WO2014203636A1

WO2014203636A1 - Molded glass article manufacturing method and manufacturing device

Info

Publication number: WO2014203636A1
Application number: PCT/JP2014/062233
Authority: WO
Inventors: 博久北野
Original assignee: コニカミノルタ株式会社
Priority date: 2013-06-18
Filing date: 2014-05-07
Publication date: 2014-12-24

Abstract

This molded glass article manufacturing method comprises: a step of receiving and accumulating, in a receiving reservoir (32), molten glass (50) that is dripped into the receiving reservoir (32); a step of pushing the molten glass (50) out from an extrusion channel (33) that includes a slit-shaped opening toward the exterior of the receiving reservoir (32) by pushing the molten glass (50) accumulated in the receiving reservoir (32) using a piston (23); and a step of pressure molding the molten glass (50) that is formed into a substantially plate shape by being pushed out from the extrusion channel (33) by sandwiching the same using a molding die from both side in the thickness direction of the glass.

Description

Manufacturing method and manufacturing apparatus for glass molded product

The present invention relates to a glass molded product manufacturing method and a manufacturing apparatus for manufacturing a glass molded product by press-molding molten glass using a die placed opposite to each other based on a so-called direct press method.

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 its front and back surfaces are required to be mirror-finished.

Mirror finish can be realized by polishing the glass blank. However, when mirror finishing is performed in the polishing process, a separate polishing process is required in addition to various processes for manufacturing a glass blank, which complicates the manufacturing process and leads to an increase in manufacturing cost. End up.

Furthermore, 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 periphery of the main plate portion is required. When manufacturing a cover glass having such a complicated three-dimensional shape, it may be difficult to polish the surface due to the shape.

On the other hand, from the viewpoint of simplifying the manufacturing process, a so-called direct press method is proposed in which molten glass is directly pressure-molded into a final shape or a shape close thereto using a mold. When the direct press method is used, there is an advantage that the surface can be finished in a mirror surface or in a state close to it without performing a polishing process on the surface.

For example, Japanese Patent Laid-Open No. 2000-319026 (Patent Document 1) and Japanese Patent Laid-Open No. 2012-214361 disclose a specific manufacturing method in the case of manufacturing a glass molded article by applying the direct press method described above. (Patent Document 2).

In the method for producing a glass molded article disclosed in Patent Document 1, molten glass is supplied to the molding surface of the lower mold, and in this state, the molten glass is sandwiched in the vertical direction using the upper mold and the lower mold. A glass molded product is manufactured by pressure molding.

On the other hand, in the method for producing a glass molded article disclosed in Patent Document 2, the molten glass is dropped, and the dropped molten glass is sandwiched in a horizontal direction using a pair of molds and is pressure-molded. We are going to manufacture glass molded products.

JP 2000-319026 A JP 2012-214361 A

However, unlike the case of resin molding, in glass molding, it is necessary to perform pressure molding while cooling molten glass in a very high temperature of about 1000 [° C.]. The product is easily cracked, warped, cracked, twisted, etc., and its molding is not easy. In particular, when a glass molded product having a complicated three-dimensional shape such as the cover glass described above is manufactured using the direct press method, the problems as described above become prominent and the manufacture becomes extremely difficult.

Generally, since the viscosity of molten glass increases as the temperature decreases, control of the temperature of the molten glass during pressure molding is very important for improving moldability. In particular, when forming a thin cover glass as described above, it is important to improve the formability that the molten glass in the part contacting each of the pair of molds is cured through a substantially equivalent cooling process. Key.

In this regard, when the method for producing a glass molded product disclosed in Patent Document 1 is adopted, the molten glass is in contact with the lower mold prior to the upper mold contacting the molten glass. When the molten glass in the part in contact with the glass is rapidly cooled, a large temperature difference will occur in the molten glass, and not only a glass molded product in a good state can be obtained, but also the molten glass is cured. As the process proceeds rapidly, it may be difficult to form the molten glass into a thin plate shape.

In order to solve this, before a large temperature difference occurs in the molten glass (specifically, at least 3 seconds, preferably within 1 second from the time when the molten glass contacts the lower mold) It is conceivable that the upper mold is brought into contact with the upper mold, but since the dripping direction of the molten glass and the pressurizing direction by the upper mold and the lower mold coincide with each other in the vertical direction, the upper mold is brought into contact with the molten glass without delay. In reality, it is difficult to adopt such a solution.

On the other hand, when the manufacturing method of the glass molded product disclosed in Patent Document 2 is adopted, the molten glass can be brought into contact with each of the pair of horizontal molds at the same time. Compared with the manufacturing method of a glass molded product, a glass molded product in a better state in terms of moldability can be obtained.

However, when the manufacturing method is adopted, there is a problem that the quality of the manufactured glass molded product varies greatly. This is very difficult to match the shape of the molten glass to be dropped and the dropping position of the molten glass every time, even if it is continuously produced repeatedly using the same production apparatus, This is because it is inevitable that variations occur in various manufacturing conditions in a strict sense.

In addition, when the glass molded product to be manufactured has a non-disc shape (for example, a rectangular plate shape or the above-mentioned substantially box shape), when the molten glass is spread by a pair of molds, A large difference occurs in how the molten glass is spread in a direction parallel to the mold surface, and as a result, there may be a problem that formability is deteriorated at the corner of the glass molded product.

Therefore, the present invention has been made to solve such problems, and is a novel glass based on the direct press method that can efficiently produce a thin glass molded product with excellent moldability. It aims at providing the manufacturing method and manufacturing apparatus of a molded article.

The method for producing a glass molded product according to the present invention includes a step of dropping molten glass, a step of receiving the dropped molten glass in a reservoir receiving portion, and a pressing portion for receiving the molten glass stored in the reservoir receiving portion. The step of extruding the molten glass from the extrusion flow path including the slit-shaped opening toward the outside of the reservoir receiving portion, and being extruded from the extrusion flow path, formed a substantially plate shape. And a step of pressure-molding by sandwiching the molten glass from both sides along the thickness direction using a pair of molding dies.

