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 overflow brick withdrawal. [Background technology]

[0002] Glass substrates used in the manufacturing field of flat panel displays such as general thin film transistor displays (TFT-LCDs) and organic light emitting diodes (OLEDs) are manufactured by the overflow downdraw method, and are manufactured by supplying the molten glass melted in a glass melting furnace to a melting overflow downdraw molding device in the molding process. In display manufacturing, the glass substrate is required to be large in size to improve production efficiency and reduce costs. The larger the glass substrate, the higher the production difficulty and the more complicated the quality control of the glass substrate. Overflow bricks are one of the core parts of the manufacturing molding device for glass substrates. In terms of technology, the instability of the flow rate and its distribution at the inlet of the overflow brick is likely to cause instability of the flow in the entire overflow groove, which is likely to cause irregularity in the flow rate distribution of the entire glass ribbon. In terms of products, any fluctuation in the production line can cause fluctuations in the drawing, which can lead to unstable production and a decrease in the rate of non-defective products. For glass substrate manufacturers, improving the drawing amount is one of the most conceivable ways to increase production volume and the efficiency of the production line.

[0003] However, in order to improve the amount of drawing, in addition to considering the design of the inlet groove of the overflow brick, it is also necessary to consider the balance control of the flow rate of the edge plate at the far and near ends from the overflow brick, and the uniformity of the distribution of the overall thickness. The control of the thickness of the glass substrate and its consistency is one of the very important design and process technologies. According to the actual needs, the overflow brick must generally accommodate the production of glass substrates with a thickness of 0.2-0.7 mm, so the design of the overflow brick must also accommodate the production of glass substrates with a thickness of 0.2-0.7 mm. Because the glass substrate is very thin, any fluctuation in the process during production, including air flow, heat field, etc., will affect the thickness of the formed glass substrate, and even have a negative impact on the quality of the display, so the overflow brick needs to be designed considering the impact of these complex factors on the thickness distribution of the glass substrate, that is, to increase the production margin in the design. Ensuring the improvement of the amount of drawing and at the same time ensuring that the product performance of the glass substrate meets the requirements of customers is one of the core technologies of overflow brick design.

[0004] As described above, the conventional method cannot solve the problem that the thin edge plate causes variations in elongation during the formation of the glass substrate after the drawing amount is increased. Summary of the Invention [Problem to be solved by the invention]

[0005] In order 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, by adjusting the drawing width and actual overflow coefficient of the glass substrate, so that the edge plate thickness in the glass substrate forming process meets the needs, and solves the problem that the edge plate thickness is too thin during the glass substrate forming process when the drawing amount is increased, resulting in wavy drawing. [Means for solving the problem]

[0006] To achieve the above object, the present invention adopts the following technical solutions.

[0007] An edge plate control method for improving the drawing amount of an overflow length, comprising: Regarding the overflow coefficient of a standard overflow length system as the actual overflow coefficient of the actual overflow length 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 a standard overflow length system, and the actual overflow surface width in step S2; Calculating the average edge plate flow rate before shrinkage from the drawing amount of the actual overflow length 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 drawing amount of the actual overflow length 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, 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 in step S6, including: 2.5 ≦ K ≦ 3.5.

[0008] Furthermore, in S1, the stretching width The specific formula of TIFF2025501825000002.tif66 is TIFF2025501825000003.tif640, Actual overflow surface width The specific formula for TIFF2025501825000004.tif65 is: TIFF2025501825000005.tif69, Where: TIFF2025501825000006.tif64 is the overflow coefficient of the standard overflow brick system, TIFF2025501825000007.tif66 is the average edge width, TIFF2025501825000008.tif66 is the effective surface width of the glass substrate.

[0009] Furthermore, in S2, the actual critical shrinkage width The specific formula for TIFF2025501825000009.tif65 is: TIFF2025501825000010.tif1221, Where: TIFF2025501825000011.tif68 is the critical shrinkage width of a standard overflow brick system, TIFF2025501825000012.tif67 is the overflow face width for a standard overflow brick system.

