Edge plate control method and system for improving overflow brick withdrawal amount

Abstract

The present invention discloses an edge plate control method and system for improving the amount of overflow brick drawn out, which belongs to the field of glass substrate manufacturing. Based on TIFF2025501825000279.tif66, actual overflow coefficient TIFF2025501825000280.tif65 and average edge width Combined with TIFF2025501825000281.tif66, the stretch width of the glass substrate TIFF2025501825000282.tif66 and actual overflow area width Calculate the average edge thickness of the glass substrate when manufacturing it. TIFF2025501825000284.tif67 is calculated and the final average edge plate thickness is calculated. TIFF2025501825000285.tif67 to meet the design needs. The parameters in this process are the actual critical shrinkage width of the guide plate to meet the process requirements of stable stretching in the glass substrate production line production TIFF2025501825000286.tif65, stretching speed V, average edge plate flow rate TIFF2025501825000287.tif65, average edge plate mass TIFF2025501825000288.tif66, Effective utilization rate of glass substrate TIFF2025501825000289.tif63 is used to calculate other parameters of the overflow brick.

Description

[Technical Field]

[0001] The present invention relates to the field of glass substrate manufacturing, and more particularly to an edge plate control method and system for improving the withdrawal amount of overflow bricks. [Background technology]

[0002] Glass substrates used in the manufacturing of flat panel displays, such as thin-film transistor displays (TFT-LCDs) and organic light-emitting diodes (OLEDs), are typically produced using the overflow downdraw method. The molten glass produced in a glass melting furnace is then fed into a melting overflow downdraw molding machine during the forming process. Display manufacturing demands larger glass substrates to improve production efficiency and reduce costs. Larger glass substrates are more difficult to produce and require more complex quality control. Overflow bricks are one of the core components of glass substrate manufacturing and molding equipment. From a technical perspective, instability in the flow rate and distribution at the overflow brick inlet can lead to instability in the flow throughout the overflow channel, resulting in irregular flow distribution throughout the glass ribbon. From a product perspective, any fluctuations in the production line can cause fluctuations in the drawing, potentially resulting in unstable production and a lower yield rate. For glass substrate manufacturers, increasing the drawing rate is one of the most obvious ways to increase production volume and production line efficiency.

[0003] However, improving the draw rate requires consideration of the overflow brick inlet groove width, balancing the flow rate of the edge plates at the far and near ends of the overflow brick, and ensuring uniformity of the overall thickness distribution. Controlling the thickness and consistency of glass substrates is a crucial design and process technology. Based on actual needs, overflow bricks must generally accommodate glass substrates with thicknesses between 0.2 and 0.7 mm, so the overflow brick design must also accommodate glass substrates with thicknesses of 0.2 to 0.7 mm. Because glass substrates are so thin, any variations in manufacturing processes, including airflow and thermal fields, can affect the thickness of the resulting glass substrate and negatively impact display quality. Therefore, overflow bricks must be designed to account for the impact of these complex factors on the thickness distribution of the glass substrate, thereby increasing the design's production margin. Ensuring improved draw rate while ensuring that the glass substrate's performance meets customer requirements is a core technology in overflow brick design.

[0004] As described above, the conventional method was unable to solve the problem that the thin edge plate causes variations in drawing when forming the glass substrate after increasing the drawing amount. Summary of the Invention [Problem to be solved by the invention]

[0005] To solve the above technical problems, the present invention provides an edge plate control method and system for improving the withdrawal amount of overflow bricks, which adjusts the drawing width and actual overflow coefficient of the glass substrate so that the edge plate thickness during the glass substrate forming process meets the needs, and solves the problem that if the drawing amount is increased, the edge plate thickness is too thin during the glass substrate forming process, causing undulations in the drawing. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention adopts the following technical solutions.

[0007] An edge plate control method for improving the extraction amount of overflow bricks, comprising: Taking the overflow coefficient of a standard overflow brick system as the actual overflow coefficient of the actual overflow brick system, determining the average edge plate width, the effective surface width of the glass substrate, and the thickness of the glass substrate according to the product specifications, calculating the stretching width from the average edge plate width and the effective surface width of the glass substrate, and calculating the actual overflow surface width in combination with the average edge plate width in step S1; Calculating the actual critical shrinkage width from the overflow surface width and the critical shrinkage width of the standard overflow brick system and the actual overflow surface width in step S2; Calculating the average edge plate flow rate before shrinkage from the extraction amount of the actual overflow brick system, the effective surface width of the glass substrate, and the actual overflow surface width, and calculating the average edge plate flow rate after shrinkage from the average edge plate flow rate before shrinkage in step S3; Calculating the down-draw factor of the glass substrate from the actual overflow surface width, the effective surface width of the glass substrate, and the thickness of the glass substrate in step S4; Calculating the average edge plate thickness from the thickness of the glass substrate, the average edge plate flow rate after shrinkage, the extraction amount of the actual overflow brick system, the stretching width, and the effective surface width of the glass substrate in step S5; If the average edge plate thickness in S5 ≧ K·the thickness of the glass substrate, outputting the current actual overflow coefficient and the corresponding actual overflow surface width; If the average edge plate thickness in S5 < K·the thickness of the glass substrate, adjusting the actual overflow coefficient until the average edge plate thickness ≧ K·the thickness of the glass substrate, and outputting the adjusted actual overflow coefficient and the corresponding adjusted actual overflow surface width in step S6, including: 2.5 ≦ K ≦ 3.5.

