CN110963677A - Forming method and forming device for multi-curved-surface glass - Google Patents
Forming method and forming device for multi-curved-surface glass Download PDFInfo
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- CN110963677A CN110963677A CN201811162150.7A CN201811162150A CN110963677A CN 110963677 A CN110963677 A CN 110963677A CN 201811162150 A CN201811162150 A CN 201811162150A CN 110963677 A CN110963677 A CN 110963677A
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- forming
- area
- glass
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- mold
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/025—Re-forming glass sheets by bending by gravity
- C03B23/0258—Gravity bending involving applying local or additional heating, cooling or insulating means
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/035—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending
- C03B23/0352—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet
- C03B23/0357—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet by suction without blowing, e.g. with vacuum or by venturi effect
Abstract
The invention provides a forming method of multi-curved-surface glass, which comprises the following steps: the forming furnace comprises a conveying mechanism, an interaction zone, a heating zone, a forming zone and a cooling zone; a plurality of moulds are placed in each functional area, the moulds are made of porous materials, and the moulds are provided with grooves or bosses which are used for copying the outer surfaces of the multi-curved-surface glass; feeding the glass substrate onto a mold in the glass substrate through the interaction area; the heating zone heats the glass substrate to a set temperature; the forming area continues to heat the glass substrate; the air pump is communicated with the forming area to vacuumize the forming area so that air enters the air pump through the through hole of the mold; cooling the glass substrate in the cooling area to obtain multi-curved-surface glass; and taking the multi-curved glass out of the mold in the cooling area. The gas is discharged from the through hole of the die, the gas is uniformly discharged, the through hole is a tiny hole, and no through hole mark is left when the glass substrate is molded, so that the surface quality of the multi-curved-surface glass molding is improved.
Description
Technical Field
The invention relates to a glass forming method, in particular to a forming method of multi-curved-surface glass, and also relates to a forming device of the multi-curved-surface glass.
Background
In recent years, curved glass has been applied to display panels of electronic devices. At present, the hot-pressing molding of a punch-die is generally adopted in the industry. The glass substrate is put into a concave mould, then the concave mould is covered with a convex mould, and then the glass substrate is put into a hot pressing furnace and heated. The glass substrate becomes soft with increasing temperature. Under the drive of the pressure applied by the male die, the glass substrate is deformed and attached between the female die and the male die, and finally, the glass substrate is cooled and formed. The curved glass is required to be contacted with the surface of a mould during the forming process, so that the roughness of the concave curved surface and the convex curved surface of the formed curved glass is larger. And the curved surface of the glass is formed depending on the shape of the die, and the existing male die and female die are difficult to form a plurality of complex curved surfaces.
Disclosure of Invention
In view of the above, it is necessary to provide a method for forming a multi-curved glass.
The invention provides a forming method of multi-curved-surface glass, which comprises the following steps:
providing a forming furnace with a sealed cavity and at least one mold, wherein the forming furnace comprises a conveying mechanism and a plurality of relatively independent functional areas, the functional areas comprise an interaction area, a heating area, a forming area and a cooling area which are sequentially arranged in the forming furnace, the interaction area can be alternately communicated with the sealed cavity of the forming furnace and the outside, the mold is made of a porous material, and the mold is provided with a groove or a boss which is used for copying the outer surface of the multi-curved glass;
feeding, namely providing a glass substrate, and feeding the glass substrate onto the mold in the interaction area;
heating, transferring the mold from the interaction area to the heating area through the conveying mechanism, wherein the heating area heats the glass substrate to a set temperature so as to soften and deform the glass substrate;
forming, namely transferring the mold from the heating area to the forming area through the conveying mechanism, continuously heating the glass substrate in the forming area to enable the glass substrate to reach the forming temperature, providing an air extractor, wherein the air extractor is communicated with the forming area, vacuumizing the forming area by the air extractor, and adsorbing the glass substrate on the surface of the mold;
cooling, transferring the mold from the molding area to the cooling area through the conveying mechanism to cool the glass substrate and demolding to obtain the multi-curved-surface glass;
and discharging, namely transferring the mold from the cooling area to the interaction area through the conveying mechanism, and taking the multi-curved-surface glass out of the mold.