[0010] Furthermore, in S3, the mean pre-contraction marginal flow rate The specific formula for TIFF2025501825000013.tif67 is: TIFF2025501825000014.tif628, Average edge plate flow rate after contraction The specific formula for TIFF2025501825000015.tif65 is: TIFF2025501825000016.tif1252, Where: TIFF2025501825000017.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 TIFF2025501825000018.tif64 is: TIFF2025501825000019.tif1250, Where: TIFF2025501825000020.tif64 is the thickness of the glass substrate.

[0012] Furthermore, in S5, the average edge plate thickness The specific formula for TIFF2025501825000021.tif65 is: The file is TIFF2025501825000022.tif1236.

[0013] Furthermore, the effective surface width of the glass substrate Glass substrate cut width from TIFF2025501825000023.tif66 TIFF2025501825000024.tif66 and cut height TIFF2025501825000025.tif65 obtained, density of glass substrate TIFF2025501825000026.tif64, Post-contraction mean marginal plate flow rate TIFF2025501825000027.tif65, Average edge plate thickness TIFF2025501825000028.tif65, stretch width TIFF2025501825000029.tif66, Effective surface width of glass substrate TIFF2025501825000030.tif66 and downdraw factor of glass substrate Enlargement speed from TIFF2025501825000031.tif64 Calculate TIFF2025501825000032.tif65, the specific formula is: TIFF2025501825000033.tif625, Actual withdrawal volume of the overflow brick system TIFF2025501825000034.tif64, enlargement speed TIFF2025501825000035.tif65, cut width TIFF2025501825000036.tif66, Cut height TIFF2025501825000037.tif65, Glass substrate thickness TIFF2025501825000038.tif64, Effective surface width of glass substrate TIFF2025501825000039.tif66, Density of glass substrate TIFF2025501825000040.tif64, Average edge thickness TIFF2025501825000041.tif65 and downdraw factor of glass substrate Average edge plate mass from TIFF2025501825000042.tif64 Calculate TIFF2025501825000043.tif66, the specific formula is: The file is TIFF2025501825000044.tif674.

[0014] In addition, the actual drawer volume of the overflow brick system TIFF2025501825000045.tif64 and mean post-contraction edge plate flow rate Effective utilization rate from TIFF2025501825000046.tif65 Calculate TIFF2025501825000047.tif63, the specific formula is: The file is TIFF2025501825000048.tif631.

[0015] The method further includes a step S7 of further 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, which realizes the steps of the edge plate control method for improving the amount of overflow bricks drawn out, Taking the overflow coefficient of the standard overflow furnace system as the actual overflow coefficient of the actual overflow furnace system, the average edge plate width, the effective surface width of the glass substrate, and the thickness of the glass substrate are determined according to the product specifications. A selection module configured to calculate the extension width from the average edge plate width and the effective surface width of the glass substrate, and 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 and the critical shrinkage width of the standard overflow furnace system, 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 draw amount of the actual overflow furnace 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 down-draw factor module configured to obtain 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; 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 draw amount of the actual overflow furnace system, the extension 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, the current actual overflow coefficient and the corresponding actual overflow surface width are output; if the average edge plate thickness in S5 < K · the thickness of the glass substrate, the actual overflow coefficient is adjusted until the average edge plate thickness ≧ K · the thickness of the glass substrate, and the adjusted actual overflow coefficient and the adjusted corresponding actual overflow surface width are output. The determination output module, 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 withdrawal, the method being performed when the target glass substrate width is Based on TIFF2025501825000049.tif66, actual overflow coefficient TIFF2025501825000050.tif65 and average edge width Combined with TIFF2025501825000051.tif66, the stretch width of the glass substrate TIFF2025501825000052.tif66 and actual overflow width Calculate the average edge thickness of the glass substrate when manufacturing it. TIFF2025501825000054.tif67 is calculated and the final average edge plate thickness is TIFF2025501825000055.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 TIFF2025501825000056.tif65, stretching speed V, average edge plate flow rate TIFF2025501825000057.tif65, average edge plate mass TIFF2025501825000058.tif66, Effective utilization rate of glass substrate 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 plate thickness of the glass substrate.

