Hot bending process of curved glass

Abstract

The application provides a thermal bending process of curved glass. The thermal bending process of the curved glass comprises the following steps: obtaining a flat glass blank; performing negative pressure cavity forming treatment on the flat glass blank by using a graphite mold, so that the periphery of the flat glass blank abuts against the periphery of the mold to form a negative pressure cavity, wherein the graphite mold is formed with pores, the porosity is 10%-20%, and the pore diameter is 0.6-0.9 um; performing preheating treatment on the flat glass blank after the negative pressure cavity forming treatment; performing vacuum heat bending treatment on the preheated negative pressure cavity, so that the negative pressure cavity forms a negative pressure; and performing heat forming operation on the flat glass blank after the vacuum heat bending treatment, to obtain the curved glass. The thermal bending process of the curved glass can effectively reduce the processing difficulty of the curved glass, and can ensure the flatness of the curved glass.

Description

Technical Field

[0001] This invention relates to the field of glass processing technology, and in particular to a hot bending process for curved glass. Background Technology

[0002] Hot bending of curved glass typically involves using an upper and lower mold to heat-press and bend a flat glass blank. However, this method can easily cause mold adhesion to form on the curved glass. Therefore, existing methods utilize vacuum adsorption to achieve hot bending of curved glass, such as the Chinese invention patent application No. 201811155443.2. This method uses a graphite mold with a porosity greater than or equal to 12% and less than or equal to 40%, and employs upper and lower heating plates to heat the curved glass. The lower heating plate's vacuum treatment forces the flat glass blank to adhere tightly to the mold during hot bending. However, because the graphite mold has a boss shape, the hot bending of the curved glass still relies on… Precise temperature control causes localized softening of the curved glass, which then sinks under gravity and approaches the graphite mold. There, it is attracted by vacuum suction and adheres tightly to the surface of the mold. In essence, the technology is similar to gravity settling, except that it ensures the flat glass fits the graphite mold more closely. However, the addition of a flexible upper heating plate indicates that, like gravity settling, it places strict requirements on the temperature curve and time during the heating and bending of the flat glass blank. Otherwise, excessively high local temperatures can cause deformation and scrapping of the thermoplastic glass, making the processing of curved glass still quite challenging. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hot bending process for curved glass that can effectively reduce the processing difficulty of curved glass and ensure the flatness of curved glass.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A hot bending process for curved glass includes the following steps:

[0006] Obtain a flat glass blank;

[0007] A graphite mold is used to form a negative pressure cavity on the flat glass blank, so that the periphery of the flat glass blank abuts against the periphery of the mold to form a negative pressure cavity. The graphite mold is porous with a porosity of 10%-20% and a pore size of 0.6um-0.9um.

[0008] The planar glass blank after the negative pressure cavity formation process is preheated.

[0009] The preheated negative pressure cavity is subjected to vacuum hot bending treatment to create a negative pressure in the negative pressure cavity;

[0010] The flat glass blank, after vacuum hot bending, is subjected to thermoforming to obtain curved glass.

[0011] In one embodiment, the planar glass blank after the negative pressure cavity formation process is preheated to continuously raise the temperature of the planar glass blank to near the deformation point temperature.

[0012] In one embodiment, the deformation point temperature is 650°C-800°C.

[0013] In one embodiment, the flat glass blank after vacuum hot bending is subjected to thermoforming treatment so that the temperature of the flat glass blank continues to rise to near the softening point temperature.

[0014] In one embodiment, the softening point temperature is 800°C-1000°C.

[0015] In one embodiment, a forming groove is provided on one side of the mold, and the flat glass blank is placed in the forming groove. When the flat glass blank is placed in the forming groove, the flat glass blank covers the forming groove to form a negative pressure cavity, and the periphery of the flat glass blank is located on the outer periphery of the forming groove and abuts against the graphite mold.

[0016] In one embodiment, after the step of thermoforming the flat glass blank after vacuum hot bending, the hot bending process of the curved glass further includes the following steps:

[0017] The curved glass is then cooled.

[0018] In one embodiment, the curved glass is cooled, specifically by:

[0019] The curved glass is subjected to staged cooling, so that the curved glass is cooled down three times in succession for equal duration.

[0020] In one embodiment, the preheating treatment of the planar glass blank after the negative pressure cavity formation process specifically includes:

[0021] The planar glass blank is preheated in stages, so that the planar glass blank is preheated and heated three times in succession for equal duration.

[0022] In one embodiment, before the step of preheating the planar glass blank after the negative pressure cavity formation process, and after the step of forming the negative pressure cavity using a graphite mold on the planar glass blank, the hot bending process of the curved glass further includes the following steps:

[0023] The graphite mold is subjected to circumferential transfer processing so that the graphite mold is connected to the flat glass blank and is sequentially transferred along the circumference to perform preheating treatment and thermoforming operations.

[0024] Compared with the prior art, the present invention has at least the following advantages:

[0025] The hot bending process for curved glass of this invention uses a graphite mold to form a negative pressure cavity on a flat glass blank, so that the periphery of the flat glass blank abuts against the periphery of the mold. This creates a negative pressure cavity with a certain sealing effect on the flat glass blank placed on the graphite mold. The flat glass blank is then preheated to ensure sufficient heating. The graphite mold, with a porosity of 10%-20% and a pore size of 0.6µm-0.9µm, provides a strong adsorption force between the graphite mold and the flat glass blank. This allows bending to occur under the strong adsorption force of the graphite mold near the flat glass blank after further heating. Finally, the preheated negative pressure cavity is subjected to a vacuum hot bending process, further enhancing the adhesion between the graphite mold and the flat glass blank. It possesses high adsorption strength, which, combined with the preheating treatment of the flat glass blank after the negative pressure chamber is formed, allows for simultaneous adsorption and bending deformation under further heating of the flat glass blank. This enables the flat glass blank to effectively bend and deform and adhere to the surface of the graphite mold, thus ensuring that the graphite mold can effectively adsorb and bend the flat glass blank while effectively reducing the processing difficulty of curved glass, even when using a general hot-pressing bending process for flat glass blanks. In addition, the pores of the graphite mold are obtained by graphite compaction. The compaction density determines the porosity and pore size of the graphite mold. Its pores are mostly curved, i.e., non-linear, so that the negative pressure formed at the pores generates more component forces that have a multi-angle attraction effect on the curved glass, making the attraction force on the curved glass more even and thus improving the surface flatness of the curved glass. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flowchart of a hot bending process for curved glass according to an embodiment of the present invention.

[0028] Figure 2This is a schematic diagram of the structure of a hot bending device for curved glass according to an embodiment of the present invention;

[0029] Figure 3 for Figure 2 A magnified view of part A of the hot bending equipment for the curved glass shown.

[0030] Figure 4 for Figure 2 A partial view of the hot bending equipment for the curved glass shown.

[0031] Figure 5 for Figure 2 A partial sectional view of the hot bending equipment for the curved glass shown.

[0032] Figure 6 for Figure 2 Another partial cross-sectional view of the hot bending equipment for the curved glass shown.

[0033] Figure 7 for Figure 2 Another schematic diagram of the hot bending equipment for the curved glass shown.

