CN114751633B - Hot bending forming device and forming method for large-size ultrathin glass member - Google Patents

Abstract

The invention relates to the technical field of glass hot bending processing, in particular to a large-size ultra-thin glass member hot bending forming device and a forming method thereof. The forming device of the present application includes a control unit, a furnace cavity, a mold body, a supporting component, and a load unit , the drive unit, the first heating component and the second heating component, which realize “coarse adjustment” through the temperature control of the first heating component, combined with the laser control of the second heating component, quickly realize the “fine adjustment” of heating, and efficiently and accurately control the The energy is concentrated in the area that needs to be formed, and the macroscopic performance and controllability of ultra-thin glass forming are rapidly improved; the forming method provided by this application preliminarily heats the glass blank to reach a temperature near the softening point, and then makes the upper and lower quartz molds fit together. The mold body uses the mold body to realize the laser optical path in a closed environment. With its high controllability, non-contact, efficient and accurate thermal state accumulation, it can directly focus on ultra-thin glass components for heating, improving the macroscopic performance of ultra-thin glass forming and its reliability. Controllability, good molding effect.

Description

A large-size ultra-thin glass component thermal bending forming device and forming method thereof

technical field

The invention relates to the technical field of glass hot-bending processing, in particular to a large-size ultra-thin glass component hot-bending forming device and a forming method thereof.

Background technique

The manufacture of high-performance display screens is one of the bottlenecks restricting the development of my country's electronic information industry. Large-size curved ultra-thin glass components have a good market prospect in the field of vehicle display screens. However, with the development of vehicle-mounted display devices in the direction of light weight, large screen, curved surface and high-definition, the entire high-end display industry is facing more and more "stuck neck" problems. High-performance display glass components have the characteristics of ultra-thinness, precision, and high quality, and require high-precision topography of special-shaped surfaces, no defects on the surface, and high consistency (high light transmittance and refractive index) to meet the needs of high-performance displays , which also significantly increases the difficulty of manufacturing large-scale and complex curved ultra-thin glass components.

For example, the patent application with the publication number "CN109205999A" discloses a high-efficiency processing method for 3D curved cover glass. The processing technology of the curved surface glass mainly has the following problems: (1) only U-shaped heating tubes are used as the source to directly heat the mold And glass blanks, there are problems such as weak controllability and large temperature gradient in the blank; (2) The mold closing time is too early, and the ultra-thin glass blank has not been softened in time, which is very easy to cause the ultra-thin glass to break due to the weight of the mold . In addition, the ultra-thin glass is hot-pressed using traditional techniques, which is prone to surface defects such as crystallization, holes, and cracks. The temperature sensitivity (0.5°C), stress tolerance (0.5Pa) and other aspects are very different from ordinary glass, and the traditional hot pressing process can only heat the whole quickly and non-uniformly, and cannot achieve local high The uniform heating and pressurization of the resolution leads to large temperature gradients, non-uniform stress distribution, severe glass rheology and other phenomena during the hot pressing process, which will directly affect the surface quality of hot pressing molding. There will also be large shape and position errors (such as flatness, radius of curvature, etc.), because the "temperature-pressure-position" control strategy of traditional hot pressing has slow response, low precision, and weak robustness, and it is difficult to accurately control and have significant size effects The temperature, pressure, displacement and other complex parameters in the hot pressing process of the ultra-thin glass can easily lead to the rebound of the ultra-thin glass on the curved surface, and the shape and position accuracy of hot pressing cannot be guaranteed. Therefore, the traditional thermoforming process and control methods for ordinary glass are not suitable for ultra-thin glass, and cannot meet the manufacturing needs of high-performance, large-size, special-shaped, curved ultra-thin glass with low defect and high shape and position accuracy.

In view of this, it is necessary to propose a new large-size ultra-thin glass member thermal bending forming device and method thereof, so as to better solve the above-mentioned technical problems.

Contents of the invention

In order to solve the above problems, the present invention provides a large-size ultra-thin glass component thermal bending forming device and its forming method, which can better perform large-scale ultra-thin glass component thermal bending processing, with high forming precision and high throughput rate. To meet the quality requirements of the ultra-thin glass component molding process.

