WO2015118663A1

WO2015118663A1 - Glass moulded article manufacturing method and manufacturing device

Info

Publication number: WO2015118663A1
Application number: PCT/JP2014/052919
Authority: WO
Inventors: 平岡　潔; 俊也富阪
Original assignee: コニカミノルタ株式会社
Priority date: 2014-02-07
Filing date: 2014-02-07
Publication date: 2015-08-13

Abstract

A glass moulded article manufacturing method based on the present invention comprises: a step in which a reservoir member (41) is disposed below an outflow port, out of which a molten glass flow (70) continuously flows vertically downwards; a step in which molten glass gobs are separated from the molten glass flow (70) by cutting the molten glass flow (70) after reserving the molten glass flow (70) in the reservoir member (41); a step in which the molten glass gobs that have been separated and reserved are caused to drop from the reservoir member (41); and a step in which lower moulds (31) and an upper mould (32) are used to catch the dropped molten glass gobs and in which the lower moulds (31) and the upper mould (32) are used to compression-mould the dropped molten glass gobs. A surface in which fine irregularities are formed so as to reduce a contact surface area between the reserved molten glass gobs is used as the reservoir member (41).

Description

Manufacturing method and manufacturing apparatus for glass molded product

The present invention relates to a glass molding product manufacturing method and a manufacturing apparatus for manufacturing a glass product or a glass blank as a glass molding product by press molding molten glass using a mold.

As one of the glass molded products, 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 requires excellent design. In recent years, a cover glass having a complicated three-dimensional shape such as a substantially box shape composed of a main plate portion and a side plate portion connected to the outer edge thereof has been demanded.

On the other hand, from the viewpoint of simplification of the manufacturing process, a so-called direct press method in which a molten glass is directly dropped onto a mold, and a glass molded product is manufactured by pressure molding the dropped molten glass using the mold. It has been known. Since this direct press method can reproduce a curved surface shape, a projection shape, a hole shape, etc. on a glass molded article with a relatively high transferability, it can be said that it is suitable for a manufacturing method of a cover glass having a complicated three-dimensional shape as described above. .

However, when manufacturing glass moldings using the direct press method, the molten glass is very hot, so the temperature of the mold rises with this, and the glass material is added to the mold. And the like, and the mold surface of the mold is oxidized and roughened by repeated manufacturing.

In order to prevent the glass material from fusing to the mold, a cooling mechanism for cooling the mold may be additionally provided in the manufacturing apparatus. However, it is not easy to control the mold to a desired temperature. If the mold is cooled too much, the transferability and surface accuracy of the glass molded product to be produced are adversely affected, which hinders the production of the glass molded product with a high yield.

Also, if the mold surface of the mold becomes rough, the transferability and surface accuracy of the manufactured glass molded product will be adversely affected, so the mold must be frequently replaced, As a result, the running cost of the manufacturing apparatus increases and the operating rate of the manufacturing apparatus decreases.

In order to solve these problems, Japanese Patent Application Laid-Open No. 2006-265085 (Patent Document 1) discloses that a molten glass lump is once added to a second mold for forming a glass molded product by pressure-molding the molten glass lump. A manufacturing method and a manufacturing apparatus for a glass molded article are disclosed in which a first mold is used that receives and drops the molten glass lump to the second mold after the temperature of the molten glass lump has dropped.

JP 2006-265085 A

However, when the method and apparatus for producing a glass molded product as disclosed in JP-A-2006-265085 is used, when the molten glass lump is received by the first mold, the molten glass lump A remarkable temperature distribution occurs between the portion that contacts the mold 1 and the portion that does not contact the mold, and the glass molded product to be manufactured is subjected to pressure molding using the second mold performed thereafter. There arises a problem that the transferability has a non-negligible adverse effect.

In addition, unless some contrivance is applied to the first mold, it is inevitable that the glass material is fused to the surface of the first mold or the surface of the first mold is oxidized. It becomes necessary to exchange this frequently for the type 1. Therefore, the subject which cannot fully suppress the increase in the running cost of a manufacturing apparatus and the fall of the operating rate of a manufacturing apparatus remains.

Therefore, the present invention has been made to solve such problems, and a glass molded product manufacturing method and manufacturing apparatus based on a direct press method capable of manufacturing a glass molded product efficiently and with high accuracy are provided. The purpose is to provide.

The method for producing a glass molded product according to the present invention includes a step of disposing a reservoir receiving member below an outlet from which a molten glass flow continuously flows out vertically downward, and the molten glass flow to the reservoir receiving member. Cutting the molten glass flow after receiving the reservoir, separating the molten glass lump from the molten glass flow, dropping the molten glass lump separated and received from the reservoir receiving member, dropping A step of receiving the molten glass lump using a mold and press-molding the molten glass lump using the mold, and the contact area between the molten glass lump received as a reservoir receiving member is reduced. As described above, those having minute irregularities formed on the surface are used.

An apparatus for manufacturing a glass molded product according to the present invention includes a material supply unit for continuously flowing a molten glass flow from an outlet toward a vertically downward direction, and a molten glass lump from the molten glass flow by cutting the molten glass flow. A cutting mechanism for separating the molten glass flow, a reservoir receiving member for dropping the molten glass lump separated and received from the molten glass flow, and a drop receiving member for dropping the molten glass lump. A reservoir receiving member driving mechanism for driving the reservoir receiving member, a mold for receiving and pressing the molten glass lump, a mold driving mechanism for moving the mold, the cutting mechanism, the reservoir receiving member driving mechanism, and the mold And a control unit that controls the operation of the drive mechanism. The reservoir receiving member is formed with minute irregularities on the surface so as to reduce the contact area between the molten glass lump and the reservoir received. The control unit arranges the reservoir receiving member below the outlet, and then stores the molten glass flow at the reservoir receiving member, and then cuts the molten glass flow from the molten glass flow. The separated molten glass lump is collected and received by the reservoir receiving member, and then the molten glass lump is dropped from the reservoir receiving member, and then the dropped molten glass lump is received using the mold. The operations of the cutting mechanism, the reservoir receiving member driving mechanism, and the mold driving mechanism are controlled so as to perform pressure molding using the mold.

According to the present invention, it is possible to provide a glass molded product manufacturing method and a manufacturing apparatus based on a direct press method capable of efficiently and accurately manufacturing a glass molded product.

It is a schematic perspective view of the state which partially decomposed | disassembled the display apparatus provided with the cover glass manufactured according to the manufacturing method of the glass molded product in embodiment 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 a schematic block diagram of the manufacturing apparatus of the glass molded product in embodiment of this invention. It is a figure which shows the planar layout of the manufacturing apparatus shown in FIG. FIG. 4 is a schematic perspective view of a reservoir receiving member shown in FIG. 3. It is an enlarged plan view which shows the shape of the surface of the reservoir receiving member shown in FIG. It is an expanded sectional view which shows the shape of the surface of the reservoir receiving member shown in FIG. It is a figure which shows the manufacture flow according to the manufacturing method of the glass molded product in embodiment of this invention. It is a figure which shows the state after the process of arrange | positioning the reservoir receiving member shown in FIG. 7 in a reservoir receiving position. It is a figure which shows the process of cut | disconnecting the molten glass flow shown in FIG. 7 with a cutter. FIG. 8 is an enlarged schematic cross-sectional view of a contact portion between a molten glass lump and a reservoir receiving member in a step of receiving the molten glass lump shown in FIG. 7 with a reservoir receiving member. It is a figure which shows the state after the process of arrange | positioning the reservoir receiving member shown in FIG. 7 in a reservoir receiving cancellation | release position. It is a figure which shows the process of dripping the molten-glass lump shown in FIG. 7 to a lower mold | type. It is a figure which shows the state after the process of moving the lower mold | type shown in FIG. 7 to a pre-pressurization position, and pre-pressing a molten glass lump. It is a figure which shows the process of lowering the upper mold | type shown in FIG. It is a figure which shows the process of filling a molten glass lump in the cavity shown in FIG. It is a figure which shows the process of raising the upper mold | type shown in FIG. It is a figure which shows the state of the glass molded product after the taking-out process of the glass molded product shown in FIG. It is an enlarged plan view which shows another example of the shape of the surface of the reservoir receiving member shown in FIG. It is an expanded sectional view which shows another example of the shape of the surface of the reservoir receiving member shown in FIG. It is an enlarged plan view which shows another example of the shape of the surface of the reservoir receiving member shown in FIG. It is an expanded sectional view which shows another example of the shape of the surface of the reservoir receiving member shown in FIG. It is the table | surface which showed the result of the verification test which verified the effect of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 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.

