CN105705465A - Method for manufacturing glass plate, and device for manufacturing glass plate - Google Patents
Method for manufacturing glass plate, and device for manufacturing glass plate Download PDFInfo
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- CN105705465A CN105705465A CN201580000130.8A CN201580000130A CN105705465A CN 105705465 A CN105705465 A CN 105705465A CN 201580000130 A CN201580000130 A CN 201580000130A CN 105705465 A CN105705465 A CN 105705465A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
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Abstract
The invention provides a method for manufacturing glass plate, and a device for manufacturing glass plate. The method for manufacturing a glass plate by a downflow method, the method provided with a forming step for forming molten glass into a sheet-shaped glass plate, and an annealing step for annealing the glass sheet formed in the forming step using a plurality of heaters in an annealing space surrounded by furnace walls, the heaters for controlling the temperature in the annealing space, while conveying the glass sheet vertically downward. In the annealing step, the amount of retained head retained by the glass plate is determined together with the amount of heat in the annealing space using the amount of heat generated by the heaters, the distortion of the glass plate is determined on the basis of a pre-established relationship between the amount of retained heat and the distortion of the glass plate, and the amount of heat from the heaters is controlled, and the amount of retained heat in the glass plate is thereby corrected, and distortion of the glass plate is suppressed.
Description
Technical field
The present invention relates to the manufacture device of the manufacture method of the glass plate of a kind of warpage reducing glass plate and strain and glass plate。
Background technology
In the past, use utilized the glass tube down-drawing method to manufacture glass plate。In glass tube down-drawing, after making melten glass be flowed into formed body, make the top overflow from formed body of this melten glass。The melten glass of institute's overflow flows down along the two sides of formed body, and collaborates in the bottom of formed body, thus becomes the glass plate of lamellar。Then, glass plate is stretched downward by roller, and is cut into the length of regulation。
But, being stretched downward and being cut into period of length of regulation, glass plate thermal contraction, thus produce warpage and strain (residual stress)。This warpage and strain can cause display defect when glass plate is used as such as liquid crystal display (LCD) substrate。
In patent documentation 1, recite the thickness of slab for making glass plate as far as possible uniformly to reduce the manufacture method of the glass plate of warpage and strain。Specifically, recite the manufacture method of the glass plate of the cooling step including glass plate, this cooling step carries out the temperature controlling step of strain point of glass aspect, this temperature controlling step includes: the first temperature controlling step, the temperature making the end of the width of glass plate is lower than the temperature of the middle section being clipped between described end, and makes the temperature of described middle section become uniformly；Second temperature controlling step, makes the temperature of width of described glass plate from central part towards end step-down；And the 3rd temperature controlling step, in the temperature province near strain point of glass, make the end of the width of described glass plate be absent from thermograde with central part。
Background technology document
Patent documentation
Patent documentation 1: International Publication the 2012/133843rd
Summary of the invention
[problem that invention to solve]
There is such a case: the warpage of the glass plate using the manufacture method of the glass plate described in patent documentation 1 to obtain and strain can reduce than conventional method, but the strain of the glass plate obtained is not formed into required such。Therefore, present inventor carries out making great efforts inquire into and advance research, found that the reason as the required strain forming glass plate is not in that, the control accuracy by the temperature in the slow cooling space of glass plate slow cooling that strain with glass plate exists dependency relation is insufficient, and find to be controlled by heat produced by the heater of the temperature by control slow cooling space, warpage and the strain of glass plate can be reduced, thus completing the present invention。
[solving the technological means of problem]
The present invention comprises following form。
(form 1)
A kind of manufacture method of glass plate, it is characterised in that: it is the manufacture method of the glass plate utilizing glass tube down-drawing, and includes:
Forming step, moltens glass into the glass plate of lamellar；And
Slow cooling step, by glass plate formed thereby in described forming step towards in conveyance below vertical and the slow cooling space that surrounded by furnace wall, using multiple heaters that the temperature in described slow cooling space is controlled to carry out slow cooling；
In described cooling step, using the thermal discharge that described heater is released, the heat of possessing possessed by described glass plate is obtained in the lump with the space heat in described slow cooling space, and based on the described predetermined relationship possessing heat and the strain of described glass plate, obtain the strain of described glass plate, and
The heat of possessing of described glass plate is revised, thus suppressing the strain of described glass plate by controlling described heater heat。
(form 2)
The manufacture method of the glass plate according to form 1, it is characterised in that: described slow cooling space is divided into multiple space in described vertical, and in each space, uses multiple heater temperature to control in space, and
Based on the result of the strain gained obtaining described glass plate in described each space respectively, the heater heat that described heater is released is controlled。
(form 3)
The manufacture method of the glass plate according to form 1 or 2, it is characterised in that: the strain of described glass plate be simulated by thermal fluid analysis and viscoelastic model analysis mode and obtain。
(form 4)
