CN111995261A - Method for manufacturing ultrathin glass substrate - Google Patents
Method for manufacturing ultrathin glass substrate Download PDFInfo
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- CN111995261A CN111995261A CN202010808885.3A CN202010808885A CN111995261A CN 111995261 A CN111995261 A CN 111995261A CN 202010808885 A CN202010808885 A CN 202010808885A CN 111995261 A CN111995261 A CN 111995261A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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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
-
- 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
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
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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
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/097—Glass compositions containing silica with 40% to 90% silica, by weight containing phosphorus, niobium or tantalum
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- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Glass Compositions (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
The invention discloses a manufacturing method of an ultrathin glass substrate, wherein the thickness of the ultrathin glass substrate is 0.2-0.4 mm, and the specific manufacturing method comprises the following steps: 1) cutting the glass sheet, wherein the size of the cut glass is larger than that of the product; 2) molding the glass cut in the step 1) by adopting a CNC (computerized numerical control) process, and then carrying out flat grinding treatment, wherein the treatment time is 240-40 rpm, the grinding disc rotating speed is 20-40rpm, and the flat grinding polishing powder concentration is matched according to 1.0-1.2 g/ml; 3) the glass is subjected to strengthening and fine polishing treatment, ultrasonic cleaning is carried out before strengthening and after strengthening fine polishing, and the fine polishing process comprises the following steps: the time is 60S-120S, the rotating speed of a grinding disc is 20-40rpm, and the concentration of the flat grinding polishing powder is proportioned according to 0.8-1.0 g/ml; and sequentially carrying out silk-screen printing treatment, ultrasonic cleaning, inspection and gum pasting to obtain the ultrathin glass substrate product. When strengthening, a proper chemical strengthening mode is selected according to the product, and primary strengthening or secondary strengthening is adopted. The product with high yield and excellent and stable performance can be obtained by adopting the manufacturing method.
Description
Technical Field
The invention relates to the technical field of glass, is suitable for display screens such as mobile phones, flat plates and the like, and particularly relates to a manufacturing method of an ultrathin glass substrate.
Background
At present, display equipment such as smart phones, flat panels and notebooks are deeply inserted into the living aspects of people, and most of the front and back surfaces of the display equipment adopt glass cover plates. In daily use, generally for handheld use, fall easily, if display device falls ground or the higher concave-convex surface of hardness or rough ground, easily cause the display device screen breakage, and need change the screen after the breakage, the cost is higher.
Disclosure of Invention
According to the manufacturing method of the ultrathin glass substrate, provided by the invention, the product produced according to the process can effectively prevent the screen from being broken in the falling process.
The technical scheme of the invention is that the manufacturing method of the ultrathin glass substrate is characterized in that the thickness of the ultrathin glass substrate is 0.2-0.4 mm, and the specific manufacturing method comprises the following steps:
1) cutting the glass sheet, wherein the size of the cut glass is larger than that of the product;
2) molding the glass cut in the step 1) by adopting a CNC (computerized numerical control) process, and then carrying out flat grinding treatment, wherein the treatment time is 240-40 rpm, the grinding disc rotating speed is 20-40rpm, and the flat grinding polishing powder concentration is matched according to 1.0-1.2 g/ml;
3) the glass is subjected to strengthening and fine polishing treatment, ultrasonic cleaning is carried out before strengthening and after strengthening fine polishing, and the fine polishing process comprises the following steps: the time is 60-120s, the rotating speed of a grinding disc is 20-40rpm, and the concentration of the flat grinding polishing powder is proportioned according to 0.8-1.0 g/ml; and sequentially carrying out silk-screen printing treatment, ultrasonic cleaning, inspection and gum pasting to obtain the ultrathin glass substrate product.
Further, during cutting in the step 1), the sizes of the cut glass in the length direction and the width direction are 0.8-1.0mm larger than the size of the product, wherein the single side is 0.40-0.50mm larger.
Further, when the CNC process is adopted for forming in the step 1), four corners are removed, the shape is rough, the shape is refined, and the 2.5D cambered surface is selectively refined according to product requirements.
Further, after the molding in the step 2), performing 3D hot bending treatment according to product requirements, performing ultrasonic cleaning before the 3D hot bending treatment, performing light scanning after the 3D hot bending treatment, and performing the operation in the step 3); or directly performing circular arc polishing on the 2.5D product formed in the step 2), performing the operation of the step 3) after performing upper scanning and lower grinding, wherein the upper scanning and lower grinding process is performed by adopting the same process parameters as the flat grinding in the step 2).
