CN110698043A - Glass sheet forming apparatus and method - Google Patents

Glass sheet forming apparatus and method Download PDF

Info

Publication number
CN110698043A
CN110698043A CN201911148997.4A CN201911148997A CN110698043A CN 110698043 A CN110698043 A CN 110698043A CN 201911148997 A CN201911148997 A CN 201911148997A CN 110698043 A CN110698043 A CN 110698043A
Authority
CN
China
Prior art keywords
glass
distributor
width
flow
distributor box
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201911148997.4A
Other languages
Chinese (zh)
Other versions
CN110698043B (en
Inventor
卢世峯
王乃帅
王培新
粟勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CDGM Glass Co Ltd
Chengdu Guangming Optoelectronics Co Ltd
Original Assignee
Chengdu Guangming Optoelectronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chengdu Guangming Optoelectronics Co Ltd filed Critical Chengdu Guangming Optoelectronics Co Ltd
Priority to CN201911148997.4A priority Critical patent/CN110698043B/en
Publication of CN110698043A publication Critical patent/CN110698043A/en
Application granted granted Critical
Publication of CN110698043B publication Critical patent/CN110698043B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • C03B17/061—Forming glass sheets by lateral drawing or extrusion

Abstract

The invention belongs to the technical field of glass plate manufacturing, and particularly discloses a glass plate forming device and method with low manufacturing cost and good quality of formed glass plates. The glass sheet forming apparatus includes a supply pipe, a flow cross distributor, and a lip block. The flow transverse distributor and the lip brick main bodies are both formed by simple geometric structures, so that the glass plate forming device is relatively simple in structure, small in manufacturing difficulty and low in manufacturing cost; moreover, through the distributor box body of the flow transverse distributor, the glass liquid flowing out of the flow transverse distributor can be uniformly distributed along the horizontal direction, the thickness of the glass liquid is ensured to be uniform, meanwhile, the glass liquid flowing out of a horizontal flow outlet can be continuously flattened on a flattening overflow surface of the glass liquid through the lip brick, a surface with good characteristics is formed under the action of the surface tension of the glass liquid, the thickness of the glass liquid film is more uniform, and the glass plate with excellent surface quality and smaller thickness deviation is formed.

