CN107117802B - Glass forming die and method for manufacturing curved glass - Google Patents
Glass forming die and method for manufacturing curved glass Download PDFInfo
- Publication number
- CN107117802B CN107117802B CN201710099131.3A CN201710099131A CN107117802B CN 107117802 B CN107117802 B CN 107117802B CN 201710099131 A CN201710099131 A CN 201710099131A CN 107117802 B CN107117802 B CN 107117802B
- Authority
- CN
- China
- Prior art keywords
- glass
- gas
- region
- glass plate
- forming mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000011521 glass Substances 0.000 title claims abstract description 235
- 238000007496 glass forming Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 239000011248 coating agent Substances 0.000 claims abstract description 68
- 238000000576 coating method Methods 0.000 claims abstract description 68
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 37
- 239000010439 graphite Substances 0.000 claims abstract description 37
- 238000000465 moulding Methods 0.000 claims description 84
- 229910021397 glassy carbon Inorganic materials 0.000 claims description 25
- 239000002296 pyrolytic carbon Substances 0.000 claims description 21
- 239000011148 porous material Substances 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000002360 preparation method Methods 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 18
- 238000005086 pumping Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 110
- 239000000463 material Substances 0.000 description 13
- 239000005354 aluminosilicate glass Substances 0.000 description 11
- 239000007833 carbon precursor Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000006059 cover glass Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 ethylene, propylene Chemical group 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 238000002303 thermal reforming Methods 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/035—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending
- C03B23/0352—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet
- C03B23/0357—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet by suction without blowing, e.g. with vacuum or by venturi effect
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
The invention provides a glass forming mold and a method for manufacturing curved glass, which can efficiently perform vacuum pumping, can obtain strong attraction force and can prevent defects on the surface of the glass. A glass forming mold is characterized in that the glass forming mold is made of graphite, the outer surface of the glass forming mold is composed of a 1 st area which is positioned on the upper surface and forms a placing part of a glass plate, and a 2 nd area except the 1 st area, and the 2 nd area is provided with a gas outlet extending from the inside of the glass forming mold and a gas-impermeable coating.
Description
Technical Field
The invention relates to a glass forming die and a method for manufacturing curved glass.
Background
Glass articles such as cover glasses for portable electronic devices are manufactured by thermal reforming. In this process, after a step of heating a glass plate to a temperature at which the glass can be deformed without damaging the glass, the heated glass is molded into a glass article having a three-dimensional (so-called "3D") shape.
In order to meet the design specifications for tight shape accuracy, a glass article for a portable device is cooled and/or annealed on a mold after molding until the glass reaches a temperature lower than the deformation temperature of the glass (a temperature at which the glass article can be safely removed from the mold). The following procedure was used in the cooling stage: for example, the mold loaded with the glass article is conveyed along more than 2 cooling stations in succession. In this step, in order to prevent deformation of the glass article and to achieve the required shape accuracy, the cooling step is performed as follows: that is, the temperature difference of the surface of the glass article is made not to exceed 5 ℃ or the like, for example, and the temperature difference of the thickness of the glass article is made not to exceed 2 ℃ or the like, for example, so that these temperature differences are made extremely small.
In order to solve such a problem, patent document 1 describes a method for producing a glass article, the method including the steps of:
(i) disposing a glass plate on a mold;
(ii) heating the glass plate to a 1 st temperature;
(iii) a step of molding the glass plate into a glass article having a three-dimensional shape by using the mold;
(iv) providing an isothermal heat transfer device including at least 1 heat pipe in thermal contact with the mold;
(v) disposing the glass article on the mold, bringing the isothermal heat transfer device into thermal contact with the mold, and cooling the glass article to a 2 nd temperature by conveying the mold, the glass article, and the isothermal heat transfer device along a thermal gradient path;
during the transporting, the isothermal heat transfer device transfers heat from a relatively high temperature region of the mold to a relatively low temperature region of the mold.
Patent document 1 describes that the mold is made of a material that can withstand exposure to high temperatures such as temperatures during molding of the glass sheet. In patent document 1, examples of the mold material include a material that does not react with (or does not adhere to) glass under molding conditions, and a material in which a molding surface is coated with a coating material that does not react with (or does not adhere to) glass under molding conditions. In one embodiment of patent document 1, the following is described: the mold is made of a non-reactive carbon material such as graphite, and the molding surface is sufficiently polished to avoid defects in the glass when the molding surface comes into contact with the glass. In another embodiment, the following is recited: the mold is made of compact ceramic materials such as silicon carbide, tungsten carbide, silicon nitride and the like, and the molding surface is coated with non-reactive carbon materials such as graphite and the like.