[0008] Furthermore, in S1, the stretching width The specific formula of TIFF0007734766000001.tif66 is TIFF0007734766000002.tif640, Actual overflow surface width The specific formula for TIFF0007734766000003.tif65 is: TIFF0007734766000004.tif69, where: TIFF0007734766000005.tif64 is the overflow coefficient for the standard overflow brick system, TIFF0007734766000006.tif66 is the average edge plate width, TIFF0007734766000007.tif66 is the effective surface width of the glass substrate.

[0009] Furthermore, in S2, the actual critical shrinkage width The specific formula for TIFF0007734766000008.tif65 is: TIFF0007734766000009.tif1221, where: TIFF0007734766000010.tif68 is the critical shrinkage width of a standard overflow brick system, TIFF0007734766000011.tif67 is the overflow face width of a standard overflow brick system.

[0010] Furthermore, in S3, the mean pre-contraction marginal flow rate The specific formula for TIFF0007734766000012.tif67 is: TIFF0007734766000013.tif628, Average edge plate flow rate after contraction The specific formula for TIFF0007734766000014.tif65 is: TIFF0007734766000015.tif1252, where: TIFF0007734766000016.tif64 is the actual drawer amount of the overflow brick system.

[0011] Furthermore, in S4, the downdraw factor of the glass substrate The specific formula for TIFF0007734766000017.tif64 is: TIFF0007734766000018.tif1250, where: TIFF0007734766000019.tif64 is the thickness of the glass substrate.

[0012] Furthermore, in S5, the average edge thickness The specific formula for TIFF0007734766000020.tif65 is: The file is TIFF0007734766000021.tif1236.

[0013] Furthermore, the effective surface width of the glass substrate Glass substrate cutting width from TIFF0007734766000022.tif66 TIFF0007734766000023.tif66 and cut height TIFF0007734766000024.tif65 and the density of the glass substrate TIFF0007734766000025.tif64, Post-contraction mean marginal plate flow rate TIFF0007734766000026.tif65, Average edge plate thickness TIFF0007734766000027.tif65, stretch width TIFF0007734766000028.tif66, Effective surface width of glass substrate TIFF0007734766000029.tif66, and the downdraw factor of the glass substrate Enlargement speed from TIFF0007734766000030.tif64 TIFF0007734766000031.tif65 is calculated, and the specific formula is: TIFF0007734766000032.tif625, Actual draw volume of the overflow brick system TIFF0007734766000033.tif64, Enlargement speed TIFF0007734766000034.tif65, Cut width TIFF0007734766000035.tif66, Cut height TIFF0007734766000036.tif65, Glass substrate thickness TIFF0007734766000037.tif64, Effective surface width of glass substrate TIFF0007734766000038.tif66, Density of glass substrate TIFF0007734766000039.tif64, Average edge plate thickness TIFF0007734766000040.tif65, and the downdraw factor of the glass substrate Average edge plate mass from TIFF0007734766000041.tif64 TIFF0007734766000042.tif66 is calculated, and the specific formula is: The file is TIFF0007734766000043.tif674.

[0014] Furthermore, the actual draw amount of the overflow brick system TIFF0007734766000044.tif64 and mean post-contraction marginal plate flow rate Effective utilization rate from TIFF0007734766000045.tif65 TIFF0007734766000046.tif63 is calculated, and the specific formula is: The file is TIFF0007734766000047.tif631.

[0015] The method further includes step S7 of adjusting the actual overflow coefficient so that 3 times the thickness of the glass substrate≦average edge plate thickness≦5 times the thickness of the glass substrate.

[0016] An edge plate control system for improving the amount of overflow bricks drawn out that realizes the steps of the edge plate control method for improving the amount of overflow bricks drawn out, Taking the overflow coefficient of a standard overflow lehr system as the actual overflow coefficient of the actual overflow lehr system, determining the average edge plate width, the effective surface width of the glass substrate, and the thickness of the glass substrate according to the product specifications, calculating the stretching width from the average edge plate width and the effective surface width of the glass substrate, and a selection module configured to calculate the actual overflow surface width in combination with the average edge plate width; An actual critical shrinkage width module configured to calculate the actual critical shrinkage width from the overflow surface width of the standard overflow lehr system, the critical shrinkage width, and the actual overflow surface width; A post-shrinkage average edge plate flow rate module configured to calculate the average edge plate flow rate before shrinkage from the withdrawal amount of the actual overflow lehr system, the effective surface width of the glass substrate, and the actual overflow surface width, and calculate the average edge plate flow rate after shrinkage from the average edge plate flow rate before shrinkage; A glass substrate drawdown factor module configured to obtain the drawdown factor of the glass substrate from the actual overflow surface width, the effective surface width of the glass substrate, and the thickness of the glass substrate; An average edge plate thickness module configured to calculate the average edge plate thickness from the thickness of the glass substrate, the average edge plate flow rate after shrinkage, the withdrawal amount of the actual overflow lehr system, the stretching width, and the effective surface width of the glass substrate; If the average edge plate thickness in S5 is ≧ K · the thickness of the glass substrate as a result of the judgment, output the current actual overflow coefficient and the corresponding actual overflow surface width; if the average edge plate thickness in S5 < K · the thickness of the glass substrate, adjust the actual overflow coefficient until the average edge plate thickness ≧ K · the thickness of the glass substrate, and a judgment output module configured to output the adjusted actual overflow coefficient and the adjusted corresponding actual overflow surface width, where 2.5 ≦ K ≦ 3.5.