An apparatus for manufacturing a glass molded product according to the present invention includes a material supply unit that drops molten glass, a reservoir receiving unit that stores the dropped molten glass, and a press that presses the molten glass stored in the reservoir receiving unit. An extrusion passage including a slit-like opening for extruding the molten glass pressed by the pressing portion toward the outside of the reservoir receiving portion, and a substantially plate shape by being extruded from the extrusion passage. And a pair of molding die parts that are pressure-molded by sandwiching the formed molten glass from both sides along the thickness direction.

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

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 schematic cross section of the state which combined the 1st metal mold | die shown in FIG. 3, an auxiliary metal mold | die, a piston, and a 2nd metal mold | die. 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 process of arrange | positioning a 1st metal mold | die and an auxiliary metal mold | die shown in FIG. 5 in a dripping position. It is a figure which shows the process of dripping a molten glass shown in FIG. It is a figure which shows the process of receiving the molten glass shown in FIG. 5 in the reservoir receiving part. It is a figure which shows the process of arrange | positioning the 1st metal mold | die and auxiliary metal mold | die shown in FIG. 5 in a molding position. It is a figure which shows the intermediate stage of the process of pressing a molten glass using a piston shown in FIG. It is a figure which shows the completion | finish stage of the process shown in FIG. 5 which presses a molten glass using a piston. It is a figure which shows the process of pressure-molding molten glass shown in FIG. It is a figure which shows the process of canceling | releases press and pressurization shown in FIG. It is a figure which shows the initial stage of the process of releasing a glass forming body shown in FIG. It is a top view of the glass forming body which shows the cutting position of the process of cutting and removing the non-product area | region of the glass forming body shown in FIG. It is sectional drawing of the glass molded object which shows the cutting position of the process of cut | disconnecting and removing the non-product area | region of the glass molded object shown in FIG.

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 FIG. 1 and FIG. 2, the display device 100 has a flat and substantially rectangular shape as a whole, and covers the cover glass 110, a flat plate-shaped outer plate 120, and the outer plate 120. It mainly includes a circuit board 130 arranged, a display 140 and a speaker 131 mounted on the circuit board 130. The upper surface of the display 140 constitutes an image display unit 142.

The cover glass 110 is made of a glass molded product formed by a direct press method. The cover glass 110 is assembled on the exterior plate 120 from above (along the arrow AR direction in the drawing) so as to seal the internal components represented by the circuit board 130 and the display 140 with the exterior plate 120. Attached.

The cover glass 110 has a substantially box shape, and is provided on the periphery of the main plate portion 111 and a flat main plate portion 111 having a substantially rectangular shape in plan view provided so as to cover the image display portion 142 of the display 140. And four side plate portions 112 fixed to the exterior plate 120 by being continuously provided downward from the four sides. Thereby, the cover glass 110 has the front surface 110a exposed to the outside of the display device 100 after the assembly and the back surface 110b not exposed to the outside.

Further, as shown in FIG. 1, 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.

Note that, in the above, a substantially box-shaped cover having a flat main plate portion 111 having a substantially rectangular shape in plan view and four side plate portions 112 arranged continuously from four sides located at the periphery of the main plate portion 111. Although the case where the glass 110 was used was illustrated, instead of this, a cover glass having a shape in which the side plate portion is continuously provided from only a part of the peripheral edge of the flat plate-like main plate portion may be used. You may use the cover glass which consists only of a flat main plate part without having. Also, the shape of the main plate portion is not limited to a substantially rectangular shape in plan view, and other shapes may be used, and the shape of the side plate portion may be inclined or curved.

The linear expansion coefficient α of the cover glass 110 is preferably 70 [× 10 ⁻⁷ / ° C.] or more and 110 [× 10 ⁻⁷ / ° C.] or less in a temperature range of 100 [° C.] or more and 300 [° C.] or less. 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 glass molded product manufacturing method and manufacturing apparatus in the present embodiment to be described later can be used particularly preferably.

In addition, the front surface 110a and the back surface 110b of the cover glass 110 must both be mirror-finished or close to this state. For this reason, the surface roughness of the front surface 110a and the back surface 110b of the cover glass 110 is preferably set to approximately 0.5 [nm] or more and 20 [nm] or less. The manufacturing method and the manufacturing apparatus of the molded product can form the cover glass 110 so as to satisfy the conditions.

FIG. 3 is a schematic configuration diagram of a glass molded product manufacturing apparatus according to an embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of a state in which the first mold, the auxiliary mold, the piston, and the second mold shown in FIG. 3 are combined. Next, with reference to these FIG. 3 and FIG. 4, the structure of the manufacturing apparatus of the glass molded product in this Embodiment is demonstrated.

The apparatus for producing a glass molded product in the present embodiment produces a cover glass as a glass molded product based on a so-called direct press method, and produces two cover glasses at a time in one production cycle, A plurality of cover glasses are sequentially manufactured by repeating the manufacturing cycle.

As shown in FIG. 3, the glass molded product manufacturing apparatus 1 mainly includes a material supply unit 10, a molding unit 20, and a control unit 40.

The material supply unit 10 is a part for melting a glass material and supplying it to the molding unit 20, and the molding unit 20 is a part for pressure-molding the supplied glass material using a mold. The control unit 40 is a part that controls the operations of the material supply unit 10 and the molding unit 20 described above.

The material supply unit 10 includes a continuous melting furnace 11, a nozzle unit 12, an outflow pipe 13, a cutter 14, and a cutter driving mechanism 15.

The continuous melting furnace 11 melts a glass material and stores the molten glass, 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 at the lower end thereof, and allows the molten glass 50 to flow out continuously from the outflow port vertically downward.