[0019] Furthermore, by further 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, the average edge plate thickness is in a reasonable range, and the larger the average edge plate thickness is, the more stable the edge plate control is, and the more stable the stretching is.

[0020] The present invention also provides an edge plate control system for improving the drawing amount of the overflow brick, which realizes the steps of the above design method. According to the method of the system, the edge plate thickness in the glass substrate forming process meets the need, so as to solve the problem that the edge plate thickness is too thin in the glass substrate forming process, which causes wavy drawing, when the drawing amount is improved. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a structural schematic diagram of an overflow system according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a schematic diagram of an overflow downdraw structure according to an embodiment of the present invention. [Diagram 3] FIG. 4 is a schematic diagram of the relationship between edge plate flow contraction ratio and overflow factor according to an embodiment of the present invention. [Figure 4] FIG. 13 is a schematic diagram of edge plate flow contraction ratio versus average edge plate thickness according to another embodiment of the present invention. [Diagram 5] FIG. 13 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 diagram of an edge plate control method for improving the amount of overflow brick withdrawal according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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, and 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, and the extension 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 in combination with the average edge width; Stretch width The specific formula for TIFF2025501825000060.tif66 is: TIFF2025501825000061.tif640, Actual overflow surface width The specific formula for TIFF2025501825000062.tif65 is: TIFF2025501825000063.tif69, where TIFF2025501825000064.tif64 is the overflow coefficient of the standard overflow brick system, TIFF2025501825000065.tif66 is the average edge width, TIFF2025501825000066.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 TIFF2025501825000067.tif65 is: TIFF2025501825000068.tif1221, Where: TIFF2025501825000069.tif68 is the critical shrinkage width of a standard overflow brick system, TIFF2025501825000070.tif67 is the overflow face width for a standard overflow brick system.

[0026] S3: Calculate the average edge plate flow rate before shrinkage from the actual overflow brick system withdrawal amount, 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 TIFF2025501825000071.tif67 is: TIFF2025501825000072.tif628, Average edge plate flow rate after contraction The specific formula for TIFF2025501825000073.tif65 is: TIFF2025501825000074.tif1252, Where: TIFF2025501825000075.tif64 is the actual drawer amount of the overflow brick system.

[0027] S4: Calculate 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; Glass Substrate Downdraw Factor The specific formula for TIFF2025501825000076.tif64 is: TIFF2025501825000077.tif1250, Where: TIFF2025501825000078.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 pull-out amount of the overflow brick system, the stretched width, and the effective surface width of the glass substrate; Average edge thickness The specific formula for TIFF2025501825000079.tif65 is: It is TIFF2025501825000080.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 The cut width of the glass substrate from TIFF2025501825000081.tif66 The cut height from TIFF2025501825000082.tif66 and Obtain TIFF2025501825000083.tif65, and the density of the glass substrate TIFF2025501825000084.tif64, the average edge plate flow rate after shrinkage TIFF2025501825000085.tif65, the average edge plate thickness TIFF2025501825000086.tif65, the stretching width TIFF2025501825000087.tif66, the effective surface width of the glass substrate TIFF2025501825000088.tif66, and the drawdown factor of the glass substrate The stretching speed from TIFF2025501825000089.tif64 TIFF2025501825000090.tif65 may be calculated. The specific formula is TIFF2025501825000091.tif625, and The withdrawal amount of the actual overflow brick system TIFF2025501825000092.tif64, the stretching speed TIFF2025501825000093.tif65, Cut width TIFF2025501825000094.tif66, Cut height TIFF2025501825000095.tif65, Glass substrate thickness TIFF2025501825000096.tif64, Effective surface width of glass substrate TIFF2025501825000097.tif66, Density of glass substrate TIFF2025501825000098.tif64, Average edge plate thickness TIFF2025501825000099.tif65 and downdraw factor of glass substrate Average edge plate mass from TIFF2025501825000100.tif64 Calculate TIFF2025501825000101.tif66, the specific formula is: The file is TIFF2025501825000102.tif674.

[0031] On the other hand, the actual withdrawal amount of the overflow brick system TIFF2025501825000103.tif64 and mean post-contraction edge plate flow rate Effective utilization rate from TIFF2025501825000104.tif65 Calculate TIFF2025501825000105.tif63, the specific formula is: The file is TIFF2025501825000106.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, an actual 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 actual critical shrinkage width module is configured to calculate the actual 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 < 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 ≦ 3.5. Embodiment

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

[0035] As shown in FIG. 2, drawing is the basis for forming a glass substrate, and in the down-draw forming of the glass substrate, the forming glass substrate 5 is moved downward along the down-draw direction 6 of the glass substrate. TIFF2025501825000107.tif66 is the glass substrate width, TIFF2025501825000108.tif66 is the stretch width, TIFF2025501825000109.tif65 is the overflow brick effective surface width, TIFF2025501825000110.tif65 is the critical shrinkage width of the guide plate (i.e., the actual critical shrinkage width), TIFF2025501825000111.tif66 is the glass substrate cut width, TIFF2025501825000112.tif67 is the initial mean edge plate flow rate (i.e., the mean edge plate flow rate before contraction), TIFF2025501825000113.tif65 is the average edge plate flow rate after shrinkage, which 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. TIFF2025501825000114.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 TIFF2025501825000115.tif66 The difference between the width and the width of the edge plate is the thickness of the edge plate to be removed. TIFF2025501825000117.tif66Ensure 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 TIFF2025501825000118.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. TIFF2025501825000119.tif66 and design stretch width Determine TIFF2025501825000120.tif66. Stretch Width TIFF2025501825000121.tif66 and overflow coefficient of glass substrate TIFF2025501825000122.tif65 is calculated as follows, TIFF2025501825000123.tif640TIFF2025501825000124.tif69In the formula, TIFF2025501825000125.tif66 is the stretched width of the glass substrate (unit: mm), TIFF2025501825000126.tif66 is the effective surface width of the glass substrate (unit: mm), TIFF2025501825000127.tif65 is the overflow surface width of the overflow brick (actual overflow surface width) (unit: mm), TIFF2025501825000128.tif66 is the average edge width (unit: mm). From the above relationship, the overflow surface width of the overflow brick TIFF2025501825000129.tif65 can be determined.

[0038] Step 2: Critical shrinkage width of the guide plate Calculate TIFF2025501825000130.tif65. TIFF2025501825000131.tif1252 formula, TIFF2025501825000132.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). TIFF2025501825000133.tif1212 is the edge plate flow rate shrinkage ratio, and when the structure of the overflow brick is determined, TIFF2025501825000134.tif64 and TIFF2025501825000135.tif66 changes relative to the edge roller height (i.e., the edge roller height changes. Note: The edge roller is one of the important parts of the forming system). TIFF2025501825000136.tif65 will not change. TIFF2025501825000137.tif67 and TIFF2025501825000138.tif68 are the overflow surface width and the critical shrinkage width of the reference overflow brick, respectively. TIFF2025501825000139.tif67 shows the mean pre-contraction marginal flow rate (unit TIFF2025501825000140.tif617), TIFF2025501825000141.tif65 shows the average post-contraction marginal flow rate (unit TIFF2025501825000142.tif617).

[0039] Step 3: Glass Substrate Downdraw Factor Calculate TIFF2025501825000143.tif64. TIFF2025501825000144.tif1297In formula, TIFF2025501825000145.tif610 is the stretching factor, TIFF2025501825000146.tif64 is the thickness of the glass substrate (unit: mm).

[0040] Step 4: Glass substrate average edge thickness TIFF2025501825000147.tif65, average edge plate mass TIFF2025501825000148.tif66 and glass substrate effective utilization rate Calculate TIFF2025501825000149.tif63, (1) Average edge thickness TIFF2025501825000150.tif65TIFF2025501825000151.tif1269(2) Average edge plate mass TIFF2025501825000152.tif66TIFF2025501825000153.tif1074In the formula, TIFF2025501825000154.tif64 is the amount of glass substrate withdrawn (unit: kg / Hr), TIFF2025501825000155.tif65 is the enlargement speed (unit: mm / min), TIFF2025501825000156.tif64 is the density of the glass substrate (unit: kg / m 3 ), TIFF2025501825000157.tif66, TIFF2025501825000158.tif65 are the cut width and height (unit: mm) of the glass substrate.

[0041] (3) Effective utilization rate TIFF2025501825000159.tif63TIFF2025501825000160.tif1031In the formula, TIFF2025501825000161.tif65 is the average edge flow rate of the glass substrate (unit TIFF2025501825000162.tif617).

[0042] The design includes the actual overflow coefficient of the actual overflow brick system. TIFF2025501825000163.tif64 is equal to the overflow factor of the reference overflow brick.

[0043] Calculated average edge thickness For TIFF2025501825000164.tif614, use step 1 TIFF2025501825000165.tif64 Adjust to TIFF2025501825000166.tif615, and then use the corresponding actual overflow coefficient TIFF2025501825000167.tif65 and actual overflow width TIFF2025501825000168.tif65 can effectively control the average edge plate thickness, Calculated average edge thickness In the case of TIFF2025501825000169.tif615, TIFF2025501825000170.tif64 is the average edge thickness TIFF2025501825000171.tif65 is the edge plate flow rate contraction ratio that can be controlled, and the overflow coefficient TIFF2025501825000172.tif65 and overflow surface width of overflow brick TIFF2025501825000173.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, and therefore, once production starts, the value of K is a fixed value between 2.5 and 3.5.

[0044] TIFF2025501825000174.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 TIFF2025501825000175.tif65 is, the more stable the edge control will be and the more stable the stretching will be.

[0045] In step 1, the glass substrate is stretched to a TIFF2025501825000176.tif617, stretch factor The value range of TIFF2025501825000177.tif64 is 1.05≦α≦1.25.

[0046] In step 2, the edge plate flow rate contraction ratio The value range of TIFF2025501825000178.tif64 is 0.5≦ TIFF2025501825000179.tif64≦1.

[0047] In step 4, the average edge flow rate of the glass substrate TIFF2025501825000180.tif65 and enlargement speed TIFF2025501825000181.tif65 is calculated as follows, (1) Average edge flow rate of glass substrate TIFF2025501825000182.tif65TIFF2025501825000183.tif1029TIFF2025501825000184.tif1552(2) Enlargement speed TIFF2025501825000185.tif65TIFF2025501825000186.tif1025Edge plate flow rate contraction ratio in step 2 TIFF2025501825000187.tif64 is as follows. TIFF2025501825000188.tif1525

[0048] In this method, the standard size of the glass substrate in steps 1 to 4 is TIFF2025501825000189.tif66, process cut size TIFF2025501825000190.tif627 and TIFF2025501825000191.tif65, Average edge width TIFF2025501825000192.tif66, Designed drawer amount TIFF2025501825000193.tif64, overflow factor By combining parameters such as TIFF2025501825000194.tif65, the overflow surface width of the overflow brick can be set. TIFF2025501825000195.tif65, Critical shrinkage width of guide plate TIFF2025501825000196.tif65, stretching speed V, average edge thickness TIFF2025501825000197.tif65, average edge plate flow rate TIFF2025501825000198.tif65, average edge plate mass TIFF2025501825000199.tif66, Effective utilization rate of glass substrate TIFF2025501825000200.tif63 and edge plate flow rate contraction ratio By designing TIFF2025501825000201.tif64, the problem of wavy stretching during on-site forming when the drawing amount is increased can be effectively solved, the forming thickness distribution in the production of glass substrates can be optimized, the production margin can be increased in design, and the edge plate thickness of the glass substrate can be ensured to be consistent.

