High-strength low-creep overflow brick and design method thereof

Abstract

The invention discloses a high-strength low-creep overflow brick and a design method thereof, and belongs to the technical field of glass substrate manufacturing. Taking a mature overflow brick for manufacturing the glass substrate as a reference overflow brick, and obtaining structural parameters of the reference overflow brick, structural parameters of a target design overflow brick and a creep stress index; establishing a similar relationship between the reference overflow brick and the designed overflow brick, and constructing an equation set about the first height and the second height of the inlet section of the designed overflow brick; the equivalent thickness, the equivalent height base value and the equivalent height of the reference overflow brick and the design overflow brick are obtained by applying the similarity relation and known parameters; and then the supporting surface length of the designed overflow brick and the maximum cylinder pressure of a clamping cylinder are obtained according to known parameters, and the design of the high-strength low-creep overflow brick is completed. By adopting the design method, the structural strength of the overflow brick, the clamping cylinder process and long-time creep design optimization can be effectively supported, and the stability of the quality of the formed guide plate is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of glass substrate manufacturing, and in particular to a high-strength low-creep overflow brick and a design method thereof. Background Art

[0002] In the field of precision manufacturing of TFT-LCD (thin-film transistor display) flat panel displays, the production of glass substrates relies on the precise control of overflow down-pull technology, which produces glass substrates that meet strict standards by conveying molten glass from a glass melting furnace to a molten overflow down-pull molding device. In this process, ensuring that the glass substrate has uniform thickness, low residual stress, and precise warpage control is a key challenge in the manufacturing process.

[0003] As the core component of the forming device, the structural design of the overflow brick is particularly critical. With the evolution of product generations and the increase in the amount of lead-out, higher optimization requirements are put forward for the overflow system structure, especially the structural design of the overflow brick, to ensure the stability of the glass guide plate.

[0004] When evaluating the performance of overflow bricks, it is necessary to comprehensively consider their chemical composition, organizational structure, mechanical properties, thermal properties and high-temperature performance. Among them, the flexural strength and creep properties at high temperatures are important indicators to measure their performance. High-temperature flexural strength reflects the ability of the material to resist bending stress in a high-temperature environment, while high-temperature creep describes the strain change of the material over time under constant stress.

[0005] In order to accurately control the thickness of the glass substrate, when designing the overflow brick, the influence of various complex factors on the thickness distribution of the glass substrate must be fully considered. These factors include but are not limited to self-weight stress, the gravity of the glass liquid, and the bending stress of the clamping cylinder. At the same time, given the high temperature conditions of the working environment (about 1207℃), it is also necessary to accurately calculate the creep rate in the actual environment to accurately predict and control the influence of creep on the molding thickness. In this process, a reasonable clamping cylinder pressure is the basis for effectively controlling the creep amount, thereby ensuring the accuracy and stability of the glass substrate.

[0006] Therefore, how to design overflow bricks with high strength and low creep performance, while ensuring that the clamping cylinder pressure is within a reasonable range to meet the high-precision requirements for glass substrates in the manufacture of TFT-LCD (thin-film transistor display) flat panel displays, has become an important technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0007] The purpose of the present invention is to provide a high-strength and low-creep overflow brick and a design method thereof, so as to overcome the problem that the overflow brick in the prior art is prone to strength reduction and creep increase in a high temperature environment.

[0008] The present invention solves the above technical problems through the following technical solutions:

[0009] A design method for high-strength low-creep overflow bricks comprises the following steps:

[0010] Step 1: Select the overflow brick used for manufacturing mature glass substrates as the reference overflow brick, and obtain the structural parameters of the reference overflow brick. The structural parameters of the reference overflow brick include the overflow groove depth h of the inlet section. ref , the first height of the inlet section h 1ref , the second height of the inlet section h 2ref 、Overflow weir inclination angle φ ref 、 Overflow slope angle θ ref , overflow brick tip chamfer radius R ref , overflow surface width W ref , Overflow brick support surface length l ref 、Overflow slot width w ref and overflow tank wall thickness B ref ;

[0011] And determine the structural parameters and creep stress index n of the overflow brick design. The structural parameters of the overflow brick design include the overflow groove width w of the overflow brick, the overflow groove depth h of the inlet section, the overflow weir inclination angle φ, the overflow slope angle θ, the overflow brick tip chamfer radius R and the overflow surface width W;