Advantages of the Invention

[0017] Compared with the prior art, the present invention has the following beneficial effects.

[0018] The present invention provides an edge plate control method for improving the amount of overflow brick extraction, and the method is performed when the target glass substrate width is Based on TIFF0007734766000048.tif66, actual overflow coefficient TIFF0007734766000049.tif65 and average edge width Combined with TIFF0007734766000050.tif66, the stretched width of the glass substrate TIFF0007734766000051.tif66 and actual overflow surface width Calculate the average edge thickness of the glass substrate (TIFF0007734766000052.tif65). TIFF0007734766000053.tif67 is calculated and the final average edge thickness is calculated. TIFF0007734766000054.tif67 to meet the design needs. The parameters in this process are the actual critical shrinkage width of the guide plate to meet the process requirements of stable stretching in the glass substrate production line. TIFF0007734766000055.tif65, stretching speed V, average edge plate flow rate TIFF0007734766000056.tif65, average edge plate mass TIFF0007734766000057.tif66, Effective utilization rate of glass substrate TIFF0007734766000058.tif63 is used to calculate other parameters of the overflow brick. The present invention can effectively solve the problem of wave motion in on-site forming and stretching when the drawing amount is increased, optimize the forming thickness distribution in the production of glass substrates, increase the design production margin, and ensure the consistency of the edge thickness of the glass substrates.

[0019] Furthermore, by further adjusting the actual overflow coefficient so that the average edge thickness is 3 times the thickness of the glass substrate≦average edge thickness≦5 times the thickness of the glass substrate, the average edge thickness is within a reasonable range, and the larger the average edge thickness, the more stable the edge control and the more stable the stretching.

[0020] The present invention also provides an edge plate control system for improving the drawing amount of overflow bricks, which realizes the steps of the above design method, and the method of the system satisfies the needs of the edge plate thickness during the glass substrate forming process, thereby solving the problem that the edge plate thickness is too thin during the glass substrate forming process, causing wavy drawing when the drawing amount is improved. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a structural schematic diagram of an overflow system according to an embodiment of the present invention; [Figure 2] 1 is a schematic diagram of an overflow downdraw structure according to an embodiment of the present invention. [Figure 3] FIG. 10 is a schematic diagram of the relationship between edge plate flow contraction ratio and overflow coefficient according to an embodiment of the present invention. [Figure 4] FIG. 10 is a schematic diagram of edge plate flow contraction ratio versus average edge plate thickness according to another embodiment of the present invention. [Figure 5] FIG. 10 is a schematic diagram of the relationship between the stretch width, the stretch factor, the overflow factor and the edge plate flow contraction ratio according to another embodiment of the present invention. [Figure 6] 4 is a flow chart of an edge plate control method for improving the amount of overflow brick withdrawal according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention provides an edge plate control method for improving the amount of overflow bricks drawn out, including the following steps S1 to S6, as shown in FIG.

[0023] The edge plate control method for improving the amount of overflow bricks drawn out includes the following steps S1 to S6.

[0024] S1: The overflow coefficient of the standard overflow brick system is taken as the actual overflow coefficient of the actual overflow brick system. The average edge width, the effective surface width of the glass substrate, and the thickness of the glass substrate are determined according to the product specifications. The stretched width is calculated from the average edge width and the effective surface width of the glass substrate, and the actual overflow surface width is calculated by combining the average edge width with the actual overflow brick system. Stretch width The specific formula for TIFF0007734766000059.tif66 is: TIFF0007734766000060.tif640, Actual overflow surface width The specific formula for TIFF0007734766000061.tif65 is: TIFF0007734766000062.tif69 where, TIFF0007734766000063.tif64 is the overflow coefficient for the standard overflow brick system, TIFF0007734766000064.tif66 is the average edge plate width, TIFF0007734766000065.tif66 is the effective surface width of the glass substrate.

[0025] S2: Calculate the actual critical shrinkage width from the overflow face width and critical shrinkage width of a standard overflow brick system and the actual overflow face width. Actual critical shrinkage width The specific formula for TIFF0007734766000066.tif65 is: TIFF0007734766000067.tif1221, where: TIFF0007734766000068.tif68 is the critical shrinkage width of a standard overflow brick system, TIFF0007734766000069.tif67 is the overflow face width of a standard overflow brick system.