[0049] FIG. 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 stretch width TIFF2025501825000202.tif66 is the average edge width The actual overflow surface width of the overflow brick in relation to the design of TIFF2025501825000203.tif66 TIFF2025501825000204.tif65 is an overflow factor Related to the design of TIFF2025501825000205.tif65.

[0050] In this embodiment, the average edge width TIFF2025501825000206.tif622, overflow factor Let's say TIFF2025501825000207.tif629, where: The main reason for setting it to TIFF2025501825000208.tif629 is that at this time the height of the corresponding edge roller is nearly optimal, and the pulling effect is also nearly optimal. The value of TIFF2025501825000209.tif65 may be determined according to specific circumstances.

[0051] In this embodiment, the target glass substrate width TIFF2025501825000210.tif625, Target glass substrate thickness TIFF2025501825000211.tif623, target withdrawal amount TIFF2025501825000212.tif641. Overflow surface width of overflow brick TIFF2025501825000213.tif626, Critical shrinkage width of guide plate TIFF2025501825000214.tif620, drawing speed V=5323mm / min, average edge thickness TIFF2025501825000215.tif65=1.6751mm, average edge plate flow rate TIFF2025501825000216.tif638, average edge plate mass TIFF2025501825000217.tif628, Effective utilization rate of glass substrate TIFF2025501825000218.tif624, Edge plate flow rate contraction ratio The result is TIFF2025501825000219.tif629.

[0052] FIG. 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 glass substrate average edge plate thickness increases with the increase in the edge plate flow rate shrinkage ratio of the overflow brick, and by selecting an appropriate edge plate flow rate shrinkage ratio, the glass substrate average edge plate thickness can be reduced. TIFF2025501825000220.tif65≧1.5mm while taking manufacturing costs into consideration.

[0053] FIG. 5 shows the relationship between the stretch width, the stretch factor, the overflow factor and the edge plate flow rate shrinkage ratio in another embodiment. In a known completed design, when the height of the edge roller is adjusted in actual production, the stretch width, the stretch factor, the overflow factor and the edge plate flow rate shrinkage ratio will change. When the height of the edge roller is reduced, the stretch width tends to be reduced, and the stretch factor, the overflow factor and the edge plate flow rate shrinkage ratio also tend to be reduced. In actual production, the height of the edge roller is approximately at the optimal position, at which time 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 TIFF2025501825000221.tif66, actual overflow coefficient TIFF2025501825000222.tif65 and average edge width Combined with TIFF2025501825000223.tif66, the stretch width of the glass substrate TIFF2025501825000224.tif66 and actual overflow width Calculate the average edge thickness of the glass substrate when manufacturing it. TIFF2025501825000226.tif67 is calculated and the final average edge plate thickness is calculated. TIFF2025501825000227.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 production line of the glass substrate TIFF2025501825000228.tif65, stretching speed V, average edge plate flow rate TIFF2025501825000229.tif65, average edge plate mass TIFF2025501825000230.tif66, Effective utilization rate of glass substrate TIFF2025501825000231.tif63 is used to calculate other parameters of the overflow brick. According to this method, by adjusting the drawing width of the glass substrate and the actual overflow coefficient, the thickness of the edge plate in the forming process of the glass substrate meets the needs, and solves the problem that the thickness of the edge plate is too thin in the forming process of the glass substrate when the drawing amount is increased, which causes wavy drawing.