The invention also provides a forming device of the multi-curved glass, which comprises at least one mould, a forming furnace with a sealed cavity and an air pump, wherein the mould is made of porous materials, the mould is provided with a groove or a boss which is imitated to the outer surface of the multi-curved glass, the mould is used for bearing a glass substrate and is placed in the forming furnace, the forming furnace comprises a conveying mechanism and a plurality of relatively independent functional areas, the conveying mechanism is used for conveying the mould from one functional area to the next functional area, the functional areas comprise an interaction area, a heating area, a forming area and a cooling area which are sequentially arranged in the forming furnace, the interaction area can be alternately communicated with the sealed cavity and the outside of the forming furnace, the heating area is used for heating the glass substrate, the forming area is communicated with the air pump, the air pump pumps the forming area to enable the glass substrate to be adsorbed on the surface of the mould to form the multi-curved glass, the cooling area is used for cooling the multi-curved glass.
By adopting the forming method of the multi-curved-surface glass, the forming area can directly utilize the through hole of the forming area due to the material property of the mould, and the air pump is adopted to vacuumize the through hole so as to exhaust the air between the mould and the glass substrate. Because the gas is exhausted from the through hole of the die, the gas is exhausted uniformly, so that the glass plate substrate is not easy to deform in the bending process. The mold can directly profile multiple curved surface glass design, and has simple structure and high precision. The forming method of the multi-curved-surface glass solves the problem that the glass with a complex shape and a plurality of curved surfaces is difficult to process and form by using a male die and a female die in a hot pressing mode. On the other hand, because the through hole of the mould is a tiny hole, no through hole trace is left when the glass substrate is formed, and the roughness of the mould is small, so that the surface quality of multi-curved-surface glass forming is improved.
Drawings
Fig. 1 is a flowchart of a method for forming a multi-curved glass according to an embodiment of the present invention.
Fig. 2 is a schematic view of a forming furnace according to an embodiment of the present invention.
Fig. 3 is a schematic perspective view of a mold according to an embodiment of the present invention.
Fig. 4 is a cross-sectional view taken along line IV-IV of the mold shown in fig. 3, with a glass substrate placed thereon.
Fig. 5 is a cross-sectional view of the mold and the multi-curved glass after the glass substrate shown in fig. 4 is molded.
Description of the main elements
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 2 to 4, in the method for forming the multi-curved glass 500 according to the embodiment of the invention, a forming device (not shown) for forming the multi-curved glass 500 from the glass substrate 400 is provided. The forming device for multi-curved glass comprises a forming furnace 100, at least one mould 200 and an air extractor 300. In the present embodiment, the thickness of the glass substrate 400 is 0.6 to 1.2 mm, but not limited thereto.
Referring to fig. 2, the forming furnace 100 has a structure with a sealed cavity. The forming furnace 100 includes a conveying mechanism (not shown) and a plurality of relatively independent functional zones 10, 20, 30, 40. In this embodiment, the number of the molds 200 is plural, and the molds are respectively placed in the functional regions 10, 20, 30, and 40. The plurality of functional zones 10, 20, 30, 40 includes an interaction zone 10, a heating zone 20, a forming zone 30, and a cooling zone 40, which are sequentially disposed within the forming furnace 100. In this embodiment, each functional zone 10, 20, 30, 40 is substantially sequentially arranged in a ring shape such that the interaction zone 10 and the cooling zone 40 are adjacent. The interactive area 10 can be alternately communicated with the sealed cavity of the forming furnace 100 and the outside to ensure that the sealed cavity in the forming furnace 100 is in a sealed state when the glass substrate 400 is put in and the formed multi-curved glass 500 is taken out. The transport mechanism is capable of simultaneously transporting the mold 200 in each functional zone 10, 20, 30, 40 to the next functional zone 10, 20, 30, 40. In this embodiment, the transfer mechanism rotationally transfers the mold 200 in each functional zone 10, 20, 30, 40 to the next functional zone 10, 20, 30, 40 in the direction a. Specifically, the molds 200 of the interaction zone 10 are transferred to the heating zone 20, the molds 200 of the heating zone 20 are transferred to the molding zone 30, the molds 200 of the molding zone 30 are transferred to the cooling zone 40, and the molds 200 of the cooling zone 40 are transferred to the interaction zone 10 every time the transfer mechanism is operated. The steps of feeding, heating, forming, cooling and blanking are synchronously carried out in the forming furnace.