Description

Glass sheet forming apparatus and method
Technical Field
The invention belongs to the technical field of glass plate manufacturing, and particularly relates to a glass plate forming device and method.
Background
With the increasing progress and innovation of technology, the demand for high quality optical and electronic glass plates is generated in more and more occasions, such as: special optical glass sheets, optical filters, TFT glass substrates, glass cover plates, wafer substrates and the like. The method meets the requirements of various high-quality glass plate products, and is suitable for the requirements of small glass flow and glass plate forming technologies of various glass grades. In addition, secondary surface cold working has been required to reduce or even disallow the high quality glass sheets required for certain applications.
To achieve high quality surface and thickness uniformity in the formed glass sheet, the best forming technique currently recognized is the overflow downdraw process followed by the slot downdraw process.
The overflow down-draw method is a method that molten glass liquid is conveyed into a forming device with a wedge-shaped cross section shape through a discharge pipe, overflows from two sides of a groove of the forming device, passes through the top of the forming device, then flows down along two side wall surfaces of the forming device, is fused together at a position where the two side wall surfaces at the bottom of the forming device are intersected to form a glass ribbon, and finally forms a glass plate; the glass liquid can form good surface characteristics under the action of surface tension in the overflow process, so that the glass plate with excellent surface quality and small thickness deviation is formed. However, the overflow forming device required by the overflow down-draw method has high manufacturing cost due to expensive material, high precision requirement and large processing difficulty of the overflow structure, and the general use of the TFT overflow forming tank can offset the manufacturing cost for 1.5-2 years, so that the overflow forming device is not suitable for forming multiple glass varieties.
The slit down-draw method is a method in which molten glass is fed through a discharge pipe to a forming apparatus having a long-hole-shaped slit at the bottom, the molten glass flows out from the long-hole-shaped slit at the bottom of the forming apparatus to form a glass ribbon, and the glass ribbon is cooled and formed into a glass sheet through a feed path. Although the slit forming device adopted by the slit down-draw method has relatively simple structure, low manufacturing difficulty and relatively low manufacturing cost, the surface quality of the formed glass plate is inferior to that of the glass plate formed by the overflow down-draw method.
Disclosure of Invention
The invention aims to provide a glass plate forming device which has low manufacturing cost and good quality of formed glass plates.
The technical scheme adopted by the invention for solving the technical problems is as follows: the glass plate forming device comprises a feeding pipe, a flow transverse distributor and a lip brick; the flow transverse distributor comprises a distributor box body with a feed inlet and a horizontal outflow port, the distributor box body comprises an inclined bottom surface, the horizontal outflow port is positioned at the inclined upper end of the bottom surface, and the width of the distributor box body is gradually increased from front to back along the liquid spraying direction of the horizontal outflow port; the feeding pipe is arranged on the upper side of the flow transverse distributor and corresponds to a feeding hole of the distributor box body; the lip brick is provided with an inclined flattening overflow surface, and the inclined upper end of the flattening overflow surface is arranged corresponding to the nozzle of the horizontal outflow port.
Further, the dispenser box further comprises an inclined top surface, and the inclination of the top surface is smaller than that of the bottom surface.
Further, the distributor box has an overall average hydraulic diameter
Figure BDA0002283015480000021
The following formula is satisfied:
Figure BDA0002283015480000022
Figure BDA0002283015480000024
wherein L isTThe length of the dispenser box; l is an integral variable; dhIs the hydraulic diameter at different positions along the length direction of the distributor box body; wOThe minimum value of the width of the distributor box body; weMaximum value of the width of the distributor box, also indicated as the width of the horizontal outflow opening or the width of the levelling overflow; zOThe maximum height of the distributor box body; zeIs the highest height of the distributor box bodyThe small value, which is also expressed as the height of the horizontal outflow opening.
Further, the nozzle height Z of the horizontal flow outleteThe following formula is satisfied:
Ze≥δ；
Figure BDA0002283015480000025
wherein, delta is a calculated value of the thickness of the glass liquid film on the flattening overflow surface; eta is the viscosity of the glass liquid on the flattening overflow surface; q is the flow of the molten glass; rho is the glass density; g is the acceleration of gravity;
Figure BDA0002283015480000026
to flatten the inclination angle of the overflow surface.
Further, still include the attenuate ware, the attenuate ware sets up the both sides of the slope lower extreme of shakeout the overflow surface.
Further, the forming device also comprises a forming control roller which is arranged at the lower side of the thinner; controlling the linear velocity V of the forming control roll according to the following formularA step (2);
Figure BDA0002283015480000027
wherein HnAnd WnThe thickness and the width of the glass liquid film respectively leave the thinning device; hdAnd WdThe thickness and the width of the glass liquid film when contacting the forming control roller are respectively; ω is the angular velocity of the forming control roll; r is the radius of the forming control roll; q is the flow of the molten glass; ρ is the glass density.
Furthermore, the top parts of the distributor box body and the horizontal flow outlet are both open; the overall average hydraulic diameter of the distributor box
Figure BDA0002283015480000031
The following formula is satisfied:
Figure BDA0002283015480000032
Figure BDA0002283015480000033
Figure BDA0002283015480000034
wherein L isTThe length of the dispenser box; l is an integral variable; dhIs the hydraulic diameter at different positions along the length direction of the distributor box body; wOThe minimum value of the width of the distributor box body; weMaximum value of the width of the distributor box, also indicated as the width of the horizontal outflow opening or the width of the levelling overflow; zOThe maximum height of the distributor box body; zeIs the minimum height of the distributor box, which is also indicated as the height of the horizontal outflow opening.