[0026] S3: Calculate the average edge plate flow rate before shrinkage from the actual withdrawal amount of the overflow brick system, the effective surface width of the glass substrate, and the actual overflow surface width, and calculate the average edge plate flow rate after shrinkage from the average edge plate flow rate before shrinkage; At S3, the mean pre-contraction marginal flow rate The specific formula for TIFF0007734766000070.tif67 is: TIFF0007734766000071.tif628, Average edge plate flow rate after contraction The specific formula for TIFF0007734766000072.tif65 is: TIFF0007734766000073.tif1252, where: TIFF0007734766000074.tif64 is the actual drawer volume of the overflow brick system.

[0027] S4: The downdraw factor of the glass substrate is calculated from the actual overflow surface width, the effective surface width of the glass substrate, and the thickness of the glass substrate. Glass substrate downdraw factor The specific formula for TIFF0007734766000075.tif64 is: TIFF0007734766000076.tif1250, where: TIFF0007734766000077.tif64 is the thickness of the glass substrate.

[0028] S5: Calculate the average edge thickness from the thickness of the glass substrate, the average edge flow rate after shrinkage, the actual withdrawal amount of the overflow brick system, the extension width, and the effective surface width of the glass substrate; Average edge thickness The specific formula for TIFF0007734766000078.tif65 is: It is TIFF0007734766000079.tif1236.

[0029] If the average edge plate thickness in S6:S5 ≥ K · the thickness of the glass substrate, output the current actual overflow coefficient and the corresponding actual overflow surface width. If the average edge plate thickness in S5 < K · the thickness of the glass substrate, adjust the actual overflow coefficient until the average edge plate thickness ≥ K · the thickness of the glass substrate, and output the adjusted actual overflow coefficient and the adjusted corresponding actual overflow surface width. Here, 2.5 ≤ K ≤ 3.5.

[0030] On the other hand, the effective surface width of the glass substrate From TIFF0007734766000080.tif66 to the cut width of the glass substrate TIFF0007734766000081.tif66 and the cut height Obtain TIFF0007734766000082.tif65, and get the density of the glass substrate TIFF0007734766000083.tif64, the average edge plate flow rate after shrinkage TIFF0007734766000084.tif65, the average edge plate thickness TIFF0007734766000085.tif65, the stretching width TIFF0007734766000086.tif66, the effective surface width of the glass substrate TIFF0007734766000087.tif66, and the drawdown factor of the glass substrate The stretching speed can be calculated from TIFF0007734766000088.tif64 TIFF0007734766000089.tif65, and the specific formula is TIFF0007734766000090.tif625, and The withdrawal amount of the actual overflow brick system TIFF0007734766000091.tif64, the stretching speed TIFF0007734766000092.tif65, Cut width TIFF0007734766000093.tif66, Cut height TIFF0007734766000094.tif65, Glass substrate thickness TIFF0007734766000095.tif64, Effective surface width of glass substrate TIFF0007734766000096.tif66, Density of glass substrate TIFF0007734766000097.tif64, Average edge plate thickness TIFF0007734766000098.tif65, and the downdraw factor of the glass substrate Average edge plate mass from TIFF0007734766000099.tif64 Calculate TIFF0007734766000100.tif66, the specific formula is: The file is TIFF0007734766000101.tif674.

[0031] On the other hand, the actual withdrawal amount of the overflow brick system TIFF0007734766000102.tif64 and mean post-contraction marginal plate flow rate Effective utilization rate from TIFF0007734766000103.tif65 TIFF0007734766000104.tif63 is calculated, and the specific formula is: The file is TIFF0007734766000105.tif631.

[0032] In order to make the edge plate control more stable and the stretching more stable, the method further includes step S7. S7: Further adjust the actual overflow coefficient so that 3 times the thickness of the glass substrate≦average edge plate thickness≦5 times the thickness of the glass substrate.