The cutter 14 cuts the molten glass 50 flowing out from the outflow pipe 13 and drops the cut portion, and is driven by the cutter driving mechanism 15 described above. The cutter 14 is composed of a pair of planar shear blades, and the pair of shear blades are abutted below the outflow pipe 13 to cut the molten glass 50.

The cutter driving mechanism 15 receives a command from the control unit 40 and drives the cutter 14. As the cutter driving mechanism 15, various types can be used, but preferably an air cylinder, a servo motor, a hydraulic cylinder, a linear motor, a stepping motor, or the like can be used.

The molding unit 20 includes a first mold 21 as a first member, an auxiliary mold 22 as a second member, a piston 23 as a third member, and a pair of second molds 24 as a fourth member, 24, a first mold drive mechanism 25, an auxiliary mold drive mechanism 26, a piston drive mechanism 27, and a pair of second

mold drive mechanisms

28, 28.

The first mold 21 moves along the horizontal direction by being driven by the first mold drive mechanism 25 described above. The auxiliary mold 22 moves along the horizontal direction and the vertical direction by being driven by the above-described auxiliary mold drive mechanism 26. The piston 23 and the pair of

second molds

24, 24 move along the vertical direction by being driven by the piston drive mechanism 27 and the pair of second

mold drive mechanisms

28, 28, respectively.

As shown in FIG. 4, the first mold 21, the auxiliary mold 22, the piston 23, and the pair of

second molds

24, 24 are combined by placing them close to each other in a pressure molding process described later. As a result, the pressure chamber 31, the pair of

extrusion channels

33, 33, the pair of

cavities

34, 34, and the pair of

escape portions

35, 35 are provided.

The pressing chamber 31 is located at the central portion along the horizontal direction of the first mold 21, the auxiliary mold 22, the piston 23 and the pair of

second molds

24, 24 in a combined state, which will be described later. The reservoir receiving part 32 which receives the molten glass 50 in the reservoir receiving process is included.

The pair of extrusion channels 33 are positioned so as to sandwich the above-described pressing chamber 31 along the horizontal direction. Thereby, each of a pair of extrusion flow path 33 is each connected to the press chamber 31 in the edge part along the horizontal direction.

The pair of

cavities

34 and 34 are positioned so as to sandwich the above-described pressing chamber 31 and the pair of

extrusion channels

33 and 33 along the horizontal direction. Thereby, a pair of

cavities

34 and 34 are matched and connected with a pair of

extrusion flow paths

33 and 33 in the edge part along those horizontal directions, respectively.

The pair of

relief portions

35, 35 are positioned so as to sandwich the above-described pressing chamber 31, the pair of

extrusion channels

33, 33, and the pair of

cavities

34, 34 along the horizontal direction. Thereby, a pair of

relief parts

35 and 35 are matched and connected with a pair of

cavities

34 and 34, respectively in the edge part along those horizontal directions.

The first mold 21 includes a reservoir receiving surface 21a that defines the above-described reservoir receiving portion 32 (pressing chamber 31), and a pair of first flow path forming surfaces 21b that respectively define the above-described pair of

extrusion channels

33 and 33. , 21b, a pair of

first molding surfaces

21c, 21c that respectively define the pair of

cavities

34, 34, and a portion that respectively define the pair of

relief portions

35, 35 described above.

The auxiliary mold 22 includes a portion that defines the above-described pressing chamber 31, a pair of second flow

path forming surfaces

22b and 22b that respectively define the above-described pair of

extrusion flow paths

33 and 33, and the above-described pair of relief portions. 35 and 35, a piston moving passage 22e through which the piston 23 is inserted, and a pair of second

mold moving passages

22f and 22f through which the pair of second molds are inserted. The first mold 21 is disposed vertically above the first mold 21 so as to face the first mold 21.

The piston 23 includes a pressing surface 23 a that defines the pressing chamber 31 described above, and is inserted into a piston moving passage 22 e provided in the auxiliary mold 22 so as to face the first mold 21. It is arranged vertically above the first mold 21.

The pair of

second molds

24, 24 include second molding surfaces 24 c, 24 c that respectively define the pair of

cavities

34, 34 described above, and the pair of second mold movements provided on the auxiliary mold 22. By being respectively inserted into the

passages

22f, 22f, the first mold 21 is disposed vertically above the first mold 21 so as to face the first mold 21.

The portion including the reservoir receiving surface 21a of the first mold 21 corresponds to a reservoir receiving portion 32 that receives the molten glass 50 in a reservoir receiving process described later, and the piston 23 causes the molten glass 50 to be received in a pressing process described later. Corresponds to the pressing part to be pressed. In addition, the portion including the pair of first molding surfaces 21c and 21c of the first mold 21 and the pair of

second molds

24 and 24 are formed by pressure molding the molten glass 50 in a pressure molding process described later. Corresponds to the mold part.

Here, each of the pair of

extrusion channels

33, 33 is configured to have a slit-shaped opening. More specifically, as described above, each of the pair of

extrusion channels

33 and 33 includes the first channel forming surface 21b of the first mold 21 and the second channel forming surface 22b of the auxiliary mold 22. In the state in which the first mold 21 and the auxiliary mold 22 are combined, the cross-sectional shape is configured to have an elongated, substantially rectangular opening having a major axis and a minor axis. Yes. The major axis of the slit-shaped opening is arranged so as to extend along the horizontal direction, and the minor axis of the slit-like opening is arranged so as to extend along the vertical direction. Yes.

In addition, the pressing chamber 31 is a combination of the first mold 21, the auxiliary mold 22, and the piston 23 and the reservoir receiving surface 21 a of the first mold 21 and one of the auxiliary molds 22 as described above. This is defined by the portion and the pressing surface 23 a of the piston 23, but the above-mentioned one of the reservoir receiving surface 21 a of the first mold 21 and the auxiliary mold 22 adjacent to the pair of

extrusion flow paths

33, 33. The portion is configured by

inclined surfaces

21d, 21d, 22d, and 22d having a shape inclined toward the corresponding extrusion flow path 33 side.