Further, the glass original sheet is high-alumina glass, primary chemical strengthening is adopted during strengthening treatment in the step 3), and potassium nitrate with the purity of more than 99.9% is adopted as a strengthening salt solution; preheating is carried out before product strengthening, wherein the preheating temperature is 300-340 ℃, and the preheating time is 0.5-1 h; transferring the preheated product into a strengthening salt solution, controlling the strengthening temperature to be 390-430 ℃, and strengthening the product for 60-120 minutes; and (4) placing the strengthened product into room temperature for heat dissipation, and carrying out the next procedure operation when the temperature of the product is reduced to below 50 ℃.
Further, the high alumina glass contains SiO by mass255-60% of Al2O313% -18% of Na2O is 10% -15%, P5O22 to 4 percent.
Further, the glass original sheet is lithium silicon aluminum glass, secondary strengthening is adopted during strengthening treatment in the step 3), wherein sodium nitrate content in primary strengthening salt solution is 80-100wt%, the balance is potassium nitrate, the strengthening temperature is 395-430 ℃, and the strengthening time is 30-60 minutes; during secondary strengthening, the content of sodium nitrate is 0-4wt%, the rest is potassium nitrate, the strengthening temperature is 380-395 ℃, and the strengthening time is 30-60 minutes; preheating the product before each strengthening, wherein the preheating temperature is 300-340 ℃, and the preheating time is 0.5-1 h; after the strengthening, the heat dissipation is carried out until the temperature of the product is reduced to below 50 ℃, and then the next working procedure operation is carried out.
Further, the lithium aluminosilicate glass is SiO by mass2Over 60% of Al2O3Above 18% of Li2O is more than 5 percent and Na2O is more than 10 percent.
Further, after the strengthening treatment in the step 3), performing performance tests, specifically comprising a warping test, a hollow ball drop test, a solid ball drop test and a blank pressing test.
Further, the ultra-thin glass substrate product is a 2D, 2.5D or 3D product.
The invention has the following beneficial effects:
1. and (3) performing plane grinding treatment on the obtained 2D product after CNC treatment on the ultra-thin glass. For the 2D protection plate, the process can effectively improve the quality of the unevenness of the surface of the product, improve the surface evenness of the product and improve the user experience. For the 3D protection sheet, the hot bending is added on the basis of 2D, the surface flatness of the product after flat grinding is further improved without considering the influence of the factors of the hot bending die, and the yield, the service life of the die and the yield of the hot bending process are all benefited.
2. Since the high alumina glass does not contain lithium ions, the lithium aluminosilicate glass contains lithium ions. When the high-alumina glass is chemically strengthened, the ion exchange is mainly carried out between Na ions in the glass and K ions in the strengthening salt solution, and the diameter of the K ions is larger than the radius of the Na ions, so that the compressive stress is formed on the surface of the glass after the ion exchange, and the strength of a product is improved; as the lithium aluminosilicate glass has more Li ions in the internal content than the high alumina glass, the secondary strengthening process is adopted, the Li ions in the glass are mainly subjected to ion exchange with Na ions in a salt solution in the first step of strengthening, and the Na ions in the glass are mainly subjected to ion exchange with K ions in the salt solution in the second step of strengthening.
3. Because the product body is thinner, in the strengthening verification process, long strengthening time is adopted, the product is easy to warp greatly and S-shaped twist, and thus, the strengthening is carried out in a short time. During the CNC forming process, the CNC forming machine is easy to crush, the vacuum suction force is too large, the supporting points at the bottom of a product are few, and the grooving of a CNC tool is larger than 4 mm. Through reducing vacuum suction, reduce to 0.3Mpa from original 0.6Mpa, the product bottom increases one times the strong point, and CNC frock fluting width is at 1-2mm, and the fluting angle has original 90 to change 22.5.
4. Preheating before product strengthening reduces the temperature difference between the product and the strengthening salt solution, and avoids the possibility of product breakage after the product is subjected to cold and hot shock. The product is subjected to a heat dissipation process, the temperature of the surface of the product after the product is strengthened reaches 390 ℃ when the product is discharged from the strengthening furnace, the product is directly placed at room temperature, and irreversible defects such as distortion and the like can occur on the surface of the product due to the large temperature difference between the product and the strengthening furnace, so that annealing needs to be performed in a stable mode.