Patent document 1 describes the following: in the molding of a glass sheet using a mold, vacuum is used in order to attract the glass sheet to the molding surface. This is accompanied by the following steps: the mold cavity is evacuated, for example using a vacuum pump, through the holes or slits, thereby creating a vacuum within the mold cavity. By this action of creating a vacuum in the forming cavity, the glass sheet can be attracted to the forming surface. Patent document 1 describes the following: a vacuum may be created within the forming cavity before or after the glass sheet begins to bend or sag due to gravity.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2015-513308
Disclosure of Invention
Problems to be solved by the invention
However, in the invention described in patent document 1, in order to avoid the occurrence of defects in the glass when the molding surface is brought into contact with the glass, the molding surface is sufficiently polished and used; on the other hand, the vacuum is formed in the molding cavity by using a vacuum pump through a hole or a slit.
To create a vacuum, the holes must be connected to be able to draw from the mold to the hole or gap, but such holes can cause defects in the glass surface.
That is, in order to prevent defects on the glass surface, it is preferable to use a graphite material having a polished surface. On the other hand, in order to efficiently perform evacuation, it is preferable to form holes in the surface of the mold.
That is, the ability to evacuate and prevent defects on the glass surface is a problem of the dihedral back.
In view of the above problems, an object of the present invention is to provide a glass molding die and a method for manufacturing curved glass, which can efficiently perform evacuation, can obtain strong suction force, and can prevent defects on the glass surface.
Means for solving the problems
The glass molding die of the present invention for solving the above problems:
(1) the glass plate molding mold is composed of graphite, and the outer surface is composed of a 1 st area which is positioned on the upper surface and constitutes a placing part of a glass plate and a 2 nd area except the 1 st area, wherein the 2 nd area has a gas discharge port extending from the inside of the glass molding mold and has a gas-impermeable coating.
When curved glass is manufactured using the glass molding die of the present invention, first, a glass plate is placed on a placing portion. Then, after softening the glass sheet, the atmosphere gas is sucked in the 2 nd region through the gas discharge port extending from the inside of the glass molding die. Since the glass forming mold of the present invention is made of porous graphite, the glass sheet can be sucked through the continuous pores of graphite by sucking the atmospheric gas from the gas discharge port.
In particular, in the glass molding die of the present invention, since the 2 nd region has the gas impermeable coating, even if the atmospheric gas is sucked from the gas discharge port, the atmospheric gas is not sucked from the 2 nd region. Therefore, when the atmospheric gas is sucked from the gas discharge port, the atmospheric gas can be sucked concentratedly through the pores of the graphite connected to the 1 st region. Therefore, it is possible to provide a glass molding die which can efficiently perform evacuation, can obtain strong suction force, and can prevent defects on the glass surface.
The glass molding die of the present invention is preferably in the following embodiments (2) to (4).
(2) The gas impermeable coating film is made of glassy carbon or pyrolytic carbon.
Glassy carbon or pyrolytic carbon has high heat resistance, and is composed of carbon similar to that of a glass molding die, and has high releasability, and therefore, it is difficult to adhere even when it is in contact with a glass plate. Further, the gas impermeable coating is less likely to generate particles, and can be suitably used.
(3) The 1 st region has a gas-permeable coating film made of carbon.
When the air-permeable coating made of carbon is formed in the 1 st region, the smoothness of the mounting portion made of porous graphite can be improved. Further, since porous graphite is provided below the gas permeable coating and the gas permeable coating on the surface is dominant for the pressure loss of the atmospheric gas, the gas can be sucked uniformly regardless of the distance from the hole extending from the gas discharge port, and the glass plate can be efficiently molded. Further, since the gas permeable coating is formed in the 1 st region, the pores of graphite are filled, and defects on the surface of the glass plate formed on the obtained curved surface can be reduced.
(4) The air-permeable coating is made of glassy carbon or pyrolytic carbon.
When the air-permeable coating is made of glassy carbon or pyrolytic carbon, a smooth mounting portion can be obtained.
Further, in order to solve the above problems, the method for producing a curved glass of the present invention,
(5) comprises the following steps:
a glass forming mold preparation step of preparing a glass forming mold made of graphite, the glass forming mold having an outer surface constituted by a 1 st region located on an upper surface and constituting a placement portion of a glass plate, and a 2 nd region excluding the 1 st region, the 2 nd region having a gas discharge port extending from an inside of the glass forming mold and having a gas impermeable coating film;
a mounting step of mounting a glass plate on the mounting portion;
a heating step of heating the glass plate to a temperature of 1 st or higher at which the glass plate is softened;
a suction step of sucking an atmospheric gas in a space surrounded by the mounting portion and the glass plate from the gas discharge port to deform the glass plate into the shape of the mounting portion;
a cooling step of cooling the glass plate to a temperature of 2 nd or lower at which the shape of the glass plate is fixed; and
a mold releasing step of separating the glass sheet from the glass molding die.