On the other hand, each of the pair of

cavities

34 and 34 has a shape corresponding to a cover glass as a glass molded article to be manufactured, and the pair of first molding surfaces 21c and 21c of the first mold 21 and the pair of first moldings. The second mold surfaces 24c and 24c are defined so as to have a substantially box-shaped space. Moreover, the part adjacent to a pair of

extrusion flow paths

33 and 33 mentioned above among a pair of

cavities

34 and 34 is the side in which the main board part is located among the side plate parts of the cover glass as a glass molded article which should be manufactured. Corresponds to a portion forming a non-product region continuously provided from the end located on the opposite side.

The material for forming the first mold 21, the auxiliary mold 22, the piston 23 and the pair of

second molds

24, 24 is a super steel material mainly composed of a heat-resistant alloy (stainless alloy, etc.) or tungsten carbide. In addition, various ceramics (silicon carbide, silicon nitride, aluminum nitride, etc.), composite materials containing carbon, and the like can be appropriately selected from known materials as molds for producing glass molded articles. The first mold 21, the auxiliary mold 22, the piston 23, and the pair of

second molds

24, 24 may be made of the same material, or may be made of different materials. Good.

The surfaces of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of

second molds

24, 24 are provided with a predetermined coating layer from the viewpoint of improving durability and preventing fusion with the glass material. Are preferably covered. The material of the coating layer is not particularly limited. For example, various metals (chromium, aluminum, titanium, etc.), nitrides (chromium nitride, aluminum nitride, titanium nitride, boron nitride, etc.), oxides (chromium oxide) , Aluminum oxide, titanium oxide, etc.) can be used. The method for forming the coating layer is not particularly limited, and for example, a vacuum deposition method, a sputtering method, a CVD method, or the like can be used.

The first mold 21, the auxiliary mold 22, the piston 23, and the pair of

second molds

24, 24 are configured to be heated to a predetermined temperature by a heating means (not shown). The heating means is not particularly limited, but a known heating means can be appropriately selected and used. 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 as the heating means.

As shown in FIG. 3, each of the first mold driving mechanism 25 and the auxiliary mold driving mechanism 26 receives a command from the control unit 40 and receives the first mold in the DR1 direction (horizontal direction) indicated by an arrow in the drawing. 21 and the auxiliary mold 22 are moved. As a result, the first mold 21 and the auxiliary mold 22 are provided with a position for receiving the molten glass 50 vertically below the outflow pipe 13 (dropping position P1) and a piston for press-molding the received molten glass 50 under pressure. 23 and a position facing the pair of second molds 24, 24 (molding position P2) and a position for taking out the glass molded product after pressure molding (takeout position P3). Further, the auxiliary mold drive mechanism 26 receives a command from the control unit 40, and moves the auxiliary mold 22 in the DR3 direction (vertical direction) indicated by an arrow in the drawing at the take-out position P3. Various types can be used as the first mold driving mechanism 25 and the auxiliary mold driving mechanism 26, but a servo motor, an air cylinder, a hydraulic cylinder, a linear motor, a stepping motor, or a combination of these is preferably used. it can.

The piston drive mechanism 27 and the pair of second

mold drive mechanisms

28, 28 receive a command from the control unit 40, respectively, and the piston 23 and the pair of second mold dies in the DR2 direction (vertical direction) indicated by an arrow in the drawing. 24, 24 are moved. As a result, the piston 23 and the pair of

second molds

24, 24 reciprocate between a vertically upper position and a vertically lower position, respectively. Therefore, when the first mold 21 and the auxiliary mold 22 are arranged at the molding position P2, the piston 23 and the pair of

second molds

24, 24 move, so that the piston 23 and the pair of second molds are moved. The

molds

24, 24, the first mold 21 and the auxiliary mold 22 approach and separate from each other. In addition, the position of the vertically downward of these is a position for press-molding the molten glass 50. FIG. Various types can be used as the piston drive mechanism 27 and the pair of second

mold drive mechanisms

28, 28, but preferably a servo motor, an air cylinder, a hydraulic cylinder, a linear motor, a stepping motor, or a combination thereof. Is available.

Here, as a mode for controlling the piston drive mechanism 27 by the control unit 40, a mode for controlling the position of the piston 23 (position control mode), a mode for controlling a load applied to the piston 23 (load control mode), and It is preferable that these two control modes can be switched. The piston drive mechanism 27 is preferably configured to be able to press the molten glass 50 using the piston 23 with a pressing force of a maximum of 3 tons.

Further, as a mode for controlling the pair of second

mold drive mechanisms

28, 28 by the control unit 40, a mode for controlling the position of the pair of second molds 24, 24 (position control mode) and a pair of second molds are controlled. There is a mode (load control mode) for controlling the load applied to the dies 24, 24, and it is preferable that these two control modes can be switched. The pair of second

mold drive mechanisms

28, 28 is configured to be capable of pressure-molding the molten glass 50 with a pressure of up to 3 tons using the pair of second

mold drive mechanisms

28, 28. It is preferable that

The control unit 40 controls the operations of the cutter driving mechanism 15, the first mold driving mechanism 25, the auxiliary mold driving mechanism 26, the piston driving mechanism 27, and the pair of second

mold driving mechanisms

28, 28 described above. That is, the control unit 40 determines the timing of cutting the molten glass 50 by the cutter 14, the timing of movement of the first mold 21, the timing of movement of the auxiliary mold 22, the timing of movement of the piston 23, and a pair of second molds. A series of sequences relating to the production of the glass molded product, such as the timing of movement of 24 and 24, is controlled.

FIG. 5 is a diagram showing a manufacturing flow according to the method for manufacturing a glass molded product in the embodiment of the present invention. 6 to 14, FIG. 15A, and FIG. 15B are diagrams showing predetermined steps among the steps shown in FIG. Next, with reference to these FIG. 6 thru | or FIG. 14, FIG. 15A, and FIG. 15B, the manufacturing method of the glass molded product in this Embodiment is demonstrated in order.

