Glass substrate forming mold and glass substrate forming method

Abstract

The embodiment of the application discloses a glass substrate forming die and a glass substrate forming method, wherein the glass substrate forming die comprises a die base, a supporting rod and an upper pressing device, and the die base is provided with a shaping device; the supporting rod comprises a telescopic rod and a crossbar, the telescopic rod is vertically installed at one side of the die base, and the crossbar is horizontally installed at one end of the telescopic rod away from the die base; the upper pressing device is installed at one end of the crossbar away from the telescopic rod, and the upper pressing device is located directly above the shaping device and orthogonally projects on the shaping device, so that the upper pressing device can adapt to molten glass liquid with different viscosities to form, and the upper pressing device can automatically form at a relatively high temperature and will not cause explosion of the glass block.

Description

Technical Field

[0001] This invention relates to a glass substrate forming method, forming mold and application, and belongs to the field of testing technology. Background Technology

[0002] The development of new types of glass is becoming increasingly significant for the glass industry. In recent years, with the booming development of the LCD panel industry both domestically and internationally, China's LCD panel display technology has also developed rapidly, especially high-generation LCD panel display technology. From the perspective of the existing LCD panel industry, whether it's TFT-LCD or OLED, glass substrates are one of the important and critical materials required for their production, and are a fundamental component of LCD panels. However, facing the current demand for high-generation glass substrates, the performance requirements for glass substrates are also increasing. The resulting problem is how to control different material compositions to produce corresponding glass substrates, and then test their performance changes before finally putting them into production. Often, this process can only be carried out on a small scale in the laboratory, thus avoiding the energy waste and unpredictable consequences of using production line experiments. Even so, how to adjust the material composition in the laboratory to form an ideal glass substrate from the final molten glass remains a major challenge. Currently, the common method is to use ordinary molds to form blocks, and then use cutting and polishing equipment to thin and polish the glass molten block. This method is wasteful of energy and time, and it cannot be guaranteed that the glass molten block will not experience stress unevenness and cracking during the sample preparation process, posing a danger.

[0003] To address these issues, this invention presents a glass substrate forming method, a forming mold, and its application. The forming mold is simple to operate and can form glass substrates of different thicknesses. Furthermore, the forming mold can adapt to molten glass of varying viscosities, automatically forming at relatively high temperatures without causing the glass blocks to crack, thus ensuring relative safety. The formed glass substrate also guarantees the uniformity and accuracy of test results, greatly aiding in the research and development of high-performance glass substrate materials. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a glass substrate forming mold and a glass substrate forming method, which can adapt to the forming of molten glass of different viscosities, automatically form at relatively high temperatures, and will not cause the glass block to crack.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] This application provides a glass substrate molding die, characterized in that it includes:

[0007] A mold base, on which a shaping device is provided;

[0008] The support rod includes a telescopic rod and a crossbar. The telescopic rod is vertically installed on one side of the mold base, and the crossbar is horizontally installed on the telescopic rod at one end away from the mold base.

[0009] The upper pressing device is installed on the crossbar at one end away from the telescopic rod, and the upper pressing device is located directly above the shaping device, with its projection onto the shaping device.

[0010] Optionally, in some embodiments of this application, the pressing device includes:

[0011] A pressure head, which is installed on the side of the upper pressing device facing the shaping device;

[0012] The counterweight is detachably installed in the upper pressure device;

[0013] A heating device is located in the upper pressure device, and the heating device heats the pressure head.

[0014] Optionally, in some embodiments of this application, the shaping device includes a shaping groove, the position of which corresponds to the position of the pressure head.

[0015] Optionally, in some embodiments of this application, the mold base is further provided with a heating element, which is provided corresponding to the shaping groove.

[0016] Optionally, in some embodiments of this application, the telescopic rod includes an electrically operated telescopic component.

