CN115215535A - Apparatus and method for forming glass into curved shape - Google Patents
Apparatus and method for forming glass into curved shape Download PDFInfo
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- CN115215535A CN115215535A CN202111325662.2A CN202111325662A CN115215535A CN 115215535 A CN115215535 A CN 115215535A CN 202111325662 A CN202111325662 A CN 202111325662A CN 115215535 A CN115215535 A CN 115215535A
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- glass
- lower mold
- glass plate
- glass sheet
- pressing
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- 239000011521 glass Substances 0.000 title claims abstract description 179
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000003825 pressing Methods 0.000 claims description 47
- 238000005452 bending Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 19
- 239000000835 fiber Substances 0.000 claims description 16
- 239000004744 fabric Substances 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229920006231 aramid fiber Polymers 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000004760 aramid Substances 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 8
- 238000005553 drilling Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 239000002184 metal Substances 0.000 description 5
- 230000035939 shock Effects 0.000 description 5
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002759 woven fabric Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004554 molding of glass Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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Classifications
-
- 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
-
- 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
- C03B23/0256—Gravity bending accelerated by applying mechanical forces, e.g. inertia, weights or local forces
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
The invention provides a glass curved surface forming device and a method thereof, which realize the complex curved surface of glass and the formed optical mirror surface by the arrangement of a drilling roller structure and an infrared heater. The glass curve forming device is characterized in that the plurality of infrared heaters are arranged in parallel along the length direction relative to the upper surface of the lower die, and the plurality of infrared heaters arranged in parallel are controlled independently, so that the glass plate is formed with a predetermined curvature by making a desired position of the glass plate droop due to self weight.
Description
Technical Field
The present invention relates to an apparatus and a method for forming glass into a curved shape, and more particularly, to an apparatus and a method for forming glass into a curved shape to realize a complicated curved shape.
Background
With the development of multimedia, glasses used for display devices are required to have various shapes and curvatures. In particular, an automobile is provided with an information display device satisfying HMI (Human Machine Interface), and a vehicle-mounted navigation system, an audio device, and the like have a remarkable degree of popularity, and there are display devices for vehicle-mounted displaying images and images provided by these devices. In order to realize such a vehicle-mounted display device or the like with a thin glass plate, more complicated curving is required. Further, the glass is required to have a complex curvature and to have an optical mirror surface after molding.
Generally, as a method for forming glass for automobiles, there is a method of bending by gravity or press bending in which glass is heated to a softening point or higher and bent by gravity or press. In particular, in the molding of glass bent deeply or glass formed into a horseshoe shape, a press molding method is used. The invention of patent document 1 proposes a method of press bending a glass sheet under a press bending condition in which, in a press bending forming method in which press bending is performed using a mold, a stress generated in the glass sheet by the press bending is calculated, the stress obtained by the calculation of the stress is an in-plane compressive stress, and the press bending of the glass sheet is performed under a press bending condition in which the in-plane compressive stress is equal to or less than an allowable value calculated by a buckling theory. Such a molding method is excellent in production efficiency, but has a difficulty in achieving a complex curvature of glass in particular, and has a technical problem in forming a highly accurate optical mirror surface. Further, although it is possible to make the glass into a complicated curved surface by strongly pressing the upper and lower molds, the glass after molding is often clouded and whitish, and wrinkles are generated in the peripheral portion of the glass, and there is a problem that a high-precision optical mirror surface cannot be realized as expected unless it takes more time to polish the surface of the glass than after ordinary pressing. Further, the cost of a mold for molding glass for producing a Display device for vehicle use called CID (Center Information Display) and Cluster is enormous, and it is difficult to cope with curving of the glass.
As another method, a method of bending by a roll assembly is known. The invention of patent document 2 proposes a method of bending a glass sheet by conveying the glass sheet heated to the vicinity of the softening point in a heating furnace by a roller conveyor composed of a plurality of curved rollers. According to this method, since the softened glass sheet sags by its own weight, the glass sheet is bent in accordance with the curvature of the roller. In this case, the glass sheet is bent in a direction orthogonal to the conveying direction. The invention of patent document 3 proposes that in the roller assembly of patent document 2, the glass sheet is bent by pressing the glass sheet while moving the conveying roller up and down along with the conveyance of the glass.
