WO2015111180A1 - Method and device for manufacturing glass molded article - Google Patents

Abstract

　A method for manufacturing a glass molded article is provided with: a step for preparing an upper die (61) and a lower die (62); a step for supplying a molten glass raw material to the lower die (62); a step for compression-molding the glass raw material, supplied to the lower die (62), through use of the upper die (61) and the lower die (62); a step for separating the upper die (61) from a glass molded article formed by compression molding of the glass raw material by the upper die (61) and the lower die (62), by moving the upper die (61) upward; a step for separating the lower die (62) from the glass molded article using a separation mold (63) within one second of separating the upper die (61) from the glass molded article; and a step for retaining the glass molded article separated from the lower die (62) so that the glass molded article is exposed to the atmosphere.

Description

Manufacturing method and manufacturing apparatus for glass molded product

The present invention relates to a manufacturing method and a manufacturing apparatus for a glass molded product, and particularly to a manufacturing method and a manufacturing apparatus for a glass molded product integrally formed by a direct press method.

Cover glasses provided in display devices such as smartphones and tablet terminals are widely used. In the cover glass, from the viewpoint of design and operability, a complicated 3D (three dimension) shape having a curved periphery and an opening penetrating in the thickness direction are required.

Such a cover glass having a complicated shape or opening can be manufactured by cutting a plate-like glass material formed by a float process and then performing grinding or polishing treatment. However, microcracks are easily formed on the surface and opening of the cover glass by grinding or polishing treatment. For this reason, when a stress is applied to the cover glass from the outside, the microcrack develops to generate chipping, and the cover glass breaks due to the chipping. Further, performing grinding or polishing treatment to obtain a predetermined shape from the glass material once formed becomes a factor for reducing the production efficiency and a factor for increasing the manufacturing cost.

Therefore, in recent years, from the viewpoint of simplifying the manufacturing process, instead of the method of cutting out from a plate-like glass material, a direct press method that directly forms a molten glass material using a mold including an upper mold and a lower mold is adopted. Has been.

In this direct press method, a glass molded product is manufactured by pressure-molding a molten glass material. However, when the upper mold rises and separates from the glass molded product after pressure molding, the temperature of the glass molded product rapidly decreases. In addition, after the upper mold is raised, the glass molded product is placed on the lower mold, so that the media in which the upper surface and the lower surface of the glass molded product are in contact with each other are different. For this reason, a temperature gradient is remarkably generated from the upper surface to the lower surface of the glass molded product. As a result, warpage occurs in the glass molded product. In particular, when a thin glass molded product is molded, warpage is more likely to occur.

As a method for producing a glass molded product for reducing the warpage of the glass molded product in this way, for example, the production disclosed in Japanese Patent Application Laid-Open No. 10-236831 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2010-105874 (Patent Document 2). There is a way.

Patent Document 1 discloses a method for manufacturing a book-plate-like glass molded product in which a glass material melted between a lower mold and an upper mold is pressure-molded. A first pressurizing step of pressing the glass material melted by the upper mold and the lower mold held at a predetermined temperature so that the temperature is higher than the glass transition temperature, and then the pressure-molded glass In order to correct the warping of the material, a manufacturing method is disclosed that includes a second pressurizing step of pressurizing the glass material that has been press-molded again.

Patent Document 2 discloses a method for producing a thin glass-molded product in which a glass material melted using an upper mold and a lower mold is pressure-molded, and when the glass transition temperature is Tg (° C.), A step of pressure-molding the molten glass material so that the temperature of the pressure-molded glass molded product becomes Tg−20 (° C.) or more and less than Tg (° C.) within 0.8 seconds after the pressurization is completed. A manufacturing method is provided.

Japanese Patent Laid-Open No. 10-236831 JP 2010-105874 A

However, in the manufacturing method disclosed in Patent Document 1, the upper mold is raised and separated from the glass molded article, and then another mold is brought into contact with the glass molded article. There is a concern that the shape of the upper surface of the product will collapse and new defects will be formed. In addition, there is a concern that productivity may be reduced because a second pressure forming step for correcting the warpage is required.

In the manufacturing method disclosed in Patent Document 2, since the upper surface of the glass molded product and the lower surface are in contact with each other after the upper mold is raised and separated from the glass molded product, the upper surface of the glass molded product is different. A temperature gradient is created across the bottom surface. Therefore, there is a concern that a large warp occurs in the glass molded product due to this temperature gradient.

Furthermore, in the method for producing a 3D-shaped glass molded product having a main surface portion and a side surface portion, there are differences in the degree of transferability, separation property, and heat shrinkage between the main surface portion and the side surface portion. It is difficult to apply a method for manufacturing a book-plate-shaped glass molded article using a flat mold as disclosed in Document 2 to a method for manufacturing a 3D-shaped glass molded article.

In addition, when using a manufacturing method in which the upper mold is raised and separated from the glass molded product after pressure treatment is performed to a temperature at which no warpage occurs, the surface of the glass molded product that contacts the mold and the mold are used. There may be a difference in the degree of thermal shrinkage between the inside of the glass molded product that does not come into contact, and an excessive stress may be applied to the glass molded product. Thereby, there is a concern that cracks are likely to occur particularly in a 3D-shaped glass molded product in which a difference in the degree of thermal shrinkage tends to occur between the main surface portion and the side surface portion.

Accordingly, the present invention has been made in view of the above-described problems, and its object is to provide a glass molded product manufacturing method and a manufacturing apparatus that are excellent in mass productivity and can suppress warpage of the glass molded product. Is to provide.

The method for producing a glass molded product according to the present invention includes a step of preparing an upper die and a lower die, a step of supplying a molten glass material to the lower die, and the glass material supplied to the lower die. Formed by pressure-molding the glass material with the upper mold and the lower mold by moving at least one of the upper mold and the lower mold with a step of pressure-molding with the mold and the lower mold Separating the upper mold from the glass molded article, separating the glass molded article from the lower mold using a separating means within 1 second after separating the upper mold from the glass molded article, And holding the glass molded product so that the glass molded product separated from the lower mold is exposed to the atmosphere.

A glass molded product refers to a molten glass material that has been molded into a certain shape by being pressed by an upper mold and a lower mold for a predetermined time, and is subjected to post-processing after pressure molding. Is also included in the glass molded product. The manufacturing method of the glass molded product based on this invention shall include the case where a post-process is further given with respect to the glass molded product formed by press-molding.

An apparatus for producing a glass molded product according to the present invention includes an upper mold and a lower mold for press-molding a molten glass material, and glass formed by press-molding the glass material with the upper mold and the lower mold. Separation means for separating the molded product from the lower mold, a first drive unit for moving the upper mold, a second drive unit for moving the lower mold, a third drive unit for moving the separation means, and A control unit that controls operations of the first drive unit, the second drive unit, and the third drive unit. The control unit separates the upper mold from the glass molded article by moving at least one of the upper mold and the lower mold, and within one second after separating the upper mold from the glass molded article. The glass molded article is separated from the lower mold using a separating means, and the glass molded article is exposed to the atmosphere by holding the glass molded article separated from the lower mold. The operations of the first drive unit, the second drive unit, and the third drive unit are controlled so as to be held.

According to the present invention, it is possible to provide a method and apparatus for producing a glass molded product that is excellent in mass productivity and capable of suppressing warpage of the glass molded product.