[0034] Figure 8 for Figure 2 Another partial cross-sectional view of the hot bending equipment for the curved glass shown.

[0035] Figure 9 for Figure 8 A partial sectional view at point B of the hot bending equipment for the curved glass shown.

[0036] Figure 10 for Figure 8 A partial cross-sectional view at point C of the hot bending equipment for the curved glass shown.

[0037] Figure 11 for Figure 2 Another partial view of the hot bending equipment for the curved glass shown.

[0038] Figure 12 for Figure 2 Another partial view of the hot bending equipment for the curved glass shown.

[0039] Figure 13 for Figure 2 Another partial cross-sectional view of the hot bending equipment for the curved glass shown.

[0040] Figure 14 for Figure 2 Another partial view of the hot bending equipment for the curved glass shown.

[0041] Figure 15 for Figure 2 Another partial view of the hot bending equipment for the curved glass shown.

[0042] Figure 16 for Figure 2 Another partial view of the hot bending equipment for the curved glass shown. Detailed Implementation

[0043] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0044] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] This application provides a hot bending process for curved glass. The hot bending process for curved glass includes the following steps: obtaining a flat glass blank; using a graphite mold to form a negative pressure cavity on the flat glass blank, so that the periphery of the flat glass blank abuts against the periphery of the mold to form a negative pressure cavity, wherein the graphite mold is porous with a porosity of 10%-20% and a pore size of 0.6um-0.9um; preheating the flat glass blank after the negative pressure cavity formation treatment; performing a vacuum hot bending treatment on the preheated negative pressure cavity to form a negative pressure in the negative pressure cavity; and performing a thermoforming operation on the flat glass blank after the vacuum hot bending treatment to obtain curved glass.

[0047] The aforementioned hot bending process for curved glass involves using a graphite mold to create a negative pressure cavity on a flat glass blank. This allows the periphery of the flat glass blank to abut against the periphery of the mold, forming a negative pressure cavity with a certain sealing effect. The flat glass blank is then preheated, ensuring sufficient heating. The graphite mold, with its porous structure (10%-20% porosity and 0.6µm-0.9µm pore size), provides a strong adsorption force between the graphite mold and the flat glass blank. This allows bending to occur under this strong adsorption force after further heating. Finally, the preheated negative pressure cavity undergoes a vacuum hot bending process, further enhancing the adhesion between the graphite mold and the flat glass blank. It possesses high adsorption strength, which, combined with the preheating treatment of the flat glass blank after the negative pressure chamber is formed, allows for simultaneous adsorption and bending deformation under further heating of the flat glass blank. This enables the flat glass blank to effectively bend and deform and adhere to the surface of the graphite mold, thus ensuring that the graphite mold can effectively adsorb and bend the flat glass blank while effectively reducing the processing difficulty of curved glass, even when using a general hot-pressing bending process for flat glass blanks. Furthermore, the pores of the graphite mold are obtained by graphite compaction, and the compaction density determines the porosity and pore size of the graphite mold. Many of its pores are curved, i.e., non-linear, so that the negative pressure formed at the pores generates more component forces that have a multi-angle attraction effect on the curved glass, thus averaging the attraction force on all parts of the curved glass and improving the surface flatness of the curved glass.

[0048] To better understand the hot bending process of curved glass in this application, the following further explanation of the hot bending process of curved glass in this application is provided:

[0049] Please see Figure 1 One embodiment of the hot bending process for curved glass includes the following steps:

[0050] S100, Obtain a flat glass blank.

[0051] S200. A negative pressure cavity is formed on a flat glass blank using a graphite mold, so that the periphery of the flat glass blank abuts against the periphery of the mold to form a negative pressure cavity. The graphite mold is porous with a porosity of 10%-20% and a pore size of 0.6um-0.9um. It is understandable that the graphite mold has multiple pores, with a porosity of 10%-20% and a pore size of 0.6um-0.9um. This allows for negative pressure treatment of the graphite mold—that is, when a flat glass blank is placed on the graphite mold to form a negative pressure cavity, and air is evacuated from the side of the graphite mold away from the flat glass blank—to promote a high degree of adsorption force between the side of the graphite mold and the flat glass blank. This effectively ensures that even when using a general hot-pressing bending process for flat glass blanks, the processing difficulty of curved glass is effectively reduced, while achieving effective adsorption and bending of the flat glass blank by the graphite mold. In addition, it should be noted that the graphite mold is obtained by graphite compaction molding, and the compaction density determines the porosity and pore size of the graphite mold. It is understandable that if the pores of the graphite mold are obtained through laser etching, it means that the pores on the graphite mold are linear pores. In this case, when the curved glass is formed and is pressed tightly against the graphite mold, the negative pressure formed at the pores has a vertical attraction effect on the cut surface of the curved glass, which can easily cause the surface of the curved glass to be uneven. However, if the pores are formed by compaction, the pores are mostly curved, that is, non-linear. This causes the negative pressure formed at the pores to form more component forces that have a multi-angle attraction effect on the curved glass, making the attraction force on the curved glass more even and thus improving the surface flatness of the curved glass.

[0052] S300. Preheating treatment is performed on the flat glass blank after the negative pressure cavity is formed. It can be understood that after the flat glass blank is placed on the graphite mold to form a negative pressure cavity, the flat glass blank is then preheated. This better ensures that the flat glass blank is fully heated, and then the graphite mold has a high adsorption force on the flat glass blank on the side close to the flat glass blank, allowing the flat glass blank to be effectively bent and deformed and attached to the surface of the graphite mold.

[0053] S400. The preheated negative pressure cavity is subjected to vacuum hot bending treatment to create a negative pressure within the cavity. It can be understood that after preheating, the flat glass blank can be bent under the strong adsorption force of the graphite mold on the side closest to the flat glass blank after further heating. Therefore, vacuuming the negative pressure cavity at this point ensures that the side of the graphite mold closest to the flat glass blank has a strong adsorption force on the flat glass blank. This allows for simultaneous adsorption bending deformation under further heating of the flat glass blank, which helps ensure the gradual and slow bending deformation of the flat glass blank, thus better ensuring the processing yield of curved glass.

[0054] S500: The flat glass blank after vacuum hot bending is thermoformed to obtain curved glass. This is well coordinated with the vacuuming of the negative pressure chamber first, which realizes the gradual and slow bending deformation of the flat glass blank, thereby ensuring the processing yield of curved glass.

[0055] The aforementioned hot bending process for curved glass involves using a graphite mold to create a negative pressure cavity on a flat glass blank. This allows the periphery of the flat glass blank to abut against the periphery of the mold, forming a negative pressure cavity with a certain sealing effect. The flat glass blank is then preheated, ensuring sufficient heating. The graphite mold, with its porous structure (10%-20% porosity and 0.6µm-0.9µm pore size), provides a strong adsorption force between the graphite mold and the flat glass blank. This allows bending to occur under this strong adsorption force after further heating. Finally, the preheated negative pressure cavity undergoes a vacuum hot bending process, further enhancing the adhesion between the graphite mold and the flat glass blank. It possesses high adsorption strength, which, combined with the preheating treatment of the flat glass blank after the negative pressure chamber is formed, allows for simultaneous adsorption and bending deformation under further heating of the flat glass blank. This enables the flat glass blank to effectively bend and deform and adhere to the surface of the graphite mold, thus ensuring that the graphite mold can effectively adsorb and bend the flat glass blank while effectively reducing the processing difficulty of curved glass, even when using a general hot-pressing bending process for flat glass blanks. Furthermore, the pores of the graphite mold are obtained by graphite compaction, and the compaction density determines the porosity and pore size of the graphite mold. Many of its pores are curved, i.e., non-linear, so that the negative pressure formed at the pores generates more component forces that have a multi-angle attraction effect on the curved glass, thus averaging the attraction force on all parts of the curved glass and improving the surface flatness of the curved glass.