The device further comprises a thick plate forming groove, the thick plate forming groove comprises a bottom die and side dies arranged on two sides of the bottom die in the width direction, and the feeding end of the bottom die is connected with the inclined lower end of the flattening overflow surface.
The invention also provides a glass plate forming method with better forming quality, which adopts a glass plate forming device comprising a feed pipe, a flow transverse distributor, a lip block, a thinning device and a forming control roller to manufacture a thin glass plate with the thickness of 0.05-2 mm, and adopts a glass plate forming device comprising a feed pipe, a flow transverse distributor, a lip block and a thick plate forming groove to manufacture a thick glass plate with the thickness of more than 2 mm.
Further, the method comprises controlling the pressure difference h (D) required for achieving the corresponding glass melt flow rate Q in the flow cross distributor according to the following formulah) A step (2);
wherein eta is the viscosity of the glass liquid in the flow transverse distributor; q is the flow of the molten glass; rho is the glass density; g is the acceleration of gravity.
The invention has the beneficial effects that: the glass plate forming device mainly comprises a feeding pipe, a flow transverse distributor and a lip brick, wherein the feeding pipe is an existing part, and the flow transverse distributor and the lip brick are respectively composed of a simple geometric structure, so that the glass plate forming device is relatively simple in structure, small in manufacturing difficulty and low in manufacturing cost; and, through having the distributor box that slope bottom surface and bottom surface slope upper end are equipped with the horizontal outflow, can make the horizontal evenly distributed in the edge of the glass liquid that flows out in the horizontal distributor of follow flow, guarantee that glass liquid thickness is even, simultaneously through setting up the lip brick that has the shakeout overflow face of slope, can make the glass liquid of the horizontal outflow export of flowing can last shakeout on shakeout the overflow face, and form the surface that has good characteristic under the glass liquid surface tension effect, and make glass liquid film thickness more even, thereby the glass board that the shaping surface quality is excellent and the thickness deviation is less.
Drawings
FIG. 1 is a schematic three-dimensional structure of one embodiment of the present invention;
FIG. 2 is a schematic side view of the embodiment of FIG. 1;
FIG. 3 is a schematic illustration of a calculation of the hydraulic diameter of the internal flow field of the flow cross distributor in the embodiment of FIG. 1;
FIG. 4 is a schematic three-dimensional structure of another embodiment of the present invention;
FIG. 5 is a side view schematic of the embodiment of FIG. 4;
FIG. 6 is a schematic illustration of a hydraulic diameter calculation of the internal flow field of the flow cross distributor of the embodiment of FIG. 4;
labeled as: a feed pipe 100, a flow transverse distributor 200, a distributor box 210, a horizontal outflow port 211, a bottom surface 212, a top surface 213, a lip tile 300, a leveling overflow surface 310, an auxiliary heating element 320, a thinner 400, a forming control roller 500, a drawing roller 600, a glass sheet 700, a thick plate forming groove 800, a bottom die 810, and a side die 820;
the direction of the arrows in fig. 3 and 6 indicates the flow of molten glass.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, 2, 4 and 5, the glass sheet forming apparatus includes a supply pipe 100, a flow cross distributor 200 and a lip 300; the flow rate transverse distributor 200 comprises a distributor box body 210 with a feed inlet and a horizontal flow outlet 211, the distributor box body 210 comprises an inclined bottom surface 212, the horizontal flow outlet 211 is positioned at the inclined upper end of the bottom surface 212, and the width of the distributor box body 210 is gradually increased from front to back along the liquid spraying direction of the horizontal flow outlet 211; the feeding pipe 100 is arranged at the upper side of the flow transverse distributor 200 and corresponds to the feeding port of the distributor box 210; the lip brick 300 is provided with an inclined leveling overflow surface 310, and the inclined upper end of the leveling overflow surface 310 is arranged corresponding to the spout of the horizontal outflow port 211.
The feed pipe 100 is mainly used for connecting with a smelting device and supplying molten glass to the flow transverse distributor 200, and the feed pipe can be vertically arranged or obliquely arranged on the upper side of the flow transverse distributor 200; feed tube 100 is typically made of a platinum group noble metal material, such as: ruthenium, rhodium, palladium, osmium, iridium, platinum, and the like, preferably made of platinum-gold material.
The flow transverse distributor 200 is mainly used for horizontally and transversely and uniformly distributing the flow of the molten glass, and the main body of the flow transverse distributor is a distributor box body 210; the distributor box 210 with the inclined bottom surface 212 is beneficial to storing the molten glass and reducing the intermediate flow rate of the molten glass on one hand, and can guide and preliminarily form the molten glass on the other hand; the purpose of positioning the horizontal outflow port 211 at the inclined upper end of the bottom surface 212 is to further alleviate the flow rate maldistribution of the molten glass in the lateral direction; meanwhile, since the width of the dispenser housing 210 is gradually increased from the front to the rear in the direction of the liquid ejected from the horizontal outflow port 211, the glass liquid flowing into the flow rate lateral distributor 200 from the supply pipe 100 gradually flattens toward the horizontal outflow port 211, and finally flows out of the glass liquid formed into a ribbon shape from the horizontal outflow port 211. Generally, the slope of the bottom surface 212 is proportional to the viscosity of the glass liquid, i.e., the slope increases with increasing viscosity of the glass liquid.
Generally, the width of the distributor box 210 is a deformed pipeline type box which is gradually increased along the liquid spraying direction of the horizontal outlet 211, the height of the distributor box is a deformed pipeline type box which is gradually decreased along the liquid spraying direction of the horizontal outlet 211, and the cross section of the distributor box is regular shape, preferably rectangular; distributor box 210 can be made of a variety of materials, and if direct heating is used, distributor box 210 is typically made of a platinum group precious metal material, preferably a platinum material; if indirect heating is used, the distributor box 210 is typically made of a non-metallic material that is refractory and corrosion resistant, preferably erosion resistant bricks. In order to maintain the fluidity of the molten glass in the distributor box 210, the flow rate transverse distributor 200 further comprises a heating device for heating the molten glass in the distributor box 210; the heating means may be of various kinds, for example: heating rods, heating wires, etc.