The manufacturing method of the glass molded product in this Embodiment manufactures the cover glass as a glass molded product based on what is called a direct press method, and uses the manufacturing apparatus 1 of the glass molded product in this Embodiment mentioned above. Can be suitably implemented. Moreover, the manufacturing method of the glass molded product in this Embodiment manufactures two cover glasses at once by implementing the series of processes mentioned later in one manufacturing cycle, and the said manufacturing cycle is repeated. Thus, a plurality of cover glasses are sequentially manufactured.

In the method for manufacturing a glass molded product in the present embodiment, the first mold 21, the auxiliary mold 22, the piston 23, and the pair of

second molds

24, 24 described above are each predetermined in advance by the heating means described above. Heated to temperature. Here, the predetermined temperature means a temperature at which a good transfer surface can be formed on a cover glass as a glass molded product.

Generally, if the temperature of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of

second molds

24, 24 is too low, the molten glass 50 is rapidly cooled, and the fluidity of the molten glass 50 is increased. Is impaired, and it becomes difficult to form a highly accurate transfer surface. On the other hand, if the temperature of the first mold 21, the auxiliary mold 22, the piston 23 and the pair of

second molds

24, 24 is excessively increased, fusion with the molten glass 50 occurs. This is not preferable because the life of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of

second molds

24, 24 may be shortened.

Usually, the temperature of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of

second molds

24, 24 is (Tg-100) with respect to the glass transition point Tg [° C.] of the glass material to be pressure-molded. ) Set in the range of [° C.] to (Tg + 100) [° C.]. Actually, the type of glass material, the shape and size of the cover glass, the first mold 21, the auxiliary mold 22, the formation material of the piston 23 and the pair of

second molds

24, 24, the type of protective film, etc. An appropriate temperature is determined in consideration of various conditions. The heating temperature of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of

second molds

24, 24 may be the same temperature or different temperatures.

In the method of manufacturing a glass molded product in the present embodiment, the first mold 21, the auxiliary mold 22, the piston 23 and the pair of

second molds

24, 24 are heated to a predetermined temperature and then melted in a high temperature state. Since the glass 50 is pressure-molded using the first mold 21 and the pair of

second molds

24, 24, the first mold 21, the auxiliary mold 22, the piston 23, and the pair of second molds. A series of processes to be described later can be performed while keeping the temperature of the

molds

24, 24 constant. Furthermore, a plurality of cover glasses can be sequentially manufactured while keeping the temperature of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of

second molds

24, 24 constant. Therefore, since it is not necessary to repeat heating and cooling of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of

second molds

24 and 24 every time the cover glass is manufactured, the efficiency is extremely short. A number of cover glasses can be manufactured well.

Here, keeping the temperatures of the first mold 21, the auxiliary mold 22, the piston 23, and the pair of

second molds

24, 24 constant means that the first mold 21, the auxiliary mold 22, the piston 23, and the pair. This means that the target set temperature in the temperature control for heating the

second molds

24, 24 is kept constant. Therefore, it is intended to prevent even the temperature fluctuations of the first mold 21, the auxiliary mold 22, the piston 23 and the pair of

second molds

24, 24 due to the contact of the molten glass 50 or the like during the execution of each process described later. This temperature variation is acceptable.

First, as shown in FIG. 5, the first mold and the auxiliary mold are arranged at the dropping position (step S1). FIG. 6 is a diagram illustrating a process of arranging the first mold and the auxiliary mold at the dropping position.

Specifically, as shown in FIG. 6, the first mold 21 and the auxiliary mold 22 are moved and arranged at the dropping position P <b> 1 (see FIG. 3), and the auxiliary is placed above the first mold 21. The molds 22 are arranged to face each other. The movement of the first mold 21 and the auxiliary mold 22 is performed by the control unit 40 driving the first mold driving mechanism 25 and the auxiliary mold driving mechanism 26.

More specifically, the first mold 21 is disposed such that the reservoir receiving surface 21a is positioned below the outflow pipe 13 of the material supply unit 10. Further, the auxiliary mold 22 has a piston moving passage 22e located above the reservoir receiving surface 21a of the first mold 21, and a pair of second

mold moving passages

22f and 22f respectively corresponding thereto. The first mold 21 is positioned and arranged with respect to the first mold 21 so as to be positioned above the pair of first molding surfaces 21c and 21c.

Next, as shown in FIG. 5, molten glass is dropped and received in the reservoir receiving part (step S2). FIG. 7 is a diagram showing a step of dropping molten glass, and FIG. 8 is a diagram showing a step of receiving molten glass at a reservoir receiving portion.

As shown in FIG. 3, the molten glass 50 continuously flows out vertically from the outlet of the outflow pipe 13, and the length of the molten glass 50 gradually increases in proportion to time. . When the length of the molten glass 50 reaches a predetermined length, the molten glass 50 is cut by the cutter 14.

Thereby, as shown in FIG. 7, the separated molten glass 50 is dropped vertically downward (in the direction of arrow A shown in the figure). The molten glass 50 is cut by the control unit 40 moving the cutter 14 using the cutter driving mechanism 15.

As shown in FIG. 8, the dropped molten glass 50 then passes through the piston movement passage 22 e of the auxiliary mold 22 and is received by the reservoir receiving surface 21 a of the first mold 21. Thereby, the molten glass 50 is stored and received by the storage receiver 32.

Next, as shown in FIG. 5, the first mold and the auxiliary mold are arranged at the molding position (step S3). FIG. 9 is a diagram illustrating a process of arranging the first mold and the auxiliary mold at the molding position.

Specifically, as shown in FIG. 9, by moving the first mold 21 and the auxiliary mold 22 and placing them in the molding position P2 (see FIG. 3), the piston 23 and the pair of second molds. The first mold 21 and the auxiliary mold 22 are arranged to face each other below the

molds

24 and 24. The movement of the first mold 21 and the auxiliary mold 22 is performed by the control unit 40 driving the first mold driving mechanism 25 and the auxiliary mold driving mechanism 26.