[0017] Optionally, in some embodiments of this application, a glass substrate forming method is also provided, implemented using a glass substrate forming mold as described above, the glass substrate forming method comprising:

[0018] Step 1: Preheat the glass substrate molding mold;

[0019] Step 2: Weigh and melt the glass component raw materials;

[0020] Step 3: Apply ammonium iodide solution to the molding tank;

[0021] Step 4: Pour the molten raw material into the shaping tank, press the molten raw material with the upper pressure device, and increase the pressure to the preset pressure;

[0022] Step 5: After pressing, the glass is annealed and tested to complete the manufacturing process.

[0023] Optionally, in some embodiments of this application, the preset pressure includes 5 bar, 10 bar, and 15 bar.

[0024] Optionally, in some embodiments of this application, the items to be tested include: transmittance, annealing point, strain point, and softening point.

[0025] The molding die in this invention has a wide range of applications and is highly operable.

[0026] The advantage lies in the installation of a silicon carbide heating element inside the mold base, which can provide baking for the mold shaping device;

[0027] The advantage lies in the fact that the mold base includes pressure control and temperature control components, as well as control switches and emergency stop devices;

[0028] The advantage lies in the fact that the pressure control section can guarantee the downward pressure of the pressure head;

[0029] The advantage lies in the fact that the temperature control section can guarantee the temperature of the molten glass it carries;

[0030] The advantage is that ammonium iodide is applied to the mold forming device tank before the high-temperature molten glass is formed, which facilitates the separation of the formed glass substrate from the mold.

[0031] Its advantage lies in the presence of an emergency stop device, which facilitates the timely guarantee of safety in the event of uncontrollable accidents.

[0032] The advantage lies in the fact that the pressing device includes a resistance wire heating device, a built-in counterweight, and a pressure head. The built-in counterweight can automatically adjust the weight according to the set pressure, which is convenient for forming glass of different thicknesses and does not require manual pressure control.

[0033] The advantage lies in the resistance wire heating device included in the upper pressure device, which can keep the upper pressure head at a certain temperature, making it easier to prevent phenomena such as cracking when a cold state is exposed to a hot state.

[0034] The advantage lies in the fact that the designed electric telescopic component can be automatically pressed and molded at high temperature, with a lowering pressing rate of 1.0 to 2.5 mm / min and a holding time of 2 to 5 min;

[0035] The advantage lies in the fact that the mold base is made of refractory zirconium material, with silicon carbide heating elements and external stainless steel sealing and fixing, which can ensure the temperature is concentrated and not easy to dissipate heat, and the preferred temperature range is 600℃~1000℃.

[0036] The advantage lies in the fact that the molding mold has been repeatedly tested and calculated to find that the amount of molten glass m, density ρ, pressing thickness d, and pressing pressure p have a certain relationship, namely p=0.55*m / (ρ*d).

[0037] Compared with the prior art, the beneficial effects of this invention are as follows:

[0038] This invention designs a glass substrate forming method and a forming mold. The forming mold is simple to operate and can form glass substrates of different thicknesses. At the same time, the forming mold of this invention can also adapt to molten glass of different viscosities for forming. It automatically forms at relatively high temperatures without causing the glass block to crack, making it relatively safe. In addition, the formed glass substrate can also ensure the uniformity and accuracy of test results, which is of great help to the research and development of high-performance glass substrate materials. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the overall structure of the glass substrate molding die provided in the embodiments of this application;

[0041] Figure 2 A side view of the glass substrate molding die provided in an embodiment of this application;

[0042] Figure 3 This is a schematic diagram of the overall process of the glass substrate forming method provided in the embodiments of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100. Mold base; 110. Shaping device; 111. Shaping groove; 120. Heating element; 200. Support rod; 210. Telescopic rod; 220. Crossbar; 300. Pressing device; 310. Press head; 320. Counterweight; 330. Heating device. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application. It is understood that the accompanying drawings are provided for reference and illustration only, and are not intended to limit this application. The connection relationships shown in the accompanying drawings are only for clear description and do not limit the connection method.

[0046] This application provides a glass substrate molding die, such as... Figure 1-2 As shown, the glass substrate molding mold mainly includes a mold base 100, a support rod 200, and an upper pressing device 300.

