CN110963682A - Production mold and forming process of curved glass - Google Patents
Production mold and forming process of curved glass Download PDFInfo
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- CN110963682A CN110963682A CN201811156932.XA CN201811156932A CN110963682A CN 110963682 A CN110963682 A CN 110963682A CN 201811156932 A CN201811156932 A CN 201811156932A CN 110963682 A CN110963682 A CN 110963682A
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- mold
- cover plate
- curved glass
- insert
- core
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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
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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
- C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
The invention relates to a production mold of curved glass and a curved glass forming process. A production mold for curved glass comprises a mold base, a mold core arranged on the mold base, and an upper mold cover plate; the upper die cover plate is provided with a plurality of inserts; and the inner side of the insert is provided with a cambered surface matched with the mold core for supplementing the curvature of the curved glass. The invention greatly saves the polishing time of the curved glass and saves the cost for customers; the yield after hot bending forming is greatly improved, the product design requirements are better met, and the profile degree can be more fit with the design requirements; the production efficiency of the hot bending equipment can be improved; the structure of the graphite mold can be designed in a diversified way, and the requirement of complex curved surface hot bending glass can be met.
Description
Technical Field
The invention relates to glass production equipment, in particular to a production mold of curved glass and a curved glass forming process.
Background
With the coming of 5G communication signals, the flexible OLED screen is about to be popularized in a large range, and the original mobile phone screen spans from 2.5D glass to 3D glass, is gradually mature and is gradually favored by customers. For this reason, mobile phone glass manufacturers actively lay out 3D glass processing in order to earn profits. In recent years, 3D glass hot bending has become a major difficulty in 3D curved glass processing, among which the most important is graphite mold, which is good and bad, and directly affects the glass forming result. Therefore, the research and development of the hot-bending graphite mold require a lot of experiments and verifications.
With the continuous growth of the intelligent terminal product market and the change of the requirements of the electronic consumer market on product appearance aesthetics and touch feeling, the 3D curved glass has a very wide market growth space. In the field of manufacturing of 3D curved glass molds, the production technology of carbon 3D curved glass molds has been very stable in mass production, and has begun to supply a large amount of products to various manufacturers such as millet, huashi, apple, HTC, samsung, and the like. At present, most of the technologies of graphite molds made in the industry come from korea, the structures of the graphite molds are relatively single, the sizes of the graphite molds are basically similar, and the graphite molds are difficult to break through. However, at present, the curved screen is not limited to this (mobile phone screen), and a series of novel glasses such as a smart bracelet, a smart watch, a curved vehicle-mounted screen, and a smart home are used. Then, for a screen with a similar complex curved surface, more reasonable hot bending equipment and a hot bending die are needed to complete the manufacture of the curved surface screen.
With the development of 3C electronic products, curved glass is more and more widely applied. However, the curved glass produced by the existing curved glass forming die and the process does not meet the technical requirements. For example, in the mold for hot bending of 3D curved glass at the present stage, the manufactured glass has many poor problems of concave and convex points, stamping, indentation and the like; after the glass is manufactured and molded, the profile degree does not meet the design requirement, so that the rear section is difficult to attach; curved glass with high curvature and complex curvature cannot be finished; the structure of the die is single, the range of the machinable product is limited, and the large-size curved screen cannot be subjected to hot bending forming; the size of the die is fixed, the die is difficult to change and repair, and the die repair is troublesome.
Fig. 1 shows a structural diagram of a conventional curved glass hot bending mold, which comprises a male mold a and a female mold B, and a 3D glass product C to be bent is arranged in the middle. However, this structure is relatively simple and is convenient and practical for four-curved surface bending, but once a product with multiple curved surfaces or a product with a large size is involved, the structure cannot be satisfied.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a production mold of curved glass and a curved glass forming process.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production mold for curved glass comprises a mold base, a mold core arranged on the mold base, and an upper mold cover plate; the upper die cover plate is provided with a plurality of inserts; and the inner side of the insert is provided with a cambered surface matched with the mold core for supplementing the curvature of the curved glass.
The further technical scheme is as follows: the surface of the mold core is uniformly provided with a plurality of vacuum holes, and the vacuum holes are communicated with a vacuum generating device.
The further technical scheme is as follows: the insert is matched with the upper die cover plate; the insert is provided with a connecting structure fixedly connected with the mold base.
The further technical scheme is as follows: the mold base is provided with a buckle bulge, and the insert is provided with a buckle groove mutually connected with the buckle bulge;
or the mould base is provided with a splicing hole, and the insert is provided with a splicing column matched with the splicing hole.
The further technical scheme is as follows: the mould base is provided with a concave cavity for fixing the mould core.