However, in the method of patent document 1, it is necessary to replace the mold pattern with a roller having a curvature corresponding to the mold pattern, which takes time to replace, and it is necessary to prepare a roller having a curvature required for each mold pattern. Further, there is a problem that a strip-like roller deformation due to contact between the roller and the glass plate is formed in the vertical direction in the assembled state, and the strip-like deformation by the roller is easily noticeable. In addition, in the method of patent document 2 or 3, in the case of large-sized glass forming, a large number of conveying rollers need to be moved up and down, and there is a problem that not only is control complicated, but also damage to the glass sheet may occur. Further, in the methods of patent documents 1 to 3, it is difficult to cope with the complicated curvature of a relatively large glass used in an in-vehicle display device.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2005-154164
Patent document 2: specification of U.S. Pat. No. 4123246
Patent document 3: japanese laid-open patent publication No. 2000-72460
Patent document 4: japanese patent laid-open publication No. 2019-189512
Disclosure of Invention
Technical problem to be solved by the invention
In view of the above-described problems, the applicant of the present application has proposed a glass curve forming apparatus and a method thereof for achieving a complex curve of glass and an optical mirror surface after forming, in patent document 4. That is, a glass curve forming apparatus includes: a lower mold having a plurality of evacuated mold cavities, on which a glass sheet is placed with a desired curved surface formed; and one or more press rolls for pressing the glass in a desired bending direction, applying a pressing force while rotating along a desired bending surface of the lower mold in a state where the glass sheet heated to a bending forming temperature is placed on the lower mold, and evacuating the cavity in the lower mold where the one or more press rolls have just rotated, thereby forming the glass sheet into a prescribed curvature.
However, when the heated glass is pressed against the cooled roller, the glass is broken by thermal shock, and even if the roller is heated by a heater, the heated roller is deteriorated in operation due to thermal expansion of the metal. Further, there is also a problem that the softened glass is damaged by the metal roller being pressed against the glass. Further, even if the glass plate is heated by the infrared heater, there is a problem that a desired curvature cannot be obtained unless selective heating is performed on only a position where the glass plate is to be bent in a finer manner.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a glass curved surface forming apparatus and a method thereof, which can form a glass curved surface into a complex curved surface and can form an optical mirror surface after forming by means of a configuration of a grinding roll and an arrangement of infrared heaters.
Solution for solving the above technical problem
In order to solve the above-described problems, a glass curve forming apparatus according to the present invention includes a lower mold on which a glass sheet is placed and which has one or more mold cavities capable of evacuating the glass sheet, and a plurality of infrared heaters, wherein the plurality of infrared heaters are arranged in parallel in a longitudinal direction with respect to an upper surface of the lower mold, and the plurality of infrared heaters arranged in parallel are individually controlled to cause a desired position of the glass sheet to sag due to their own weight, thereby forming the glass sheet with a predetermined curvature.
The glass curve forming device of the invention comprises: a lower mold on which a glass sheet is placed and which has one or more mold cavities for evacuating the glass sheet; one or more press rolls that press the glass sheet in a desired bending direction; and a plurality of infrared heaters, wherein the outer peripheral surface of the press roller is covered with a heat-resistant cloth, the plurality of infrared heaters are arranged side by side in the longitudinal direction with respect to the upper surface of the lower mold, and the glass sheet is molded at a predetermined curvature by selectively heating any of the plurality of infrared heaters arranged side by side, which can heat a desired portion of the glass sheet placed on the lower mold.
The heat-resistant cloth may be a woven fabric of fibers selected from glass fibers, silica fibers, alumina fibers, and ceramic fibers. In addition, in view of heat resistance, processability, texture, and the like, the most suitable silica fiber cloth or aramid fiber is preferable. In addition, flame resistant fibers may also be selected. By applying these heat-resistant cloths to the outer peripheral surface of the roller, not only is no thermal shock generated, but also damage to the glass is prevented. Further, the roller is preferably made of metal or ceramic.
In the glass curved surface forming apparatus of the present invention, the pressing roller or rollers may be configured to apply the pressing force while rotating along the desired curved surface of the lower mold in a state where the desired portion of the glass sheet is heated to the bending forming temperature by the infrared heater. Further, the glass sheet may be formed with a predetermined curvature by evacuating the cavity immediately after the rotation of the one or more pressing rollers in the lower mold.
