CN114394736A

CN114394736A - Device and method for controlling forming curvature of substrate glass

Info

Publication number: CN114394736A
Application number: CN202111567016.7A
Authority: CN
Inventors: 李淼; 胡卫东; 张志军; 袁作臻
Original assignee: Irico Display Devices Co Ltd
Current assignee: Irico Display Devices Co Ltd
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2022-04-26
Anticipated expiration: 2041-12-20
Also published as: CN114394736B

Abstract

The invention discloses a device and a method for controlling the forming curvature of substrate glass, which comprise a first baffle plate, a second baffle plate and a third baffle plate, wherein the first baffle plate is arranged between a thickness forming area and a stress annealing area of a substrate glass forming device; a pressure control device is arranged between the second baffle plate and the third baffle plate; the first baffle, the second baffle and the third baffle can be close to or far away from the substrate glass; one side of the chopping block strip in the severing board cutting area, which is contacted with the glass, is set to be an arc-shaped surface. The device sets up different regulating part in the different regions of base plate glass forming device, has realized the accurate control to base plate glass shaping crookedness, keeps the stability of glass board BOW type in the stove. The arc-shaped cutting board strip keeps the consistency of the glass plate in the BOW direction. The device reasonable in design, the simple operation.

Description

Device and method for controlling forming curvature of substrate glass

Technical Field

The invention belongs to the field of substrate glass manufacturing equipment, and relates to a device and a method for controlling the forming curvature of substrate glass.

Background

The glass substrate is an important component of a flat panel display device, and a TFT substrate or a CF substrate is required to have stable flatness and ensure stability and no deformation in the processing and manufacturing process. In the forming process of the glass substrate, the glass substrate is directly subjected to severe and uneven temperature change and internal and external temperature difference, so that the glass substrate is subjected to large warping deformation, the manufacturing process of the panel is seriously influenced, and the quality fluctuation of the panel of the display device is caused. It has been found that the TFT warpage can be offset by a certain curvature (abbreviated as BOW) of the glass substrate. That is, maintaining a uniform shape of the BOW during the manufacturing of the glass substrate is advantageous for the warping during the TFT production process.

With the continuous development of liquid crystal display technology, G8.5 and higher generation substrate glass will become mainstream, and the product thickness also gradually develops from 0.7mm to 0.4mm or even thinner glass, the plate width is wider and faster, and the requirements of TFT panels on the glass surface quality such as stress and warpage are higher and higher. In the process of forming and producing the substrate glass, the buckling deformation mainly occurs in an annealing cooling section, the glass is in a transition region from viscoelasticity to elasticity at the moment and is influenced by the non-uniform temperature field, so that the BOW shape occurs, the glass is completely changed into an elastic state in a cutting region, the size and even the bending direction of the BOW shape are changed due to the pressed cutting, the buckling deformation of the annealing region is directly influenced, the fluctuation of the production quality is seriously caused, and the BOW production control difficulty of the substrate glass is increased.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a device and a method for controlling the forming curvature of substrate glass, so that the consistency and the stability of the BOW direction of the glass plate in a furnace are ensured.

The invention is realized by the following technical scheme:

a device for controlling the forming curvature of substrate glass comprises a first baffle, a second baffle and a third baffle, wherein the first baffle is positioned between a thickness forming area and a stress annealing area of a substrate glass forming device, the second baffle is positioned between the stress annealing area and a BOW-shaped control area, and the third baffle is positioned between the BOW-shaped control area and a plate breaking and cutting area;

a pressure control device is arranged between the second baffle and the third baffle;

the first baffle, the second baffle and the third baffle can be close to or far away from the substrate glass;

one side of the chopping block strip in the severing plate cutting area, which is contacted with the glass, is set to be an arc-shaped surface.

Preferably, the first baffle, the second baffle and the third baffle comprise two parts, and the two parts of any baffle are arranged along the two sides of the substrate glass conveying channel in a mirror symmetry mode.

Preferably, a plurality of heating devices are symmetrically arranged between the second baffle plate and the third baffle plate and on two sides of the substrate glass conveying channel.

Preferably, a plurality of the pressure control devices are symmetrically arranged on two sides of the transmission channel of the substrate glass.

Preferably, a pressurizing and air-inlet device is arranged on one side of the pressure control device, which is far away from the substrate glass conveying channel.

Preferably, the pressure control device is provided with a pressure relief device on one side far away from the substrate glass transmission channel.

Preferably, a pressure monitoring unit is arranged on the pressure relief device.

Preferably, the arc-shaped surface of the anvil strip is attached to the BOW shape of the substrate glass in this region.