[0033] The present invention also provides an edge plate control system for improving the drawing amount of overflow bricks, which includes a selection module, a practical critical shrinkage width module, an average edge plate flow rate module after shrinkage, a glass substrate drawdown factor module, an average edge plate thickness module, and a judgment output module. The selection module determines the average edge plate width, the effective surface width of the glass substrate, and the thickness of the glass substrate according to the product specifications, taking the overflow coefficient of a standard overflow brick system as the actual overflow coefficient of the actual overflow brick system, calculates the extension width from the average edge plate width and the effective surface width of the glass substrate, and is configured to calculate the actual overflow surface width in combination with the average edge plate width. The practical critical shrinkage width module is configured to calculate the practical critical shrinkage width from the overflow surface width and the critical shrinkage width of a standard overflow brick system, and the actual overflow surface width. The average edge plate flow rate module after shrinkage is configured to calculate the average edge plate flow rate before shrinkage from the drawing amount of the actual overflow brick system, the effective surface width of the glass substrate, and the actual overflow surface width, and calculate the average edge plate flow rate after shrinkage from the average edge plate flow rate before shrinkage. The glass substrate drawdown factor module is configured to obtain the drawdown factor of the glass substrate from the actual overflow surface width, the effective surface width of the glass substrate, and the thickness of the glass substrate. The average edge plate thickness module is configured to calculate the average edge plate thickness from the thickness of the glass substrate, the average edge plate flow rate after shrinkage, the drawing amount of the actual overflow brick system, the extension width, and the effective surface width of the glass substrate. The judgment output module is configured to output the current actual overflow coefficient and the corresponding actual overflow surface width if the average edge plate thickness in S5 is ≧ K·the thickness of the glass substrate as a result of the judgment, and adjust the actual overflow coefficient until the average edge plate thickness in S5 is ≧ K·the thickness of the glass substrate if the average edge plate thickness in S5 is < K·the thickness of the glass substrate, and output the adjusted actual overflow coefficient and the adjusted corresponding actual overflow surface width, where 2.5 ≦ K ≦ 3. Weigh. Example

[0034] As shown in Figure 1, the overflow system connects overflow brick 1 and glass melt supply device 3, with overflow groove 2 formed in overflow brick 1 and the bottom of overflow brick 1 being the base of overflow brick 1. When manufacturing glass substrates by melt overflow, molten glass melted in a glass melting furnace in the forming process is supplied to glass melt supply device 3 of the melt overflow forming device, and is made to overflow from both sides of overflow brick 1 along overflow groove 2, forming a glass substrate below base 4 of overflow brick 1.

[0035] As shown in Figure 2, drawing is the basis for forming a glass substrate, and in down-draw forming of a glass substrate, a forming glass substrate 5 is moved downward along the down-draw direction 6 of the glass substrate. TIFF0007734766000106.tif66 is the glass substrate width, TIFF0007734766000107.tif66 is the stretch width, TIFF0007734766000108.tif65 is the effective width of the overflow brick, TIFF0007734766000109.tif65 is the critical shrinkage width of the guide plate (i.e., the actual critical shrinkage width), TIFF0007734766000110.tif66 is the glass substrate cutting width, TIFF0007734766000111.tif67 is the initial mean marginal flow rate (i.e., the mean marginal flow rate before contraction), TIFF0007734766000112.tif65 is the average edge plate flow rate after shrinkage, and is the range of the edge plate. In the down-draw molding of glass substrates, the glass melt is stretched into glass to form the glass substrate. In the width direction, from the center of the glass substrate to both sides of the glass substrate, the thickness of the central glass substrate is thin and uniform, and the thickness of the formed glass substrate increases from the center to both sides. TIFF0007734766000113.tif66 is the target glass substrate width (i.e., the effective surface width of the glass substrate), and is generally the value of the central part where the thickness is uniform. Glass substrate width from TIFF0007734766000114.tif66 The thickness of the edge plate to be removed is obtained by subtracting TIFF0007734766000115.tif66. In this embodiment, the width is adjusted by controlling the thickness of the edge plate. TIFF0007734766000116.tif66 Ensure uniformity and consistency of glass substrate thickness within the range.

[0036] With reference to FIG. 2, this embodiment discloses an edge plate control method for improving the amount of overflow bricks drawn out, including the following steps 1 to 4.

[0037] Step 1: Standard overflow brick system as a reference and overflow coefficient of the reference overflow brick TIFF0007734766000117.tif65 is the design standard, that is, the actual overflow coefficient of the actual overflow brick system, and the average edge board width according to the designed product specifications. TIFF0007734766000118.tif66 and design enlargement width Determine TIFF0007734766000119.tif66. Stretch width TIFF0007734766000120.tif66 and glass substrate overflow coefficient TIFF0007734766000121.tif65 is calculated as follows: TIFF0007734766000122.tif640TIFF0007734766000123.tif69In the formula, TIFF0007734766000124.tif66 is the stretched width of the glass substrate (unit: mm), TIFF0007734766000125.tif66 is the effective surface width of the glass substrate (unit: mm), TIFF0007734766000126.tif65 is the overflow surface width of the overflow brick (actual overflow surface width) (unit: mm), TIFF0007734766000127.tif66 is the average edge width (unit: mm). From the above relationship, the overflow surface width of the overflow brick TIFF0007734766000128.tif65 can be determined.

[0038] Step 2: Critical shrinkage width of the guide plate Calculate TIFF0007734766000129.tif65. TIFF0007734766000130.tif1252In formula, TIFF0007734766000131.tif65 is a parameter specific to the overflow system and is related to the surface tension of the glass and the wetting and spreading effect of the guide plate (note: the guide plate is one of the important parts of the overflow brick system). TIFF0007734766000132.tif1212 is the edge plate flow contraction ratio, and once the structure of the overflow brick is determined, TIFF0007734766000133.tif64 and TIFF0007734766000134.tif66 (i.e., the height of the edge roller changes. Note: The edge roller is one of the important parts of the forming system), TIFF0007734766000135.tif65 will never change. TIFF0007734766000136.tif67 and TIFF0007734766000137.tif68 are the overflow surface width and critical shrinkage width of the standard overflow brick, respectively. TIFF0007734766000138.tif67 shows the mean pre-contraction marginal plate flow rate (unit TIFF0007734766000139.tif617) TIFF0007734766000140.tif65 shows the average post-contraction marginal plate flow rate (unit TIFF0007734766000141.tif617).

