CN112811792A - Forming system and method for substrate glass warping stress zone control - Google Patents
Forming system and method for substrate glass warping stress zone control Download PDFInfo
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- 239000011521 glass Substances 0.000 title claims abstract description 278
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000758 substrate Substances 0.000 title claims description 24
- 238000001816 cooling Methods 0.000 claims abstract description 94
- 239000011449 brick Substances 0.000 claims abstract description 30
- 238000005520 cutting process Methods 0.000 claims abstract description 26
- 238000000137 annealing Methods 0.000 claims abstract description 24
- 238000002791 soaking Methods 0.000 claims abstract description 24
- 238000007493 shaping process Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims description 31
- 238000001514 detection method Methods 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 13
- 238000012544 monitoring process Methods 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 5
- 239000006060 molten glass Substances 0.000 claims description 5
- 239000011819 refractory material Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 238000010583 slow cooling Methods 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000000806 elastomer Substances 0.000 claims description 2
- 238000005192 partition Methods 0.000 claims 1
- 230000035882 stress Effects 0.000 abstract description 44
- 230000008569 process Effects 0.000 abstract description 16
- 239000005357 flat glass Substances 0.000 abstract description 3
- 230000008646 thermal stress Effects 0.000 abstract description 2
- 210000003811 finger Anatomy 0.000 abstract 2
- 210000003813 thumb Anatomy 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000012806 monitoring device Methods 0.000 description 8
- 230000003139 buffering effect Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000002040 relaxant effect Effects 0.000 description 4
- 230000003750 conditioning effect Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 210000004127 vitreous body Anatomy 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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- 239000012530 fluid Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- -1 iron-chromium-aluminum Chemical compound 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- GALOTNBSUVEISR-UHFFFAOYSA-N molybdenum;silicon Chemical compound [Mo]#[Si] GALOTNBSUVEISR-UHFFFAOYSA-N 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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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
- C03B17/067—Forming glass sheets combined with thermal conditioning of the sheets
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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
- C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
- C03B25/04—Annealing glass products in a continuous way
- C03B25/10—Annealing glass products in a continuous way with vertical displacement of the glass products
- C03B25/12—Annealing glass products in a continuous way with vertical displacement of the glass products of glass sheets
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
- C03B33/0207—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor the sheet being in a substantially vertical plane
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- Chemical & Material Sciences (AREA)
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Abstract
A shaping system and method of base plate glass warping stress zone control, set up soaking bellows, thickness adjustment roller group, insulating layer, cooling fine adjustment device and break off with the fingers and thumb in the shaping furnace body along the glass body pull-down direction in proper order from the pointed end of overflow brick, and set up in the cutting knife and break off with the fingers and thumb device of shaping furnace body below, through carrying on the technological adjustment to the refined functional zone of shaping system, provide a accurate temperature field for the gradual cooling process of the glass body, has guaranteed a rational cooling gradient of the glass body between softening point and annealing point, have guaranteed the glass body warping deformation in the cooling process effectively, through the buffer zone that the stress relaxes, the thermal stress that the glass body is caused by the temperature difference deformation has been reduced to the utmost extent at the same time.
Description
Technical Field
The invention relates to a substrate glass manufacturing device, in particular to a forming system and a forming method for substrate glass warping stress zone control.
Background
The substrate glass used in the flat panel display manufacturing field of general TFT-LCD (thin film transistor display), PDP (plasma display panel) and the like has high requirement on flatness, and any warping or fluctuation of the glass body 10 can directly affect the quality of the panel and seriously affect the distortion of the panel of the display device.
Warping is a defect in the process of producing flat glass and a technical problem often encountered in the process of manufacturing flat glass. In the overflow method substrate glass production, when molten glass enters a forming area through an overflow device, the lower edge part is rapidly cooled under the action of an edge roller, and the forming width of the substrate glass is ensured. And then, entering a forming stage, wherein the temperature of the glass body 10 in the region is required to be rapidly and stably reduced according to the viscosity-temperature curve of the glass characteristic, and meanwhile, the constant temperature field in the system is ensured, so that the consistency of the surface tension and the stress of the glass in the cooling process can be ensured, and the surface stress and the warping are minimized.
Usually, the surface flatness of the substrate glass must be 100-190 μm, with the continuous development of liquid crystal display technology, G8.5 and higher generation substrate glass will become mainstream, and the product thickness also has 0.7mm and gradually develops to 0.4mm or even thinner glass, the requirements of the corresponding glass surface quality such as stress and warpage become higher and higher, the production according to the original process standard can not meet the higher and higher customer requirements, and the production difficulty becomes higher and higher.
Disclosure of Invention
Aiming at the problem of stress warping generated by the glass surface under the action of stress in the prior art, the invention provides a forming system and a forming method for substrate glass warping stress zone control.