It is a perspective view of the state which disassembled partially the display apparatus provided with the cover glass manufactured according to the manufacturing method of the glass molded product which concerns on Embodiment 1 of this invention. 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 1 of this invention. FIG. 4 is a schematic cross-sectional view of the molding die shown in FIG. 3. FIG. 4 is a top view of the lower mold and the separation mold shown in FIG. 3. It is a flowchart which shows the manufacturing method of the glass molded product which concerns on Embodiment 1 of this invention. It is a schematic cross section which shows the process of cutting a glass raw material shown in FIG. It is a schematic cross section which shows the process of dripping the glass raw material shown in FIG. 6 to a lower mold | type. FIG. 7 is a schematic cross-sectional view showing a step of lowering the upper mold and approaching the lower mold shown in FIG. 6. It is a schematic cross section which shows the process of pressure-molding the glass raw material fuse | melted with the metal mold | die shown in FIG. FIG. 7 is a schematic cross-sectional view showing a step of moving up and moving the upper mold shown in FIG. 6. It is a schematic cross section which shows the process shown in FIG. 6 which isolate | separates and hold | maintains a glass molded product from a lower mold | type. It is a schematic cross section which shows the process of grind | polishing the glass molded product taken out from the metal mold | die shown in FIG. It is a schematic cross section which shows the glass molded product shown in FIG. 6 after completion | finish of a grinding | polishing process. It is the schematic which shows the structure of the manufacturing apparatus of the glass molded product which concerns on Embodiment 2 of this invention. FIG. 16 is a schematic cross-sectional view of the molding die and the clamp mechanism shown in FIG. 15. FIG. 16 is a top view of the upper mold and the clamp mechanism shown in FIG. 15. It is a flowchart which shows the manufacturing method of the glass molded product which concerns on Embodiment 2 of this invention. FIG. 19 is a schematic cross-sectional view showing a step of lowering the upper mold and approaching the lower mold shown in FIG. 18. It is a schematic cross section which shows the process of pressure-molding the glass raw material fuse | melted with the metal mold | die shown in FIG. FIG. 19 is a schematic cross-sectional view illustrating a step of moving up and moving the upper mold illustrated in FIG. 18. It is a schematic cross section which shows the 1st process of the process shown in FIG. 18, which isolate | separates and hold | maintains a glass molded product from a lower mold | type. It is a schematic cross section which shows the 2nd process of the process shown in FIG. 18, which isolate | separates and hold | maintains a glass molded product from a lower mold | type. It is a figure which shows the state in which the clamp mechanism is holding the glass molded product in the 2nd process shown in FIG. It is a figure which shows the example of an experiment conducted regarding embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In embodiment shown below, the cover glass with which a smart phone is comprised is illustrated and demonstrated as a glass molded article. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a perspective view showing a state in which a display device including a cover glass manufactured according to the method for manufacturing a glass molded article according to Embodiment 1 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.

As shown in FIG. 1, the display device 100 includes a cover glass 10, a flat plate-shaped exterior plate 20, a circuit board 30 disposed on the exterior plate 20, and a speaker mounted on the circuit board 30. 31 and a display 40 mounted on the circuit board 30. 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, the speaker 31, 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, and includes an opening 10 </ b> H provided so as to correspond to the speaker 31. Opening 10H penetrates in the thickness direction from one main surface side of cover glass 10 toward the other main surface side.

As shown in FIG. 2, the cover glass 10 has a main surface portion 13, a connection portion 14, and a side surface portion 15. The cover glass 10 has a front surface 11 and a back surface 12, and the front surface 11 of the cover glass 10 includes a front surface of the main surface portion 13, a front surface of the connection portion 14, and a side surface. It consists of the front surface of the part 15. Further, the back surface 12 of the cover glass 10 includes a back surface of the main surface portion 13, a back surface of the connection portion 14, and a back surface of the side surface portion 15.

The main surface portion 13 has a substantially flat plate shape. In a state where the cover glass 10 is attached to the display 40, the front surface side of the main surface portion 13 is mainly exposed to the outside. The connection part 14 and the side part 15 have an annular shape as a whole. The connecting portion 14 is connected to the outer edge of the main surface portion 13 and is curved in a direction away from the front surface of the main surface portion 13 as it goes outward from the outer edge of the main surface portion 13. The side surface portion 15 is connected to the outer edge of the connecting portion 14 and extends in a direction away from the front surface of the main surface portion 13 as it goes outward from the outer edge of the main surface portion 13. Thereby, the outer edge of the corner | angular part in the front surface of the main surface part 13 becomes a rounded shape, and the cover glass 10 becomes 3D shape in the connection part 14 as it goes to the side surface part 15 side from the main surface part 13 side. Molded to hold and curve.

The side surface portion 15 may be formed in a flat plate shape as shown in the figure, and, like the connection portion 14, from the outer surface of the main surface portion 13 toward the outside, from the front surface of the main surface portion 13. You may shape | mold in the curved plate shape curved in the direction to go away. Further, the side surface portion 15 is not necessarily provided in an annular shape on the entire circumference of the main surface portion 13, but only on a part of the outer edge of the main surface portion 13 (for example, a pair of opposing sides of the main surface portion 13 having a substantially rectangular shape in plan view). (Only), the structure provided with the side part 15 may be sufficient.

In the display device 100, the main surface portion 13 receives light L (see FIG. 2) containing predetermined image information from the back surface 12 side located on the image display portion 42 side of the cover glass 10 toward the front surface 11 side. Transparent. Thereby, the various image information displayed on the image display part 42 is recognized by the user. When the front surface 11 of the cover glass 10 constitutes a touch panel display surface, the front surface 11 is pressed by a user's finger or a pen or the like.

The cover glass 10 as described above has a glass composition of 50 to 70% by weight of SiO ₂ , 5 to 15% by weight of Al ₂ O ₃ , and 0 to 5% by weight. B ₂ O ₃ , 2 wt% to 20 wt% Na ₂ O, 0 wt% to 10 wt% K ₂ O, 0 wt% to 10 wt% MgO, 0 wt% or more 10% by weight or less of CaO, 0% by weight to 5% by weight of BaO, 0% by weight to 5% by weight of TiO ₂ , and 0% by weight to 15% by weight of ZrO ₂ Good.

When the glass transition temperature is Tg, the glass having such a composition greatly affects the shape transferred to the glass by pressure molding (Tg-30) [° C] or more (Tg + 150) [° C] or less. In this temperature range, it is possible to maintain an appropriate glass viscosity, complete the surface transfer in a state in which good transferability is ensured, and suppress cracking due to thermal shrinkage of the glass.

The linear expansion coefficient α of the glass is desirably 70 to 110 [× 10 ⁻⁷ / ° C.] in the temperature range of 100 [° C.] to 300 [° C.]. For example, a glass having a linear expansion coefficient α of 98 [× 10 ⁻⁷ / ° C.] in the range of 100 ° C. to 300 ° C. may be used. Further, when the glass viscosity is η [dPa · s], log η = 11.0 to 14.5 is desirable. Glass having the above characteristics is suitable for forming a cover glass having a curved shape.

The cover glass 10 as described above is manufactured using a direct press method. FIG. 3 is a schematic diagram illustrating a configuration of a glass molded product manufacturing apparatus according to the first embodiment. With reference to FIG. 3, the manufacturing apparatus 50 of the glass molded product which concerns on Embodiment 1 is demonstrated.

As shown in FIG. 3, the glass molded product manufacturing apparatus 50 includes a continuous melting furnace 71 that stores a molten glass material 10 </ b> D, and a nozzle 73 that is connected to a lower portion of the continuous melting furnace 71. The continuous melting furnace 71 and the nozzle 73 constitute a material supply unit 70 for supplying the molten glass material 10 </ b> D to the lower mold 62.

The manufacturing apparatus 50 includes a glass cutter 64 that cuts the glass material 10 </ b> D flowing out from the nozzle 73. The glass cutter 64 is driven by an air cylinder 84, for example, and appropriately cuts the glass material 10D to divide it into an appropriate amount.

The manufacturing apparatus 50 pressurizes the glass material 10D together with the lower mold 62 for receiving the glass material that is cut and dropped by the glass cutter 64, the separation mold 63 as the separating means, and the lower mold 62 and the separation mold 63. And an upper die 61 to be molded. The lower mold 62, the separation mold 63, and the upper mold 61 constitute a molding mold 60 for press-molding a glass molded product 10F described later.