The method for forming a curved glass surface according to the present invention is characterized in that in a curved glass surface forming apparatus including a lower mold on which a glass sheet is placed and which has one or more cavities capable of evacuating the glass sheet, and a plurality of infrared heaters, the plurality of infrared heaters are arranged side by side in a longitudinal direction with respect to an upper surface of the lower mold, and the plurality of infrared heaters arranged side by side are individually controlled to cause a desired position of the heated glass sheet to sag due to its own weight along a curved surface of the lower mold, thereby forming the glass sheet with a predetermined curvature.
Further, a method for forming a curved glass surface according to the present invention is a method for forming a curved glass surface, comprising a lower mold having one or more mold cavities for placing a glass sheet thereon and performing evacuation, one or more press rolls for pressing the glass sheet provided above the lower mold in a desired bending direction, and a plurality of infrared heaters, the method comprising: placing the glass plate on a lower die; selectively heating a desired portion of the glass plate to a softening point at which the glass plate is bent by its own weight by an arbitrary infrared heater; a step of moving the infrared heater upward and then interposing the infrared heater and the glass plate between them by a pressing roller; and a step of rotating one or more press rolls along the curved surface of the lower mold at a desired portion of the glass sheet and applying a pressing force thereto.
Further, the method for forming a curved glass surface according to the present invention may further include, after the above step, the following step: and a molding step of forming the mold cavity with a predetermined curvature by evacuating the mold cavity of the lower mold immediately after the rotation of the one or more pressing rollers.
Effects of the invention
According to the method and the apparatus for forming a curved surface of glass of the present invention, the position at which the glass sheet is to be bent can be made to sag to the curved surface of the lower mold by its own weight by individually controlling the infrared heaters, which are the plurality of heating elements arranged in line. In addition, in the case of using a roller, by applying the heat-resistant cloth to the outer circumferential surface of the roller shaft, not only is no thermal shock generated, but also damage to the glass is prevented. Further, the glass can be made into a slightly complex curved surface, and the optical mirror surface after molding can be realized. Further, since the thickness and the bent shape of the glass sheet are also various, the bending by the press roller is flexible, and further, the cost is more excellent than the press forming by the upper mold and the lower mold.
Drawings
FIG. 1 is a schematic configuration diagram showing a glass curve forming apparatus 100 according to example 1 of the present invention.
Fig. 2 is a diagram showing a part of the roller device 20 of embodiment 1 of the present invention.
Fig. 3 is a flowchart showing a process in a case where the pressing roll 21 is not used in the method for forming a curved surface of glass according to example 1 of the present invention.
Fig. 4 is a diagram showing a case of curved surface forming of glass in a case where the pressing roll 21 is not used in the method of curved surface forming of glass in example 1 of the present invention.
Fig. 5 is a flowchart showing a process of curved surface forming of glass by rotation and pressing of the pressing roller 21 in the method of curved surface forming of glass according to example 1 of the present invention.
Fig. 6 is a diagram simply showing the rotation and pressing of the pressing roller 21 in the curved surface forming of the glass of embodiment 1 of the present invention.
Fig. 7 is a diagram simply showing the rotation and pressing of the pressing roller 21 following fig. 6 in the curved surface forming of the glass of example 1 of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same portions are denoted by the same reference numerals, and redundant description is omitted. It is also noted that the drawings are sometimes exaggerated and not necessarily drawn accurately to scale in order to understand the present invention. In addition, the present invention is not limited to the embodiments shown below.
[ example 1]
Embodiment 1 will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing a glass curve forming apparatus 100 according to example 1 of the present invention. This is explained in detail with reference to fig. 1. The glass curve forming apparatus 100 is generally configured by interconnecting a heating section 1 and a forming section 2, and has a lower mold 31 mounted on a mold base 30.
As shown in fig. 1, the heating unit 1 includes an infrared heater 11 and a heater support member 12. The infrared heater 11 may be supported by a heater supporting member 12 and driven up and down by servo control. Similarly, the forming section 2 may be configured such that the roller device 20 is provided on the rail body 23 and driven by servo control.