5. For the 2D product, a flat grinding process is added before strengthening, and a fine polishing process is added after strengthening, the process can improve the flatness of the surface of the product, so that the surface of the product is more flat, and the performance strength of the 2D product is improved by about 30%. For 2.5D products, the products subjected to CNC have poor edge quality, therefore, the 2.5 surfaces are required to be polished and smooth, and after the products are strengthened, the products are polished again, so that the performance of the products can be improved by about 30%. For 3D products, the flat grinding process is carried out before 3D hot bending, the 3D hot bending yield can be improved by about 40%, and the service life of a hot bending die is prolonged by about 20% or more.
Detailed Description
The present invention will be further illustrated with reference to the following examples, but the present invention should not be construed as being limited thereto.
Example 1:
the process flow of the ultrathin high-alumina glass substrate (2D) is as follows:
high aluminum sheet → cutting → CNC forming → flat grinding → ultrasonic cleaning → one-time chemical strengthening → fine polishing → ultrasonic cleaning → silk screen printing → ultrasonic cleaning → inspection → adhesive gum → finished product.
Among the high alumina glasses, SiO2At 58%, Al2O3At 18%, Na2O is 12 percent.
The thickness of the high-alumina glass original sheet is 0.33mm, and the size specification of a target product is as follows: 156.23 78.52 mm, the product was processed as follows:
cutting: when in specific cutting, a cutting knife wheel is adopted for cutting, the size of the cutting knife wheel is 0.80-1.0mm larger than that of a finished product, and the size of the single side is 0.40-0.50mm larger. The cut product size was: 157.03*79.32*0.33.
CNC molding: processing a product obtained by cutting the raw material according to the drawing requirements, wherein the processing comprises removing four corners, roughing the appearance and finishing the appearance; four corners are removed by adopting 1500-charge 2000mm/min, and the sand particle size of the grinding head is selected: 400# -600 #; the shape roughing adopts feeding 2500-: 400# -600 #; the shape finishing adopts the feeding of 2500 + 3500mm/min, the sand particle size of the grinding head is selected: 800# -1200 #.
Flat grinding: and (3) carrying out flat grinding treatment by using a flat grinding machine, wherein the time is 250S, the rotating speed of a grinding disc is 40rpm, and the concentration of polishing powder is 1.2 g/ml.
Ultrasonic cleaning: cleaning by adopting a 13-groove ultrasonic cleaning machine, wherein the ultrasonic frequency is 60 KHZ; 5% of liquid detergent is added into the first tank and the second tank of the ultrasonic cleaning machine, the cleaning time of each tank is 3min, and the temperature of each tank is controlled to be 50 ℃.
Primary chemical strengthening: preheating the product for 0.5 h; the temperature is 310 ℃; the strengthening salt solution used in strengthening is potassium nitrate with the mass concentration of more than 99.9 percent, the strengthening temperature is 390-430 ℃, and the strengthening time is 60 min; after the strengthening is finished, heat dissipation is carried out at room temperature to below 50 ℃.
Fine polishing: and (3) carrying out fine polishing treatment by adopting a flat grinding machine, wherein the time is 60S, the rotating speed of a grinding disc is 30rpm, and the concentration of polishing powder is 0.9 g/ml.
Ultrasonic cleaning: and carrying out ultrasonic cleaning again after the strengthening is finished. Specifically, a 13-groove ultrasonic cleaning machine is adopted for cleaning, and the ultrasonic frequency is 40 KHZ; 5% of toilet cleaning agent is added into a first tank and a second tank of the ultrasonic cleaner, the cleaning time of each tank is 3min, and the temperature of each tank is controlled to be 50 ℃.
And (3) silk-screen printing: and screen printing is carried out by adopting a gauze with 360-420 meshes, and the ink is uniformly coated on the back surface of the product.
Ultrasonic cleaning: and (5) carrying out ultrasonic cleaning on the product after the silk screen printing is finished. Particularly, a 13-groove ultrasonic cleaning machine is adopted for cleaning, and the ultrasonic frequency is 40 KHZ; 2-3% of sodium hydroxide is added into a first tank and a second tank of the ultrasonic cleaner, the cleaning time of each tank is 3min, and the temperature of each tank is controlled to be 50 ℃.
And (4) checking: the inspection items mainly comprise edge breakage inspection, scratch inspection and point object inspection.