It is understood that in other embodiments, the interactive zone 10 may be divided into two separate functional zones: a feeding area and a discharging area. The feeding zone, the heating zone 20, the molding zone 30, the cooling zone 40, and the discharging zone are sequentially arranged, and at this time, the transfer mechanism moves the transfer mold 200.
It is understood that in other embodiments, the number of the mold 200 may be one, and the transfer mechanism transfers one mold 200 from one functional area to the next.
Referring to fig. 3, the mold 200 is made of a porous material. In this embodiment, the mold 200 is made of graphite, but not limited thereto. In other embodiments, the material of the mold 200 may also be ceramic. The graphite has the characteristics of small roughness and high temperature resistance, and the graphite has a plurality of tiny through holes 207.
The mold 200 is provided with a carrying surface 201, and the carrying surface 201 is used for placing the glass substrate 400. In this embodiment, the carrying surface 201 is provided with a first groove 203 and a second groove 205 which are formed by profiling the outer surface of the multi-curved glass 500, but not limited thereto. Since the material of the mold 200 is porous, the first recess 203 and the second recess 205 have a plurality of through holes 207. It is understood that in other embodiments, the mold 200 may also be provided with projections and/or grooves according to the multi-curved glass 500 after molding, and the number of the projections and/or grooves is set according to the curved surface of the multi-curved glass 500. In this embodiment, one mold 200 is used to place one glass substrate 400, but is not limited thereto.
Referring to fig. 1, the method for forming the multi-curved glass 500 includes the following steps:
step S101, providing the forming furnace 100 and at least one mold 200.
And step S102, cleaning.
First, the sealing chamber of the forming furnace 100, the mold 200 and the glass substrate 400 are cleaned to improve the forming quality of the glass substrate 400.
Wherein the cleaning of the sealed cavity of the forming furnace 100 includes cleaning the sealed cavity of each functional area 10, 20, 30, 40 and cleaning the sealed cavity in the forming furnace 100 between each functional area 10, 20, 30, 40.
And step S103, vacuumizing and filling protective gas.
The sealed cavity of the forming furnace 100 is evacuated and then filled with a protective gas to prevent oxidation of the forming furnace 100 and the mold 200. In this embodiment, the shielding gas is nitrogen, but is not limited thereto.
And step S104, feeding.
Providing a glass substrate 400, and feeding the glass substrate 400 onto a carrying surface 201 of a mold 200 placed in an interaction zone 10 through the interaction zone 10;
and step S105, heating.
The mold 200 is transferred from the interactive zone 10 to the heating zone 20 by the transfer mechanism to heat the glass substrate 400 to a set temperature to soften and deform. Wherein, the heating zone 20 adopts a power control mode to perform multi-stage heating. Heating is carried out until the temperature of each section is higher than that of the previous section, and the temperature is increased to the set temperature in a gradient manner. In this embodiment, the multi-stage heating is specifically divided into three stages, and the heating zones 20 are specifically provided with three relatively independent heating zones 20 along the direction a: a first heating zone 21, a second heating zone 23, and a third heating zone 25, but is not limited thereto. The first heating zone 21, the second heating zone 23, and the third heating zone 25 are sequentially disposed between the interactive zone 10 and the forming zone 30, and are independently heated to reach a predetermined temperature therein. The heating time is set according to the thickness of the glass substrate 400.
In this embodiment, the heating zone 20 is power controlled to control the temperature of its capsule, and a pyrometer (not shown) is provided in communication with it to monitor the actual temperature of its capsule. The power is adjusted to control the temperature within the sealed cavity of the heating zone 20 by observing the pyrometer temperature change.
In this embodiment, the first heating zone 21, the second heating zone 23, and the third heating zone 25 are set to have temperatures of 250-350 ℃, 350-650 ℃, 650-850 ℃. It is understood that in other embodiments, the multi-stage heating may be divided into five or other stages.