The manufacturing apparatus 50 includes a control unit 90. The control unit 90 controls operations of the servo motor 81 as the first drive unit, the servo motor 82 as the second drive unit, the servo motor 83 as the third drive unit, and the air cylinder 84 described above. The control unit 90 controls a series of sequences relating to the manufacture of the glass molded product, such as the timing of cutting the glass material 10D by the air cylinder 84, the timing of movement of the lower mold 62, the separation mold 63, and the upper mold 61.

The servo motor 81 receives a command from the control unit 90, moves the upper die 61 in the DR1 direction (pressurizing direction) shown in FIG. 3, and brings the upper die 61, the lower die 62, and the separation die 63 closer to each other. And separate. The servo motor 82 receives a command from the control unit 90 and reciprocates the lower mold 62 in the DR2 direction (direction perpendicular to the pressurizing direction) shown in FIG. The servo motor 83 receives a command from the control unit 90 and reciprocates the separation mold 63 in the DR1 direction.

The servo motor 82 that moves the lower mold 62 and the servo motor 83 that moves the separation mold 63 are controlled independently. Thereby, the lower mold 62 and the separation mold 63 can be operated differently. For example, in a state where the lower mold 62 is stopped, the separation mold 63 can be raised toward the upper mold 61, and the separation mold 63 can be lowered from the raised position toward the lower mold 62.

The lower mold 62 is received by the servo motor 82 at a position for receiving the glass material below the nozzle 73 (glass dropping position P1), and a position for pressing the glass material to face the upper mold 61 (forming position). P2) and a position (extraction position P3) for taking out the glass molded product from the lower mold 62 are configured to be movable.

As a method of controlling the servo motor 81 by the control unit 90, there are a mode for controlling the position of the upper mold 61 (position control mode) and a mode for controlling the load applied to the upper mold 61 (load control mode). . It is preferable that these two control modes can be switched. The servo motor 81 is provided in a specification capable of press-molding a glass material with a pressing force of up to 3 tons.

In the present embodiment, the first drive unit, the second drive unit, and the third drive unit that drive the upper mold 61, the lower mold 62, and the separation mold 63 are limited to the servo motors 81, 82, and 83. Instead, known driving means such as an air cylinder, a hydraulic cylinder, a linear motor, and a stepping motor can be appropriately selected and used.

The materials of the upper mold 61, the lower mold 62, and the separation mold 63 are made of a heat-resistant alloy (such as stainless steel), a super steel material mainly composed of tungsten carbide, various ceramics (such as silicon carbide, silicon nitride, and aluminum nitride), and carbon. It can be used by appropriately selecting from known materials as a molding die for producing a glass molded article such as a composite material. The upper mold 61, the lower mold 62, and the separation mold 63 may be made of the same material, or may be made of different materials.

It is also preferable to provide a coating layer on the surfaces of the upper mold 61, the lower mold 62, and the separation mold 63 to improve durability and prevent fusion with a glass material. There are no particular restrictions on the material of the coating layer. For example, various metals (chromium, aluminum, titanium, etc.), nitrides (chromium nitride, aluminum nitride, titanium nitride, boron nitride, etc.), oxides (chromium oxide, aluminum oxide, For example, titanium oxide can be used. The method for forming the coating layer is not limited and may be appropriately selected from known film forming methods. For example, vacuum deposition, sputtering, CVD and the like can be mentioned.

The upper mold 61, the lower mold 62 and the separation mold 63 are configured to be heated to a predetermined temperature by a heating means (not shown). As the heating means, known heating means can be appropriately selected and used. For example, 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.

FIG. 4 is a schematic cross-sectional view of the molding die shown in FIG. FIG. 5 is a top view of the lower mold and the separation mold shown in FIG. With reference to FIG. 4 and FIG. 5, the upper mold | type 61, the lower mold | type 62, and the separation mold 63 which comprise the metal mold | die 60 for shaping | molding are demonstrated.

As shown in FIG. 4, when the upper mold 61, the lower mold 62, and the separation mold 63 are close to each other, a cavity 66 is formed between the upper mold 61, the lower mold 62, and the separation mold 63. The cavity 66 is a portion corresponding to a portion to be a product planned region 16 (see FIG. 11) of a glass molded product to be described later, and a preliminary region 17 (see FIG. 11) of a glass molded product to be described later. And a second cavity portion 68 which is a portion corresponding to the portion to be formed. The planned product area 16 is an area corresponding to the main surface portion 13, the connection portion 14, and the side surface portion 15 of the cover glass 10 described above. The spare area 17 is an area that is located around the planned product area 16 and is cut and removed in a glass molded product manufacturing process described later.

The upper mold 61 has a mold surface 61 a that defines the upper surface of the first cavity portion 67 and a mold surface 61 b that defines the upper surface of the second cavity portion 68. The lower mold 62 has a first pressure surface 62 a that defines the lower surface of the first cavity portion 67 and a second pressure surface 62 b that defines a part of the lower surface of the second cavity portion 68. Further, the lower mold 62 has an accommodation space 65 in which the separation mold 63 can be accommodated. The separation mold 63 has a substantially cylindrical shape and has an upper surface 63a. The separation mold 63 is housed in the housing space 65 so that the upper surface 63a is flush with the second pressure surface 62b of the lower mold 62. Thereby, the upper surface 63 a of the separation mold 63 defines the lower surface of the second cavity portion 68 together with the second pressure surface 62 b of the lower mold 62. The upper surfaces of the first cavity portion 67 and the second cavity portion 68 correspond to the back surface 12 side of the cover glass 10, and the lower surfaces of the first cavity portion 67 and the second cavity portion 68 are the main surfaces of the cover glass 10. This corresponds to the surface 11 side.

4 and 5, in the lower mold 62, the second pressure surface 62b is provided continuously from the outer edge of the first pressure surface 62a and extends in a direction perpendicular to the pressure direction (DR1 direction). The end of the second pressure surface 62b coincides with the end of the spare area 17 indicated by a two-dot chain line. The separation mold 63 is disposed outside the first pressure surface 62a and inside the end portion of the second pressure surface 62b. Further, the pair of separation molds 63 are arranged so as to face each other so that the first pressure surface 62a is positioned therebetween when viewed along the pressure direction. Further, the pair of separation molds 63 are provided at substantially the center of the long side and the short side of the lower mold 62, respectively. Thereby, in the manufacturing process described later, the separation mold 63 can stably hold the glass molded product 10F by rising from the second pressure surface 62b and supporting the preliminary region 17 (see FIG. 12). .

Note that the number of separation molds 63 is not limited to four, and may be two or more as long as the preliminary region 17 can be supported and the glass molded product can be stably held. Four separation molds 63 may be provided at the four corners of the second pressure surface 62b. Furthermore, the shape of the separation mold 63 is not limited to a cylindrical shape, and may be a flat plate shape. In this case, the pair of plate-shaped separation molds 63 may be provided along the long side or the short side of the lower mold 62.

FIG. 6 is a flowchart showing a method for manufacturing a glass molded product according to the present embodiment. Each of FIG. 7 to FIG. 14 is a schematic cross-sectional view showing a predetermined step of the steps shown in FIG. With reference to FIGS. 6 to 14, a method for manufacturing a glass molded product according to the present embodiment will be described.

As shown in FIG. 6, first, in a step (S11), a molding die 60 including an upper die 61, a lower die 62, and a separation die 63 is prepared. At this time, the upper mold 61, the lower mold 62, and the separation mold 63 are each heated to a predetermined temperature. The predetermined temperature may be a temperature at which a good transfer surface can be formed on a glass molded product.

Generally, when the temperature of the molding die 60 is too low, it becomes difficult to mold a highly accurate transfer surface. On the other hand, if the temperature is too high as necessary, there is a concern that fusion with glass is likely to occur, or the life of the molding die 60 is shortened. Usually, the temperature 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. Actually, 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 molding die 60, and the type of protective film. The heating temperature of the upper mold 61, the lower mold 62, and the separation mold 63 may be the same temperature or different temperatures.