[0039] Step 3: Glass substrate downdraw factor Calculate TIFF0007734766000142.tif64. TIFF0007734766000143.tif1297In formula, TIFF0007734766000144.tif610 is the stretch factor, TIFF0007734766000145.tif64 is the thickness of the glass substrate (unit: mm).

[0040] Step 4: Glass substrate average edge thickness TIFF0007734766000146.tif65, average edge plate mass TIFF0007734766000147.tif66 and glass substrate effective utilization rate TIFF0007734766000148.tif63 is calculated, (1) Average edge thickness TIFF0007734766000149.tif65TIFF0007734766000150.tif1269(2) Average edge plate mass TIFF0007734766000151.tif66TIFF0007734766000152.tif1074In the formula, TIFF0007734766000153.tif64 is the glass substrate withdrawal amount (unit: kg / Hr), TIFF0007734766000154.tif65 is the enlargement speed (unit: mm / min), TIFF0007734766000155.tif64 is the density of the glass substrate (unit: kg / m 3 ), TIFF0007734766000156.tif66, TIFF0007734766000157.tif65 are the cut width and height (unit: mm) of the glass substrate, respectively.

[0041] (3) Effective utilization rate TIFF0007734766000158.tif63TIFF0007734766000159.tif1031In formula, TIFF0007734766000160.tif65 is the average edge flow rate of the glass substrate (unit TIFF0007734766000161.tif617).

[0042] The design includes the actual overflow coefficient of the actual overflow brick system. TIFF0007734766000162.tif64 is equal to the overflow coefficient of the reference overflow brick.

[0043] Calculated average edge thickness For TIFF0007734766000163.tif614, use step 1 TIFF0007734766000164.tif64 TIFF0007734766000165.tif615, and then adjust the corresponding actual overflow coefficient TIFF0007734766000166.tif65 and actual overflow surface width TIFF0007734766000167.tif65 can effectively control the average edge plate thickness, Calculated average edge thickness In the case of TIFF0007734766000168.tif615, TIFF0007734766000169.tif64 is the average edge thickness TIFF0007734766000170.tif65 is the edge plate flow contraction ratio that can be controlled, and the overflow coefficient TIFF0007734766000171.tif65 and overflow surface width of overflow brick TIFF0007734766000172.tif65 is determined by step 1, Here, the value of K is in the range of 2.5 to 3.5. However, the value of K is determined according to the working conditions prior to manufacturing, so once production begins, the value of K is a fixed value between 2.5 and 3.5.

[0044] TIFF0007734766000173.tif64 may be further adjusted so that 3 times the thickness of the glass substrate≦average edge plate thickness≦5 times the thickness of the glass substrate, i.e. The larger TIFF0007734766000174.tif65, the more stable the edge control and the more stable the stretching.

[0045] In step 1, the glass substrate is stretched to a certain width. TIFF0007734766000175.tif617 and stretch factor The value range of TIFF0007734766000176.tif64 is 1.05≦α≦1.25.

[0046] In step 2, the edge plate flow rate contraction ratio The value range of TIFF0007734766000177.tif64 is 0.5≦ TIFF0007734766000178.tif64≦1.

[0047] In step 4, the average edge flow rate of the glass substrate TIFF0007734766000179.tif65 and enlargement speed TIFF0007734766000180.tif65 is calculated as follows: (1) Average edge flow rate of glass substrate TIFF0007734766000181.tif65TIFF0007734766000182.tif1029TIFF0007734766000183.tif1552(2) Enlargement speed TIFF0007734766000184.tif65TIFF0007734766000185.tif1025Edge plate flow rate contraction ratio in step 2 TIFF0007734766000186.tif64 is as follows. TIFF0007734766000187.tif1525

[0048] In this method, the standard size of the glass substrate in steps 1 to 4 is TIFF0007734766000188.tif66, Process Cut Size TIFF0007734766000189.tif627 and TIFF0007734766000190.tif65, Average edge width TIFF0007734766000191.tif66, Designed drawer volume TIFF0007734766000192.tif64, Overflow Factor By combining parameters such as TIFF0007734766000193.tif65, the overflow surface width of the overflow brick can be adjusted. TIFF0007734766000194.tif65, Critical shrinkage width of guide plate TIFF0007734766000195.tif65, stretching speed V, average edge thickness TIFF0007734766000196.tif65, average edge plate flow rate TIFF0007734766000197.tif65, average edge plate mass TIFF0007734766000198.tif66, Effective utilization rate of glass substrate TIFF0007734766000199.tif63, and edge plate flow contraction ratio By designing TIFF0007734766000200.tif64, the problem of undulations occurring during on-site forming when the drawing amount is increased can be effectively solved, the forming thickness distribution in glass substrate manufacturing can be optimized, the production margin can be increased in design, and the edge thickness of the glass substrate can be ensured to be consistent.