The standard of edge breakage test is as follows: d represents the bad diameter size.
d is less than or equal to 0.03mm
D is more than 0.03mm and less than or equal to 0.30mm and less than 3 pieces/m 2
d > 0.30mm is not allowed
The scratch inspection standard is as follows: w is the width of the scratch
w is less than or equal to 0.05 mm;
w is more than 0.05mm and less than 0.1mm, L is less than or equal to 10mm and less than 5 strips;
w is not allowed to be larger than or equal to 0.10 mm.
The point object detection standard is the same as the edge breakage detection.
Gluing a back adhesive: and applying a gluing process to glue the back glue to the back position of the product to obtain a finished product.
The strengthened performance test comprises the following test items: warpage test, ball drop test (hollow), ball drop test (solid), edge press test.
And (3) warpage testing: the test method comprises the following steps: and testing the distance from the waist or four corners of the product to the marble platform on the marble platform.
Ball drop test (open): the ball drop test is carried out according to specific terminal requirements, and generally adopts a parameter of 64g/80cm for testing. The test method comprises the following steps: and (3) placing the product on a flat plane, adopting a 64g steel ball, dropping the steel ball from a position with the height of 80cm, taking the dropping point of the steel ball as the central position of the product, if the steel ball is not broken by 80cm in the test process, increasing the height, testing again from a position of 90cm, and so on until the product is broken.
Ball drop test (solid): the ball drop test is carried out according to specific terminal requirements, and generally adopts a parameter of 64g/120cm for testing. The test method comprises the following steps: and (3) placing the product on a flat plane, adopting a 64g steel ball, dropping the steel ball from a position with the height of 120cm, taking the dropping point of the steel ball as the center position of the product, if the steel ball is not broken by 120cm in the test process, increasing the height, testing again from a position of 130cm, and so on until the product is broken.
And (3) edge pressing test: one side of the product is attached to the right-angle side, the cone head is deviated to the position of 0.5mm or 1mm of the product, the product is pressed down at the speed of 5-10mm/min until the product is crushed, and the magnitude of the applied force during crushing is recorded.
Properties of the final product:
the falling ball (solid) performance reaches 64g/1.2 m without breaking;
the falling ball (hollow) performance reaches 64g/1 m without breaking;
the blank pressing test reaches more than 20kgf,
the warping property is less than 0.15 mm;
the pencil hardness test of the product surface reaches 8H;
the processed product has good scratch resistance and drop resistance.
Comparative example 1:
the process flow of the ultrathin high-alumina glass substrate (2D) is as follows:
high aluminum sheet → cutting → CNC molding → ultrasonic cleaning → one-time chemical strengthening → ultrasonic cleaning → silk screen printing → ultrasonic cleaning → inspection → adhesive back → finished product.
In comparison to example 1, flat grinding was reduced after CNC and finish polishing was reduced at one chemical strengthening. The other processing steps remained unchanged from example 1.
A comparison of the properties of example 1 with those of comparative example 1 is shown in Table 1.
TABLE 1
| Serial number | Ball (solid) | Ball (hollow) | Edge pressing test | Warping (surface flatness) |
| Example 1 | 64g/1.2 m | 64g/1 m | 20Kgf or more | ＜0.15 |
| Comparative example 1 | 64g/0.9 m | 64g/0.7 m | 15Kgf or more | ＜0.25 |
The final performance comparison of example 1 and comparative example 1 shows that the performance of the product with the added flat grinding and fine polishing is improved by more than 30% compared with the product without the added flat grinding and fine polishing. The warpage (flatness) is reduced remarkably.
Example 2:
the process flow of the ultrathin high-alumina glass substrate (2.5D) is as follows:
high aluminum sheet → cutting → CNC molding → scanning → upper scanning and lower grinding → ultrasonic cleaning → one-time chemical strengthening → fine polishing → ultrasonic cleaning → silk screen → ultrasonic cleaning → inspection → adhesive back → finished product
Compared with the embodiment 1, the CNC forming process has a 2.5D cambered surface finishing step, and a sweeping and up-sweeping and down-grinding process is added after the CNC forming process. The 2.5D cambered surface finishing and sweeping processes are different.
The method specifically comprises the following steps:
CNC molding: the CNC forming in example 2 and the CNC forming in example 1 add 2.5D finishing items, the 2.5D cambered surface finishing adopts feeding 2500-: 800# -1200 #.
