CN114751633B - Hot bending forming device and forming method for large-size ultrathin glass member - Google Patents
Hot bending forming device and forming method for large-size ultrathin glass member Download PDFInfo
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- CN114751633B CN114751633B CN202210487604.8A CN202210487604A CN114751633B CN 114751633 B CN114751633 B CN 114751633B CN 202210487604 A CN202210487604 A CN 202210487604A CN 114751633 B CN114751633 B CN 114751633B
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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
- C03B23/0066—Re-forming shaped glass by bending
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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
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- 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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Abstract
The invention relates to the technical field of glass hot bending processing, in particular to a large-size ultrathin glass member hot bending forming device and a forming method thereof, wherein the forming device comprises a regulating and controlling unit, a furnace chamber, a die body, a supporting component, a load unit, a driving unit, a first heating component and a second heating component, wherein the temperature of the first heating component is controlled to realize rough adjustment, and the laser regulation and control of the second heating component are combined to quickly realize heating fine adjustment, so that energy is concentrated to a region needing forming efficiently and accurately, and the macroscopic performance and controllability of ultrathin glass forming are quickly improved; according to the forming method, after the glass blank is subjected to preliminary heating and reaches the temperature near the softening point, the upper quartz mold and the lower quartz mold are closed, the mold body is adopted to realize the accessibility of a laser light path of a closed environment, the temperature of an ultrathin glass component can be directly focused for heating according to the high-controllability, non-contact and high-efficiency accurate thermal state accumulation effect, the macroscopic performance and the controllability of the ultrathin glass forming are improved, and the forming effect is good.
Description
Technical Field
The invention relates to the technical field of glass hot bending processing, in particular to a hot bending forming device and a forming method of a large-size ultrathin glass member.
Background
The manufacture of high-performance display screens is one of the bottlenecks restricting the development of the electronic information industry in China. The large-size curved ultrathin glass member has good market prospect in the field of vehicle-mounted display screens. However, as the vehicle-mounted display devices are developed toward weight reduction, screen enlargement, curved surface formation and high definition, the problem of "neck" is becoming more prominent in the entire high-end display industry. The high-performance display glass member has the characteristics of ultra-thinning, precision, high quality and the like, the appearance precision of the special-shaped surface is required to be high, the surface is free from defects, and the high consistency (high light transmittance and refractive index) is required to meet the high-performance display requirement, and the manufacturing difficulty of the large-size complex curved surface ultra-thin glass member is also remarkably improved.
For example, the patent application with publication number of CN109205999a discloses a high-efficiency processing method of 3D curved cover glass, and the processing technology of curved glass mainly has the following problems: (1) Only a U-shaped heating pipe is used as a source to directly heat the mould and the glass blank, so that the problems of weak controllability, large temperature gradient in the blank and the like exist; (2) The die closing time is too early, the ultrathin glass blank is not softened in time, and ultrathin glass breakage caused by the weight of the die is extremely easy to occur. In addition, the traditional process is adopted for carrying out hot press molding of the ultrathin glass, and surface defects such as crystallization, holes, cracks and the like are easy to occur, mainly because the ultrathin glass has great differences from common glass in aspects of size span (length-thickness ratio is more than 2000:1), shape complexity (space special-shaped curved surface), temperature sensitivity (0.5 ℃) and stress tolerance (0.5 Pa), and the traditional hot press process can only rapidly and integrally and unevenly heat, can not realize uniform heating and pressurization with local high resolution, and causes phenomena such as large temperature gradient, nonuniform stress distribution, severe glassy state rheological and the like in the hot press molding surface quality to be directly influenced. Larger shape and position errors (such as flatness, curvature radius and the like) can also occur, because the traditional hot-pressing temperature-pressure-position regulation strategy has slow response, low precision and weak robustness, and is difficult to accurately regulate and control complex multiple parameters such as temperature, pressure, displacement and the like in the hot-pressing process of the ultrathin glass with obvious size effect, thereby easily causing the rebound of the curved ultrathin glass and failing to ensure the shape and position precision of hot-pressing molding. Therefore, the traditional hot press molding process and regulation and control mode for common glass are not suitable for ultrathin glass, and cannot meet the manufacturing requirements of high-performance large-size special-shaped curved ultrathin glass on low defects and high shape and position precision.