More specifically, the first mold 21 has a reservoir receiving surface 21a positioned below the piston 23, and a pair of first molding surfaces 21c and 21c positioned below the corresponding second mold 24, respectively. Thus, the piston 23 and the pair of

second molds

24, 24 are positioned and arranged. At this time, the auxiliary mold 22 is arranged so that the relative positional relationship with the first mold 21 is maintained. Thus, the piston movement passage 22e of the auxiliary mold 22 is disposed below the piston 23, and the pair of second

mold movement passages

22f and 22f of the auxiliary mold 22 correspond to the corresponding second mold. Located below the mold 24. In addition, after the molten glass 50 is collected and received by the reservoir receiver 32, the first mold 21 and the auxiliary mold 22 are moved to the molding position P2 without delay.

Next, as shown in FIG. 5, the molten glass is pressed by the piston (step S4). FIG. 10 is a diagram illustrating an intermediate stage of the process of pressing the molten glass using the piston, and FIG. 11 is a diagram illustrating an end stage of the process of pressing the molten glass using the piston.

Specifically, as shown in FIGS. 10 and 11, the piston 23 vigorously moves vertically downward (in the direction of arrow B <b> 1 shown in the drawing) so as to approach the reservoir receiving portion 32 of the first mold 21. Moved. The movement of the piston 23 is performed by the control unit 40 driving the piston drive mechanism 27.

Thereby, the molten glass 50 is pressed by the piston 23, and the pressed molten glass 50 is ejected vigorously from the pair of

extrusion channels

The above operation is performed instantaneously in a shorter time in order to prevent the molten glass 50 from being hardened in the pressing chamber 31 or / and in the pair of extrusion flow paths 33. The operation will be described in detail in stages.

First, as shown in FIG. 10, when the piston 23 moves vertically downward, the piston 23 enters the piston moving passage 22 e of the auxiliary mold 22, thereby forming the pressing chamber 31. Become.

Thereafter, when the piston 23 further moves vertically downward, the pressing surface 23a located at the lower end of the piston 23 comes into contact with the upper surface of the molten glass 50 stored in the reservoir receiving portion 32, whereby the molten glass 50 is It is pressed by the piston 23. Along with this, the pressing chamber 31 is filled with the molten glass 50, and a part of the molten glass 50 enters the pair of

extrusion channels

33 and 33.

At this time, as described above, the

inclined surfaces

21d and 21d having a shape in which the wall surface of the pressing chamber 31 adjacent to the pair of

extrusion channels

33 and 33 is inclined toward the pair of

extrusion channels

33 and 33 side. , 22d, 22d, the molten glass 50 is smoothly supplied from the pressing chamber 31 into the pair of

extrusion channels

33, 33.

Thereafter, as shown in FIG. 11, the piston 23 further moves downward in the vertical direction, so that the molten glass 50 supplied to the above-described pair of

extrusion flow paths

33, 33 is extruded along the horizontal direction. It discharges toward the outside from the

flow paths

33 and 33. Since the discharged molten glass 50 has a relatively high viscosity, the molten glass 50 does not immediately sag toward the pair of

first molding surfaces

21c, 21c of the first mold 21, and advances in the horizontal direction to each of the pair of

first molding surfaces

21c, 21c. The

escape portions

35 and 35 are reached.

Here, as described above, each of the pair of

extrusion channels

33 and 33 has a slit-like opening, and therefore, the portion of the molten glass 50 discharged from the pair of

extrusion channels

33 and 33. Is substantially plate-shaped. Therefore, by passing through the above steps, the portion of the molten glass 50 discharged from the pair of

extrusion flow paths

33, 33 is in a state close to the shape of the cover glass as a glass molded product to be molded, and a pair of molded It is supplied between the first molding surface 21 c of the first mold 21 that is a mold part and the second molding surface 24 c of the second mold 24.

Moreover, since the molten glass 50 of the part discharged from the said pair of

extrusion flow paths

33 and 33 moved to the exterior from the press chamber 31 by the flow resulting from the press by the piston 23, a temperature difference is compared. It is in a state that does not occur. Therefore, the temperature at the upper surface and the lower surface of the molten glass 50 in the discharged portion is in a state where they are kept substantially the same.

Next, as shown in FIG. 5, the second mold is brought into contact with the molten glass to perform pressure molding (step S5). FIG. 12 is a diagram illustrating a process of pressure-forming molten glass.

Specifically, as shown in FIG. 12, the pair of

second molds

24, 24 are vertically downward (in FIG. 11) so as to approach the pair of

first molding surfaces

21c, 21c of the first mold 21, respectively. In the direction of arrow C1). The movement of the pair of

second molds

24, 24 is performed by the control unit 40 driving the pair of second

mold drive mechanisms

28, 28.

Thereby, the molten glass 50 of the part discharged from a pair of

extrusion flow paths

33 and 33 each contacts the 2nd molding surface 24c of the 2nd metal mold | die 24, and also the 1st molding surface of the 1st metal mold | die 21 after that. 21c will be contacted. Thereby, the molten glass 50 will be in the state pinched | interposed between the 2nd shaping | molding surface 24c and the 1st shaping | molding surface 21c. At that time, the molten glass 50 is pressed and spread by the first molding surface 21 c and the second molding surface 24 c, thereby a pair of cavities defined by the first mold 21 and the pair of second molds 24. 34 and 34 are filled with molten glass 50, and pressure molding of molten glass 50 is performed. In addition, after the molten glass 50 is discharged from a pair of

extrusion flow paths

33 and 33, a pair of 2nd metal mold | dies 24 and 24 are dropped without delay.