In the present embodiment, after the molding die 60 is heated to a predetermined temperature, the hot glass material 10E in a molten state is supplied and subjected to pressure molding, so that the temperature of the molding die 60 is kept constant. A series of steps can be performed as it is. Furthermore, it is possible to repeatedly manufacture a plurality of glass molded products while keeping the temperature of the molding die 60 constant. Therefore, since it is not necessary to repeat the temperature rise and cooling of the molding die 60 every time one glass molded product is manufactured, the glass molded product can be manufactured efficiently in an extremely short time. Here, keeping the temperature of the molding die 60 constant means that the target set temperature in the temperature control for heating the molding die 60 is kept constant. Therefore, it is not intended to prevent temperature variation of the molding die 60 due to contact with the glass material 10E during each process, and such temperature variation is allowed.

Next, as shown in FIG. 6, in the step (S12), the lower mold 62 is placed at the glass dropping position P1 (see FIG. 3). As a result of detecting the current position of the lower mold 62, when the lower mold 62 is disposed at the glass dropping position P1, the lower mold 62 is not moved. On the other hand, as a result of detecting the current position of the lower mold 62, when the lower mold 62 is arranged at a position other than the glass dropping position P1, the servo motor 82 is activated by a command from the control unit 90, and the lower mold 62 is activated. Moves to the glass dropping position P1.

Next, as shown in FIG. 6, in the step (S13), the glass material 10D (see FIG. 3) is cut. FIG. 7 is a schematic cross-sectional view showing a step of cutting the glass material shown in FIG. The glass material 10D stored in the continuous melting furnace 71 in the melted state flows out of the continuous melting furnace 71 via the nozzle 73 and falls from the nozzle 73 into a liquid line shape by its own weight. As shown in FIG. 7, the glass material 10D flowing out from the nozzle 73 is cut by a glass cutter 64, and a glass material 10E having a drop-like shape is obtained. The glass material 10E falls toward the lower mold 62.

Next, as shown in FIG. 6, in the step (S14), the molten high-temperature glass material 10E is dropped onto the lower mold 62. FIG. 8 is a schematic cross-sectional view showing the step of dropping the glass material onto the lower mold shown in FIG. As shown in FIG. 8, the glass material 10 </ b> E that is cut and dropped by the glass cutter 64 is stored on the lower mold 62. The glass material 10 </ b> E supplied on the lower mold 62 spreads wet on the lower mold 62. The glass material 10E is preferably dropped on the horizontal plane of the first pressure surface 62a, avoiding the second pressure surface 62b. The temperature of the glass material 10E dropped on the lower mold 62 may be in the range of 800 ° C. or more and 900 ° C. or less, for example.

Next, as shown in FIG. 6, in the step (S15), the lower mold 62 is moved to the molding position P2 (see FIG. 3). The servo motor 82 is activated by a command from the control unit 90, and the lower mold 62 moves in the horizontal direction (DR2 direction shown in FIG. 4). As a result, the lower die 62 moves from the glass dropping position P1 below the nozzle 73 to the molding position P2 below the upper die 61. The molding surface (first pressure surface 62a, second pressure surface 62b) of the lower mold 62 moved to the molding position P2, the upper surface 63a of the separation mold 63, and the molding surface of the upper mold 61 (mold surface 61a, mold surface 61b). Are opposed to each other.

Next, as shown in FIG. 6, in the step (S16), the upper mold 61 moves downward. FIG. 9 is a schematic cross-sectional view showing the step of lowering the upper mold and approaching the lower mold shown in FIG. As shown in FIG. 9, the servo motor 81 is activated by a command from the control unit 90, and the upper die 61 is lowered toward the lower die 62 as indicated by an arrow. Thereby, the upper mold | type 61, the lower mold | type 62, and the isolation | separation metal mold | die 63 approach. When the upper mold 61 continues to move downward from the state shown in FIG. 9, the mold surface 61a of the upper mold 61 comes into contact with the glass material 10E. Thereby, the glass material 10E is spread from the first pressure surface 62a side toward the second pressure surface 62b side. The glass material 10E that has been spread out is filled in the first cavity portion 67 and the second cavity portion 68 (see FIG. 10).

Next, as shown in FIG. 6, in step (S <b> 17), the glass material 10 </ b> E is pressure-molded by the upper mold 61, the lower mold 62, and the separation mold 63. FIG. 10 is a schematic cross-sectional view showing a step of pressure-forming the glass material melted by the molding die shown in FIG. As shown in FIG. 10, the glass material 10 </ b> E includes the molding surface of the upper mold 61 (mold surface 61 a and mold surface 61 b), the molding surface of the lower mold 62 (first pressurization surface 62 a and second pressurization surface 62 b), and separation metal. By being sandwiched between the upper surfaces 63a of the molds 63, pressure molding is performed.

The temperature of the glass material 10E at the start of pressure molding is preferably set to (Tg + 50) ° C. or higher and (Tg + 200) ° C. or lower. For example, when Tg is 540 ° C., the temperature of the glass material 10E immediately before pressing may be 680 ° C. The temperature of the glass material 10E can be measured by, for example, a radiation thermometer. In order to obtain such a temperature setting, the glass transition temperature is set to Tg, the temperature of the upper mold 61 is set to (Tg-60) ° C. or more and (Tg-20) ° C. or less, and the temperature of the lower mold 62 is set to ( Tg-80) ° C. or more and (Tg-10) ° C. or less may be set. For example, when Tg is 540 ° C., the temperature of the upper die 61 may be 500 ° C., and the temperature of the lower die 62 may be 520 ° C. In pressurization, for example, a pressure of about 2 tons is applied to the glass material 10E for about 10 seconds. Thereby, the glass raw material 10E is pressure-molded, and the glass molded product 10F is formed.

Next, as shown in FIG. 6, in the step (S18), the upper die 61 is moved up. FIG. 11 is a schematic cross-sectional view showing a step of moving the upper mold up and down shown in FIG. As shown in FIG. 11, the upper mold 61 is separated from the glass molded product 10F by moving the upper mold 61 upward as indicated by the arrows.

It is preferable that the temperature of the glass molded product 10F when the upper mold 61 starts moving for the ascending operation is set to (Tg−30) ° C. or more and (Tg + 100) ° C. or less. For example, when Tg is 540 ° C., the temperature of the glass molded product 10F at the start of the ascending operation of the upper mold 61 is preferably set to 510 ° C. or more and 640 ° C. or less. When the temperature is lower than (Tg-30) ° C., the amount of heat shrinkage of the glass molded product 10F is increased, and defects such as cracks are likely to occur. On the other hand, when the temperature is higher than (Tg + 100) ° C., there is a concern that the surface shape of the glass molded product 10F may be collapsed or a good transferability may not be obtained with the ascending operation. Further, the upward movement amount of the upper mold 61 in the step (S18) is set to 0.2 mm or more. Thereby, it can prevent reliably that the raise upper mold 61 and the glass molded product 10F contact, and a crack generate | occur | produces. In the step (S19) described later, the upper mold 61 may be further separated from the glass molded article 10F by 4.0 mm or more so that the glass molded article 10F raised from the lower mold 62 and the upper mold 61 do not come into contact with each other. preferable.

Further, the glass molded product 10F is obtained by adding the planned product region 16 formed by pressure molding the glass material 10E filled in the first cavity portion 67 and the glass material filled in the second cavity portion 68. And a preliminary region 17 formed by pressure forming.