[0047] Specifically:

[0048] A shaping device 110 is provided on the mold base 100. The shaping device 110 includes a shaping groove 111, which is located at the top of the mold base 100. A heating element 120 is provided at the bottom of the shaping groove 111, corresponding to the position of the shaping groove 111. A support rod 200 is provided on one side of the mold base 100. The support rod 200 includes a telescopic rod 210 and a crossbar 220. The telescopic rod 210 is an electrically operated telescopic component, which can drive the movement of the pressing device 300 to automatically press and shape the glass raw material at high temperature. The pressing rate is 1.0-2.5 mm / min, and the holding time is 2-5 min.

[0049] The crossbar 220 is located at one end of the telescopic rod 210. Specifically, the crossbar 220 is horizontally installed on the telescopic rod 210 at the end away from the mold base 100. An upper pressing device 300 is provided at the end of the crossbar 220. The upper pressing device 300 is installed on the crossbar 220 at the end away from the telescopic rod 210, and the upper pressing device 300 is located directly above the shaping device 110, with its orthographic projection onto the shaping device 110.

[0050] The pressing device 300 includes a pressure head 310, a counterweight 320, and a heating device 330, such as Figure 2 As shown, the pressure head 310 is installed on the side of the upper pressing device 300 facing the shaping device 110; the counterweight 320 is detachably installed in the upper pressing device 300; the heating device 330 is located in the upper pressing device 300 and heats the pressure head 310.

[0051] The position of the shaping groove 111 corresponds to the position of the pressure head 310.

[0052] Using this mold, this application embodiment provides a glass substrate forming method, which mainly includes:

[0053] Step 1: Preheat the mold base 100 in the glass substrate forming mold;

[0054] Step 2: Weigh and melt the glass component raw materials;

[0055] Step 3: Apply ammonium iodide solution into the shaping tank 111;

[0056] Step 4: Pour the molten raw material into the shaping tank 111, press the molten raw material with the pressing device 300, and increase the pressure to the preset pressure;

[0057] Step 5: After pressing, the glass is annealed and tested to complete the manufacturing process.

[0058] To verify the applicability of the molding die and the effectiveness and accuracy of its application method, glass substrates of different thicknesses were formed from low-viscosity and high-viscosity materials, respectively, and then performance tests were conducted. In step two, the same process was used for material melting in all embodiments of the present invention, namely, melting was performed using a platinum-rhodium crucible and a high-temperature silicon molybdenum rod lifting furnace. The high-temperature silicon molybdenum rod lifting furnace used silicon molybdenum rods as heating elements. The specific melting procedure was as follows:

[0059] ① The room temperature is increased to 1000℃ at a rate of 10℃ / min;

[0060] ② Increase the temperature from 1000℃ to 1560℃ at a rate of 10℃ / min, and hold at 1560℃ for 2 hours;

[0061] ③ Increase the temperature from 1560℃ to 1600℃ at a rate of 10℃ / min, and hold at 1600℃ for 1 hour;

[0062] ④ Increase the temperature from 1600℃ to 1630℃ at a rate of 10℃ / min, and hold at 1630℃ for 1.5 hours.

[0063] The physical and chemical properties of the molded glass substrates were then tested and compared. The specific comparison process is shown below:

[0064] Example 1

[0065] Glass substrates were formed using low-viscosity sodium-calcium-silicon glass. The mold of this invention was used to form glass substrates of 0.5mm and 1.0mm thickness, and the performance of the glass substrates of corresponding thicknesses was tested. The specific steps are as follows:

[0066] Table 1. Composition of Low Viscosity Sodium-Calcium-Silica Glass Facts

[0067] Components <![CDATA[SiO2]]> <![CDATA[Al2O3]]> CaO MgO <![CDATA[Na2O]]> and quantity mass percentage / % 72.5 3.5 10.8 1.1 12.1 100％ Raw material name Quartz sand Alumina Calcium carbonate magnesium oxide Sodium oxide

[0068] Weigh each group of raw materials according to the raw material mass percentage composition in Table 1 above. The total weight is 600g. After mixing evenly, place the mixture in a platinum-rhodium crucible and then place it in a silicon molybdenum rod lifting furnace for melting.