The glass sheet forming apparatus is classified into a closed type and an open type according to whether the top of the distributor box 210 of the flow cross distributor 200 is open or not. The closed glass plate forming device is mainly used for manufacturing a thin glass plate 700 with the thickness of 0.05-2 mm; the thin glass sheet 700 is formed by providing a constant and constant pulling force by gravity. The open glass plate forming apparatus is mainly used for manufacturing a thick glass plate 700 having a thickness of more than 2mm, and the thick glass plate 700 is formed by stacking thick glass plates having a target thickness in a thick plate forming tank 800 while blocking a downward drawing force.
The glass plate forming device provided by the invention is suitable for manufacturing glass plates with small glass flow and multiple brands; when the glass forming temperature is 1100 ℃ or lower, the open glass sheet forming apparatus is preferred; when the glass forming temperature is 1100 ℃ or higher, a closed glass sheet forming apparatus is preferred. The open flow cross distributor 200 is typically made of platinum and is heated directly to its bottom and sides; the open top of the flow cross distributor 200 is typically heated with the aid of a carbon rod to ensure a uniform temperature of the glass liquid therein. The closed flow cross distributor 200 is typically made of platinum and is heated directly around it; the heating ends are arranged on the periphery of the flow transverse distributor 200, so that the temperature of the glass liquid in the flow transverse distributor 200 can be ensured to be uniform. The temperature boundaries described above are merely intended to illustrate that the higher the temperature of the formed glass, the preference for the closed flow cross distributor 200; if the glass melt is highly corrosive to volatilization, the closed flow rate horizontal distributor 200 is used without distinction in the level of the forming temperature.
Preferably, and as shown in connection with fig. 1 and 2, the enclosed glass sheet forming apparatus includes a flow cross distributor 200 having a distributor box 210 further including an inclined top surface 213, the top surface 213 having an inclination less than the inclination of the bottom surface 212. The top surface 213 of the structure can better guide and shape the molten glass to further improve the effect of horizontal and uniform distribution of the molten glass.
Since the distributor box 210 is a deformed pipe type box with a regular cross section, the calculation can be performed by using viscous circular pipe flow in fluid mechanics, and the transverse dimension of the distributor box can be determined by using a hydraulic diameter method; as shown in connection with FIG. 3, to effectively control the flow of molten glass in the closed flow cross distributor 200, the overall average hydraulic diameter of the distributor box 210 is typically made
Figure BDA0002283015480000061
The following formula is satisfied:
Figure BDA0002283015480000062
wherein L isTThe length of dispenser housing 210; l is an integral variable; dhIs along the length of the dispenser housing 210Hydraulic diameters at different positions in the direction of degrees; wOThe minimum value of the width of dispenser box 210; weIs the maximum value of the width of the dispenser box 210, which is also indicated as the width of the horizontal outflow opening 211 or the width of the flattened overflow surface 310; zOThe maximum height of the dispenser housing 210; zeIs the minimum height of the dispenser housing 210, which is also indicated as the height of the horizontal outflow opening 211.
In addition to the above, as shown in fig. 1 and 3, in order to further reduce the flow rate distribution unevenness of the molten glass in the lateral direction, the nozzle height Z of the horizontal flow outlet 211 is set to be lowereThe smaller the size, the better; but also the quality of the upper surface of the formed glass plate is ensured in order to avoid the phenomenon that the nozzle of the horizontal flow outlet 211 is stained with the glass liquid, and the height Z of the nozzle of the horizontal flow outlet 211eThe thickness delta of the glass liquid film on the flattening overflow surface 310 of the lip brick 300 is not less than; specifically, the spout height Z of the horizontal flow outlet 211eThe following formula is satisfied:
Ze≥δ；
Figure BDA0002283015480000065
wherein, δ is a calculated value of the thickness of the glass liquid film on the flattening overflow surface 310; η is the viscosity of the glass liquid on the flattening overflow surface 310; q is the flow of the molten glass; rho is the glass density; g is the acceleration of gravity;
Figure BDA0002283015480000066
to flatten the angle of inclination of the overflow surface 310.
Referring to fig. 1 and 2, the enclosed glass sheet forming apparatus, which includes a lip block 300, generally made of a refractory material, is mainly used to continuously flatten a glass liquid film on a flattening overflow surface 310 to obtain good surface characteristics and a uniform thickness. The sloping upper end of the flattened overflow surface 310 is typically in smooth transition with the horizontal outflow opening 211. The lip tile 300 also needs to heat the glass liquid on the lip tile; generally, a platinum group precious metal layer can be arranged on the flattening overflow surface 310 by adopting a coating, electroplating or attaching mode, and the like, and is directly heated by a heating device; an auxiliary heating element 320 corresponding to the leveling overflow surface 310 can be further provided on the lip tile 300 as shown in fig. 1 and 2, wherein the auxiliary heating element 320 is a radiation heating element; the radiant heat emitted by the auxiliary heating element 320 is used for heating the glass liquid film on the flattening overflow surface 310 and fire polishing the surface of the glass liquid film to form a nearly perfect glass liquid surface; to achieve uniform heating and fire polishing, the auxiliary heating elements 320 are generally disposed along the width of the flattened overflow surface 310; preferably, the number of the auxiliary heating elements 320 is at least two, and the auxiliary heating elements are distributed at intervals along the inclined direction of the leveling overflow surface 310; the auxiliary heating element 320 may be various, for example: radiant heating tubes, silicon carbide rods, and the like.
Flattening the slope angle of the flood plane 310
Figure BDA0002283015480000071
In general in the range of
Figure BDA0002283015480000072