Next, as shown in FIG. 6, in the step (S19), the glass molded product 10F is separated from the lower mold 62 and held. FIG. 12 is a schematic cross-sectional view showing a step of separating and holding the glass molded product shown in FIG. 6 from the lower mold. As shown in FIG. 12, in the step of separating the glass molded product from the lower mold, the servo motor 83 is activated by a command from the control unit 90, and the separation mold 63 positioned below the spare area 17 is moved to the lower mold 62. Ascending from the second pressure surface 62b. Thereby, the separation mold 63 separates the glass molded product 10 </ b> F from the lower mold 62 while supporting the preliminary region 17.

In addition, if the upper mold | type 61 leaves | separates from the lower mold | type 62 after press molding, the temperature of the glass molded product 10F will fall rapidly. Further, since the upper surface of the glass molded product 10F is in contact with the atmosphere and the lower surface of the glass molded product 10F is in contact with the lower mold 62, the heat transfer rate to the surrounding environment is different between the upper surface and the lower surface of the glass molded product 10F. . As a result, when one second has passed after the upper mold 61 is separated from the glass molded product, a temperature gradient is remarkably generated from the upper surface to the lower surface of the glass molded product 10F. Thereby, it becomes easy to generate | occur | produce a curvature in the glass molded product 10F. In order to prevent such warpage, it is preferable to completely separate the glass molded product 10F from the lower mold within 1 second after the upper mold 61 is separated from the glass molded product 10F.

Subsequently, in the step of holding the glass molded product 10F, the glass molded product 10F separated from the lower mold 62 is held by the separation mold 63 so as to be exposed to the atmosphere. Thereby, at the time of cooling, the heat transfer rate to the surrounding environment becomes substantially uniform between the upper surface and the lower surface of the glass molded product 10F. For this reason, it is possible to cool the glass molded product 10F without causing the above-described temperature gradient to be noticeable, and no warping occurs during cooling.

Further, it is preferable that the separation mold 63 holds the glass molded product 10F in a state where the glass molded product 10F is separated from the upper mold 61 and the lower mold 62 by at least 2 mm. At this time, in the step (S18), when the upper mold 61 is not sufficiently separated from the glass molded product 10F, the upper mold 61 is also raised at the same time as the separation mold 63 is raised. Thereby, the influence of the radiant heat from the upper mold | type 61 and the lower mold | type 62 can be reduced. Further, the separation mold 63 holds the glass molded product 10F in the above-described state until the temperature of the glass molded product 10F becomes Tg−150 (° C.) or lower. For example, when Tg is 540 ° C., it is preferable that the temperature of the glass molded product 10F be maintained until it reaches 390 ° C. or lower in the above-described state. Thereby, the surface of the glass molded product 10F is sufficiently cured, and the surface shape is stabilized.

Further, since the glass molded product 10F is held in the above-described state, most of the upper surface and the lower surface of the planned product region 16 of the glass molded product 10F do not contact the upper mold 61 and the lower mold 62. It becomes possible to prevent cracking. In the present embodiment, the upper and lower surfaces of the glass molded product 10F are held by the separation mold 63 so as to be exposed to the atmosphere, but the present invention is not limited to this. For example, after the glass mold 10F is completely separated from the lower mold 62 within one second by the separation mold 63, the upper and lower surfaces of the glass mold 10F are held by the other holding members so as to be exposed to the atmosphere. Also good. However, it is more preferable to hold the glass molded product 10F by the separation mold 63 because the state of the glass molded product 10F is not changed during the curing of the glass molded product 10F.

In addition, in the contact part of the separation mold 63 and the glass molded product 10F, there is a concern that the above-described temperature gradient is generated and a slight warp is generated, but the separation mold 63 is cut in a process described later. Since the contact is made with the spare area 17 to be removed, the influence of the warp does not reach the product planned area 16. Therefore, a high-quality glass molded product in which warpage is suppressed is obtained from the planned product area 16. In addition, the diameter of the separation mold 63 can be set to approximately 1 mm so that the glass molded product 10 </ b> F can be held while suppressing warpage in the preliminary region 17.

Next, as shown in FIG. 6, in the step (S20), the lower mold 62 is moved to the take-out position P3 (see FIG. 3). The servo motor 82 is activated by a command from the control unit 90, and the lower mold 62 is moved in the horizontal direction (DR2 direction shown in FIG. 4), so that the lower mold 62 is positioned below the upper mold 61. To the take-out position P3 that does not face the upper die 61.

The lower mold 62 may move to the molding position P2 while the separation mold 63 protruding from the second pressure surface 62b holds the glass molded product 10F, or the separation mold is placed in the accommodation space 65 of the lower mold 62. 63 may be accommodated and the lower mold 62 may move to the molding position P2 in a state where the glass molded product 10F is placed on the molding surface of the lower mold 62.

Next, as shown in FIG. 6, in the step (S21), the glass molded product 10F is taken out from the molding die 60 and collected. For example, a known release device such as a suction device using vacuum suction may be used. Thereby, the glass molded product 10 </ b> F is released from the lower mold 62.

Next, as shown in FIG. 6, in step (S <b> 22), the glass molded product 10 </ b> F that has further solidified due to a decrease in temperature is cut, and then in step (S <b> 23), the glass molded product 10 </ b> F is polished. FIG. 13 is a schematic cross-sectional view showing a step of polishing the glass molded product taken out from the molding die shown in FIG. FIG. 14 is a schematic cross-sectional view showing the glass molded product shown in FIG. 6 after completion of the polishing step. As shown in FIG. 13, the preliminary region 17 is removed by cutting the glass molded product 10F along a broken line A shown in the drawing. Subsequently, the region below the broken line BL shown in the drawing is polished and removed. Thereby, a part of surface which was contacting the 1st pressurization surface 62a of the lower mold | type 62 among the surfaces of the glass molded product 10F is removed.

When the glass material 10E is dropped on the lower mold 62, the temperature of the glass material 10E starts to decrease due to heat transfer from the glass material 10E to the lower mold 62. Therefore, the transferability on the lower mold 62 side of the glass molded product 10F after pressure molding may deteriorate. Therefore, the surface accuracy of the surface is improved by subjecting the glass molded product 10F after pressure molding to polishing, and a cover glass 10 having a desired surface property is obtained from the glass molded product 10F as shown in FIG. . For example, the surface roughness Ra of the front surface 11 of the main surface portion 13 of the cover glass 10 can be less than 20 nm. In addition, a polishing process can also be abbreviate | omitted when transferability does not deteriorate and a desired surface property is obtained. In this case, the planned product area 16 is directly used as the cover glass 10.

In addition, after manufacturing of the glass molded product 10F shown in FIG. 13 is completed, when manufacturing the glass molded product 10F continuously, the separation mold 63 is lowered and stored in the storage space 65, and the lower mold 62 is again mounted. It moves to glass dripping position P1 (process (S12)), and should just repeat the subsequent processes. In addition, the manufacturing method of the glass molded product of this Embodiment may also include processes other than the process demonstrated above. For example, a step of inspecting the shape of the glass molded product 10F before taking out the glass molded product 10F, or a step of cleaning the molding die 60 after collecting the glass molded product 10F may be provided.

By using the method and apparatus for producing a glass molded product according to the present embodiment described above, it is possible to obtain a desired 3D shape with a single pressure molding and to suppress warping. This eliminates the need to separately provide a grinding and polishing process for obtaining a desired 3D shape from the plate-like glass material and a pressurizing process for correcting warpage, and greatly simplifies the manufacturing process of the glass molded product. It becomes possible. Moreover, it becomes possible to manufacture a high-quality glass molded product in which warpage is suppressed.

(Embodiment 2)
FIG. 15 is a schematic diagram illustrating a configuration of a glass molded product manufacturing apparatus according to the second embodiment. With reference to FIG. 15, a glass molded product manufacturing apparatus 50 </ b> A according to Embodiment 2 will be described.

When the glass molded product manufacturing apparatus 50A according to the present embodiment is compared with the glass molded product manufacturing apparatus 50 according to the first embodiment, a molding die 60 is configured by the upper mold 61A and the lower mold 62. The difference is that a clamping mechanism 63A as a separating means is provided, and that the upper mold 61A is movable in the horizontal direction.