The invention is realized by the following technical scheme:
a forming system for substrate glass warpage stress zone control comprises an overflow brick arranged in a forming furnace body, a soaking bellows, a thickness adjusting roller set, a heat insulation layer, a cooling fine adjustment device, a plate breaking clamping roller, a cutting knife and a plate breaking device, wherein the soaking bellows, the thickness adjusting roller set, the heat insulation layer, the cooling fine adjustment device and the plate breaking clamping roller are arranged in the forming furnace body from the tip of the overflow brick in sequence along the downward pulling direction of a glass body; a plurality of groups of heating devices are respectively arranged on the two sides and the top of the overflow brick; the soaking bellows are symmetrically arranged at two sides of the glass, the upper end of the soaking bellows is provided with a temperature monitoring point, and the lower end of the soaking bellows is provided with a movable baffle; the thickness adjusting roller set is arranged below the movable baffle; the thickness adjusting roller set and the severing plate clamping roller are arranged at corresponding positions to tightly clamp the glass body; a first temperature adjusting unit is arranged on two sides of the glass body between the thickness adjusting roller set and the heat insulation layer; second temperature adjusting units are respectively arranged on the outer sides of the cooling fine adjusting devices; three groups of the clamping rollers for snapping off are arranged along the flow direction of the glass body, and the outer sides of the three groups of the clamping rollers are correspondingly provided with a third temperature regulating unit, a fourth temperature regulating unit and a fifth temperature regulating unit respectively.
Furthermore, the temperature adjusting unit comprises a heating device, a refractory material, a cooling device and a heat insulating material which are arranged along the glass body in sequence; the heating device is arranged close to two side edges of the glass body, and the cooling device is arranged corresponding to the middle of the glass body.
Furthermore, a cooling air pipe is arranged in the soaking air box.
Further, the upper surface and the lower surface of the heat insulation layer are respectively sealed with the first temperature adjusting unit and the second temperature adjusting unit, and a plurality of first temperature detection devices are arranged inside the heat insulation layer.
Furthermore, the cooling fine adjustment devices are symmetrically arranged on two sides of the glass body and comprise a bracket and a cooling pipe, and the cooling pipe penetrates through a strip-shaped hole formed in the bracket and is arranged parallel to the glass body; the cooling pipe is connected with the strip-shaped hole in a sliding mode, and the length direction of the strip-shaped hole is perpendicular to the glass body.
Further, the cooling pipes are arranged in a multilayer mode in the glass body flow direction and penetrate through the whole glass body in the width direction.
Further, a third temperature detection device, a fourth temperature detection device and a fifth temperature detection device are respectively arranged on the third temperature adjustment unit, the fourth temperature adjustment unit and the fifth temperature adjustment unit.
A forming method for substrate glass warping stress zone control comprises the following steps:
dividing a temperature control area; dividing a temperature control area corresponding to the overflow brick into an overflow area;
dividing a temperature control area corresponding to the overflow brick tip and the thickness adjusting roller set into two areas of thickness adjusting areas;
a temperature control area corresponding to the first temperature adjusting unit is divided into three temperature fine adjusting areas;
the temperature control area corresponding to the heat insulation layer is divided into four stress relaxation areas;
the temperature control area corresponding to the second temperature adjusting unit is divided into five quick forming cooling areas;
the temperature control areas corresponding to the third temperature adjusting unit, the fourth temperature adjusting unit and the fifth temperature adjusting unit are divided into six annealing areas;
the temperature control area corresponding to the cutting knife and the plate severing device is divided into seven glass body cutting areas;
respectively carrying out target control on the temperature of each area according to the division of the temperature control areas;
an overflow area of the first area heats the molten glass by a heating device, and the target temperature is 1200-1250 ℃;
the thickness adjusting roller group clamps and drives the glass body, and meanwhile, the soaking bellows cools the glass body, and the target temperature of the thickness adjusting area in the second area is 1050-1110 ℃;
when the glass body reaches a three-zone temperature fine adjustment zone, a five-zone rapid cooling shaping zone and a six-zone annealing zone, the middle part of the glass body is cooled, and the two sides are heated to achieve the consistency of the temperature of the glass body in the non-flow direction; the target temperature of the fine temperature adjustment area in the three area is 950-1050 ℃, the target temperature of the rapid cooling and shaping area in the five area is 750-950 ℃, and the target temperature of the annealing area in the six area is 200-750 ℃;
when the glass body reaches a stress buffering and relaxing area of the four areas, temperature monitoring and comparison are carried out through a first temperature detection device, slow cooling is carried out in a heat preservation mode, and the target temperature of the stress buffering and relaxing area of the four areas is 900-950 ℃;
when the five-zone fast cooling and shaping zone of the glass body is formed, the cooling fine adjustment device fast cools the whole glass body (10), and the target temperature of the six-zone annealing zone is 200-750 ℃;
when the glass body reaches a seven-zone glass body cutting area, clamping the glass body through three groups of plate breaking and clamping rollers in a six-zone annealing zone, transversely cutting the glass body by using a cutting knife, and performing plate breaking and clamping actions by using a plate breaking device to realize the forming and slicing of the glass body, wherein the target temperature of the seven-zone glass body cutting area is 150-200 ℃;
furthermore, the soaking bellows in the two-zone thickness adjusting zone rapidly cools the glass body to form an elastic body.