[0069] Follow the instructions Figure 1 Perform assembly, inspection, and connection of each structure, and preheat the temperature to 1000℃;

[0070] After the fourth procedure is completed, immediately remove the platinum-rhodium crucible containing molten glass and pour the molten glass into the shaping device 110 on the mold base 100 in the forming mold, specifically into the shaping groove 111. Click the pressure setting button, set the pressing pressure to 5 bar, and click the down / up rocker switch to press the 0.5 mm glass substrate.

[0071] Once the pressure display window shows that the actual pressure value is similar to the set pressure value, start the pressure holding process for 2 to 5 minutes.

[0072] After the pressure holding period is over, click the down / up rocker switch to move the pressure head up to the zero position and complete the pressing process.

[0073] After the pressed glass substrate is removed, it is placed in a high-temperature resistance furnace set at 500°C for annealing to relieve stress.

[0074] Repeat the above steps to press a 1.0mm glass substrate and then anneal it to relieve stress.

[0075] After stress relief, glass substrates of 0.5mm and 1.0mm thickness were removed and subjected to physicochemical property testing. Three sets of tests were conducted for each thickness of glass substrate, namely, transmittance (550nm), annealing point, strain point, and softening point. The test results are shown in Table 2 below:

[0076]

[0077] Comparative data from Example 1 show that, after melting with the same raw materials and pressing glass substrates of different thicknesses using molds, the thermal properties, except for the transmittance which is affected by the thickness itself, are basically stable.

[0078] Example 2

[0079] High-viscosity borosilicate glass was used to form glass substrates. The mold of this invention was used to form glass substrates of 0.5mm and 1.0mm thickness, and the performance of the glass substrates of corresponding thicknesses was tested. The specific steps are as follows:

[0080] Table 3. Composition of High Viscosity Borosilicate Glass Facts

[0081]

[0082] 1) Weigh each group of raw materials according to the raw material mass percentage composition in Table 3 above, with a total weight of 600g. After mixing evenly, place the mixture in a platinum-rhodium crucible and then place it in a silicon molybdenum rod lifting furnace for melting.

[0083] 2) Follow the instructions Figure 1 Perform assembly, inspection, and connection of each structure, and preheat the temperature to 1000℃;

[0084] 3) After the fourth step of the program is completed, immediately remove the platinum-rhodium crucible containing the molten glass and pour the molten glass into the shaping device 110 on the mold base 100 in the forming mold, specifically into the shaping groove 111. Click the pressure setting button, set the pressing pressure to 10 bar, and click the down / up rocker switch to press the 0.5 mm glass substrate.

[0085] 4) When the pressure display window shows that the actual pressure value is similar to the set pressure value, start the pressure holding process for 2-5 minutes;

[0086] 5) After the pressure holding period is over, click the down / up rocker switch to move the pressure head up to the zero position and complete the pressing process;

[0087] 6) After pressing, the glass substrate is removed and placed in a high-temperature resistance furnace set at 700℃ for annealing to relieve stress.

[0088] 7) Repeat the above steps to press a 1.0mm glass substrate and then anneal it to relieve stress;

[0089] 8) Remove the 0.5mm and 1.0mm glass substrates after stress relief and perform physicochemical property tests. Three sets of tests were conducted for each thickness of glass substrate, namely, transmittance (550nm), annealing point, strain point, softening point, etc. The test results are shown in Table 4 below:

[0090]

[0091]

[0092] Comparative data from Example 2 show that, after melting with the same raw materials and pressing glass substrates of different thicknesses using molds, the thermal properties remained basically stable except for the transmittance, which was affected by the thickness itself.

[0093] Example 3

[0094] The raw materials already used and produced on the production line are weighed, melted, and then formed and pressed using the mold of this invention. The resulting pressed glass substrate is then subjected to physicochemical property analysis, and its performance is compared with that of glass substrates produced on the production line. The specific steps are as follows:

[0095] Table 5 Composition of Glass Material in Production Line

[0096]

[0097] 1) Weigh each group of raw materials according to the raw material mass percentage composition in Table 1 above, with a total weight of 600g. After mixing evenly, place the mixture in a platinum-rhodium crucible and then in a silicon molybdenum rod lifting furnace for melting.