The 1 st temperature is a temperature at which the shape of the glass can be changed, and is, for example, 10 f9.1The sum of the temperatures corresponding to the glass viscosity of dPa.s (poise) and 107The glass viscosity of dPa.s (poise) is between the temperatures corresponding to the glass viscosity. In the case of aluminosilicate glasses, the 1 st temperature is 700 ℃ to 850 ℃.
The 2 nd temperature is a temperature at which the shape of the glass cannot be changed, and is, for example, 10 th relative to the glass12Temperature corresponding to glass viscosity of dPa · s (poise). The 2 nd temperature is lower than the 1 st temperature. In the case of aluminosilicate glass, the 2 nd temperature is 500 ℃ to 650 ℃.
According to the method for manufacturing curved glass of the present invention,
curved glass is produced by using a glass forming mold which is made of graphite and has an outer surface composed of a 1 st region which is located on the upper surface and constitutes a mounting portion of a glass plate and a 2 nd region excluding the 1 st region, wherein the 2 nd region has a gas discharge port extending from the inside of the glass forming mold and has a gas impermeable coating.
Since such a glass molding die is used, when suction is performed from the gas discharge port in the suction step, the atmospheric gas can be sucked intensively from the pores of the graphite connected to the 1 st region. Therefore, it is possible to provide a method for producing a curved glass, which can efficiently perform evacuation, can obtain a strong suction force, and can prevent defects on the glass surface.
The method for producing the curved glass of the present invention is preferably the following aspects (6) to (8).
(6) The gas impermeable coating film is made of glassy carbon or pyrolytic carbon.
Glassy carbon or pyrolytic carbon is high in heat resistance, is composed of carbon similar to that of a glass molding die, has high releasability, does not adhere to a glass plate even when it comes into contact with the glass plate, and is difficult to generate particles from a gas impermeable coating film, and can be suitably used.
(7) The 1 st region has a gas-permeable coating film made of carbon.
When the air-permeable coating made of carbon is formed in the 1 st region, the smoothness of the mounting portion made of porous graphite can be improved. Further, since the porous graphite is directly under the gas permeable coating, and the gas permeable coating on the surface is dominant for the pressure loss of the atmospheric gas, the suction can be performed uniformly regardless of the distance from the hole extending from the gas discharge port, and the glass sheet can be efficiently molded. In addition, in the 1 st region, the air permeable coating is formed, whereby the pores of graphite are filled, and defects on the surface of the glass plate formed on the obtained curved surface can be reduced.
(8) The air-permeable coating is made of glassy carbon or pyrolytic carbon.
When the air-permeable coating is made of glassy carbon or pyrolytic carbon, a smooth mounting portion can be formed, and defects on the surface of the produced glass plate can be reduced.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the glass forming mold of the present invention, since the 2 nd region has the gas impermeable coating, even if the atmospheric gas is sucked from the gas discharge port, the atmospheric gas is not sucked from the 2 nd region. Therefore, when the atmospheric gas is sucked from the gas discharge port, the atmospheric gas can be sucked concentratedly through the pores of the graphite connected to the 1 st region. Therefore, the vacuum can be efficiently evacuated, and a strong suction force can be obtained, and defects on the glass surface can be prevented.
Further, according to the method for producing curved glass of the present invention, a glass forming mold is used, which is made of graphite, and has an outer surface composed of a 1 st region located on an upper surface and constituting a placing portion of a glass plate and a 2 nd region excluding the 1 st region, the 2 nd region having a gas discharge port extending from an inside of the glass forming mold and having a gas impermeable coating. Therefore, when suction is performed from the gas discharge port in the suction step, the atmospheric gas can be sucked concentratedly through the pores of the graphite connected to the 1 st region. Therefore, the vacuum can be efficiently evacuated, and a strong suction force can be obtained, and defects on the glass surface can be prevented.
Drawings
Fig. 1(a) and (b) are schematic views schematically showing an example of the glass molding die of the present invention, fig. 1(a) is a plan view of the glass molding die of the present invention, and fig. 1 (b) is a cross-sectional view taken along line a-a of fig. 1 (a).
Fig. 2 (a) to (c) are flowcharts schematically showing an example of a process of molding curved glass using the glass molding die of the present invention, in which fig. 2 (a) shows a mounting step of mounting a glass plate on the glass molding die, fig. 2 (b) shows a suction step of sucking atmospheric gas from a gas discharge port to mold the glass plate, and fig. 2 (c) shows a mold release step of releasing the molded glass plate.
Fig. 3(a) and (B) are schematic views schematically showing another example of the glass molding die of the present invention, fig. 3(a) is a plan view of the glass molding die of the present invention, and fig. 3 (B) is a cross-sectional view taken along line B-B of fig. 3 (a).