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, and FIG. 2 is a display device shown in FIG. It is a schematic cross section along the II-II line. First, prior to explaining the manufacturing method and manufacturing apparatus for a glass molded product in the embodiment of the present invention, the cover glass manufactured using the manufacturing method and the manufacturing apparatus and the display device including the cover glass will be described with reference to FIG. This will be described with reference to FIG. The display device shown in FIGS. 1 and 2 is a so-called smartphone.

As shown in FIGS. 1 and 2, the display device 100 has a flat, substantially rectangular shape, a cover glass 110 as a glass product, an exterior plate 120 having a flat shape, and an exterior plate 120. The circuit board 130 disposed above is mainly provided with 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 positioned on the outer edge of the main plate portion 111 and the flat main plate portion 111 having a rectangular shape in plan view provided so as to cover the image display portion 142 of the display 140. It includes 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.

As shown in FIG. 2, in the display device 100, 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. As a result, the image information displayed on the image display unit 142 is recognized by the user. In addition, when 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.

In the above description, a substantially box-shaped cover glass 110 having a flat main plate portion 111 having a substantially rectangular shape in plan view and four side plate portions 112 connected from four sides located on the outer edge of the main plate portion 111. However, instead of this, a cover glass having a shape in which the side plate portion is continuously provided from only a part of the outer edge of the flat plate-like main plate portion may be used, or the side plate portion is completely included. Instead, you may use the cover glass which consists only of a flat main plate part. Further, the shape of the main plate portion is not limited to a substantially rectangular shape in plan view, and other shapes may be used.

The cover glass 110 described above has a glass composition of 50 [wt%] to 70 [wt%] SiO ₂ , 5 [wt%] to 15 [wt%] Al ₂ O ₃ , and 0 [wt%]. Wt%] to 5 [wt%] B ₂ O ₃ , 2 [wt%] to 20 [wt%] Na ₂ O, and 0 [wt%] to 10 [wt%] K _2. O, 0 [wt%] to 10 [wt%] MgO, 0 [wt%] to 10 [wt%] CaO, and 0 [wt%] to 5 [wt%] BaO It is preferable that TiO _{2 of} 0 [wt%] or more and 5 [wt%] or less and ZrO _{2 of} 0 [wt%] or more and 15 [wt%] or less are contained.

If the cover glass 110 has the glass composition as described above, when the glass transition point is Tg [° C.], it greatly affects the shape transferred to the glass by pressure molding (Tg-30 ) Maintains proper glass viscosity in a temperature range of [° C.] or more and (Tg + 150) [° C.] or less, and can complete surface transfer while ensuring good transferability. Can be suppressed.

The linear expansion coefficient α of the glass is preferably 70 [× 10 ⁻⁷ / ° C.] or more and 110 [× 10 ⁻⁷ / ° C.] or less in a 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 preferable. Glass having the above characteristics is particularly suitable for forming a cover glass having a curved shape.

Further, 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 manufacturing method and manufacturing apparatus of the glass molded product in this Embodiment mentioned later can be used suitably.

When the total height is less than 1 [mm], the design is not excellent and the added value in the three-dimensional shape is lowered. On the other hand, if the total height is greater than 10 [mm], it becomes difficult to fill the molten glass dropped onto the mold in the pressure molding process described later up to the end of the cavity defined by the mold. That is, the molten glass starts to be cured before the molten glass is filled so as to reach the end of the cavity, which makes it difficult to obtain a glass molded product having a desired three-dimensional shape.

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 diagram showing a planar layout of the manufacturing apparatus shown in FIG. 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. In addition, the manufacturing apparatus of the glass molded product in this Embodiment is based on what is called a direct press method. In addition, the glass molded product manufacturing apparatus in the present embodiment sequentially manufactures a plurality of glass products.

As shown in FIGS. 3 and 4, the glass molded product manufacturing apparatus 1 includes a material supply unit 10, a cutting unit 20, a molding unit 30, a reservoir receiving unit 40, a mold release unit 50, and a control unit 60. And mainly.

The material supply unit 10 is a part for melting the glass material and supplying the molten glass to the molding unit 30, and the molding unit 30 is a part for pressure-molding the supplied molten glass using a mold. The cutting unit 20 is a part that adjusts the amount of molten glass supplied to the forming unit 30 to an appropriate amount, and the reservoir receiving unit 40 temporarily supplies molten glass when supplying the molten glass to the forming unit 30. It is a part that collects. Moreover, the mold release part 50 is a part which takes out the shape | molded glass molded product from a metal mold | die, and the control part 60 performs operation | movement of the cutting | disconnection part 20, the shaping | molding part 30, the reservoir receiving part 40, and the mold release part 50 which were mentioned above. It is a part to control.

The material supply unit 10 includes a continuous melting furnace 11, a nozzle unit 12, and an outflow pipe 13. The continuous melting furnace 11 melts a glass material and stores the molten glass, and 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 13a (see FIG. 8 and the like) at the lower end thereof, and allows the molten glass flow 70 to flow out continuously from the outflow port 13a vertically downward.

The cutting unit 20 includes a cutter 21 and a cutter driving mechanism 22 as a cutting mechanism. The cutter 21 cuts the molten glass flow 70 flowing out from the outflow pipe 13 and separates the cut portion from the molten glass flow 70, and is driven by the above-described cutter driving mechanism 22. The cutter 21 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 flow 70. The cutter driving mechanism 22 receives a command from the control unit 60 and drives the cutter 21. As the cutter drive mechanism 22, 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 30 includes a lower mold 31, an upper mold 32, a lower mold drive mechanism 33, and an upper mold drive mechanism 34. The lower mold 31 is a mold that is disposed vertically downward in a pressure molding process described later, and the upper mold 32 is a mold that is disposed vertically upward in a pressure molding process described later. The lower mold 31 is moved by being driven by the above-described lower mold drive mechanism 33, and the upper mold 32 is moved by being driven by the above-described upper mold drive mechanism 34.

Materials for forming the lower mold 31 and the upper mold 32 include heat-resistant alloys (stainless alloys, etc.), super steel materials mainly composed of tungsten carbide, various ceramics (silicon carbide, silicon nitride, aluminum nitride, etc.), and carbon. A composite material or the like can be appropriately selected from known materials as a mold for producing a glass molded product. The lower mold 31 and the upper mold 32 may be made of the same material, or may be made of different materials.

The surfaces of the lower mold 31 and the upper mold 32 are preferably covered with a predetermined coating layer from the viewpoint of improving durability and preventing fusion with molten glass. The material of the coating layer is not particularly limited. For example, various metals (chromium, aluminum, titanium, etc.), nitrides (chromium nitride, aluminum nitride, titanium nitride, boron nitride, etc.), oxides (chromium oxide) , Aluminum oxide, titanium oxide, etc.) can be used. The method for forming the coating layer is not particularly limited, and for example, a vacuum deposition method, a sputtering method, a CVD method, or the like can be used.

The lower mold 31 and the upper mold 32 are configured to be heated to a predetermined temperature by a heating mechanism (not shown). The heating mechanism is not particularly limited, but a known heating device 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 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 mechanism.