The technical scheme adopted in the present invention is:

A large-size ultra-thin glass member heat bending forming device, including a control unit, a furnace cavity, a mold body, a support assembly, a load unit, a drive unit, a first heating assembly and a second heating assembly, the support assembly, the load The unit, the drive unit, the first heating assembly and the second heating assembly are respectively connected to the regulating unit;

The mold body includes a quartz upper mold and a quartz lower mold that can be connected by mold closing. The quartz upper mold and the quartz lower mold are respectively arranged in the furnace cavity, and the quartz upper mold and the quartz lower mold are closed. When the molds are connected, the molding cavity is formed around the set;

The supporting component is arranged on the quartz lower mold and connected with the quartz upper mold;

The drive unit is connected to the load unit, and the load unit is connected to the quartz lower mold;

The first heating component is arranged above the quartz upper mold, and the first heating component is heated by a laser light source;

The second heating assembly is arranged in the lower quartz mold.

In some embodiments, the light transmittance of the mold body is greater than 94%.

In some embodiments, the support assembly is provided with several support rods that can be automatically raised and lowered, and the quartz upper mold is provided with several grooves matching the support rods.

In some embodiments, the first heating component is provided with a laser and a reflector, and the light source emitted by the laser enters the mold body after adjusting the optical path by the reflector.

In some embodiments, the first heating component is further provided with a multiplier, and the light source after the light path is adjusted by the reflector is enhanced by the multiplier before being injected into the mold body.

In some embodiments, the laser is an ultrashort pulse laser, and the light source of the ultrashort pulse laser is a 1035nm infrared pulse laser.

In some embodiments, the second heating component is configured as a heating tube.

Based on the same inventive concept, this application also provides a large-size ultra-thin glass member thermal bending forming method, including the following steps:

S1. Determine the shape characteristics, and model the heating path characteristics according to the size characteristics of the ultra-thin glass blank to be hot-bent and formed;

S2, mold and sample loading, put the ultra-thin glass blank into the molding cavity, and place it on the quartz lower mold, and separate the quartz upper mold and the quartz lower mold through the support assembly;

S3, preheating, heating the mold body and the ultra-thin glass blank through the second heating component, so that the ultra-thin glass blank is heated to 2/3 of the temperature close to the softening point of the glass;

S4. Precisely control the laser, close the quartz upper mold and quartz lower mold to form a closed processing environment, and accurately heat through the second heating component according to the predetermined heating path to achieve controllable ultra-thin glass forming;

S5. Preliminary selection of processing parameters and trial processing, pre-processing of ultra-thin glass blanks, and adjustment of process parameters;

S6, batch processing and production.

In some embodiments, in step S4, the laser light source space-time shaping method is performed through the first heating component to perform precise heating, so as to realize the controllability of ultra-thin glass forming.

In some embodiments, the process parameters in step S5 include laser parameters, initial heating temperature, mold pressure and holding time.

The beneficial effects of the present invention are as follows:

1. The molding device provided by the present application includes a control unit, a furnace cavity, a mold body, a support assembly, a load unit, a drive unit, a first heating assembly and a second heating assembly, the support assembly, the load unit, and the drive unit . The first heating assembly and the second heating assembly are respectively connected to the control unit, which have a simple structure and a reasonable design. By setting the support assembly in this application, it is possible to avoid the The weight of the mold causes the ultra-thin glass to break. The temperature of the mold is controlled by the first heating component to achieve "coarse adjustment", and combined with laser control to quickly achieve "fine adjustment". Laser thermoforming control relies on its high controllability, non-contact, efficient and precise thermal It can directly focus on ultra-thin glass components to heat up, realize overall non-uniform heating, local accurate and high-resolution uniform heating and pressurization, and use laser non-contact methods to efficiently and accurately gather energy To the area that needs to be formed, and can also adjust the molecular arrangement structure and physical parameters of the glass through space-time shaping, quickly improve the macroscopic performance and controllability of ultra-thin glass forming, and effectively ensure the forming effect;

2. In the molding method provided by this application, the upper and lower quartz molds are first separated by the support assembly, and the glass blank is preliminarily heated until it reaches a temperature near the softening point, then the upper and lower molds are closed, and the mold body is used. The closed environment laser light path can be reached. With its high controllability, non-contact, efficient and accurate thermal state accumulation, it can directly focus on ultra-thin glass components for heating, and realize overall non-uniform heating, local accurate and high-resolution uniform heating, Pressurization, adjust the molecular arrangement structure and physical parameters of the glass through laser spatiotemporal shaping, improve the macroscopic performance and controllability of ultra-thin glass forming, and greatly improve the heating efficiency and temperature control accuracy of ultra-thin glass component hot bending forming , which improves surface defects such as crystallization, holes, and cracks caused by the temperature gradient caused by uneven heat transfer of the mold; in addition, laser composite hot bending reduces the high temperature heating of the original closed cavity, reducing energy Consumption, saving production costs.