The control unit 90 controls a series of sequences relating to the manufacture of the glass molded product, such as timing of cutting the glass material 10D by the air cylinder 84, timing of movement of the upper mold 61A, the lower mold 62, and the clamp mechanism 63A.

The servo motor 81 receives a command from the control unit 90, and reciprocates the upper mold 61A in the DR1 direction (pressure direction) and the DR3 direction (direction perpendicular to the pressure direction) shown in FIG. A part of the clamp mechanism 63A is accommodated in the upper die 61A, and moves in the DR1 direction and the DR3 direction according to the movement of the upper die 61A. The servo motor 83 receives a command from the control unit 90 and independently moves the clamp mechanism 63A back and forth in the DR4 direction (perpendicular to the pressurizing direction).

The upper mold 61A is opposed to the lower mold 62 by the servo motor 81, so as to press the glass material (opposing position P4), and the position for taking out the glass molded product from the clamp mechanism 63A (extraction position P5). ) Is configured to be movable between.

The clamp mechanism 63A is for holding a glass molded product formed by the upper mold 61A and the lower mold 62. The servo motor 83 holds a position for holding the glass molded product and waits for pressure molding. It is configured to be movable between positions to be moved. The clamp mechanism 63A holds the glass molded product by sandwiching the glass molded product in a direction perpendicular to the pressurizing direction (hereinafter sometimes referred to as a horizontal direction). The servo motor 83 is provided with a specification capable of applying a predetermined pressure in the horizontal direction.

In the clamp mechanism 63A, the holding portion 631 (see FIG. 16) that is a part that comes into contact with the glass molded product is a known material as a molding die for manufacturing the glass molded product described in the first embodiment. It is also preferable to provide a coating layer on the surface of the holding portion 631 as in the first embodiment. Furthermore, the holding part of the clamp mechanism 63A may be configured to be heated to a predetermined temperature.

FIG. 16 is a schematic cross-sectional view of the molding die and the clamp mechanism shown in FIG. FIG. 17 is a top view of the upper mold and the clamp mechanism shown in FIG. With reference to FIG. 16 and FIG. 17, the upper mold | type 61A, the lower mold | type 62, and the clamp mechanism 63A which comprise the metal mold | die 60 for shaping | molding are demonstrated.

As shown in FIG. 16, when the upper mold 61A and the lower mold 62 are close to each other, a cavity 66 is formed between the upper mold 61A and the lower mold 62. The cavity 66 includes a first cavity portion 67 and a second cavity portion 68.

As shown in FIGS. 16 and 17, the upper mold 61A includes a mold surface 61a that defines the upper surface of the first cavity portion 67, a mold surface 61b that defines the upper surface of the second cavity portion 68, and the periphery of the mold surface 61b. And a flat surface 61c located at the bottom. The upper mold 61A has a side wall 611 that protrudes toward the lower mold 62 from the mold surfaces 61a and 61b and the flat surface 61c. The lower mold 62 includes a first pressure surface 62 a that defines the lower surface of the first cavity portion 67, a second pressure surface 62 b that defines the lower surface of the second cavity portion 68, and a side surface 62 c.

The clamp mechanism 63A includes a holding portion 631 for holding a glass molded product and a support portion 632 that supports the holding portion 631. The pair of clamp mechanisms 63A (the holding portion 631 and the support portion 632) are disposed so as to face each other so that the lower die 62 is positioned therebetween when viewed along the pressurizing direction, and are short of the upper die 61A. Two sets are arranged in the approximate center of the side. By bringing the holding parts 631 arranged opposite to each other into contact with the glass molded product, the glass molded product can be clamped along a direction (horizontal direction) perpendicular to the pressing direction of the glass material. The holding portion 631 is disposed inside the side wall 611, and the support portion 632 is accommodated in the side wall 611.

When the upper mold 61A and the lower mold 62 are close to each other, the flat surface 61c is positioned outside the lower mold 62, and the inner surface of the side wall 611 faces the side surface 62c of the lower mold 62. The holding portion 631 is disposed to face the side surface 62c, and a gap is formed between the holding portion 631 and the side surface 62c.

Note that the number of the clamp mechanisms 63A is not limited to four, and may be two or more as long as the glass molded product can be stably supported via the preliminary region 17. For example, the pair of clamp mechanisms 63A may have a flat plate shape along the long side or short side of the upper die 61A, and may be provided on the long side or short side of the upper die 61A. .

FIG. 18 is a flowchart showing a method for manufacturing a glass molded product according to Embodiment 2 of the present invention. Each of FIGS. 19 to 23 is a schematic cross-sectional view showing a predetermined step of the steps shown in FIG. FIG. 24 is a diagram showing a state in which the clamp mechanism holds the glass molded product in the second step shown in FIG. Hereinafter, with reference to these FIG. 18 to FIG. 24, the manufacturing method and manufacturing apparatus of the glass molded product according to the present embodiment will be described.

The manufacturing method and manufacturing apparatus for a glass molded product according to the present embodiment are basically based on the manufacturing method and manufacturing apparatus for a glass molded product according to the first embodiment described above. However, in the present embodiment, since the configuration of the molding die provided in the manufacturing apparatus 50A and the configuration of the clamp mechanism 63A as the separating means are different, the glass molded product is mainly used in comparison with the first embodiment. The process in the process of separating from the mold is different.

In the method for manufacturing a glass molded product according to the present embodiment, as shown in FIG. 18, first, in the steps (S11) to (S15), the method for manufacturing the glass molded product according to the first embodiment described above. The same processing is performed.

Next, in the step (S16) shown in FIG. 18, the upper mold 61A moves downward. FIG. 19 is a schematic cross-sectional view showing a step of lowering the upper mold and approaching the lower mold shown in FIG. As shown in FIG. 19, the servo motor 81 is activated by a command from the control unit 90, and the upper die 61A moves downward as indicated by an arrow. Along with this, the clamp mechanism 63A also moves downward together with the upper mold 61A. Thereby, the upper mold 61A and the lower mold 62 approach each other. As the upper mold 61A continues to move downward from the state shown in FIG. 19, the glass material 10E fills the first cavity portion 67 and the second cavity portion 68 defined by the upper mold 61A and the lower mold 62 ( FIG. 20).

Next, as shown in FIG. 18, in the step (S17A), the glass material is pressed by the upper mold 61A and the lower mold 62. FIG. 20 is a schematic cross-sectional view showing a step of pressure-forming the glass material melted by the molding die shown in FIG. As shown in FIG. 20, the glass material 10E is sandwiched between the molding surfaces (the mold surface 61a and the mold surface 61b) of the upper mold 61A and the molding surfaces (the first pressure surface 62a and the second pressure surface 62b) of the lower mold 62. Pressure. Thereby, the glass raw material 10E is pressure-molded, and the glass molded product 10F is manufactured. At this time, the clamp mechanism 63 </ b> A faces the side surface 62 c of the lower mold 62.

Next, as shown in FIG. 18, in the step (S18A), the upper mold 61A is moved up. FIG. 21 is a schematic cross-sectional view showing the step of moving up the upper mold shown in FIG. As shown in FIG. 21, the upper mold 61A is separated from the glass molded product 10F by moving the upper mold 61A upward as shown in the arrow direction. At this time, the upper mold 61A is raised until the clamp mechanism 63A and the preliminary region 17 of the glass molded product face each other. In order to prevent contact between the upper mold 61A and the glass molded product 10F, the upper mold 61A is preferably configured such that the molding surface of the upper mold 61A is separated from the glass molded product 10F by 2 mm or more.