The lower mold drive mechanism 33 receives a command from the control unit 60 and moves the lower mold 31 in the DR1 direction (horizontal direction) indicated by an arrow in FIGS. As a result, the lower mold 31 received the position for receiving the molten glass lump 71 falling from the reservoir receiving member 41 (dropping position P1) and the position for performing pre-pressurization (pre-pressurization position P2). A position facing the upper mold 32 for molding the molten glass lump 71 (molding position P3), a position for taking out the glass molded product (takeout position P4), and a position for cooling (cooling position P5) ) And a position for confirming the state (confirmation position P6). As the lower mold drive mechanism 33, various types can be used. For example, the lower mold drive mechanism 33 includes a turntable 36 as shown in FIG. 4 and a drive source for driving the turntable 36. In addition, as a drive source mentioned above, a servo motor, an air cylinder, a hydraulic cylinder, a linear motor, a stepping motor, or a combination thereof can be preferably used.

The upper mold drive mechanism 34 receives a command from the control unit 60 and moves the upper mold 32 in the DR2 direction (vertical direction) indicated by an arrow in FIG. As a result, the upper mold 32 reciprocates between a vertically upper position and a vertically lower position, and the upper mold 32 and the lower mold 31 approach and separate from each other. Of these, the vertically lower position is a position for pressure-molding the molten glass with the lower mold 31. Various types can be used as the upper mold drive mechanism 34. Preferably, a servo motor, an air cylinder, a hydraulic cylinder, a linear motor, a stepping motor, or a combination thereof can be used.

Modes for controlling the upper mold drive mechanism 34 by the control unit 60 include a mode for controlling the position of the upper mold 32 (position control mode), and a mode for controlling the load applied to the upper mold 32 (load control mode). It is preferable that these two control modes can be switched. It is preferable that the upper mold drive mechanism 34 is configured to be capable of pressure-molding molten glass using the upper mold 32 with a pressing force of a maximum of 3 tons.

The reservoir receiving part 40 includes a reservoir receiving member 41 and a reservoir receiving member drive mechanism 42. The reservoir receiving member 41 includes a pair of rotating

members

41A and 41B (see FIG. 5 and the like) configured to be openable and closable, and moves by being driven by the above-described reservoir receiving member driving mechanism 42. , Switching between a closed state (state shown in FIG. 8 and the like) and an open state (state shown in FIG. 12). The reservoir receiving member 41 is configured to reduce the contact area with the molten glass lump 71 in a state where the molten glass lump 71 is accumulated, and details thereof will be described later.

Examples of the material for forming the reservoir receiving member 41 include a heat-resistant alloy (stainless alloy, etc.), a super steel material mainly composed of tungsten carbide, various ceramics (silicon carbide, silicon nitride, aluminum nitride, etc.), and a composite material containing carbon. As a mold for producing a glass molded article, it can be appropriately selected from known materials.

The surface of the reservoir receiving member 41 is preferably covered with a predetermined coating layer from the viewpoint of improving durability and preventing fusion with molten glass. The material of the coating layer is not particularly limited. For example, various metals (chromium, aluminum, titanium, etc.), nitrides (chromium nitride, aluminum nitride, titanium nitride, boron nitride, etc.), oxides (chromium oxide) , Aluminum oxide, titanium oxide, etc.) can be used. The method for forming the coating layer is not particularly limited, and for example, a vacuum deposition method, a sputtering method, a CVD method, or the like can be used.

The reservoir receiving member 41 may be configured to be heated to a predetermined temperature by a heating mechanism (not shown). The heating mechanism is not particularly limited, but a known heating device 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 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 mechanism.

The reservoir receiving member drive mechanism 42 receives a command from the control unit 60, and moves the reservoir receiving member 41 in the DR3 direction (horizontal direction) indicated by an arrow in FIGS. 3 and 4 and also indicated by an arrow in FIG. The reservoir receiving member 41 is rotated in the DR4 direction. Accordingly, the reservoir receiving member 41 is disposed below the outflow pipe 13 indicated by a solid line (broken line in FIG. 4) in FIG. 3 and a reservoir receiving position for receiving the molten glass flow 70, and a broken line ( As shown by a solid line in FIG. 4, the reciprocating motion is performed between the lower mold 31 located at the dropping position P1 and the reservoir receiving release position where the molten glass lump 71 is dropped. Open and close. As the reservoir receiving member drive mechanism 42, various types can be used. Preferably, an air cylinder, a servo motor, a hydraulic cylinder, a linear motor, a stepping motor, or a combination thereof can be used.

Here, in the glass molded product manufacturing apparatus 1 according to the present embodiment, the molten glass supplied below the material supply unit 10 is moved to the lower mold 31 at the dropping position P1 by the movement of the reservoir receiving member 41. It is configured to be supplied. If comprised in this way, since it becomes unnecessary to install the raw material supply part 10 on the turntable 36, the installation freedom degree of the manufacturing apparatus 1 will improve. In addition, when the raw material supply part 10 can be arrange | positioned above the dripping position P1 of the lower mold | type 31, it is not necessary to comprise the reservoir receiving member 41 so that a movement is possible.

The mold release unit 50 includes a suction device 51. The suction device 51 is disposed so as to face the take-out position P4 of the lower mold 31, and its operation is controlled by the control unit 60. As the suction device 51, a known mechanism using vacuum suction can be used.

The control unit 60 controls the operations of the cutter driving mechanism 22, the lower mold driving mechanism 33, the upper mold driving mechanism 34, the reservoir receiving member driving mechanism 42 and the suction device 51 described above. In other words, the control unit 60 cuts the molten glass flow 70 by the cutter 21, moves and opens / closes the reservoir receiving member 41, moves the lower mold 31, moves the upper mold 32, and moves the suction device 51. A series of sequences relating to the production of the glass molded product such as operation timing is controlled.

FIG. 5 is a schematic perspective view of the reservoir receiving member shown in FIG. 3, and FIGS. 6A and 6B are an enlarged plan view and an enlarged sectional view showing the shape of the surface of the reservoir receiving member shown in FIG. Here, FIG. 6B shows a cross section taken along line VIB-VIB shown in FIG. 6A. Next, with reference to these FIG. 5, FIG. 6A and FIG. 6B, the detailed structure of the reservoir receiving member provided in the manufacturing apparatus in the present embodiment will be described.

As shown in FIG. 5, the reservoir receiving member 41 is composed of a pair of rotating

members

41A and 41B each made of a flat plate member. The rotating

members

41A and 41B are arranged so that the upper surfaces 41a of the

rotating members

41A and 41B are positioned in the same horizontal plane in the closed state.

The rotation member 41A is rotatably supported at the end opposite to the side where the rotation member 41B is located, and can rotate in the DR4 direction indicated by an arrow in the drawing with the rotation shaft 41A1 as the rotation center. is there. On the other hand, the rotation member 41B is rotatably supported at the end opposite to the side where the rotation member 41A is located, and rotates in the DR4 direction indicated by an arrow in the figure with the rotation shaft 41B1 as the rotation center. Is possible. The pair of rotating shafts 41A1 and 41B1 are arranged in parallel in the horizontal plane.

Thereby, in the closed state, each of the pair of rotating

members

41A and 41B rotates downward around the rotation shafts 41A1 and 41B1, respectively, so that the reservoir receiving member 41 is switched to the open state.

As shown in FIG. 5, FIG. 6A and FIG. 6B, a plurality of grooves 41b are provided on the upper surface 41a of each of the

rotating members

41A and 41B. The plurality of grooves 41b are in a state where the molten glass lump 71 is accumulated and received by the reservoir receiving member 41 (that is, the molten glass lump is formed by the upper surfaces 41a of the pair of rotating

members

41A and 41B of the reservoir receiving member 41 in the closed state). 71), the contact area between the molten glass lump 71 and the reservoir receiving member 41 is reduced, thereby forming minute irregularities on the upper surface 41a. Yes.