A control method for controlling the forming curvature of substrate glass by a substrate glass forming curvature control device adopts the device, and comprises the following processes:

when the glass flows down from the brick tip and converges into the thickness forming area, the first baffle plates arranged at two sides of the substrate glass transmission channel are synchronously adjusted to enable the first baffle plates to be close to or far away from the substrate glass, and the temperature at two sides of the substrate glass is larger than the softening point of the glass;

when the glass enters the stress annealing area, synchronously adjusting second baffles arranged at two sides of the substrate glass transmission channel to enable the second baffles to be close to or far away from the substrate glass, and enabling the temperature at two sides of the substrate glass to be between the annealing point and the strain point of the glass;

when the glass enters the BOW type control area, synchronously adjusting third baffles arranged at two sides of the substrate glass transmission channel to enable the third baffles to be close to or far away from the substrate glass, controlling the temperature at two sides of the substrate glass, and adjusting a pressure control device to enable two sides of the substrate glass to keep constant pressure difference;

when the glass enters the severing zone, the arc-shaped surface of the anvil plate strip is contacted with the substrate glass, and the curvature control in the forming process of the substrate glass is completed.

Preferably, the heating means is adjusted to maintain a constant pressure differential across the substrate glass as it enters the BOW control zone.

Compared with the prior art, the invention has the following beneficial technical effects:

the utility model provides a glass board both sides form the invariable pressure differential in the stove to the precision control to the shaping crookedness of base plate glass has been realized to the different parts that set up different in base plate glass forming device's different regions to the glass board BOW type's in the stove stability has been guaranteed. Meanwhile, the arc-shaped anvil plate strip is adopted in the outlet cutting area to be close to the glass plate for cutting, so that the shaking of the glass plate during cutting is reduced, and the consistency of the BOW direction of the glass plate is kept. The device reasonable in design, the simple operation has effectively guaranteed the stability and the uniformity of base plate glass shaping crookedness.

Furthermore, the plurality of heating devices can further control the space temperature on two sides of the glass when the glass is in the BOW type control area, and further fully control the environmental pressure on two sides of the glass.

Further, the boost intake device facilitates increasing the pressure of the corresponding region.

Further, the pressure relief device facilitates pressure reduction in the corresponding area.

Furthermore, the pressure monitoring unit is convenient for monitor the pressure of glass both sides for the pressure control of glass both sides is more accurate.

Furthermore, the arc-shaped surface of the anvil plate strip is attached to the BOW type of the substrate glass in the area, so that the consistency of the substrate glass can be effectively guaranteed.

According to the method for controlling the forming curvature of the substrate glass, the temperatures of two sides of the substrate glass are controlled by sequentially adjusting the first baffle, the second baffle and the third baffle of the control system, and the pressure control device is adjusted to ensure that the two sides of the substrate glass keep constant pressure difference when the glass enters a BOW-shaped control area. And when the glass enters the severing area, the arc-shaped surface of the anvil plate strip is contacted with the substrate glass. The method effectively ensures the stability and consistency of the substrate glass in the forming process.

Furthermore, the control of the pressure at two sides of the substrate glass can be realized by adjusting the heating device of the BOW type control area, so that the adjusting method is flexible and changeable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic top cross-sectional view of a BOW-type control area according to the present invention;

FIG. 3 is a schematic diagram illustrating a cutting process of a severing zone of a prior art severing plate;

fig. 4 is a schematic diagram of the cutting process of the severing zone of the present invention.

Wherein: 1. the device comprises a first baffle, a second baffle, a third baffle, a heating device, a pressure control device, a pressurizing air inlet device, a pressurizing device, a pressure relief device, a pressurizing air inlet device, a pressure relief gas, 6, overflow bricks, 71, viscous glass, 72, viscoelastic glass plates, 73, annealed elastic glass plates, 74, cut separation glass plates, 81, cooling air pipes, 82, cooling air, 83, a high-heat-conductivity box body, 9, an annealing area heating device, 101, anvil strip in the prior art, 102, anvil strip, 103, cutting cutter wheels, 11 and clamping rollers.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention is described in further detail below with reference to the accompanying drawings:

as shown in fig. 1, a substrate glass forming curvature control device includes a first baffle 1, a second baffle 2 and a third baffle 3 respectively disposed between a thickness forming area and a stress annealing area, between the stress annealing area and a BOW-shaped control area, and between the BOW-shaped control area and a severing cutting area of a substrate glass forming device; first baffle 1, second baffle 2 and third baffle 3 all include two parts, and the two parts of every baffle set up along substrate glass transmission path's both sides mirror symmetry.

