CN111847849A - Glass hot bending process and application of glass hot bending process in 3D glass preparation method - Google Patents
Glass hot bending process and application of glass hot bending process in 3D glass preparation method Download PDFInfo
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- CN111847849A CN111847849A CN202010762724.5A CN202010762724A CN111847849A CN 111847849 A CN111847849 A CN 111847849A CN 202010762724 A CN202010762724 A CN 202010762724A CN 111847849 A CN111847849 A CN 111847849A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/0066—Re-forming shaped glass by bending
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- 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
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
- C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
- C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
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- 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
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- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
The invention discloses a glass hot bending process, which comprises the steps of heating a glass blank to soften and bend the glass blank under the action of gravity, and cooling the glass blank. The invention also discloses a preparation method of the 3D glass comprising the glass hot bending process and the 3D glass prepared by the preparation method. The glass hot bending process used in the invention is different from the traditional mould pressing, the glass and the mould are gradually attached by using gravity, the surface quality of a 3D product is not damaged in the forming process, the subsequent process of removing the trace of the mould on the surface and then grinding and polishing is avoided, the 3D process flow is shortened, the production efficiency is improved, and the batch production is facilitated; the 3D glass prepared by the invention has high yield and simple preparation method, and simultaneously can be added with different pretreatments according to requirements, so that the glass has the effects of anti-dazzle, anti-reflection and the like and is applied to different occasions.
Description
Technical Field
The invention relates to the field of liquid crystal display cover plate glass, in particular to a glass hot bending process and application of the glass hot bending process in a 3D glass preparation method.
Background
3D glass has frivolous, transparent clean, anti fingerprint, anti-dazzle, excellent properties such as hard, resistant scraping, can be applied to terminal products such as high-end smart mobile phone and panel computer, wearable equipment, instrument board and industrial computer, uses 3D glass as the apron, not only can improve terminal electronic product's outward appearance fashion type, can bring very high user experience simultaneously, and the touch-control is felt better. With the rise of electronic devices, 3D glass is increasingly used in the display field, which also puts higher demands on the optical performance of the glass.
The current mainstream 3D glass production process is as follows: cutting and perforating a plain plate → finely carving and grinding → cleaning → hot bending → polishing → tempering → coating → printing → laminating → packaging. The hot bending process is a core process of 3D glass, the glass after being carved is placed in a graphite mold, then the mold is placed in a hot bending machine, the glass is formed into curved glass in the mold after preheating, profiling and cooling, and the size of the curved glass depends on the design of the graphite mold; if the glass is etched and coated firstly, the surface of the glass can be damaged by the extrusion of the die during hot pressing, but the process flow of firstly bending and then etching and coating is adopted, so that the uneven etching and coating process is easily caused due to the irregular shape of the glass after being bent, the optical performance is difficult to reach the preset target, meanwhile, the process flow of firstly bending and then etching and coating has the problems of low production efficiency, low yield and the like, the service life of the die is low, and the investment cost is high.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems of low yield and low production efficiency caused by firstly hot bending and then etching coating in the existing 3D glass preparation process, and provides a glass hot bending process and application of the glass hot bending process in a 3D glass preparation method.
Therefore, the invention adopts the following technical scheme:
the invention provides a glass hot bending process, which comprises the steps of heating a glass blank to soften and bend the glass blank under the action of gravity, and cooling the glass blank.
Further, the hot bending process comprises the steps of placing the glass blank on a bending die, heating the glass blank and the die to 650-.
Preferably, the first and second electrodes are formed of a metal,
the step-type cooling is that after the glass blank is attached to the mold due to gravity, the temperature is first cooled to 650 ℃ at the cooling speed of 10-30 ℃ and is kept for 5-300 seconds, then is cooled to 550 ℃ at 1-10 ℃/min, is cooled to 250 ℃ at the speed of 10-30 ℃/min, and is finally forcibly blown to the glass blank and the mold by cold air until the temperature is reduced to be less than or equal to 70 ℃, and the highest temperature rise point and each node of temperature reduction are different according to different used glass blanks.