The plurality of grooves 41b are provided in a matrix so as to be orthogonal to the upper surfaces 41a of the

rotating members

41A and 41B, and the horizontal width W1 and the vertical width W2 of each of the plurality of grooves 41b are both 0. .3 [mm] or less is preferable, and the depth D of each of the plurality of grooves 41b is preferably set to 0.1 [mm] or more and 3.0 [mm] or less. Of the plurality of grooves 41b, distances (arrangement intervals) I1 and I2 between adjacent grooves are preferably set to 0.1 [mm] or more and 5.0 [mm] or less.

With this configuration, since the molten glass lump 71 has a predetermined glass viscosity, each of the rotating members 41 </ b> A and 41 </ b> B is in a state where the molten glass lump 71 is accumulated and received by the accumulation receiving member 41. However, it comes into contact with the molten glass lump 71 only on the upper surface 41a, and does not contact the molten glass lump 71 at the portion where the groove 41b is located.

As a result, the contact area between the molten glass lump 71 and the reservoir receiving member 41 in a state where the molten glass lump 71 has been collected and received by the reservoir receiving member 41, the molten glass lump 71 is viewed along the vertical direction in this state. In this case, the area can be made smaller than the area defined by the outline of the molten glass lump 71, and the above-described contact area can be reduced.

Note that the contact area described above is preferably 50 [%] or less, more preferably 25 [%] or less, more preferably 10 [%] of the area defined by the outline of the molten glass block 71. It is as follows. The contact area can be adjusted by appropriately changing the horizontal width W1, vertical width W2, depth D, and arrangement intervals I1 and I2 of the plurality of grooves 41b described above.

FIG. 7 is a diagram showing a manufacturing flow according to the method for manufacturing a glass molded product in the embodiment of the present invention. 8 to 17 are diagrams showing a predetermined step in the steps shown in FIG. 4 or a state before and after the predetermined step. Next, with reference to these FIG. 7 thru | or FIG. 17, the manufacturing method of the glass molded product in this Embodiment is demonstrated in order. In addition, the manufacturing method of the glass molded product in this Embodiment shown below is based on what is called a direct press method, and can be suitably implemented using the manufacturing apparatus 1 of the glass molded product in this Embodiment mentioned above. Moreover, the manufacturing method of the glass molded product in this Embodiment of this invention is a thing in which a several glass product is manufactured sequentially by repeating the series of processes mentioned later.

In the method for manufacturing a glass molded product in the present embodiment, the lower mold 31 and the upper mold 32 are each preheated to a predetermined temperature by the heating mechanism described above. Here, the predetermined temperature means a temperature at which a good transfer surface can be formed on the glass molded product.

Generally, if the temperature of the lower mold 31 and the upper mold 32 is too low, it becomes difficult to form a highly accurate transfer surface. On the other hand, if the temperature of the lower mold 31 and the upper mold 32 is excessively increased, it is easy for fusion to occur between the molten glass and the life of the lower mold 31 and the upper mold 32 is shortened. This is not preferable because it may cause

Usually, the temperature of the lower mold 31 and the upper mold 32 is set in the range of (Tg−100) [° C.] to (Tg + 100) [° C.] with respect to the glass transition point Tg [° C.] of the glass material to be pressure-molded. To do. Actually, an appropriate temperature is determined in consideration of various conditions such as the type of glass material, the shape and size of the glass molded product, the forming material of the lower mold 31 and the upper mold 32, and the type of protective film. The heating temperature of the lower mold 31 and the upper mold 32 may be the same temperature or different temperatures.

In the method for producing a glass molded product in the present embodiment, the lower mold 31 and the upper mold 32 are heated to a predetermined temperature, and then the molten glass in a high temperature state is pressure-molded using the lower mold 31 and the upper mold 32. Therefore, a series of processes to be described later can be performed while keeping the temperature of the lower mold 31 and the upper mold 32 constant. Furthermore, a plurality of glass molded articles can be manufactured sequentially while keeping the temperatures of the lower mold 31 and the upper mold 32 constant. Therefore, since it is not necessary to repeat heating and cooling of the lower mold 31 and the upper mold 32 every time one glass molded article is manufactured, a plurality of glass molded articles can be manufactured efficiently in an extremely short time.

Here, keeping the temperatures of the lower die 31 and the upper die 32 constant means that the target set temperature in the temperature control for heating the lower die 31 and the upper die 32 is kept constant. Therefore, it is not intended to prevent even the temperature fluctuations of the lower mold 31 and the upper mold 32 due to the contact of the molten glass or the like during the execution of each process described later, and such temperature fluctuations are permissible.

Further, in the method of manufacturing a glass molded product in the present embodiment, when a heating mechanism for heating the reservoir receiving member 41 is provided, the reservoir receiving member 41 is also heated to a predetermined temperature in advance by the heating mechanism. Here, the predetermined temperature means that a good transfer surface can be formed on the glass molded product by the lower mold 31 and the upper mold 32 after the molten glass collected and received by the reservoir receiving member 41 is dropped onto the lower mold 31. It means temperature.

If the temperature of the reservoir receiving member 41 is too low, a large temperature distribution is generated in the molten glass, and a negative influence that cannot be ignored in the press molding by the lower mold 31 and the upper mold 32 occurs. On the other hand, it is not preferable that the temperature of the reservoir receiving member 41 is excessively high because fusion may easily occur with the molten glass or the life of the reservoir receiving member 41 may be shortened.

The temperature of the reservoir receiving member 41 may be set in the range of (Tg−300) [° C.] or more and (Tg−50) [° C.] or less with respect to the glass transition point Tg [° C.] of the glass material to be pressure-molded. Actually, an appropriate temperature is determined in consideration of various conditions such as the type of glass material, the shape and size of the glass molded product, the forming material of the reservoir receiving member 41, and the type of protective film.

As described above, when the molten glass in a high temperature state is stored in the reservoir receiving member 41 after the reservoir receiving member 41 is heated to a predetermined temperature, the temperature of the reservoir receiving member 41 is kept constant. A series of processes described below can be performed as it is. Furthermore, a plurality of glass molded products can be manufactured sequentially while keeping the temperature of the reservoir receiving member 41 constant. Therefore, since it is not necessary to repeat heating and cooling of the reservoir receiving member 41 every time one glass molded product is manufactured, a plurality of glass molded products can be efficiently manufactured in a very short time.

Here, keeping the temperature of the reservoir receiving member 41 constant means that the target set temperature in the temperature control for heating the reservoir receiving member 41 is kept constant. Therefore, it is not intended to prevent even the temperature fluctuation of the reservoir receiving member 41 due to the contact of the molten glass or the like during the execution of each process to be described later, and such temperature fluctuation is acceptable.

First, as shown in FIG. 7, the lower mold 31 is placed at the dropping position P1 (see FIG. 3 and the like) (step S1). Specifically, when the control unit 60 detects the current position of the lower mold 31 and detects that the lower mold 31 is disposed at a position other than the dropping position P1, the lower mold drive mechanism 33 is driven. As a result, the lower mold 31 is moved to the dropping position P1. When the control unit 60 detects the current position of the lower mold 31 and detects that the lower mold 31 is disposed at the dropping position P1, the lower mold 31 is not moved.

Next, as shown in FIG. 7, the reservoir receiving member 41 is disposed at the reservoir receiving position (step S2). FIG. 8 is a view showing a state after the step of arranging the reservoir receiving member shown in FIG. 7 at the reservoir receiving position.

Specifically, when the control unit 60 detects the current position of the reservoir receiving member 41 and detects that the reservoir receiving member 41 is disposed at a position other than the reservoir receiving position, the reservoir receiving member drive mechanism By driving 42, the reservoir receiving member 41 is moved to the reservoir receiving position. When the control unit 60 detects the current position of the reservoir receiving member 41 and detects that the reservoir receiving member 41 is disposed at the reservoir receiving position, the reservoir receiving member 41 is not moved.