The plurality of infrared heaters 11 are arranged in parallel in the longitudinal direction with respect to the upper surface of the lower mold 31, and any infrared heater 11 that can heat a desired portion of the glass sheet placed on the lower mold 31 among the plurality of infrared heaters 11 arranged in parallel is selectively heated, whereby the glass sheet is formed with a predetermined curvature.
Fig. 2 is a diagram showing a part of the roller device 20 of embodiment 1 of the present invention. The roll apparatus 20 will be described in detail with reference to fig. 1 and 2 (a). The roller device 20 is substantially composed of a pressing roller 21 and a roller shaft 22. The pressing roller 21 is pivotally supported by the roller shaft 22 to be freely rotatable and is attached to the rail body 23, and is operated by a slide cylinder along the rail of the rail body 23. The control of pressure, speed and positioning, which are important molding conditions, is performed by a servo motor. The pressing roller 21 presses a glass sheet G placed on the lower mold 31, which will be described later, while rotating.
The pressing roller 21 may be made of heat-resistant metal or ceramic. In embodiment 1, a cylindrical body is used as the pressing roller 21, but a spherical body or a conical body may be used.
Refer to fig. 2 (b). The outer peripheral surface 210 of the pressing roller 21 is covered with a heat-resistant cloth 211. The heat-resistant cloth 211 may be a woven fabric of fibers selected from glass fibers, silica fibers, alumina fibers, and ceramic fibers. In addition, in view of heat resistance, processability, texture, and the like, the most suitable silica fiber or aramid fiber cloth is preferable. In addition, flame resistant fibers may also be selected. By applying these heat-resistant cloths 211 to the roller outer circumferential surface 210, not only is no thermal shock generated, but also damage to the glass is prevented.
The lower mold 31 is provided with a plurality of cavities for placing a glass plate thereon and for evacuating the glass plate. The material of the lower mold 31 is preferably metal or ceramic, and in the case of ceramic, it is preferably a material having fire resistance, excellent mirror surface properties after processing, and good releasability from glass at high temperatures.
Refer to fig. 3 and 4. Fig. 3 is a flowchart showing the steps in the case where the pressing roll 21 is not used in the method for forming a curved surface of glass according to example 1 of the present invention. Fig. 4 is a diagram showing a case of curved surface forming of glass in a case where the pressing roll 21 is not used in the method of curved surface forming of glass in example 1 of the present invention.
In the desired curved surface forming of the glass sheet, when the curvature is small, a lower mold 31 as shown in fig. 4 is used. In this case, the glass plate can be molded by being adhered to the curved surface of the lower mold 31 by its own weight by selective heating with an arbitrary infrared heater 11. In example 1, as shown in fig. 4, 12 infrared heaters (a, b, c, d, e, f, G, h, i, j, k, l) of the infrared heater 11 are arranged side by side above the lower mold 31 or the glass plate G placed thereon. The number of infrared heaters is not particularly limited, and may be appropriately determined in accordance with the size of the glass sheet to be formed and the design condition of the curved surface forming.
The process of fig. 3 will be described with reference to fig. 4. First, as shown in fig. 4 (a), a glass plate is placed on the upper surface of the lower mold 31, and the glass plate G is heated as a whole by the plurality of infrared heaters 11 (S01). Next, as shown in fig. 4 (b), the heating output of the infrared heater 11 is increased, and the region a of the glass sheet G is further heated to the vicinity of the softening point, so that the glass sheet G adheres to the curved surface of the lower mold 31 by its own weight (S02). Next, as shown in fig. 4 (C), the heating output of the infrared heater 11 e is increased to further heat the region B of the glass sheet G to the vicinity of the softening point, and then the heating outputs of the infrared heaters 11B, C, and d are increased to further heat the region C of the glass sheet G to the vicinity of the softening point, so that the region C of the glass sheet G is bonded to the curved surface of the lower mold 31 by its own weight (S03, S04). If necessary, the cavity of the lower mold 31 may be evacuated (S05). In addition, the cavity of the lower mold 31 is designed to preferably have one or more cavities.
Refer to fig. 5, 6 and 7. Fig. 5 is a flowchart showing the steps in the case where the pressing roll 21 is used in the method for forming a curved surface of glass according to example 1 of the present invention. Fig. 6 and 7 are diagrams showing the heating of the glass sheet G to the rotation and pressing of the pressing roller 21 in the curved surface forming of the glass in example 1 of the present invention, in which (a) to (c) are shown in time series, and fig. 7 (a) should be understood as a diagram showing a state following fig. 6 (c).