The invention also discloses a preparation method of the 3D glass, which comprises the step of carrying out hot bending treatment by adopting the hot bending process according to any one of claims 1 to 3.
Further, the method comprises the steps of,
s1: cleaning the glass blank, and then cutting;
s2: carrying out the hot bending treatment on the cut glass blank to obtain rough 3D glass;
s3: cutting and edging the rough 3D glass;
s4: and strengthening the 3D glass after edging to obtain a 3D glass finished product.
Further, in S4, the strengthening is that the glass after edge grinding is put into potassium nitrate at the temperature of 380-450 ℃ for 4-10 hours; k ions in the potassium nitrate exchange with Na ions on the surface of the glass, and 500-1000Mpa pre-stress with the depth of 30-50 mu m is formed on the surface, thereby enhancing the surface performance. .
Preferably, S1 is preceded by a pretreatment of the glass blank, the pretreatment being at least one of etching and plating.
Further, the etching is to protect one side of the glass blank with an acid-resistant film, put the glass blank into an etching solution for 1-3min at 18-24 ℃, take the glass blank out, wash polishing liquid on a continuous flow line at 22-35 ℃, and finally tear off the acid-resistant film, wherein the polishing liquid is a mixture of hydrofluoric acid, sulfuric acid and water, and contains 5-15 wt% of hydrofluoric acid and 5-20 wt% of sulfuric acid.
The coating is prepared by coating the surface of a glass blank by using a sol-gel method, taking a compound containing high chemical activity components as a precursor, uniformly mixing the raw materials in a liquid phase, carrying out hydrolysis and condensation chemical reactions, and then drying, sintering and curing to prepare the material with a molecular or even nano substructure.
The invention also provides 3D glass prepared by the preparation method.
The technical scheme of the invention has the following advantages:
(1) the hot bending process used in the invention is different from the traditional mould pressing, the glass and the mould are gradually jointed by using gravity, the surface quality of the 3D glass is not damaged in the forming process, the subsequent process of re-polishing the mould trace on the surface is avoided, and meanwhile, the 3D glass process flow is shortened, the production efficiency is improved, and the batch production is facilitated because the grinding and polishing are not required after the 3D glass is formed.
(2) In the hot bending process, because the temperature rise of the surface of the glass is asynchronous with the temperature rise of the interior of the glass due to the heat conduction efficiency in the temperature rise process of the glass, the constant temperature of the top temperature is the time for keeping the temperature of the mold and the temperature of the glass uniform, and meanwhile, the time for downward bending and forming the glass in a high-temperature state is also reserved.
(3) In the hot bending process, the gradient arrangement in the cooling process can eliminate residual stress formed in the glass thermoforming process to the maximum extent, and reduce edge breakage or mouth breakage generated by breakage, cutting and grinding of a final product, and the difference between the product curvature and the design curvature caused by the balance of the residual stress; therefore, different temperature holding sections are arranged to prevent the temperature difference between the glass and the environment and between the glass and the mold due to different heat conduction speeds so as to prevent the quality defect and the curvature runaway of the surface.
(4) In the preparation method of the 3D glass, the strengthening method uses ion exchange of K ions (with larger volume) in the molten salt and Na ions (with smaller volume) on the surface of the glass to form the surface pre-stress, thereby enhancing the surface performance.
(5) According to the preparation method of the 3D glass, provided by the invention, the etching and the coating are used as pretreatment before hot bending, so that the problems that the etching and the coating are not uniform due to the irregular shape of the glass after hot bending, the optical performance is difficult to reach the preset target and the yield is low due to the fact that the glass is firstly subjected to hot bending and then etched are solved, the yield is improved, and the cost is reduced.