Detailed Description
The following description is made in detail.
The glass forming mold of the present invention is made of graphite, and has an outer surface composed of a 1 st region located on an upper surface and constituting a mounting portion of a glass plate, and a 2 nd region excluding the 1 st region, wherein the 2 nd region has a gas discharge port extending from an inside of the glass forming mold and has a gas impermeable coating film.
When curved glass is manufactured using the glass molding die of the present invention, first, a glass plate is placed on a placing portion. Then, after softening the glass sheet, the atmosphere gas is sucked in the 2 nd region through the gas discharge port extending from the inside of the glass molding die. Since the glass forming mold of the present invention is made of porous graphite, the glass sheet can be sucked through the continuous pores of graphite by sucking the atmospheric gas from the gas discharge port.
In particular, in the glass molding die of the present invention, since the 2 nd region has the gas impermeable coating, even if the atmospheric gas is sucked from the gas discharge port, the atmospheric gas is not sucked from the 2 nd region. Therefore, when the atmospheric gas is sucked from the gas discharge port, the atmospheric gas can be sucked concentratedly through the pores of the graphite connected to the 1 st region. Therefore, it is possible to provide a glass molding die which can efficiently perform evacuation, can obtain strong suction force, and can prevent defects on the glass surface.
The position of the gas discharge port is not particularly limited, and is preferably the bottom surface or the side surface of the glass molding die.
The gas-impermeable coating of the glass molding die of the present invention has a higher gas barrier property than the gas-permeable coating. The air permeability of the air-impermeable coating film is preferably 10-6cm2(ii) less than s, more preferably 10-7cm2The ratio of the water to the water is less than s. The air permeability of the air-permeable film is preferably 10-5cm2(ii) at least s, more preferably 10-4cm2More than s.
The air permeability can be measured by using the Carman formula of "New carbon industry (New carbon industry )" (pages 146-147) issued by Showa Kagaku K.K..
In the glass molding die of the present invention, the gas impermeable coating is preferably formed of glassy carbon or pyrolytic carbon.
Glassy carbon or pyrolytic carbon has high heat resistance, and is composed of carbon similar to that of a glass molding die, and has high releasability, and therefore, it is difficult to adhere even when it is in contact with a glass plate. Further, the gas impermeable coating is less likely to generate particles, and can be suitably used.
In the glass molding die of the present invention, the 1 st region preferably has a gas-permeable coating film made of carbon.
When the air-permeable coating made of carbon is formed in the 1 st region, the smoothness of the mounting portion made of porous graphite can be improved. Further, since porous graphite is provided below the gas permeable coating and the gas permeable coating on the surface is dominant for the pressure loss of the atmospheric gas, the gas can be sucked uniformly regardless of the distance from the hole extending from the gas discharge port, and the glass plate can be efficiently molded. In addition, in the 1 st region, the air permeable coating is formed, whereby the pores of graphite are filled, and defects on the surface of the glass plate formed on the obtained curved surface can be reduced.
The air-permeable coating is preferably made of glassy carbon or pyrolytic carbon.
When the air-permeable coating is made of glassy carbon or pyrolytic carbon, a smooth mounting portion can be obtained.
The glass to which the glass molding die of the present invention is applied may be any glass, and may be any glass such as aluminosilicate glass or soda-lime glass. The temperature conditions of the molding process can be set appropriately according to the temperature characteristics of the glass.
Next, an example of the glass molding die of the present invention will be described with reference to the drawings.
Fig. 1(a) and (b) are schematic views schematically showing an example of the glass molding die of the present invention, fig. 1(a) is a plan view of the glass molding die of the present invention, and fig. 1 (b) is a cross-sectional view taken along line a-a of fig. 1 (a).
As shown in fig. 1(a), the glass molding die 10 is made of graphite and has a glass plate mounting portion 1 with a recessed upper surface. The 1 st region 2 constitutes a placement part 1 of the glass plate, and the outer surface except for the 1 st region 2 constitutes a 2 nd region 3.
As shown in fig. 1 (b), in the glass molding die 10, a gas-permeable coating 6 made of glassy carbon is formed in the 1 st region 2, and a gas-impermeable coating 7 made of glassy carbon is formed in the 2 nd region 3. The glassy carbon of the 2 nd region 3 is formed thicker than the glassy carbon of the 1 st region 2. The glassy carbon of the 2 nd region 3 is a gas impermeable coating, and the glassy carbon of the 1 st region 2 is a gas permeable coating.
The 2 nd region 3 has a gas discharge port 4 extending from the inside of the glass molding die 10 toward the bottom surface.
Next, an example of a method for manufacturing the glass molding die 10 will be described.