[0049] 3 shows the relationship between the edge plate flow contraction ratio and the overflow coefficient in this embodiment, which is substantially nonlinear. According to the formula in step 1, the stretched width TIFF0007734766000201.tif66 is the average edge width Actual overflow face width of overflow bricks related to the design of TIFF0007734766000202.tif66 TIFF0007734766000203.tif65 is the overflow factor Related to the design of TIFF0007734766000204.tif65.

[0050] In this example, the average edge width TIFF0007734766000205.tif622, Overflow Factor Let's say TIFF0007734766000206.tif629. Here, The main reason for setting this to TIFF0007734766000207.tif629 is that the height of the corresponding edge roller is nearly optimal at this time, and the pulling effect is also nearly optimal. The value of TIFF0007734766000208.tif65 may be determined according to specific circumstances.

[0051] In this embodiment, the target glass substrate width TIFF0007734766000209.tif625, Target glass substrate thickness TIFF0007734766000210.tif623, Target withdrawal amount TIFF0007734766000211.tif641. Overflow surface width of overflow brick TIFF0007734766000212.tif626, Critical shrinkage width of guide plate TIFF0007734766000213.tif620, drawing speed V=5323mm / min, average edge thickness TIFF0007734766000214.tif65=1.6751mm, average edge plate flow rate TIFF0007734766000215.tif638, average edge plate mass TIFF0007734766000216.tif628, Effective utilization rate of glass substrate TIFF0007734766000217.tif624, Edge plate flow contraction ratio The resulting file is TIFF0007734766000218.tif629.

[0052] 4 shows the relationship between the edge plate flow rate shrinkage ratio and the average edge plate thickness in another embodiment. It has been revealed that the average edge plate thickness of the glass substrate increases with the increase in the edge plate flow rate shrinkage ratio of the overflow brick. By selecting an appropriate edge plate flow rate shrinkage ratio, the average edge plate thickness of the glass substrate can be reduced. TIFF0007734766000219.tif65≧1.5mm while taking manufacturing costs into consideration.

[0053] 5 shows the relationship between the stretch width, stretch factor, overflow factor, and edge plate flow contraction ratio in another embodiment. In a known completed design, adjusting the height of the edge rollers during actual production will change the stretch width, stretch factor, overflow factor, and edge plate flow contraction ratio. Reducing the height of the edge rollers will tend to reduce the stretch width, and the stretch factor, overflow factor, and edge plate flow contraction ratio will also tend to decrease. In actual production, the height of the edge rollers will be set to an approximately optimal position, at which point the thickness distribution in the transition area between the edge plate and the effective surface is optimal and the stretching is most stable.

[0054] This embodiment provides an edge plate control method for improving the amount of overflow brick drawn out. In this design method, the target glass substrate width Based on TIFF0007734766000220.tif66, actual overflow coefficient TIFF0007734766000221.tif65 and average edge width Combined with TIFF0007734766000222.tif66, the stretched width of the glass substrate TIFF0007734766000223.tif66 and actual overflow surface width Calculate the average edge thickness of the glass substrate (TIFF0007734766000224.tif65). TIFF0007734766000225.tif67 is calculated and the final average edge thickness is calculated. TIFF0007734766000226.tif67 to meet the design needs. The parameters in this process are the actual critical shrinkage width of the guide plate to meet the process requirements of stable stretching in the glass substrate production line manufacturing. TIFF0007734766000227.tif65, stretching speed V, average edge plate flow rate TIFF0007734766000228.tif65, average edge plate mass TIFF0007734766000229.tif66, Effective utilization rate of glass substrate It is used to calculate other parameters of the overflow brick, including TIFF0007734766000230.tif63. By adjusting the drawing width of the glass substrate and the actual overflow coefficient, this method ensures that the thickness of the edge plate during the glass substrate forming process meets the needs, and solves the problem of undulations occurring during drawing due to the edge plate being too thin when the drawing amount is increased.

[0055] The above example is merely one of the embodiments that can realize the technical solution of the present invention, and the scope of the claims of the present invention is not limited to the example, but also includes modifications, alternatives, and other embodiments that may be easily conceived by a person skilled in the art within the scope of the disclosed technology of the present invention. [Explanation of symbols]

[0056] 1-Overflow brick; 2-Overflow groove; 3-Glass melt supply device; 4-Overflow brick base; 5-Formed glass substrate; 6-Downdraw direction of glass substrate; 7-Edge plate range