(5) The 3D glass prepared by the invention has high yield and simple preparation method, and simultaneously can be added with different pretreatments according to requirements, so that the glass has the effects of anti-dazzle, anti-reflection and the like and is applied to different occasions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a view showing the initial positional relationship between a glass blank and a mold in example 1 of the present invention;
FIG. 2 is a schematic structural view showing that the glass blank is gradually attached to the mold due to gravity after being softened in example 1 of the present invention;
FIG. 3 is a schematic structural view of a glass blank completely attached to a mold after being softened in example 1 of the present invention;
FIG. 4 is a schematic structural view of a crude 3D glass obtained in example 1 of the present invention;
FIG. 5 is a schematic structural view of cut rough 3D glass according to example 1 of the present invention;
FIG. 6 is an enlarged partial view of the right end of the cut raw 3D glass of FIG. 5;
fig. 7 is a schematic view of the portion of fig. 6 after being edged.
Reference numerals:
1-glass blank; 2-a mould.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field.
The reagents and instruments used in the present invention were as follows:
a hot bending machine: SWRD 900-1; laser cutting edging appearance: a large family of lasers HLSW940 GD;
etching solution: LS or ULS manufactured by Suzhou New Wu optoelectronics technology Co., Ltd; coating liquid: SD730 or ST410 of Suzhou New Wu photoelectricity technology Co., Ltd; polishing solution: a mixture of hydrofluoric acid, sulfuric acid and water, comprising 10 wt% hydrofluoric acid and 10 wt% sulfuric acid.
The rest of the reagents are all standard reagents in the market.
The following specific examples are further illustrative of the present invention, and the examples do not exemplify all the embodiments of the present invention, but only some of the embodiments are exemplified, and the specific examples are as follows:
example 1
The glass blank used in this example was Corning 2320 glass, 1.1mm thick.
The embodiment provides a preparation method of 3D glass, which comprises the following specific steps:
(1) cleaning a glass blank, and then cutting by using a laser cutting edge grinding instrument;
(2) placing the cut glass blank on a hot bending machine die (the structure is shown in figure 1), heating to 860 ℃ at a heating rate of 40 ℃/min, keeping the temperature for 100 seconds, and softening the glass blank to gradually attach to the die under the action of gravity (the structure in the softening process and the final structure are shown in figures 2 and 3);
(3) after the glass blank is attached to the mold due to gravity, firstly cooling to 640 ℃ at a cooling speed of 20 ℃, preserving heat for 50 seconds, then cooling to 550 ℃ at a speed of 10 ℃/min, then cooling to 250 ℃ at a speed of 30 ℃/min, and finally forcibly blowing the glass blank and the mold by cold air until the temperature is reduced to be less than or equal to 70 ℃ to obtain rough 3D glass (shown in figure 4);
(4) cutting (as shown in fig. 5) and edging (as shown in fig. 6 and 7) the crude 3D glass using a laser cutting edger;
(5) and putting the edge-ground 3D glass into potassium nitrate at 450 ℃ for 10 hours to obtain a 3D glass finished product.
Example 2
The glass blank used in the present example is rainbow glass CG01 brand glass, with a thickness of 1.3 mm.
The embodiment provides a preparation method of 3D glass, which comprises the following specific steps:
(1) cleaning a glass blank, putting the glass blank into an etching solution at 24 ℃ for 3min, taking out the glass blank, washing polishing solution on glass on a continuous flow line at 35 ℃, and finally tearing off an acid-resistant film;
(2) cleaning the etched glass blank, and coating a film on the surface of the glass blank by using a film coating liquid by using a sol-gel method;
(3) cleaning the coated glass blank and then cutting the glass blank by using a laser cutting edge grinding instrument;
(4) placing the cut glass blank on a hot bending machine die, heating to 800 ℃ at a heating speed of 30 ℃/min, holding the temperature for 5 seconds, and softening the glass blank to gradually attach to the die under the action of gravity;
(5) after the glass blank is attached to the mold due to gravity, firstly cooling to 620 ℃ at a cooling speed of 30 ℃ and preserving heat for 200 seconds, then cooling to 500 ℃ at a speed of 1 ℃/min, then cooling to 150 ℃ at a speed of 10 ℃/min, and finally forcibly blowing the glass blank and the mold by cold air until the temperature is reduced to be less than or equal to 70 ℃ to obtain rough 3D glass;
(6) cutting and edging the rough 3D glass by using a laser cutting edging machine;
(7) and putting the edge-ground 3D glass into potassium nitrate at 380 ℃ for 4 hours to obtain a 3D glass finished product.