The manufacture method of the glass plate according to form 3, wherein said slow cooling space is divided into multiple space in described vertical, and
In described thermal fluid analysis is simulated, when will go into each space in the plurality of space glass plate possess heat be set to glass plate enter time possess heat, and by providing the described thermal discharge possessing heat and described heater of glass plate during described entrance, and obtain described glass plate in each space in the plurality of space of described glass plate possess heat。
(form 5)
The manufacture method of the glass plate according to technical scheme 4, wherein said glass plate is when the plurality of spatial flow, the simulation of described thermal fluid analysis is to carry out in each space in the plurality of space, the space from the flow direction upstream side number of described glass plate after second segment in the plurality of space, possesses heat when Temperature Distribution when being flowed out by glass plate described in the space adjacent at upstream side is used as described entrance。
(form 6)
A kind of manufacture device of glass plate, it is characterised in that: being the manufacture device of the glass plate utilizing glass tube down-drawing, and include forming device, this forming device possesses:
Formed body, moltens glass into the glass plate of lamellar；
Slow cooling space, transports the glass plate shaped in described formed body below vertical, and is surrounded by furnace wall；And
Multiple heaters, control the temperature in described slow cooling space, and by described glass plate slow cooling；
Described forming device has:
Part I, use the thermal discharge that described heater is released, the heat of possessing possessed by described glass plate is obtained in the lump with the space heat in described slow cooling space, and based on the described predetermined relationship possessing heat and the strain of described glass plate, obtains the strain of described glass plate；And
Part II, revises the heat of possessing of described glass plate, thus suppressing the strain of described glass plate by controlling described heater heat。
[effect of invention]
In accordance with the invention it is possible to be controlled by heat produced by the heater of the temperature by control slow cooling space, and reduce warpage and the strain of glass plate。
Accompanying drawing explanation
Fig. 1 is the partial process view of the manufacture method of the glass plate of present embodiment。
Fig. 2 is the figure manufacturing the fusing device that device comprises of the glass plate that the manufacture method of the glass plate mainly representing present embodiment uses。
Fig. 3 is the diagrammatic elevational view of forming device。
Fig. 4 is the summary side elevation of forming device。
Fig. 5 is the control block diagram controlling device。
Fig. 6 is the partial enlarged drawing of the diagrammatic elevational view of forming device。
Fig. 7 is the outline sectional elevation of forming device。
Fig. 8 is the sectional view on the A line of Fig. 7。
Fig. 9 indicates that the figure of a segment model in the slow cooling space in present embodiment。
Figure 10 indicates that the figure of common glass temperature and the relation of specific heat。
Figure 11 indicates that the stress of glass plate relaxes the figure of parameter。
Figure 12 indicates that the figure of the structure Relaxation parameter of glass plate。
Detailed description of the invention
Hereinafter, with reference to accompanying drawing, while the manufacture method that the manufacture device using glass plate manufactures the glass plate of the present embodiment of glass plate illustrates。
(1) summary of the manufacture method of glass plate
Fig. 1 is the partial process view of the manufacture method of the glass plate of present embodiment。
Hereinafter, use Fig. 1 that the manufacture method of glass plate is illustrated。
As it is shown in figure 1, glass plate is through comprising melting step ST1, clarification steps ST2, homogenization step ST3, forming step ST4, cooling step ST5 and cutting off the various steps of step ST6 and manufacture。Hereinafter, these steps are illustrated。
In melting step ST1, frit is heated and is melted。Frit such as comprises SiO2、Al2O3Deng composition。Frit after melting becomes melten glass。
In clarification steps ST2, melten glass is clarified。Specifically, the gas componant comprised in melten glass is discharged from melten glass, or the gas componant comprised in melten glass is absorbed in melten glass。
In homogenization step ST3, melten glass is homogenized。It addition, in this step, clarified melten glass is carried out temperature adjustment。
In forming step ST4, glass tube down-drawing (such as, overflow downdraw) is utilized to molten glass into the glass plate of lamellar。
In cooling step ST5, form the cooling of glass plate formed thereby in step ST4。In this cooling step ST5, glass plate is cooled to the temperature close to room temperature。
In cutting off step ST6, the glass plate having been cooled to the temperature close to room temperature is cut off by every specific length and is made glass plate。
It addition, cut off further after this by the glass plate that every specific length is cut-off, and carry out grinding/grinding, clean, check and become glass plate, thus for flat faced displays such as liquid crystal displays。
(2) summary manufacturing device 100 of glass plate
Fig. 2 is the schematic diagram manufacturing the fusing device 200 that device 100 comprises mainly representing glass plate。Fig. 3 is the diagrammatic elevational view manufacturing the forming device 300 that device 100 comprises of glass plate。Fig. 4 is the summary side elevation of forming device 300。Hereinafter, the manufacture device 100 of glass plate is illustrated。
The manufacture device 100 of glass plate mainly has fusing device 200 (with reference to Fig. 2), forming device 300 (with reference to Fig. 3～Fig. 4) and shearing device 400 (not shown)。
(2-1) composition of fusing device 200
Fusing device 200 is used to the device carrying out melting step ST1, clarification steps ST2 and homogenization step ST3。
As in figure 2 it is shown, fusing device 200 has melting groove 201, defecator 202, agitator tank the 203, first pipe arrangement 204 and the second pipe arrangement 205。
Melt the groove that groove 201 is used to melt frit。In melting groove 201, carry out melting step ST1。