The further technical scheme is as follows: the inner wall of the cavity is provided with a clamping protrusion, and the outer side of the mold core is provided with a clamping groove matched with the clamping protrusion.
The further technical scheme is as follows: the mold core is provided with an arc-shaped surface for glass molding.
The further technical scheme is as follows: the mold base, the mold core, the upper mold cover plate and the mold insert are all made of graphite.
A forming process of curved glass comprises the following steps:
placing a glass sheet to be molded in a mold cavity between a mold core and an upper mold cover plate, and buckling a mold insert to finish the material placing process;
after discharging is completed, placing the die in a hot bending machine, and performing a preheating process in an air-insulated radiation mode; meanwhile, the mold core is communicated with a vacuum generating device so that the mold core can carry out negative pressure adsorption on the glass sheet;
transferring the loaded upper die cover plate to a profiling process, heating the die, and keeping the temperature in the die cavity at 720-780 ℃ for 150-250 seconds; at the moment, the upper die cover plate is slowly pressurized to 0.3-0.5 MPa and kept for 40-60 seconds;
after high-temperature forming, the mould is conveyed to an annealing process, the upper mould cover plate is continuously maintained in pressure, and the mould core is continuously communicated with the vacuum generating device to perform negative pressure adsorption so that the glass sheet is kept in shape in the mould cavity and the internal stress of the glass sheet is eliminated;
transferring the mold to a slow cooling process, cooling the upper mold cover plate by using a cooling plate, and continuously connecting the mold core with a vacuum generating device to adsorb the formed glass sheet so as to prevent deformation;
and sixthly, transferring the mold to a cooling process, and sticking the upper mold cover plate and the mold core by using a cold water plate for cooling until the mold and the formed glass sheet are cooled to the normal temperature.
Compared with the prior art, the invention has the beneficial effects that: the invention greatly saves the polishing time of the curved glass and saves the cost for customers; the yield after hot bending forming is greatly improved, the product design requirements are better met, and the profile degree can be more fit with the design requirements; the production efficiency of the hot bending equipment can be improved; the structure of the graphite mould can be designed in a diversified way, and the requirement of complex curved surface hot bending glass can be met; according to the curved-surface glass hot-bending graphite mold, the mold repair is relatively simple and convenient after the mold is used for a certain time, and only the mold core or the mold insert needs to be modified, so that the large-area mold repair is avoided, and the time and the cutter cost are saved; the curved glass hot bending graphite mold is matched with a new radiation heating and vacuum heat absorption process, so that glass with more accurate size can be obtained; the hot bending graphite mold for curved glass can prolong the service life of the graphite mold, and the mold is not subjected to positive pressure or overpressure pressing and cannot be damaged.
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a view showing a structure of a conventional mold;
FIG. 2 is a front exploded view and a partial enlarged view of a glass sheet of a mold for producing curved glass according to the present invention;
FIG. 3 is an exploded view of a molded glass sheet of a curved glass production mold of the present invention;
fig. 4 is a matched mold perspective view of the mold for producing curved glass according to the present invention.
Detailed Description
In order to more fully understand the technical content of the present invention, the technical solution of the present invention will be further described and illustrated with reference to the following specific embodiments, but not limited thereto.
Fig. 2 to 4 are drawings of an embodiment of the present invention.
A mold for producing curved glass, as shown in fig. 2 to 4, comprises a mold base 10, a mold core 11 disposed on the mold base 10, and an upper mold cover plate 12. The upper die cover plate 12 is provided with a plurality of inserts 13. The inner side of the insert 13 is provided with a cambered surface matched with the mold core 11 for supplementing the curvature of the curved glass, and the cambered surface is arranged at the corner of the upper mold cover plate 12. The insert 13 is disposed at a place where the requirement for the camber of the curved glass is high, such as a portion with a large camber and a large camber. The insert 13 and the upper die cover plate 12 are designed in a split mode, but when the insert is used, the insert and the upper die cover plate are spliced together, and various curved glass with different curvatures is molded, so that the design can meet the molding requirement of the curved glass, and the mold is convenient to process.
The surface of the mold core 11 is uniformly provided with a plurality of vacuum holes 111, and the vacuum holes 111 are communicated with a vacuum generating device. In the process of forming the curved glass, the glass sheet is adsorbed by using vacuum negative pressure, so that the precision of the curved surface is improved.
Insert 13 mates with upper cover plate 12. The insert 13 is provided with a coupling structure fixedly coupled with the mold base 10. Insert 13 is snap fitted to mold base 10 similar to upper mold platen 12.