[0098] 2) Follow the instructions Figure 1 Perform assembly, inspection, and connection of each structure, and preheat the temperature to 1000℃;

[0099] 3) After the fourth procedure is completed, immediately remove the platinum-rhodium crucible containing molten glass and pour the molten glass into the shaping device 110 on the mold base 100 in the forming mold, specifically into the shaping groove 111. Click the pressure setting button, set the pressing pressure to 15 bar, and click the down / up rocker switch to press the 0.5 mm glass substrate.

[0100] 4) When the pressure display window shows that the actual pressure value is similar to the set pressure value, start the pressure holding process for 2-5 minutes;

[0101] 5) After the pressure holding period is over, click the down / up rocker switch to move the pressure head up to the zero position and complete the pressing process;

[0102] 6) After pressing, the glass substrate is removed and placed in a high-temperature resistance furnace set at 700℃ for annealing to relieve stress.

[0103] 7) Remove 0.5mm of the stress-relieved glass substrate and take a 300*300mm production line glass substrate. Perform physicochemical property tests on each substrate, corresponding to 3 sets of tests, namely, transmittance (550nm), annealing point, strain point, softening point, etc. The test results are shown in Table 6 below:

[0104]

[0105] Comparative data from Example 3 show that the physical and chemical properties of glass substrates produced by molding and pressing with the same raw materials are basically consistent with those of glass substrates produced on the production line.

[0106] Through the above verification of different embodiments, it is evident that the molding mold of the present invention has a wide range of applications, which is sufficient to prove that the present invention meets the requirements of actual use. Furthermore, through the operation process of the embodiments, it is not difficult to find that the operation process is simple, the molding thickness range is relatively wide, and the performance of the molded glass substrate is relatively stable, which can meet the ever-increasing pursuit of high-performance glass substrates in today's society.

[0107] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A method for forming a glass substrate, characterized in that, The glass substrate forming method includes: Step 1: Preheat the mold base (100) in the glass substrate forming mold; Step 2: Weigh and melt the glass component raw materials; Step 3: Apply ammonium iodide solution into the shaping tank (111); Step 4: Pour the molten raw material into the shaping tank (111), press the molten raw material with the pressing device (300), and increase the pressure to the preset pressure; Step 5: After pressing, the glass is annealed and tested to complete the manufacturing process.

2. The glass substrate forming method according to claim 1, characterized in that, The preset pressures include 5 bar, 10 bar, and 15 bar.

3. The glass substrate forming method according to claim 1, characterized in that, The tests include: transmittance, annealing point, strain point, and softening point.

4. A glass substrate forming mold, used to perform a glass substrate forming method as described in any one of claims 1-3, characterized in that, include: A mold base (100) is provided with a shaping device (110); The support rod (200) includes a telescopic rod (210) and a crossbar (220). The telescopic rod (210) is vertically installed on one side of the mold base (100), and the crossbar (220) is horizontally installed on the telescopic rod (210) at one end away from the mold base (100). The pressing device (300) is installed on the crossbar (220) at one end away from the telescopic rod (210), and the pressing device (300) is located directly above the shaping device (110) and is projected onto the shaping device (110).

5. A glass substrate forming mold according to claim 4, characterized in that, The pressing device (300) includes: A pressure head (310) is installed on the side of the upper pressing device (300) facing the shaping device (110); The counterweight (320) is detachably installed in the upper pressure device (300); A heating device (330) is located in the upper pressure device (300), and the heating device (330) heats the pressure head (310).

6. A glass substrate forming mold according to claim 5, characterized in that, The shaping device (110) includes a shaping groove (111), the position of which corresponds to the position of the pressure head (310).

7. A glass substrate forming mold according to claim 6, characterized in that, The mold base (100) is also provided with a heating element (120), which is provided in relation to the shaping groove (111).

8. A glass substrate forming mold according to claim 4, characterized in that, The telescopic rod (210) includes an electrically operated telescopic component.

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