Further, the viscosity of the glass in the overflow area of the first area is 103.5-104 Pa.S; the viscosity of the glass in the two-area thickness adjusting area is 105 Pa.S; the viscosity of the glass in the three-region temperature fine adjustment region is 106-106 Pa.S; the viscosity of the glass in the four stress buffer relaxation areas is 108-1010 Pa.S; the glass viscosity of the five-zone rapid forming cooling zone is 1011～1012Pa.S; the viscosity of the glass in the six annealing areas is 1012～1014～10∞Pa.S。
Compared with the prior art, the invention has the following beneficial technical effects:
a forming system for substrate glass warpage stress zone control comprises an overflow brick arranged in a forming furnace body, a soaking bellows, a thickness adjusting roller set, a heat insulation layer, a cooling fine adjustment device, a plate breaking clamping roller, a cutting knife and a plate breaking device, wherein the soaking bellows, the thickness adjusting roller set, the heat insulation layer, the cooling fine adjustment device and the plate breaking clamping roller are arranged in the forming furnace body from the tip of the overflow brick in sequence along the downward pulling direction of a glass body; a plurality of groups of heating devices are respectively arranged on the two sides and the top of the overflow brick to ensure the viscosity and the fluidity of the glass liquid in the overflow brick; the soaking bellows are symmetrically arranged at two sides of the glass, the upper ends of the soaking bellows are provided with temperature monitoring points, the lower ends of the soaking bellows are provided with movable baffles, the temperature of the glass liquid is monitored in real time through the temperature monitoring points, the cooling air volume supply of the soaking bellows is matched, and meanwhile, the movable baffles play a role in isolating the influence of the high temperature at one side of the overflow brick; through the tightening and the drive of roller group, pass through first temperature regulation unit, heat preservation, second temperature regulation unit, the cooling accurate adjustment device in proper order, third temperature regulation unit, fourth temperature regulation unit and fifth temperature regulation unit, realize the temperature uniformity of the horizontal same horizontal plane of glass body to reduce the warpage that the horizontal same horizontal plane of glass body caused by the temperature difference, the cooling accurate adjustment device carries out rapid cooling effect to the glass body, realizes the rapid prototyping of the glass body.
Furthermore, the temperature adjusting unit sequentially comprises a heating device, a refractory material, a cooling device and a heat insulating material along one side of the glass body, the heating device is arranged at two non-flowing sides of the glass body, the cooling device is arranged in the non-flowing middle of the glass body, generally speaking, most of adjusting units at the edges of the glass body are in a heating state, the adjusting units at the middle of the glass body have more utilized cooling adjusting functions, all the heating units are independently controlled, and data fed back by a temperature monitoring device arranged on the support are matched, so that different temperature adjustments can be provided in real time according to preset temperature comparison, the fine adjustment effect of the temperature of the glass body is achieved, and finally the consistency of the non-flowing temperature of the glass body is achieved. Thereby reducing the edge warpage of the glass body caused by temperature inconsistency.
Further, the inside cooling tuber pipe that sets up of soaking bellows, the tuber pipe is inside bellows, the edge roller device is thickness adjustment roller set, thickness data through temperature monitoring point and back process feedback carries out the comprehensive evaluation to the glass flow state, adjust thickness according to thickness evaluation result, through the amount of wind of the inside corresponding adjustment tuber pipe of the thickness bellows that the adjustment corresponds, take away the heat of corresponding position through the heat exchange, further reduce corresponding glass temperature, make its viscosity increase, reduce the molecule expansion ability, thereby reach the purpose of optimizing the thickness that the vitreous body non-flowed to.
Further, a heat insulating material with low thermal conductivity and a plurality of temperature detection devices; the cooling rate of the glass body is reduced through heat preservation measures, the effect of internal stress relaxation of the glass body is further played, and the warping deformation of the glass body is reduced;
further, the cooling fine adjustment device comprises a cooling pipe and strip-shaped holes in the support, the cooling pipe is arranged in the strip-shaped holes and can move along the non-flow direction of the glass body, the strip-shaped holes are tightly close to two sides of the glass body and penetrate through the width direction of the whole glass body, when the distance between the strip-shaped holes and the glass body is short, the cooling effect is strong, when the distance is long, the cooling effect is weak, and the whole cooling mode of the glass body can be carried out according to the actually measured control target temperature;
the invention relates to a molding method for substrate glass warpage stress zone control, which comprises the steps of dividing molding equipment into seven areas according to a temperature control area, and dividing a temperature control area corresponding to an overflow brick into an overflow area; dividing a temperature control area corresponding to the overflow brick tip and the thickness adjusting roller set into two area thickness adjusting areas; a temperature control area corresponding to the first temperature adjusting unit is divided into three temperature fine adjusting areas; a temperature control area corresponding to the heat insulation layer is divided into four stress relaxation areas; a temperature control area corresponding to the second temperature adjusting unit is divided into five quick forming cooling areas; temperature control areas corresponding to the third temperature adjusting unit, the fourth temperature adjusting unit and the fifth temperature adjusting unit are divided into six annealing areas; dividing a temperature control area corresponding to the plate severing device and the cutting knife into seven glass body cutting areas;
heating the inner glass body by a heating device around the overflow brick to ensure good fluidity of the glass body, clamping and driving the glass body by a thickness adjusting roller group when the glass body is acted to the bottom of the overflow brick by gravity, and blowing cooling air to the glass body by a cooling device to rapidly cool the glass body to form an elastic body; when the glass body reaches a three-zone temperature fine adjustment zone, a five-zone rapid cooling shaping zone and a six-zone annealing zone, the temperature adjustment unit cools the middle part of the glass body, and the two sides of the glass body are subjected to heating treatment to achieve the temperature consistency of the glass body in the non-flow direction, so that the stress buckling deformation caused by the temperature inconsistency in the forming process of the glass body is avoided; when the stress buffering and relaxing area of the glass body reaches the four areas, temperature monitoring and comparison are carried out through a temperature detection device, slow cooling is carried out in a heat preservation mode, and the stress inside the glass body is relaxed through slow cooling; when the glass body is rapidly cooled to the five regions and is rapidly shaped, the cooling pipe rapidly cools the whole glass body and rapidly shapes the glass body; when the glass body reaches a seven-area glass body cutting area, the glass body is clamped by a plurality of groups of short rollers in a six-area annealing area, the glass body is transversely cut by a cutting knife, and a plate breaking device performs plate breaking action, so that the glass body is stable up and down in the cutting process, the glass body is not damaged due to vibration of the upper area, and finally the glass body is divided into products;
the temperature of the overflow area of the first area is 1200-1250 ℃, the temperature of the thickness adjusting area of the second area is 1050-1110 ℃, the temperature of the fine temperature adjusting area of the third area is 950-1050 ℃, the temperature of the stress buffering and relaxing area of the fourth area is 900-950 ℃, the temperature of the rapid cooling and shaping area of the fifth area is 750-950 ℃, the temperature of the annealing area of the sixth area is 200-750 ℃, and the temperature of the cutting area of the glass body 10 of the seventh area is 150-200 ℃; the viscosity of the glass in the overflow area of one zone is 103.5～104Pa.S; the viscosity of the glass of the two-zone thickness adjusting zone is 105Pa.S; the viscosity of the glass in the three-zone temperature fine adjustment zone is 106～106Pa.S; the viscosity of the glass in the four-region stress buffer relaxation region is 108～1010Pa.S; the glass viscosity of the five-zone rapid forming cooling zone is 1011～1012Pa.S; the viscosity of the glass in the six annealing areas is 1012～1014～10∞Pa.S; the temperature values in different areas are set according to different viscosities of glass at different temperatures, so that a reasonable cooling gradient between a softening point and an annealing point of a glass body is ensured, the glass body warping deformation in the cooling process is effectively reduced, and meanwhile, the thermal stress caused by temperature difference deformation of the glass body is reduced to the maximum extent through a buffer area with relaxed stress.
Drawings
FIG. 1 is a front view of a temperature control system according to an embodiment of the present invention;
FIG. 2 is a side view of a temperature control system in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of the warpage of a glass body according to the present invention;
fig. 4 is a schematic structural diagram of a temperature control unit in an embodiment of the invention.
In the figure: a glass body 10; an overflow brick 11; a heating device 12; a nip roller device 21; the edge 101 of the glass body 10; a temperature monitoring point 211; an air duct 221; a blower 222; a thickness adjusting roller group 21; a first temperature adjusting unit 30; a heat insulating layer 42; a first temperature detection device 411; a second temperature adjusting unit 50; a cooling pipe 51; a strip-shaped hole 52; a third temperature adjusting unit 60; a fourth temperature adjusting unit 70; a fifth temperature adjusting unit 80; a sixth zone first roller set 610; a sixth zone second roller set 710; a sixth zone third roller set 810; a first temperature monitoring device 611; a second temperature monitoring device 711; a third temperature monitoring device 811; a board severing device 91; a cutting blade 92; the glass body 10 is a monolithic product 90; a glass body edge 101; the glass body 10 is distorted 102; a heating device 103; a cooling device 105; a refractory material 104; an insulating material 106.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention discloses a forming system for substrate glass warping stress zone control, and aims to perform fine zone design on forming equipment according to glass viscosity temperature characteristics, wherein the forming equipment respectively comprises a first zone overflow area, a second zone thickness adjusting area, a three-zone temperature fine adjusting area, a four-zone stress buffering relaxation area, a five-zone rapid cooling forming area, a six-zone annealing area and a seven-zone cutting area, and seven fine zone control is achieved. As shown in FIG. 1, in the overflow area of the temperature control system, the viscosity of the molten glass from the supply system was about 103.5Pa.S, the glass has good fluidity, and in order to ensure that the viscosity of the glass does not change greatly, a plurality of heating devices 12 are arranged at two sides and the top of the overflow brick 11 in an overflow area, and the heating devices are made of silicon carbide materials.
When the molten glass 10 overflows from both sides of the overflow brick 11 and flows down uniformly, and enters the thickness adjusting area under the action of gravity, the viscosity of the glass is about 105Pa.S, still has good fluidity, a plurality of temperature monitoring points 211 are arranged in the non-flow direction, namely the width direction, of the glass at the lower part of the brick tip, the flow state of the glass is comprehensively evaluated through temperature monitoring and thickness data fed back by a post process, the thickness is adjusted according to the thickness evaluation result, the air quantity of the corresponding adjusting air pipe 221 in the corresponding thickness air box 222 is adjusted, the heat at the corresponding position is taken away through heat exchange, and the quantity of the heat corresponding to the glass body is further reducedTemperature, increasing its viscosity, reducing the molecular expansion capability, thereby achieving the goal of optimizing the thickness of the vitreous body 10 that is not flowing.
As the glass body 10 continues to descend into the two-zone thickness adjustment zone, the viscosity of the glass body 10 is about 105～106And when the pressure is Pa.S, the thickness adjusting roller set 21 clamps and drives the glass body 10, and the cooling device simultaneously blows cooling air to the glass body 10 to rapidly cool the glass body to form an elastic body and inhibit the further inward shrinkage of the glass body 10. Meanwhile, a movable baffle device 23 is arranged above the edge roller, so that the temperature influence of the edge roller on the upper glass can be shielded, and meanwhile, the shielding and protecting effects on the airflow direction of the whole equipment are also achieved.
As shown in fig. 3, since the temperature of the middle portion of the glass body 10 is high and the temperature of the side portions 101 of the glass body 10 is low, the inward shrinkage of the middle portion is limited by the side portions 101 during the lowering and gradual temperature reduction of the glass body 10, and under the influence of the interaction force, the glass body 10 is distorted as shown at 102.
To avoid or minimize further distortion of the glass body 10, a first temperature conditioning unit 30 is provided facing the glass body 10 in a three-zone fine temperature conditioning zone while the glass is still viscous, the apparatus being positioned along the length of the glass body 10, each conditioning unit having both heating and cooling functions. Generally, most of the adjusting units facing the side portions 101 of the glass body 10 are in a heating state, while the middle adjusting units have more cooling adjusting functions, and the heating units are independently controlled to perform the function of finely adjusting the temperature of the glass body 10, so as to finally achieve the consistency of the non-flowing temperature of the glass body 10.
When the glass body 10 enters the four-region stress buffering relaxation region, the viscosity of the glass body 10 is about 108-1010 Pa.s, the glass body 10 is in a viscoelasticity state, the non-flowing temperature is basically consistent through the adjustment of the three-region temperature fine adjustment region, the temperature reduction rate of the glass body 10 is reduced through heat preservation measures, the internal stress relaxation effect of the glass body 10 is further achieved, and the buckling deformation of the glass body 10 is reduced.
The main function of the five-zone rapid cooling and shaping zone is to rapidly cool and shape the glass body 10, and is provided with not only the independent second temperature adjusting unit 50 but also the independent cooling pipe 51, and the cooling pipe 51 can slide along the strip-shaped hole 52 relative to the glass body 10 according to the cooling effect. When the distance from the glass body 10 is short, the cooling effect is strong, and when the distance is long, the cooling effect is weak. Generally, the overall cooling of the glass body 10 is carried out according to the actually measured control target temperature, the cooling pipe 51 can be used independently, or a plurality of groups of cooling pipes can be combined, the purpose of rapid cooling and shaping is finally achieved, and the viscosity of the glass body 10 at the outlet of the five-zone rapid cooling and shaping zone is about 1011 to 1012 Pa.s.
The primary function of the six-zone annealing zone is to anneal the glass body 10 to a target viscosity range of 1012～1014～10∞Pa.s, not only the third temperature adjusting unit 60, the fourth temperature adjusting unit 70 and the fifth temperature adjusting unit 80 are provided, but also the corresponding first temperature monitoring device 611, the second temperature monitoring device 711 and the third temperature monitoring device 811 are provided; meanwhile, a first roller set 610, a second roller set 710 and a third roller set 810 are respectively arranged at two sides of the glass body 10 along the length direction, and the rollers clamp the glass body 10 and rotate at a constant speed to pull the glass body 10 to descend at a constant speed.
The seventh area is a transverse plate-severing area of the glass body 10, the cutting knife 92 transversely cuts the glass body 10, and then the plate-severing device 91 performs plate-severing action to realize the product 90 formed by dividing the glass body 10 into pieces.
Generally, in the process of breaking off the glass, the glass body 10 is vibrated and shaken, even transmitted to more than four areas, and the warping and stress variation of the glass are seriously influenced, and the device adopts a plurality of groups of short rollers for clamping in an annealing area, so that the shaking transmission during the process of breaking off the glass is effectively weakened, and the quality of the glass body 10 is stabilized.
Fig. 4 shows a structural diagram of the temperature adjustment unit, which includes the first temperature adjustment unit 30, the second temperature adjustment unit 50, the third temperature adjustment unit 60, the fourth temperature adjustment unit 70, and the fifth temperature adjustment unit 80, a heating device 103 is provided at a position closest to the glass body 10 at the forefront of each unit, the heating device 103 is made of materials such as iron-chromium-aluminum or silicon-molybdenum, a cooling device 105 is provided in the middle of each unit, the units are made of a metal coil structure, cooling air is introduced into the middle of each unit, a refractory material 104 is provided between 105 and 103, and a heat insulation material 106 is provided at the other side of 105.
The invention provides a forming method for substrate glass warping stress zone control, and aims to provide temperature monitoring for the whole glass plate forming process, and perform temperature rise and temperature fall in a targeted manner, so that the problem of warping of a glass plate due to temperature and stress is solved. The first zone overflow area is provided with a temperature monitoring point 211, the fourth zone stress buffering relaxation area is provided with a temperature detection device 411, and the three-zone temperature fine adjustment area, the five-zone rapid cooling forming area and the six-zone annealing area are respectively provided with independent temperature adjusting units which are opposite to the glass body 10 and are respectively a first temperature adjusting unit 30, a second temperature adjusting unit 50, a third temperature adjusting unit 60, a fourth temperature adjusting unit 70 and a fifth temperature adjusting unit 80. In a zone overflow zone, the target viscosity of the glass is less than 103.5～104The target viscosity of the pa.s glass liquid when flowing down and merging through both sides of the overflow brick 11 is about 105Pa.s, where the glass has good flow properties. As the glass continuously descends and enters the forming thickness adjusting area, because the glass is a free flowing solution at the moment, a cooling device is arranged at the non-flowing position at the height, the non-flowing temperature can be finely adjusted, and the thickness consistency of the glass body 10 is ensured. Then, the glass enters a width shaping area of an edge roller, the glass edge area is clamped and rapidly cooled, namely, two end parts of the glass body 10 are clamped by a pair of clamping rollers communicated with cold air, along with rapid reduction of temperature, the glass body 10 is rapidly cooled by the edge part and does not shrink inwards any more, the sheet width of the glass is ensured, but at the moment, the temperature of the edge part is low, the temperature of the middle area is high, and the glass is limited to generate transverse temperature difference stress due to the fact that the middle part needs to shrink inwards in the process that the glass continues to flow downwards, so that the glass is seriously warped and deformed, and even breaks.
According to the theory of glass viscosity, when the viscosity is 104～108The glass is a high-viscosity plastic body under the condition of Pa.S, the internal displacement activity of the glass is very large, the structure adjustment is fast, the temperature difference is generated but the structure difference is not generated, no stress field exists, and when the viscosity of the glass reaches108～1011Pa.s, when the glass is in the transition from elastoplastomer to elastomer, the internal structural groups and molecules shift, and when the structural differences generated by internal adjustment and temperature difference counteract, the internal stress is zero, i.e. the so-called stress relaxation effect. When the glass viscosity reached 1011～1014Pa.s, glass gradually transitions to a fully elastic body, at which time the stress generated by the temperature difference of the glass is a temporary stress and disappears with uniform temperature.
According to the theoretical analysis of glass viscosity, in order to achieve the purpose of effectively controlling the warpage and stress of the glass body 10, the invention adopts the following technical scheme:
as shown in fig. 1 and 2: the overflow area of one area, the area that overflow brick 11 corresponds, the liquid glass is the fluid of free flow in the overflow area of one area, for guaranteeing glass's mobility, is provided with multiunit heating device 12 here, has effectively guaranteed the inside temperature field in overflow area, has guaranteed that the liquid glass flows down and joins at the brick point department by overflow brick 11 both sides.
The second area glass thickness molding fine adjustment area is an area from the overflow brick tip to the area corresponding to the thickness adjusting roller set 21, the glass liquid still has good fluidity when entering the area, a thickness adjusting device is arranged at the area, and the glass flow at the area is improved or weakened to achieve the uniformity of the thickness through the adjustment of the temperature at the corresponding position; meanwhile, an edge roller device is arranged below the thickness adjusting device, namely, edge rollers filled with cooling air clamp two ends of the glass, so that the glass is rapidly cooled, further inward shrinkage of the glass body 10 is inhibited, and the plate width of the glass is ensured;
in the three-zone warpage adjusting area, namely, the area corresponding to the first temperature adjusting unit 30, due to the clamping of the edge roller, the temperature of the glass body 10 at the edge is significantly lower than that of the middle area, and in the process that the glass gradually flows down and is cooled, the middle glass body 10 is limited to contract inwards to generate tensile stress, and if the glass is further developed, the glass is warped and deformed, and even the glass is in a risk of breaking. In this region, therefore, a heating and cooling device is provided facing the glass body 10, which device is provided with a heating device on the side facing the glass body 10, and a cooling device, which is a coil pipe through which cooling water or cooling air is passed, is provided at the rear of the heating device.
The four regions stress relaxation region, namely the region corresponding to the thermal insulation layer 42, is all made of thermal insulation material with low thermal conductivity around the region, and a temperature monitoring device of the glass body 10 is arranged in the non-flowing region of the glass, so that the temperature is compared with the temperature of the brick tip and the transverse temperature, and whether the temperature reduction rate of the glass body 10 is theoretically designed or not is monitored. Here with the viscosity of the vitreous 10 of 108～1010And Pa.S, the temperature is slowly reduced in a heat preservation mode, so that the effective flow in the glass is effectively ensured, and the purpose of stress release is achieved.
The five regions are fast cooling forming shaping regions, namely regions corresponding to the second temperature adjusting units 50, and besides the heating and cooling units, the regions are also provided with independent cooling pipes, and the cooling device transversely penetrates through the length direction of the whole glass body 10 to play a role in fast cooling the whole glass body.
Six-zone annealing regions, i.e., regions corresponding to the third temperature adjusting unit 60, the fourth temperature adjusting unit 70, and the fifth temperature adjusting unit 80, where the viscosity of the glass body 10 is 1012～1014～10∞Pa.S, the glass form is gradually changed from an elastic plastic body to a complete elastic body, and the heating device is not only provided with a uniform distribution, but also provided with a plurality of groups of clamping short rollers.
The seven-area glass body 10 cutting area is a complete elastic body when the temperature of the glass is reduced to be close to room temperature, the glass body 10 is clamped by the groups of short rollers in the six areas while the glass body 10 is cut and broken, and vibration and deformation during cutting are effectively reduced.
The control glass viscosity and temperature targets mentioned in the above embodiments are the viscosity-temperature corresponding relation of the actual production recipe, and the actual production is controlled by the target process temperature, generally speaking, the temperature of each zone corresponding to the target viscosity of each zone is 1200-1250 ℃; the target temperature of the second zone is 1050-1110 ℃; the target temperature of the three zones is 950-1050 ℃; the target temperature of the fourth area is 900-950 ℃; the target temperature of the five zones is 750-950 ℃; the temperature of the sixth area is 200-750 ℃; the target temperature of the seven zones is 150-200 ℃.
Claims (10)
1. A forming system for substrate glass warpage stress zone control is characterized by comprising an overflow brick (11) arranged in a forming furnace body, a soaking box (222), a thickness adjusting roller set (21), a heat insulation layer (42), a cooling fine adjustment device, a plate breaking clamping roller, a cutting knife (92) and a plate breaking device (91) which are arranged below the forming furnace body, wherein the soaking box, the thickness adjusting roller set and the plate breaking clamping roller are arranged in the forming furnace body from the tip of the overflow brick in sequence along the pull-down direction of a glass body (10);
a plurality of groups of heating devices (12) are respectively arranged on the two sides and the top of the overflow brick (11);
the soaking air boxes (222) are symmetrically arranged on two sides of the glass, the upper ends of the soaking air boxes are provided with temperature monitoring points (211), and the lower ends of the soaking air boxes are provided with movable baffles (23);
the thickness adjusting roller set (21) is arranged below the movable baffle (23); the thickness adjusting roller set (21) and the snapping plate clamping roller are arranged at corresponding positions to tightly clamp the glass body (10);
a first temperature adjusting unit (30) is arranged on two sides of the glass body (10) between the thickness adjusting roller set (21) and the heat insulation layer (42); second temperature adjusting units (50) are respectively arranged at the outer sides of the cooling fine adjusting devices; three groups of the snapping clamping rollers are arranged along the flowing direction of the glass body (10), and the outer sides of the three groups of the snapping clamping rollers are respectively and correspondingly provided with a third temperature regulating unit (60), a fourth temperature regulating unit (70) and a fifth temperature regulating unit (80).
2. The forming system for zonal control of substrate glass warp stress as recited in claim 1, wherein the temperature adjustment unit comprises a heating device (103), a refractory material (104), a cooling device (105) and an insulating material (106) arranged in sequence along the glass body (10);
the heating device (103) is arranged close to two side edges of the glass body (10), and the cooling device (105) is arranged corresponding to the middle of the glass body (10).
3. The forming system for zone control of substrate glass warp stress according to claim 1, characterized in that a cooling air pipe (221) is arranged inside the soaking air box (222).
4. The forming system for the partition control of the warping stress of the substrate glass according to claim 1, wherein the upper and lower surfaces of the heat insulating and heat preserving layer (42) are respectively sealed with the first temperature adjusting unit (30) and the second temperature adjusting unit (50), and a plurality of first temperature detecting devices (411) are arranged inside the heat insulating and heat preserving layer.
5. The forming system for the zonal control of the substrate glass warp stress according to claim 1, wherein the cooling fine-tuning devices are symmetrically arranged on two sides of the glass body (10) and comprise a bracket and a cooling pipe (51), and the cooling pipe (51) is arranged in parallel with the glass body (10) through a strip-shaped hole (52) arranged on the bracket; the cooling pipe (51) is connected with the strip-shaped hole (52) in a sliding mode, and the length direction of the strip-shaped hole (52) is perpendicular to the glass body (10).
6. The glass warp stress zone control molding system of a substrate according to claim 1, wherein the cooling tubes (51) are arranged in multiple layers in the flow direction of the glass body (10) and extend across the entire width of the glass body (10).
7. The forming system for zone control of substrate glass warp stress according to claim 1, wherein a third temperature detection device (611), a fourth temperature detection device (711) and a fifth temperature detection device (811) are respectively arranged on the third temperature adjusting unit (60), the fourth temperature adjusting unit (70) and the fifth temperature adjusting unit (80).
8. A forming method for substrate glass warp stress zone control is characterized in that the forming system based on any one of claims 1-7 comprises the following steps:
dividing a temperature control area;
dividing a temperature control area corresponding to the overflow brick (11) into an overflow area;
the temperature control area corresponding to the overflow brick tip and the thickness adjusting roller set (21) is divided into two areas, namely a thickness adjusting area;
the temperature control area corresponding to the first temperature adjusting unit (30) is divided into three temperature fine adjusting areas;
the temperature control area corresponding to the heat insulation layer (42) is divided into four stress relaxation areas;
the temperature control area corresponding to the second temperature adjusting unit (50) is divided into five quick forming cooling areas;
the temperature control areas corresponding to the third temperature adjusting unit (60), the fourth temperature adjusting unit (70) and the fifth temperature adjusting unit (80) are divided into six annealing areas;
the temperature control area corresponding to the cutting knife (92) and the plate severing device (91) is divided into seven glass body cutting areas;
respectively carrying out target control on the temperature of each area according to the division of the temperature control areas;
an overflow area of the first area heats the molten glass by a heating device (12) to the target temperature of 1200-1250 ℃;
the thickness adjusting roller set (21) clamps and drives the glass body (10), and meanwhile, the soaking air box (222) cools the glass body (10), and the target temperature of the thickness adjusting area in the second area is 1050-1110 ℃;
when the glass body (10) reaches a three-zone temperature fine adjustment zone, a five-zone rapid cooling shaping zone and a six-zone annealing zone, the middle part of the glass body (10) is cooled, and the two sides are heated to achieve the temperature consistency of the glass body (10) in the non-flow direction; the target temperature of the fine temperature adjustment area in the three area is 950-1050 ℃, the target temperature of the rapid cooling and shaping area in the five area is 750-950 ℃, and the target temperature of the annealing area in the six area is 200-750 ℃;
when the glass body (10) is in a stress buffer relaxation area with four areas, temperature monitoring and comparison are carried out through a first temperature detection device (411), slow cooling is carried out in a heat preservation mode, and the target temperature of the stress buffer relaxation area with four areas is 900-950 ℃;
when the glass body (10) is cooled and shaped rapidly in five areas, the cooling fine adjustment device rapidly cools the whole glass body (10), and the target temperature of the six annealing areas is 200-750 ℃;
when the glass body (10) reaches a seven-area glass body cutting area, the glass body is clamped by three groups of plate-breaking clamping rollers in a six-area annealing area, the glass body (10) is transversely cut by a cutting knife (92), and the plate-breaking device (91) performs plate-breaking action to realize the forming and slicing (90) of the glass body (10), wherein the target temperature of the seven-area glass body cutting area is 150-200 ℃.
9. The method of claim 8, wherein the two-zone thickness adjusting zone soaking bellows (222) rapidly cools the glass body (10) to form an elastomer.
10. The method of claim 8, wherein the glass in the overflow area has a viscosity of 103.5～104Pa.S; the viscosity of the glass of the two-zone thickness adjusting zone is 105Pa.S; the viscosity of the glass in the three-zone temperature fine adjustment zone is 106～106Pa.S; the viscosity of the glass in the four-region stress buffer relaxation region is 108～1010Pa.S; the glass viscosity of the five-zone rapid forming cooling zone is 1011～1012Pa.S; the viscosity of the glass in the six annealing areas is 1012～1014～10∞Pa.S。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114394736A (en) * | 2021-12-20 | 2022-04-26 | 彩虹显示器件股份有限公司 | Device and method for controlling forming curvature of substrate glass |
| CN115196860A (en) * | 2022-07-18 | 2022-10-18 | 河北光兴半导体技术有限公司 | Broken plate processing method and device in glass production |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017065988A (en) * | 2015-09-30 | 2017-04-06 | ＡｖａｎＳｔｒａｔｅ株式会社 | Method and apparatus for manufacturing glass substrate |
| CN110114319A (en) * | 2016-12-21 | 2019-08-09 | 康宁股份有限公司 | For managing the cooling method and apparatus of glass tape |
| CN110746095A (en) * | 2019-09-29 | 2020-02-04 | 彩虹显示器件股份有限公司 | Substrate glass production forming equipment with refined temperature adjustment function |
| CN215440178U (en) * | 2021-01-29 | 2022-01-07 | 彩虹显示器件股份有限公司 | Forming system for substrate glass warpage stress zone control |
-
2021
- 2021-01-29 CN CN202110133343.5A patent/CN112811792B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017065988A (en) * | 2015-09-30 | 2017-04-06 | ＡｖａｎＳｔｒａｔｅ株式会社 | Method and apparatus for manufacturing glass substrate |
| CN110114319A (en) * | 2016-12-21 | 2019-08-09 | 康宁股份有限公司 | For managing the cooling method and apparatus of glass tape |
| CN110746095A (en) * | 2019-09-29 | 2020-02-04 | 彩虹显示器件股份有限公司 | Substrate glass production forming equipment with refined temperature adjustment function |
| CN215440178U (en) * | 2021-01-29 | 2022-01-07 | 彩虹显示器件股份有限公司 | Forming system for substrate glass warpage stress zone control |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114394736A (en) * | 2021-12-20 | 2022-04-26 | 彩虹显示器件股份有限公司 | Device and method for controlling forming curvature of substrate glass |
| CN114394736B (en) * | 2021-12-20 | 2023-12-12 | 彩虹显示器件股份有限公司 | Device and method for controlling bending degree of substrate glass molding |
| CN115196860A (en) * | 2022-07-18 | 2022-10-18 | 河北光兴半导体技术有限公司 | Broken plate processing method and device in glass production |
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