Defecator 202 is used to from melting the groove removing bubble in the melten glass melted groove 201。The melten glass sent into from melting groove 201 is heated by defecator 202 further, thus the froth breaking of the bubble in promotion melten glass。In defecator 202, carry out clarification steps ST2。
Agitator tank 203 has agitating device, and this agitating device comprises the collecting container of melten glass, rotating shaft and is arranged on the stirring vane of this rotating shaft。As container, rotating shaft and stirring vane, for instance the container of alloy of the platinum family elements such as platinum or platinum family element, rotating shaft and stirring vane can be used, but be not limited to this。Making rotating shaft rotate by the driving of the drive divisions such as motor (not shown), thus, melten glass is stirred by the stirring vane being arranged on rotating shaft。In agitator tank 203, carry out homogenization step ST3。
First pipe arrangement 204 and the second pipe arrangement 205 are the pipe arrangements of the alloy such as comprising platinum family element or platinum family element。First pipe arrangement 204 is the pipe arrangement being connected with agitator tank 203 by defecator 202。Second pipe arrangement 205 is the pipe arrangement being connected with forming device 300 by agitator tank 203。
(2-2) composition of forming device 300
Forming device 300 is used to the device forming step ST4 and cooling step ST5。
As shown in Figures 3 and 4, forming device 300 has formed body 310, air-flow barrier component 320, chill roll 330, cooling unit 340, draw roll 350a～350e and heater 360a～360e。Hereinafter, these compositions are illustrated。
(2-2-1) formed body 310
Formed body 310 is used to form the device of step ST4。
As it is shown on figure 3, formed body 310 is positioned at the upper section of forming device 300, and there is following function, i.e. utilize overflow downdraw that the melten glass flowed from fusing device 200 is configured to the glass plate SG of lamellar。It is wedge-type shape that formed body 310 cuts off the cross sectional shape of gained in the vertical direction, and formed body 3120 is such as made up of refractory brick。
As shown in Figure 4, at formed body 310, at the upstream side of the path direction of the melten glass come from fusing device 200 stream, it is formed for mouth 311。And, as shown in Figure 4, at formed body 310, it is formed with the groove 312 of opening upward along its length direction。Groove 312 is to be formed in the way of gradually becoming shallower as towards downstream along with the upstream side from the path direction of melten glass。
Flow the melten glass come from fusing device 200 towards forming device 300 and flow the groove 312 of formed body 310 via supply mouth 311。
Stream arrives the melten glass top overflow at this groove 312 of the groove 312 of formed body 310, and the two sides 313 along formed body 310 flow down。Then, the melten glass flowed down along the two sides 313 of formed body 310 collaborates in the bottom 314 of formed body 310 and becomes glass plate SG。
(2-2-2) air-flow barrier component 320, heat insulating member 41
As shown in Figures 3 and 4, air-flow barrier component 320 is disposed on the parts of the tabular near the bottom 314 of formed body 310。
Air-flow barrier component 320 is the both sides of the thickness direction being substantially horizontally arranged in the glass plate SG that the bottom 314 from formed body 310 flows down。Air-flow barrier component 320 is function as heat insulation material。That is, air-flow barrier component 320 suppresses heat to move to downside from the upside of air-flow barrier component 320 by being separated by the air that it is upper and lower。As shown in Figures 3 and 4, forming device 300 has the space immediately below than the space of air-flow barrier component 320 more top and formed body resettlement section 410, air-flow barrier component 320 and the space below formation zone 42a and formation zone 42a and slow cooling district 420。Slow cooling district 420 has multiple slow cooling space 42b, 42c ..., 42f。Formation zone 42a, slow cooling space 42b～42f successively from vertical above towards lower section lamination。Forming formation zone 42a, slow cooling district 420 (slow cooling space 42b～42f) by being surrounded by furnace wall, glass plate SG is mobile at this formation zone 42a and slow cooling district 420 (slow cooling space 42b～42f)。
Heat insulating member 41 is the heat insulation material of the tabular of the thickness direction both sides being arranged in the lower section of following chill roll 330 and glass plate SG in slow cooling district 420。Heat insulating member 41 is by forming formation zone 42a and slow cooling space 42b～42f by separating than air-flow barrier component 320 space further below。Such as, as shown in Figure 4, heat insulating member 41 forms formation zone 42a and slow cooling space 42b。And, heat insulating member 41 forms slow cooling space 42b and slow cooling space 42c。So, by being surrounded by furnace wall and heat insulating member 41 and form slow cooling space 42b～42f。Each heat insulating member 41 suppresses the heat between upper and lower space mobile。Such as, heat insulating member 41 suppresses the heat between formation zone 42a and slow cooling space 42b mobile, and, heat insulating member 41 suppresses the heat between slow cooling space 42b and slow cooling space 42c mobile。
(2-2-3) chill roll 330
Chill roll 330 is arranged in the lower section of air-flow barrier component 320。And, chill roll 330 is arranged in the both sides of the thickness direction of glass plate SG, and by with the two end portions of the width of glass plate SG to in the way of configure。Chill roll 330 is that the utilization air cooled tube at internal run-through is to carry out air cooling。Thus, glass plate SG is when by chill roll 330, the two side portions of the thickness direction of the glass plate SG contacted with through air cooled chill roll 330 and the two end portions (following, this part is called ear R, L of glass plate SG) of its width are cooled。Thus, the viscosity making this ear R, L becomes setting (such as, 109.0Pool) more than。Herein, ear R, L refer to that the thickness of slab of the middle section (central part) of the width of the glass plate SG clipped relative to ear R, L is thicker, having the part of specific thickness, described middle section (central part) can be used as the substantially uniform part of thickness of product (glass substrate)。Chill roll 330 also has the effect that the driving force driving motor 390 (with reference to Fig. 5) by transmitting chill roll, is stretched downward by glass plate SG。By chill roll 330, glass plate SG is drawn into the thickness of regulation。
