Overflow brick and method for optimizing the design of its groove bottom curve

Abstract

This invention relates to the field of glass substrate manufacturing and discloses a method for optimizing the design of overflow bricks and their groove bottom curves. The method includes steps S1: obtaining a standard overflow brick extension length according to the overflow brick design parameters; S2: obtaining an initial overflow brick groove bottom curve according to the standard overflow brick extension length; S3: linearly correcting the initial overflow brick groove bottom curve according to the length of the overflow brick shunt block to obtain an overflow brick groove bottom curve; S4: obtaining an extreme thickness difference of the formed glass substrate through overflow simulation according to the overflow brick groove bottom curve and the overflow brick design parameters; and S5: machining the overflow bricks using the overflow brick groove bottom curve and the overflow brick design parameters if the extreme thickness difference of the formed glass substrate is less than or equal to a predetermined threshold. If the extreme thickness difference of the formed glass substrate is greater than the predetermined threshold, adjusting the overflow brick design parameters and repeating steps S1 to S4. This solves the problem of glass substrate thickness variation and increases production margins in the design, thereby ensuring that the formed glass substrate thickness meets requirements.

Description

Technical Field

[0001] The present invention belongs to the field of glass substrate manufacturing, Overflow Brick and relates to a method for optimizing the design of the groove bottom curve thereof.

Background Art

[0002] The glass substrates used in the field of flat panel display manufacturing such as general TFT-LCD (Thin Film Transistor Display), PDP (Plasma Display Panel), etc. are manufactured by the overflow down-draw method. In the forming process, the molten glass melted in a glass melting furnace is supplied to a molten overflow down-draw forming device for manufacturing.

[0003] In the manufacture of displays, larger glass substrates are increasingly required to improve production efficiency and reduce costs. However, the larger the glass substrate, the more difficult the production becomes, and the quality control of the glass substrate becomes more complicated. Overflow Brick is one of the core members of the glass substrate manufacturing and forming device. Among them, the control of the thickness uniformity of the glass substrate is one of the particularly important process technologies. Taking a 0.7 mm glass substrate as an example, its thickness variation needs to be within about 20 um or 30 um. Overflow Brick The quality of the structure design and the size of the process margin are one of the important factors for the stability of the forming process. To avoid instantaneous changes in the mass distribution and thermal distribution caused by the glass, Overflow Brick control the flow rate and balance of the sideboards at the far end and near end of the, and adjust the flow rate, temperature, etc. according to the overall initial thickness distribution to adjust the forming process. That is, using the overflow down-draw method, strict requirements are imposed on the characteristics such as stress, warp, thickness, and bending of the plate material, and a glass substrate with stable performance is manufactured. Controlling the thickness and its consistency of the glass substrate is one of the very important design and process technologies. Since the glass substrate is very thin, any process variation, including the air flow and thermal field in the production process, will affect the thickness of the formed glass substrate, and the thickness distribution of the produced glass substrate does not meet the requirements, further affecting the quality of the display. Overflow BrickIn design, it is necessary to consider the influence of these complex factors on the thickness distribution of the glass substrate, that is, to increase the production margin in the design, and in contrast to this, the overall thickness distribution of the glass substrate Thickness range Determine <15μm

[0004] Ensuring that the thickness distribution of the glass substrate meets the requirements is one of the critical process control and quality control items in glass substrate manufacturing, and is one of the most difficult problems in glass substrate production. [Overview of the project]

[0005] The present invention overcomes the drawback that the thickness distribution of glass substrates manufactured by the overflow downdraw method in the above-mentioned conventional technology does not always meet the requirements. Overflow Brick The objective is to provide a method for optimizing the design of the groove bottom curve.

[0006] To achieve the above objectives, the present invention is realized by employing the following technical solutions. Overflow Brick A method for optimizing the design of the groove bottom curve, Overflow Brick According to the design parameters, Overflow Brick S1 obtains the standard withdrawal amount, Overflow Brick Design parameters and Overflow Brick According to the standard withdrawal amount, initial Overflow Brick S2 obtains the groove bottom curve, Initially, depending on the length of the overflow brick shunt block Overflow Brick The groove bottom curve is corrected to a straight line, Overflow Brick S3 obtains the groove bottom curve, Overflow Brick Groove bottom curve and Overflow Brick According to the design parameters, the molded glass substrate is processed by overflow simulation. Thickness range S4 to retrieve, Molded glass substrate Thickness range If the threshold is ≤ a pre-set threshold, Overflow Brick Groove bottom curve and Overflow Brick Using the design parameters Overflow BrickThe processing is performed, Molded glass substrate Thickness range >If it is a pre-set threshold, Overflow Brick Adjust the design parameters and repeat S1-S4, including S5.