According to the calculation formula of the thickness of the glass liquid film on the leveling overflow surface 310, the inclination angle of the leveling overflow surface 310 can be knownThe larger the thickness delta of the glass liquid film on the flattening overflow surface 310, the smaller the thickness delta, so that the glass sheet is drawnThe larger the size, the better, but in general, the maximum limit should not be taken; at the same time, the user can select the desired position,the value of (b) is also related to the viscosity eta of the glass liquid on the flattening overflow surface 310, and the time for fire polishing is longer as the viscosity of the glass liquid is higher, namely, the glass liquid viscosity is higher
Figure BDA0002283015480000076
A higher value is to be taken and it is therefore necessary to increase the residence time of the glass liquid on the flattening overflow 310. For giving consideration to glass sheetsThickness and surface quality, flattening the angle of inclination of the flood plane 310
Figure BDA0002283015480000077
Preferably in a range of values
Figure BDA0002283015480000078
Specifically, as shown in fig. 1 and 2 again, the enclosed glass sheet forming apparatus further includes thinners 400, the thinners 400 being disposed on both sides of the inclined lower end of the flattening overflow surface 310. The thinner 400 is used to prevent the glass film from shrinking sharply in the width direction after leaving the lip 300, and simultaneously, the glass liquid flows downward through the thinner 400 in the same width, thereby reducing the thickness of the glass sheet formed before and securing the width of the glass sheet formed. The thinner 400 is generally made of a platinum group noble metal material or a hard refractory material, and is generally installed and connected to both side edges of the inclined lower end of the leveling flood plane 310. The length L of the thinner 400 in the moving direction of the glass liquid filmsThe following formula is satisfied:
Figure BDA0002283015480000079
wherein C (m, ρ, W) is a function of glass mass flow rate, molten glass density, and the width of the flattening overflow surface 310; rho is the glass density; m is the mass flow rate of the glass liquid; g is the acceleration of gravity; eta is the viscosity of the glass liquid; hiδ is the initial thickness of the glass liquid film entering the attenuator 400, HnThe thickness of the glass liquid film exiting the reducer 400.
As a preferable aspect of the present invention, as further shown in fig. 1 and 2, the enclosed glass sheet forming apparatus further includes a forming control roll 500, and the forming control roll 500 is provided on the lower side of the thinner 400. The form control roller 500 is generally made of a ceramic or heat-resistant metal material, the surface of which is subjected to a finishing treatment; by adjusting the position and the rotation speed of the forming control roll 500, the width and the thickness of the glass sheet forming can be further controlled. The forming control roller 500 is generally rotatably installed by a position adjusting device, and the position of the forming control roller 500 can be adjusted up, down, front and back by the position adjusting device; the position adjustment can be various, for example: the device comprises a device consisting of a vertical telescopic cylinder and a front and rear telescopic cylinder, a device consisting of a front and rear slide rail, an upper and lower slide rail arranged on the front and rear slide rail in a sliding way, and a connecting slide block arranged on the upper and lower slide rail in a sliding way, and the like; the position and the rotation speed of the forming control roll 500 are generally driven by a servo driver controlled by a PLC controller. The forming control roll 500 generally has a cooling process adjusting function such as water cooling or air cooling.
Since the region of the molten glass below the thinner 400 and above the forming control rolls 500 is the forming zone of the glass sheet, the glass in this zone is influenced by the combination of the parameters of gravity, surface tension, viscosity, and cooling forming process, and the length L of this zonefGenerally, the method is determined according to the viscosity, the surface tension characteristic, the cooling forming process and other factors of the glass brand; the following formula can be derived by combining the knowledge of fluid mechanics and the One-Dimensional thinning theory mentioned in "A One-Dimensional Model of striking Float Glass" (O.S. Narasassawamy) in the process of thinning, wherein the width of the Glass sheet shrinks at the same time, and the following formula can be derived;
Figure BDA0002283015480000081
linear velocity V of forming control roller 500rThe requirements are as follows:
Figure BDA0002283015480000082
wherein HnAnd WnThe thickness and width of the glass liquid film as it leaves the thinner 400, respectively; hdAnd WdThe thickness and width of the glass liquid film when contacting the forming control roll 500; ω is the angular velocity of the forming control roller 500; r is the radius of the forming control roll 500; q is the flow of the molten glass; ρ is the glass density.
On the basis of the above, the upper, lower, front and rear positions of the forming control roll 500 are generally controlled according to the viscosity of the glass grade, the surface tension characteristics, the cooling forming process thereof and other factors, so as to realize the adjustment of the forming area of the glass sheet.
Preferably, the glass sheet forming apparatus described above further includes a drawing roll 600, and the drawing roll 600 is disposed on the rear side in the drawing direction of the forming control roll 500. The pulling roll 600 can move back and forth along the pulling direction; the formed glass plate can be effectively drawn through the traction effect of the traction roller 600, and the production efficiency is improved.
Preferably, and as shown in connection with FIGS. 4 and 5, the open glass sheet forming apparatus includes a flow cross distributor 200 having both the distributor box 210 and the horizontal flow outlet 211 open at the top; as shown in connection with FIG. 6, to effectively control the flow of molten glass in the open flow cross distributor 200, the overall average hydraulic diameter of the distributor box 210 is typically made
Figure BDA0002283015480000095
The following formula is satisfied:
Figure BDA0002283015480000091
Figure BDA0002283015480000092
wherein L isTThe length of dispenser housing 210; l is an integral variable; dhAre hydraulic diameters at various locations along the length of the distributor box 210; wOThe minimum value of the width of dispenser box 210; weIs the maximum value of the width of the dispenser box 210, which is also indicated as the width of the horizontal outflow opening 211 or the width of the flattened overflow surface 310; zOThe maximum height of the dispenser housing 210; zeIs the minimum height of the dispenser housing 210, which is also indicated as the height of the horizontal outflow opening 211.