Claims

1. An edge plate control method for improving the amount of overflow bricks drawn out, Step S1: Using the overflow coefficient of the standard overflow brick system as the actual overflow coefficient of the actual overflow brick system, determine the average edge width, the effective surface width of the glass substrate and the thickness of the glass substrate according to the product specifications, calculate the stretched width from the average edge width and the effective surface width of the glass substrate, and calculate the actual overflow surface width by combining with the average edge width; Step S2: calculating the actual critical shrinkage width from the overflow face width and critical shrinkage width of the standard overflow brick system and the actual overflow face width; Step S3: calculating an average edge plate flow rate before shrinkage from the actual withdrawal amount of the overflow brick system, the effective surface width of the glass substrate, and the actual overflow surface width, and calculating an average edge plate flow rate after shrinkage from the average edge plate flow rate before shrinkage; Step S4: determining a downdraw factor of the glass substrate from the actual overflow surface width, the effective surface width of the glass substrate, and the thickness of the glass substrate; Step S5: calculate the average edge thickness from the thickness of the glass substrate, the average edge flow rate after shrinkage, the actual draw-out amount of the overflow brick system, the stretched width, and the effective surface width of the glass substrate; If the average edge thickness is equal to or greater than K*glass substrate thickness in step S5, output the current actual overflow coefficient and the corresponding actual overflow surface width; If the average edge thickness<K / glass substrate thickness in S5, adjust the actual overflow coefficient until the average edge thickness≧K / glass substrate thickness, and output the adjusted actual overflow coefficient and the adjusted corresponding actual overflow surface width in step S6; 2.5≦K≦3.5, In S1, the stretching width The specific formula is: and Actual overflow surface width The specific formula is: and where: is the overflow coefficient of a standard overflow brick system, is the average edge plate width, is the effective surface width of the glass substrate, In S2, the actual critical shrinkage width The specific formula is: and where: is the critical shrinkage width of a standard overflow brick system, is the overflow face width of a standard overflow brick system, In S3, the mean edge plate flow rate before contraction The specific formula is: and Average edge plate flow rate after contraction The specific formula is: and where: is the actual withdrawal amount of the overflow brick system, In S4, the downdraw factor of the glass substrate The specific formula is: and where: is the thickness of the glass substrate, In S5, the average edge thickness The specific formula is: An edge plate control method characterized by:

2. Effective surface width of glass substrate Cutting width of glass substrate and cutting height The density of the glass substrate is obtained. , mean edge plate flow rate after contraction , average edge thickness , stretch width , the effective surface width of the glass substrate , and the downdraw factor of the glass substrate Stretching speed The specific formula is: and Actual draw volume of the overflow brick system , stretching speed , cutting width , cut height , thickness of glass substrate , the effective surface width of the glass substrate , density of the glass substrate , average edge thickness , and the downdraw factor of the glass substrate From the average edge plate mass The specific formula is:

2. The edge plate control method for improving the amount of overflow bricks drawn out according to claim 1, wherein:

3. Actual draw volume of the overflow brick system and mean edge plate flow rate after contraction Effective utilization rate The specific formula is:

3. The edge plate control method for improving the amount of overflow bricks drawn out according to claim 2, wherein:

4. The edge plate control method for improving the withdrawal amount of overflow bricks as described in claim 1, further comprising step S7 of adjusting the actual overflow coefficient so that 3 times the thickness of the glass substrate≦average edge plate thickness≦5 times the thickness of the glass substrate.

5. An edge plate control system for improving the amount of overflow bricks drawn out, which implements the steps of the edge plate control method for improving the amount of overflow bricks drawn out according to any one of claims 1 to 4, A selection module configured to determine an average edge width, an effective surface width of the glass substrate, and a thickness of the glass substrate according to product specifications, using the overflow coefficient of a standard overflow brick system as an actual overflow coefficient of the actual overflow brick system, calculate an extension width from the average edge width and the effective surface width of the glass substrate, and calculate an actual overflow surface width in combination with the average edge width; an actual critical shrinkage width module configured to calculate an actual critical shrinkage width from the overflow face width and critical shrinkage width of a standard overflow brick system and the actual overflow face width; a post-shrinkage average edge plate flow rate module configured to calculate a pre-shrinkage average edge plate flow rate from the actual withdrawal amount of the overflow brick system, the effective surface width of the glass substrate, and the actual overflow surface width, and to calculate a post-shrinkage average edge plate flow rate from the pre-shrinkage average edge plate flow rate; a glass substrate downdraw factor module configured to calculate a downdraw factor of the glass substrate from an actual overflow surface width, an effective surface width of the glass substrate, and a thickness of the glass substrate; an average edge thickness module configured to calculate an average edge thickness from the thickness of the glass substrate, the average edge flow rate after shrinkage, the actual withdrawal amount of the overflow brick system, the extension width, and the effective surface width of the glass substrate; If the result of the determination in S5 is that the average edge thickness is equal to or greater than K·glass substrate thickness, output the current actual overflow coefficient and the corresponding actual overflow surface width; If the average edge plate thickness is less than K / thickness of the glass substrate in S5, adjust the actual overflow coefficient until the average edge plate thickness is equal to or greater than K / thickness of the glass substrate, and output the adjusted actual overflow coefficient and the adjusted corresponding actual overflow surface width, wherein 2.5≦K≦3.5.

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