[0007] Further improvements to the present invention are as follows: In S1, Overflow Brick The design parameters are obtained from the production line and product design. Overflow Brick This includes the groove inlet height, groove inlet width, overflow surface length, overflow weir inclination angle, and design pull-out amount.

[0008] In S1, Overflow Brick The specific method for obtaining the standard withdrawal amount includes the following steps: S101, by formula (1) JPEG0007854388000001.jpg11170JPEG0007854388000002.jpg14170In the formula, JPEG0007854388000003.jpg9170 is the density of glass, JPEG0007854388000004.jpg12170JPEG0007854388000005.jpg9170 This is the acceleration due to gravity, JPEG0007854388000006.jpg11170JPEG0007854388000007.jpg9170This is the molding viscosity of glass. JPEG0007854388000008.jpg10170S102, by formula (2) JPEG0007854388000009.jpg12170JPEG0007854388000010.jpg11170In the formula, JPEG0007854388000011.jpg10170 This is the surface tension angle of glass. S103, by formula (3) Overflow Brick Overflow surface of unit length JPEG0007854388000012.jpg11170JPEG0007854388000013.jpg13170In the formula, JPEG0007854388000014.jpg10170 Overflow Brick is the standard extraction amount, JPEG0007854388000015.jpg11170JPEG0007854388000016.jpg10170is the length of the overflow surface, JPEG0007854388000017.jpg10170S104, for the overflow groove by Equation (4) JPEG0007854388000018.jpg10170JPEG0007854388000019.jpg16170S105, for the overflow groove by Equation (5) JPEG0007854388000020.jpg10170JPEG0007854388000021.jpg13170Where, JPEG0007854388000022.jpg10170 Overflow Brick is the groove inlet height, JPEG0007854388000023.jpg11170 Overflow Brick is the groove inlet width. S106, by Equation (6) JPEG0007854388000024.jpg11170is calculated, and the calculation formula is as follows. TIFF0007854388000025.tif17170S107, by Equation (7) Overflow Brick of JPEG0007854388000026.jpg10170TIFF0007854388000027.tif9170S108, combining Equations (1) to (7), Overflow Brick of JPEG0007854388000028.jpg10170

[0009] TIFF0007854388000029.tif25170

[0010] JPEG0007854388000030.jpg11170JPEG0007854388000031.jpg10170

[0011] The specific method of S2 described above includes the following steps. S201, Overflow Brick overflow surface JPEG0007854388000032.jpg10170 and The file is JPEG0007854388000033.jpg8170, and each equal part is one Supports JPEG0007854388000034.jpg10170, JPEG0007854388000035.jpg11170S202, combine equations (1) to (8), Overflow Brick overflow surface Each equal division corresponds to TIFF0007854388000036.tif10170 Corresponds to TIFF0007854388000037.tif10170 Overflow Brick of Retrieve and record TIFF0007854388000038.tif10170, and then... Overflow Brick Obtain the groove bottom curve, TIFF0007854388000039.tif9170 formula, TIFF0007854388000040.tif7170 is Overflow Brick This is the inclination angle of the overflow weir.

[0012] The specific method of S3 described above includes the following steps. S301, Overflow Brick Shunt Block According to JPEG0007854388000041.jpg11170, Overflow Brick Overflow surface JPEG0007854388000042.jpg was divided into 111702 sections, and each section Initial data obtained in JPEG0007854388000043.jpg11170S302, S2 Overflow Brick The groove bottom curve as well JPEG0007854388000044.jpg11170JPEG0007854388000045.jpg11170JPEG0007854388000046.jpg10170S303, JPEG0007854388000047.jpg12170JPEG0007854388000048.jpg12170 Connect to a straight line and perform straight line correction, Overflow Brick Obtain the groove bottom curve.

[0013] The specific method of S4 is as follows: Overflow Brick Groove bottom curve and Overflow Brick According to the design parameters, an overflow simulation was performed using the fluid software FLUENT for the molded glass substrate. The goal is to obtain TIFF0007854388000049.tif10170.