[0056] In one embodiment, the planar glass blank after the negative pressure chamber formation process is preheated to continuously raise its temperature to near the deformation point temperature. Further, the near deformation point temperature is 3°C-10°C lower than the deformation point temperature. Further, the deformation point temperature is 650°C-800°C, which effectively achieves simultaneous adsorption bending deformation under further heating of the planar glass blank. Further, a preheating mechanism is used to preheat the planar glass blank.

[0057] In one embodiment, the flat glass blank after the negative pressure chamber formation process is preheated. Specifically, the flat glass blank is preheated in stages, so that the flat glass blank undergoes three consecutive preheating cycles of equal duration. Further, a first preheating component, a second preheating component, and a third preheating component are used to preheat the flat glass blank in stages, so that the flat glass blank undergoes three consecutive preheating cycles of equal duration at the first, second, and third preheating components, respectively. In one embodiment, the flat glass blank after vacuum hot bending is thermoformed, so that the temperature of the flat glass blank continues to rise to near its softening point temperature. Further, near the softening point temperature is 10°C-20°C lower than the softening point temperature. Further, the softening point temperature is 800°C-1000°C, which effectively achieves further heating of the flat glass blank, realizes the gradual and slow bending deformation of the flat glass blank, and thus better ensures the processing yield of curved glass. Furthermore, a forming mechanism is used to thermoform the flat glass blank.

[0058] In one embodiment, after the step of thermoforming the flat glass blank after vacuum hot bending, the hot bending process of the curved glass further includes the step of cooling the curved glass. Further, a cooling mechanism is used to cool the curved glass.

[0059] In one embodiment, the curved glass is cooled in stages, specifically by sequentially cooling the curved glass three times for equal durations. Further, a first cooling assembly, a second cooling assembly, and a third cooling assembly are used to perform staged cooling of the curved glass, so that the flat glass blank is sequentially cooled three times for equal durations at each of the three cooling assemblies, ensuring that the temperature of the curved glass is reduced to at least below the deformation point temperature.

[0060] In one embodiment, a forming groove is provided on one side of the mold, and a flat glass blank is placed in the forming groove. When the flat glass blank is placed in the forming groove, the flat glass blank covers the forming groove to form a negative pressure cavity, and the periphery of the flat glass blank is located on the outer periphery of the forming groove and abuts against the graphite mold, which better ensures the adsorption strength of the graphite mold on the flat glass blank.

[0061] In one embodiment, before the step of preheating the flat glass blank after the negative pressure cavity formation process, and after the step of forming the negative pressure cavity on the flat glass blank using a graphite mold, the hot bending process of curved glass further includes the following step: circumferentially transferring the graphite mold so that the graphite mold, together with the flat glass blank, is sequentially transferred circumferentially to the preheating and thermoforming operations. Further, a turntable transfer structure is used for the circumferential transfer of the graphite mold.

[0062] To better understand the hot bending process of curved glass in this application, the hot bending equipment for curved glass is described in detail below:

[0063] Please refer to the following: Figure 2 , Figure 7 and Figure 13 One embodiment of the curved glass hot bending equipment 10 includes a mounting platform 100, a hot bending furnace chamber 200, a turntable conveyor structure 300, a hot bending structure 400, and at least three molds 500. The hot bending furnace chamber 200 is mounted on the mounting platform 100. The turntable conveyor structure 300 is disposed within the hot bending furnace chamber 200 and is rotatably connected to the hot bending furnace chamber 200. The hot bending structure 400 includes a preheating mechanism 410, a forming mechanism 420, and a cooling mechanism 430, which are sequentially arranged on the hot bending furnace chamber 200 along the transmission direction of the turntable conveyor structure 300. The three molds 500 are respectively arranged in a one-to-one correspondence with the preheating mechanism 410, the forming mechanism 420, and the cooling mechanism 430, and are sequentially arranged on the turntable conveyor structure 300 along the transmission direction of the turntable conveyor structure 300.

[0064] The aforementioned curved glass hot bending equipment 10 arranges three molds 500 corresponding to the preheating mechanism 410, forming mechanism 420, and cooling mechanism 430, respectively. These molds 500 are sequentially arranged on the turntable conveyor structure 300 along its transmission direction. The preheating mechanism 410, forming mechanism 420, and cooling mechanism 430 are also sequentially arranged on the hot bending furnace chamber 200 along the same direction. This allows for the circumferential transfer of curved glass for reflow processing, automating the processing of irregularly shaped curved glass and avoiding the need for additional reflow lines. The sequential circumferential arrangement of the preheating mechanism 410, forming mechanism 420, and cooling mechanism 430 within the hot bending furnace chamber 200 effectively miniaturizes the overall structure of the curved glass hot bending equipment 10, resulting in a smaller footprint and improved usability for various applications.

[0065] Please refer to the following: Figures 8 to 11 In some embodiments, the turntable transmission structure 300 includes a return plate 310 and a drive roller 320. The return plate 310 is sleeved on the drive roller 320, which is rotatably connected to the hot bending furnace chamber 200. At least a portion of the drive roller 320 protrudes from the hot bending furnace chamber 200 and is used to connect to the power output end of the turntable drive 330. Further, at least three dies 500 are sequentially arranged on the return plate 310 along the rotation direction of the return plate 310, with any one die 500 located on the outer periphery of the drive roller 320. It is understood that the return plate 310 is sleeved on the transmission roller 320, and the transmission roller 320 is connected to the power output end of the turntable drive 330, so that the turntable drive 330 drives the transmission roller 320 to rotate, thereby realizing the circumferential rotation of the return plate 310. This allows the glass blank to be hot-bent on the mold 500 as it passes through the preheating mechanism 410, the forming mechanism 420, and the cooling mechanism 430 in sequence with the return plate 310. This effectively realizes the automated processing of glass blanks by circumferential transmission, which not only has a simple structure but also effectively realizes the miniaturization of the hot bending equipment 10 for curved glass, that is, effectively reduces the overall footprint of the hot bending equipment 10 for curved glass, thereby improving the versatility of the hot bending equipment 10 for curved glass.

[0066] Please refer to the following: Figures 8 to 11 In some embodiments, the turntable transmission structure 300 further includes a turntable drive 330, which is connected to the mounting platform 100 or the hot bending furnace chamber 200. The power output end of the turntable drive 330 is connected to the end of the turntable drive 330 away from the return plate 310. Further, the turntable drive 330 is connected to the outer wall of the hot bending chamber. Further, the turntable drive 330 is an F-series parallel shaft helical gear reducer motor.