Thereby, as shown in FIG. 8, the reservoir receiving member 41 arranged at the reservoir receiving position is positioned vertically below the outflow pipe 13. From the outlet 13a of the outflow pipe 13, a molten glass flow 70 continuously flows out vertically downward (in the direction of arrow A shown in the figure), and the length of the molten glass flow 70 is proportional to time. Gradually becomes longer. The reservoir receiving member 41 disposed at the reservoir receiving position is maintained in a closed state by the reservoir receiving member driving mechanism 42.

Next, as shown in FIG. 7, the molten glass flow 70 is cut by the cutter 21 (step S3). FIG. 9 is a diagram showing a step of cutting the molten glass flow shown in FIG. 7 with a cutter.

As shown in FIG. 9, when the predetermined time elapses after the reservoir receiving member 41 is disposed at the reservoir receiving position, the lower end of the molten glass flow 70 is changed to the reservoir receiving member 41 (more specifically, the rotating member 41A). , 41B), the molten glass flow 70 is collected and received by the reservoir receiving member 41, and then the volume of the molten glass flow 70 located below the cutting position by the cutter 21 is a predetermined volume ( That is, at the time when the volume required for manufacturing the glass molded product is reached, the control unit 60 detects this and drives the cutter driving mechanism 22 to drive the cutter 21 in the direction of arrow B shown in the figure. Then, the molten glass stream 70 is cut.

Next, as shown in FIG. 7, the molten glass lump 71 is collected and received by the reservoir receiving member 41 (step S4). FIG. 10 is an enlarged schematic cross-sectional view of the contact portion between the molten glass lump and the reservoir receiving member in the step of receiving the molten glass lump shown in FIG. 7 by the reservoir receiving member.

After the molten glass flow 70 is cut, the cut molten glass lump 71 is separated from the molten glass flow 70, and the separated molten glass lump 71 is stored in the reservoir member 41 (more specifically, the rotating member 41A). , 41B by the upper surface 41a).

Here, as described above, since the reservoir receiving member 41 is provided with minute irregularities on the surface thereof, as shown in FIG. 10, a pair of rotating members 41A constituting the reservoir receiving member 41, The molten glass lump 71 comes into contact with the reservoir receiving member 41 only on the upper surface 41a of 41B, and the molten glass lump 71 does not contact the reservoir receiving member 41 at the portion where the groove 41b is located. Therefore, the contact area between the molten glass lump 71 and the reservoir receiving member 41 is reduced as compared with the case where a flat shaped reservoir receiving member is used that does not have minute irregularities on the surface. Abrupt cooling can be suppressed, and a large temperature distribution in the pooled molten glass lump 71 (that is, a large temperature difference between the upper surface and the lower surface of the molten glass lump 71) can be reduced.

Next, as shown in FIG. 7, the reservoir receiving member 41 is disposed at the reservoir receiving release position (step S5). FIG. 11 is a view showing a state after the step of arranging the reservoir receiving member shown in FIG. 7 at the reservoir receiving release position.

Specifically, the control unit 60 drives the reservoir receiving member driving mechanism 42 to move the reservoir receiving member 41 to the reservoir receiving release position. Accordingly, as shown in FIG. 11, the reservoir receiving member 41 disposed at the reservoir receiving release position is positioned above the lower mold 31 disposed at the dropping position P1.

Next, as shown in FIG. 7, a molten glass lump 71 is dropped onto the lower mold 31 (step S6). FIG. 12 is a diagram showing a step of dropping the molten glass lump shown in FIG. 7 onto the lower mold.

Specifically, as shown in FIG. 12, the control unit 60 switches the reservoir receiving member 41 from the closed state to the open state by driving the reservoir receiving member driving mechanism 42. As a result, the pair of rotating

members

41A and 41B constituting the reservoir receiving member 41 rotate in the DR4 direction indicated by an arrow in the drawing, and accordingly the molten glass lump 71 moves vertically downward (the arrow shown in the drawing). Drops toward (C direction). The dropped molten glass lump 71 is then received by the mold surface 31a of the lower mold 31, and the molten glass lump 71 received by the mold surface 31a of the lower mold 31 spreads wet on the mold surface 31a. The temperature of the molten glass block 71 dropped on the lower mold 31 is preferably 800 [° C.] or more and 900 [° C.] or less.

Next, as shown in FIG. 7, the lower mold 31 is moved to the pre-pressurization position P2 (see FIG. 4), and the pre-pressurization of the molten glass block 71 is performed (step S7). FIG. 13 is a view showing a state after the step of pre-pressing the molten glass lump by moving the lower mold shown in FIG. 7 to the pre-pressurization position.

Specifically, the control unit 60 drives the lower mold drive mechanism 33 to move the lower mold 31 to the pre-pressurization position P2, and then pre-pressurizes the molten glass lump 71 using a mold (not shown). Is done. The pre-pressing is for adjusting the shape of the molten glass lump 71 dripped onto the lower mold 31 to a shape suitable for pressure molding described later. As a result, as shown in FIG. On the surface 31a, the molten glass lump 71 is stretched thinly to some extent.

Next, as shown in FIG. 7, the lower mold 31 is moved to the molding position P3 (see FIG. 3 and the like) (step S8). Specifically, the control unit 60 drives the lower mold drive mechanism 33 to move the lower mold 31 to the molding position P3. As a result, the lower mold 31 moved to the molding position P3 is arranged to face the upper mold 32 along the vertical direction.

Next, as shown in FIG. 7, the upper mold 32 is lowered (step S8). FIG. 14 is a diagram showing a step of lowering the upper mold shown in FIG.

As shown in FIG. 14, the upper die 32 is lowered vertically (in the direction of arrow D shown in the drawing) so as to approach the lower die 31. Specifically, the control unit 60 drives the upper mold drive mechanism 34 to lower the upper mold 32 in a direction approaching the lower mold 31.

Next, as shown in FIG. 7, the molten glass lump 71 is filled into the cavity 35 (step S9). FIG. 15 is a diagram showing a process of filling the molten glass block into the cavity shown in FIG.

As shown in FIG. 15, when the upper mold 32 approaches the lower mold 31, the molten glass block 71 located on the mold surface 31 a of the lower mold 31 comes into contact with the mold surface 32 a of the upper mold 32. As 32 continues to descend, the molten glass lump 71 is pressed and spread by the mold surface 32a. The expanded molten glass block 71 spreads into the cavity 35 defined by the lower mold 31 and the upper mold 32 when the upper mold 32 comes into contact with the lower mold 31 and stops descending. The inside 35 is filled with the molten glass 72 and the molten glass 72 is pressed by the lower mold 31 and the upper mold 32 at a predetermined pressure.

Note that the state in which the molten glass 72 is pressurized by the lower mold 31 and the upper mold 32 is maintained for a predetermined time. As a result, the molten glass 72 is cured in a state where the shapes of the mold surface 31a of the lower mold 31 and the mold surface 32a of the upper mold 32 are transferred to the molten glass 72, whereby the glass molded product 80 (see FIG. 16). ) Is formed.

The temperature of the molten glass 72 at the start of the pressure treatment is preferably set to (Tg + 50) [° C] or more and (Tg + 200) [° C] or less with respect to the glass transition point Tg [° C]. For example, when Tg is 540 [° C.], the temperature of the molten glass 72 immediately before pressing may be set to 680 [° C.]. In order for the molten glass 72 to satisfy such a temperature condition, the temperature of the upper mold 32 is set to (Tg-60) [° C.] or more and (Tg-20) [° C.] or less, and the temperature of the lower mold 31 is ( 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 32 may be set to 500 [° C.] and the temperature of the lower die 31 may be set to 520 [° C.].

Next, as shown in FIG. 7, the upper mold 32 is raised (step S11). FIG. 16 is a diagram showing a step of raising the upper mold shown in FIG.