[0014] The specific method of S5 is as follows: Molded glass substrate Thickness range If the threshold is ≤ a pre-set threshold, Overflow Brick Groove bottom curve and Overflow Brick Using the design parameters Overflow Brick The processing is performed, Molded glass substrate Thickness range >If it is a pre-set threshold, Overflow Brick of Adjust JPEG0007854388000050.jpg10170 and repeat S4. Overflow Brick of Adjust JPEG0007854388000051.jpg10170 and repeat S1~S4, or Overflow Brick of JPEG0007854388000052.jpg10170 and Overflow Brick of This involves adjusting JPEG0007854388000053.jpg11170 and repeating steps S1 to S4.

[0015] Compared to conventional technologies, the present invention has the following beneficial effects. This method first involves the production line and product design, Overflow Brick Determine the design parameters, and then, Overflow Brick By calculating the standard extraction amount, combining overflow fluid parameters related to the viscosity and density of the glass, glass surface tension parameters, and overflow height related to the glass overflow thickness of the overflow weir, the groove bottom curve is designed and calculated, and overflow simulation is performed using fluid software to verify and optimize the design. Overflow Brick Early Thickness range This ultimately satisfies the design objectives, effectively resolves the problem of variations in the molding thickness of the glass substrate, and increases the production margin in the design, allowing the molding thickness of the glass substrate to meet the requirements, further reducing the complexity of process adjustments and maintaining the stability of the production line. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic diagram of the overflow system structure. [Figure 2] This is a schematic diagram of the external structure of an overflow brick. [Figure 3] This is a schematic diagram of the structure of the overflow groove within the overflow brick. [Figure 4] This is a flowchart of the method for optimizing the groove bottom curve design of an overflow brick according to the present invention. [Figure 5] This is an example of optimizing the groove bottom curve design of an overflow brick according to the present invention. [Modes for carrying out the invention]

[0017] To enable those skilled in the art to better understand the means of the present invention, the technical methods in the embodiments of the present invention are described below in clear and complete terms, with reference to the drawings of the embodiments. Of course, the embodiments described are not all embodiments, but only a selection of embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments that those skilled in the art can obtain without creative effort are all within the scope of the present invention.

[0018] As necessary for explanation, terms such as “First,” “Second,” etc., in the specification, claims, and drawings above are used (if present) to distinguish similar objects and are not used to describe a particular order or sequence. It should be understood that data used in this manner may be interchangeable under appropriate circumstances, so that the embodiments of the present application described herein may be carried out in an order other than that illustrated or described herein. Furthermore, the terms “includes” and “has” and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that includes a series of steps or units does not have to be limited to those steps or units explicitly mentioned, and may include other steps or units that are not explicitly mentioned or are specific to those processes, methods, products, or apparatus.

[0019] The present invention will be described in more detail below, using the drawings as a reference. Refer to Figure 1, which is a schematic diagram of the structure of the overflow system. Overflow Brick It is constructed by connecting 1 and the molten glass supply device 3. Overflow Brick An overflow groove 2 is made inside 1. Overflow Brick The bottom of 1 is Overflow Brick In the case of manufacturing the base of 1, a glass substrate by melt overflow, the molding process involves supplying molten glass melted in a glass melting furnace to a molten glass supply device 3 in a melt overflow molding apparatus, along the overflow groove 2. Overflow Brick Overflow through both sides of 1, Overflow Brick 1 Overflow Brick A glass substrate is formed from below the base 4.

[0020] Refer to Figures 2 and 3. Figure 2 shows the manufacturing of a glass substrate using the overflow downdraw method. Overflow Brick Figure 3 is a schematic diagram of the external structure. Overflow Brick This is a schematic diagram of the internal overflow groove structure, and in the diagram, Overflow Brick of JPEG0007854388000054.jpg10170 Overflow surface JPEG0007854388000055.jpg11170 Overflow Weir TIFF0007854388000056.tif7170, Overflow groove overflow height, overflow Brick Shunt block 5 JPEG0007854388000057.jpg10170 and Overflow Brick Overflow groove This shows important structural design dimensions, including JPEG0007854388000058.jpg10170, and how they are used in actual production. Overflow Brick All of these include the parameters mentioned above, and of course, also include the overflow groove bottom curve.