[0012] Step 2: According to the structural parameters of the reference overflow brick obtained in step 1, calculate the proximal crotch height H of the reference overflow brick Iref and distal crotch height H Oref ;

[0013] Step 3: Calculate the first average crotch height H of the reference overflow brick according to the parameters obtained in step 1 and step 2. 1ref and the second average crotch height H 2ref ;

[0014] Step 4: Establish a similarity relationship between the reference overflow brick and the designed overflow brick, the similarity relationship including the similarity relationship of the overflow groove wall thickness, the first average crotch height similarity relationship and the second average crotch height similarity relationship;

[0015] Step 5: Calculate the overflow trough wall thickness B of the designed overflow brick based on the similarity relationship of the overflow trough wall thickness;

[0016] Step 6: According to the parameters obtained in steps 1 to 3 and step 5 and the similarity relationship in step 4, a set of equations for designing the first height h1 and the second height h2 of the inlet cross section of the overflow brick is established, and the set of equations is solved to calculate the first height h1 and the second height h2 of the inlet cross section;

[0017] Step 7: Calculate the strength parameters of the reference overflow brick and the designed overflow brick according to the parameters obtained in the above steps, the strength parameters include equivalent thickness, equivalent height bottom value and equivalent height;

[0018] Step 8: Based on the parameters obtained in step 7, calculate the support surface length 1 of the overflow brick and the maximum cylinder pressure P of the clamping cylinder. max , completed the design of high-strength and low-creep overflow bricks.

[0019] Further, in step 2, refer to the proximal crotch height H of the overflow brick Iref for:

[0020]

[0021] Refer to the far end crotch height H of the overflow brick Oref for:

[0022] H Oref =H Iref +h ref -W ref ×tanφ ref .

[0023] Further, referring to the first average crotch height H of the overflow brick 1ref for:

[0024]

[0025] Reference overflow brick second average crotch height H 2ref for:

[0026] H 2ref =H 1ref +(h 1ref -H Iref ).

[0027] Furthermore, in step 4, the similarity relationship of the overflow tank wall thickness is:

[0028]

[0029] The first average crotch height similarity relationship is:

[0030]

[0031] The second average crotch height similarity relationship is:

[0032]

[0033] Wherein, H1 is the first average crotch height of the overflow brick; H2 is the second average crotch height of the overflow brick; w2 is the crotch width corresponding to the second average crotch height H2 of the overflow brick; w 2ref The second average crotch height H of the overflow brick is2ref Corresponding crotch width.

[0034] Furthermore, in step 5, the overflow trough wall thickness B of the overflow brick is designed to be:

[0035]

[0036] Furthermore, in step six, the equation group for designing the overflow brick with respect to the first height h1 of the inlet section and the second height h2 of the inlet section is:

[0037] Equation 1: Design of the proximal crotch height H of the overflow brick I , specifically:

[0038]

[0039] Equation 2: Design of the far end height H of the overflow brick O , specifically:

[0040] H O =H I +hW×tanφ

[0041] Equation 3: The first average crotch height H1 of the overflow brick is designed as follows:

[0042]

[0043] Equation 4: The second average crotch height H2 of the overflow brick is designed as follows:

[0044] H2=H1+(h1-H I )

[0045] Equation 5: The crotch width w2 corresponding to the second average crotch height H2 of the designed overflow brick is specifically:

[0046]

[0047] Equation 6: Based on the similarity relationship of the first average crotch height in step 4, the equation for designing the first average crotch height H1 of the overflow brick is listed, specifically:

[0048]

[0049] Equation 7. Based on the similarity relationship of the second average crotch height in step 4, the equation for designing the second average crotch height H2 of the overflow brick is listed, specifically:

[0050]

[0051] Furthermore, in step 7, the equivalent thickness of the reference overflow brick and the designed overflow brick is:

[0052]

[0053] The equivalent bottom height values ​​of the reference overflow brick and the designed overflow brick are:

[0054]

[0055] The equivalent heights of the reference overflow brick and the designed overflow brick are:

[0056] d = d′×(-1.718936×10 -5 ×(b×d′×W×ρ y )+1.169457)

[0057] d ref =d′ ref ×(-1.718936×10 -5 ×(b ref ×d′ ref ×W ref ×ρ y )+1.169457)

[0058] Where, b is the equivalent thickness of the designed overflow brick; b ref is the equivalent thickness of the reference overflow brick; d′ is the equivalent bottom height of the designed overflow brick; d′ ref is the equivalent height bottom value of the reference overflow brick; d is the equivalent height of the designed overflow brick; d ref is the equivalent height of the reference overflow brick; ρ y is the density of overflow brick material.

[0059] Further, in step eight, the support surface length 1 of the overflow brick is designed to be

[0060]

[0061] Furthermore, in step eight, the maximum cylinder pressure P of the clamping cylinder of the overflow brick is designed. max for

[0062] P max =1.251×W×b×d×ρ y .

[0063] A high-strength low-creep overflow brick is designed and manufactured based on the design method of the high-strength low-creep overflow brick.

[0064] Compared with the prior art, the positive and progressive effects of the present invention are:

[0065] The design method of the high-strength and low-creep overflow brick provided by the present invention takes the mature overflow brick for manufacturing glass substrates as a design reference, obtains the structural parameters of the reference overflow brick, the structural parameters of the target designed overflow brick and the creep stress index; establishes a similarity relationship between the reference overflow brick and the designed overflow brick, and constructs a set of equations about the first and second heights of the inlet section of the designed overflow brick; by using the similarity relationship and known parameters, the equivalent thickness, the equivalent height bottom value and the equivalent height of the reference overflow brick and the designed overflow brick are obtained; then, according to the known parameters, the support surface length of the designed overflow brick and the maximum cylinder pressure of the clamping cylinder are obtained, and the design of the high-strength and low-creep overflow brick is completed; it can effectively support the structural strength of the overflow brick, the clamping cylinder process and the long-term creep design optimization, and ensure the stability of the quality of the forming guide plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The drawings in the specification are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0067] Figure 1 It is a structural schematic diagram of the overflow system of the present invention;

[0068] Figure 2 It is a schematic diagram of the structure of overflow down-drawn glass of the present invention;

[0069] Figure 3 This is a schematic diagram of the stress-bearing structure of the overflow brick support strength of the present invention;

[0070] Figure 4 This is a schematic diagram of the force structure of the overflow brick clamping cylinder of the present invention;

[0071] Figure 5 This is a schematic diagram of the overflow brick structure details of the present invention;

[0072] Figure 6 Schematic diagram of volume flow distribution and volume differential flow distribution of overflow brick of the present invention; 6-a is volume flow distribution, 6-b is volume differential flow distribution; blue line segment represents before creep, and red line segment represents after creep;

[0073] Figure 7 Schematic diagram of the structure of the overflow brick of the present invention before and after creep; 7-a is the structure before creep, and 7-b is the structure after creep.

[0074] Among them, 1 is the overflow brick, 2 is the overflow trough, 3 is the glass liquid feeding device, 4 is the root of the overflow brick, 5 is the guide plate, 6 is the formed glass substrate, 7 is the pull-down direction of the glass substrate, W G is the width of the glass substrate, W Yis the width of the glass substrate guide plate; B is the overflow groove wall thickness of the overflow brick, W is the overflow surface width, w is the overflow groove width, h is the overflow groove depth of the inlet section, R is the chamfer radius of the overflow brick tip, φ is the overflow weir inclination angle, θ is the overflow bevel angle, h1 is the first height of the overflow brick inlet section, h2 is the second height of the inlet section, H O H is the far end height of the overflow brick. I is the proximal crotch height of the overflow brick, L is the total length of the overflow brick; l is the length of the supporting surface. DETAILED DESCRIPTION

[0075] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0076] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0077] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0078] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0079] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0080] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0081] The present invention is further described in detail below in conjunction with the accompanying drawings, which are intended to explain the present invention rather than to limit it.

[0082] See also Figure 1 The overflow system is composed of an overflow brick 1 and a glass liquid feeding device 3. An overflow trough 2 is provided in the overflow brick 1, and the bottom of the overflow brick 1 is an overflow brick root 4. When the glass substrate is manufactured by a molten overflow method, the glass liquid melted by the glass melting furnace is supplied to the glass liquid feeding device 3 in the molten overflow molding device in the molding process, and overflows along the overflow trough 2 through both sides of the overflow brick 1, and forms a glass substrate from below the overflow brick root 4.

[0083] As the glass melt is pushed from the proximal end to the distal end of the overflow trough, it is pushed by the mass force and pressure in the running direction, overcomes the laminar viscous resistance and flows downward from the overflow weir. The fluid dynamics equation based on this principle integrates the effects of the above forces and is the basis for the design of the overflow trough. On the vertical surface of the overflow, the mass force and pressure are large enough, and the viscosity is relatively low, the effect of the lateral surface tension is very small, and there is almost no lateral contraction; on the inclined surface, the mass force and pressure components along the inclined surface become significantly smaller, and the viscosity gradually increases, the effect of the lateral surface tension becomes prominent, and a significant lateral contraction occurs. Therefore, a platinum material drainage plate 5 is provided at the proximal and distal ends of the inclined surface of the overflow brick to partially resist the lateral contraction of the glass.

[0084] See also Figure 2 The guide plate serves as the molding basis of the glass substrate. During the process of pulling down the glass substrate, the molded glass substrate 5 moves downward along the glass substrate pulling direction 6. G is the width of the glass substrate, W Y is the width of the glass substrate lead.

[0085] See also Figure 3 , the force on the overflow brick support part and the gravity F (the gravity of the overflow brick and glass) must establish a balanced relationship to ensure the support strength. Figure 4 The pressure P of the overflow brick clamping cylinder should resist the deformation of the overflow brick caused by gravity F (the gravity of the overflow brick and glass) as much as possible. Figure 5 and Figure 7, after long-term creep, the overflow brick bends downward, resulting in the change of the glass substrate becoming thicker in the middle and thinner on both sides, which seriously affects the stability of the guide plate. When designing overflow bricks, it is necessary to consider the influence of various complex factors on the thickness distribution of the glass substrate, and increase the production margin from the design to ensure that the thermal stability and stress of the overflow brick are within the safe range of the ultimate flexural stress. The bending stress of the overflow brick includes self-weight stress, glass liquid gravity, traction feedback stress and clamping cylinder bending stress. Among them, the traction stress can be ignored. The average working environment temperature is about 1207℃. The creep rate in the actual muffle furnace environment must be calculated to accurately estimate the creep amount of the overflow brick. At the same time, in order to facilitate accurate calculation, the series creep rate of different ambient temperatures, external stresses and insulation time is measured. The influence of overflow brick creep on the forming thickness can be verified by forming overflow simulation or overflow brick design flow analysis; overflow brick creep leads to the trend of thinning at the far and near ends of the formed glass substrate and thickening in the middle. Therefore, the design of the overflow brick structure must first consider the flexural strength. At the same time, a reasonable clamping cylinder pressure is the basis for effectively controlling the creep amount. In addition, the overflow brick creep stress factor n is taken into consideration when designing the overflow brick structure, so that the strength and creep of the designed overflow brick can be higher than that of the reference overflow brick, and the creep amount of the overflow brick is controlled by the cylinder pressure process.

[0086] See also Figure 6 , is a schematic diagram of the volume flow distribution and volume differential flow distribution of the overflow brick. Among them, Figure 6 -a is the volume flow distribution. Before creep, the flow rate decreases approximately uniformly from the near end to the far end (approximately a straight line sloping downward), as shown by the blue line segment in the figure; after creep, the rate of decrease of the flow rates at the near and far ends slows down, and the curves tend to be upward, indicating that the amount of glass flowing out is less than before creep, while the rate of decrease of the flow rate in the middle is accelerated, and the downward slope of the curve becomes larger, indicating that the amount of glass flowing out is more than before creep, as shown by the red line segment in the figure. Figure 6 -b is the volume differential flow distribution, which is Figure 6 The curve derived from the -a curve is proportional to the thickness distribution of the glass substrate. It can be seen that creep causes the glass substrate to become thicker in the middle and thinner on both sides. The above seriously affects the molding quality of the glass substrate and the stability of the lead plate.

[0087] The present invention provides a method for designing high-strength and low-creep overflow bricks, comprising the following steps:

[0088] Select the overflow bricks used in mature glass substrate manufacturing as a design reference and obtain the relevant design parameters of the reference overflow bricks: overflow groove width w ref 、Overflow tank height h ref 、Overflow tank wall thickness B ref ; Overflow brick shape structure entrance section first height h 1ref , the second height of the inlet section h 2ref 、Overflow weir inclination angle φ ref、Overflow slope angle θ ref , overflow brick tip chamfer radius R ref , overflow surface width W ref and overflow brick support surface length l ref ; Obtain the design parameters related to the overflow brick design: overflow groove width w and overflow groove depth h; overflow brick shape structure overflow weir inclination angle φ, overflow slope angle θ, overflow brick tip chamfer radius R, overflow surface width W; Obtain the overflow brick creep stress index n;

[0089] According to the acquired parameters and the creep stress index of the flow brick, the similarity relationship between the overflow groove wall thickness of the overflow brick, the first average crotch height and the second average crotch height is established, and the overflow groove wall thickness of the designed overflow brick, the first height of the designed overflow brick inlet section and the second height of the inlet section are calculated;

[0090] At the same time, a similar relationship between the support length of the overflow brick support surface is established, and the strength parameters of the reference overflow brick and the designed overflow brick are calculated based on the known parameters. The strength parameters include equivalent thickness, equivalent height bottom value and equivalent height. The support length of the designed overflow brick support surface and the maximum cylinder pressure of the overflow brick non-bending clamping cylinder are further calculated; the overflow brick clamping cylinder pressure process is established to complete the external structure design of the high-strength and low-creep overflow brick.

[0091] Specifically, the specific formula for the similarity relationship between the overflow brick overflow trough wall thickness is:

[0092]

[0093] Among them, B and B ref The overflow trough wall thickness of the design and reference overflow bricks; W and W ref The overflow widths of the design and reference overflow bricks are h and h respectively. ref are the overflow groove depths of the design and reference overflow brick inlet sections, respectively, and n is the creep stress index of the overflow brick.

[0094] Specifically, the specific formula for the similarity relationship of the first average crotch height of the overflow brick is:

[0095]

[0096] Among them, H1 and H 1ref The first average crotch height of the design and reference overflow bricks, respectively; w and w ref are the overflow groove widths of the designed and reference overflow bricks respectively; w+2×B is the crotch width corresponding to the first average crotch height H1 of the designed overflow brick, that is, the thickness of the designed overflow brick, which is formed by the width of the overflow groove of the designed overflow brick plus the wall thickness of the overflow groove of the designed overflow brick.

[0097] Specifically, the specific formula for the similarity relationship of the second average crotch height of the overflow brick is:

[0098]

[0099] Among them, H2 and H 2ref w2 is the crotch width corresponding to the second average crotch height H2 of the designed overflow brick; w 2ref The second average crotch height H of the overflow brick is 2ref Corresponding crotch width.

[0100] In particular, the specific formula for the first average crotch height of overflow bricks is:

[0101]

[0102] Among them, H I and H Iref The design and reference overflow brick proximal crotch heights are respectively; H O and H Oref The design and reference far end crotch height of overflow brick are respectively.

[0103] In particular, the specific formula for the second average crotch height of overflow bricks is:

[0104] H2=H1+(h1-H I )

[0105] H 2ref =H 1ref +(h 1ref -H Iref )

[0106] Among them, h1 and h 1ref The first height of the overflow brick inlet section is designed and referenced respectively.

[0107] In particular, the specific formula for the crotch height of the overflow brick near the end is:

[0108]

[0109] Among them, h2 and h 2ref The second height of the overflow brick inlet section for design and reference respectively; θ and θ ref The overflow slope angles of the design and reference overflow bricks are R and R ref The chamfer radius of the design and reference overflow bricks respectively.

[0110] In particular, the specific formula for the crotch height of the overflow brick at the far end is:

[0111] H O =H I +hW×tanφ

[0112] H Oref =H Iref +href -W ref ×tanφ ref

[0113] Among them, h and h ref The overflow trough depths of the design and reference overflow bricks are φ and φ ref The inclination angles of overflow brick and overflow weir are designed and reference respectively.

[0114] In particular, the crotch width w2 corresponding to the second average crotch height H2 of the overflow brick is designed and the second average crotch height H 2ref Corresponding crotch width w 2ref The specific formula is:

[0115]

[0116] Specifically, the specific formula for the similarity relationship of the overflow brick support surface length is:

[0117]

[0118] Among them, 1 and l ref The design and reference overflow brick support surface lengths d and d are ref Design and reference overflow brick equivalent heights respectively.

[0119] In particular, the specific formula for the equivalent height of overflow bricks is:

[0120] d = d′×(-1.718936×10 -5 ×(b×d′×W×ρ y )+1.169457)

[0121] d ref =d′ ref ×(-1.718936×10 -5 ×(b ref ×d′ ref ×W ref ×ρ y )+1.169457)

[0122] Among them, b and b ref The equivalent thickness of the overflow bricks for design and reference, respectively; d′ and d′ ref The equivalent bottom height of the overflow brick for design and reference, respectively; ρ y is the density of overflow brick material.

[0123] In particular, the specific formula for the equivalent height bottom value of the overflow brick is:

[0124]

[0125] In particular, the specific formula for the equivalent thickness of overflow bricks is:

[0126]

[0127] Specifically, the specific formula for the maximum cylinder pressure of the overflow brick without bending and clamping the cylinder is:

[0128] P max =1.251×W×b×d×ρ y

[0129] Among them, P max The maximum cylinder pressure of the clamping cylinder for designing overflow bricks without bending, in kg, ρ y To design the density of overflow brick material.

[0130] In particular, when the overflow brick is not creeping in the initial use, the deformation of the overflow brick is in the order of μm, and the initial value of the clamping cylinder pressure before the lead plate (heating, wetting) is about 0.85×P max The recommended clamping cylinder pressure after the lead plate is (0.90~0.95)×P max ; After the overflow brick creep continues to increase, the cylinder clamping force should not exceed P max .

[0131] The present invention is described in further detail below in conjunction with embodiments:

[0132] 1. Obtain the relevant design parameters of the reference overflow brick: overflow groove width w ref 、Overflow tank height h ref 、Overflow tank wall thickness B ref ; Overflow brick shape structure entrance section first height h 1ref , the second height of the inlet section h 2ref 、Overflow weir inclination angle φ ref 、Overflow slope angle θ ref , overflow brick tip chamfer radius R ref , overflow surface width W ref and overflow brick support surface length l ref .

[0133] 2. Obtain the design parameters related to the overflow brick: overflow groove width w and overflow groove depth h; overflow brick external structure overflow weir inclination angle φ, overflow slope angle θ, overflow brick tip chamfer radius R, overflow surface width W.

[0134] 3. Obtain the creep stress index n of the overflow brick.

[0135] 4. Calculate and design the overflow brick overflow trough wall thickness:

[0136]

[0137] Among them, B and B ref The overflow trough wall thickness of the design and reference overflow bricks; W and W ref The overflow widths of the design and reference overflow bricks are h and h respectively. ref are the overflow groove depths of the design and reference overflow brick inlet sections, respectively, and n is the creep stress index of the overflow brick.

[0138] 5. Calculate and design the first height h1 and second height h2 of the inlet section of the overflow brick structure

[0139] L1, calculate the height of the overflow brick near the end (where h1 and h2 are unknown parameters):

[0140]

[0141] Among them, w and w ref The overflow groove widths of the design and reference overflow bricks are h1 and h2, respectively. 1ref The first height of the overflow brick inlet section for design and reference respectively; h2 and h 2ref The second height of the overflow brick inlet section for design and reference respectively; θ and θ ref The overflow slope angles of the design and reference overflow bricks are R and R ref The chamfer radius of the design and reference overflow bricks respectively.

[0142] L2, calculate the crotch height of the far end of the overflow brick (where h1 and h2 are unknown parameters):

[0143] H O =H I +hW×tanφ

[0144] H Oref =H Iref +h ref -W ref ×tanφ ref

[0145] Among them, h and h ref The overflow trough depths of the design and reference overflow bricks are φ and φ ref The inclination angles of overflow brick and overflow weir are designed and reference respectively.

[0146] L3, calculate the first average crotch height of the overflow brick (where h1 and h2 are unknown parameters):

[0147]

[0148] L4, calculate the second average crotch height of the overflow brick (where h1 and h2 are unknown parameters):

[0149] H2=H1+(h1-H I )

[0150] H 2ref =H 1ref +(h 1ref -H Iref )

[0151] L5, calculate the crotch width corresponding to the second average crotch height of the overflow brick (where h1 and h2 are unknown parameters):

[0152]

[0153] L6, calculate the first average crotch height of the overflow brick (where h1 and h2 are unknown parameters):

[0154]

[0155] L7, calculate the second average crotch height of the overflow brick (where h1 and h2 are unknown parameters):

[0156]

[0157] L8, combine L1, L2, L3, L4, L5, L6, and L7 to solve the equation group and obtain the first height h1 and the second height h2 of the designed overflow brick inlet section.

[0158] 6. Calculate and design the overflow brick support surface length 1

[0159] S1. Calculate the equivalent thickness of overflow bricks:

[0160]

[0161] S2. Calculate the equivalent height bottom value of the overflow brick:

[0162]

[0163] S3. Calculate the equivalent height of overflow bricks:

[0164] d = d′×(-1.718936×10 -5 ×(b×d′×W×ρ y )+1.169457)

[0165] d ref =d′ ref ×(-1.718936×10 -5 ×(b ref ×d′ ref ×W ref ×ρ y )+1.169457)

[0166] Among them, ρ y is the density of overflow brick material.

[0167] S4. Calculate and design the overflow brick support surface length:

[0168]

[0169] 7. Calculate and design the maximum cylinder pressure P of the overflow brick without bending clamping cylinder max

[0170] P max =1.251×W×b×d×ρ y

[0171] Among them, ρ y To design the density of overflow brick material.

[0172] In the initial use of overflow bricks, before creep, the deformation of overflow bricks is in the order of μm, and the initial value of the clamping cylinder pressure before the lead plate (heating, wetting) is about 0.85×P max The recommended clamping cylinder pressure after the lead plate is (0.90~0.95)×P max ; After the overflow brick creep continues to increase, the cylinder clamping force should not exceed P max .

[0173] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A design method for high-strength and low-creep overflow bricks. It is characterized in that The following steps are involved: Step 1: Select a mature overflow brick for glass substrate manufacturing as a reference overflow brick, and obtain the structural parameters of the reference overflow brick. The structural parameters of the reference overflow brick include the depth h of the overflow groove of the inlet cross section. ref , the first height of the inlet section h 1ref , the second height of the inlet section h 2ref 、Overflow weir inclination angle φ ref 、 Overflow slope angle θ ref , overflow brick tip chamfer radius R ref , overflow surface width W ref , Overflow brick support surface length l ref 、Overflow slot width w ref and overflow tank wall thickness B ref ; and determining the structural parameters and creep stress index n of the overflow brick design, wherein the structural parameters of the overflow brick design include the overflow groove width w of the overflow brick, the overflow groove depth h of the inlet section, the overflow weir inclination angle φ, the overflow slope angle θ, the overflow brick tip chamfer radius R and the overflow surface width W; Step 2: According to the structural parameters of the reference overflow brick obtained in step 1, calculate the proximal crotch height H of the reference overflow brick Iref and distal crotch height H Oref ; Step 3: Calculate the first average crotch height H of the reference overflow brick according to the parameters obtained in step 1 and step 2. 1ref and the second average crotch height H 2ref ; Step 4: establishing a similarity relationship between the reference overflow brick and the designed overflow brick, wherein the similarity relationship includes a similarity relationship of overflow groove wall thickness, a first average crotch height similarity relationship, and a second average crotch height similarity relationship; Step 5: Calculate the overflow trough wall thickness B of the designed overflow brick based on the similarity relationship of the overflow trough wall thickness; Step 6: Based on the parameters obtained in steps 1 to 3 and step 5 and the similarity relationship described in step 4, establish the first height h of the overflow brick inlet cross section design. 1 and the second height of the inlet section h 2 Solve the equations to calculate the first height h of the inlet section 1 and the second height of the inlet section h 2 ; Step 7: Calculate the strength parameters of the reference overflow brick and the designed overflow brick according to the parameters obtained in the above steps, wherein the strength parameters include equivalent thickness, equivalent height bottom value and equivalent height; Step 8: Based on the parameters obtained in step 7, calculate the support surface length 1 of the overflow brick and the maximum cylinder pressure P of the clamping cylinder. max , completed the design of high-strength and low-creep overflow bricks.