The process of fig. 5 will be described with reference to fig. 6 and 7. First, as shown in fig. 6 (a), a glass plate is placed on the upper surface of the lower mold 32, and the glass plate G is heated by the plurality of infrared heaters 11 (S11). Next, as shown in fig. 6 (b), the heating output of the infrared heater 11 is increased, and the region a of the glass sheet G is further heated to the vicinity of the softening point, so that the glass sheet G adheres to the curved surface of the lower mold 32 by its own weight (S12). Subsequently, as shown in fig. 6 (c), the heating output of the infrared heater 11 e is increased, and the region B of the glass sheet G is further heated to the vicinity of the softening point (S13).
After selectively heating the areas a and B of the glass sheet G to adhere the curved surface of the lower mold 32 by its own weight, the infrared heater 11 is moved upward as shown in fig. 7 (a) (S14). When the infrared heater 11 moves upward, as shown in fig. 7 (b), the pressing roller 21 enters between the infrared heater 11 and the glass plate G, and waits at a predetermined position on the upper surface of the glass plate G (S15). Then, as shown in fig. 7 (c), the pressing roller 21 presses the glass sheet G while rotating along the undulation of the lower mold 32 (S16). If necessary, the cavity of the lower mold 32 may be evacuated (S17). In addition, the cavity of the lower mold 32 is preferably provided with one or more cavities.
While the preferred embodiments of the glass curve forming apparatus and method of the present invention have been described above, it should be understood that various modifications may be made without departing from the technical scope of the present invention.
Industrial applicability
The method and the device for forming the curved surface of the glass can make the position of the glass plate to be bent drop to the curved surface of the lower die due to the self weight by independently controlling the infrared heaters which are a plurality of heating elements arranged. In addition, in the case of using the roller, by applying the heat-resistant cloth to the outer circumferential surface of the roller, not only is no thermal shock generated, but also damage to the glass is facilitated to be prevented. As a result, the glass sheet realizes a curved surface and an optical mirror surface having high-quality surface properties, and therefore the formed glass can be widely used for in-vehicle display devices and the like.
Description of the reference numerals
100. Glass curved surface forming device
1. Heating part
11. Infrared heater
12. Heater supporting arm
2. Forming section
20. Roller device
21. Press roller
210. Peripheral surface of the roller
211. Heat-resistant cloth
22. Roll shaft
23. Track body
31. 32 lower die
G glass plate.
Claims (8)
1. A glass curve forming apparatus is provided with: a lower mold on which a glass plate is placed and which has one or more mold cavities capable of evacuating the glass plate; a plurality of infrared heaters, characterized in that,
the plurality of infrared heaters are arranged in parallel in the longitudinal direction with respect to the upper surface of the lower mold, and the plurality of infrared heaters arranged in parallel are individually controlled to cause a desired position of the glass sheet to sag due to its own weight, thereby forming the glass sheet with a predetermined curvature.
2. A glass curve forming apparatus is provided with: a lower mold on which a glass plate is placed and which has one or more mold cavities capable of evacuating the glass plate; one or more press rolls for pressing the glass sheet in a desired bending direction; a plurality of infrared heaters, characterized in that,
the outer peripheral surface of the pressing roller is coated by heat-resistant cloth,
the plurality of infrared heaters are arranged side by side in the longitudinal direction with respect to the upper surface of the lower mold, and any one of the plurality of infrared heaters arranged side by side that can heat a desired portion of the glass plate placed on the lower mold is selectively heated, whereby the glass plate is formed with a predetermined curvature.
3. The glass curve forming apparatus according to claim 2,
the heat-resistant cloth is a fabric of fibers selected from glass fibers, silica fibers, alumina fibers, ceramic fibers and aramid fibers.
4. The glass curve forming apparatus according to claim 2 or 3,
in a state where a desired portion of the glass sheet is heated to a bending temperature by the infrared heater, one or more of the press rolls are rotated along the desired curved surface of the lower mold, and a pressing force is applied.