In view of the foregoing, there is a need for a new hot bending apparatus and method for forming large-sized ultrathin glass members to better solve the above-mentioned problems.
Disclosure of Invention
In order to solve the problems, the invention provides a hot bending forming device and a forming method for a large-size ultrathin glass member, which can better perform hot bending forming processing on the large-size ultrathin glass member, and have high forming precision and high passing rate so as to meet the quality requirements of the forming process of the large-size ultrathin glass member.
The technical scheme adopted by the invention is as follows:
the hot bending forming device for the large-size ultrathin glass member comprises a regulating and controlling unit, a furnace chamber, a die body, a supporting component, a load unit, a driving unit, a first heating component and a second heating component, wherein the supporting component, the load unit, the driving unit, the first heating component and the second heating component are respectively connected with the regulating and controlling unit;
the die body comprises a quartz upper die and a quartz lower die which are connected in a die clamping manner, wherein the quartz upper die and the quartz lower die are respectively arranged in the furnace chamber, and a forming cavity is formed by surrounding the quartz upper die and the quartz lower die when the quartz upper die and the quartz lower die are connected in a die clamping manner;
the support component is arranged on the quartz lower die and is connected with the quartz upper die;
the driving unit is connected with the load unit, and the load unit is connected with the quartz lower die;
the first heating component is arranged above the quartz upper die and is heated by a laser light source;
the second heating component is arranged in the quartz lower die.
In some embodiments, the light transmittance of the mold body is greater than 94%.
In some embodiments, the support assembly is provided with a plurality of support rods capable of automatically lifting, and the quartz upper die is provided with a plurality of grooves matched with the support rods.
In some embodiments, the first heating component is provided with a laser and a reflector, and a light source emitted by the laser is emitted into the die body after the light path is regulated by the reflector.
In some embodiments, the first heating component is further provided with a doubling mirror, and the reflector adjusts the light source after the light path, and the light source is injected into the die body after energy is enhanced by the doubling mirror.
In some embodiments, the laser is an ultrashort pulse laser, and the light source of the ultrashort pulse laser adopts 1035nm infrared pulse laser.
In some embodiments, the second heating assembly is provided as a heating tube.
Based on the same inventive concept, the application also provides a hot bending forming method of a large-size ultrathin glass member, which comprises the following steps:
s1, determining shape characteristics, and modeling heating path characteristics according to the size characteristics of the ultrathin glass blank to be subjected to hot bending;
s2, filling a mold and a sample, putting an ultrathin glass blank into the molding cavity and locating the ultrathin glass blank on the quartz lower mold, and separating the quartz upper mold from the quartz lower mold at intervals through a supporting component;
s3, preheating, namely heating the die body and the ultrathin glass blank through a second heating assembly, so that the ultrathin glass blank is heated to be 2/3 of the temperature close to the softening point of glass;
s4, precisely regulating and controlling laser, namely closing the quartz upper die and the quartz lower die to form a closed processing environment, and precisely heating through a second heating component according to a preset heating path to realize controllable ultrathin glass forming;
s5, performing primary selection and trial processing on processing parameters, performing ultra-thin glass blank preprocessing, and adjusting the process parameters;
s6, batch processing production.
In some embodiments, in step S4, the first heating component is used to perform laser light source space-time shaping, so as to perform precise heating, so as to achieve ultra-thin glass forming controllability.
In some embodiments, the process parameters in step S5 include laser parameters, initial heating temperature, die pressure, and hold time.