The state in which the molten glass 50 is pressurized by the first mold 21 and the pair of

second molds

24 and 24 is maintained for a predetermined time. As a result, the molten glass 50 is cured in a state where the shapes of the first molding surface 21c of the first mold 21 and the second molding surface 24c of the second mold 24 are transferred to the molten glass 50. A glass molded body 60 (see FIG. 13 and the like) including the product region 61 and the non-product region 62 to be the cover glass is formed.

The temperature of the molten glass 50 at the start of the pressure treatment is preferably set to (Tg + 150) [° C.] or more and (Tg + 300) [° C.] or less with respect to the glass transition point Tg [° C.]. For example, when Tg is 540 [° C.], the temperature of the molten glass just before pressing may be 780 [° C.]. In order for the molten glass to satisfy such a temperature condition, the temperature of the first mold 21 is set to 450 [° C.] or more and 550 [° C.] or less, and the temperature of the pair of

second molds

24 and 24 is set to 450 respectively. It is good to set [C] or more and 550 [C] or less. For example, when Tg is 540 [° C.], the temperature of the first mold 21 may be set to 500 [° C.], and the temperature of the pair of

second molds

24 and 24 may be set to 520 [° C.]. .

Next, as shown in FIG. 5, the pressing and pressurization by the piston and the second mold are released (step S6). FIG. 13 is a diagram illustrating a process of releasing the pressing and pressing.

Specifically, as shown in FIG. 13, the piston 23 and the pair of

second molds

24, 24 are vertically upward (in the directions of arrows B <b> 2 and C <b> 2 shown in the figure) so as to be separated from the first mold 21. It is moved toward. Thereby, the piston 23 and the pair of second dies 24, 24 are released from the glass molded body 60. The movement of the piston 23 and the pair of

second molds

24, 24 is performed by the control unit 40 driving the piston drive mechanism 27 and the pair of second

mold drive mechanisms

28, 28.

Next, as shown in FIG. 5, the first mold and the auxiliary mold are arranged at the take-out position (step S7), and the glass molded body is taken out (step S8). FIG. 14 is a diagram illustrating a process of taking out the glass molded body by taking out the first mold and the auxiliary mold at the take-out position.

Specifically, as shown in FIG. 14, the first mold 21 and the auxiliary mold 22 are moved to be taken out and placed at the take-out position P3 (see FIG. 3), and the auxiliary mold 22 is moved vertically upward (see FIG. 14). It is separated from the first mold 21 in the direction of arrow D shown in the figure. Thereby, the auxiliary mold 22 is released from the glass molded body 60. Furthermore, the glass molded body 60 is taken out by adsorbing the glass molded body 60 by an adsorption device (not shown) and releasing the glass molded body 60 from the first mold 21. The movement of the first mold 21 and the auxiliary mold 22 is performed by the control unit 40 driving the first mold driving mechanism 25 and the auxiliary mold driving mechanism 26.

Next, as shown in FIG. 5, the non-product region of the glass molded body is cut and removed (step S9). FIG. 15A and FIG. 15B are a plan view and a cross-sectional view of a glass molded body showing a cutting position in a step of cutting and removing a non-product region of the glass molded body. FIG. 15B shows a cross-sectional view of the glass molded body taken along line XVB-XVB shown in FIG. 15A.

The front surface and the back surface of the product region 61 of the glass molded body 60 after being taken out are both formed into a mirror surface or a state close thereto by the pressure molding described above. Therefore, it is sufficient to cut and remove the non-product region 62 from the glass molded body 60 as an additional process required after pressure molding.

Specifically, as shown in FIGS. 15A and 15B, the glass molded body 60 is cut along a cutting line E shown in the drawing so that a substantially box-shaped cover glass is obtained. Thereby, the non-product area | region 62 will be removed from the glass molded object 60, and two substantially box-shaped cover glasses will be obtained.

Here, as described above, in the pressure molding step, the portion adjacent to the pair of

extrusion channels

33, 33 in the pair of

cavities

34, 34 is the side plate portion of the cover glass as a glass molded product to be manufactured. Since it is configured to correspond to a portion that forms a non-product region continuously provided from an end located on the side opposite to the side on which the main plate portion is located, it is cut during the cutting process described above. The part which becomes is an edge part located in the opposite side to the side in which the main board part of the side plate part of the manufactured cover glass is located. Therefore, not only the front and back surfaces of the main plate portion of the manufactured cover glass, but also the front and back surfaces of the side plate portions are mirror surfaces or surfaces that are close to that without being polished. It can be finished to the state.

As described above, the cover glass is manufactured using the glass molded product manufacturing method and the manufacturing apparatus 1 according to the present embodiment, so that the molten glass 50 received by the reservoir receiver 32 is slit-shaped. By extruding from the extrusion flow path 33 including the opening, the molten glass 50 can be made to have a substantially plate-like shape close to the shape of the cover glass to be manufactured. The formed molten glass 50 can be pressure-formed from both sides along the thickness direction. Therefore, the shape of the molten glass 50 can be instantly determined as the shape of the cover glass to be manufactured in a short time from the dropping of the molten glass 50 to the curing of the molten glass 50. Therefore, it is possible not only to efficiently produce a thin cover glass with excellent moldability, but also to improve transferability at the corners.

Moreover, by manufacturing the cover glass using the manufacturing method and the manufacturing apparatus 1 of the glass molded product in the present embodiment, the portion of the molten glass 50 extruded from the extrusion flow path 33 including the slit-shaped opening is formed. Since a relatively large temperature difference does not occur, in the subsequent pressure forming step, the upper surface and the lower surface, which are portions that contact the first molding surface 21c and the second molding surface 24c, of the molten glass 50 are used. It becomes possible to go through substantially the same cooling process. Therefore, also from this viewpoint, it becomes possible to efficiently produce a thin cover glass with excellent moldability.

Furthermore, by manufacturing the cover glass using the manufacturing method and the manufacturing apparatus 1 of the glass molded product in the present embodiment, compared to the case where the molten glass dropped is sandwiched in the horizontal direction and pressed. Since various production conditions can be made relatively easy to match, the quality of the produced cover glass does not vary greatly, and the cover glass can be produced with good yield.