It is understood that in other embodiments, the heating region 20 may also control the temperature of its capsule in a temperature-controlled manner.
And step S106, molding.
Referring to fig. 2, the mold 200 is transferred from the heating zone 20 to the forming zone 30 by the transfer mechanism, and is continuously heated until the sealed cavity of the forming zone 30 reaches the forming temperature. In this embodiment, the molding temperature is 850-950 ℃.
Referring to fig. 4 and 5, an air pump 300 is provided. The air extractor 300 is in communication with the molding zone 30. The suction machine 300 vacuums the molding zone 30 so that the gas between the glass substrate 400 and the mold 200 enters the suction machine 300 through the through hole 207, and the glass substrate 400 is adsorbed on the surface of the mold 200 to form the multi-curved glass 500, as shown in fig. 5.
In this embodiment, the vacuum pressure is 0.1-0.5 MPa and the vacuum time is 150-200 s. The evacuation pressure and evacuation time are adjusted according to the thickness of the glass substrate 400.
And step S105, cooling.
From the forming zone 30 to the cooling zone 40 by a transfer mechanism to cool and de-mold the glass substrate 400 to obtain the multi-curved glass 500.
Referring to fig. 1, in the present embodiment, a sectional cooling is adopted, that is, the temperature of each section is lower than that of the previous section in a gradient manner. In this embodiment, the multi-stage cooling is specifically divided into three stages, and the cooling zone 40 is specifically provided with three relatively independent cooling zones 40 along the direction a: a first cooling zone 41, a second cooling zone 43, and a third cooling zone 45, but is not limited thereto. The first cooling zone 41, the second cooling zone 43 and the third cooling zone 45 are sequentially disposed between the forming zone 30 and the interaction zone 10, and are independently cooled to reach a set temperature inside thereof, respectively. The cooling time is set according to the thickness of the glass substrate 400.
In this embodiment, the set temperatures of the first cooling zone 41, the second cooling zone 43 and the third cooling zone 45 are 950 to 600 ℃, 600 to 300 ℃ and 300 to 100 ℃, respectively. It is understood that in other embodiments, the multi-stage cooling may be divided into five or other stages.
In this embodiment, the first cooling zone 41 of the sectional cooling adopts a non-direct liquid cooling mode, and the second cooling zone 43 and the third cooling zone 45 adopt a direct liquid cooling mode.
And step S105, blanking.
The mold 200 is transferred from the cooling zone 40 to the interaction zone 10 by a transfer mechanism. The multi-curved glass 500 is taken out of the mold 200 for subsequent processes of polishing, tempering, etc.
It is understood that the interactive zone 10 can also heat or cool the mold 200 and the multi-curved glass 500 to increase the cooling efficiency, thereby reducing the time consumed for forming the multi-curved glass 500 in the forming furnace 100.
By using the method for molding the multi-curved glass of the present invention, the molding region 30 can directly use its own through hole 207 due to the material properties of the mold 200, and the air pump 300 is used to evacuate the through hole to exhaust the air between the mold 200 and the glass substrate 400. Since the gas is exhausted from the through holes 207 of the mold 200 itself, the exhaust is uniform, so that the glass substrate 400 is not easily deformed during the bending process. The mold 200 can directly profile the outer surface design of the multi-curved glass 500, and has a simple structure and high precision. The forming method of the multi-curved-surface glass solves the problem that the glass with a complex shape and a plurality of curved surfaces is difficult to process and form by using a male die and a female die in a hot pressing mode. On the other hand, since the through hole 207 of the mold 200 is a tiny hole, no trace of the through hole 207 is left when the glass substrate 400 is molded, and the roughness of the mold 200 is small, thereby improving the surface quality of the multi-curved glass 500.