A plurality of heating devices 4 are symmetrically arranged between the second baffle 2 and the third baffle 3 and on two sides of the substrate glass transmission channel;

a plurality of pressure control devices 5 are symmetrically arranged between the second baffle 2 and the third baffle 3 and on two sides of the transmission channel of the substrate glass; the pressure control device 5 is provided with a pressure boosting air inlet device 51 and a pressure relief device 52 on one side far away from the substrate glass transmission channel, and the pressure relief device 52 is provided with a pressure monitoring unit.

The first baffle plate 1, the second baffle plate 2 and the third baffle plate 3 can be close to or far away from the substrate glass;

as shown in FIG. 3, the anvil lath 101 of the prior art is linear, and when the glass sheet is adjacent to the annealed elastic glass sheet 73, because the glass sheet has a BOW shape, the glass sheet cannot be completely adjacent to the middle of the glass sheet, and when the cutter wheel 103 presses the annealed elastic glass sheet 73, the BOW shape of the glass sheet changes, and even is transferred upwards to the annealing area, which directly affects the change of the annealing warpage and stress.

As shown in fig. 4, the side of the cutting board strip 102 in the severing zone of the present invention contacting with the glass is set to be an arc surface, preferably, the arc surface of the cutting board strip 102 completely fits with the BOW of the substrate glass in the area, and the cutting does not generate the shaking or BOW inversion caused by the cutting pressure.

The method for controlling the forming curvature of the substrate glass by adopting the control device comprises the following steps:

as shown in figure 1, the substrate glass forming equipment is divided into different areas according to different states of glass, wherein an area A is an overflow area, molten glass, namely viscous glass 71 flows down from two sides of an overflow brick 6 and is converged at the brick tip, and the area generally does not change the pressure in the furnace due to the good sealing performance of the equipment, and even if the pressure changes, the overflow state of the viscous glass 71 does not change greatly. After the glass flows down from the brick tip and is converged, the left and right first baffle plates 1 are synchronously adjusted to be close to the viscoelastic state glass plate 72, and the temperatures of the BL and BR areas are observed to be above the softening point. After the original thickness of the glass sheet is obtained, the air volume of the cooling air 82 is adjusted according to the distribution of the thickness in the non-flow direction until the thickness distribution enters the specification.

The area B is a thickness forming area, cooling devices are respectively arranged on two sides of the glass plate, cooling air 82 enters the high-heat-conductivity box body 83 through the cooling air pipe 81 to cool the viscous glass 71, and the flow state of the glass plate is changed to ensure the consistency of the thickness. Because the pressure in the furnace in the B zone is generally higher than that in the C zone and lower than that in the C zone due to the entering of the cooling air 82, the cooling air on the two sides of the glass plate is generally kept with equal air input, so the pressure in the BL and BR zones in the furnace is basically equal, and the shape of the viscous state glass 71 in the zone is generally not changed.

The region C is a stress annealing region, the state of the glass plate is viscoelastic, and when the viscoelastic state glass plate 72 is reduced from the annealing point to the strain point or below, the movement of mass points in the glass is changed dramatically until the mass points are in a relative equilibrium state, so that the pressure in the furnace in the region is required to ensure a stable state, namely the internal pressures of CL and CR are equal and constant. The space environment of independent areas CL and CR is ensured by adjusting the position of the second baffle plate 2 relative to the glass plate, the temperature of the areas CL and CR is observed, the temperature is between an annealing point and a strain point, the environmental pressure balance of the left side and the right side of the area C in the furnace is ensured, and then the distribution state of the stress is changed by adjusting the heating device 9 of the annealing area according to the distribution state of the stress of the whole plate until the stress distribution enters the specification.

The D area is a BOW type control area, the state of the glass plate in the area is an elastic state, and the two end parts of the elastic glass plate 73 after annealing are clamped and pulled by the clamping rollers 11, so that the flow direction speed of the glass plate can be ensured by the clamping rollers 11. When the pressure in the furnace changes, i.e., the pressures in the DL and DR regions are unequal, the glass sheet is bent to the side with smaller pressure by the pressure, i.e., the BOW changes.

As shown in FIG. 2, by observing the D-zone in-furnace pressure monitoring device, when the DL pressure is greater than the standard value, the annealed elastic glass sheet 73 undergoes the illustrated BOW-type change when the DL pressure is greater than the DR zone. Can be adjusted by: in the first method, the DL side pressure relief device 52 is adjusted to reduce the internal pressure of the DL; secondly, a heated gas, namely a pressurized gas 53, which is generally nitrogen or other inert gases, is input through a DR side pressurization air inlet device 51, so that the internal pressure of the DR is increased, and the stress difference between the DL and the DR is kept constant; and the method III is to adjust a DR side heating device 4 which can be independently controlled and change the pressure distribution of the left and right glass plates by adjusting the ambient temperature of the left and right sides. In the embodiment, the temperature in the DR side furnace is increased, so that the purpose of constant pressure difference between DL and DR can be achieved; in the fourth method, the size of the environmental pressure on the left side and the right side in the D-zone furnace can be changed by adjusting the gap between the movable baffle 43 and the annealed elastic glass plate 73.

The area E is a severing zone, when the annealed elastic glass plate 73 flows downwards out of the area D and enters the area E at a certain height, the clamping roller 11 is always in a clamping state, the cutting board strip 102 moves and is attached to one side of the annealed elastic glass plate 73 and synchronously descends with the glass plate, and in the descending process, the cutting knife wheel 103 slides across the glass plate at a certain speed (the horizontal and longitudinal combined speeds) and is tightly attached to the arc-shaped cutting board strip, so that the shaking and the change of the BOW shape cannot be caused. And then the separated glass plate 74 after cutting is stably separated from the mother plate by sucking and finishing the plate-breaking action through a sucking disc.

After the scribing action is finished, the cutting board strip 102 is still attached to the cut separation glass plate 74, the cut separation glass plate 74 is adsorbed by the sucking disc and is bent towards one side of the cutting board strip, the board breaking action is finished, and after the cut separation glass plate 74 is completely separated from the mother board, the cutting board strip 102 returns to the original position and carries out the next action.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The device for controlling the forming curvature of the substrate glass is characterized by comprising a first baffle (1), a second baffle (2) and a third baffle (3), wherein the first baffle (1) is positioned between a thickness forming area and a stress annealing area of the substrate glass forming device, the second baffle (2) is positioned between the stress annealing area and a BOW-shaped control area, and the third baffle (3) is positioned between the BOW-shaped control area and a plate breaking and cutting area;

a pressure control device (5) is arranged between the second baffle plate (2) and the third baffle plate (3);

the first baffle (1), the second baffle (2) and the third baffle (3) can be close to or far away from the substrate glass;

one side of the chopping board strip (102) in the chopping board cutting area, which is contacted with the glass, is set to be an arc-shaped surface.

2. The device for controlling the forming curvature of the substrate glass according to claim 1, wherein the first baffle plate (1), the second baffle plate (2) and the third baffle plate (3) comprise two parts, and the two parts of any baffle plate are arranged along two sides of the substrate glass conveying channel in a mirror symmetry mode.

3. The device for controlling the forming curvature of the substrate glass according to claim 1, wherein a plurality of heating devices (4) are symmetrically arranged between the second baffle plate (2) and the third baffle plate (3) and on two sides of a substrate glass conveying channel.

4. The device for controlling the degree of curvature of a substrate glass according to claim 1, wherein a plurality of the pressure control devices (5) are symmetrically arranged on both sides of a transmission channel of the substrate glass.

5. The device for controlling the formed curvature of substrate glass according to claim 1, wherein a pressurizing and air-intake device (51) is provided on the pressure control device (5) on a side away from the substrate glass conveying passage.

6. The device for controlling the formed curvature of substrate glass according to claim 1, wherein a pressure relief device (52) is arranged on the side of the pressure control device (5) far away from the substrate glass conveying channel.

7. The device for controlling the formed curvature of substrate glass according to claim 6, wherein a pressure monitoring unit is arranged on the pressure relief device (52).

8. The device for controlling the formed BOW of a substrate glass according to claim 1, wherein the curved surface of the anvil strip is disposed in abutment with a BOW profile of the substrate glass in the region.

9. A method of controlling a formed curvature of a substrate glass by using the device for controlling a formed curvature of a substrate glass according to any one of claims 1 to 8, characterized by comprising the steps of:

when the glass flows down from the brick tip and converges into the thickness forming area, the first baffle plates (1) arranged at two sides of the substrate glass transmission channel are synchronously adjusted, so that the first baffle plates (1) are close to or far away from the substrate glass, and the temperature at two sides of the substrate glass is higher than the softening point of the glass;

when the glass enters the stress annealing area, synchronously adjusting second baffles (2) arranged at two sides of the substrate glass transmission channel to enable the second baffles (2) to be close to or far away from the substrate glass and enable the temperature at two sides of the substrate glass to be between the annealing point and the strain point of the glass;

when the glass enters the BOW type control area, synchronously adjusting third baffle plates (3) arranged at two sides of the substrate glass transmission channel to enable the third baffle plates (3) to be close to or far away from the substrate glass, controlling the temperature at two sides of the substrate glass, and adjusting a pressure control device (5) to enable two sides of the substrate glass to keep constant pressure difference;

10. The method for controlling the formed BOW of a substrate glass according to claim 9, wherein the heating device (4) is adjusted to maintain a constant pressure difference across the substrate glass as the glass enters the BOW control zone.