(2-2-4) cooling unit 340
Cooling unit 340 is such as air-cooled type chiller, chill roll 330 and the ambient temperature of glass plate SG thereunder passed through is cooled down。And, cooling unit 340 is configured with multiple (such as, 3) at the width of glass plate SG, and is configured with multiple at its flow direction。Specifically, cooling unit 340 by with the surface of ear R, L of glass plate SG to in the way of configure one by one, and by with the surface of middle section to in the way of be configured with 1。
(2-2-5) draw roll 350a～350e
Draw roll 350a～350e is that the flow direction along glass plate SG configures with separating predetermined distance in the lower section of chill roll 330。And, draw roll 350a～350e is arranged respectively at the both sides of the thickness direction of glass plate SG, and by with the two end portions of the width of glass plate SG to in the way of be arranged in slow cooling space 42b～42f。And, draw roll 350a～350e reaches the two side portions of thickness direction of the glass plate SG of more than setting with the viscosity of ear R, L in chill roll 330 and the two end portions of its width contacts, while being stretched downward by this glass plate SG。It addition, draw roll 350a～350e drives the driving force of motor 391 (with reference to Fig. 5) to be driven by transmitting draw roll。The circular velocity of draw roll 350a～350e is more than the circular velocity of chill roll 330。The circular velocity of draw roll becomes big along with the downstream of flow direction being arranged in glass plate SG。That is, in multiple draw roll 350a～350e, the circular velocity of draw roll 350a is minimum, and the circular velocity of draw roll 350e is maximum。
(2-2-6) heater (temperature control unit)
As it is shown on figure 3, heater (temperature control unit) 360a～360e is arranged respectively at the formation zone 42a below cooling unit 340 and slow cooling space 42b～42f, the ambient temperature of formation zone 42a and slow cooling space 42b, 42c ... is controlled。Heater 360a～360e is as following chiller function, namely, by utilizing following control device 500 to control output, and the ambient temperature near roller 350a～350e glass plate SG drawn downward that is stretched is controlled (specifically, making ambient temperature increase)。And, as shown in FIG. 6 and 7, each heater 360a～360e has and configures the heat unit 361a of multiple (such as, 3,6 etc.), 362a ..., 366a in the width direction。Heat unit 361a～366a is the radiator body that heat is discharged into slow cooling space。Heat unit 361a～366a is to embed furnace wall and to be endowed electric power respectively and constituted in the way of heat release。As shown in Figure 6, heat unit 361a～366a along the width of glass plate SG, with the both sides of glass plate SG in the face of to position be arranged in string。Fig. 6 has illustrated the heat unit 361a～366a being arranged on slow cooling space 42b, heater 360b～the 360e with same heat unit is that the ambient temperature near glass plate SG is configured in the way of the Temperature Distribution (hereinafter referred to as " temperature profile ") of the width formation regulation of glass plate SG。Consequently, it is possible to the ambient temperature of formation zone 42a and slow cooling space 42b～42f is controlled by each heater 360a～360e with heat unit。Additionally, the heat unit of each heater 360a～360e can also be set to following composition, i.e. be not configured with multiple only with respect to the width of glass plate SG, and the flow direction relative to glass plate SG is also configured with multiple。
Herein, the ambient temperature of roller 350a～350e glass plate SG drawn downward of being stretched is carried out temperature control (specifically by heater 360a～360e (heat unit 361a～366a), by controlling the ambient temperature of glass plate SG, glass plate SG is carried out temperature control), thus, glass plate SG carries out elapsing from adhesive region through Viscoelastic Region the cooling of Hookean region。
And, near heat unit 361a～366a, configure the thermocouple unit 380 (with reference to Fig. 5～Fig. 7) of the ambient temperature in each region detecting glass plate SG。The ambient temperature of slow cooling space 42b～42f that the heat release because of heat unit 361a～366a is changed by thermocouple unit 380 is measured。Control device 500 and obtain the ambient temperature measured by thermocouple unit 380, and based on acquired ambient temperature, the thermal discharge from heater 360a～360e heat unit 361a～366a possessed is controlled。At bottom 314 area below and the formation zone 42a and slow cooling space 42b～42f of formed body 310, utilizing chill roll 330, cooling unit 340, heater 360a～360e (heat unit 361a～366a) is cooling step ST5 by the glass plate SG step cooled down。
(2-3) shearing device 400
In shearing device 400, carry out cutting off step ST6。Shearing device 400 is the device cut off in the direction vertical from the length face relative to this glass plate SG for glass plate SG flowed down in forming device 300。Thus, the glass plate SG of lamellar becomes multiple glass plate SG with specific length。Shearing device 400 is to be driven motor 392 (with reference to Fig. 5) to be driven by shearing device。
(3) device 500 is controlled
Fig. 5 is the control block diagram controlling device 500。
Control device 500 and comprise CPU (CentralProcessingUnit, central processing unit), ROM (Read-OnlyMemory, read only memory), RAM (Random-AccessMemory, random access memory), hard disk etc., and as glass plate manufactured the control portion and function that the various machines that device 100 comprises are controlled。
Specifically, the manufacture device 100 of glass plate or forming device 300 possess control device 500, as shown in Figure 5, what this control device 500 received glass plate manufactures the various sensors that comprise of device 100 (such as, thermocouple unit 380 etc.) or switch is (such as, main power switch 381 etc.) etc. signal, from the input instruction that operating personnel inputs via input equipment (not shown) etc., and carry out cooling unit 340, heater 360a～360e (heat unit 361a～366a), the chill roll that the action of chill roll 330 is controlled drives motor 390, the draw roll that the action of draw roll 350a～350e is controlled drives motor 391, the shearing device that the action of shearing device 400 is controlled drives the control of motor 392 grade。