As a preferred embodiment of the present invention, as shown in fig. 4 and 5, the open glass sheet forming apparatus further includes a thick sheet forming bath 800, the thick sheet forming bath 800 includes a bottom mold 810 and side molds 820 disposed at both sides in a width direction of the bottom mold 810, and a feeding end of the bottom mold 810 is connected to an inclined lower end of the leveling overflow surface 310. The lip brick 300 does not have any flattening function when the thick glass plate 700 is formed in a stacking mode, and the lip brick 300 only has the function of eliminating a flowing dead zone in the stacking and forming process; the height of the lip 300 should be greater than the thickness of the formed glass sheet, but should not be too great. The thick plate forming groove 800 is a place where the forming and stacking action of the thick glass plate 700 occurs, the thick plate forming groove 800 is usually made of high-temperature resistant steel, a cooling mechanism is arranged in the thick plate forming groove 800, and the cooling purpose is mainly to cool and shape the glass plate as soon as possible and also prevent glass liquid from sticking to the thick plate forming groove 800.
Preferably, the glass sheet forming apparatus further comprises a drawing roll 600, and the drawing roll 600 is disposed at the discharge end of the thick sheet forming bath 800. The pulling roll 600 can move back and forth along the pulling direction; the glass sheet 700 can be effectively drawn and formed by the drawing action of the drawing rolls 600, and the production efficiency is improved. The linear speed of the pulling rolls 600 is preferably controlled to draw the thick glass sheet 700 according to the following formula;
Figure BDA0002283015480000094
wherein H and W are the thickness and width of the glass liquid film when contacting the thick plate forming groove 800, respectively; ω is the angular velocity of the pull roll 600; r is the radius of the pull roll 600; q is the flow of the molten glass; ρ is the glass density.
The present invention also provides a glass plate forming method for manufacturing a thin glass plate 700 having a thickness of 0.05 to 2mm by using a closed glass plate forming apparatus having a top surface 213 of a distributor box 210, and a thick glass plate having a thickness of more than 2mm by using an open glass plate forming apparatus having an open top of the distributor box 210.
Preferably, the glass sheet forming method includes controlling the pressure difference h (D) required to achieve the corresponding molten glass flow rate Q in the flow cross distributor 200 according to the following formulah) A step (2);
wherein η is the viscosity of the glass liquid in the flow cross distributor 200; q is the flow of the molten glass; rho is the glass density; g is the acceleration of gravity.
Example 1
The enclosed glass sheet forming apparatus provided by the invention was experimentally verified by physical simulation experiments. Under the condition that the working condition is stable, namely the simulated liquid flow, the control stick rotating speed and the like are kept stable, 12 different positions are respectively selected for the upper part, the middle part and the lower part of the flattening overflow surface 310 of the lip brick 300, the thickness of the simulated liquid film is measured, each position is measured for multiple times, the average value is obtained, and the test data and the statistical analysis data are shown in table 1.
Table 1: statistical results of simulated liquid-liquid film thicknesses at different positions on leveling overflow surface 310 of lip brick 300
Position of Maximum value Minimum value Mean value of Deviation from design value
Upper part 2.47mm 2.31mm 2.38mm -3.61％
Middle part 2.45mm 2.32mm 2.39mm -2.90％
Lower part 2.41mm 2.33mm 2.37mm -4.22％
From the above data, it can be seen that the average thickness of the simulated liquid film at different positions on the flattening overflow surface 310 of the lip brick 300 is substantially the same; 12 measuring points, wherein the deviation at the upper part of the leveling overflow surface 310 is the largest and is-2.98% -3.75%, the deviation at the lower part of the leveling overflow surface 310 is the smallest and is-1.51% -1.87%, and the lip brick 300 has a certain leveling function on the simulation liquid; the average thickness of the simulated liquid-liquid film at different positions on the leveling overflow surface 310 is 2.38mm, which is smaller than the designed value of 2.47mm by 3.61%, and various reasons for error are provided, for example: the liquid level height at the inlet, the actual viscosity of the simulated liquid, the actual pulling speed of the shaping control roller 500 on the simulated liquid film, measurement errors, and the like.
It can be seen from the experiment that the thickness of the glass liquid film is more uniform by the horizontal and uniform distribution of the glass liquid by the flow horizontal distributor 200 and the flattening effect of the lip brick 300, so that the glass plate 700 with very small thickness deviation can be formed and manufactured, and the control pressure difference h (D) of the calculation formula of the thickness of the glass liquid film on the flattening overflow surface 310 is verifiedh) So as to ensure the stable practicability of the glass liquid flow Q.
Example 2
The open glass plate forming device provided by the invention is adopted to manufacture the glass plate 700 with the specification of 800mm width and 20mm thickness, and a thermal state test is carried out for verification. Under the condition of stable working conditions, namely under the condition that the glass flow, the rotating speed of a traction roller (kept at 32mm/min) and the like are kept stable, after passing through an annealing furnace, the actually cut thick glass plate is randomly subjected to cold state measurement, the thickness of the plate in the width direction is respectively selected from 20 different positions along the width direction of the plate, the thickness of the plate is measured, each position is measured for multiple times, the average value is obtained, and the test statistical analysis data are shown in a table 2.
Table 2: statistical result of random thickness measurement of thick glass plate
Maximum value Minimum value Mean value of Deviation from design value
20.33mm 19.72mm 20.025mm 0.125％
From the above data, it can be seen that the above cold test results in relatively small errors, because the glass has solidified into a sheet and the measurement errors are greatly reduced when measured in the cold state, and another advantage is that the drawing speed is relatively slow during the stacking process, so that the molten glass has time to continuously adjust and flatten in the thick sheet forming trough 800.
The thickness of the glass plate 700 is basically consistent with 20 measuring points; it can be seen that the thick glass sheet 700 having very small thickness deviation can be formed and manufactured by the horizontal and horizontal uniform distribution of the molten glass by the flow rate distributor 200 and the stacking of the thick sheet forming groove 800, and the calculation formula is verified again in the controlPressure difference h (D)h) So as to ensure the stable practicability of the glass liquid flow Q.