Next, as shown in FIG. 18, in the step (S19A), the glass molded product 10F is separated from the lower mold 62 and held. FIG. 22 is a schematic cross-sectional view showing a first step of the step of separating and holding the glass molded product from the lower mold shown in FIG. FIG. 23 is a schematic cross-sectional view showing a second step of the step of separating and holding the glass molded product shown in FIG. 18 from the lower mold. As shown in FIG. 22, in the first step, the servo motor 83 is activated by a command from the control unit 90, and the support unit 632 of the clamp mechanism 63A as the separating unit moves in the horizontal direction. The holding portion 631 of the clamp mechanism 63A comes into contact with the end portion of the preliminary region 17, and the glass molded product 10F is clamped by the clamp mechanism 63A by a constant pressure loaded in the horizontal direction from the holding portion 631.

Next, as shown in FIG. 23, in the second step, first, in the step of separating the glass molded product 10F from the lower die 62, the upper die 61A is raised in the direction of the arrow, whereby the clamping mechanism 63A is Ascends integrally with the upper mold 61A. Thereby, the glass molded product 10F sandwiched by the clamp mechanism 63A is separated from the lower mold 62. Further, in order to suppress the warpage of the glass molded product 10F caused by the temperature gradient described above, the glass molded product 10F is sandwiched and separated within one second after the upper mold 61A is separated from the glass molded product 10F.

Subsequently, in the step of holding the glass molded product 10F in the second step, the glass molded product 10F is held in the atmosphere. At this time, the glass molded product 10F is held until it reaches a predetermined temperature (Tg−150 (° C.)) or less with a distance of 2 mm or more from the upper mold 61 and the lower mold 62. As shown in FIG. 24, since the glass molded product 10F is held in a state where the holding portion 631 is in contact with the end of the preliminary region 17, the upper and lower surfaces of the planned product region 16 and the preliminary region 17 of the glass molded product 10F. Are exposed to the atmosphere. Since the heat transfer coefficient to the surrounding environment is substantially uniform between the upper surface and the lower surface of the glass molded product 10F, the glass molded product 10F can be cooled without causing the above-described temperature gradient to be noticeable. As a result, no warpage occurs even during cooling.

Next, as shown in FIG. 6, in step (S20), the upper mold 61A is moved to the take-out position P5 (see FIG. 15). The servo motor 81 is activated by a command from the control unit 90, and the upper die 61A is moved in the horizontal direction (DR3 direction shown in FIG. 15), so that the upper die 61A is opposed to the position P4 positioned above the lower die 62. To the take-out position P5 that does not face the lower mold 62. Thereby, the glass molded product 10F moves to the take-out position P5 while being held by the clamp mechanism 63A.

The movement to the take-out position is not limited to the above case. The upper mold 61A is lowered toward the lower mold 62, the holding state of the clamp mechanism 63A is released, and the glass molded product 10F is placed on the lower mold 62. Then, the lower mold 62 may be moved to the take-out position P3 as in the first embodiment.

Next, as shown in FIG. 18, in the steps (S21) to (S23), the same processing as that in the method for manufacturing a glass molded product according to the first embodiment described above is performed. Thereby, a glass molded product with high surface accuracy is manufactured. In addition, when transferability does not deteriorate and a desired surface property is obtained, the polishing step (S23) of the glass molded product 10F can be omitted as in the first embodiment.

Even when the method and apparatus for manufacturing a glass molded product according to the present embodiment described above are used, substantially the same effects as those of the method and apparatus for manufacturing a glass molded product according to Embodiment 1 are obtained. In particular, since only the end portion of the glass molded product 10F is in contact with the clamp mechanism 63A, the upper surface and the lower surface of the glass molded product 10F are all exposed to the atmosphere, so that warpage can be further suppressed.

In the present embodiment, the case where the upper mold 61A has the side wall 611, a part of the clamp mechanism 63A is accommodated in the side wall 611, and the upper mold 61A and the clamp mechanism 63A work together is described as an example. However, the upper mold 61A does not have the side wall 611, the clamp mechanism 63A is not accommodated in the upper mold 61A, and the clamp mechanism 63A may move independently along the vertical direction and the horizontal direction. In this case, the clamp mechanism 63A may move to the take-out position P5.

(Experimental example)
FIG. 25 is a diagram illustrating an example of an experiment performed on the first embodiment. With reference to FIG. 25, an experimental example performed with respect to the first embodiment will be described. In the experimental example, a total of three types of glass molded articles were manufactured based on the conditions of Examples 1 and 2 and Comparative Example 1, and the warpage (flatness) of these glass molded articles was measured.

In common with Examples 1 and 2 and Comparative Example 1, glass molded articles were manufactured using the direct press method described above. The external dimensions of the planned product area of the glass molded product are 130 mm × 60 mm. The external dimensions of the crow molded product including the preliminary region are 150 mm × 90 mm. Moreover, the total height of the product planned area | region 16 is 5 mm, and the plate | board thickness of the main surface part of the glass molded product before a grinding | polishing process is 1 mm among the product planned areas 16.

The glass material used for glass forming is aluminosilicate glass, and the glass transition temperature Tg is 540 ° C. The linear expansion coefficient of the glass material used for glass forming is 98 [× 10 ⁻⁷ / ° C.] in the range of 100 ° C. to 300 ° C. The temperature of the upper mold at the time of pressure molding is 500 ° C., the temperature of the lower mold at the time of pressure molding is 520 ° C., and the temperature of the glass material just before the pressure molding is 680 ° C.

PV values serving as indices of warpage (flatness) were measured for the glass molded products in Examples 1 and 2 and Comparative Example 1. Specifically, the PV value of the surface formed by the upper mold among the surfaces of these glass molded products was measured along the longitudinal direction. Here, the PV value indicates a difference between the maximum height (Peak) and the maximum valley depth (Valley) in the measurement target region. The quality standard of warp that can be used as a product is defined as PV value of 80 μm or less, PV value of 0 μm or more and 20 μm or less is “good”, 20 μm over 80 μm or less is “good”, 80 μm over The thing was judged as “impossible”.

As shown in FIG. 25, the glass molded product in Comparative Example 1 is formed by using the separation mold 63 after separating the upper mold 61 from the glass molded product in the step of separating the glass molded product from the lower mold. The time until the product was separated from the lower mold 62 was 2.0 seconds. The glass molded product in Comparative Example 1 manufactured under such manufacturing conditions had a PV value of 150 μm and was determined to be “impossible”.

In the step of separating the glass molded product from the lower mold, the glass molded product in Experimental Example 1 is separated from the lower mold 62 using the separation mold 63 after the upper mold 61 is separated from the glass molded product. The production time was 0.5 seconds. The glass molded product in Experimental Example 1 manufactured under such manufacturing conditions had a PV value of 12 μm and was determined to be “good”.

In the step of separating the glass molded product from the lower mold, the glass molded product in Experimental Example 2 was separated from the lower mold 62 using the separation mold 63 after the upper mold 61 was separated from the glass molded product. The production time was 1.0 seconds. In the glass molded product in Experimental Example 2 manufactured under such manufacturing conditions, the PV value was 25 μm, and it was determined as “possible”.

Based on the above results, in the step of separating and holding the glass molded product from the lower mold, the glass molded product is separated from the lower mold 62 within 1 second after the upper mold 61 is separated from the glass molded product. It was proved experimentally that it is possible to suppress warpage.

In the first and second embodiments described above, the case where a glass molded product is applied to the cover glass that covers the display 40 of the display device 100 has been described as an example. However, the present invention is not limited to this. A glass molded product may be applied to an exterior cover of an electronic device such as a digital camera.

In the first and second embodiments, in the step of separating the upper mold from the glass molded product, the upper mold 61, 61A is raised after the molten glass material is pressure-molded by the upper mold 61, 61A and the lower mold 62. Although the case where the upper molds 61 and 61A are separated from the glass molded article 10F by moving them is described as an example, the present invention is not limited thereto, and the lower mold 62 is moved downward to move the upper mold 61 from the glass molded article 10F. , 61A may be separated. In this case, the lower mold is configured to be movable downward, and the lower mold 62 is moved downward by starting the servo motor 82 in response to a command from the control unit 90. The upper mold may be separated from the glass molded product 10F by moving both the upper mold 61, 61A and the lower mold 62 (raising the upper mold 61, 61A and lowering the lower mold 62).