(4) temperature in cooling step ST5 controls
Cooling step ST5 includes controlling device 500 and controls the temperature of glass plate SG by chill roll 330 is controlled。And then, cooling step ST5 includes glass plate SG is carried out temperature controlled temperature controlling step。Specifically, in temperature controlling step, heat unit 361a～366a that cooling unit 340 and heater 360a～360e are had is controlled and carries out the control of the ambient temperature of glass plate SG, thus the temperature of glass plate SG is controlled。
And, cooling step ST5 includes the heat rate-determining steps that the thermal discharge of heat unit 361a～366a is controlled, the temperature making glass plate SG enters, at the height and position (the slow cooling space of regulation) of regulation, the temperature range specified, and makes the temperature of glass plate SG have the Temperature Distribution of regulation on the width of this glass plate SG。That is, the temperature of glass plate SG is controlled on the flow direction and width of this glass plate SG。
For described heat rate-determining steps, it is described hereinafter for the action of heat unit 361a～～366a。In heat rate-determining steps, determine heat produced by heat unit 361a～366a。
Below to determining that the order of heat produced by heat unit 361a～366a illustrates。I) heat unit 361a～366a is initially set the design temperature of regulation by control portion 500, and in slow cooling space 42b～42f (slow cooling district 420), make the ambient temperature near glass plate SG form, at the width of glass plate SG, the temperature profile (temperatureprofile) specified。
Ii) the glass plate SG ambient temperature possessed in heat (temperature of glass plate SG), slow cooling space 42b～42f (slow cooling district 420) possessed is obtained。
Iii) based on described ii) in ambient temperature in the calculated temperature of glass plate SG, slow cooling space 42b～42f, obtain the Temperature Distribution of glass plate SG, the stress distribution that are formed, and in the way of reducing calculated strain, heat (design temperature) produced by heat unit 361a～366a is controlled。
Below the method obtaining the Temperature Distribution of glass plate SG in order to heat (design temperature of heat unit 361a～366a) produced by heat unit 361a～366a is controlled is illustrated。The method uses thermal fluid analysis simulation and viscoelasticity analysis simulation。
< thermal fluid analysis simulation >
In thermal fluid analysis is simulated, for instance use the discrete model based on Finite element method to carry out thermal fluid analysis。In thermal fluid analysis, provide heater heat produced by heat unit 361a～366a, namely the design temperature of radiator body 361a～366a is provided, and the Temperature Distribution of atmosphere of slow cooling space 42b～42f and the Temperature Distribution of glass plate SG are set to unknown number, and obtain glass plate SG in slow cooling space universe (slow cooling district) possess heat and Temperature Distribution。Simulation is to implement under the following conditions。
1. model
One section of slow cooling space 42b in the multistage be separated into the flow direction at glass plate SG in slow cooling district 420 is discrete as grid model, and uses thermal fluid analysis to obtain the Temperature Distribution of the glass plate SG in first paragraph slow cooling space 42b。The Temperature Distribution of the glass plate SG now entering into slow cooling space 42b is predefined。And, by the Temperature Distribution of the glass plate SG in first paragraph slow cooling space 42b from slow cooling space 42b flow out time width Temperature Distribution be defined as the Temperature Distribution of the glass plate SG entering into second segment slow cooling space 42c。So, use the Temperature Distribution of glass plate SG when entering into each section of slow cooling space and obtain the Temperature Distribution of glass plate in each slow cooling space。So the Temperature Distribution of the glass plate SG in the universe of slow cooling space is simulated。
Fig. 9 represents from the flow direction of glass plate SG to be seen as the model of first paragraph slow cooling space 42b。Provide the heater heat (design temperature) possessing heat, heater 360a (heat unit 361a～366a) of glass plate SG when entering into slow cooling space 42b, and the Temperature Distribution of the glass plate SG in first paragraph slow cooling space 42b is obtained in the lump with the ambient temperature in the 42b of slow cooling space。And, at ratio in the slow cooling space after the second segment of first paragraph further downstream, the Temperature Distribution of glass plate SG is obtained in the same manner as first paragraph, and the Temperature Distribution of calculated multiple glass plate SG is connected together, thus obtain the Temperature Distribution of the glass plate SG of slow cooling space 42b～42f overall (slow cooling district 420)。
Consider the impact of the ambient temperature possessed in heat, the heater heat (design temperature) of (2) heater 360a (heat unit 361a～366a), (3) slow cooling space 42b of glass plate SG when (1) enters into slow cooling space 42b, the Temperature Distribution of the glass plate SG in first paragraph slow cooling space 42b is analyzed。For described (1)～(3), illustrate as described below。
(1) when entering into slow cooling space 42b, glass plate SG's possesses heat
The heat (Temperature Distribution) of possessing of glass plate SG is to use the temperature sensor (not shown) being arranged on the glass plate SG position (upstream side of slow cooling space 42b) entering slow cooling space 42b to be measured。Because the amount of melten glass flowed out from formed body 310 is fixed, so the flow of glass plate SG (conveyance speed) is fixed, that can obtain glass plate SG when entering into slow cooling space 42b according to measured temperature (Temperature Distribution) possesses heat。Moreover, it is also possible to the temperature according to the flow of glass plate SG, the melten glass flowing into formed body 310, that obtains glass plate SG when entering into slow cooling space 42b possesses heat (Temperature Distribution)。
(2) thermal discharge (design temperature) of heater 360a (heat unit 361a～366a)