First, the graphite block was subjected to outline processing to obtain a base material having an outer surface composed of region 1, region 2 located on the upper surface and serving as a placement portion 1 of a glass plate, and region 2, region 3 excluding region 1.
At this time, the outline processing is performed so that the 1 st region 2 located on the upper surface is recessed.
Next, the entire outer surface of the obtained substrate is coated with a carbon precursor solution, and then heated to be cured. Next, the carbon precursor is carbonized by heating in a firing furnace, and a gas-permeable coating 6 made of glassy carbon is formed on the entire outer surface.
Next, the 1 st region 2 is masked, and a carbon precursor solution is applied only to the 2 nd region 3, followed by heating and curing. Next, the carbon precursor is carbonized in a firing furnace.
It is preferable to use a carbon precursor having a solute concentration higher than that of a previously used solution, for example, as the carbon precursor to be applied only to the 2 nd region 3. The carbon precursor applied only to the 2 nd region 3 has a higher carbonization yield than the previously applied carbon precursor, and thus a gas impermeable coating film can be efficiently obtained.
Further, since the air-permeable coating 6 is once formed in the 2 nd region 3 and the carbon precursor is further applied, pores remaining on the surface of the air-permeable coating 6 can be filled.
In this way, the gas-permeable film 6 made of glassy carbon can be formed in the 1 st region 2, and the gas-impermeable film 7 made of glassy carbon can be formed in the 2 nd region 3.
Then, 2 or more non-through holes are opened from the bottom surface of the base material. The tip of the non-through hole is a gas discharge port 4 extending to the position just below the mounting portion 1.
Through the above steps, the glass molding die 10 can be manufactured.
Next, an example of a method for producing curved glass using the glass molding die thus obtained will be described. The method for producing curved glass using such a glass molding die may be the method for producing curved glass of the present invention.
In the following description, a method for producing a curved glass using a glass plate made of aluminosilicate glass will be described. The method for producing the curved glass of the present invention is not limited to the following method.
The method for manufacturing the curved glass comprises the following steps: a glass forming mold preparation step of preparing a glass forming mold made of graphite, the glass forming mold having an outer surface constituted by a 1 st region located on an upper surface and constituting a placement portion of a glass plate, and a 2 nd region excluding the 1 st region, the 2 nd region having a gas discharge port extending from an inside of the glass forming mold and having a gas impermeable coating film; a mounting step of mounting a glass plate on the mounting portion; a heating step of heating the glass plate to a temperature of 1 st or higher at which the glass plate is softened; a suction step of sucking an atmospheric gas in a space surrounded by the mounting portion and the glass plate from the gas discharge port to deform the glass plate into the shape of the mounting portion; a cooling step of cooling the glass plate to a temperature of 2 nd or lower at which the shape of the glass plate is fixed; and a mold releasing step of separating the glass sheet from the glass molding die.
Fig. 2 (a) to (c) are flowcharts schematically showing an example of a process of molding curved glass using the glass molding die of the present invention, in which fig. 2 (a) shows a mounting step of mounting a glass plate on the glass molding die, fig. 2 (b) shows a suction step of sucking atmospheric gas from a gas discharge port to mold the glass plate, and fig. 2 (c) shows a mold release step of releasing the molded glass plate. Since the heating step and the cooling step do not change in appearance, steps (a) to (c) of fig. 2 are omitted.
(glass Molding die preparation Process)
First, the glass molding die of the present invention is prepared. The method for manufacturing the glass molding die of the present invention is not described herein since it is described above.
(mounting step)
In this step, the glass plate is placed on the placing section.
That is, as shown in fig. 2 (a), the glass plate 5 of aluminosilicate glass is placed on the placement portion of the glass molding die 10.
(heating step)
Subsequently, the glass plate is heated to a temperature of 1 st or higher at which the glass plate is softened.
That is, the glass plate 5 is heated together with the glass molding die 10 to the 1 st temperature at which the glass plate 5 is softened. In this example, since a glass plate of aluminosilicate glass is used, the 1 st temperature is 700 ℃ to 850 ℃. The 1 st temperature varies depending on the composition of the aluminosilicate glass, and for example, when the 1 st temperature is 800 ℃, it is preferable to heat the aluminosilicate glass to 830 ℃ in this step.
(suction step)
Then, the atmospheric gas in the space surrounded by the mounting portion and the glass plate is sucked from the gas discharge port, and the glass plate is deformed into the shape of the mounting portion.
That is, as shown in fig. 2 (b), the atmosphere gas is sucked from the gas discharge port 4. The atmospheric gas is sucked and passes through the gas discharge port 4, and the atmospheric gas in the space sandwiched between the glass plate 5 and the mounting portion 1 is discharged through the gas-permeable coating, and the glass plate 5 is deformed into the shape of the mounting portion 1 to become the curved glass.
