the molten glass is pressure-molded using a pair of forming mold parts
  • the extruding direction when extruding the molten glass from the extruding flow path is vertically downward, and the sandwiching direction when the molten glass is pressure-formed using a pair of forming mold parts is horizontal.
  • the wall surface of the pressing chamber in the portion adjacent to the pair of extrusion channels is configured by an inclined surface having a shape inclined toward the pair of extrusion channels.
  • the wall surface may be configured by a curved surface having a shape that curves toward the pair of extruded flow paths.
  • the cover glass with which a smart phone and a tablet terminal were equipped was demonstrated as a glass molded product manufactured by applying this invention,
  • 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, and various lenses.
  • the present invention may also be applied to the manufacture of optical recording media.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

Ce procédé de fabrication d'articles en verre moulé comprend : une étape de réception et d'accumulation, dans un réservoir de réception (32), de verre fondu (50) qui est versé goutte à goutte dans le réservoir de réception (32) ; une étape d'expulsion du verre fondu (50) depuis un canal d'extrusion (33) qui comprend une ouverture en forme de fente vers l'extérieur du réservoir de réception (32) en poussant le verre fondu (50) accumulé dans le réservoir de réception (32) à l'aide d'un piston (23) ; et une étape de moulage sous pression du verre fondu (50) qui est modelé sous une forme essentiellement plate en l'expulsant du canal d'extrusion (33) en le prenant en sandwich à l'aide d'un moule des deux côtés dans la direction de l'épaisseur du verre.
PCT/JP2014/062233 2013-06-18 2014-05-07 Procédé de fabrication d'articles en verre moulé et dispositif de fabrication WO2014203636A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-127289 2013-06-18
JP2013127289 2013-06-18

Publications (1)

Publication Number Publication Date
WO2014203636A1 true WO2014203636A1 (fr) 2014-12-24

Family

ID=52104379

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/062233 WO2014203636A1 (fr) 2013-06-18 2014-05-07 Procédé de fabrication d'articles en verre moulé et dispositif de fabrication

Country Status (1)

Country Link
WO (1) WO2014203636A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111094195A (zh) * 2018-04-17 2020-05-01 冈本硝子株式会社 玻璃制光学零件成形用模具及使用该模具的玻璃制光学零件的制造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05178631A (ja) * 1991-12-27 1993-07-20 Olympus Optical Co Ltd 光学素子の成形方法
JPH08245225A (ja) * 1995-03-10 1996-09-24 Olympus Optical Co Ltd 光学素子の成形装置
JPH11189426A (ja) * 1991-11-27 1999-07-13 Olympus Optical Co Ltd 光学素子の成形方法及び光学素子
JP2013234091A (ja) * 2012-05-09 2013-11-21 Konica Minolta Inc ガラス板の製造方法及び製造装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11189426A (ja) * 1991-11-27 1999-07-13 Olympus Optical Co Ltd 光学素子の成形方法及び光学素子
JPH05178631A (ja) * 1991-12-27 1993-07-20 Olympus Optical Co Ltd 光学素子の成形方法
JPH08245225A (ja) * 1995-03-10 1996-09-24 Olympus Optical Co Ltd 光学素子の成形装置
JP2013234091A (ja) * 2012-05-09 2013-11-21 Konica Minolta Inc ガラス板の製造方法及び製造装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111094195A (zh) * 2018-04-17 2020-05-01 冈本硝子株式会社 玻璃制光学零件成形用模具及使用该模具的玻璃制光学零件的制造方法
EP3686164A4 (fr) * 2018-04-17 2020-10-28 Okamoto Glass Co., Ltd. Moule de moulage de composant optique en verre, et procédé de fabrication de composant optique en verre utilisant ledit moule
US20200339463A1 (en) * 2018-04-17 2020-10-29 Okamoto Glass Co., Ltd. Mold for molding glass-made optical component and method for manufucturing glass-made optical component using mold
CN111094195B (zh) * 2018-04-17 2022-06-24 冈本硝子株式会社 玻璃制光学零件成形用模具及使用该模具的玻璃制光学零件的制造方法

Similar Documents

Publication Publication Date Title
CN103803779A (zh) 手机用防护玻璃罩成型装置与成型用模具
JP2014091655A (ja) ガラス成形品の製造方法および製造装置
CN109250895A (zh) 光学玻璃非球面透镜成型制造方法及其模具
WO2014203636A1 (fr) Procédé de fabrication d'articles en verre moulé et dispositif de fabrication
JP6374951B2 (ja) 光学素子成形用型セット、及び、光学素子の製造方法
JPH0471853B2 (fr)
CN111094195A (zh) 玻璃制光学零件成形用模具及使用该模具的玻璃制光学零件的制造方法
JPH01148717A (ja) 光学素子の成形装置
JP5638990B2 (ja) ガラス光学素子の製造方法
WO2015118663A1 (fr) Procédé et dispositif de fabrication d'un article moulé en verre
JP2000095532A (ja) プレス成形光学素子とその製造方法と光学素子プレス成形用型および光学素子プレス成形装置
WO2013191096A1 (fr) Procédé de production et dispositif de production pour un produit formé en verre
JP2014234320A (ja) ガラス成形品の製造方法およびガラス成形品の製造装置
WO2015151178A1 (fr) Procédé de fabrication et dispositif de fabrication pour un article moulé en verre
JPH01164738A (ja) 光学素子の成形装置
JP2006089313A (ja) 可塑性素材の成形方法
WO2015111183A1 (fr) Procédé de fabrication d'article en verre moulé, article en verre moulé et dispositif de fabrication d'un article en verre moulé
JP4666679B2 (ja) モールドプレス成形装置、及び成形体の製造方法
JP2014094849A (ja) ガラス成形品の製造方法および製造装置
JP2015202974A (ja) ガラス成形品の製造方法およびガラス成形品の製造装置
JP2014094848A (ja) ガラス成形品の製造方法および製造装置
WO2014199702A1 (fr) Procédé pour la fabrication d'article en verre moulé et dispositif pour la fabrication d'article en verre moulé
WO2015111180A1 (fr) Procédé et dispositif de fabrication d'un article moulé en verre
JP2014227315A (ja) ガラス成形品の製造方法および製造装置
JP2015101505A (ja) ガラス成形品の製造方法および製造装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14813891

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: JP

122 Ep: pct application non-entry in european phase

Ref document number: 14813891

Country of ref document: EP

Kind code of ref document: A1