As shown in FIG. 16, the upper mold 32 is raised vertically upward (in the direction of arrow E shown in the figure) so as to be separated from the lower mold 31. Specifically, the control unit 60 drives the upper mold drive mechanism 34 to raise the upper mold 32 in a direction away from the lower mold 31. Thereby, the upper mold | type 32 isolate | separates from the glass molded product 80 formed when the molten glass 72 was pressure-molded.

The temperature of the glass molded product 80 at the time of starting the ascending operation for separating the upper mold 32 from the glass molded product 80 is the glass molded by the mold surface 32a of the upper mold 32 with respect to the glass transition point Tg [° C.]. It is preferably set to (Tg−200) [° C.] or more and (Tg−30) [° C.] or less so that the surface of the molded product 80 can be sufficiently cured. For example, when Tg is 540 [° C.], the temperature of the glass molded product 80 when the upper mold 32 starts to rise may be set to 340 [° C.] or more and 510 [° C.] or less.

Next, as shown in FIG. 7, the lower mold 31 is moved to the take-out position P4 (see FIG. 3 and the like) (step S12). Specifically, the control unit 60 drives the lower mold drive mechanism 33 to take out the lower mold 31 and move it to the position P4. As a result, the lower mold 31 moved to the take-out position P4 is arranged at a position that does not face the upper mold 32 along the vertical direction.

Next, as shown in FIG. 7, the glass molded product 80 is taken out (step S13). In the take-out position P4, the glass molded product 80 is taken out from the lower mold 31 using the suction device 51 using vacuum suction.

FIG. 17 is a view showing a state of the glass molded product after the glass molded product taking-out process shown in FIG. As shown in FIG. 17, the glass molded product 80 after being taken out is molded into a predetermined shape by the lower mold 31 and the upper mold 32. In this embodiment, the glass molded product 80 is the display described above. The cover glass 110 included in the apparatus 100 is obtained. In this case, the molding surface 80 a formed by the mold surface 31 a of the lower mold 31 becomes the front surface 110 a of the cover glass 110, and the molding surface 80 b formed by the mold surface 32 a of the upper mold 32 is formed by the cover glass 110. It becomes the back surface 110b. Here, the glass molded product 80 after removal may be subjected to cutting, cutting, polishing, or the like as necessary.

The lower mold 31 after taking out the glass molded product 80 is cooled at the cooling position P5 by moving in the order of the cooling position P5 and the confirmation position P6, and after confirming the state at the confirmation position P6, It will again be placed at the dropping position P1.

As described above, the glass molded product 80 is manufactured using the glass molded product manufacturing method and the manufacturing apparatus 1 according to the present embodiment, so that the high-temperature molten glass lump 71 and the reservoir receiving member 41 are in contact with each other. The contact area of the part to perform can be reduced. Therefore, a large temperature distribution is not generated in the molten glass lump 71 when it is dropped on the lower mold 31, and the molten glass lump 71 has a more uniform temperature distribution. The high temperature state is maintained not only on the upper surface of the molten glass lump 71 that is in contact with 32, but also on the lower surface of the molten glass lump 71 that is in contact with the lower mold 31. As a result, at the time of pressure molding, not only the portion that contacts the mold surface 32a of the upper mold 32 but also the portion that contacts the mold surface 31a of the lower mold 31, the glass curing proceeds more uniformly and uniformly throughout. As a result, the transferability at these portions is greatly improved.

Moreover, since the contact area of the part which the high temperature molten glass lump 71 and the reservoir receiving member 41 contact can be reduced, the amount of heat conducted from the molten glass lump 71 to the reservoir receiving member 41 is reduced, and the temperature of the reservoir receiving member 41 is reduced. The rise can be suppressed. Therefore, the occurrence of fusion can be prevented and the surface of the reservoir receiving member 41 can be prevented from being oxidized. As a result, the life of the reservoir receiving member 41 can be extended, the increase in running cost of the manufacturing apparatus 1 and the decrease in the operating rate of the manufacturing apparatus can be remarkably suppressed, and the surface of the reservoir receiving member 41 can be reduced. It is also possible to suppress a decrease in the yield of the glass molded product 80 generated by oxidation and roughening.

Furthermore, since the temperature of the molten glass lump 71 dripped onto the lower mold 31 can be lowered substantially uniformly to a desired temperature, the lower mold is compared with the case where the molten glass lump is directly dropped onto the lower mold. The load on 31 can also be suppressed. Therefore, the lifetimes of the lower mold 31 and the upper mold 32 used for pressure molding are also dramatically increased, and an increase in running cost of the manufacturing apparatus 1 and a decrease in operating rate of the manufacturing apparatus can be suppressed.

Therefore, by manufacturing the glass molded product 80 using the glass molded product manufacturing method and the manufacturing apparatus 1 in the present embodiment, the glass molded product 80 can be manufactured efficiently and with high accuracy.

18A, FIG. 18B, FIG. 19A, and FIG. 19B are an enlarged plan view and an enlarged cross-sectional view showing another example and still another example of the shape of the surface of the reservoir receiving member shown in FIG. Here, FIG. 18B and FIG. 19B represent cross sections along the line XVIIIB-XVIIIB shown in FIG. 18A and the line XIXB-XIXB shown in FIG. 19A, respectively. Next, with reference to FIG. 18A, FIG. 18B, FIG. 19A, and FIG. 19B, another example and still another example of the reservoir receiving member provided in the manufacturing apparatus in the present embodiment will be described.

As shown in FIGS. 18A and 18B, a plurality of holes 41c are provided on the upper surface 41a of each of the

rotating members

41A and 41B of the reservoir receiving member 41 according to another example. The plurality of holes 41c are provided so as to reduce the contact area between the molten glass lump 71 and the reservoir receiving member 41 in a state where the molten glass lump 71 is accumulated and received by the reservoir receiving member 41. As a result, minute irregularities are formed on the upper surface 41a.

The plurality of holes 41c are provided in an array on the upper surface 41a of each of the

rotating members

41A and 41B, and the horizontal width W1 and the vertical width W2 of each of the plurality of holes 41c are both 0.3 [mm]. Preferably, the depth D of each of the plurality of holes 41c is preferably set to 0.1 [mm] or more and 3.0 [mm] or less. Of 41c, distances (arrangement intervals) I1 and I2 between adjacent grooves are preferably set to 0.1 [mm] or more and 5.0 [mm] or less.

Even in such a configuration, each of the

rotating members

41A and 41B is in contact with the molten glass lump 71 only on the upper surface 41a in a state where the molten glass lump 71 is accumulated and received by the accumulation receiving member 41. Thus, the molten glass lump 71 is not contacted at the portion where the hole 41c is located. Therefore, the contact area described above can be reduced, and the same effects as those of the embodiment of the present invention described above can be obtained.

As shown in FIGS. 19A and 19B, the upper surface 41a of each of the

rotating members

41A and 41B of the reservoir receiving member 41 according to still another example is provided with a plurality of concave portions 41d having a quadrangular pyramid shape. The upper surface 41a is defined by the tip of the protrusion. The plurality of concave portions 41d are provided so that the contact area between the molten glass lump 71 and the reservoir receiving member 41 is reduced in a state where the molten glass lump 71 is accumulated and received by the reservoir receiving member 41. As a result, minute irregularities are formed on the upper surface 41a.

The plurality of recesses 41d are provided so as to be arranged on the upper surfaces 41a of the

rotating members

41A and 41B, and the size, depth, and arrangement pitch of the plurality of recesses 41d are set to appropriate dimensions.

Even in such a configuration, in the state in which the molten glass lump 71 is stored and received by the storage receiving member 41, each of the

rotating members

41A and 41B has an upper surface 41a (in this case, the upper portion of the recess 41d). Only in the portion where the lower portion of the concave portion 41d is located, and not in contact with the molten glass chunk 71. Therefore, the contact area described above can be reduced, and the same effects as those of the embodiment of the present invention described above can be obtained.