In the embodiment of the present invention described above, from the viewpoint of further simplifying the apparatus configuration, the reservoir receiving surface, the first flow path forming surface, and the first forming surface are used as members for pressure forming molten glass. A case in which it is constituted by four members including a first mold including the auxiliary mold including the second flow path forming surface, the piston including the pressing surface, and the second mold including the second molding surface. Although illustrated, it is not always necessary to have such a configuration, and the various surfaces may be defined by more members. For example, the first mold described above may be divided into a member including a reservoir receiving surface and a first flow path forming surface, and a member including a first molding surface, and the former of these may be used as a reservoir receiver. You may divide | segment into the member containing a surface and the member containing a 1st flow-path formation surface.

Further, in the above-described embodiment of the present invention, the extruding direction when extruding the molten glass from the extruding flow path is the horizontal direction, and the sandwiching direction when the molten glass is pressure-molded using a pair of forming mold parts However, the extruding direction when extruding the molten glass from the extruding flow path is vertically downward, and the sandwiching direction when the molten glass is pressure-formed using a pair of forming mold parts is horizontal. Of course, it is possible to set the direction.

Further, in the above-described embodiment of the present invention, the wall surface of the pressing chamber in the portion adjacent to the pair of extrusion channels is configured by an inclined surface having a shape inclined toward the pair of extrusion channels. Although the case has been illustrated, instead of this, the wall surface may be configured by a curved surface having a shape that curves toward the pair of extruded flow paths.

Moreover, in the above-described embodiment of the present invention, the case where two cover glasses can be manufactured at a time by providing two extrusion flow paths so as to face the pressing chamber is exemplified. If only one extrusion channel is provided so as to face the pressing chamber, it is possible to manufacture only one cover glass at a time. On the other hand, if three or more extrusion channels are provided radially so as to face the pressing chamber, three or more cover glasses can be manufactured at a time.

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

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, 14 Cutter, 15 Cutter drive mechanism, 20 Molding part, 21 1st metal mold | die, 21a Reservoir receiving surface, 21b 1st flow path Molding surface, 21c first molding surface, 21d inclined surface, 22 auxiliary mold, 22b second flow path forming surface, 22d inclined surface, 22e piston moving passage, 22f second mold moving passage, 23 piston, 23a pressing Surface, 24 second mold, 24c second molding surface, 25 first mold drive mechanism, 26 auxiliary mold drive mechanism, 27 piston drive mechanism, 28 second mold drive mechanism, 31 pressing chamber, 32 reservoir receiving part 33 Extrusion flow path, 34 Cavity, 35 Escape part, 40 Control part, 50 Molten glass, 60 Glass molded body, 61 Product area, 62 Non-product area, 100 display device, 110 cover glass, 110a front surface, 110b back surface, 111 main plate, 112 side plate, 113 hole, 120 exterior plate, 130 circuit board, 131 speaker, 140 display, 142 images Display, P1 dripping position, P2 molding position, P3 take-out position.

Claims

A step of dripping molten glass;
A step of receiving the dropped molten glass in a reservoir receiving portion;
Extruding the molten glass from the extrusion flow path including a slit-shaped opening toward the outside of the reservoir receiver by pressing the molten glass stored in the reservoir receiver using a pressing portion;
A glass molding comprising a step of pressure-molding by sandwiching a molten glass that has been substantially plate-shaped by being extruded from the extrusion flow path from both sides using a pair of molding dies along its thickness direction. Product manufacturing method.
The extrusion direction when extruding molten glass from the extrusion flow path is a substantially horizontal direction,
The manufacturing method of the glass molded product of Claim 1 whose sandwiching direction at the time of press-molding molten glass using the pair of said shaping | molding die part is a substantially vertical direction.
A first receiving surface that includes a reservoir receiving surface that defines the reservoir receiving portion, a first flow path forming surface that defines a part of the extrusion flow channel, and a first molding surface that defines one of the pair of molding die portions. A second member that includes a member, a second channel forming surface that defines a remaining part of the extrusion channel, a third member that includes a pressing surface that defines the pressing portion, and a pair of molding die portions The manufacturing method of the glass molded product of Claim 1 or 2 which manufactures a glass molded product by using the 4th member containing the 2nd molding surface which prescribes | regulates the other.
When pressure-molding molten glass using the pair of mold parts, the molten glass is sandwiched by moving the fourth member toward the first member without moving the first member. The manufacturing method of the glass molded product of Claim 3 which press-molds by.
As the first member and the second member, those having a shape in which the wall surface of the portion adjacent to the extrusion flow channel is inclined or curved toward the extrusion flow channel side on the upstream side along the extrusion direction of the molten glass, The manufacturing method of the glass molded product of Claim 3 or 4.
The glass molded product to be pressure-molded includes a main plate portion and a side plate portion continuously provided from the periphery of the main plate portion,
When pressure-molding molten glass using the pair of forming mold portions, an end portion located on the opposite side of the side plate portion from the side where the main plate portion is located is formed adjacent to the extrusion flow path. The manufacturing method of the glass molded product in any one of Claim 1 to 5.
A plurality of extrusion channels are provided in advance as the extrusion channel, and a plurality of molten glass extruded from the plurality of extrusion channels by pressing the molten glass using the pressing unit are formed by pressing. The manufacturing method of the glass molded product in any one of Claim 1 to 6 which manufactures a glass molded product at once.
A material supply unit for dropping molten glass;
A reservoir receiver for receiving the molten glass that has been dropped;
A pressing portion that presses the molten glass stored in the reservoir receiving portion; and
An extrusion flow path including a slit-shaped opening for extruding the molten glass pressed by the pressing portion toward the outside of the reservoir receiving portion;
An apparatus for producing a glass molded article, comprising: a pair of mold parts for pressure molding by sandwiching molten glass that has been substantially plate-shaped by being extruded from the extrusion flow path from both sides along its thickness direction .