Specifically, the mold base 10 is provided with a snap protrusion 101, and the insert 13 is provided with a snap groove 131 mutually coupled with the snap protrusion 101. The snap protrusions 101 snap into the snap grooves 131 so that the insert 13 is coupled with the mold base 10.
In other embodiments, the mold base 10 is provided with a plug hole, and the insert 13 is provided with a plug post matching with the plug hole.
Wherein, the mold base 10 is provided with a concave cavity 102 for fixing the mold core 11, and the two are mutually buckled.
Specifically, in order to prevent the mold core 11 from shifting, a clamping protrusion 103 is arranged on the inner wall of the cavity 102, and a clamping groove 112 matched with the clamping protrusion 103 is arranged on the outer side of the mold core 11.
The mold core 11 is provided with an arc convex surface for glass molding, and the upper mold cover plate 12 is provided with an arc concave surface corresponding to the upper mold cover plate. And a die cavity is formed between the arc convex surface and the arc concave surface and used for placing the glass sheet. And under the condition of heating to the technical requirement, introducing vacuum negative pressure into the mold core 11, and pressurizing the upper mold cover plate 12 to enable the glass sheet to be subjected to hot bending forming.
The insert 13 includes a first left insert, which is disposed at a left lower corner of the upper mold cover plate 12 and is used for molding the left lower corner of the glass sheet.
Or/and the second left insert is arranged at the left upper corner of the upper die cover plate 12 and used for molding the left upper corner of the glass sheet;
or/and the first right insert is arranged at the right lower corner of the upper die cover plate 12 and used for molding the right lower corner of the glass sheet;
or/and the second right insert is arranged at the right upper corner of the upper die cover plate 12 and used for forming the right upper corner of the glass sheet.
The mold base 10, the mold core 11, the upper mold cover plate 12 and the insert 13 are all made of graphite, and in the heating process, the graphite is heat-resistant and has small deformation amount, so that the precision of the curved glass is high.
Exhaust grooves are designed on the surfaces of the mold core 11 and the upper mold cover plate 12, so that the mold is prevented from being adsorbed in a vacuum environment and influencing the operation of equipment.
A forming process of curved glass comprises the following steps:
step one, placing a glass sheet to be molded in a mold cavity between a mold core 11 and an upper mold cover plate 12, and buckling a mold insert 13 to finish the material placing process.
After discharging is completed, placing the die in a hot bending machine, and performing a preheating process in an air-insulated radiation mode; meanwhile, the mold core 11 is communicated with a vacuum generating device so that the mold core 11 can carry out negative pressure adsorption on the glass sheet.
Step three, transferring the loaded upper die cover plate to a profiling working procedure, heating the die, and keeping the temperature in the die cavity at 720-780 ℃ (preferably 750 ℃) for 150-250 seconds (preferably 200 seconds); at this time, the upper mold cover plate is slowly pressurized to 0.3 to 0.5MPa (preferably 0.4MPa) and held for 40 to 60 seconds (preferably 50 seconds).
And step four, after high-temperature forming, conveying the mold to an annealing process, continuously maintaining the pressure of the upper mold cover plate 12, and continuously communicating the mold core 11 with a vacuum generating device to perform negative pressure adsorption so as to ensure that the glass sheet is kept in shape in the mold cavity and eliminate the internal stress of the glass sheet.
And step five, transferring the mold to a slow cooling process, cooling the upper mold cover plate 12 by using a cooling plate, and continuously connecting the mold core 11 with a vacuum generating device to adsorb the formed glass sheet so as to prevent the glass sheet from deforming.
And sixthly, transferring the mold to a cooling process, and sticking the upper mold cover plate 12 and the mold core 11 by using a cold water plate for cooling until the mold and the formed glass sheet are cooled to the normal temperature.
In conclusion, the invention greatly saves the time for polishing the curved glass and saves the cost for customers; the yield after hot bending forming is greatly improved, the product design requirements are better met, and the profile degree can be more fit with the design requirements; the production efficiency of the hot bending equipment can be improved; the structure of the graphite mould can be designed in a diversified way, and the requirement of complex curved surface hot bending glass can be met; according to the curved-surface glass hot-bending graphite mold, the mold repair is relatively simple and convenient after the mold is used for a certain time, and only the mold core or the mold insert needs to be modified, so that the large-area mold repair is avoided, and the time and the cutter cost are saved; the curved glass hot bending graphite mold is matched with a new radiation heating and vacuum heat absorption process, so that glass with more accurate size can be obtained; the hot bending graphite mold for curved glass can prolong the service life of the graphite mold, and the mold is not subjected to positive pressure or overpressure pressing and cannot be damaged.