5. The glass curve forming apparatus according to claim 4,
evacuating the mold cavity in the lower mold, where one or more of the press rolls has just rotated, to form the glass sheet with a prescribed curvature.
6. A method for forming a curved surface of glass is characterized in that,
in a glass curved surface forming device which is provided with a lower die for placing a glass plate and one or a plurality of die cavities capable of vacuumizing the glass plate and a plurality of infrared heaters,
the plurality of infrared heaters are arranged side by side in the longitudinal direction with respect to the upper surface of the lower mold, and the plurality of infrared heaters arranged side by side are individually controlled to cause a desired position of the heated glass sheet to hang down along the curved surface of the lower mold due to its own weight, thereby forming the glass sheet with a predetermined curvature.
7. A method for forming a curved surface of glass is characterized in that,
the glass curve forming device comprises a lower die for placing a glass plate and having one or more vacuum cavities, one or more pressing rollers for pressing the glass plate arranged above the lower die in a desired bending direction, and a plurality of infrared heaters, and comprises the following steps:
a step of placing the glass sheet on the lower mold;
selectively heating a desired portion of the glass plate to a softening point at which the glass plate is bent by its own weight by an arbitrary infrared heater;
a step of moving the infrared heater upward and then interposing the infrared heater and the glass plate between them by the pressing roller;
and a step of rotating the glass sheet at a desired portion of the glass sheet along the curved surface of the lower mold by one or more pressing rollers to apply a pressing force to the desired portion.
8. A method for forming a curved glass surface is characterized in that,
the glass curve forming device comprises a lower die for placing a glass plate and having one or more vacuum cavities, one or more pressing rollers for pressing the glass plate arranged above the lower die in a desired bending direction, and a plurality of infrared heaters, and comprises the following steps:
placing the glass sheet on the lower mold;
selectively heating a desired portion of the glass plate to a softening point at which the glass plate is bent by its own weight by an arbitrary infrared heater;
a step of moving the infrared heater upward and then interposing the infrared heater and the glass plate between them by the pressing roller;
rotating a desired portion of the glass sheet along the curved surface of the lower mold by one or more pressing rollers to apply a pressing force to the desired portion;
and a molding step of forming the mold cavity with a predetermined curvature by evacuating the mold cavity immediately after the rotation of the one or more pressing rollers in the lower mold.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021068789A JP2022163758A (en) | 2021-04-15 | 2021-04-15 | Apparatus and method for molding glass into curved surface shape |
| JP2021-068789 | 2021-04-15 |
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| Publication Number | Publication Date |
|---|---|
| CN115215535A true CN115215535A (en) | 2022-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111325662.2A Pending CN115215535A (en) | 2021-04-15 | 2021-11-10 | Apparatus and method for forming glass into curved shape |
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| CN208218694U (en) * | 2018-04-18 | 2018-12-11 | 河北派格玻璃有限公司 | A kind of novel composite fireproof glass silica gel heat pressure roller device |
| TW201943664A (en) * | 2018-04-18 | 2019-11-16 | 日商武內製作所股份有限公司 | Device and method for forming glass into curved surface shape |
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2021
- 2021-04-15 JP JP2021068789A patent/JP2022163758A/en active Pending
- 2021-11-10 CN CN202111325662.2A patent/CN115215535A/en active Pending
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|---|---|---|---|---|
| US5470367A (en) * | 1990-11-19 | 1995-11-28 | Tamglass Oy | Heating apparatus for a glass-sheet bending station |
| CN1384074A (en) * | 2001-05-09 | 2002-12-11 | 旭硝子株式会社 | Plate article locator and glass plate blending molder |
| CN102757169A (en) * | 2012-07-20 | 2012-10-31 | 福耀玻璃工业集团股份有限公司 | Bending furnace and method for bending glass plate |
| CN105555719A (en) * | 2013-07-16 | 2016-05-04 | 康宁股份有限公司 | Apparatus and method for bending thin glass |
| CN208218694U (en) * | 2018-04-18 | 2018-12-11 | 河北派格玻璃有限公司 | A kind of novel composite fireproof glass silica gel heat pressure roller device |
| TW201943664A (en) * | 2018-04-18 | 2019-11-16 | 日商武內製作所股份有限公司 | Device and method for forming glass into curved surface shape |
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| JP2022163758A (en) | 2022-10-27 |
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