Example 3
The glass blank used in this example was Japanese Asahi glass DT-X glass, 0.7mm thick.
The embodiment provides a preparation method of 3D glass, which comprises the following specific steps:
(1) cleaning a glass blank, putting the glass blank into an etching solution at 18 ℃ for 1min, taking out the glass blank, washing polishing solution on glass on a continuous flow line at 22 ℃, and finally tearing off an acid-resistant film;
(2) cleaning the etched glass blank and then cutting the glass blank by using a laser cutting edge grinding instrument;
(3) placing the cut glass blank on a hot bending machine die, heating to 700 ℃ at a heating speed of 40 ℃/min, holding the temperature for 100 seconds, and softening the glass blank to gradually attach to the die under the action of gravity;
(4) after the glass blank is attached to the mold due to gravity, firstly cooling to 520 ℃ at a cooling speed of 15 ℃, preserving heat for 300 seconds, then cooling to 450 ℃ at a speed of 5 ℃/min, then cooling to 200 ℃ at a speed of 20 ℃/min, and finally forcibly blowing the glass blank and the mold by cold air until the temperature is reduced to be less than or equal to 70 ℃ to obtain rough 3D glass;
(5) cutting and edging the rough 3D glass by using a laser cutting edging machine;
(6) and putting the edge-ground 3D glass into potassium nitrate at 420 ℃ for 8 hours to obtain a 3D glass finished product.
Example 4
The glass blank used in this example was a letter glass with a thickness of 1.6 mm.
The embodiment provides a preparation method of 3D glass, which comprises the following specific steps:
(1) cleaning a glass blank, and coating a film on the surface of the glass blank by using a film coating liquid by using a sol-gel method;
(2) cleaning the coated glass blank and then cutting the glass blank by using a laser cutting edge grinding instrument;
(3) placing the cut glass blank on a hot bending machine die, heating to 700 ℃ at a heating speed of 35 ℃/min, holding the temperature for 100 seconds, and softening the glass blank to gradually attach to the die under the action of gravity;
(4) after the glass blank is attached to the mold due to gravity, firstly cooling to 520 ℃ at a cooling speed of 25 ℃, preserving heat for 5 seconds, then cooling to 450 ℃ at a speed of 3 ℃/min, then cooling to 180 ℃ at a speed of 15 ℃/min, and finally forcibly blowing the glass blank and the mold by cold air until the temperature is reduced to be less than or equal to 70 ℃ to obtain rough 3D glass;
(5) cutting and edging the rough 3D glass by using a laser cutting edging machine;
(6) and putting the edge-ground 3D glass into potassium nitrate at 400 ℃ for 6 hours to obtain a 3D glass finished product.
Example 5
The glass blank used in this example was Thailand Asahi glass with a thickness of 1.1 mm.
The embodiment provides a preparation method of 3D glass, which comprises the following specific steps:
(1) cleaning a glass blank, and then cutting by using a laser cutting edge grinding instrument;
(2) placing the cut glass blank on a hot bending machine die, heating to 720 ℃ at a heating speed of 50 ℃/min, holding the temperature for 80 seconds, and softening the glass blank to gradually attach to the die under the action of gravity;
(3) after the glass blank is attached to the mold due to gravity, firstly cooling to 530 ℃ at a cooling speed of 15 ℃ and preserving heat for 100 seconds, then cooling to 470 ℃ at a speed of 10 ℃/min, then cooling to 200 ℃ at a speed of 20 ℃/min, and finally forcibly blowing the glass blank and the mold by cold air until the temperature is reduced to be less than or equal to 70 ℃ to obtain rough 3D glass;
(4) cutting and edging the rough 3D glass by using a laser cutting edging machine;
(5) and putting the edge-ground 3D glass into potassium nitrate at 400 ℃ for 4 hours to obtain a 3D glass finished product.