The technical contents of the present invention are further illustrated by the examples only for the convenience of the reader, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation based on the present invention is protected by the present invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The mold for producing the curved glass is characterized by comprising a mold base, a mold core arranged on the mold base and an upper mold cover plate; the upper die cover plate is provided with a plurality of inserts; and the inner side of the insert is provided with a cambered surface matched with the mold core for supplementing the curvature of the curved glass.
2. The mold for producing curved glass according to claim 1, wherein a plurality of vacuum holes are uniformly distributed on the surface of the mold core, and the vacuum holes are communicated with a vacuum generating device.
3. The mold for producing curved glass according to claim 1, wherein the insert and the upper mold cover plate are matched with each other; the insert is provided with a connecting structure fixedly connected with the mold base.
4. The mold for producing curved glass according to claim 3, wherein the mold base is provided with a snap projection, and the insert is provided with a snap groove for coupling with the snap projection;
or the mould base is provided with a splicing hole, and the insert is provided with a splicing column matched with the splicing hole.
5. The mold for producing curved glass according to claim 1, wherein the mold base is provided with a cavity for fixing the mold core.
6. The mold for producing curved glass according to claim 5, wherein the cavity has a clamping protrusion on an inner wall thereof, and the mold core has a clamping groove on an outer side thereof for engaging with the clamping protrusion.
7. The mold for producing curved glass according to claim 1, wherein the mold core is provided with an arc-shaped convex surface for glass molding, and the upper mold cover plate is provided with an arc-shaped concave surface corresponding to the arc-shaped convex surface; and a die cavity is formed between the arc convex surface and the arc concave surface.
8. The mold for producing curved glass according to claim 1, wherein the mold base, the mold core, the upper mold cover plate and the insert are made of graphite.
9. The mold for producing curved glass according to claim 1, wherein the mold core and the upper mold cover plate are provided with air vent grooves on the surfaces thereof.
10. The forming process of the curved glass is characterized by comprising the following steps of:
placing a glass sheet to be molded in a mold cavity between a mold core and an upper mold cover plate, and buckling a mold insert to finish the material placing process;
after discharging is completed, placing the die in a hot bending machine, and performing a preheating process in an air-insulated radiation mode; meanwhile, the mold core is communicated with a vacuum generating device so that the mold core can carry out negative pressure adsorption on the glass sheet;
transferring the loaded upper die cover plate to a profiling process, heating the die, and keeping the temperature in the die cavity at 720-780 ℃ for 150-250 seconds; at the moment, the upper die cover plate is slowly pressurized to 0.3-0.5 MPa and kept for 40-60 seconds;
after high-temperature forming, the mould is conveyed to an annealing process, the upper mould cover plate is continuously maintained in pressure, and the mould core is continuously communicated with the vacuum generating device to perform negative pressure adsorption so that the glass sheet is kept in shape in the mould cavity and the internal stress of the glass sheet is eliminated;
transferring the mold to a slow cooling process, cooling the upper mold cover plate by using a cooling plate, and continuously connecting the mold core with a vacuum generating device to adsorb the formed glass sheet so as to prevent deformation;
and sixthly, transferring the mold to a cooling process, and sticking the upper mold cover plate and the mold core by using a cold water plate for cooling until the mold and the formed glass sheet are cooled to the normal temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811156932.XA CN110963682B (en) | 2018-09-30 | 2018-09-30 | Curved glass production die and curved glass forming process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811156932.XA CN110963682B (en) | 2018-09-30 | 2018-09-30 | Curved glass production die and curved glass forming process |
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| CN110963682A true CN110963682A (en) | 2020-04-07 |
| CN110963682B CN110963682B (en) | 2023-08-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111662000A (en) * | 2020-07-28 | 2020-09-15 | 深圳市东方碳素实业有限公司 | Hot bending die |
| CN114772911A (en) * | 2022-04-19 | 2022-07-22 | 维达力实业（赤壁）有限公司 | Anti-glare glass, manufacturing method thereof and electronic equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111662000A (en) * | 2020-07-28 | 2020-09-15 | 深圳市东方碳素实业有限公司 | Hot bending die |
| CN111662000B (en) * | 2020-07-28 | 2024-03-26 | 深圳市东方碳素实业有限公司 | Hot bending die |
| CN114772911A (en) * | 2022-04-19 | 2022-07-22 | 维达力实业（赤壁）有限公司 | Anti-glare glass, manufacturing method thereof and electronic equipment |
| CN114772911B (en) * | 2022-04-19 | 2023-11-28 | 维达力科技股份有限公司 | Anti-glare glass, manufacturing method thereof and electronic equipment |
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| CN110963682B (en) | 2023-08-11 |
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