The thermal discharge of each heat unit 361a～366a changes according to the design temperature controlled set by device 500。It is obtain according to supply unit the measurement result of the kilowatt meter (not shown) of heat unit 361a～366a that sets based on each heat unit 361a～366a of the design temperature heater heat released。Therefore, when the thermal discharge of heat unit 361a～366a is controlled, the electric power given to each heat unit 361a～366a is controlled。Herein, the design temperature that heat unit 361a～366a that the heater 360a of slow cooling space 42b is had initially sets is set to such as 700 DEG C。The thermal discharge of radiator body 361a～366a can be all identical, it is also possible to gives distribution to thermal discharge。And, the temperature initially set 700 DEG C is to illustrate, and therefore the temperature of heat unit 361a～366a can also obtain with the form of result of calculation as unknown quantity。The inflow temperature of glass plate SG can also be set to such as 700 DEG C and be calculated, and by observed temperature reach with the temperature of result of calculation good consistent in the way of set the inflow temperature of glass plate SG。Average current (A) voltage (V) power factor of heat unit 361a～366a that institute's temperature sets is measured practically, thus obtains thermal discharge (W), and be scaled heat release density (W/m3) using as design conditions。Temperature is to obtain with the form of result of calculation (solution), therefore can by result of calculation and design temperature are compared, and by reach good consistent in the way of repeatedly revise condition and obtain。
(3) ambient temperature in the 42b of slow cooling space
According to the glass plate SG heater heat possessing heat and heat unit 361a～366a possessed, the ambient temperature in the 42b of slow cooling space changes。Ambient temperature in the 42b of slow cooling space is by the atmosphere of slow cooling space 42b is assumed to incompressible ideal gas, and the heat transmission caused by the free convection caused by buoyancy and this free convection is included in and solves with coupling in the thermal fluid analysis model identical with the heat transmission of glass plate SG。Additionally, in the present embodiment, ambient temperature in the 42b of slow cooling space is solved as the unknown number in thermal fluid analysis, can also replace, by thermocouple unit 380, the ambient temperature in the 42b of slow cooling space is measured, obtain the heat (ambient temperature in the 42b of slow cooling space) kept in the 42b of slow cooling space, and this heat is provided as the ambient temperature in the slow cooling space 42b in thermal fluid analysis, thus calculating the Temperature Distribution of glass plate SG。
2. physics value
Physics value about the material constituting glass plate SG and slow cooling space 42b is as described below。
A. glass plate SG
I) density: 2500 [kg/m3]。
Ii) thermal conductivity: 1.1278 [W/mK]。
Iii) specific heat: as shown in Figure 10。
B. draw roll 350a～350e (rustless steel SUS304)
Ii) thermal conductivity: 16.0 [W/mK] (27 DEG C), 25.7 [W/mK] (727 DEG C)。
C. air-flow barrier component 320, heat insulating member 41, furnace wall (heat insulation material)
I) thermal conductivity: 0.04～0.3 [W/mK]。
3. design conditions
Owing to calculating (calculating of time indeclinable system) for stable state, so using the algorithm of thermal fluid analysis。Flowing is set to stable, uses SIMPLE algorithm, the flowing of fluid, convective heat transfer, radiant heat transfer three is coupled, and use single solver to solve。For solver, it is possible to use commercially available software, it is possible to use known interchangeable heat fluid analysis software。Herein, in thermal fluid analysis, computationally glass plate SG is processed as fluid because the translational speed of glass plate SG is consistent with conveyance speed and it is known that so that the flow velocity of glass plate SG region entirety is fixed and is calculated。And, air assumes that as incompressible ideal gas, and the heat transmission caused by free convection is comprised in the calculation。
It is analyzed by conditions above transitivity value is input to interchangeable heat fluid analysis software, it is possible to obtain the Temperature Distribution of glass plate SG in first paragraph slow cooling space 42b。
It follows that the Temperature Distribution of the glass plate SG obtained in slow cooling space 42c～42f that second segment is later。About slow cooling space 42c～42f that second segment is later, also make discrete grid model in the same manner as the 42b of slow cooling space。Specifically, in grid model, the heat of possessing of the glass plate SG being flowed into slow cooling space 42c～42f is to use to possess heat (Temperature Distribution) as glass plate SG when flowing out from the preceding paragraph slow cooling space calculated by the result of thermal fluid analysis。Namely, such as, for entering into the heat of possessing of the glass plate SG of second segment slow cooling space 42c, use as the glass plate SG having obtained temperature (Temperature Distribution) in first paragraph slow cooling space 42b calculated by the result of thermal fluid analysis from first paragraph slow cooling space 42b flow out time glass plate SG possess heat。
And, the design temperature being arranged on the heat unit 361a～366a of second segment slow cooling space 42c is set to the～temperature of 30 DEG C lower 5 DEG C than the preceding paragraph, it is preferably set to the temperature of low 15 DEG C, one section is often advanced towards flow direction, design temperature is set to the temperature reduced with the scope of 5 DEG C～30 DEG C, it is preferable that be set to reduce the temperature of 15 DEG C every time。
Condition for being obtained the Temperature Distribution of the glass plate SG universe in slow cooling space 42c～42f that second segment is later by thermal fluid analysis is identical with the condition transitivity value that the Temperature Distribution of the glass plate SG in first paragraph slow cooling space 42b uses, so omitting the description。