The beneficial effects of the invention are as follows:
1. the forming device comprises a regulating and controlling unit, a furnace chamber, a die body, a supporting component, a load unit, a driving unit, a first heating component and a second heating component, wherein the supporting component, the load unit, the driving unit, the first heating component and the second heating component are respectively connected with the regulating and controlling unit;
2. according to the forming method, the quartz upper die and the quartz lower die are separated through the supporting component, the glass blank is subjected to preliminary heating, when the glass blank reaches the temperature near the softening point, the upper die and the lower die are closed, a die body is adopted to realize that a closed environment laser light path is reachable, an ultrathin glass component can be directly focused for heating according to the high-controllability, non-contact and high-efficiency accurate thermal state accumulation effect of the die body, the integral non-uniform heating is realized, the uniform heating and the pressurization of local precise high-resolution are realized, the glass molecular arrangement structure and the physical parameters thereof are regulated in a laser space-time shaping mode, the macroscopic performance and the controllability of the ultrathin glass forming are improved, the heating efficiency and the temperature control precision of the thermal bending forming of the ultrathin glass component are greatly improved, and the surface defects such as crystallization, holes and cracks and the like caused by the temperature gradient generated by the nonuniform heat transfer of the die are improved; in addition, the laser composite hot bending molding reduces the high-temperature heating of the original closed cavity, reduces the energy consumption and saves the production cost.
Drawings
FIG. 1 is a schematic illustration of an exploded view of a mold body, support assembly and glass blank in some embodiments of the invention;
FIG. 2 is a schematic diagram of a quartz upper die according to some embodiments of the invention;
FIG. 3 is a schematic view of a connection structure of a quartz lower mold and a support assembly according to some embodiments of the present invention;
FIG. 4 is a schematic view of a molding apparatus according to some embodiments of the present invention;
FIG. 5 is a schematic block diagram of a molding method in some embodiments of the invention;
reference numerals illustrate: 1. furnace chamber, 2, mold body, 21, quartz upper mold, 211, groove, 22, quartz lower mold, 23, forming cavity, 3, support assembly, 4, load unit, 5, drive unit, 6, first heating assembly, 61, laser, 611, laser path, 62, reflector, 63, magnifier, 7, second heating assembly, 8, glass blank.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Example 1
As shown in fig. 1 to 4, the hot bending forming device for a large-size ultrathin glass member according to the embodiment comprises a regulating unit (not shown in the drawings), a furnace chamber 1, a mold body 2, a supporting component 3, a load unit 4, a driving unit 5, a first heating component 6 and a second heating component 7, wherein the supporting component 3, the load unit 4, the driving unit 5, the first heating component 6 and the second heating component 7 are respectively connected with the regulating unit;
the die body 2 comprises a quartz upper die 21 and a quartz lower die 22 which are connected in a die-locking manner, wherein the quartz upper die 21 and the quartz lower die 22 are respectively arranged in the furnace chamber 1, and a forming cavity 23 is formed by surrounding the quartz upper die 21 and the quartz lower die 22 when the quartz upper die 21 and the quartz lower die 22 are connected in a die-locking manner;
the supporting component 3 is arranged on the quartz lower die 22 and is connected with the quartz upper die 21;
the driving unit 5 is connected with the load unit 4, and the load unit is connected with the quartz lower die 22;
the first heating component 5 is arranged above the quartz upper die 21, and the first heating component 5 is heated by a laser light source;
the second heating element 5 is arranged in the quartz lower die 22.
The forming device that this embodiment provided, during processing, can support the separation through supporting component 3 with upper and lower mould, avoid when the shaping temperature of glass embryo material 8 has not reached near the softening point, it is broken to lead to ultra-thin glass because of mould weight, and realize temperature "coarse tuning" through the temperature control of second heating component 7, it carries out laser regulation and control to combine first heating component 6, realize "fine tuning" heating fast, thereby through the mode of laser non-contact, high efficiency, accurate gathering the energy to the region that needs fashioned, and can also regulate and control glass molecule arrangement structure and physical property parameter through space-time plastic mode, promote ultra-thin glass shaping macroscopic property and controllability fast, effectively ensure shaping effect.
Example 2
In this embodiment, specifically, the upper quartz mold 21 and the lower quartz mold 22 are transparent molds with a light transmittance greater than 94%, so that the laser light source passes through the transparent molds to perform accurate temperature regulation, and the structure is simple, and the temperature controllability is good.
Example 3
In this embodiment, the support assembly 3 is provided with a plurality of support rods capable of automatically lifting, the quartz upper die 21 is matched with the support rods and is provided with a plurality of grooves 211, specifically, the support rods can be set to be automatically telescopic, driving pieces and support rods in a one-to-one correspondence manner, lifting driving is performed, and during processing, the support rods can extend into the grooves 211 and lift through the support rods, so that separation or connection between the quartz upper die 21 and the quartz upper die 22 is realized.
Example 4
In this embodiment, the first heating element 6 is provided with a laser 61 and a reflector 62, and the light source emitted by the laser 61 is emitted into the mold body 1 after the light path is adjusted by the reflector 62, and the incident light path of the laser light source can be adjusted by the cooperation of the laser 61 and the reflector 62, so that precise heating control is performed.
The second heating component 7 is set as the heating pipe, through setting up the heating pipe at quartz lower mould 22, can carry out initial heating to quartz lower mould 22, quartz upper mould 21, glass blank 8 and shaping ambient temperature, realizes the temperature coarse adjustment, and preliminary makes whole closed environment temperature comparatively balanced, heats through the heating pipe, and its simple structure, control is convenient, and heating stability is good.
Example 5
On the basis of the above embodiment, in this embodiment, the first heating element 6 is further provided with a doubling mirror 63, and the reflector 62 adjusts the light source after the light path, after the energy is enhanced by the doubling mirror 63, the light source is injected into the mold body 1, and by adding the doubling mirror 63, the laser energy can be effectively enhanced, so as to ensure the heating effect.
Specifically, the laser 61 is an ultrashort pulse laser, and a light source of the ultrashort pulse laser adopts 1035nm infrared pulse laser.
Example 6
In this embodiment, the surface cavity of the upper quartz mold 21 is consistent with the upper surface size of the large-size ultrathin glass member, the surface cavity of the lower quartz mold 22 is consistent with the lower surface size of the large-size ultrathin glass member, and the upper quartz mold 21 and the lower quartz mold 22 are transparent molds with softening point temperature of 1780 ℃, compressive strength of 690Mpa and light transmittance of more than 94%.
Specifically, referring to fig. 1-3, the support assembly 3 is provided with six support rods, and six grooves 211 are correspondingly formed in the quartz upper die 21, wherein the six support rods are symmetrically arranged in pairs with respect to the cross section of the quartz upper die 21 in the length direction; the supporting rods are respectively controlled by six driving motors in a coordinated manner to realize vertical lifting, so that ultrathin glass breakage caused by the weight of a die is avoided, an ultrashort pulse laser is arranged above the quartz upper die 21, the laser 61 is an ultrashort pulse laser and is horizontally arranged, a light source is 1035nm infrared pulse laser, the ultrashort pulse laser emits laser in the horizontal direction, a laser light path 611 vertically and downwards irradiates the closed forming cavity 23 after being reflected by a reflector 62, the laser light path 611 reaches maximum energy after passing through a doubling mirror 63, the laser light path 611 directly irradiates the ultrathin glass blank 8 through the quartz upper die 21, heats a specific region of the ultrathin glass blank, and drives a load unit 4 through a driving unit 5 after the heating temperature reaches the hot bending temperature, and the quartz lower die 22 is driven to move upwards to complete die assembly with the quartz upper die 21.
In the embodiment, after the glass blank 8 is primarily heated, a mold body 2 is adopted to realize a closed environment laser light path 611, the temperature of an ultrathin glass member can be directly focused to rise by means of a non-contact high-efficiency accurate thermal state accumulation effect with high laser controllability, so that the whole glass member is heated unevenly, the glass member is heated and pressurized locally and accurately with high resolution evenly, the glass molecule arrangement structure and physical parameters thereof are regulated and controlled in a laser space-time shaping mode, the macroscopic performance and controllability of the ultrathin glass member are improved, the heating efficiency and the temperature control precision of the thermal bending forming of the ultrathin glass member are greatly improved, and the surface defects such as crystallization, holes and cracks and the like caused by temperature gradients generated by uneven heat transfer of the mold are improved; in addition, the laser composite hot bending molding reduces the high-temperature heating of the original closed cavity, reduces the energy consumption and saves the production cost.
The method for hot bending and forming the large-size ultrathin glass comprises the following steps:
s1, determining shape characteristics, and modeling heating path characteristics, namely modeling scanning path characteristics of a laser light source, according to the size characteristics of an ultrathin glass blank 8 to be subjected to hot bending;
s2, filling a mold and a sample, placing an ultrathin glass blank 8 into the forming cavity 23 and locating the ultrathin glass blank in the quartz lower mold 22, and separating the quartz upper mold 21 from the quartz lower mold 22 at intervals through a supporting component 3;
s3, preheating, namely heating the die body 2 and the ultrathin glass blank 8 through a second heating assembly 7, so that the ultrathin glass blank 8 is heated to 2/3 of the temperature close to the softening point of glass;
s4, precisely regulating and controlling laser, namely closing the quartz upper die 21 and the quartz lower die 22 to form a closed processing environment, and precisely heating by a laser light source space-time shaping mode through the first heating component 6 according to a preset heating path so as to realize the molding controllability of the ultrathin glass;
s6, performing primary selection and trial processing on processing parameters, performing pre-processing on the ultrathin glass blank 8, and adjusting and optimizing the processing parameters, wherein the processing parameters comprise laser parameters, primary heating temperature, die pressure and holding time;
s6, batch processing production.
Specifically, the die pressure is controlled by driving the load unit 4 by the driving unit 5 to apply pressure to the quartz lower die 22.
The molding method has the advantages that the steps are simple, the processing is simple and convenient, in the molding process, the mold body 2 is adopted to realize the accessibility of a laser light path of a closed environment, the rough adjustment is realized through heating pipe temperature control, the fine adjustment is realized through combining laser adjustment and control, the overall nonuniform heating is realized through laser thermoforming adjustment and control, the local precise high-resolution uniform heating and pressurization are realized, namely, the energy is concentrated to a region needing to be molded in a high-efficiency and precise manner through a laser non-contact manner, in addition, the glass molecular arrangement structure and the physical parameters thereof can be regulated and controlled in a space-time shaping manner, the molding macroscopic performance and the controllability of the ultra-thin glass are improved, the molding precision of the large-size ultra-thin glass hot bending molding processing member is high, and the molding stability is good.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. The hot bending forming device for the large-size ultrathin glass member is characterized by comprising a regulating and controlling unit, a furnace chamber, a die body, a supporting component, a load unit, a driving unit, a first heating component and a second heating component, wherein the supporting component, the load unit, the driving unit, the first heating component and the second heating component are respectively connected with the regulating and controlling unit;
the die body comprises a quartz upper die and a quartz lower die which are connected in a die clamping manner, wherein the quartz upper die and the quartz lower die are respectively arranged in the furnace chamber, and a forming cavity is formed by surrounding the quartz upper die and the quartz lower die when the quartz upper die and the quartz lower die are connected in a die clamping manner;
the support component is arranged on the quartz lower die and is connected with the quartz upper die;
the driving unit is connected with the load unit, and the load unit is connected with the quartz lower die;
the first heating component is arranged above the quartz upper die and is heated by a laser light source;
the second heating component is arranged in the quartz lower die;
wherein the light transmittance of the quartz upper die and the quartz lower die is more than 94%;
the first heating component is provided with a laser and a reflector, and a light source emitted by the laser is emitted into the die body after the light path is regulated by the reflector;
the first heating component is further provided with a doubling mirror, and the reflector adjusts a light source behind the light path, and the light source is injected into the die body after energy is enhanced by the doubling mirror.
2. The hot bending forming device for large-size ultrathin glass members according to claim 1, wherein the supporting component is provided with a plurality of supporting rods capable of automatically lifting, and the quartz upper die is provided with a plurality of grooves matched with the supporting rods.
3. The apparatus for hot bending a large-sized ultra-thin glass member according to claim 1, wherein the laser is an ultra-short pulse laser.
4. The apparatus for hot bending a large-sized ultra-thin glass member according to claim 1, wherein the light source of the laser is a 1035nm infrared pulse laser.
5. A method for hot bending a large-size ultra-thin glass member using the molding apparatus according to any one of claims 1 to 4, comprising the steps of:
s1, determining shape characteristics, and modeling heating path characteristics according to the size characteristics of the ultrathin glass blank to be subjected to hot bending;
s2, filling a mold and a sample, putting an ultrathin glass blank into the forming cavity, and separating the quartz upper mold from the quartz lower mold at intervals through a supporting component;
s3, preheating, namely heating by a second heating component to enable the ultrathin glass blank to be heated to be 2/3 of the temperature close to the softening point of the glass;
s4, precisely regulating and controlling laser, namely closing the quartz upper die and the quartz lower die to form a closed processing environment, precisely heating through a first heating component according to a preset heating path, and realizing controllable ultrathin glass forming;
s5, performing primary selection and trial processing on processing parameters, performing ultra-thin glass blank preprocessing, and adjusting the process parameters;
s6, batch processing production.
6. The method for hot bending a large-size ultrathin glass member according to claim 5, wherein in the step S4, the first heating component is used for performing a laser light source space-time shaping mode, and precise heating is performed to realize the controllability of ultrathin glass forming.
7. The method for hot bending a large-sized ultra-thin glass member according to claim 5, wherein the process parameters in step S5 include laser parameters, initial heating temperature, mold pressure and holding time.
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| CN202210487604.8A CN114751633B (en) | 2022-05-06 | 2022-05-06 | Hot bending forming device and forming method for large-size ultrathin glass member |
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| DE102010033816A1 (en) * | 2010-06-16 | 2011-12-22 | Giw Gesellschaft Für Innovative Werkzeugsysteme Mbh | Tempered tool |
| CN107089790A (en) * | 2017-06-22 | 2017-08-25 | 深圳市和西智能装备股份有限公司 | A kind of glass bending multisection type hot briquetting prepressing device |
| CN109970326B (en) * | 2019-03-22 | 2023-11-28 | 广东华中科技大学工业技术研究院 | Intelligent temperature control die for 3C component hot bending and control method thereof |
| CN110687941B (en) * | 2019-08-15 | 2021-07-30 | 广东华中科技大学工业技术研究院 | System and method for synchronously controlling temperatures of upper die and lower die of 3D cover plate glass |
| CN111003927B (en) * | 2019-12-27 | 2022-02-18 | 广东华中科技大学工业技术研究院 | Targeted microwave two-stage temperature control hot bending glass device and control method thereof |
| CN111268895B (en) * | 2020-02-13 | 2022-06-28 | 广东华中科技大学工业技术研究院 | Glass hot bending device and method based on laser shaping and orientation assistance |
| CN114212979B (en) * | 2021-12-30 | 2023-08-15 | 广东华中科技大学工业技术研究院 | Glass hot bending die and glass hot bending method |
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