Comparative example 1
The glass blank used in this comparative example was a corning 2320 glass grade 1.1mm thick.
The comparative example differs from example 1 in that a conventional hot bending method is used, which specifically comprises:
(1) and cutting the glass blank to the size of the final product, considering the deformation of the shape after hot bending, and converting into equivalent two-dimensional cutting.
(2) Carrying out CNC edging on the cut glass until the edge requirement of a final product is met;
(3) placing the CNC product between an upper die and a lower die, heating to 860 ℃, descending the upper die, pressing downwards, and maintaining pressure;
(4) gradually cooling to less than or equal to 70 ℃; and manually taking off the upper die, and taking out the formed 3D glass product.
Compared with the 3D glass obtained in the embodiment 1, the 3D glass prepared by the comparative example is provided with the mould marks pressed up and down conventionally, needs mechanical polishing and repairing, is time-consuming, labor-consuming and easy to scrap, and can be damaged due to the fact that etching and a coating film are pressed on a mould when the preparation method is used for preparing the 3D glass if preprocessing is carried out firstly.
Comparative example 2
The glass blank used in the present example is rainbow glass CG01 brand glass, with a thickness of 1.3 mm.
The only difference between this comparative example and example 2 is that the comparative example was first hot-bent, then etched and plated.
Compared with the 3D glass obtained in the embodiment 2, the processing thickness of each position is not uniform during etching and film coating due to the radian of the glass when the curved glass is processed by firstly hot bending, and the defective rate is higher.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A glass hot bending process is characterized by comprising the steps of heating a glass blank to soften and bend the glass blank under the action of gravity, and cooling the glass blank.
2. The hot bending process according to claim 1, wherein the glass blank is placed on a bending mold, the temperature of the glass blank and the mold is raised to 650-860 ℃ at a temperature raising speed of not more than 50 ℃/min, then the temperature is maintained for 5-600 seconds, the glass is softened under the action of gravity and gradually attached to the mold, and then the glass is cooled in a step-type temperature lowering manner.
3. Hot bending process according to claim 2,
the step-type cooling is that after the glass blank is attached to the mold due to gravity, the temperature is first cooled to 650 ℃ at the cooling speed of 10-30 ℃ and is kept for 5-300 seconds, then is cooled to 550 ℃ at the speed of 1-10 ℃/min, is cooled to 250 ℃ at the speed of 10-30 ℃/min, and is finally forcibly blown to blow the glass blank and the mold by cold air until the temperature is reduced to less than or equal to 70 ℃.
4. A method of making a 3D glass comprising subjecting to a hot bending process according to any of claims 1 to 3.
5. The method of claim 4, comprising,
s1: cleaning the glass blank, and then cutting;
s2: carrying out the hot bending treatment on the cut glass blank to obtain rough 3D glass;
s3: cutting and edging the rough 3D glass;
s4: and strengthening the 3D glass after edging to obtain a 3D glass finished product.
6. The method as claimed in claim 5, wherein the strengthening step in S4 is carried out by placing the edge-ground glass in potassium nitrate at 380-450 ℃ for 4-10 hours.
7. The method according to claim 5 or 6, further comprising a pretreatment of the glass blank, the pretreatment being at least one of etching and plating, before S1.
8. The method according to claim 7, wherein the etching is performed by protecting one surface of the glass blank with an acid-resistant film, placing the glass blank into an etching solution at 18-24 ℃ for 1-3min, taking out the glass blank, washing the glass blank with a polishing solution on a continuous flow line at 22-35 ℃, and finally tearing off the acid-resistant film.
9. The method according to claim 7, wherein the coating is a coating on the surface of the glass blank by a sol-gel method.
10. A 3D glass produced by the production method according to any one of claims 4 to 9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113943114A (en) * | 2021-10-21 | 2022-01-18 | 河南平原光电有限公司 | Sintering method of composite spherical reflector |
| CN114477738A (en) * | 2021-09-28 | 2022-05-13 | 新沂市铭达玻璃有限公司 | Thermal forming process for processing automobile glass |
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