Description of drawings

Fig. 1 is a schematic diagram of an exploded structure of a mold body, a support assembly and a glass blank in some embodiments of the present invention;

Fig. 2 is the structural representation of the quartz upper mold in some embodiments of the present invention;

Fig. 3 is a schematic diagram of the connection structure of the quartz lower mold and the support assembly in some embodiments of the present invention;

Figure 4 is a schematic structural view of a molding device in some embodiments of the present invention;

Fig. 5 is a schematic flow diagram of a molding method in some embodiments of the present invention;

Explanation of reference signs: 1. Furnace cavity, 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 component, 61. Laser, 611. Laser light path, 62. Reflector, 63. Multiplier, 7. Second heating component, 8. Glass blank.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Example 1

As shown in Figures 1 to 4, the large-size ultra-thin glass member thermal bending forming device described in this embodiment includes a control unit (not shown in the drawings), a furnace cavity 1, a mold body 2, a support assembly 3, a load Unit 4, driving unit 5, first heating assembly 6 and second heating assembly 7, the support assembly 3, the load unit 4, driving unit 5, the first heating assembly 6 and the second heating assembly 7 respectively connected to the control unit;

The mold body 2 includes a quartz upper mold 21 and a quartz lower mold 22 that can be connected by mold closing, and the quartz upper mold 21 and the quartz lower mold 22 are respectively arranged in the furnace cavity 1, and the quartz upper mold 21 When being connected with the quartz lower mold 22, a molding cavity 23 is formed around it;

The support assembly 3 is arranged on the quartz lower mold 22 and connected with the quartz upper mold 21;

The drive unit 5 is connected to the load unit 4, and the load unit is connected to the quartz lower mold 22;

The first heating assembly 5 is arranged above the quartz upper mold 21, and the first heating assembly 5 is heated by a laser light source;

The second heating assembly 5 is disposed in the lower quartz mold 22 .

The molding device provided in this embodiment can support and separate the upper and lower molds through the support assembly 3 during processing, so as to avoid the ultra-thin glass being broken due to the weight of the mold when the molding temperature of the glass blank 8 has not reached the vicinity of the softening point, and The second heating component 7 is used to control the temperature to achieve “coarse adjustment” of the temperature, combined with the first heating component 6 for laser regulation, to quickly realize “fine-tuning” heating, so that the energy can be efficiently and accurately concentrated to the required level through the laser non-contact method In addition, the molecular arrangement structure and physical parameters of the glass can be regulated through space-time shaping, so as to quickly improve the macroscopic performance and controllability of ultra-thin glass forming, and effectively ensure the forming effect.

Example 2

In this embodiment, specifically, wherein the quartz upper mold 21 and the quartz lower mold 22 are set as transparent molds with a light transmittance greater than 94%, so as to facilitate the passage of the laser light source for precise temperature regulation, The structure is simple and the temperature controllability is good.

Example 3

In this embodiment, the support assembly 3 is provided with several support rods that can be automatically lifted, and the quartz upper mold 21 is provided with a number of grooves 211 matching the support rods, specifically, it can be set as an automatic telescopic support rod , it can also be set as a one-to-one correspondence between the driving part and the support rod, and the lifting drive is carried out. During processing, the support rod can be inserted into the groove 211, and the support rod can be lifted and lowered to realize the quartz upper mold 21 and the quartz upper mold 22. separation or connection.

Example 4

In this embodiment, the first heating assembly 6 is provided with a laser 61 and a reflector 62. The light source emitted by the laser 61 is adjusted by the reflector 62 and then enters the mold body 1. The coordinated setting of the reflector 62 can realize the adjustment of the incident light path of the laser light source, thereby performing precise heating control.

The second heating assembly 7 is set as a heating tube. By setting the heating tube on the quartz lower mold 22, the quartz lower mold 22, the quartz upper mold 21, the glass blank 8 and the temperature of the molding environment can be initially heated to realize rough temperature adjustment. Preliminarily, the temperature of the entire closed environment is relatively balanced, and the heating is carried out through the heating tube, which has a simple structure, convenient control, and good heating stability.

Example 5

On the basis of the above-mentioned embodiments, the first heating assembly 6 in this embodiment is also provided with a multiplier 63, the reflector 62 adjusts the light source after the optical path, and after the energy is enhanced by the multiplier 63, then Injecting into the mold body 1, by adding a multiplier 63, the laser energy can be effectively enhanced, thereby ensuring the heating effect.

Specifically, the laser 61 is set as an ultrashort pulse laser, and the light source of the ultrashort pulse laser adopts 1035nm infrared pulse laser.