[0021] Refer to Figure 4, which illustrates the present invention. Overflow Brick This is a flowchart for optimizing the groove bottom curve design, which includes the following steps: First, according to the production line and product design, Overflow Brick of JPEG0007854388000059.jpg11170 Overflow surface JPEG0007854388000060.jpg11170 Overflow Weir TIFF0007854388000061.tif7170, The first step is to determine JPEG0007854388000062.jpg10170, and then, Overflow Brick of By calculating JPEG0007854388000063.jpg11170, combining overflow fluid parameters related to glass viscosity and density, glass surface tension parameters, and overflow height related to the glass overflow thickness of the overflow weir, the groove bottom curve is designed and calculated, and overflow simulation is performed using specialized fluid software (e.g., FLUENT) to verify and optimize the design. Overflow Brick of TIFF0007854388000064.tif10170 includes the steps to finally satisfy the design objectives. Specifically, it includes the following steps: S1, Overflow Brick According to the design parameters, Overflow Brick Get the standard withdrawal amount. Overflow Brick The design parameter 1 is obtained based on the production line and product design. Overflow Brick 1 JPEG0007854388000065.jpg11170 Overflow surface JPEG0007854388000066.jpg11170 Overflow Weir TIFF0007854388000067.tif10170. Overflow Brick The specific method for obtaining the standard withdrawal amount includes the following steps: S101, by formula (1) Calculate JPEG0007854388000068.jpg10170, JPEG0007854388000069.jpg13170In formula, JPEG0007854388000070.jpg8170 This is the density of glass. JPEG0007854388000071.jpg10170JPEG0007854388000072.jpg9170 This is the acceleration due to gravity, JPEG0007854388000073.jpg11170JPEG0007854388000074.jpg8170This is the molding viscosity of glass. The image is JPEG0007854388000075.jpg10170, and the design value is generally 35000 poise, but other design values ​​may also be used. S102, by formula (2) JPEG0007854388000076.jpg11170JPEG0007854388000077.jpg11170In the formula, JPEG0007854388000078.jpg10170 This is the surface tension angle of glass, The image is JPEG0007854388000079.jpg10170, and different tension angles may be used depending on the specific glass. S103, by formula (3) Overflow Brick unit length overflow surface JPEG0007854388000080.jpg10170JPEG0007854388000081.jpg11170In the formula, JPEG0007854388000082.jpg9170 Overflow Brick This is the standard withdrawal amount. JPEG0007854388000083.jpg11170JPEG0007854388000084.jpg10170This is the length of the overflow surface, JPEG0007854388000085.jpg9170S104, by formula (4) the overflow groove JPEG0007854388000086.jpg11170JPEG0007854388000087.jpg16170S105, by formula (5) the overflow groove JPEG0007854388000088.jpg11170JPEG0007854388000089.jpg13170 During the ceremony, JPEG0007854388000090.jpg10170 Overflow Brick This is the height of the groove entrance. JPEG0007854388000091.jpg10170 Overflow Brick This is the width of the groove entrance. S106, by formula (6) The calculation for JPEG0007854388000092.jpg10170 is as follows: TIFF0007854388000093.tif17170S107, by formula (7) Overflow Brick of JPEG0007854388000094.jpg10170TIFF0007854388000095.tif10170S108, combine formulas (1) to (7), Overflow Brick of Retrieve JPEG0007854388000096.jpg10170, Overflow Brick of JPEG0007854388000097.jpg10170> Overflow Brick of JPEG0007854388000098.jpg10170S2, Overflow Brick Design parameters and Overflow Brick According to the design of the standard draw amount, initial Overflow Brick Obtain the groove bottom curve. S201, Overflow Brick overflow surface JPEG0007854388000099.jpg10170 Each equal part is one JPEG0007854388000100.jpg10170S202, combine equations (1) to (8), Overflow Brick overflow surface Each equal division corresponds to JPEG0007854388000101.jpg10170 JPEG0007854388000102.jpg11170 Overflow Brick of Retrieve and record JPEG0007854388000103.jpg9170, initial Overflow Brick Obtain the groove bottom curve, TIFF0007854388000104.tif9170In formula, TIFF0007854388000105.tif7170 is Overflow Brick This is the inclination angle of the overflow weir. S3, Overflow Brick Initially, according to the length of shunt block 5 Overflow Brick The groove bottom curve is corrected to a straight line, Overflow Brick Obtain the groove bottom curve. S301, Overflow Brick Shunt Block 5 According to JPEG0007854388000106.jpg10170, Overflow Brick Overflow surface JPEG0007854388000107.jpg11170 was split into two sections, and each section was Initial data obtained in JPEG0007854388000108.jpg10170S302, S2 Overflow Brick The groove bottom curve as well The image was split into two sections, resulting in JPEG0007854388000109.jpg10170. JPEG0007854388000110.jpg11170JPEG0007854388000111.jpg10170S303, This corresponds to JPEG0007854388000112.jpg11170. Connect JPEG0007854388000113.jpg10170 to a straight line and perform straight line correction. Overflow Brick Obtain the groove bottom curve. S4, Overflow Brick Groove bottom curve and Overflow Brick According to the design parameters, an overflow simulation was performed using the fluid software FLUENT for the molded glass substrate. Retrieve TIFF0007854388000114.tif10170. S5, molded glass substrate Thickness range If the threshold is ≤ a pre-set threshold, Overflow Brick Groove bottom curve and Overflow Brick Using the design parameters Overflow Brick The processing is performed, Molded glass substrate Thickness range >If it is a pre-set threshold, Overflow Brick of Adjust JPEG0007854388000115.jpg10170 and repeat S4. Overflow Brick of Adjust JPEG0007854388000116.jpg10170 and repeat S1~S4, or Overflow Brick of JPEG0007854388000117.jpg10170 and Overflow Brick of Adjust JPEG0007854388000118.jpg10170 and repeat steps S1 to S4.

[0022] This method first involves the production line and product design, Overflow BrickDetermine the design parameters, and then, Overflow Brick By calculating the standard extraction amount of 1, combining overflow fluid parameters related to the viscosity and density of the glass, glass surface tension parameters, and overflow height related to the glass overflow thickness of the overflow weir, etc., the groove bottom curve is designed and calculated, and overflow simulation is performed using fluid software to verify and optimize the design. Overflow Brick Early Thickness range This ultimately satisfies the design objectives, effectively resolves the problem of variations in the molding thickness of the glass substrate, and increases the production margin in the design, allowing the molding thickness of the glass substrate to meet the requirements, further reducing the complexity of process adjustments and maintaining the stability of the production line.

[0023] Refer to Figure 5, which is a reference according to the present invention. Overflow Brick This is an example of optimizing the design of the groove bottom curve. Overflow Brick Optimized JPEG0007854388000119.jpg10170259.254mm, JPEG0007854388000120.jpg is 10170200.032mm, and the overflow surface JPEG0007854388000121.jpg is 101702973mm, and is an overflow weir. TIFF0007854388000122.tif7170 is 6.0°, JPEG0007854388000123.jpg is 1017020 tons / day, Thickness range The target is smaller than 70 μm. Initial in Figure 5. Overflow Brick Groove bottom curve 6 and Overflow Brick The groove bottom curve 7 was simulated using FLUENT fluid software. Thickness range This is 68.52 μm, which fully meets the design target. In other embodiments, Overflow Brick Optimized The file size is JPEG0007854388000124.jpg9170265.308mm. JPEG0007854388000125.jpg is 10170204.855mm, and the overflow surface JPEG0007854388000126.jpg91702973mm, overflow weir TIFF0007854388000127.tif7170 is 6.0°, JPEG0007854388000128.jpg is 1017022 tons / day, Thickness range The target is smaller than 70 μm. We will perform simulations using FLUENT fluid software. Thickness range This is 67.95 μm, which perfectly meets the design target.

[0024] The above is merely to explain the technical concept of the present invention and does not limit the scope of protection of the present invention. Any modification made to the technical proposal in accordance with the technical concept of the present invention falls within the scope of protection of the claims of the present invention. [Explanation of Symbols]

[0025] 1- Overflow Brick 2- Overflow groove 3. Molten glass supply device 4- Overflow Brick base 5. Shunt Block 6-Initial Overflow Brick Groove bottom curve 7- Overflow Brick Groove bottom curve

Claims

1. A method for optimizing the groove bottom curve design of an overflow brick, S1 obtains the standard draw amount of the overflow brick according to the design parameters of the overflow brick, S2 obtains an initial overflow brick groove bottom curve according to the design parameters of the overflow brick and the standard pull-out amount of the overflow brick. S3 involves linearizing the initial overflow brick groove bottom curve according to the length of the overflow brick shunt block to obtain the overflow brick groove bottom curve, S4 obtains the thickness range of the molded glass substrate by overflow simulation according to the overflow brick groove bottom curve and the design parameters of the overflow brick, If the thickness range of the molded glass substrate is less than or equal to a preset threshold, the overflow brick is processed using the overflow brick groove bottom curve and the design parameters of the overflow brick. If the thickness range of the molded glass substrate is greater than the preset threshold, the design parameters of the overflow brick are adjusted, and S5 is repeated from S1 to S4, including the following: In S1, the design parameters of the overflow brick are obtained by the production line and product design, and include the groove inlet height, groove inlet width, overflow surface length, overflow weir inclination angle, and design pullout amount of the overflow brick. In S1, a specific method for obtaining the standard withdrawal amount of the overflow brick is: S101 is a method for calculating the glass overflow fluid parameter A using equation (1), During the ceremony, This is the density of glass, and the unit is kg / m³. ３ And, Gravitational acceleration, unit: m / s² ２ And, S101 is the molding viscosity of glass, and its unit is poise. S102 is a method for calculating the glass surface tension parameter B using equation (2), During the ceremony, The glass surface tension angle is S102, S103 is a method for calculating the standard flow rate C of the overflow surface of the overflow brick by formula (3), During the ceremony, This is the standard withdrawal amount of the overflow brick, and the unit is kg / s. L is the length of the overflow surface, and its unit is mm, in S103, S104 calculates the overflow height D of the overflow groove using equation (4), S105 is the calculation of the aspect ratio E of the overflow groove by formula (5), During the ceremony, H is the groove inlet height of the overflow brick, and W is the groove inlet width of the overflow brick, S105, S106 is a calculation of the overflow groove section function F using equation (6), wherein the calculation formula is as follows: Formula (7) shows the standard drawout amount Q of the overflow brick. ｓ S107 calculates, Combining equations (1) to (7), the standard drawout amount Q of the overflow brick is obtained. ｓ S108, which obtains, The specific method of S2 is as follows: S201 divides the length L of the overflow surface of the overflow brick into n equal parts, where n ≥ 5, and each equal part corresponds to a groove bottom position Z value, and the Z value is an n-equal value from 0 to L. S202 combines equations (1) to (8) to obtain and record the overflow groove height h of the overflow brick corresponding to the Z value corresponding to each of the n equal divisions of the length L of the overflow surface of the overflow brick, and obtains the initial overflow brick groove bottom curve, During the ceremony, This includes S202, which is the inclination angle of the overflow weir of the overflow brick, The specific method of S3 is as follows: The length L of the overflow brick shunt block ０ Accordingly, the length L of the overflow surface of the overflow brick is set as follows: S301 divides into two stages, The initial overflow brick groove bottom curve obtained in S2 S302 is divided into two stages, The corresponding groove bottom height is The corresponding groove bottom height is S302 is, Corresponding Corresponding S303 includes connecting the lines in a straight line, performing a straight line correction, and obtaining the overflow brick groove bottom curve, The specific method of S4 is as follows: The process involves performing an overflow simulation using Ansys Fluent fluid simulation software according to the overflow brick groove bottom curve and the design parameters of the overflow brick, and obtaining the range Δ of the thickness of the molded glass substrate. A method for optimizing the groove bottom curve design of an overflow brick, characterized in that the standard pull-out amount Qs of the overflow brick is greater than the designed pull-out amount Qd of the overflow brick.

2. The method for optimizing the groove bottom curve design of an overflow brick according to Claim 1, characterized in that the above is performed.

3. The specific method of S5 is as follows: If the thickness range of the molded glass substrate is less than or equal to the preset threshold, the overflow brick is processed using the overflow brick groove bottom curve and the design parameters of the overflow brick. If the thickness range of the molded glass substrate > the preset threshold, then the overflow brick Adjust and repeat S4, the overflow brick Adjust and repeat S1 to S4, or the overflow brick and the overflow brick The method for optimizing the groove bottom curve design of an overflow brick according to claim 1, characterized in that it involves adjusting and repeating steps S1 to S4.

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