[0067] Please refer to the following: Figures 8 to 11 In some embodiments, the transmission roller 320 includes a roller 321 and a transmission transition body 322. A return disk 310 is sleeved on the roller 321, and the roller 321 is rotatably connected to the hot bending furnace chamber 200. One end of the transmission transition body 322 is connected to the end of the roller 321 away from the return disk 310, and the other end of the transmission transition body 322 is connected to the power output end of the turntable drive 330. The transmission transition body 322 is positioned away from the mounting platform 100. Further, the transmission transition body is a gearbox. It can be understood that, while ensuring the structural strength of the turntable transmission structure 300, the adjustability of the turntable transmission structure 300's rotational speed is well ensured.

[0068] Please refer to the following: Figures 8 to 11In some embodiments, the roller 321 includes a roller body 3211, a first rotating auxiliary body 3212, and a second rotating auxiliary body 3213. A return plate 310 is sleeved on the roller body 3211. The first rotating auxiliary body 3212 and the second rotating auxiliary body 3213 are both connected to the two ends of the roller body 3211. The first rotating auxiliary body 3212 is engaged with the hot bending furnace chamber 200, and the second rotating auxiliary body 3213 abuts against the hot bending furnace chamber 200. Both the first rotating auxiliary body 3212 and the second rotating auxiliary body 3213 are rotatably connected to the hot bending furnace chamber 200. A transmission transition body 322 is connected to the end of the roller body 3211 away from the return plate 310. Further, a first sealing element 3214 is sandwiched between the first rotating auxiliary body 3212 and the hot bending furnace chamber 200. Further, a second sealing element 3215 is sandwiched between the second rotating auxiliary body 3213 and the hot bending furnace chamber 200. Furthermore, both the first and second seals are sealing rings. This improves the rotational stability of the roller 321 and better ensures the sealing performance of the hot bending furnace chamber 200.

[0069] Please refer to the following: Figures 8 to 11 In some embodiments, the return plate 310 includes a turntable rigid member 311 and at least three base supports 312. The turntable rigid member 311 is sleeved on the drive roller 320. At least three through areas 301 are formed on the turntable rigid member 311, and these through areas 301 are arranged sequentially at intervals along the rotation direction of the turntable rigid member 311. At least three base supports 312 are correspondingly disposed at the at least three through areas 301, and each base support 312 is connected to the turntable rigid member 311. Further, at least three molds 500 are correspondingly placed on the at least three base supports 312. Further, the turntable rigid member 311 is sleeved on the roller body 3211. It can be understood that the turntable rigid member 311 effectively ensures the structural strength of the return plate 310, while the base supports 312, used to place the molds 500, effectively improve the placement stability of the molds 500.

[0070] In some embodiments, the mold is a graphite mold (hereinafter referred to as 500 in the accompanying drawings) with a porosity of 10%-20% and a pore size of 0.6µm-0.9µm. Further, the pore size of the graphite mold is 0.8µm. Further, the resistivity of the graphite mold is 16µΩ·M to 20µΩ·M. It should be noted that the graphite mold is obtained by graphite compaction molding, and the compaction density determines the porosity and pore size of the graphite mold. It is understandable that if the pores of the graphite mold are obtained through laser etching, the pores on the graphite mold are linear. This means that when curved glass is formed and adheres tightly to the graphite mold, the negative pressure generated at the pores has a vertical attraction effect on the cut surface of the curved glass, easily causing unevenness on the surface of the curved glass. However, if the pores are formed by compaction, the pores are mostly curved, i.e., non-linear. This allows the negative pressure generated at the pores to form more components, attracting the curved glass at multiple angles, thus evening out the attraction force across the curved glass and improving the surface flatness. Therefore, a graphite mold with a porosity of 10%-20% and a pore size of 0.6µm-0.9µm effectively ensures the adsorption strength of the graphite mold on the glass blank.

[0071] Please see Figure 13 In some embodiments, a bending groove 501 is formed on the graphite mold 500, which is used to place the glass blank. Further, when the glass blank is placed on the graphite mold 500, the glass blank covers the bending groove 501 to form a negative pressure cavity 502, and the periphery of the glass blank is located on the outer periphery of the bending groove 501 and abuts against the graphite mold 500. Further, the bottom of the bending groove 501 includes a horizontal portion 5011, a first transition portion 5012, a second transition portion 5013, a first wedge-shaped portion 5014, and a second wedge-shaped portion 5015. The first wedge-shaped portion 5014, the first transition portion 5012, the horizontal portion 5011, the second transition portion 5013, and the second wedge-shaped portion 5015 are arranged linearly and connected sequentially. Both the first wedge-shaped portion 5014 and the second wedge-shaped portion 5015 are oriented away from the horizontal portion 5011. It is understandable that by placing the glass blank on the bending groove 501 to form a negative pressure cavity 502, even when vacuuming is performed on the side of the graphite mold 500 away from the bending groove 501, a negative pressure can be effectively formed in the negative pressure cavity 502. Since the periphery of the glass blank is located on the outer periphery of the bending groove 501 and abuts against the graphite mold 500, the glass blank can be well adsorbed by the graphite mold 500 during hot bending. Thus, under the operation of general hot pressing process of curved glass, the glass blank can be well adsorbed and deformed to stick tightly to the surface of the graphite mold 500, which better ensures the processing effect of curved glass under relatively simple curved glass processing operation.

[0072] Please refer to the following: Figures 10 to 12 In some embodiments, the base 312 has a placement groove 302, and the graphite mold 500 is placed in the placement groove 302, which further improves the placement stability of the graphite mold 500.

[0073] Please refer to the following: Figures 11 to 13 In some embodiments, the base 312 is further provided with an air inlet 303, an air outlet 304, and a connecting channel 305. Both the air inlet 303 and the air outlet 304 are connected to the connecting channel 305. The graphite mold 500 is detachably connected to the base 312 to form a suction chamber 503, which is connected to the air inlet 303. The air outlet 304 is disposed away from the graphite mold 500. Further, the graphite mold 500 is detachably connected to the placement groove 302 to form the suction chamber 503. It can be understood that the base 312 is provided with an air inlet 303, an air outlet 304, and a connecting channel 305, and the air inlet 303 is connected to the suction chamber 503 at the graphite mold 500. This better ensures the smooth formation of the negative pressure state at the negative pressure chamber 502 of the graphite mold 500, improving the ease of use of the curved glass hot bending equipment 10.

[0074] In some embodiments, the placement slot is used to hold at least two graphite molds. Further, the connecting channel includes a main flow channel and at least two branch flow channels, the main flow channel being connected to an outlet, and each branch flow channel being connected to the main flow channel; the number of inlets is at least two, and each of the at least two branch flow channels is connected to one of the at least two inlets. Further, each of the at least two inlets is connected to the suction chamber of one of the at least two graphite molds. This improves the efficiency of hot bending of the glass blank.

[0075] Please refer to the following: Figures 2 to 4 In some embodiments, the forming mechanism 420 includes a vacuum extraction component 421, which is connected to the hot bending furnace chamber 200 and correspondingly disposed with the base 312. The vacuum extraction component 421 is also movably connected to the air outlet 304 to extract air from the connecting channel 305, thereby sequentially forming negative pressure in the extraction chamber 503 and the negative pressure chamber 502. It should be noted that the vacuum extraction component 421 in the forming mechanism 420, together with the base 312 and the graphite mold 500, performs vacuum adsorption bending on the glass blank, effectively realizing the forming of the glass blank.

[0076] Please refer to the following: Figures 2 to 4In some embodiments, the vacuum pumping assembly 421 includes a mounting frame 4211 and a pumping pipe 4212. The mounting frame 4211 is mounted on the hot bending furnace chamber 200 and is correspondingly arranged with the base support 312. The pumping pipe 4212 is movably connected to the mounting frame 4211 and is used to communicate with a pumping pump and is movably connected with the outlet 304.

[0077] Please refer to the following: Figures 1 to 3 In some embodiments, the vacuum pumping assembly 421 further includes a pump (not shown) mounted on the mounting bracket 4211 or the hot bending furnace chamber 200, and the pump is connected to the pumping pipe 4212.

[0078] Please refer to the following: Figures 2 to 4 In some embodiments, the vacuum pumping assembly 421 further includes a lifting drive 4213, which is mounted on the fixed frame 4211. The power output end of the lifting drive 4213 is connected to the suction pipe 4212, and the lifting drive 4213 drives the suction pipe 4212 to move towards or away from the base support 312. Further, when the lifting drive 4213 drives the suction pipe 4212 towards the base support 312 until it abuts against the base support 312, the other end of the suction pipe 4212 is connected to the air outlet 304. It can be understood that allowing the lifting drive 4213 to drive the suction pipe 4212 towards or away from the base support 312 reduces the mechanical interference of the vacuum pumping assembly 421 on the rotation of the return plate 310. This not only simplifies the structure but also better ensures the suitability of the vacuum pumping assembly 421 for automated processing of glass blanks using a circumferential transmission processing method.

[0079] Please refer to the following: Figures 2 to 4 In some embodiments, a sealing ring 4214 is provided on the peripheral wall of the suction pipe 4212. Furthermore, when one end of the suction pipe 4212 is connected to the air outlet 304, the sealing ring 4214 is sandwiched between the base 312 and the outer wall of the suction pipe 4212, which improves the rate and smoothness of the formation of the negative pressure state in the negative pressure chamber 502 of the graphite mold 500.

[0080] Please refer to the following: Figure 4 and Figure 16In some embodiments, the forming mechanism 420 includes a direct heating mechanism 422. Further, the direct heating mechanism 422 includes a radiant heating plate 4221 and a power supply component 4222. The radiant heating plate 4221 is connected to the hot bending furnace chamber 200 and is positioned opposite to the corresponding graphite mold 500. The power supply component 4222 is connected to the hot bending furnace chamber 200 or the mounting platform 100, and is at least partially located within the hot bending furnace chamber 200 and electrically connected to the radiant heating plate 4221. Further, in the direction of gravity, the base support 312 and the radiant heating plate 4221 are arranged linearly in sequence. Further, the base support is a high-purity graphite base support, i.e., the base support 312 is prepared using high-purity graphite and has good thermal conductivity. Further, the radiant heating plate 4221 is insulated from the hot bending furnace chamber 200. It is understandable that, in the direction of gravity, the base 312 and the radiant heating plate 4221 are arranged linearly in sequence, while the graphite mold 500 is placed on the base 312. This allows the base 312 to effectively improve the heat transfer efficiency during preheating when the radiant heating plate 4221 radiates heat to the base 312. Furthermore, the base 312 buffers the addition of the graphite mold 500, meaning that the temperature of the base 312 rises only after its own temperature has risen, and the temperature of the graphite mold 500 is further increased through heat transfer. This achieves a slow heating of the glass blank inside the graphite mold 500, ensuring the preparation effect of the curved glass.

[0081] It should be noted that a radiant heating plate typically consists of a heating element, a radiant plate, and a controller. The heating element is the main component of the entire system, generating heat using electrical energy. The radiant plate is usually made of metal and radiates heat. The controller adjusts the heating power and temperature of the heating element, allowing the heating capacity of the heating plate to be adjusted as needed. The radiant heating plate in this application is a common type used for radiant heating of curved glass; therefore, its structure will not be described in detail here. This application does not limit the structure of the radiant heating plate, but only protects its positional and connection relationships. The power supply component is a common power supply structure used for radiant heating plates; therefore, its structure will not be described in detail here. The power supply component is placed on the ground and corresponds to the radiant heating plate when radiantly heating the base. This application does not limit the structure of the power supply component, but only protects its structural and positional relationships.

[0082] Please refer to the following: Figure 2 , Figure 14 and Figure 16In one embodiment, the hot bending structure 400 further includes a feeding and discharging mechanism 440, which is disposed between the cooling mechanism 430 and the preheating mechanism 410. The feeding and discharging mechanism 440, together with the preheating mechanism 410, the forming mechanism 420, and the cooling mechanism 430, are sequentially arranged on the hot bending furnace chamber 200 along the transmission direction of the turntable transmission structure 300. Further, there are four molds 500, each corresponding to one of the feeding and discharging mechanism 440, the preheating mechanism 410, the forming mechanism 420, and the cooling mechanism 430, and these four molds are sequentially arranged on the turntable transmission structure 300 along the transmission direction of the turntable transmission structure 300.

[0083] Please refer to the following: Figure 11 , Figure 14 and Figure 16In some embodiments, the base support 312 is slidably connected to the turntable rigid member 311. Furthermore, the sliding direction of the base support 312 on the turntable rigid member 311 intersects with the horizontal direction. Furthermore, the hot bending furnace chamber 200 is provided with loading and unloading ports 201; the feeding and discharging mechanism 440 includes a hinged gate 441, a loading and unloading frame 442, a gate lifting drive 443, and a push plate 444. The hinged gate 441 is disposed between the preheating mechanism 410 and the cooling mechanism 430, and is connected to the outer wall of the hot bending furnace chamber 200. At least a portion of the hinged gate 441 covers the loading and unloading ports 201. A gas flow port 401 is provided on the hinged gate 441. The gas flow port 401 communicates with the loading and unloading ports 201 when the hinged gate 441 covers the loading and unloading ports 201. The loading and unloading frame 442 is disposed inside the hot bending furnace chamber 200, and the inner wall of the loading and unloading frame 442 surrounds the outer periphery of the loading and unloading ports 201. One end of 42 is connected to the inner wall of the hot bending furnace chamber 200 to form a loading and unloading trough 402. The loading and unloading trough 402 is connected to the loading and unloading port 201. The bottom support 312 is located at the other end of the loading and unloading frame 442. The gate lifting drive 443 is connected to the hot bending furnace chamber 200 or the mounting platform 100. The power output end of the gate lifting drive 443 is at least partially located inside the hot bending furnace chamber 200 and connected to the push plate 444. The gate lifting drive 443 drives the push plate 444 to move towards or away from the bottom support 312. The gate lifting drive 443 drives the push plate 444 to move to the end that abuts against the bottom support 312 and further pushes the push plate 444 to push the bottom support 312 against the loading and unloading frame 442 so that the bottom support 312 is blocked at the opening of the loading and unloading trough 402. Furthermore, a slide rail is provided on the turntable rigid member 311, and the bottom support 312 is slidably connected to the turntable rigid member 311 via the slide rail. Furthermore, the number of gas outlets 401 is two or more, allowing for simultaneous exhaust and inflation through the gas outlets 401. Furthermore, the gate lifting drive member 443 drives the bottom support 312 to move to tightly abut against the end of the loading / unloading frame 442, so that the loading / unloading sealing ring is clamped between the ends of the bottom support 312 and the loading / unloading frame 442, thus achieving tight abutment between the bottom support 312 and the loading / unloading frame 442.

[0084] It is understood that one end of the loading / unloading frame 442 is connected to the inner wall of the hot bending furnace chamber 200 to form the loading / unloading trough 402. The gate lifting drive 443 drives the push plate 444 to move to the end that abuts against the bottom support 312, and further pushes the push plate 444 to push the bottom support 312 against the loading / unloading frame 442, so that the bottom support 312 seals the opening of the loading / unloading trough 402. With at least a portion of the hinged gate 441 covering the loading / unloading port 201, the loading / unloading trough 402 is sealed, and the loading / unloading trough... 402 only needs to be able to accommodate the graphite mold 500, which is conducive to the miniaturization of the gas environment restoration area, thereby reducing processing costs while maintaining the stability of the gas environment; furthermore, after restoring the gas environment of the loading and unloading slots, the gate lifting drive 443 drives the push plate 444 to move away from the loading and unloading frame 442, so that the bottom support 312 can leave the loading and unloading frame 442 together. At this time, the graphite mold 500 can drive the glass blank to perform hot bending treatment in the hot bending furnace cavity.

[0085] Please refer to the following: Figure 11 , Figure 14 and Figure 16In some embodiments, the hinged gate 441 is opened manually or by a gate drive mechanism 445. Further, the hinged gate 441 is provided with a clearance area 403; the gate drive mechanism 445 includes a gate drive component 4451, a first transition adapter 4452, and a second transition adapter 4453. The gate drive component 4451 is disposed on the outer wall of the hot bending furnace chamber 200. The power output end of the gate drive component 4451 is connected to one end of the first transition adapter 4452, and the other end of the first transition adapter 4452 is rotatably connected to one end of the second transition adapter 4453. The other end is rotatably connected to the hinged gate 441. The first transition adapter 4452 and the second transition adapter 4453 are foldable. The second transition adapter 4453 is foldable to the hinged gate 441. Both the first transition adapter 4452 and the second transition adapter 4453 are disposed in a clearance zone 403 to avoid contact with the hinged gate 441. The gate drive 4451 drives the first transition adapter 4452 to move away from or towards the connection between the hinged gate 441 and the hot bending furnace chamber 200. Further, one end of the first transition adapter and one end of the second transition adapter are rotatably connected via a first bearing. Further, one end of the second transition adapter is rotatably connected to the hinged gate via a second bearing. It can be understood that the hinged gate 441 is a gate that opens and closes by using a hinge as a rotation fulcrum. The gate drive 4451 is obliquely mounted on the hinged gate 441. The power output end of the gate drive 4451 is set on the opening and closing track of the hinged gate 441, thereby realizing the opening and closing of the hinged gate 441. This is beneficial to improving the structural compactness of the curved glass hot bending equipment 10. Specifically, the hinged gate 441 and the gate drive 4451 are existing structures, and will not be described in detail in this application.

[0086] Please refer to the following: Figure 2 , Figure 7 and Figure 16In one embodiment, the preheating mechanism 410 includes a first preheating component 411, a second preheating component 412, and a third preheating component 413. The first preheating component 411, the second preheating component 412, the third preheating component 413, the forming mechanism 420, and the cooling mechanism 430 are sequentially arranged on the hot bending furnace chamber 200 along the transmission direction of the turntable transmission structure 300. Further, there are five molds 500, each corresponding to one of the first preheating component 411, the second preheating component 412, the third preheating component 413, the forming mechanism 420, and the cooling mechanism 430, and the five molds 500 are sequentially arranged on the turntable transmission structure 300 along the transmission direction of the turntable transmission structure 300. Furthermore, the forming mechanism 420, the first preheating component 411, the second preheating component 412 and the third preheating component 413 all include a direct heating mechanism 422, which realizes the slow heating of the glass blank in the graphite mold 500 at the corresponding location, thereby ensuring the preparation effect of curved glass.

[0087] Please refer to the following: Figure 2 , Figure 7 and Figure 14 In one embodiment, the cooling mechanism 430 includes a first cooling component 431, a second cooling component 432, and a third cooling component 433. The preheating mechanism 410, the forming mechanism 420, the first cooling component 431, the second cooling component 432, and the third cooling component 433 are sequentially arranged on the hot bending furnace chamber 200 along the transmission direction of the turntable transmission structure 300. Further, there are five molds 500, each corresponding to one of the preheating mechanism 410, the forming mechanism 420, the first cooling component 431, the second cooling component 432, and the third cooling component 433, and the five molds 500 are sequentially arranged on the turntable transmission structure 300 along the transmission direction of the turntable transmission structure 300.

[0088] Please refer to the following: Figure 2 , Figure 7 and Figure 14In some embodiments, the first cooling assembly 431, the second cooling assembly 432, and the third cooling assembly 433 all include a slow cooling mechanism 410a. Further, the slow cooling mechanism 410a includes a slow cooling drive 4111 and a cooling plate 4112. The cooling plate 4112 is located within the hot bending furnace chamber 200. The slow cooling drive 4111 is connected to the hot bending furnace chamber 200 or the mounting platform 100, and the power output end of the slow cooling drive 4111 is at least partially located within the hot bending furnace chamber 200 and connected to the cooling plate 4112. In the direction of gravity, the base 312 and the cooling plate 4112 are arranged linearly in sequence. The slow cooling drive 4111 drives the cooling plate 4112 to move towards or away from the base 312. The cooling plate 4112 is disposed with respect to the turntable rigid member 311. The slow cooling drive 4111 drives the cooling plate 4112 to move towards the base 312 until it abuts against the base 312. It is understandable that the graphite mold 500 is placed on the base 312. In the direction of gravity, the base 312 and the cooling plate 4112 are arranged linearly in sequence. This arrangement allows the slow-cooling drive 4111 to drive the cooling plate 4112 to move closer to the base 312 until it abuts against the base 312. This effectively ensures the suitability of the slow-cooling mechanism 410a for automated processing of glass blanks using a circumferential transmission processing method. Furthermore, it works well with the base 312 to slow down the rapid cooling of the graphite mold 500. This improves the cooling effect of curved glass. In addition, the sliding direction of the base support 312 on the turntable rigid member 311 intersects with the horizontal direction, so that when the cooling plate 4112 is driven by the slow cooling drive member 4111 and comes into contact with the base support 312, the base support 312 can slide relative to the turntable rigid member 311 due to the impact of the cooling plate 4112. This reduces the impact wear of the base support 312, thereby increasing the service life of the base support 312 and reducing the processing cost of curved glass.

[0089] Please refer to the following: Figures 14 to 15 In some embodiments, the cooling plate 4112 is provided with a cooling water pipe 409 and two water flow holes 4010. The two water flow holes 4010 are respectively connected to the two ends of the cooling water pipe 409. The cooling water pipe 409 and the two water flow holes 4010 are both disposed away from the slow cooling drive component 4111. Furthermore, a cooling tower (not shown) is connected to one of its water flow holes 4010, and the cooling tower is connected to a circulating water pump (not shown). The circulating water pump is connected to the other water flow hole 4010, which effectively achieves the cooling plate 4112 to cool the base 312.

[0090] Please refer to the following: Figures 2 to 4 ,as well as Figures 5 to 6In one embodiment, the hot bending structure 400 further includes at least three temperature monitoring mechanisms 450, each corresponding to one of the three molds 500. Each temperature monitoring mechanism 450 penetrates the hot bending furnace chamber 200 and faces the corresponding mold 500. Furthermore, the temperature monitoring mechanism is a photoelectric temperature sensor (hereinafter also referred to as 450 in the accompanying drawings), which effectively ensures real-time monitoring of the temperature of the graphite mold 500 within the hot bending furnace chamber 200, thereby better ensuring the processing effect of the curved glass.

[0091] Please refer to the following: Figure 2 and Figure 7 In one embodiment, the hot bending structure 400 further includes at least one inert gas concentration detector 460, which is disposed in the hot bending furnace chamber 200 to effectively monitor the inert gas concentration in the hot bending furnace chamber 200 in real time, thereby ensuring the processing effect of curved glass.

[0092] Please refer to the following: Figure 2 , Figure 3 and Figure 7 In one embodiment, the hot bending structure 400 further includes an inert gas flow mechanism 470. Further, the inert gas flow mechanism 470 includes an inert gas input pipe 471 and an inert gas output pipe 472, both of which are connected to the hot bending furnace chamber 200. The inert gas input pipe 471 is connected to a gas pump, and the inert gas output pipe 472 is connected to a gas pressure relief valve, effectively maintaining the inert gas concentration within the hot bending furnace chamber 200. Further, the number of inert gas input pipes 471 is the same as the number of photoelectric temperature sensors, with at least one inert gas input pipe 471 corresponding to at least one photoelectric temperature sensor.

[0093] Please refer to the following: Figure 3 , Figure 5 and Figure 6In some embodiments, the inert gas input pipe 471 is a straight pipe, and the extension direction of the inert gas input pipe 471 is the same as the orientation of the graphite mold 500 placed on the base 312. The inert gas input pipe 471 is at least partially located outside the hot bending furnace chamber 200. Any photoelectric temperature sensor 450 is set at the corresponding inert gas input pipe 471 located outside the hot bending furnace chamber 200. The photoelectric temperature sensor 450 is set facing the graphite mold 500 placed on the base 312 inside the hot bending furnace chamber 200. The air pump (not shown) is arranged in a way that avoids the photoelectric temperature sensor 450. It is understood that by placing any photoelectric temperature sensor 450 outside the hot bending furnace chamber 200 and at the corresponding inert gas input pipe 471, the inert gas input at the inert gas input pipe 471 can reduce the temperature of the photoelectric temperature sensor 450 at that location. This ensures that the temperature at the location of the photoelectric temperature sensor 450 is lower than the temperature inside the hot bending furnace chamber 200. Combined with the photoelectric temperature sensor 450 being positioned towards the graphite mold 500 inside the hot bending furnace chamber 200, the photoelectric temperature sensor 450 can effectively monitor the temperature of the graphite mold 500 in real time at a lower temperature. This reduces the impact of the high temperature of the hot bending furnace chamber 200 on the monitoring accuracy of the photoelectric temperature sensor 450. In other words, while ensuring a lower processing cost for curved glass, the accuracy of temperature detection inside the hot bending furnace chamber 200 is improved.

[0094] Please refer to the following: Figure 3 , Figure 5 and Figure 6 In some embodiments, the photoelectric temperature sensor 450 is connected to the inner wall of the inert gas input pipe 471 via a limiting seat 473. The limiting seat 473 has a flow hole 405, which communicates with the inert gas input pipe 471. The flow hole 405 is positioned to avoid obstruction from the photoelectric temperature sensor 450, thereby improving the installation stability of the photoelectric temperature sensor 450 and further reducing the temperature at the photoelectric temperature sensor 450, which in turn further improves the accuracy of temperature detection in the hot bending furnace chamber 200.

[0095] Please refer to the following: Figure 3 , Figure 5 and Figure 6In some embodiments, the limiting seat 473 includes a first seat 4731 and a second seat 4732 stacked together. A flow hole 405 is partially formed on the first seat 4731 and partially formed on the second seat 4732. The first seat 4731 is sleeved on the photoelectric temperature sensor 450, and the outer periphery of the first seat 4731 is connected to the inner wall of the inert gas input pipe 471. A first internal flow hole 404 is also formed on the first seat 4731. A clearance groove 406 and a second internal flow hole 407 are also formed on the second seat 4732. The first seat 4731 covers the clearance groove 406 to form an internal flow cavity 408. The first internal flow hole 404 communicates with the internal flow cavity 408, and the second internal flow hole 407 communicates with the internal flow cavity 408. The lens of the photoelectric temperature sensor 450 is located at the internal flow cavity 408 or the second internal flow hole 407. Furthermore, the first housing is tightly laminated and connected to the second housing via a sealing ring or adhesive layer. It can be understood that the arrangement of the first internal flow hole 404 and the second internal flow hole 407 further ensures better contact between the input inert gas and the surface of the photoelectric temperature sensor 450, thereby achieving a better and more effective reduction in temperature at the photoelectric temperature sensor 450.

[0096] Please refer to the following: Figure 3 , Figure 5 and Figure 6 In some embodiments, the lens of the photoelectric temperature sensor 450 is located at the second internal flow hole 407, and the aperture of the second internal flow hole 407 gradually decreases in the direction from the end of the second internal flow hole 407 to the position near the lens. This facilitates the cleaning of the lens of the photoelectric temperature sensor 450 by the input inert gas, thereby improving the accuracy of the photoelectric temperature sensor 450 in real-time monitoring of the surface temperature of the mold 500.

[0097] Please see Figure 14 In one embodiment, the hot bending furnace chamber 200 is provided with a heat insulation layer 210. The heat insulation layer 210 is connected to the inner wall of the hot bending furnace chamber 200 to form a heat insulation zone 202. The heat insulation layer 210 is respectively provided with the preheating mechanism 410 and the forming mechanism 420. The mold 500, which is provided with the preheating mechanism 410 and the forming mechanism 420, is located at the heat insulation zone 202. This improves the heat insulation effect at the preheating mechanism 410 and the forming mechanism 420 and reduces the heat transfer from the temperature at the preheating mechanism 410 and the forming mechanism 420 to the overall temperature of the hot bending equipment 10 for curved glass, thereby improving the operational stability of the hot bending equipment 10 for curved glass.

[0098] Please refer to the following: Figure 8 , Figure 11 and Figure 16In one embodiment, the hot bending furnace chamber 200 has at least one window 203, and a sealing body 220 is provided over the window 203. The sealing body 220 is detachably and tightly connected to the hot bending furnace chamber 200. It should be noted that the detachable and tight connection between the sealing body 220 and the hot bending furnace chamber 200 can be understood as follows: the sealing body 220 is detachably connected to the hot bending furnace chamber 200, and when the sealing body 220 is connected to the hot bending furnace chamber 200, the sealing element is tightly connected to the hot bending furnace chamber 200 so that the sealing element blocks the window 203 of the furnace body, thereby making the hot bending furnace chamber 200 a relatively sealed chamber, which is beneficial for convenient maintenance of the various components inside the hot bending furnace chamber 200.

[0099] Compared with the prior art, the present invention has at least the following advantages:

[0100] The hot bending process for curved glass of this invention uses a graphite mold to form a negative pressure cavity on a flat glass blank, so that the periphery of the flat glass blank abuts against the periphery of the mold. This creates a negative pressure cavity with a certain sealing effect on the flat glass blank placed on the graphite mold. The flat glass blank is then preheated to ensure sufficient heating. The graphite mold, with a porosity of 10%-20% and a pore size of 0.6µm-0.9µm, provides a strong adsorption force between the graphite mold and the flat glass blank. This allows bending to occur under the strong adsorption force of the graphite mold near the flat glass blank after further heating. Finally, the preheated negative pressure cavity is subjected to a vacuum hot bending process, further enhancing the adhesion between the graphite mold and the flat glass blank. It possesses high adsorption strength, which, combined with the preheating treatment of the flat glass blank after the negative pressure chamber is formed, allows for simultaneous adsorption and bending deformation under further heating of the flat glass blank. This enables the flat glass blank to effectively bend and deform and adhere to the surface of the graphite mold, thus ensuring that the graphite mold can effectively adsorb and bend the flat glass blank while effectively reducing the processing difficulty of curved glass, even when using a general hot-pressing bending process for flat glass blanks. In addition, the pores of the graphite mold are obtained by graphite compaction. The compaction density determines the porosity and pore size of the graphite mold. Its pores are mostly curved, i.e., non-linear, so that the negative pressure formed at the pores generates more component forces that have a multi-angle attraction effect on the curved glass, making the attraction force on the curved glass more even and thus improving the surface flatness of the curved glass.

[0101] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A hot bending process for curved glass, characterized in that, Includes the following steps: Obtain a flat glass blank; A graphite mold is used to form a negative pressure cavity on the flat glass blank, so that the periphery of the flat glass blank abuts against the periphery of the mold to form a negative pressure cavity. The graphite mold is porous with a porosity of 10%-20% and a pore size of 0.6um-0.9um. The planar glass blank after the negative pressure cavity formation process is preheated. The preheated negative pressure cavity is subjected to vacuum hot bending treatment to create a negative pressure in the negative pressure cavity; The flat glass blank after vacuum hot bending is subjected to thermoforming to obtain curved glass. Before the step of preheating the flat glass blank after the negative pressure cavity formation process, and after the step of forming the negative pressure cavity in the flat glass blank using a graphite mold, the hot bending process of the curved glass further includes the following steps: The graphite mold is subjected to circumferential transfer processing so that the graphite mold is connected to the planar glass blank and is sequentially transferred along the circumference to perform preheating treatment and thermoforming operations. The turntable transmission structure includes a return plate and a drive roller, with the return plate sleeved on the drive roller. The hot bending furnace chamber is mounted on a mounting platform. The drive roller is rotatably connected to the hot bending furnace chamber, and at least a portion of the drive roller protrudes from the hot bending furnace chamber and is used to connect to the power output end of the turntable drive component. The turntable drive component is connected to the hot bending furnace chamber or the mounting platform. At least three molds are sequentially arranged on the return plate along the rotation direction of the return plate. Any mold is located on the outer periphery of the drive roller so that the return plate is sleeved on the drive roller. The drive roller is connected to the power output end of the turntable drive component. The turntable drive component drives the drive roller to rotate and makes the return plate rotate circumferentially. The glass blank passes through the preheating mechanism, the forming mechanism, and the cooling mechanism sequentially on the mold along with the return plate for hot bending processing. The return plate includes a turntable rigid component and at least three base supports. The turntable rigid component is sleeved on the drive roller. At least three through areas are opened on the turntable rigid component. The at least three through areas are arranged sequentially at intervals along the rotation direction of the turntable rigid component. At least three base supports are correspondingly set at the at least three through areas, and each base support is connected to the turntable rigid component. At least three molds are correspondingly placed on the at least three base supports. The base is slidably connected to the rigid component of the turntable, and the sliding direction of the base on the rigid component of the turntable intersects with the horizontal direction; The hot bending furnace chamber is equipped with inlet and outlet ports; The feeding and discharging mechanism includes a hinged gate, loading and unloading frames, a gate lifting drive, and a push plate. The hinged gate is positioned between the preheating and cooling mechanisms and is connected to the outer wall of the hot bending furnace chamber. At least a portion of the hinged gate covers the loading and unloading ports. A gas flow port is provided on the hinged gate, communicating with the loading and unloading ports when the gate covers them. The loading and unloading frames are located within the hot bending furnace chamber, with their inner walls surrounding the outer perimeter of the loading and unloading ports. One end of the loading and unloading frames is connected to the hot bending furnace chamber. The inner wall is connected to form the upper and lower material troughs, which are connected to the upper and lower material inlets. The bottom support is located at the other end of the upper and lower material frame. The gate lifting drive is connected to the hot bending furnace chamber or the mounting platform. The power output end of the gate lifting drive is at least partially located inside the hot bending furnace chamber and connected to the push plate. The gate lifting drive drives the push plate to move towards or away from the bottom support. The gate lifting drive drives the push plate to move to the end that abuts against the bottom support and further pushes the push plate to push the bottom support against the upper and lower material frame so that the bottom support is sealed at the opening of the upper and lower material troughs.

2. The hot bending process for curved glass according to claim 1, characterized in that, The planar glass blank, after the negative pressure chamber is formed, is preheated to continuously raise its temperature to near the deformation point temperature.

3. The hot bending process for curved glass according to claim 2, characterized in that, The deformation point temperature is 650℃-800℃.

4. The hot bending process for curved glass according to claim 1, characterized in that, The flat glass blank, after vacuum hot bending, is subjected to thermoforming treatment so that the temperature of the flat glass blank continues to rise to near the softening point temperature.

5. The hot bending process for curved glass according to claim 4, characterized in that, The softening point temperature is 800℃-1000℃.

6. The hot bending process for curved glass according to claim 1, characterized in that, A forming groove is provided on one side of the mold. The flat glass blank is placed in the forming groove. When the flat glass blank is placed in the forming groove, the flat glass blank covers the forming groove to form a negative pressure cavity, and the periphery of the flat glass blank is located on the outer periphery of the forming groove and abuts against the graphite mold.

7. The hot bending process for curved glass according to claim 1, characterized in that, After the step of thermoforming the flat glass blank after vacuum hot bending, the hot bending process of the curved glass also includes the following steps: The curved glass is then cooled.

8. The hot bending process for curved glass according to claim 7, characterized in that, The curved glass is cooled, specifically as follows: The curved glass is subjected to staged cooling, so that the curved glass is cooled down three times in succession for equal duration.

9. The hot bending process for curved glass according to claim 1, characterized in that, The preheating treatment of the planar glass blank after the negative pressure cavity formation process is specifically as follows: the planar glass blank is preheated in stages so that the planar glass blank is preheated for three consecutive times of equal duration.

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