Next, the glass molded product is actually manufactured, and the surface temperature of the reservoir receiving member at the time of manufacturing, the surface temperature of the molten glass lump dripped onto the lower mold, and the surface state of the molded surface of the manufactured glass molded product are confirmed. Thus, a verification test for verifying the effect of the present invention will be described. In the verification test, the glass molded products manufactured by using the glass molded product manufacturing apparatus and manufacturing method according to the above-described embodiment of the present invention are designated as Examples 1 to 3, respectively. The glass molded product manufactured without using the manufacturing apparatus and manufacturing method of the glass molded product according to a form was made into the comparative example. FIG. 20 is a table showing the results of the verification test.

The glass molded articles according to Examples 1 to 3 are manufactured using the reservoir receiving member that is provided with a plurality of grooves on the surface and has minute irregularities formed on the surface as shown in the above-described embodiment of the present invention. It has been done. Here, the glass molded articles according to Examples 1 to 3 were configured such that the contact area with the molten glass lump was different by appropriately adjusting the vertical width, horizontal width, depth, and arrangement interval of the plurality of grooves described above. Each of the reservoir receiving members is manufactured. In Example 1, a reservoir receiving member having a contact area ratio reduced to 10% is used, and in Example 2, the reservoir receiving member is used. The contact area ratio was reduced to 25 [%], and in Example 3, a contact receiving member with a contact area ratio reduced to 50 [%] was used.

On the other hand, the glass molded article according to the comparative example is manufactured using a reservoir receiving member having a planar surface on which minute irregularities are not formed. The reservoir receiving member used in the comparative example is a molten glass. The ratio of the contact area with the lump is 100 [%].

In addition, in manufacturing the glass molded products according to Examples 1 to 3 and the comparative example, manufacturing conditions other than the above-described points were set in common.

Alumina silicate glass was used as the glass material. The glass transition point Tg of the glass material is 540 [° C.], and the linear expansion coefficient α is 98 [× 10 ⁻⁷ / ° C.] in the range of 100 [° C.] to 300 [° C.].

The temperature of the molten glass immediately before the start of pressure molding is adjusted to 950 [° C.], the temperature of the lower die is set to 550 [° C.], and the temperature of the upper die is set to 520 [° C.]. did. The temperature of the reservoir receiving member was set to 300 [° C.], and the time for receiving the molten glass lump using the reservoir receiving member was set to 10 [seconds]. The pre-pressurizing time was set to 2 [seconds], and the temperature of the pre-pressing mold during pre-pressing was set to 200 [° C.]. Furthermore, the pressure forming time was set to 8 [seconds], and the pressure was set to 2 [t]. In addition, the shape of the manufactured glass molded product was made into the substantially flat plate shape whose length and width are 150 [mm] x 80 [mm] and whose thickness is 4 [mm].

Here, the surface temperature of the reservoir receiving member is a value obtained by measuring the temperature of the upper surface of the reservoir receiving member immediately after dropping the molten glass block by switching the reservoir receiving member from the closed state to the open state by infrared thermography. The temperature of the molten glass block is the temperature of the upper and lower surfaces of the molten glass block immediately after dropping the molten glass block from the reservoir receiving member (that is, the temperature of the upper and lower surfaces of the molten glass block being dropped). It is the value measured by.

In addition, for manufactured glass molded products, P (Peak) -V (Valley) value (maximum) along a straight line passing through the midpoint of the short side of the back surface (that is, the molding surface formed by the inner upper mold) The surface condition was confirmed by measuring the difference between the height and the maximum depth. In the evaluation of the surface condition, when the PV values of a plurality of samples are all within 30 [μm] or less, “excellent” is set, and the PV values of some of the samples are Although the PV value of a plurality of samples is all within 50 [μm] even though it exceeds 30 [μm], the PV value of a part of the plurality of samples is regarded as “good”. Is more than 50 [μm], but all samples have PV values within 80 [μm] or less, “Yes”, and all samples have PV values of 80 [μm]. The case where the value is exceeded is determined as “impossible”.

As shown in FIG. 20, in Example 1, the surface temperature of the reservoir receiving member immediately after dropping of the molten glass lump is suppressed to 410 [° C.], and the temperature on the upper surface side of the molten glass lump immediately after dropping is 1100. It was [° C.], and it was confirmed that the temperature on the lower surface side of the molten glass lump immediately after dropping was maintained at 910 [° C.]. That is, the maximum temperature difference in the falling molten glass block is 190 [° C.]. Moreover, the evaluation result of the surface state of the glass molded product according to Example 1 was “excellent”.

Moreover, in Example 2, the surface temperature of the reservoir receiving member immediately after the molten glass lump is dropped is suppressed to 450 [° C.], and the temperature on the upper surface side of the molten glass lump immediately after the dropping is 1100 [° C.]. It was confirmed that the temperature on the lower surface side of the molten glass lump immediately after dropping was maintained at 900 [° C.]. That is, the temperature difference in the molten glass lump falling is 200 [° C.] at the maximum. Moreover, the evaluation result of the surface state of the glass molded article which concerns on Example 2 was "good".

Furthermore, in Example 3, the surface temperature of the reservoir receiving member immediately after dropping of the molten glass lump is suppressed to 500 [° C.], and the temperature on the upper surface side of the molten glass lump immediately after dropping is 1100 [° C.]. It was confirmed that the temperature on the lower surface side of the molten glass lump immediately after dropping was maintained at 880 [° C.]. That is, the maximum temperature difference in the molten glass lump is 220 [° C.]. In addition, the evaluation result of the surface state of the glass molded article according to Example 3 was “OK”.

On the other hand, in the comparative example, the surface temperature of the reservoir receiving member immediately after dropping the molten glass lump rises to 560 [° C.], and the temperature on the upper surface side of the molten glass lump immediately after dropping is 1100 [° C.] It was confirmed that the temperature of the lower surface side of the molten glass lump immediately after that decreased to 840 [° C.]. That is, the maximum temperature difference in the falling molten glass block is 260 [° C.]. Moreover, the evaluation result of the surface state of the glass molded article which concerns on a comparative example was "impossible".

As a result of the above verification test, the smaller the contact area between the molten glass lump and the reservoir receiving member, the lower the temperature distribution generated in the molten glass lump, thereby improving the surface accuracy of the glass molded product produced, It is understood that the temperature rise of the reservoir receiving member can be suppressed. Therefore, experimentally, it is possible to manufacture a glass molded product efficiently and with high accuracy by manufacturing the glass molded product using the manufacturing method and manufacturing apparatus of the glass molded product in the above-described embodiment of the present invention. Was also confirmed.

In the embodiment of the present invention described above, the description has been given by exemplifying a case in which a pair of rotating members is rotated as a reservoir receiving member and is switched from a closed state to an open state. The configuration of the reservoir receiving member is not limited to this, and it may be configured by three or more rotating members, or may be configured by a single rotating member. Further, as the reservoir receiving member, a member that slides to switch from the closed state to the open state may be used, or the molten glass lump that has received the reservoir is dropped by rotating so that the top and bottom are reversed without opening and closing. A thing may be used.

In the above-described embodiment of the present invention, the case where a pair of molds is used as a mold for pressure-molding molten glass has been described as an example, but the number of molds is not limited to this. Alternatively, pressure molding may be performed using three or more molds.

Furthermore, in embodiment of this invention mentioned above, although the cover glass with which a smart phone was equipped was illustrated and demonstrated as a glass molded article manufactured by applying this invention, it is limited to this. For example, the present invention may be applied to the manufacture of cover glasses for other display devices such as tablet terminals, and the manufacture of exterior covers for electronic devices such as mobile computers and digital cameras. The present invention may be applied to the manufacture of lenses and optical recording media.