In this case, since the atmospheric gas is sucked through the pores of the graphite, the atmospheric gas is uniformly sucked over the entire surface, and defects generated on the surface of the glass plate can be prevented.
The process is preferably carried out under an inert atmosphere. The inert atmosphere is not particularly limited, and examples thereof include nitrogen and argon. These gases are not adversely affected by corrosion or the like of the glass molding die 10 and the glass plate 5, and can be suitably used.
(Cooling Process)
Subsequently, the glass plate is cooled to a temperature of 2 nd or lower at which the shape of the glass plate is fixed.
That is, the glass-forming mold 10 is cooled to the 2 nd temperature or lower at which the shape of the glass plate 5 is fixed. In this example, since a glass plate of aluminosilicate glass is used, the 2 nd temperature is 500 to 650 ℃. The 2 nd temperature varies depending on the composition of the aluminosilicate glass, and when the 2 nd temperature is 600 ℃, for example, it is preferable to cool the aluminosilicate glass to 550 ℃.
The cooling method may be performed by bringing the glass molding die 10 into contact with a heat radiating member, or may be performed by circulating a heat medium inside the glass molding die 10.
(mold releasing step)
Next, the glass sheet is separated from the glass forming mold.
That is, as shown in fig. 2 (c), the glass plate 5 which is curved glass is released from the cooled glass molding die 10. The method of releasing the mold is not particularly limited, and the following methods can be used: a method of rotating the glass molding die 10 in the reverse direction and dropping it by gravity; and a method of introducing an atmospheric gas from the gas outlet 4 and floating the atmospheric gas by gas pressure.
As described above, curved glass can be obtained using the glass molding die of the present invention.
Next, another example of the glass molding die of the present invention will be described.
FIGS. 3(a) and (B) are schematic views showing another example of the glass molding die of the present invention, FIG. 3(a) is a plan view of the glass molding die of the present invention, and FIG. 3 (B) is a sectional view taken along line B-B of FIG. 3 (a).
The glass molding die 110 shown in fig. 3(a) is made of graphite and has a glass plate mounting portion 101 with a recessed upper surface. The 1 st region 102 constitutes a glass plate mounting portion 101, and the outer surface except for the 1 st region 102 constitutes a 2 nd region 103.
As shown in fig. 3 (b), in the glass molding die 110, a gas impermeable coating 107 made of pyrolytic carbon is formed in the 2 nd region 103. The 2 nd region 103 has a gas discharge port 104 extending from the inside of the glass molding die 110 to the bottom surface.
In the 1 st region 102, neither a gas-permeable film nor a gas-impermeable film is formed.
Next, an example of a method for manufacturing the glass molding die 110 will be described.
First, the graphite block is subjected to outline processing to obtain a base material including side surfaces and a bottom surface which are the 2 nd regions 103. At this stage, the upper surface is not recessed, and only the side surface and the bottom surface of the base material are formed into the desired shape.
Then, a film of pyrolytic carbon is formed entirely on the surface of the base material.
The pyrolytic carbon coating can be formed on the surface by heating the substrate in a CVD furnace and introducing a hydrocarbon gas. The hydrocarbon gas is not particularly limited, and methane, ethane, propane, butane, ethylene, propylene, or the like can be used.
The film thus formed becomes a gas impermeable film 107.
In this way, the base material on which the coating of pyrolytic carbon is formed as a whole is formed in the shape of the glass molding die 110. That is, the upper surface side of the base material was machined to remove the pyrolytic carbon coating so as to form the placement portion 101 of the glass plate, and the surface was polished to obtain the 1 st region 102 while forming a recess. In the obtained 1 st region 102, neither a gas-permeable coating nor a gas-impermeable coating was formed.
Then, 2 or more non-through holes are opened from the bottom surface of the base material. The tip of the non-through hole is a gas discharge port 104 extending to the position just below the mounting portion 101.
In the glass molding die 110 thus obtained, similarly to the glass molding die 10 shown in fig. 1(a) and (b), the outer surface is constituted by the 1 st region 102 located on the upper surface and constituting the placement portion 101 of the glass plate and the 2 nd region 103 excluding the 1 st region 102, and the 2 nd region 103 has the gas discharge port 104 extending from the inside of the glass molding die 110 and has the gas impermeable coating 107.
In the glass molding die 110 thus obtained, since the 2 nd region 103 has the gas impermeable coating 107, even if the atmospheric gas is sucked from the gas discharge port 104, the atmospheric gas is not sucked from the 2 nd region 107. Therefore, when the atmospheric gas is sucked from the gas discharge port 104, the atmospheric gas can be sucked from the pores of the graphite connected to the 1 st region 102 in a concentrated manner. Therefore, the vacuum can be efficiently evacuated, and a strong suction force can be obtained, and defects on the glass surface can be prevented.