Claims (10)

1. Glass sheet forming apparatus comprising a supply tube (100), characterized in that: also comprises a flow transverse distributor (200) and a lip brick (300); the flow rate transverse distributor (200) comprises a distributor box body (210) with a feed inlet and a horizontal outflow opening (211), the distributor box body (210) comprises an inclined bottom surface (212), the horizontal outflow opening (211) is positioned at the inclined upper end of the bottom surface (212), and the width of the distributor box body (210) is gradually increased from front to back according to the liquid spraying direction of the horizontal outflow opening (211); the feeding pipe (100) is arranged on the upper side of the flow transverse distributor (200) and corresponds to a feeding hole of the distributor box body (210); the lip brick (300) is provided with an inclined flattening overflow surface (310), and the inclined upper end of the flattening overflow surface (310) is arranged corresponding to the nozzle of the horizontal outflow opening (211).
2. A glass sheet forming apparatus as in claim 1 wherein: the dispenser box (210) further comprises an inclined top surface (213), the inclination of the top surface (213) being smaller than the inclination of the bottom surface (212).
3. A glass sheet forming apparatus as in claim 2 wherein: the overall average hydraulic diameter of the distributor box (210)
Figure FDA0002283015470000011
The following formula is satisfied:
Figure FDA0002283015470000012
Figure FDA0002283015470000013
Figure FDA0002283015470000014
wherein L isTIs the length of the dispenser housing (210); l is an integral variable; dhAre hydraulic diameters at different locations along the length of the distributor box (210); wOIs the minimum value of the width of the distributor box body (210); weIs the maximum value of the width of the distributor box (210), which is also indicated as the width of the horizontal outflow opening (211) or the width of the flattening overflow surface (310); zOIs the maximum height of the dispenser box (210); zeIs the minimum height of the distributor box (210), which is also indicated as the height of the horizontal outflow opening (211).
4. A glass sheet forming apparatus as claimed in claim 2 or 3, wherein: a spout height Z of the horizontal outflow opening (211)eThe following formula is satisfied:
Ze≥δ；
Figure FDA0002283015470000015
wherein, delta is a calculated value of the thickness of the glass liquid film on the flattening overflow surface (310); eta is the viscosity of the glass liquid on the flattening overflow surface (310); q is the flow of the molten glass; rho is the glass density; g is the acceleration of gravity;
Figure FDA0002283015470000021
to flatten the angle of inclination of the overflow surface (310).
5. A glass sheet forming apparatus as in claim 1, 2 or 3 wherein: still include attenuate ware (400), attenuate ware (400) set up the both sides at the slope lower extreme of shakeout overflow face (310).
6. A glass sheet forming apparatus as in claim 5 wherein: the forming device further comprises a forming control roller (500), wherein the forming control roller (500) is arranged on the lower side of the thinner (400); controlling the linear velocity V of the forming control roll (500) according to the following formular；
Figure FDA0002283015470000022
Figure FDA0002283015470000023
Wherein HnAnd WnThe thickness and the width of the glass liquid film respectively leave the thinning device (400); hdAnd WdThe thickness and the width of the glass liquid film are respectively when the glass liquid film contacts the forming control roller (500); omega is the angular speed of the forming control roller (500); r is the radius of the forming control roller (500); q is the flow of the molten glass; ρ is the glass density.
7. A glass sheet forming apparatus as in claim 1 wherein: the top parts of the distributor box body (210) and the horizontal flow outlet (211) are both open; the overall average hydraulic diameter of the distributor box (210)
Figure FDA0002283015470000024
The following formula is satisfied:
Figure FDA0002283015470000025
wherein L isTIs the length of the dispenser housing (210); l is an integral variable; dhAre hydraulic diameters at different locations along the length of the distributor box (210); wOIs the minimum value of the width of the distributor box body (210); weIs the maximum width of the dispenser housing (210), which is also indicated as the width of the horizontal outflow opening (211) or the spreading overflow surface (310)) The width of (d); zOIs the maximum height of the dispenser box (210); zeIs the minimum height of the distributor box (210), which is also indicated as the height of the horizontal outflow opening (211).
8. A glass sheet forming apparatus as in claim 1, 2, 3 or 7 wherein: the device is characterized by further comprising a thick plate forming groove (800), wherein the thick plate forming groove (800) comprises a bottom die (810) and side dies (820) arranged on two sides of the bottom die (810) in the width direction, and the feeding end of the bottom die (810) is connected with the inclined lower end of the flattening overflow surface (310).
9. A method for forming a glass sheet, characterized by: a thin glass plate (700) having a thickness of 0.05 to 2mm is manufactured by using the glass plate forming apparatus according to claim 6, and a thick glass plate (700) having a thickness of more than 2mm is manufactured by using the glass plate forming apparatus according to claim 8.
10. A method of forming glass sheets as in claim 9 wherein: comprising controlling the pressure difference h (D) required to reach the corresponding glass melt flow rate Q in the flow rate cross distributor (200) according to the following formulah) A step (2);
Figure FDA0002283015470000031
wherein eta is the viscosity of the glass liquid in the flow transverse distributor (200); q is the flow of the molten glass; rho is the glass density; g is the acceleration of gravity.
CN201911148997.4A 2019-11-21 2019-11-21 Glass sheet forming apparatus and method Active CN110698043B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911148997.4A CN110698043B (en) 2019-11-21 2019-11-21 Glass sheet forming apparatus and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911148997.4A CN110698043B (en) 2019-11-21 2019-11-21 Glass sheet forming apparatus and method