Thus, the above-described embodiment disclosed herein is illustrative in all respects and is not restrictive. The technical scope of the present invention is defined by the scope of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus, 10 Material supply part, 11 Continuous melting furnace, 12 Nozzle part, 13 Outflow pipe, 13a Outlet, 20 Cutting part, 21 Cutter, 22 Cutter drive mechanism, 30 Molding part, 31 Lower mold, 31a Mold surface, 32 upper mold, 32a mold surface, 33 lower mold drive mechanism, 34 upper mold drive mechanism, 35 cavity, 36 turntable, 40 reservoir receiver, 41 reservoir receiver, 41A, 41B rotating member, 41A1, 41B1 rotating shaft, 41a upper surface, 41b groove, 41c hole, 41d recess, 42 reservoir receiving member drive mechanism, 50 mold release part, 51 adsorption device, 60 control part, 70 molten glass flow, 71 molten glass lump, 72 molten glass, 80 glass molded

product

80a, 80b molding surface, 100 display device, 110 cover glass, 1 0a front surface, 110b back surface, 111 main plate part, 112 side plate part, 113 hole part, 120 exterior plate, 130 circuit board, 131 speaker, 140 display, 142 image display part, P1 drop position, P2 pre-pressurization position , P3 molding position, P4 take-out position, P5 cooling position, P6 confirmation position.

Claims

A step of disposing a reservoir receiving member below the outlet from which the molten glass flow continuously flows out vertically downward;
Separating the molten glass lump from the molten glass stream by cutting the molten glass stream after the molten glass stream is received by the reservoir receiving member;
Dropping the molten glass lump separated and received from the reservoir receiving member;
Receiving the dropped molten glass lump using a mold and press-molding using the mold,
A method for producing a glass molded article, wherein the reservoir receiving member is a member having minute irregularities formed on the surface so as to reduce a contact area between the pooled molten glass lump.
When the contact area between the molten glass lump and the reservoir receiving member in a state where the molten glass lump is accumulated and received by the reservoir receiving member, the molten glass lump is viewed along the vertical direction in the state. The manufacturing method of the glass molded product of Claim 1 which is 50 [%] or less of the area prescribed | regulated by the outline of the said molten glass lump.
2. The glass molded article according to claim 1, wherein the micro unevenness provided in the reservoir receiving member is formed by providing a plurality of grooves on the surface of the reservoir receiving member so as to be orthogonal to each other in a matrix shape. Production method.
The width of each of the plurality of grooves is 0.3 [mm] or less,
The depth of each of the plurality of grooves is 0.1 [mm] or more and 3.0 [mm] or less,
The manufacturing method of the glass molded product of Claim 3 whose distance between adjacent groove | channels is 0.1 [mm] or more and 5.0 [mm] or less among these grooves.
The method for producing a glass molded article according to claim 1, wherein the minute irregularities provided in the reservoir receiving member are formed by providing a plurality of holes in an array on the surface of the reservoir receiving member.
The diameter of each of the plurality of holes is 0.3 [mm] or less,
The depth of each of the plurality of holes is 0.1 [mm] or more and 3.0 [mm] or less,
The manufacturing method of the glass molded product of Claim 5 whose distance between adjacent holes is 0.1 [mm] or more and 5.0 [mm] or less among these holes.
Using a thing that can be opened and closed as the reservoir receiving member,
The molten glass flow is collected and received by the reservoir receiving member in a closed state,
The manufacturing method of the glass molded product in any one of Claim 1 to 6 which drops the said molten-glass lump by switching the said reservoir receiving member from the said closed state to an open state.
The reservoir receiving member is composed of a pair of rotating members each having a rotation center at each of a pair of rotating shafts arranged in parallel in a horizontal plane,
In the step of dropping the molten glass lump, the reservoir receiving member is switched from the closed state to the open state by rotating each of the pair of rotating members downward around the respective rotation axes. The manufacturing method of the glass molded product of Claim 7.
In the step of dropping the molten glass lump, the mold is not disposed below the outlet,
Between the step of cutting the molten glass and the step of dropping the molten glass lump, the reservoir receiving member in a state where the molten glass lump is collected and moved is moved to be disposed above the mold. The manufacturing method of the glass molded product in any one of Claim 1 to 8 further equipped with a process.
A material supply section for continuously flowing a molten glass flow from the outlet toward the vertically downward direction;
A cutting mechanism for cutting the molten glass stream and separating the molten glass mass from the molten glass stream;
Reserving and receiving the molten glass flow, and a reservoir receiving member for dropping the molten glass lump separated and received from the molten glass flow,
A reservoir receiving member driving mechanism for driving the reservoir receiving member to drop the molten glass lump,
A mold for receiving and pressing the molten glass lump;
A mold drive mechanism for moving the mold;
A control unit for controlling the operation of the cutting mechanism, the reservoir receiving member driving mechanism and the mold driving mechanism,
In the reservoir receiving member, minute irregularities are formed on the surface so that the contact area between the molten glass lump and the reservoir received is reduced,
The control unit arranges the reservoir receiving member below the outlet, and then receives the molten glass flow by the reservoir receiving member, and then cuts the molten glass flow from the molten glass flow. The separated molten glass lump is collected and received by the reservoir receiving member, and then the molten glass lump is dropped from the reservoir receiving member, and then the dropped molten glass lump is received using the mold. An apparatus for manufacturing a glass molded product, which controls operations of the cutting mechanism, the reservoir receiving member driving mechanism, and the mold driving mechanism so as to perform pressure molding using the mold.
When the contact area between the molten glass lump and the reservoir receiving member in a state where the molten glass lump is accumulated and received by the reservoir receiving member, the molten glass lump is viewed along the vertical direction in the state. The manufacturing apparatus of the glass molded product of Claim 10 which is 50 [%] or less of the area prescribed | regulated by the outline of the said molten glass lump.
11. The glass molded article according to claim 10, wherein minute irregularities provided in the reservoir receiving member are formed by providing a plurality of grooves on the surface of the reservoir receiving member so as to be orthogonal to each other in a matrix. Manufacturing equipment.
The width of each of the plurality of grooves is 0.3 [mm] or less,
The depth of each of the plurality of grooves is 0.1 [mm] or more and 3.0 [mm] or less,
The manufacturing apparatus of the glass molded product of Claim 12 whose distance between adjacent grooves is 0.1 [mm] or more and 5.0 [mm] or less among these grooves.
The apparatus for producing a glass molded product according to claim 10, wherein the minute unevenness provided in the reservoir receiving member is formed by providing a plurality of holes in an array on the surface of the reservoir receiving member.
The diameter of each of the plurality of holes is 0.3 [mm] or less,
The depth of each of the plurality of holes is 0.1 [mm] or more and 3.0 [mm] or less,
The manufacturing apparatus of the glass molded product of Claim 14 whose distance between adjacent holes is 0.1 [mm] or more and 5.0 [mm] or less among these holes.
The reservoir receiving member can be opened and closed,
The control unit receives the molten glass flow in the reservoir receiving member in the closed state, and then drops the molten glass lump by switching the reservoir receiving member from the closed state to the open state. The apparatus for manufacturing a glass molded product according to any one of claims 10 to 15, which controls an operation of the reservoir receiving member driving mechanism.
The reservoir receiving member is composed of a pair of rotating members each having a rotation center at each of a pair of rotating shafts arranged in parallel in a horizontal plane,
17. The glass molded article according to claim 16, wherein each of the pair of rotating members rotates downward around each rotation axis, whereby the reservoir receiving member is switched from the closed state to the open state. Manufacturing equipment.
The controller moves the reservoir receiving member in a state where the molten glass lump has been collected and received after cutting the molten glass flow and before dropping the molten glass lump. The apparatus for manufacturing a glass molded product according to any one of claims 10 to 17, wherein the operation of the reservoir receiving member driving mechanism is controlled so as to be arranged.