Finally, it should be noted that the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A forming method of multi-curved-surface glass comprises the following steps:
providing a forming furnace with a sealed cavity and at least one mold, wherein the forming furnace comprises a conveying mechanism and a plurality of relatively independent functional areas, the functional areas comprise an interaction area, a heating area, a forming area and a cooling area which are sequentially arranged in the forming furnace, the interaction area can be alternately communicated with the sealed cavity of the forming furnace and the outside, the mold is made of a porous material, and the mold is provided with a groove or a boss which is used for copying the outer surface of the multi-curved glass;
feeding, namely providing a glass substrate, and feeding the glass substrate onto the mold in the interaction area;
heating, transferring the mold from the interaction area to the heating area through the conveying mechanism, wherein the heating area heats the glass substrate to a set temperature so as to soften and deform the glass substrate;
forming, namely transferring the mold from the heating area to the forming area through the conveying mechanism, continuously heating the glass substrate in the forming area to enable the glass substrate to reach the forming temperature, providing an air extractor, wherein the air extractor is communicated with the forming area, vacuumizing the forming area by the air extractor, and adsorbing the glass substrate on the surface of the mold;
cooling, transferring the mold from the molding area to the cooling area through the conveying mechanism to cool the glass substrate and demolding to obtain the multi-curved-surface glass;
and discharging, namely transferring the mold from the cooling area to the interaction area through the conveying mechanism, and taking the multi-curved-surface glass out of the mold.
2. The method of forming a multi-curved glass as defined in claim 1, wherein: the material of the mould is graphite.
3. The method of forming a multi-curved glass as defined in claim 1, wherein: in the heating step, multi-stage heating is adopted, and the temperature of each stage is increased to the set temperature in a gradient manner in a manner that the temperature of the stage is higher than that of the previous stage.
4. The method of forming a multi-curved glass as defined in claim 1, wherein: the number of the moulds is multiple, and the moulds are respectively arranged in the functional areas so that the steps of feeding, heating, forming, cooling and blanking can be synchronously carried out in the forming furnace.
5. The method for forming a multi-curved glass according to claim 1, wherein in the forming step, the forming parameters are: the molding temperature is 850-950 ℃, and the vacuum pressure is 0.1-0.5 MPa.
6. The method of forming a multi-curved glass as defined in claim 1, wherein: in the step of cooling, sectional cooling is adopted, and the temperature of each section is reduced in a gradient manner in a manner that the temperature of the section is lower than that of the previous section.
7. The method of forming a multi-curved glass as defined in claim 6, wherein: in the step of the sectional cooling, firstly, a non-direct liquid cooling mode is adopted, and then, a direct liquid cooling mode is adopted.
8. The method of forming a multi-curved glass as defined in claim 1, wherein: before the step of feeding, the method also comprises the steps of vacuumizing a sealed cavity of the forming furnace to remove air and introducing protective gas.
9. The method of forming a multi-curved glass as defined in claim 1, wherein: before the step of feeding, the method also comprises the step of cleaning the forming furnace, the mould and the glass substrate.
10. The utility model provides a forming device of many curved surfaces glass which characterized in that: comprises at least one mould, a forming furnace with a sealed cavity and an air extractor, wherein the mould is made of porous materials, the mould is provided with a groove or a boss which is used for copying the outer surface of the multi-curved glass, the mould is used for bearing a glass substrate and is placed in the forming furnace, the forming furnace comprises a conveying mechanism and a plurality of relatively independent functional areas, the conveying mechanism is used for conveying the die from one functional area to the next functional area, the functional areas comprise an interaction area, a heating area, a forming area and a cooling area which are arranged in the forming furnace in sequence, the interactive zone can be alternately communicated with the sealed cavity of the forming furnace and the outside, the heating zone is used for heating the glass substrate, the forming area is communicated with the air pump, the air pump vacuumizes the forming area to enable the glass substrate to be adsorbed on the surface of the mold to form the multi-curved-surface glass, and the cooling area is used for cooling the multi-curved-surface glass.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811162150.7A CN110963677A (en) | 2018-09-30 | 2018-09-30 | Forming method and forming device for multi-curved-surface glass |
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| CN201811162150.7A CN110963677A (en) | 2018-09-30 | 2018-09-30 | Forming method and forming device for multi-curved-surface glass |
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Cited By (1)
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| CN111838843A (en) * | 2020-07-13 | 2020-10-30 | 界首市希捷仿真花卉有限公司 | Bionic forming method and device for ecological artificial flower |
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Application publication date: 20200407 |