Industrial applicability
The glass forming mold of the present invention is applicable to bending of thin glass, and can be used as a glass forming mold for a cover glass covering a display screen of a mobile phone, a smartphone, or the like, for example.
Description of the symbols
1. 101 placing part
2. 102 1 st region
3. 103 2 nd area
4. 104 gas discharge port
5 glass plate
6 air-permeable coating film
7. 107 gas-impermeable coating
10. 110 glass forming die
Claims (8)
1. A glass forming mold comprising porous graphite,
the outer surface of the glass forming mold is composed of a 1 st area which is positioned on the upper surface and constitutes a placing part of the glass plate and a 2 nd area except the 1 st area,
the 2 nd region has a gas discharge port extending from the inside of the glass molding die and not a through hole, and has a gas impermeable coating film,
the 1 st region can suck atmospheric gas only through pores of the porous graphite,
the tip of the non-through hole extends to a position right below the placement portion.
2. The glass-forming mold of claim 1, wherein the gas-impermeable coating is comprised of glassy carbon or pyrolytic carbon.
3. The glass-forming mold of claim 1 or claim 2, wherein the 1 st zone has a gas-permeable coating composed of carbon.
4. The glass-forming mold of claim 3, wherein the gas-permeable coating is comprised of glassy carbon or pyrolytic carbon.
5. A method for manufacturing curved glass, characterized by comprising the steps of:
a glass forming mold preparation step of preparing a glass forming mold made of porous graphite, wherein an outer surface of the glass forming mold is composed of a 1 st region located on an upper surface and constituting a placement portion of a glass plate, and a 2 nd region excluding the 1 st region; the 2 nd region has a gas discharge port of a non-through hole extending from the inside of the glass molding die and has a gas impermeable coating film; the 1 st region can suck atmospheric gas only through pores of the porous graphite; the front end of the non-through hole extends to the position right below the carrying part;
a mounting step of mounting a glass plate on the mounting portion;
a heating step of heating the glass plate to a temperature not lower than 1 st temperature at which the glass plate is softened;
a suction step of sucking an atmospheric gas in a space surrounded by the mounting portion and the glass plate from the gas discharge port to deform the glass plate into the shape of the mounting portion;
a cooling step of cooling the glass plate to a temperature of 2 nd or lower at which the shape of the glass plate is fixed; and
a mold releasing step of separating the glass sheet from the glass forming mold.
6. The method for producing curved glass according to claim 5, wherein the gas impermeable coating is formed of glassy carbon or pyrolytic carbon.
7. The method for manufacturing curved glass according to claim 5 or 6, wherein the 1 st region has a gas-permeable coating film made of carbon.
8. The method for manufacturing curved glass according to claim 7, wherein the gas-permeable coating is made of glassy carbon or pyrolytic carbon.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016034541A JP6670632B2 (en) | 2016-02-25 | 2016-02-25 | Glass mold and method for producing curved glass |
| JP2016-034541 | 2016-02-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107117802A CN107117802A (en) | 2017-09-01 |
| CN107117802B true CN107117802B (en) | 2020-05-22 |
Family
ID=59717224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710099131.3A Active CN107117802B (en) | 2016-02-25 | 2017-02-23 | Glass forming die and method for manufacturing curved glass |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6670632B2 (en) |
| CN (1) | CN107117802B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019151554A1 (en) * | 2018-02-05 | 2019-08-08 | 주식회사 이톰 | Vitreous carbon mold for glass molding, master core mold for manufacturing vitreous carbon mold for glass molding, and method for manufacturing vitreous carbon mold for glass molding |
| KR102051147B1 (en) * | 2018-02-05 | 2019-12-03 | 주식회사 이톰 | Glassy carbon mold for glass molding, master core mold for fabricating glassy carbon mold for glass molding and method of fabricating glassy carbon mold for glass molding |
| CN110963677A (en) * | 2018-09-30 | 2020-04-07 | 深圳精匠云创科技有限公司 | Forming method and forming device for multi-curved-surface glass |
| CN109081563B (en) * | 2018-09-30 | 2020-10-27 | 东旭光电科技股份有限公司 | 3D glass hot bending machine and 3D glass forming method |
| CN113767074B (en) * | 2018-12-07 | 2023-11-17 | 尼普洛株式会社 | Equipment for processing glass components |
| CN111348821A (en) * | 2018-12-21 | 2020-06-30 | 财团法人工业技术研究院 | Graphite mold for glass shaping and manufacturing method thereof |
| CN112079555B (en) * | 2019-06-13 | 2022-09-30 | 北京小米移动软件有限公司 | 3D glass forming die and 3D glass forming system |
| CN112142304A (en) * | 2019-06-27 | 2020-12-29 | Oppo（重庆）智能科技有限公司 | Die-casting die, shell die-casting system, manufacturing method, shell and electronic equipment |
| CN110395887A (en) * | 2019-08-05 | 2019-11-01 | 重庆两江联创电子有限公司 | Bend glass forming method |
| CN112441725A (en) * | 2019-09-03 | 2021-03-05 | Oppo广东移动通信有限公司 | Electronic device, battery cover, and method of manufacturing the same |
| CN113387552A (en) * | 2021-06-29 | 2021-09-14 | Oppo广东移动通信有限公司 | Manufacturing method of cover plate with different thicknesses, cover plate with different thicknesses and electronic device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101484286A (en) * | 2006-07-03 | 2009-07-15 | 住友电气工业株式会社 | Manufacturing method of ceramics molded part, mold used therein and ceramic molded part |
| CN104428262A (en) * | 2011-11-23 | 2015-03-18 | 康宁股份有限公司 | Method and system for making glass articles |
| CN105683103A (en) * | 2013-11-04 | 2016-06-15 | 康宁精密素材株式会社 | Glass substrate forming apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2132717T3 (en) * | 1994-11-02 | 1999-08-16 | Portec Ag | DEVICE FOR THE CIRCULATION OF A FLUID BETWEEN A VOLUME BOUND BY A SOLID SURFACE AND A CHANNEL, AND THE MANUFACTURING PROCEDURE FOR THIS DEVICE. |
| CN103030262A (en) * | 2011-09-30 | 2013-04-10 | 富泰华工业（深圳）有限公司 | Shaping method of curved-surface glass plate and shaping equipment adopted in shaping method |
-
2016
- 2016-02-25 JP JP2016034541A patent/JP6670632B2/en active Active
-
2017
- 2017-02-23 CN CN201710099131.3A patent/CN107117802B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101484286A (en) * | 2006-07-03 | 2009-07-15 | 住友电气工业株式会社 | Manufacturing method of ceramics molded part, mold used therein and ceramic molded part |
| CN104428262A (en) * | 2011-11-23 | 2015-03-18 | 康宁股份有限公司 | Method and system for making glass articles |
| CN105683103A (en) * | 2013-11-04 | 2016-06-15 | 康宁精密素材株式会社 | Glass substrate forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107117802A (en) | 2017-09-01 |
| JP2017149615A (en) | 2017-08-31 |
| JP6670632B2 (en) | 2020-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107117802B (en) | Glass forming die and method for manufacturing curved glass | |
| US11400691B2 (en) | Methods of forming shaped glass articles from glass sheets | |
| TWI535673B (en) | Curved glass forming method and mold used therefor | |
| JP6212495B2 (en) | Method and system for making glass articles | |
| TWI543945B (en) | Method of forming a 3d glass article from a 2d glass sheet | |
| JP6221745B2 (en) | Glass casing molding apparatus, molding method and manufacturing method, and glass material manufacturing method | |
| TW201404729A (en) | Mould and apparatus of glass molding and method using same | |
| JP2019525886A (en) | Suction support for glass | |
| US8691706B2 (en) | Reducing substrate warpage in semiconductor processing | |
| KR100839731B1 (en) | Mold press molding mold and optical device manufacturing method | |
| JP2004200436A (en) | Susceptor and manufacturing method thereof | |
| JP6677530B2 (en) | Glass mold and method for producing curved glass | |
| CN110963677A (en) | Forming method and forming device for multi-curved-surface glass | |
| TWM652536U (en) | Bearing plate for negative pressure suction, bearing device for negative pressure suction and peeling platform | |
| JP3234871B2 (en) | Method for manufacturing glass optical element | |
| TW201831412A (en) | Airtight chamber for air-tight continuous thermoforming device by which oxygen released from a thermal insulation layer during heating can be effectively prevented | |
| TWI641564B (en) | Transfer board | |
| CN107004611A (en) | Sintering tool for the lower mold of the sintering device | |
| KR102668806B1 (en) | Ceramic heater and method of fabricating the same | |
| TW201341321A (en) | Mold release sheet and method for molding glass molded article | |
| TWI667207B (en) | Heating and heating field device for molding stereoscopic glass continuous forming device | |
| CN118405940A (en) | Preparation method of TaC/C composite crucible for growth of large-size AlN crystal | |
| RU2560456C2 (en) | Annealing of ceramic parts | |
| KR101231330B1 (en) | Method for manufacturing sintered body | |
| TWM539506U (en) | Gastight thermal insulation layer of continuous molding apparatus for molding three-dimensional glass |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |