A method for evaluating the molding quality of glass substrates

Abstract

This invention discloses a method for evaluating the molding quality of glass substrates. This evaluation method is implemented through the following steps: S1: Calculate the non-shrinkage edge plate flow rate Q of the manufactured glass substrate using the manufacturing outflow Q0 of the overflow brick used to manufacture the glass substrate, the manufacturing molding viscosity η of the glass substrate, and the structural value of the overflow brick in the production line. E0 S2: The flow rate Q of the glass substrate without shrinkage, obtained from S1. E0 The flow rate Q of the lead plate side plate E Perform calculations; S3: The flow rate Q of the glass substrate without shrinkage, obtained from S1 and S2. E0 and the flow rate Q of the lead plate and side plate E Calculations were performed to obtain the following glass substrate molding quality parameters: thickness distribution δ(z), thickness range Δ, and average edge plate thickness T. E The molding quality of the glass substrate is evaluated based on molding quality parameters. This effectively solves the process problems of on-site molding of the lead plate after the lead-out amount is increased, thereby optimizing the molding thickness distribution of the glass substrate, effectively increasing the edge plate allowance, and ensuring the molding quality of the glass substrate.

Description

Technical Field

[0001] This invention relates to the field of substrate glass quality evaluation, specifically a method for evaluating the molding quality of glass substrates. Background Technology

[0002] In the manufacturing of flat panel displays such as TFT-LCDs (Thin Film Transistor Displays) and PDPs (Plasma Display Panels), glass substrates are typically manufactured using an overflow pull-down process. In this process, molten glass from a glass melting furnace is supplied to a molten overflow pull-down forming device. Display manufacturing demands increasingly larger glass substrates to improve production efficiency and reduce costs; however, larger substrates are more difficult to manufacture and their quality control becomes more complex.

[0003] Overflow bricks are one of the core components of glass substrate manufacturing equipment. Controlling the uniformity of glass substrate thickness and the stability of the edge plates is a particularly important process technology. Taking a 0.7mm glass substrate as an example, its thickness fluctuation must be within approximately 20µm or 30µm, and the average edge plate thickness must be at least 1.5mm. The quality of the overflow brick structure design and the size of the process margin are key factors in the stability of the molding process. For glass substrate manufacturers, increasing the lead-out rate is one of the most obvious methods to improve output and production line efficiency. In terms of process, unstable overflow brick inlet flow rate and its distribution are more likely to cause overall flow instability within the overflow channel, leading to irregularities in the overall flow distribution of the glass strip. In terms of product, any fluctuation in the production line can cause pull fluctuations, resulting in production instability and a decrease in yield. Molding process adjustments, such as flow rate and temperature, are made based on the overflow brick's near and far-end edge plate flow rate and balance control, as well as the initial overall thickness distribution, to avoid instantaneous changes in the glass lead-out mass distribution and heat distribution. This ensures the production of glass substrates with strict requirements for stress, warpage, thickness, and sheet bending characteristics, and stable performance, using the overflow pull-out method. Controlling the thickness and consistency of the glass substrate is a crucial design and manufacturing technology. Because the glass substrate is very thin, any process fluctuations during production, including airflow and thermal fluctuations, can affect the thickness of the formed glass substrate, negatively impacting the quality of the display. Therefore, overflow brick design must consider the influence of these complex factors on the thickness distribution of the glass substrate, essentially increasing production margins in the design. Ensuring that the lead-out volume is increased while the product performance of the glass substrate meets customer requirements is one of the core technologies in overflow brick design and forming quality evaluation. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a method for evaluating the molding quality of glass substrates, which effectively solves the process problems of on-site molding lead plates after the lead-out amount is increased, thereby optimizing the molding thickness distribution of glass substrates, effectively increasing the edge plate margin, and ensuring the molding quality of glass substrates.

[0005] This invention is achieved through the following technical solution: a method for evaluating the molding quality of glass substrates, which is implemented through the following steps:

[0006] S1: Output amount through the manufacturing of overflow bricks used to manufacture glass substrates Viscosity during manufacturing and molding of glass substrates And the structural values ​​of the overflow bricks in the production line, to calculate the flow rate of the non-shrinkage edge plate of the manufactured glass substrate. ;

[0007] S2: Flow rate of the glass substrate without shrinkage edge plate obtained from S1 Flow rate of the lead plate and side plate Perform calculations;

[0008] S3: Flow rate of the glass substrate without shrinkage edge plate obtained from S1 and S2. and the flow rate of the lead plate and side plate Calculations were performed to obtain the glass substrate molding quality parameters: thickness distribution. Extremely poor thickness and average edge plate thickness The molding quality of the glass substrate is evaluated based on the molding quality parameters.

[0009] Furthermore, in S1, the flow rate of the non-shrinkage side plate... The calculation yields a differential flow distribution. Overflow height distribution and flow distribution .

[0010] Furthermore, in the calculations performed in S1, the structural values ​​of the overflow brick include the overflow weir inclination angle of the overflow brick. Overflow brick channel width Overflow brick channel width and overflow brick non-flowing differential spacing .

[0011] Furthermore, the flow distribution in the glass substrate during S1 This includes the near-end edge plate of the glass substrate with no shrinkage flow. No shrinkage flow at the far end of the glass substrate .

[0012] Furthermore, S1 includes:

[0013] S101: Based on the density of the glass overflow weir inclination angle of overflow bricks Overflow brick channel width Overflow brick channel width Overflow brick non-flowing differential spacing The differential flow distribution is obtained through calculation. Overflow height distribution and flow distribution ;

[0014] S102: Based on flow distribution Flow rate of glass substrate without shrinkage edge plate Perform calculations; S1, calculate the flow rate of the glass substrate without shrinkage edge plate. .

[0015] Furthermore, the formula applied in S2 is:

[0016] (6)

[0017] In the formula: The manufacturing output of this overflow brick is expressed in kg / hr: The critical contraction width of the overflow brick guide plate is in mm. The width of the glass substrate is in mm. The width of the glass substrate lead-in plate is in mm. The flow rate of the glass substrate without shrinkage is expressed in kg / hr.

[0018] Furthermore, based on the evaluation results obtained in S3, the manufacturing lead-out amount of the glass substrate at that moment is determined. Viscosity during manufacturing and molding of glass substrates Optimize.

[0019] Furthermore, S3 includes: S301 based on the flow rate of the non-shrinkage side plate. Flow rate of the guide plate and side plate Glass substrate manufacturing lead-out volume , overflow brick diversion plate critical contraction width Glass substrate specifications and dimensions (width) ; Glass substrate lead width Glass substrate lead plate thickness Edge pulling factor of glass substrate Overflow brick overflow surface width Average edge thickness of glass substrate Perform calculations;

[0020] ; Based on the coefficients related to the edge-pulling system Overflow brick overflow surface width Glass substrate specifications and dimensions (width) Calculated;

[0021] S302: Width according to glass substrate specifications Glass substrate lead width Density of glass Average edge thickness of glass substrate Flow rate of the guide plate and side plate The speed of the glass substrate lead plate was calculated. ;

[0022] S303: Based on the flow rate of the non-shrinkage side plate Flow rate of the guide plate and side plate Differential flow distribution Calculations were performed to obtain the thickness distribution of the glass substrate during molding. ;

[0023] S304: According to The effective area of ​​the glass substrate ( Maximum thickness within ) The effective area of ​​the glass substrate ( The minimum thickness within ) yields the thickness range The effective area refers to the dimensions of the glass substrate. Corresponding area.

[0024] Furthermore, in S3, the average edge plate thickness Glass substrate molding thickness distribution and thickness difference Calculate using the following formula:

[0025] (1) Average edge thickness of glass substrate

[0026] (7)

[0027] (8)

[0028] In the formula: The critical contraction width of the overflow brick guide plate is in mm. The width of the glass substrate is in mm. The width of the glass substrate lead-in plate is in mm. The thickness of the glass substrate lead-in plate is in mm. The overflow surface width of the overflow brick is in mm. The coefficients are related to the edge-pulling system;

[0029] (2) Glass substrate lead speed

[0030] (9)

[0031] In the formula: This is the density of glass, in units of... ; The width of the glass substrate is in mm. The width of the glass substrate lead-in plate is in mm.

[0032] (3) Thickness distribution of glass substrate

[0033] (10)

[0034] (4) Extremely poor thickness of glass substrate during molding

[0035] (11)

[0036] In the formula: The effective area of ​​the glass substrate ( The maximum thickness within ) is expressed in units of ; The effective area of ​​the glass substrate ( Minimum thickness within ) in units of ;

[0037] Preferably, the critical contraction width of the overflow brick diversion plate Calculate as follows:

[0038] (12)

[0039] In the formula: The width of the glass substrate is in mm. The width of the glass substrate lead-in plate is in mm. The overflow surface width of the overflow brick is in mm. The side plate flow reduction ratio introduced in the design of overflow brick structures is relevant to the design of fixed overflow systems. It is a constant value.

[0040] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a method for evaluating the molding quality of glass substrates, which is based on the actual amount of glass substrates produced. , Glass substrate manufacturing molding viscosity First, the differential flow distribution of the overflow brick is calculated. Overflow height distribution and flow distribution Then, the flow rate of the glass substrate without shrinkage edge plate is calculated. ; Introducing overflow bricks and diversion plates with critical contraction width Glass substrate specifications and dimensions (width) and glass substrate lead width Calculate the flow rate of the lead-in side plate of the glass substrate using parameters such as... The process parameters are also used to calculate the average edge plate thickness. Glass substrate molding thickness distribution and thickness difference Evaluate whether the thickness range and edge plate quality meet production requirements; if not, adjust the actual glass substrate manufacturing lead-out amount. , Glass substrate manufacturing molding viscosity The parameters were optimized to meet the requirements; the process problems of on-site forming of lead plates after the lead-out amount was increased were effectively solved, thereby optimizing the forming thickness distribution of glass substrate manufacturing, effectively increasing the edge plate margin, and ensuring the forming quality of glass substrate.

[0041] Furthermore, this invention improves the design of overflow bricks by optimizing the evaluation results based on the overflow brick structure design values, extraction amount, and viscosity, thereby further enhancing the molding quality. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0043] Figure 1 This is a schematic diagram of the overflow system structure;

[0044] Figure 2 This is a schematic diagram of the overflow pull-down structure;

[0045] Figure 3 This is a schematic diagram of the differential flow distribution;

[0046] Figure 4 This is a schematic diagram illustrating the relationship between differential flow rate and viscosity.

[0047] Figure 5 This is a schematic diagram showing the relationship between the differential flow rate and the output flow rate.

[0048] In the diagram: 1. Overflow brick; 2. Overflow trough; 3. Glass liquid supply device; 4. Root of overflow brick; 5. Formed glass substrate; 6. Downward pull direction of glass substrate; 7. Side plate range. Detailed Implementation

[0049] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0052] Example 1:

[0053] Step 1: Input the manufacturing lead-out amount of the glass substrate for the overflow brick. Viscosity during manufacturing and molding of glass substrates Based on the structural values ​​of the overflow brick in the production line, the flow rate of the glass substrate without shrinkage at the edge was obtained. .

[0054] Specifically, firstly, through the density of the glass overflow weir inclination angle of overflow bricks Overflow brick channel width Overflow brick channel width Overflow brick non-flowing differential spacing The differential flow distribution is obtained through calculation. Overflow height distribution and flow distribution Then, based on the traffic distribution Flow rate of glass substrate without shrinkage edge plate Perform calculations;

[0055] Step 2: Based on the flow rate of the glass substrate without shrinkage obtained in Step 1... Calculate the flow rate of the lead plate and side plate. ;

[0056] Specifically, based on step 1, the flow rate of the non-shrinkage side plate is obtained from Russia. Glass substrate manufacturing lead-out volume , overflow brick diversion plate critical contraction width Glass substrate specifications and dimensions (width) Glass substrate lead width The flow rate of the lead plate and side plate of the glass substrate is calculated. ;

[0057] Step 3: Based on the results of Step 1 and Step 2, determine the thickness distribution of the glass substrate. Extremely poor thickness and average edge plate thickness Perform calculations and evaluate the thickness range and edge plate quality based on the calculation results;

[0058] Based on the flow rate of the glass substrate without shrinkage edge obtained in steps 1 and 2 and the flow rate of the lead plate and side plate The calculation is performed, and the molding quality of the glass substrate is evaluated based on the calculation results;

[0059] Step 4: Based on the evaluation results obtained in Step 3, determine the manufacturing lead-out amount of the glass substrate at this moment. Viscosity during manufacturing and molding of glass substrates Adjustments were made to optimize the process.

[0060] Furthermore, based on the flow rate of the non-shrinkage side plate Flow rate of the guide plate and side plate Glass substrate manufacturing lead-out volume , overflow brick diversion plate critical contraction width Glass substrate specifications and dimensions (width) ; Glass substrate lead width Glass substrate lead plate thickness Overflow brick overflow surface width Average edge thickness of glass substrate Perform calculations; ; Based on the coefficients related to the edge-pulling system Overflow brick overflow surface width Glass substrate specifications and dimensions (width) Calculated;

[0061] According to the specifications and dimensions of the glass substrate, the width Glass substrate lead width Density of glass Average edge thickness of glass substrate Flow rate of the guide plate and side plate The speed of the glass substrate lead plate was calculated. ;

[0062] Based on the flow rate of the non-shrink side plate Flow rate of the guide plate and side plate Differential flow distribution Calculations were performed to obtain the thickness distribution of the glass substrate during molding. ;

[0063] according to The effective area of ​​the glass substrate ( Maximum thickness within ) The effective area of ​​the glass substrate ( The minimum thickness within ) yields the thickness range ;

[0064] Example 2:

[0065] A method for evaluating the molding quality of glass substrates includes the following steps:

[0066] Step 1, flow rate of the non-shrinkage edge plate of the glass substrate Perform the calculation as follows:

[0067] (1) Solve the following system of equations simultaneously to obtain the differential flow distribution. Overflow height distribution and flow distribution

[0068] (1)

[0069] (2)

[0070] (3)

[0071] (4)

[0072] In the formula: The number of leads produced for glass substrates, expressed in kg / hr. This is the density of glass, in units of... ; This is the acceleration due to gravity, in units of 1. ; The molding viscosity for glass substrates, in units of ; The overflow weir inclination angle of the overflow bricks, in units of ; The width of the overflow brick channel is in mm; The overflow brick groove depth is in mm; The non-flowing differential spacing of the overflow brick is in mm.

[0073] (2) Based on flow distribution Solving for the flow rate of the glass substrate without shrinkage at the edge.

[0074] (5)

[0075] In the formula: The flow rate of the glass substrate near the edge plate without shrinkage is expressed in kg / hr. The flow rate of the glass substrate's far-end edge plate without shrinkage is expressed in kg / hr; the far-end and near-end edge plates refer to the remaining portion after removing the effective area of ​​the glass substrate.

[0076] Step 2, flow rate of the lead-in edge plate of the glass substrate. Perform the calculations as follows:

[0077] (6)

[0078] In the formula: The critical contraction width of the overflow brick guide plate is in mm. The width of the glass substrate is in mm. The width of the glass substrate lead-in plate is in mm.

[0079] Step 3, calculate the average edge plate thickness. Glass substrate molding thickness distribution and thickness difference Calculate as follows:

[0080] (1) Average edge thickness of glass substrate

[0081] (7)

[0082] (8)

[0083] In the formula: The critical contraction width of the overflow brick guide plate is in mm. The width of the glass substrate is in mm. The width of the glass substrate lead-in plate is in mm. The thickness of the glass substrate lead-in plate is in mm. The overflow surface width of the overflow brick is in mm. The coefficients are related to the edge-pulling system.

[0084] (2) Glass substrate lead speed

[0085] (9)

[0086] In the formula: This is the density of glass, in units of... ; The width of the glass substrate is in mm. The width of the glass substrate lead-in plate is in mm.

[0087] (3) Thickness distribution of glass substrate

[0088] (10)

[0089] (4) Extremely poor thickness of glass substrate during molding

[0090] (11)

[0091] In the formula: The effective area of ​​the glass substrate ( The maximum thickness within ) is expressed in units of ; The effective area of ​​the glass substrate ( Minimum thickness within ) in units of .

[0092] Preferably, the critical contraction width of the overflow brick diversion plate Calculate as follows:

[0093] (12)

[0094] In the formula: The width of the glass substrate is in mm. The width of the glass substrate lead-in plate is in mm. The overflow surface width of the overflow brick is in mm. The side plate flow reduction ratio introduced in the design of overflow brick structures is relevant to the design of fixed overflow systems. It is a constant value.

[0095] In step 3, the average edge plate thickness is calculated as described above. Glass substrate molding thickness distribution and thickness difference This is used to evaluate whether the thickness variation and edge plate quality meet production requirements. Evaluation criteria are established based on the production line; if the criteria are not met, the actual glass substrate manufacturing output is adjusted. , Glass substrate manufacturing molding viscosity Set the parameters and repeat the above steps.

[0096] In the specific device, the overflow system is composed of an overflow brick 1 and a glass melt supply device 3 connected together. An overflow groove 2 is opened in the overflow brick 1, and the bottom of the overflow brick 1 is the root of the overflow brick 1. When the glass substrate is manufactured by molten overflow, in the forming process, the glass melt melted by the glass melting furnace is supplied to the glass melt supply device 3 in the molten overflow forming device, and overflows along the overflow groove 2 through both sides of the overflow brick 1, forming the glass substrate from below the root 4 of the overflow brick.

[0097] See Figure 2 The lead plate serves as the forming base for the glass substrate. During the glass substrate pulling and forming process, the formed glass substrate 5 moves downward along the glass substrate pulling direction 6. Among these, The width of the glass substrate. For the width of the lead plate, The effective width of the overflow brick. This is the critical contraction width of the drainage plate. The cutting width for the glass substrate. This represents the initial average sideplate flow rate. , where is the average flow rate of the lead plate and is the range of the lead plate; during the downward forming process, the molten glass gradually forms the glass substrate along the glass lead plate; in the width direction, from the center to both ends of the glass substrate, the thickness of the glass substrate in the middle is thin and uniform, and the thickness of the glass substrate increases from the middle to the two sides. The target glass substrate width is typically determined by taking the middle section with uniform thickness; the lead plate width is then determined. Remove glass substrate width This refers to the thickness of the side plate that needs to be removed. This invention controls the width by controlling the thickness of the side plate. The uniformity and consistency of the glass substrate thickness within the specified range.

[0098] like Figure 3 The diagram shown is a schematic representation of the differential flow rate relationship in this embodiment. Since the flow rate is nonlinear, the differential flow rate can be obtained based on the analysis of formulas (1) to (4). Changes; according to formula (10), the thickness distribution of the glass substrate during molding. Basically with differential flow They are directly proportional. This can be achieved by adjusting the actual lead-out amount during glass substrate manufacturing. , Glass substrate manufacturing molding viscosity Parameters such as these can change the differential flow rate. Thickness distribution and average edge plate thickness .

[0099] like Figure 4 As shown, this is the differential flow rate in this embodiment. Viscosity in the manufacturing and molding of glass substrates Schematic diagram of the variation relationship. This can be based on the manufacturing viscosity of the glass substrate. Adjustment, traffic distribution The changes mainly occurred in the near-end region of the overflow brick, while the changes were relatively weaker in the far-end region.

[0100] like Figure 5 The diagram shown illustrates the relationship between the differential flow rate and the outflow rate in this embodiment. Adjustments to the outflow rate primarily alter the flow distribution in the near-end region of the overflow brick, while the change is relatively weaker in the far-end region.

[0101] For a glass substrate with an actual thickness of 0.5 mm, the average edge plate thickness requirement is T_E ≥ 1.5 mm, and the thickness range requirement is ∆ ≤ 12 μm; for a glass substrate with an actual thickness of 0.7 mm, the average edge plate thickness requirement is T_E ≥ 2.0 mm, and the thickness range requirement is ∆ ≤ 15 μm. When the actual obtained average edge plate thickness and thickness range do not meet the requirements, the overflow brick parameters are improved to further ensure the molding quality of the glass substrate.

[0102] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0103] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for evaluating the molding quality of a glass substrate, characterized in that, This evaluation method is implemented through the following steps: S1: Output amount through the manufacturing of overflow bricks used to manufacture glass substrates Viscosity during manufacturing and molding of glass substrates In addition to the structural values ​​of the overflow brick, the flow rate of the manufactured glass substrate without shrinkage edge plate is calculated. ; S2: Flow rate of the glass substrate without shrinkage edge plate obtained from S1 Flow rate of the lead plate and side plate Perform calculations; S3: Flow rate of the glass substrate without shrinkage edge plate obtained from S1 and S2. and the flow rate of the lead plate and side plate Calculations were performed to obtain the glass substrate molding quality parameters: thickness distribution. Extremely poor thickness and average edge plate thickness ; The molding quality of the glass substrate is evaluated based on molding quality parameters; No shrinkage side plate flow The following formula (5) represents: （5） In the formula: The flow rate of the glass substrate near the edge plate without shrinkage is expressed in kg / hr. The flow rate of the glass substrate's far-end edge plate without shrinkage is expressed in kg / hr; the far-end and near-end edge plates refer to the remaining portion after removing the effective area of ​​the glass substrate. Flow rate of the lead plate and side plate The following formula (6) represents: （6） In the formula: The manufacturing output of this overflow brick is expressed in kg / hr: The critical contraction width of the overflow brick guide plate is in mm. The width of the glass substrate is in mm. The width of the glass substrate lead-in plate is in mm. The flow rate of the glass substrate without shrinkage is expressed in kg / hr. In S3, the average edge plate thickness Glass substrate molding thickness distribution and thickness difference Calculate using the following formula: (1) Average edge thickness of glass substrate （7） （8） In the formula: The critical contraction width of the overflow brick guide plate is in mm. The width of the glass substrate is in mm. The width of the glass substrate lead-in plate is in mm. The thickness of the glass substrate lead-in plate is in mm. The overflow surface width of the overflow brick is in mm; The coefficients are related to the edge-pulling system; (2) Glass substrate lead speed （9） In the formula: This is the density of glass, in units of... ; The width of the glass substrate is in mm. The width of the glass substrate lead-in plate is in mm. (3) Thickness distribution of glass substrate （10） (4) Extremely poor thickness of glass substrate during molding （11） In the formula: Effective area of ​​glass substrate Maximum thickness inside, in units of ; Effective area of ​​glass substrate Minimum thickness within, in units of ; overflow brick diversion plate critical contraction width Calculate as follows: （12） In the formula: The width of the glass substrate is in mm. The width of the glass substrate lead-in plate is in mm. The overflow surface width of the overflow brick is in mm; The side plate flow reduction ratio introduced in the design of overflow brick structures is relevant to the design of fixed overflow systems. It is a constant value.

2. The method for evaluating the molding quality of a glass substrate according to claim 1, characterized in that, In S1, the flow rate of the non-shrinking side plate is... The calculation yields a differential flow distribution. Overflow height distribution and flow distribution .

3. The method for evaluating the molding quality of a glass substrate according to claim 1, characterized in that, When performing calculations in S1, the structural values ​​of the overflow brick include the overflow weir inclination angle of the overflow brick. Overflow brick channel width Overflow brick groove depth and overflow brick non-flowing differential spacing .

4. The method for evaluating the molding quality of a glass substrate according to claim 1, characterized in that, The flow distribution in the glass substrate in S1 This includes the near-end edge plate of the glass substrate with no shrinkage flow. No shrinkage flow at the far end of the glass substrate .

5. The method for evaluating the molding quality of a glass substrate according to claim 1, characterized in that, S1 includes: S101: Based on the density of the glass overflow weir inclination angle of overflow bricks Overflow brick channel width Overflow brick groove depth Overflow brick non-flowing differential spacing The differential flow distribution is obtained through calculation. Overflow height distribution and flow distribution ; S102: Based on flow distribution Flow rate of glass substrate without shrinkage edge plate Perform the calculation.

6. The method for evaluating the molding quality of a glass substrate according to claim 1, characterized in that, Based on the evaluation results obtained from S3, the manufacturing yield of overflow bricks for glass substrates was determined. Viscosity during manufacturing and molding of glass substrates Optimize.

7. The method for evaluating the molding quality of a glass substrate according to claim 1, characterized in that, S3 includes: S301 based on the flow rate of the non-shrink side plate. Flow rate of the guide plate and side plate The manufacturing output of overflow bricks for glass substrates , overflow brick diversion plate critical contraction width Glass substrate specifications and dimensions (width) ; Glass substrate lead width Glass substrate lead plate thickness Edge pulling factor of glass substrate Overflow brick overflow surface width Average edge thickness of glass substrate Perform calculations; ; Based on the coefficients related to the edge-pulling system Overflow brick overflow surface width Glass substrate specifications and dimensions (width) Calculated; S302: Width according to glass substrate specifications Glass substrate lead width Density of glass Average edge thickness of glass substrate Flow rate of the guide plate and side plate The speed of the glass substrate lead plate was calculated. ; S303: Based on the flow rate of the non-shrinkage side plate Flow rate of the guide plate and side plate Differential flow distribution Calculations were performed to obtain the thickness distribution of the glass substrate during molding. ; S304: According to The maximum thickness within the effective area of ​​the glass substrate and The thickness range is obtained by finding the minimum thickness within the effective area of ​​the glass substrate. The effective area refers to the dimensions of the glass substrate. Corresponding area.

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