Description of the scanning procedure: the 2.5D cambered surface of the product after CNC forming is a rough surface, and the 2.5D surface is very smooth after the polishing process. The product is subjected to sweeping on a sweeping machine, the sweeping time is 30-60s generally, and the concentration of sweeping powder is 1.1-1.2 g/ml;
description of the Up-sweep Down-grinding Process: the process is added after the light sweeping, so that the apparent quality of the surface of the product can be improved. The processing technological parameters are as follows: the time was 300s, the rotational speed was 40rpm, and the concentration of the polishing powder was 1.2 g/ml.
The obtained product performance data:
due to the fact that the product processing in the example 2 and the sweeping and grinding processes are added in the example 1, the surface finish of the product is improved by 30%. The product of example 2 therefore had better performance after strengthening.
The test result is
The falling ball (solid) performance reaches 64g/1.4 m without breaking;
the falling ball (hollow) performance reaches 64g/1.2 m without breaking;
the blank pressing test reaches more than 20kgf,
the warping property is less than 0.15 mm;
the pencil hardness test of the product surface reaches 8H;
the processed product has good scratch resistance and drop resistance.
Example 3:
the process flow of the ultrathin high-alumina glass substrate (3D) is as follows:
high aluminum original sheet → cutting → flat grinding → CNC molding → ultrasonic cleaning → 3D hot bending → light sweeping → ultrasonic cleaning → one-time chemical strengthening → fine polishing → ultrasonic cleaning → inspection → adhesive gum → finished product.
The difference between example 3 and example 1 is 3D hot bending.
The processing steps and parameters of the 3D hot bending procedure are as follows: placing the product subjected to CNC molding → ultrasonic cleaning on a mold, and preheating, pressure maintaining molding and heat dissipation steps are carried out on the product inside the mold to obtain a 3D hot-bent product. Preheating is as follows: heating to the pressure maintaining and forming temperature from the room temperature of 25 ℃; setting the pressure maintaining and forming temperature to 650-700 ℃, the pressure maintaining time to 20-30S, taking out the product after the pressure maintaining and forming process is finished, and cooling at room temperature.
The performance test data of the 3D product are as follows:
the falling ball (solid) performance reaches 64g/1 m without breaking;
the falling ball (hollow) performance reaches 64g/0.8 m without breaking;
the warping property is less than 0.10 mm;
the pencil hardness test of the product surface reaches 8H;
the processed product has good scratch resistance and drop resistance.
Example 4:
the process flow of the ultrathin lithium-aluminum-silicon glass substrate (2D) is as follows
Lithium aluminum silicate glass raw sheet → cutting → CNC molding → flat grinding → ultrasonic cleaning → secondary chemical strengthening → fine polishing → ultrasonic cleaning → silk screen printing → ultrasonic cleaning → inspection → adhesive gum → finished product.
In the original lithium-silicon-aluminum glass sheet, SiO is calculated by mass fraction2At 64%, Al2O3At 19%, Li2O is 6%, Na2O is 10 percent.
Example 4 is compared with example 1, and the procedure of example 1 is changed from the first chemical strengthening to the second chemical strengthening.
Secondary chemical strengthening:
the first strengthening process in the secondary chemical strengthening comprises the following steps: preheating the product for 0.5 h; the temperature is 310 ℃; the mixed salt solution of 80 percent of sodium nitrate and 20 percent of potassium nitrate in the strengthening salt solution is used, the temperature is 400 ℃, and the time is 60 min; after the strengthening is finished, heat dissipation is carried out at room temperature to the temperature below 50 ℃;
the secondary chemical strengthening process comprises the following steps: preheating the product obtained in the first strengthening step for 0.5 h; the temperature is 310 ℃; 4 percent of sodium nitrate and 96 percent of potassium nitrate are mixed in the strengthening salt solution, the temperature is 380 ℃, and the time is 50 min; after the strengthening is finished, heat dissipation is carried out at room temperature to the temperature below 50 ℃;
example 4 the performance test data is shown in table 2.
TABLE 2
| Serial number | Ball (solid) | Ball (hollow) | Edge pressing test | Warping (surface flatness) |
| Example 1 | 64g/1.2 m | 64g/1 m | 20Kgf or more | ＜0.15 |
| Examples4 | 64g/1.4 m | 64g/1.2 m | 25Kgf or more | ＜0.10 |
From the above data, it can be seen that the performance data in example 4 is about 20% better than that in example 1. The main reason is the secondary strengthening process of the lithium aluminum silicate glass body. The performance of the product after being strengthened is improved to a certain extent by the two ion exchange processes.