2. A design method for high-strength, low-creep overflow bricks according to claim 1, It is characterized in that In step 2, the near end crotch height H of the reference overflow brick Iref for: The distal crotch height H of the reference overflow brick Oref for: H Oref =H Iref +h ref -W ref ×tanφ ref 。 3. A design method for high-strength, low-creep overflow bricks according to claim 2, It is characterized in that In step 3, the first average crotch height H of the reference overflow brick 1ref for: The second average crotch height H of the reference overflow brick 2ref for: H 2ref =H 1ref +(h 1ref -H Iref )。 4. A design method for high-strength, low-creep overflow bricks according to claim 3, It is characterized in that In step 4, the similarity relationship of the overflow tank wall thickness is: The first average crotch height similarity relationship is: The second average crotch height similarity relationship is: Among them, H 1 H is the first average crotch height of the overflow brick; 2 The second average crotch height of the overflow brick; w 2 Design overflow brick second average crotch height H 2 Corresponding crotch width; w 2ref The second average crotch height H of the overflow brick is 2ref Corresponding crotch width.

5. A design method for high-strength and low-creep overflow bricks according to claim 4, It is characterized in that In step 5, the overflow trough wall thickness B of the overflow brick is designed to be:

6. A design method for high-strength and low-creep overflow bricks according to claim 5, It is characterized in that In step 6, the overflow brick is designed with respect to the first height h of the inlet section. 1 and the second height of the inlet section h 2 The system of equations is: Equation 1: About the design of the proximal crotch height H of the overflow brick I , specifically: Equation 2: Design of the far end height H of the overflow brick O , specifically: H O =H I +h-W×tanφ Equation 3: The first average crotch height H of the overflow brick design 1 , specifically: Equation 4: The second average crotch height H of the overflow brick design 2 , specifically: H 2 =H 1 +(h 1 -H I ) Equation 5: The second average crotch height H of the overflow brick design 2 Corresponding crotch width w 2 , specifically: Equation 6: Based on the similarity relationship of the first average crotch height described in step 4, the first average crotch height H of the overflow brick is listed. 1 The equation is: Equation 7: Based on the similarity relationship of the second average crotch height described in step 4, the second average crotch height H of the overflow brick is listed. 2 The equation is:

7. A design method for high-strength and low-creep overflow bricks according to claim 6, It is characterized in that In step 7, the equivalent thickness of the reference overflow brick and the designed overflow brick is: The equivalent bottom height values ​​of the reference overflow brick and the designed overflow brick are: The equivalent heights of the reference overflow brick and the designed overflow brick are: d=d ′ ×(-1.718936×10 -5 ×(b×d ′ ×W×ρ y )+1.169457) d ref =d ′ ref ×(-1.718936×10 -5 ×(b ref ×d ′ ref ×W ref ×ρ y )+1.169457) Where, b is the equivalent thickness of the designed overflow brick; b ref is the equivalent thickness of the reference overflow brick; d ′ is the equivalent height bottom value of the overflow brick design; d ′ ref is the equivalent height bottom value of the reference overflow brick; d is the equivalent height of the designed overflow brick; d ref is the equivalent height of the reference overflow brick; ρ y is the density of overflow brick material.

8. A design method for high-strength and low-creep overflow bricks according to claim 7, It is characterized in that In step eight, the supporting surface length 1 of the overflow brick is designed to be:

9. A design method for high-strength and low-creep overflow bricks according to claim 7, It is characterized in that In step eight, the maximum cylinder pressure P of the clamping cylinder of the overflow brick is designed max for: P max =1.251×W×b×d×ρ y 。 10. A high strength and low creep overflow brick, It is characterized in that The invention is designed and manufactured based on the design method of a high-strength low-creep overflow brick described in any one of claims 1 to 9.

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