So, in thermal fluid analysis is simulated, by enter multiple slow cooling spaces each time glass plate possess heat be set to glass plate enter time possess heat, the thermal discharge possessing heat and heater of glass plate when providing entrance, thus can obtain glass plate multiple cooling spaces each central glass plate possess heat。Now, thermal fluid analysis simulation is to carry out in the middle of each of multiple cooling spaces, and the upstream side of the flow direction from glass plate in multiple cooling spaces is seen as the cooling space after second segment, it is possible to by glass plate from the cooling space adjacent at upstream side flow out time Temperature Distribution be used as to possess heat when entering。
Thus, the Temperature Distribution of glass plate SG in each section of slow cooling space is obtained by thermal fluid analysis, and by connecting together multiple for the Temperature Distribution of the glass plate SG in each section of slow cooling space, it is possible to obtain the Temperature Distribution of the glass plate SG in multistage slow cooling space 42c～42f universe (slow cooling district 420)。
< viscoelasticity analysis simulation >
Use the glass plate SG's in the slow cooling space 42b～42f universe (slow cooling district 420) obtained by described thermal fluid analysis to possess heat (Temperature Distribution), obtained the stress distribution of glass plate SG by viscoelastic model analysis。
Specifically, the Temperature Distribution of the glass plate SG in the slow cooling space 42b～42f universe obtained by described thermal fluid analysis, the physics value of described glass plate SG and the stress mitigation parameter of glass plate SG and structure Relaxation parameter are input to known analysis software and are analyzed, thus carry out viscoelastic model analysis, obtain the stress distribution of glass plate。Specifically, it is considered to stress relax parameter, structure Relaxation parameter and obtain stress distribution。In slow cooling space 42b～42f, sometimes cool down when the temperature of glass plate SG is uneven in the direction of the width, be constantly be generated thermal stress because shrinking difference, and stress constantly relaxes。Therefore, in order to evaluate the residual stress remaining in glass plate SG, not only need to carry out calculating based on the thermal stress shunk, and need to consider that the stress that stress reduces in time relaxes。Therefore, by using the viscoelastic model of structure analysis software to consider that stress relaxes。And, in order to obtain structure Relaxation parameter, it is also contemplated that because of the contraction that structural relaxation causes。Contraction (thermalexpansion) that the contraction of glass plate SG has the volume caused because of thermal expansion to reduce along with temperature and reduces, thermal contraction (compaction) as the contraction caused because of structural relaxation。Owing to when at high temperature being placed for a long time by glass plate SG, volume can reduce, so it is set to structure Relaxation parameter。By the test experiment for structural relaxation parameter, cycle-index is structure Relaxation parameter of harmonizing in the way of meeting repeatedly heat treated contraction result。
Result according to viscoelasticity analysis, the Temperature Distribution of glass plate and the strain of glass plate have dependency relation, therefore can obtain this dependency relation in advance, and based on this dependency relation, obtain the stress distribution of glass plate SG according to the temperature (Temperature Distribution) of glass plate SG。The described stress mitigation parameter of glass plate SG and described structure Relaxation parameter are shown in Figure 11 and Figure 12 as the mensuration in by experiment。
According to case above, it is possible to use thermal fluid analysis and viscoelastic model analysis and obtain the stress distribution of glass plate SG。
The stress distribution of the glass plate SG utilizing described method and obtain is that the thermal discharge according to the original state that the design temperature of heat unit 361a～366a is set to 700 DEG C is obtained, by making the design temperature of heat unit 361a～366a change, the stress distribution of glass plate SG also changes。The relation of change with the strain variation of glass plate SG owing to being obtained the design temperature of heat unit 361a～366a by use thermal fluid analysis and viscoelastic model analysis, therefore, it is possible to by the design temperature controlling heat unit 361a～366a in the way of suppressing the stress distribution of glass plate SG, with this warpage reducing glass plate SG and strain。
Alternatively, it is also possible to device for measurement of strain (strain measurement sensor) is arranged on slow cooling space 42b～42f and the warpage of glass plate SG and strain, Temperature Distribution is measured。Strain measurement and temperature measuring (thermocouple) are different mensuration but it also may in identical place, both are measured。
And, glass plate SG possesses heat (Temperature Distribution) and can also clamp because of the roller 350a～350e that is stretched and change。Now, thermocouple unit 380 or the heat (Temperature Distribution) of possessing that utilizes draw roll 350a～350e heat detection sensor possessed that draw roll 350a～350e is possessed is utilized to be measured。By using both the heats of possessing possessing heat and glass plate SG of draw roll 350a～350e to be simulated, it is also possible to obtain the warpage of glass plate SG and strain。
Specifically, when carrying out the simulation of described thermal fluid analysis, the model in each slow cooling space can also be added the grid model of top draw-off godets 350a～350e, determine according to described measurement result draw roll 350a～350e grid model possess heat, and solve the ambient temperature in slow cooling space and the Temperature Distribution of glass plate SG by giving design temperature to heat unit。Thus, the Temperature Distribution of glass plate SG can be obtained more accurately。
Above, the manufacture method of glass plate and the manufacture device of glass plate to the present invention have been described in detail, and certainly, the present invention is not limited to described embodiment, it is also possible to carry out various improvement or change without departing from the spirit and scope of the invention。
[explanation of symbol]
The manufacture device of 100 glass plates
310 formed bodies
The bottom of 313 formed bodies
330 chill rolls (roller)
350a～350e draw roll (roller)
360a～360e heater
361a～366a heat unit
420 slow cooling districts
42a formation zone
42b～42f slow cooling space
SG glass plate
Claims (6)
1. the manufacture method of a glass plate, it is characterised in that: it is the manufacture method of the glass plate utilizing glass tube down-drawing, and includes:
Forming step, moltens glass into the glass plate of lamellar；And
Slow cooling step, by glass plate formed thereby in described forming step towards in conveyance below vertical and the slow cooling space that surrounded by furnace wall, using multiple heaters that the temperature in described slow cooling space is controlled to carry out slow cooling；
In described cooling step, use the thermal discharge that described heater is released, the heat of possessing possessed by described glass plate is obtained in the lump with the space heat in described slow cooling space, and the strain of described glass plate is obtained based on the predetermined relationship of the described strain possessing heat and described glass plate, and
The heat of possessing of described glass plate is revised, thus suppressing the strain of described glass plate by described heater heat is controlled。
2. the manufacture method of glass plate according to claim 1, it is characterised in that:
Described slow cooling space is divided in described vertical multiple space, and uses multiple heater that the temperature in space is controlled in each space, and
Based on the result of the strain gained obtaining described glass plate in described each space respectively, the heater heat that described heater is released is controlled。
3. the manufacture method of glass plate according to claim 1 and 2, it is characterised in that:
The strain of described glass plate be simulated by thermal fluid analysis and viscoelastic model analysis mode and obtain。
4. the manufacture method of glass plate according to claim 3, wherein
Described slow cooling space is divided into multiple space in described vertical,
In described thermal fluid analysis is simulated, when will go into each space in the plurality of space glass plate possess heat be set to glass plate enter time possess heat, and by providing the described thermal discharge possessing heat and described heater of glass plate during described entrance, and obtain described glass plate in each space in the plurality of space of described glass plate possess heat。
5. the manufacture method of glass plate according to claim 4, wherein said glass plate is when the plurality of spatial flow, the simulation of described thermal fluid analysis is to carry out in each space in the plurality of space, and the upstream side from the flow direction of described glass plate in the plurality of space is seen as the space after second segment, when Temperature Distribution when being flowed out by glass plate described in the space adjacent at upstream side is used as described entrance, possess heat。
6. the manufacture device of a glass plate, it is characterised in that: being the manufacture device of the glass plate utilizing glass tube down-drawing, and include forming device, this forming device possesses:
Formed body, moltens glass into the glass plate of lamellar；
Slow cooling space, transports glass plate formed thereby in described formed body below vertical, and is surrounded by furnace wall；And
Multiple heaters, are controlled the temperature in described slow cooling space, and by described glass plate slow cooling；
Described forming device has:
Part I, use the thermal discharge that described heater is released, the heat of possessing possessed by described glass plate is obtained in the lump with the space heat in described slow cooling space, and based on the described predetermined relationship possessing heat and the strain of described glass plate, obtains the strain of described glass plate；And
Part II, revises the heat of possessing of described glass plate, thus suppressing the strain of described glass plate by described heater heat is controlled。
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| JP2014-093275 | 2014-04-30 | ||
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| PCT/JP2015/062918 WO2015166972A1 (en) | 2014-04-30 | 2015-04-30 | Method for manufacturing glass plate, and device for manufacturing glass plate |
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| CN105705465B CN105705465B (en) | 2018-09-11 |
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| JP (1) | JP5937759B2 (en) |
| KR (1) | KR101798305B1 (en) |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001007372A1 (en) * | 1999-07-22 | 2001-02-01 | Nh Techno Glass Corporation | Production method and device for sheet glass, and liquid crystal device |
| WO2011047008A1 (en) * | 2009-10-14 | 2011-04-21 | Corning Incorporated | Method and apparatus for controlling sheet thickness |
| CN102596828A (en) * | 2010-09-30 | 2012-07-18 | 安瀚视特股份有限公司 | Glass sheet manufacturing method |
| CN103253848A (en) * | 2011-06-30 | 2013-08-21 | 安瀚视特控股株式会社 | Glass plate manufacturing method and glass plate manufacturing device |
| CN103359913A (en) * | 2012-04-06 | 2013-10-23 | 安瀚视特控股株式会社 | Making method of glass substrate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2008036227A1 (en) * | 2006-09-20 | 2008-03-27 | Corning Incorporated | Temperature compensation for shape-induced in-plane stresses in glass substrates |
| CN103183462B (en) | 2011-03-31 | 2016-01-20 | 安瀚视特控股株式会社 | The manufacture method of sheet glass |
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- 2015-04-30 WO PCT/JP2015/062918 patent/WO2015166972A1/en active Application Filing
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001007372A1 (en) * | 1999-07-22 | 2001-02-01 | Nh Techno Glass Corporation | Production method and device for sheet glass, and liquid crystal device |
| WO2011047008A1 (en) * | 2009-10-14 | 2011-04-21 | Corning Incorporated | Method and apparatus for controlling sheet thickness |
| CN102596828A (en) * | 2010-09-30 | 2012-07-18 | 安瀚视特股份有限公司 | Glass sheet manufacturing method |
| CN103253848A (en) * | 2011-06-30 | 2013-08-21 | 安瀚视特控股株式会社 | Glass plate manufacturing method and glass plate manufacturing device |
| CN103359913A (en) * | 2012-04-06 | 2013-10-23 | 安瀚视特控股株式会社 | Making method of glass substrate |
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| TW201545998A (en) | 2015-12-16 |
| JP5937759B2 (en) | 2016-06-22 |
| JPWO2015166972A1 (en) | 2017-04-20 |
| WO2015166972A1 (en) | 2015-11-05 |
| TWI592373B (en) | 2017-07-21 |
| CN105705465B (en) | 2018-09-11 |
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| KR101798305B1 (en) | 2017-11-15 |
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