Further, in the first and second embodiments, in the step of separating the glass molded product 10F from the lower mold 62, the separation mold 63 as the separating means and the upper mold 61A equipped with the clamp mechanism 63A are moved up and down, The case where the glass molded product 10F is separated from the lower mold 62 has been described as an example. However, the present invention is not limited to this. In the first embodiment, the glass molded product is supported by the separation mold 63 (the separation mold 63). The glass mold 10 </ b> F may be separated from the lower mold 62 by moving the lower mold 62 downward in a state in which is stopped. As a result, the separation mold 63 is relatively raised from the second pressure surface 62b. Also in the second embodiment, the glass molded product 10F may be separated from the lower die 62 by moving the lower die 62 downward while the glass molded product is sandwiched by the clamp mechanism 63A.

In the first and second embodiments, in the step of holding the glass molded product 10F, the glass molded product with the separation mold 63 and the clamp mechanism 63A as the separating means in contact with the preliminary region 17 of the glass molded product 10F. Although the case of holding 10F has been described as an example, the present invention is not limited to this, and the glass molded product 10F may be held in a state of being in contact with the planned product area 16. Specifically, in Embodiment 1, the separation mold 63 may be arranged on the first pressure surface 62a side. In the first and second embodiments, since the spare area 17 is used as a product, the spare area 17 is included in the planned product area 16, and as a result, the separation mold 63 and the clamp mechanism 63A are manufactured as products. The planned area 16 may be touched.

In the first and second embodiments, the molding surfaces of the upper molds 61 and 61A (the mold surface 61a and the mold surface 61b) have a convex shape protruding toward the lower mold 62, and the molding surface of the lower mold 62 Although the case where (the mold surface 62a and the mold surface 62b) has a concave shape that is recessed so as to be separated from the upper molds 61 and 61A has been described as an example, the present invention is not limited thereto. The molding surface of the mold 62 may have a planar shape.

That is, in Embodiments 1 and 2, the glass molded product 10F immediately after pressure molding formed by the upper mold 61, 61A and the lower mold 62 is connected to the substantially flat main surface portion and the outer edge of the main surface portion. However, the present invention is not limited to this and may be a substantially flat plate shape. As described above, the glass molded article 10F immediately after the pressure molding is appropriately changed by appropriately changing the shape of the molding surface of the upper mold 61, 61A and the shape of the molding surface of the lower mold 62 within a range not departing from the gist of the present invention. The shape can be changed as appropriate. Moreover, you may manufacture the glass molded product which has a flat plate shape by cutting out a main-plate part from a 3D-shaped glass molded product.

As mentioned above, although embodiment of this invention was described, embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and includes meanings equivalent to the terms of the claims and all changes within the scope.

10 cover glass, 10D, 10E glass material, 10F glass molded product, 10H opening, 11 front surface, 12 back surface, 13 main surface portion, 14 connection portion, 15 side surface portion, 16 product planned area, 17 spare area, 20 exterior plate, 30 circuit board, 31 speaker, 40 display, 42 image display unit, 50, 50A manufacturing device, 60 molding mold, 61, 61A upper mold, 61a, 61b mold surface, 61c plane, 62 lower mold, 62a 1st pressure surface, 62b 2nd pressure surface, 62c side surface, 63 separation mold, 63A clamp mechanism, 63a top surface, 64 glass cutter, 65 accommodating space, 66 cavity, 67 1st cavity part, 68 2nd cavity part, 70 Material supply section, 71 Continuous melting furnace, 73 nozzles, 81, 8 , 83 servo motor, 84 an air cylinder, 90 control unit, 100 display unit, 611 the side wall, 631 holder, 632 support.

Claims (10)

Preparing an upper mold and a lower mold;
Supplying a molten glass material to the lower mold;
Pressing the glass material supplied to the lower mold with the upper mold and the lower mold; and
Separating the upper mold from a glass molded product formed by pressing the glass material with the upper mold and the lower mold by moving at least one of the upper mold and the lower mold; and
Within 1 second of separating the upper mold from the glass molded article, separating the glass molded article from the lower mold using a separating means;
And a step of holding the glass molded product so that the glass molded product separated from the lower mold is exposed to the atmosphere. When the glass transition point of the glass material is Tg, the temperature of the glass material at the time when at least one of the upper mold and the lower mold starts to move is (Tg−30) ° C. or more and (Tg + 100) ° C. or less. The manufacturing method of the glass molded product of Claim 1 which is. The glass molded article according to claim 1 or 2, wherein the step of holding the glass molded article includes a step of holding the glass molded article until a temperature of the glass molded article is at least (Tg-150) ° C or lower. Manufacturing method. The step of holding the glass molded product includes the step of holding the glass molded product in a state in which the glass molded product separated from the lower mold is separated from the upper mold and the lower mold by at least 2 mm. Item 4. The method for producing a glass molded article according to any one of Items 1 to 3. The glass molded product includes a planned product area and a spare area located around the planned product area,
The method for producing a glass molded article according to any one of claims 1 to 4, wherein, in the step of holding the glass molded article, the preliminary region is held by the separating means. The lower mold includes a first pressure surface for pressure-forming the glass material in a portion corresponding to the planned product area, and a second pressure surface for pressure-forming the glass material in a portion corresponding to the preliminary area. Including
In the step of separating the upper mold from the glass molded article, the upper mold is moved up from the glass molded article,
In the step of separating the glass molded product from the lower mold, the separation means is separated from the lower mold by supporting the preliminary region by rising from the second pressure surface. Item 6. A method for producing a glass molded article according to Item 5. In the step of separating the glass molded product from the lower mold, the separating means sandwiches the preliminary region along a direction perpendicular to the pressurizing direction of the glass molded product, thereby removing the glass molded product from the lower mold. The manufacturing method of the glass molded product of Claim 5 made to isolate | separate from a type | mold. An upper mold and a lower mold for pressure-molding a molten glass material;
Separating means for separating the glass molded product formed by pressure molding the glass material by the upper mold and the lower mold from the lower mold;
A first drive unit for moving the upper mold;
A second drive unit for moving the lower mold;
A third drive unit for moving the separating means;
A control unit that controls operations of the first drive unit, the second drive unit, and the third drive unit;
The control unit separates the upper mold from the glass molded article by moving at least one of the upper mold and the lower mold, and within one second after separating the upper mold from the glass molded article. The first driving is performed such that the glass molded article is separated from the lower mold using a separating unit, and the glass molded article is exposed to the atmosphere by holding the glass molded article separated from the lower mold. Apparatus for manufacturing a glass molded product, which controls operations of the first drive unit and the third drive unit. The glass molded product includes a planned product area and a spare area located around the planned product area,
The lower mold includes a first pressure surface for pressure-forming the glass material in a portion corresponding to the planned product area, and a second pressure surface for pressure-forming the glass material in a portion corresponding to the preliminary area. Including
The control unit separates the upper mold from the glass molded article by raising the upper mold from the glass molded article, and the separating means rises from the second pressure surface to support the preliminary region. The apparatus for manufacturing a glass molded product according to claim 8, wherein the operations of the first drive unit, the second drive unit, and the third drive unit are controlled so that the glass molded product is separated from the lower mold. . The glass molded product includes a planned product area and a spare area located around the planned product area,
The control unit is configured so that the separation unit separates the glass molded product from the lower mold by sandwiching the preliminary region along a direction perpendicular to a pressing direction of the glass molded product. The manufacturing apparatus of the glass molded product of Claim 8 which controls operation | movement of a drive part, a said 2nd drive part, and a said 3rd drive part.

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