[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 above 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-Down-draw direction of glass substrate; 7-Edge plate range

Claims

1. A method for controlling an edge plate to improve the amount of overflow bricks drawn, comprising: Step S1: 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 by taking the overflow coefficient of the standard overflow brick system as the actual overflow coefficient of the actual overflow brick system, calculate the extension 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 of calculating the actual critical shrinkage width from the overflow face width and the 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 overflow brick system withdrawal amount, 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 of 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 overflow brick system pull-out amount, the stretched width, and the effective surface width of the glass substrate; If the average edge thickness in S5 is equal to or greater than K·glass substrate thickness, output the current actual overflow coefficient and the corresponding actual overflow surface width; Step S6 includes: if the average edge thickness is less than K·glass substrate thickness in S5, adjust the actual overflow coefficient until the average edge thickness is greater than or equal to K·glass substrate thickness; and output the adjusted actual overflow coefficient and the adjusted corresponding actual overflow surface width; 2.5≦K≦3.

5.

2. In S1, the stretch 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 width, 2. The edge plate control method for improving the amount of overflow brick drawn out as claimed in claim 1, wherein: is the effective surface width of the glass substrate.

3. In S2, the actual critical shrinkage width The specific formula is: and Where: is the critical shrinkage width of a standard overflow brick system, 3. The edge plate control method for improving the withdrawal amount of overflow bricks according to claim 2, characterized in that: is the overflow face width of a standard overflow brick system.

4. In S3, the average edge flow rate before contraction The specific formula is: and Average edge plate flow rate after contraction The specific formula is: and Where:

4. The edge plate control method for improving the withdrawal amount of overflow bricks according to claim 3, wherein: is the actual withdrawal amount of the overflow brick system.

5. In S4, the downdraw factor of the glass substrate The specific formula is: and Where: The edge plate control method for improving the withdrawal amount of the overflow brick according to claim 4, characterized in that: is the thickness of the glass substrate.

6. In S5, the average edge plate thickness The specific formula is: The edge plate control method for improving the amount of overflow bricks drawn out according to claim 5, characterized in that

7. Effective surface width of glass substrate Glass substrate cutting width and cut height The density of the glass substrate is obtained. , mean edge plate flow rate after contraction , average edge thickness , stretch width , effective surface width of glass substrate , and the downdraw factor of the glass substrate Stretching speed The specific formula is: and Actual withdrawal volume of the overflow brick system , stretching speed , Cut width , Cut height , thickness of glass substrate , effective surface width of glass substrate , density of glass substrate , average edge thickness , and the downdraw factor of the glass substrate Average edge plate mass from The specific formula is: The edge plate control method for improving the amount of overflow bricks drawn out according to claim 6, characterized in that

8. Actual withdrawal volume of the overflow brick system and mean post-contraction edge flow rate Effective utilization rate The specific formula is: The edge plate control method for improving the amount of overflow bricks drawn out according to claim 7, characterized in that

9. The edge plate control method for improving the withdrawal amount of the overflow bricks as described in claim 1, further comprising a 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.

10. An edge plate control system for improving the amount of overflow bricks drawn out, which realizes 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 9, A selection module configured to determine an average edge width, an effective surface width of a glass substrate, and a thickness of a glass substrate according to a product specification by using an overflow coefficient of a standard overflow brick system as an actual overflow coefficient of an actual overflow brick system, calculate an extension width from the average edge width and the effective surface width of a 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 the critical shrinkage width of a standard overflow brick system and the actual overflow face width; A post-shrinkage average edge plate flow rate module is configured to calculate a pre-shrinkage average edge plate flow rate from the actual overflow brick system withdrawal amount, the effective surface width of the glass substrate, and the actual overflow surface width, and 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 overflow brick system pull-out amount, the stretch width, and the effective surface width of the glass substrate; If the result of the judgment 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 thickness is less than K glass substrate thickness in S5, adjust the actual overflow coefficient until the average edge thickness is greater than or equal to K glass substrate thickness, 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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