Claims (10)
1. A method for manufacturing an ultrathin glass substrate is characterized in that: the thickness of the ultrathin glass substrate is 0.2-0.4 mm, and the specific manufacturing method comprises the following steps:
1) cutting the glass sheet, wherein the size of the cut glass is larger than that of the product;
2) molding the glass cut in the step 1) by adopting a CNC (computerized numerical control) process, and then carrying out flat grinding treatment, wherein the treatment time is 240-40 rpm, the grinding disc rotating speed is 20-40rpm, and the flat grinding polishing powder concentration is matched according to 1.0-1.2 g/ml;
3) the glass is subjected to strengthening and fine polishing treatment, ultrasonic cleaning is carried out before strengthening and after strengthening fine polishing, and the fine polishing process comprises the following steps: the time is 60S-120S, the rotating speed of a grinding disc is 20-40rpm, and the concentration of the flat grinding polishing powder is proportioned according to 0.8-1.0 g/ml; and sequentially carrying out silk-screen printing treatment, ultrasonic cleaning, inspection and gum pasting to obtain the ultrathin glass substrate product.
2. The manufacturing method according to claim 1, characterized in that: during cutting in the step 1), the sizes of the cut glass in the length direction and the width direction are 0.8-1.0mm larger than the size of a product, wherein the size of a single side is 0.40-0.50mm larger.
3. The manufacturing method according to claim 1, characterized in that: and step 1) when the CNC process is adopted for forming, removing four corners, roughing the appearance and finishing the appearance, and selectively finishing the 2.5D cambered surface according to the product requirement.
4. The manufacturing method according to claim 1 or 3, characterized in that: step 2), performing 3D hot bending treatment according to product requirements after molding, performing ultrasonic cleaning before the 3D hot bending treatment, performing light sweeping after the 3D hot bending treatment, and performing the operation of the step 3); or directly performing circular arc polishing on the 2.5D product formed in the step 2), performing the operation of the step 3) after performing upper scanning and lower grinding, wherein the upper scanning and lower grinding process is performed by adopting the same process parameters as the flat grinding in the step 2).
5. The manufacturing method according to claim 1, characterized in that: the glass raw sheet is high-alumina glass, primary chemical strengthening is adopted during strengthening treatment in the step 3), and potassium nitrate with the purity of more than 99.9 percent is adopted as a strengthening salt solution; preheating is carried out before product strengthening, wherein the preheating temperature is 300-340 ℃, and the preheating time is 0.5-1 h; transferring the preheated product into a strengthening salt solution, controlling the strengthening temperature to be 390-430 ℃, and strengthening the product for 60-120 minutes; and (4) placing the strengthened product into room temperature for heat dissipation, and carrying out the next procedure operation when the temperature of the product is reduced to below 50 ℃.
6. The manufacturing method according to claim 5, characterized in that: in the high-alumina glass, SiO is present by mass255-60% of Al2O313% -18% of Na2O is 10% -15%, P5O22 to 4 percent.
7. The manufacturing method according to claim 5, characterized in that: the glass sheet is lithium silicon aluminum glass, secondary strengthening is adopted during strengthening treatment in the step 3), wherein the content of sodium nitrate in primary strengthening salt solution is 80-100wt%, the balance is potassium nitrate, the strengthening temperature is 395-430 ℃, and the strengthening time is 30-60 minutes; during secondary strengthening, the content of sodium nitrate is 0-4wt%, the rest is potassium nitrate, the strengthening temperature is 380-395 ℃, and the strengthening time is 30-60 minutes; preheating the product before each strengthening, wherein the preheating temperature is 300-340 ℃, and the preheating time is 0.5-1 h; after the strengthening, the heat dissipation is carried out until the temperature of the product is reduced to below 50 ℃, and then the next working procedure operation is carried out.
8. The manufacturing method according to claim 7, characterized in that: the lithium-silicon-aluminum glass is SiO by mass2Over 60% of Al2O3Above 18% of Li2O is more than 5 percent and Na2O is more than 10 percent.
9. The manufacturing method according to claim 1, characterized in that: and 3) performing performance test after the strengthening treatment, wherein the performance test specifically comprises a warping test, a hollow ball falling test, a solid ball falling test and an edge pressing test.
10. The manufacturing method according to claim 1, characterized in that: the ultrathin glass substrate product is a 2D, 2.5D or 3D product.
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