Publications (2)

Publication Number Publication Date
CN110698043A true CN110698043A (en) 2020-01-17
CN110698043B CN110698043B (en) 2022-03-15

Family

ID=69207674

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911148997.4A Active CN110698043B (en) 2019-11-21 2019-11-21 Glass sheet forming apparatus and method

Country Status (1)

Country Link
CN (1) CN110698043B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113233739A (en) * 2021-04-30 2021-08-10 彩虹显示器件股份有限公司 Substrate glass and manufacturing method
CN113429117A (en) * 2021-08-11 2021-09-24 江西鼎盛新材料科技有限公司 Forming device and forming method of microcrystalline glass
CN115215533A (en) * 2022-07-26 2022-10-21 凯盛君恒药玻(青岛)有限公司 Glass melting furnace with overflow device
CN115784576A (en) * 2022-11-30 2023-03-14 湖南旗滨微晶新材料有限公司 Spreading forming equipment, production equipment and spreading forming process for special glass

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002265229A (en) * 2001-03-09 2002-09-18 Hoya Corp Manufacturing method for glass sheet, manufacturing method for blank for press forming, and manufacturing method for optical component
CN102471119A (en) * 2009-07-09 2012-05-23 旭硝子株式会社 Plate glass manufacturing device and plate glass manufacturing method
CN103922567A (en) * 2014-04-01 2014-07-16 成都光明光电股份有限公司 Device for manufacturing glass plate
CN104230148A (en) * 2013-06-07 2014-12-24 富荞企业管理顾问有限公司 Composite type glass molding system
CN105417935A (en) * 2015-12-10 2016-03-23 成都光明光电股份有限公司 Glass plate forming device and forming method thereof
CN105593176A (en) * 2013-09-30 2016-05-18 康宁股份有限公司 Apparatus and method for forming the outer layers of a glass laminate sheet
CN108238710A (en) * 2018-03-09 2018-07-03 汪立新 Glass tape polishes manufacturing process and glass substrate production method and production equipment
CN108328909A (en) * 2018-04-25 2018-07-27 中国建材国际工程集团有限公司 Glass production device and its production technology

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002265229A (en) * 2001-03-09 2002-09-18 Hoya Corp Manufacturing method for glass sheet, manufacturing method for blank for press forming, and manufacturing method for optical component
CN102471119A (en) * 2009-07-09 2012-05-23 旭硝子株式会社 Plate glass manufacturing device and plate glass manufacturing method
CN104230148A (en) * 2013-06-07 2014-12-24 富荞企业管理顾问有限公司 Composite type glass molding system
CN105593176A (en) * 2013-09-30 2016-05-18 康宁股份有限公司 Apparatus and method for forming the outer layers of a glass laminate sheet
CN103922567A (en) * 2014-04-01 2014-07-16 成都光明光电股份有限公司 Device for manufacturing glass plate
CN105417935A (en) * 2015-12-10 2016-03-23 成都光明光电股份有限公司 Glass plate forming device and forming method thereof
CN108238710A (en) * 2018-03-09 2018-07-03 汪立新 Glass tape polishes manufacturing process and glass substrate production method and production equipment
CN108328909A (en) * 2018-04-25 2018-07-27 中国建材国际工程集团有限公司 Glass production device and its production technology

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113233739A (en) * 2021-04-30 2021-08-10 彩虹显示器件股份有限公司 Substrate glass and manufacturing method
CN113233739B (en) * 2021-04-30 2023-05-16 彩虹显示器件股份有限公司 Substrate glass and manufacturing method
CN113429117A (en) * 2021-08-11 2021-09-24 江西鼎盛新材料科技有限公司 Forming device and forming method of microcrystalline glass
CN113429117B (en) * 2021-08-11 2022-05-20 江西鼎盛新材料科技有限公司 Forming device and forming method of microcrystalline glass
CN115215533A (en) * 2022-07-26 2022-10-21 凯盛君恒药玻(青岛)有限公司 Glass melting furnace with overflow device
CN115784576A (en) * 2022-11-30 2023-03-14 湖南旗滨微晶新材料有限公司 Spreading forming equipment, production equipment and spreading forming process for special glass

Also Published As

Publication number Publication date
CN110698043B (en) 2022-03-15

Similar Documents

Publication Publication Date Title
CN110698043B (en) Glass sheet forming apparatus and method
US20220332626A1 (en) Apparatus and method for processing a glass substrate
US3338696A (en) Sheet forming apparatus
EP1765737B1 (en) Glass sheet forming apparatus
JP5004456B2 (en) Float glass processing method for manufacturing thin flat glass
DK150648B (en) PROCEDURE FOR PREPARING A CONTINUOUS GLASS PLATE AND APPARATUS FOR EXERCISING THE PROCEDURE
CN101381195A (en) Fused glass flow control device and control method in glass plate production
CN110963675B (en) Method for controlling forming thickness of overflow brick thin plate
CN102596828A (en) Glass sheet manufacturing method
CN110255864B (en) Glass tube overflow down-drawing forming device and design method thereof
CN108996894B (en) Design method for effective surface width of overflow brick by controlling average thickness of side plate
EP2358647B1 (en) Method and device for producing flat glass
TW201808833A (en) Apparatus and method for glass delivery orientation
US20190169059A1 (en) Methods for forming thin glass sheets
TWI474987B (en) A molten glass supply device
CN110028228B (en) Float glass production method and float glass
CN204803215U (en) Float glass apparatus for producing
CN108328909B (en) Glass production device and production process thereof
US3871854A (en) Manufacture of flat glass ribbons on a molten metal bath
US20190202729A1 (en) Antibody-coated nanoparticle vaccines
CN114409231B (en) Wedge-shaped uniform temperature feeding device applicable to glass melt
CN105417935B (en) Shaping glass sheets device and its forming method
KR200407349Y1 (en) Apparatus for producing sheet glass using the downdraw method
CN116040923A (en) Ultrathin glass manufacturing device
US4197107A (en) Convex bottomed float glass forming chamber entrance

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant