Production device and process of 3D double-curved glass cover plate

Abstract

This invention relates to the field of glass processing technology, and in particular to a production apparatus and process for 3D hyperboloid glass covers, which solves the problem of poor finished product quality of 3D hyperboloid glass covers formed by traditional molds. The apparatus includes a protective mechanism, which includes a pressure cylinder. A forming mechanism is installed inside the pressure cylinder. The forming mechanism includes a lower mold. A sealing frame is vertically slidably connected to the upper part of the lower mold. A rectangular frame is fixedly connected to the bottom wall of the pressure cylinder on the outer side of the lower mold. The glass cover to be formed is placed in the lower mold. When the glass cover to be formed is heated and high-pressure inert gas is introduced into the pressure cylinder, the gas pressure acts on the glass cover to be formed, causing the glass cover to deform and adhere to the lower mold. The process includes atmosphere replacement, heating, pressurization, annealing, and material removal. This invention uses gas pressure to drive the glass cover to adhere to the lower mold, avoiding poor quality in the later forming process.

Description

Technical Field

[0001] This invention relates to the field of glass processing technology, specifically to a production apparatus and process for 3D hyperboloid glass covers. Background Technology

[0002] With the pursuit of ultimate industrial design aesthetics and human-computer interaction in modern consumer electronics products, especially high-end smartphones, wearable devices, and automotive display systems, three-dimensional (3D) curved glass has evolved from a luxury item to a mainstream feature. Its seamless edge transitions, comfortable grip, and expansive visual extension greatly enhance the overall value of the product. Currently, the core manufacturing process widely used in the industry is traditional hot bending technology. This process typically involves placing a precisely cut and edge-treated flat glass substrate (such as aluminosilicate glass) between a pair of precision-machined rigid metal or graphite molds (including an upper and lower mold) with the desired curved surface shape. Subsequently, the molds and glass components are heated in a hot bending furnace to the glass's softening temperature (usually higher than its transition temperature Tg). A servo motor or cylinder drives the upper mold downwards, forcing the high-temperature softened glass to yield and conform to the shape of the mold cavity through mechanical force.

[0003] However, this traditional technology, which relies on direct contact with a rigid mold, suffers from a series of inherent defects rooted in its physical principles that are difficult to eradicate. Firstly, there is the problem of optical surface damage. Glass, in its high-temperature viscoplastic state, has an extremely fragile surface; any minute contact stress can lead to permanent defects. The rigid upper mold and the final optical surface of the glass presented to the user undergo comprehensive, high-pressure physical contact. This inevitably replicates the mold's own microscopic texture on the glass surface, producing so-called "orange peel" texture, or causing scratches, pitting, and imprints due to minute defects or contaminants on the mold surface. To eliminate these defects, complex and costly multi-pass chemical or mechanical polishing processes must be added. However, the polishing process itself may introduce new subsurface damage or affect surface accuracy, resulting in a significant reduction in the final yield. Secondly, there is stress concentration and poor thickness uniformity. Mechanical pressurization is essentially a non-uniform force transmission process. Especially when dealing with complex curved surfaces with abrupt curvature changes (such as quad-curved surfaces and the radius of curvature of waterfall screens), stress easily concentrates in specific areas. This not only leads to uneven and harmful residual stress within the glass, affecting the product's mechanical strength and impact resistance, but also causes excessive material flow in localized areas, resulting in thinner walls. This poses a serious challenge to the performance consistency of under-display sensing technologies (such as fingerprint sensors and cameras). Thirdly, design freedom is limited. For some extremely complex or free-form curved surface designs, manufacturing a matching rigid upper mold that can maintain high precision at high temperatures is extremely difficult and expensive, and the demolding process is also more complex. This, to some extent, limits the innovative space of product designers. These fundamental defects constitute the core technological bottlenecks currently faced by the 3D glass manufacturing field in improving optical quality, mechanical performance, and production economics. Summary of the Invention

[0004] This invention provides a production apparatus and process for 3D hyperboloid glass covers to solve the problem of poor finished product quality of 3D hyperboloid glass covers produced by traditional mold forming.

[0005] To alleviate the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0006] A production apparatus for 3D hyperboloid glass cover plates includes a protective mechanism, which includes a pressure cylinder. A forming mechanism is installed inside the pressure cylinder. The forming mechanism includes a lower mold. A sealing frame is vertically slidably connected to the upper part of the lower mold. A rectangular frame is fixedly connected to the bottom wall of the pressure cylinder on the outer side of the lower mold. The glass cover plate to be formed is placed on the lower mold. After the sealing frame moves down, it can contact the upper surface of the glass cover plate to be formed. At this time, the outer wall of the sealing frame is in contact with the inner wall of the rectangular frame, so that the internal space of the rectangular frame is independent of the pressure cylinder. When the glass cover plate to be formed is heated and high-pressure inert gas is introduced into the pressure cylinder, the gas pressure acts on the glass cover plate to be formed, causing the glass cover plate to be formed to deform and fit into the lower mold.

[0007] Furthermore, the bottom wall of the pressure cylinder is connected to an exhaust pipe that communicates with the internal space of the rectangular frame, and a one-way valve is provided on the exhaust pipe.

[0008] Furthermore, the portion of the exhaust pipe located between the one-way valve and the port is connected to an extraction pipe, which is connected to an external vacuum pump.

[0009] Furthermore, it also includes a lifting control mechanism, which includes four control cylinders fixedly connected to the bottom wall of the pressure cylinder. Each of the four corners of the sealing frame is fixedly connected to a sliding rod, and the four sliding rods are respectively slidably inserted into the four control cylinders. Each of the four control cylinders is provided with a pressure valve at its bottom. When the molded glass cover plate is heated and deformed, the sealing frame moves downward under gravity, and at the same time, the air in the control cylinder is discharged through the pressure valve.

[0010] Furthermore, the sealing frame is provided with multiple annular sealing strips at the contact points with the glass cover plate to be formed.

[0011] Furthermore, a first gas pipe is connected to all four control cylinders, and a second gas pipe is connected to the first gas pipe. The second gas pipe is connected to an external vacuum pump. Gas detectors are installed at the outlet ends of the exhaust pipe and the suction pipe. When the gas detector detects a leak of inert gas inside the pressure cylinder, the external vacuum pump connected to the second gas pipe runs, thereby driving the sealing frame to fit into the glass cover plate to be formed.

[0012] Furthermore, a pressure stabilizing pipe is connected to the second air pipe, and a first pressure valve is provided on the pressure stabilizing pipe. After the negative pressure intensity transmitted from the first air pipe to the control cylinder increases, the first pressure valve opens, thereby reducing the negative pressure intensity in the control cylinder, and thus reducing the pressure applied by the sealing frame to the glass cover plate to be formed.

[0013] Furthermore, a slider is fixedly connected to the lower surface of the lower mold, and a box is fixedly connected to the bottom wall of the pressure cylinder. The slider slides inside the box, and the side wall of the slider is in contact with the inner wall of the box. When the air pressure inside the box increases or decreases, the slider can slide vertically inside the box, so that the lower mold can rise or fall to be in a forming state or a material taking state.

[0014] Furthermore, a third air pipe is connected to the first air pipe, the third air pipe is connected to the box body, and a second pressure valve is provided on the third air pipe; The bottom wall of the box is connected to a discharge pipe, and a solenoid valve is installed on the discharge pipe.

[0015] A manufacturing process for 3D hyperboloid glass covers, using a 3D hyperboloid glass cover manufacturing apparatus, includes the following steps: Raise the sealing frame and place the glass cover to be formed on the lower mold. Control the pressure cylinder to be in a sealed state. The glass cover to be formed is a special lithium aluminum silicate glass with a size of 170mm x 80mm and an original thickness of 0.8mm. Evacuate the pressure cylinder to 5 Pa, then fill the pressure cylinder with high-purity nitrogen gas, and repeat the cycle three times until the oxygen content analyzer reading in the pressure cylinder is 3 ppm. The glass was heated from 250°C to 885°C at an average rate of 30°C / min. After reaching 885°C, it was isothermally wetted for 150 seconds to ensure that the glass reached thermal equilibrium and uniform viscosity. After the homogenization is complete, inert gas is introduced into the pressure cylinder. When the inert gas is introduced, the pressure inside the pressure cylinder changes as follows: for the first 30 seconds, it slowly rises from 0.1MPa to 1.0MPa; for the next 40 seconds, it rapidly and linearly rises from 1.0MPa to 3.8MPa; and for the last 20 seconds, it gradually reaches the peak pressure of 4.0MPa. At the peak pressure, the system holds the pressure for 240 seconds to ensure that the glass fully creeps and perfectly conforms to the complex isochronous curved surface contour of the mold. After molding, the process enters the online annealing stage. While maintaining a pressure of 4.0 MPa inside the pressure cylinder, the temperature is cooled from 885℃ to 600℃ at a rate of 1.5℃ / min. After reaching 600℃, the cooling rate is accelerated to 10℃ / min, and at the same time, the pressure inside the pressure cylinder begins to decrease steadily at a rate of 0.2 MPa / min. After the temperature inside the pressure cylinder drops to 150°C and the internal pressure drops to atmospheric pressure, the formed glass cover is removed.

[0016] The beneficial effects of this invention are analyzed as follows: A production apparatus for 3D hyperboloid glass cover plates includes a protective mechanism, which includes a pressure cylinder. A forming mechanism is installed inside the pressure cylinder. The forming mechanism includes a lower mold. A sealing frame is vertically slidably connected to the upper part of the lower mold. A rectangular frame is fixedly connected to the bottom wall of the pressure cylinder on the outer side of the lower mold. The glass cover plate to be formed is placed on the lower mold. After the sealing frame moves down, it can contact the upper surface of the glass cover plate to be formed. At this time, the outer wall of the sealing frame is in contact with the inner wall of the rectangular frame, so that the internal space of the rectangular frame is independent of the pressure cylinder. When the glass cover plate to be formed is heated and high-pressure inert gas is introduced into the pressure cylinder, the gas pressure acts on the glass cover plate to be formed, causing the glass cover plate to be formed to deform and fit into the lower mold.

[0017] After the glass cover to be formed is heated, the inside of the pressure cylinder is pressurized. At this time, the sealing frame is in contact with both the rectangular frame and the glass cover to be formed. Thus, the internal space of the rectangular frame is independent of the pressure cylinder. As the pressure inside the pressure cylinder increases, the air pressure acts on the glass cover to be formed, allowing it to fit against the lower mold, thereby completing the forming of the glass cover. At the same time, because the air pressure inside the rectangular frame is lower than the air pressure inside the pressure cylinder, the sealing frame can move downwards when the pressure inside the pressure cylinder increases. This ensures that the air pressure is evenly applied to the glass cover to be formed, preventing a large amount of gas from entering between the glass cover and the lower mold, ensuring a good fit between the glass cover and the lower mold, and thus improving the quality of the forming process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the sealing cone structure of the present invention; Figure 4 This is a schematic diagram of the structure of the annular sealing strip of the present invention; Figure 5 This is a schematic diagram of the structure of the control cylinder of the present invention; Figure 6 This is a schematic diagram of the structure at the cone tip of the present invention; Figure 7 This is a schematic diagram of the structure of the housing of the present invention; Figure 8 This is a schematic diagram of the gripping mechanism of the present invention.

[0019] In the diagram: 100, protective mechanism; 110, pressure cylinder; 120, cylinder cover; 130, support leg; 200, forming mechanism; 210, rectangular frame; 211, exhaust pipe; 212, one-way valve; 213, extraction pipe; 220, lower mold; 230, sealing frame; 231, annular sealing strip; 232, sealing cone; 240, slide bar; 241, retaining ring; 300, lifting control mechanism; 310, control... Cylinder; 320, Support; 330, Cone; 340, Spring; 350, First air pipe; 360, Second air pipe; 361, First pressure valve; 362, Pressure stabilizing pipe; 370, Third air pipe; 371, Second pressure valve; 380, Discharge pipe; 381, Solenoid valve; 390, Housing; 391, Slider; 400, Gripping mechanism; 410, Channel; 420, Robotic arm; 430, Baffle. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Examples, such as Figures 1-8 As shown, a production apparatus for a 3D hyperboloid glass cover includes a protective mechanism 100, which includes a pressure cylinder 110. A forming mechanism 200 is installed inside the pressure cylinder 110. The forming mechanism 200 includes a lower mold 220. A sealing frame 230 is vertically slidably connected to the upper part of the lower mold 220. A rectangular frame 210 is fixedly connected to the bottom wall of the pressure cylinder 110 on the outer side of the lower mold 220. When the glass cover to be formed is placed in the lower mold 220, the sealing frame 230 moves down and can contact the upper surface of the glass cover to be formed. At this time, the outer wall of the sealing frame 230 is in contact with the inner wall of the rectangular frame 210, so that the internal space of the rectangular frame 210 is independent of the pressure cylinder 110. When the glass cover to be formed is heated and high-pressure inert gas is introduced into the pressure cylinder 110, the gas pressure acts on the glass cover to be formed, causing the glass cover to be formed to deform and fit into the lower mold 220.

[0022] Working mechanism of the 3D hyperboloid glass cover production device provided in this embodiment: The pressure cylinder 110 is equipped with a cylinder cover 120. By opening the cylinder cover 120, the internal components of the pressure cylinder 110 can be maintained and repaired, or the glass cover to be formed can be placed on the lower mold 220. The lower mold 220 is preheated in advance. After the glass cover to be formed is placed, the cylinder cover 120 is closed to seal the inside of the pressure cylinder 110. The pressure cylinder 110 is then evacuated and high-purity nitrogen is injected. This cycle is repeated three times until the oxygen content inside the pressure cylinder 110 reaches the required level. An infrared heating lamp is installed inside the pressure cylinder 110. The infrared heating lamp can be installed on the retaining ring 241. The glass cover to be formed is heated by the infrared heating lamp to achieve thermal equilibrium and uniform viscosity. After heating, the pressure cylinder 110 is pressurized. At this time, the sealing frame 230 is in contact with both the rectangular frame 210 and the glass cover to be formed. Thus, the internal space of the rectangular frame 210 is independent of the pressure cylinder 110. When the pressure inside the pressure cylinder 110 increases, the air pressure acts on the glass cover to be formed, allowing the glass cover to be formed to fit against the lower mold 220, thereby completing the forming of the glass cover. At the same time, since the air pressure inside the rectangular frame 210 is lower than the air pressure inside the pressure cylinder 110, the sealing frame 230 can move downwards when the pressure inside the pressure cylinder 110 increases. This ensures that the air pressure can be evenly applied to the glass cover to be formed, preventing a large amount of gas from entering between the glass cover to be formed and the lower mold 220, ensuring the fit between the glass cover to be formed and the lower mold 220, and thus improving the quality of the forming. The lower mold 220 is made of materials selected according to molding requirements. It can be fine-particle isostatic graphite coated with a dense chemical vapor deposition (CVD) silicon carbide (SiC) or boron nitride (BN) coating, or it can be made entirely of sintered silicon nitride (Si3N4) ceramic. The surface of the lower mold 220 is subjected to optical-grade grinding and polishing.

[0023] Among the optional methods in this embodiment, the more preferred one is: The bottom wall of the pressure cylinder 110 is connected to an exhaust pipe 211 that communicates with the internal space of the rectangular frame 210, and a one-way valve 212 is provided on the exhaust pipe 211.

[0024] The exhaust pipe 211 connects to the internal space of the rectangular frame 210. When the sealing frame 230 moves down, the air inside the rectangular frame 210 is discharged through the exhaust pipe 211. The one-way valve 212 on the exhaust pipe 211 prevents external air from flowing back into the internal space of the rectangular frame 210. A sealing cone 232 is also provided on the lower surface of the sealing frame 230. The sealing cone 232 and the sealing frame 230 can be connected by threads, so that the distance between the sealing cone 232 and the sealing frame 230 can be adjusted. When the sealing frame 230 moves down until the sealing cone 232 is inserted into the exhaust pipe 211, the gas in the rectangular frame 210 will no longer be discharged, and the sealing frame 230 will stop moving down. By adjusting the downward stroke of the sealing frame 230, the glass cover to be formed can be made with different curvatures.

[0025] Among the optional methods in this embodiment, the more preferred one is: The portion of the exhaust pipe 211 located between the one-way valve 212 and the port is connected to an extraction pipe 213, which is connected to an external vacuum pump.

[0026] When the vacuum pump outside the evacuation pipe 213 is running, the gas inside the rectangular frame 210 can be actively discharged, thereby changing the pressure applied by the sealing frame 230 to the glass cover to be formed. At the same time, controlling the active downward movement of the sealing frame 230 also improves the fit between the sealing frame 230 and the glass cover to be formed, ensuring the independence of the internal space of the rectangular frame 210.

[0027] Among the optional methods in this embodiment, the more preferred one is: It also includes a lifting control mechanism 300, which includes four control cylinders 310 fixedly connected to the bottom wall of the pressure cylinder 110. Each of the four corners of the sealing frame 230 is fixedly connected to a slide rod 240. The four slide rods 240 are slidably inserted into the four control cylinders 310 respectively. Each of the four control cylinders 310 is equipped with a pressure valve at the bottom. When the molded glass cover is heated and deformed, the sealing frame 230 moves downward under gravity, and at the same time, the air in the control cylinder 310 is discharged through the pressure valve.

[0028] The control cylinder 310 guides the sliding direction of the slide bar 240, enabling the sealing frame 230 to move vertically. The air pressure inside the control cylinder 310 supports the sealing frame 230, ensuring that the pressure exerted by the sealing frame 230 on the glass cover plate to be formed is not excessive, thus preventing the glass cover plate to be formed from deforming due to the pressure of the sealing frame 230. When the air pressure causes the glass cover plate to be formed to gradually fit into the lower mold 220, the gravity of the sealing frame 230 acts on the air inside the control cylinder 310, causing the air pressure valve at the bottom of the control cylinder 310 to open and release the air. This allows the sealing frame 230 to move downward, ensuring that the sealing frame 230 can still fit into the glass cover plate during the forming process even when the glass cover plate to be formed deforms. The air pressure valve consists of a bracket 320, a cone 330, and a spring 340. The bracket 320 is fixedly connected to the bottom outer wall of the control cylinder 310. The cone 330 is inserted into the bottom of the control cylinder 310. The spring 340 applies a pushing force to the cone 330, causing the cone 330 to block the bottom port of the control cylinder 310. When the glass cover to be formed deforms, the sealing frame 230 moves downward under gravity, which increases the air pressure in the control cylinder 310 and pushes the cone 330 downward, thereby allowing the gas in the control cylinder 310 to be discharged. At this time, the height of the sealing frame 230 decreases. The pressure cylinder 110 is equipped with a support foot 130 at the bottom, which creates a gap between the air pressure valve and the ground, ensuring that the movement of the cone head 330 is not obstructed.

[0029] Among the optional methods in this embodiment, the more preferred one is: Multiple annular sealing strips 231 are provided on the contact part of the sealing frame 230 with the glass cover plate to be formed.

[0030] The annular sealing strip 231 can be a high-purity graphite fiber felt or a ceramic fiber braided rope. The annular sealing strip 231 enables the sealing frame 230 to form an airtight isolation between the edge of the glass cover to be formed and the rectangular frame 210 in the initial state, ensuring that a pressure difference can occur on both sides of the glass cover to be formed, and ensuring that the glass cover to be formed can be formed subsequently.

[0031] Among the optional methods in this embodiment, the more preferred one is: The four control cylinders 310 are connected by a first air pipe 350, and a second air pipe 360 ​​is connected to the first air pipe 350. The second air pipe 360 ​​is connected to an external vacuum pump. Gas detectors are installed at the outlet ends of the exhaust pipe 211 and the suction pipe 213. When the gas detector detects a leak of inert gas inside the pressure cylinder 110, the external vacuum pump connected to the second air pipe 360 ​​runs, thereby driving the sealing frame 230 to fit into the glass cover to be formed.

[0032] When the gas detector detects a leak of inert gas inside the pressure cylinder 110, it indicates that there is a gap between the sealing frame 230 and the glass cover to be formed. In other words, the internal space of the rectangular frame 210 is connected to the internal space of the pressure cylinder 110. At this time, the external vacuum pump connected to the second gas pipe 360 ​​is activated, causing the gas in the control cylinder 310 to be extracted through the first gas pipe 350 and the second gas pipe 360. As a result, the sealing frame 230 can continue to move downward, improving the fit between the sealing frame 230 and the glass cover to be formed. This allows the pressure difference between the two sides of the incompletely formed glass cover to be maintained, ensuring the continuation of subsequent forming.

[0033] Among the optional methods in this embodiment, the more preferred one is: The second air pipe 360 ​​is connected to a pressure stabilizing pipe 362, and a first pressure valve 361 is provided on the pressure stabilizing pipe 362. After the negative pressure intensity transmitted from the first air pipe 350 to the control cylinder 310 increases, the first pressure valve 361 opens, thereby reducing the negative pressure intensity in the control cylinder 310, and thus reducing the pressure applied by the sealing frame 230 to the glass cover plate to be formed.

[0034] To prevent the sealing frame 230 from applying excessive pressure to the glass cover plate to be formed when it moves downward, a pressure stabilizing pipe 362 is connected to the second air pipe 360. A first pressure valve 361 is installed on the pressure stabilizing pipe 362. When the negative pressure inside the control cylinder 310 is higher than required, external air breaks through the restriction of the first pressure valve 361 and enters the second air pipe 360, thereby ensuring that the sealing frame 230 does not apply excessive pressure to the glass cover plate to be formed. The first pressure valve 361 is a one-way flow type, ensuring that external gas can only enter the second air pipe 360 ​​through the pressure stabilizing pipe 362.

[0035] Among the optional methods in this embodiment, the more preferred one is: A slider 391 is fixedly connected to the lower surface of the lower mold 220, and a box 390 is fixedly connected to the bottom wall of the pressure cylinder 110. The slider 391 slides inside the box 390, and the side wall of the slider 391 is in contact with the inner wall of the box 390. When the air pressure inside the box 390 increases or decreases, the slider 391 can slide vertically inside the box 390, so that the lower mold 220 can rise or fall to be in the forming state or the material taking state.

[0036] When gas is injected into the housing 390, the slider 391 can move upward, and the lower mold 220 moves upward synchronously. When the gas in the housing 390 is discharged, the lower mold 220 can move downward. The up and down movement of the lower mold 220 allows it to be in the forming state and the material taking state.

[0037] Among the optional methods in this embodiment, the more preferred one is: The first air pipe 350 is connected to the third air pipe 370, which is connected to the box body 390, and a second pressure valve 371 is installed on the third air pipe 370; the bottom wall of the box body 390 is connected to the discharge pipe 380, and a solenoid valve 381 is installed on the discharge pipe 380.

[0038] A gripping mechanism 400 is provided on the pressure cylinder 110. The gripping mechanism 400 includes a channel 410 connected to the side wall of the pressure cylinder 110. The channel 410 is a rectangular cylinder. A robot arm 420 is provided inside the channel 410. A baffle 430 is vertically slidably connected to the channel 410. The baffle 430 moves vertically inside the channel 410. The baffle 430 is electrically controlled. By controlling the vertical movement of the baffle 430, the channel 410 can be opened or closed. When the channel 410 is opened, the robot arm 420 can extend into the pressure cylinder 110 to place the glass cover to be formed or to remove the formed glass cover. When the glass cover is being placed or removed, the external vacuum pump connected to the second air pipe 360 ​​is reversed, so that gas enters the control cylinder 310 through the second air pipe 360 ​​and the first air pipe 350. During this process, an object can be manually inserted or inserted between the bracket 320 and the cone 330 to restrict the sliding of the cone 330, so that the bottom of the control cylinder 310 is closed. At this time, the slide rod 240 moves upward relative to the control cylinder 310, and the sealing frame 230 moves upward. When the slide rod 240 moves upward to abut the retaining ring 241, the upward movement of the slide rod 240 is blocked. After the sealing frame 230 moves upward, the sealing frame 230 can detach from the contact of the formed glass cover. At this time, the space inside the rectangular frame 210 is connected to the space inside the pressure cylinder 110, so that no negative pressure resistance is generated to block the upward movement of the sealing frame 230. After the slide bar 240 abuts against the retaining ring 241, the air pressure in the third air pipe 370 gradually increases until the air pressure reaches the threshold of the second pressure valve 371. Then the gas enters the box 390, causing the lower mold 220 to rise. After the lower mold 220 rises to its maximum height, the baffle 430 opens, and the robot arm 420 takes out the formed glass cover plate. Then, the robot arm 420 grabs the glass cover plate to be formed and places it on the lower mold 220. After placement, the baffle 430 moves down to close the channel 410, and then the solenoid valve 381 opens, allowing the air in the housing 390 to be discharged through the exhaust pipe 380. At this time, the lower mold 220 moves down and is in the forming state. Then the limit on the cone 330 is released, allowing the air in the control cylinder 310 to be discharged, so that the slide rod 240 can move down relative to the control cylinder 310, causing the sealing frame 230 to move down and fit against the edge of the surface of the glass cover to be formed. Then the forming operation of the glass cover to be formed is performed. By setting up channel 410 to pick up and put in the glass plate inside pressure cylinder 110, it is ensured that a large amount of air will not enter pressure cylinder 110 when the glass cover is picked up or put in, thereby reducing the consumption of high-purity nitrogen gas for atmosphere replacement inside pressure cylinder 110 in the later stage.

[0039] A manufacturing process for 3D hyperboloid glass covers, using a 3D hyperboloid glass cover manufacturing apparatus, includes the following steps: Lift the sealing frame 230, place the glass cover to be formed on the lower mold 220, and control the pressure cylinder 110 to be in a sealed state. The glass cover to be formed is a special lithium aluminum silicate glass with a size of 170mm x 80mm and an original thickness of 0.8mm. Evacuate pressure cylinder 110 to 5 Pa, then fill pressure cylinder 110 with high-purity nitrogen gas, and cycle three times until the oxygen content analyzer reading in pressure cylinder 110 is 3 ppm. The glass was heated from 250°C to 885°C at an average rate of 30°C / min. After reaching 885°C, it was isothermally wetted for 150 seconds to ensure that the glass reached thermal equilibrium and uniform viscosity. After the homogenization is complete, inert gas is introduced into the pressure cylinder 110. When the inert gas is introduced, the pressure inside the pressure cylinder 110 changes as follows: for the first 30 seconds, it slowly rises from 0.1MPa to 1.0MPa; for the middle 40 seconds, it rapidly and linearly rises from 1.0MPa to 3.8MPa; and for the last 20 seconds, it gradually reaches the peak pressure of 4.0MPa. At the peak pressure, the system holds the pressure for 240 seconds to ensure that the glass fully creeps and perfectly conforms to the complex isochronous curved surface contour of the mold. After molding, the process enters the online annealing stage. While maintaining a pressure of 4.0 MPa inside the pressure cylinder 110, the temperature is cooled from 885℃ to 600℃ at a rate of 1.5℃ / min. After reaching 600℃, the cooling rate is accelerated to 10℃ / min, and at the same time, the pressure inside the pressure cylinder 110 begins to decrease steadily at a rate of 0.2 MPa / min. After the internal temperature of the pressure cylinder 110 drops to 150°C and the internal pressure drops to atmospheric pressure, the formed glass cover is removed.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A production apparatus for 3D hyperboloid glass covers, characterized in that: The system includes a protective mechanism (100), which includes a pressure cylinder (110). A forming mechanism (200) is installed inside the pressure cylinder (110). The forming mechanism (200) includes a lower mold (220). A sealing frame (230) is vertically slidably connected to the upper part of the lower mold (220). A rectangular frame (210) is fixedly connected to the bottom wall of the pressure cylinder (110) on the outer side of the lower mold (220). The glass cover to be formed is placed in the lower mold (220). After the sealing frame (230) moves down, it can contact the upper surface of the glass cover to be formed. At this time, the outer wall of the sealing frame (230) is in contact with the inner wall of the rectangular frame (210), so that the internal space of the rectangular frame (210) is independent of the pressure cylinder (110). When the glass cover to be formed is heated and high pressure inert gas is introduced into the pressure cylinder (110), the gas pressure acts on the glass cover to be formed so that the glass cover to be formed deforms and fits into the lower mold (220).

2. The production apparatus for 3D hyperboloid glass cover plates according to claim 1, characterized in that: The bottom wall of the pressure cylinder (110) is connected to an exhaust pipe (211) that communicates with the internal space of the rectangular frame (210), and a one-way valve (212) is provided on the exhaust pipe (211).

3. The production apparatus for 3D hyperboloid glass cover plates according to claim 2, characterized in that: The portion of the exhaust pipe (211) located between the one-way valve (212) and the port is connected to an extraction pipe (213), which is connected to an external vacuum pump.

4. The production apparatus for 3D hyperboloid glass cover plates according to claim 3, characterized in that: It also includes a lifting control mechanism (300), which includes four control cylinders (310) fixedly connected to the bottom wall of the pressure cylinder (110). Each of the four corners of the sealing frame (230) is fixedly connected to a slide rod (240). The four slide rods (240) are slidably inserted into the four control cylinders (310). Each of the four control cylinders (310) is provided with a pressure valve at the bottom. When the molded glass cover is heated and deformed, the sealing frame (230) moves down under gravity, and at the same time, the air in the control cylinder (310) is discharged through the pressure valve.

5. The production apparatus for 3D hyperboloid glass cover plates according to claim 1, characterized in that: The sealing frame (230) has multiple annular sealing strips (231) at the contact points with the glass cover to be formed.

6. The production apparatus for 3D hyperboloid glass cover plates according to claim 4, characterized in that: The four control cylinders (310) are connected by a first air pipe (350), and a second air pipe (360) is connected to the first air pipe (350). The second air pipe (360) is connected to an external vacuum pump. The exhaust pipe (211) and the exhaust pipe (213) are both equipped with gas detectors. When the gas detector detects that the inert gas inside the pressure cylinder (110) is leaking, the external vacuum pump connected to the second air pipe (360) runs, thereby driving the sealing frame (230) to fit into the glass cover plate to be formed.

7. The production apparatus for 3D hyperboloid glass cover plates according to claim 6, characterized in that: The second air pipe (360) is connected to a pressure stabilizing pipe (362), and a first pressure valve (361) is provided on the pressure stabilizing pipe (362). After the negative pressure intensity transmitted from the first air pipe (350) to the control cylinder (310) increases, the first pressure valve (361) opens, thereby reducing the negative pressure intensity in the control cylinder (310), and thus reducing the pressure applied by the sealing frame (230) to the glass cover plate to be formed.

8. The production apparatus for 3D hyperboloid glass cover plates according to claim 7, characterized in that: A slider (391) is fixedly connected to the lower surface of the lower mold (220), and a box (390) is fixedly connected to the bottom wall of the pressure cylinder (110). The slider (391) slides inside the box (390), and the side wall of the slider (391) is in contact with the inner wall of the box (390). When the air pressure inside the box (390) increases or decreases, the slider (391) can slide vertically inside the box (390), so that the lower mold (220) can rise or fall to be in a forming state or a material taking state.

9. The production apparatus for 3D hyperboloid glass cover plates according to claim 8, characterized in that: A third air pipe (370) is connected to the first air pipe (350), the third air pipe (370) is connected to the box body (390), and a second pressure valve (371) is provided on the third air pipe (370). The bottom wall of the housing (390) is connected to a discharge pipe (380), and a solenoid valve (381) is installed on the discharge pipe (380).

10. A manufacturing process for a 3D hyperboloid glass cover, using the manufacturing apparatus for a 3D hyperboloid glass cover as described in claim 9, characterized in that... Includes the following steps: Lift the sealing frame (230), place the glass cover to be formed on the lower mold (220), and control the pressure cylinder (110) to be in a sealed state. The glass cover to be formed is a special lithium aluminum silicate glass with a size of 170mm x 80mm and an original thickness of 0.8mm. Evacuate the pressure cylinder (110) to 5 Pa, then fill the pressure cylinder (110) with high-purity nitrogen gas, and cycle it three times until the oxygen content analyzer reading in the pressure cylinder (110) is 3 ppm. The glass was heated from 250°C to 885°C at an average rate of 30°C / min. After reaching 885°C, it was isothermally wetted for 150 seconds to ensure that the glass reached thermal equilibrium and uniform viscosity. After the homogenization is completed, inert gas is introduced into the pressure cylinder (110). When the inert gas is introduced, the pressure inside the pressure cylinder (110) changes as follows: for the first 30 seconds, it slowly rises from 0.1MPa to 1.0MPa; for the middle 40 seconds, it rapidly and linearly rises from 1.0MPa to 3.8MPa; and for the last 20 seconds, it gradually reaches the peak pressure of 4.0MPa. Under the peak pressure, the system holds the pressure for 240 seconds to ensure that the glass fully creeps and perfectly conforms to the complex isochronous curved surface contour of the mold. After molding, the process enters the online annealing stage. While maintaining a pressure of 4.0 MPa in the pressure cylinder (110), the temperature is cooled from 885°C to 600°C at a rate of 1.5°C / min. After reaching 600°C, the cooling rate is accelerated to 10°C / min, and at the same time, the pressure in the pressure cylinder (110) begins to decrease steadily at a rate of 0.2 MPa / min. After the internal temperature of the pressure cylinder (110) drops to 150°C and the internal pressure drops to atmospheric pressure, the formed glass cover is removed.

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