Example 6

In this embodiment, the surface cavity of the quartz upper mold 21 is consistent with the size of the upper surface of the large-scale ultra-thin glass member, and the surface cavity of the quartz lower mold 22 is consistent with the size of the lower surface of the large-size ultra-thin glass component, and The quartz upper mold 21 and the quartz lower mold 22 are set as transparent molds with a softening point temperature of 1780° C., a compressive strength of 690 MPa, and a light transmittance greater than 94%.

Specifically, referring to Fig. 1-Fig. 3, the supporting assembly 3 is provided with six supporting rods, and correspondingly provided with six grooves 211 on the quartz upper mold 21, and the six supporting rods are arranged in pairs on the quartz upper mold 21 is symmetrically arranged in cross-section along the length direction; the support rods are respectively coordinated and controlled by six driving motors to realize vertical lifting and avoid ultra-thin glass breakage due to the weight of the mould, and the ultrashort pulse laser laser is placed above the quartz upper mold 21 , the laser 61 is an ultrashort pulse laser and is arranged horizontally. The light source is a 1035nm infrared pulse laser. The ultrashort pulse laser emits laser light in the horizontal direction. The forming cavity 23, the laser optical path 611 reaches the maximum energy after passing through the multiplier 63, and directly irradiates the ultra-thin glass blank 8 through the upper quartz mold 21, and heats a specific area of it. After the heating temperature reaches the bending temperature , and then the load unit 4 is driven by the drive unit 5 to drive the quartz lower mold 22 to move upwards, and complete mold clamping with the quartz upper mold 21 .

In this embodiment, after preliminary heating of the glass blank 8, the laser light path 611 in a closed environment can be reached by using the mold body 2, and the ultra-thin glass member can be directly focused by virtue of the high controllability, non-contact, high-efficiency and accurate thermal accumulation of the laser Heating up to achieve overall non-uniform heating, local precise high-resolution uniform heating and pressurization, and adjusting the molecular arrangement structure and physical parameters of the glass through laser space-time shaping to improve the macroscopic performance and controllability of ultra-thin glass forming , which greatly improves the heating efficiency and temperature control accuracy of ultra-thin glass components, and improves the surface defects such as crystallization, holes, and cracks caused by the temperature gradient caused by uneven heat transfer of the mold; in addition, Laser composite hot bending reduces the high-temperature heating of the original closed cavity, reduces energy consumption, and saves production costs.

The following is the method for hot bending and forming of large-size ultra-thin glass provided by this application, including the following steps:

S1. Determine the shape characteristics, and model the heating path characteristics according to the size characteristics of the ultra-thin glass blank 8 to be formed by hot bending, that is, model the scanning path characteristics of the laser light source;

S2, mold and sample loading, put the ultra-thin glass blank 8 into the molding cavity 23, and be located at the quartz lower mold 22, and make the quartz upper mold 21 and the quartz lower mold 22 through the support assembly 3 spaced apart;

S3, preheating, heating the mold body 2 and the ultra-thin glass blank 8 through the second heating assembly 7, so that the ultra-thin glass blank 8 is heated to 2/3 of the temperature close to the softening point of the glass;

S4. Precise control of the laser. The quartz upper mold 21 and the quartz lower mold 22 are closed to form a closed processing environment. According to the predetermined heating path, the first heating component 6 is used to perform time-space shaping of the laser light source for precise heating to achieve ultra-thin. Glass forming controllability;

S6. Preliminary selection of processing parameters and trial processing, preprocessing of the ultra-thin glass blank 8, adjustment and optimization of process parameters, wherein the process parameters include laser parameters, initial heating temperature, mold pressure and holding time;

S6, batch processing and production.

Specifically, the molding pressure is controlled by driving the load unit 4 through the driving unit 5 to apply pressure to the quartz lower mold 22 .

The molding method of the present application has simple steps and easy processing. During the molding process, the laser light path in a closed environment is accessible by using the mold body 2, "coarse adjustment" is realized through heating control temperature, and "fine adjustment" is realized in combination with laser regulation. Laser thermoforming control realizes overall non-uniform heating, local precise and high-resolution uniform heating and pressure, that is, through laser non-contact, energy can be efficiently and accurately concentrated to the area that needs to be formed, and it can be shaped through time and space. Regulate the molecular arrangement structure and physical parameters of glass, improve the macroscopic performance and controllability of ultra-thin glass forming, and realize high forming precision and good forming stability of large-size ultra-thin glass thermal bending forming processing components.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on 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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