Radian shaping device and keycap production equipment

Abstract

The radian shaping device comprises a pressure maintaining mechanism and a shaping jig, and the shaping jig comprises a supporting unit and a downward pressing unit; the downward pressing unit comprises a pressing plate connected to the pressure maintaining mechanism and a pressing table arranged on the pressing plate, the section of the pressing table is in an arc shape, and the pressure maintaining mechanism is used for driving the pressing plate to move in the direction of the supporting unit, so that the pressing table presses the to-be-shaped metal sheet on the supporting unit, and the metal sheet can evenly deform in the stress state. The radian after shaping is ensured to accord with the preset specification, and the consistency of products is improved. And meanwhile, the arranged pressure maintaining mechanism can provide stable pressing force in the shaping process, and secondary deformation or surface damage of the metal sheets caused by too large local stress is avoided. The utility model further discloses keycap production equipment comprising the radian shaping device.

Description

TECHNICAL FIELD

[0001] The utility model relates to orthopedic technical field especially a kind of arc shaping device for the arc correction of metal sheet. BACKGROUND

[0002] In the field of electronic device manufacturing, metal sheets (such as keyboard reinforcing sheets, electronic device supports, etc.) are often used to provide structural support and enhance component strength. For example, in keyboard manufacturing, metal reinforcing sheets are often attached to the inside of long keys such as space bars to improve overall strength and optimize the pressing feel. These metal reinforcing sheets are typically combined with plastic components through processes such as lamination, hot melting, or stamping, and are designed with specific radii to meet ergonomic needs.

[0003] However, during processing, due to material properties, manufacturing tolerances, processing stresses, and process factors, metal reinforcing sheets may deform unevenly or warp, leading to uneven keyboard feel or assembly abnormalities. In general, these out-of-specification defective products are scrapped, but due to their high material and process costs, there is a significant waste. To address this situation, related technologies adjust the stamping or hot melting mold, which reduces deformation to some extent, but the mold modification cost is high and cannot completely eliminate the deformation problem.

[0004] The foregoing narrative is intended to provide general background information and may not necessarily constitute prior art. INVENTION CONTENTS

[0005] Therefore, the purpose of the present utility model is to provide an arc shaping device that can solve uneven deformation during processing.

[0006] The utility model provides a kind of arc shaping device, for shaping metal sheet into the shape of predetermined radius, including pressure maintaining mechanism and shaping fixture, the shaping fixture includes the support unit for supporting the metal sheet to be shaped, and the lower pressing unit can be moved relative to the support unit;

[0007] The lower pressing unit includes a pressing plate connected to the pressure maintaining mechanism, and a pressure table with an arc-shaped cross section disposed on the pressing plate. The pressure maintaining mechanism is used to drive the pressing plate to move towards the support unit, so that the pressure table presses the metal sheet to be shaped on the support unit.

[0008] In an embodiment, the support unit includes a support plate, a shaping table disposed on the support plate for supporting the product to be shaped, and the shaping table is configured as an arch shape that matches the pressure table.

[0009] In an embodiment, the supporting unit further comprises a plurality of positioning pins mounted on the supporting plate, the plurality of positioning pins are arranged around the shaping table to form a positioning area for limiting the position of the shaping table.

[0010] In an embodiment, the supporting unit further comprises a guide pin arranged on the supporting plate, and a guide hole is formed on the pressing plate for the guide pin to be inserted when the pressing plate moves towards the supporting unit.

[0011] In an embodiment, the pressing unit further comprises a gasket arranged on the surface of the pressing table and having elasticity.

[0012] In an embodiment, the pressure maintaining mechanism comprises a working frame, a pressure maintaining cylinder arranged at one end of the working frame, and a fixing plate drivingly connected to the pressure maintaining cylinder, the fixing plate being connected to the pressing plate.

[0013] In an embodiment, the arc shaping device further comprises a control unit and a pneumatic unit for driving the pressure maintaining cylinder, the control unit being communicatively connected to the pneumatic unit, and used for controlling the start and stop of the pressure maintaining cylinder through the pneumatic unit.

[0014] In an embodiment, the arc shaping device further comprises a time controller communicatively connected to the control unit, the time controller being preset with a pressure maintaining time, the time controller being used for receiving a signal sent by the control unit when the pressing table is pressing the metal sheet to be shaped, and starting timing, and feeding back a signal to the control unit when the pressing time reaches the preset pressure maintaining time, so that the control unit controls the pressure maintaining cylinder to stop pressing.

[0015] In an embodiment, the pressure maintaining mechanism further comprises a guide sleeve arranged on the working frame and a guide shaft arranged on the fixing plate, the guide shaft being movably mounted in the guide sleeve.

[0016] The utility model further provides a keycap production equipment, including above-mentioned arc shaping device.

[0017] The arc shaping device provided by the utility model can make the metal sheet uniformly deform under a stress state through the cooperation of the pressing table with an arc-shaped cross section and the supporting unit, ensure that the arc after shaping meets the predetermined specification, and improve the consistency of products. The pressure maintaining mechanism arranged at the same time can provide stable pressing force in the shaping process, and avoid the secondary deformation or surface damage of the metal sheet caused by excessive local stress. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those skilled in the art, other related drawings can be obtained without creative labor on the basis of the drawings.

[0019] Figure 1 The overall structural diagram of the radian shaping device is provided for the preferred embodiment of the present application.

[0020] Figure 2 The structural schematic diagram of the shaping fixture is provided for the preferred embodiment of the present application.

[0021] Figure 3 The structural schematic diagram of the shaping fixture is provided for the preferred embodiment of the present application.

[0022] Figure 4 The structural schematic diagram of the pressure maintaining mechanism is provided for the preferred embodiment of the present application.

[0023] Reference signs:

[0024] 1, pressure maintaining mechanism; 2, shaping fixture; 3, control area; 11, working frame; 12, pressure maintaining cylinder; 13, fixed plate; 14, guide shaft; 15, guide sleeve; 16, time controller; 17, pressure gauge; 18, safety grating; 21, supporting unit; 22, pressing unit; 211, supporting plate; 212, shaping table; 213, positioning pin; 214, guide pin; 221, pressing plate; 222, pressing table; 223, gasket; 224, guide hole. DETAILED DESCRIPTION

[0025] The specific embodiments of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the description of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0026] In the description of the present application, unless otherwise explicitly specified and limited, the terms "providing", "installing", "connecting" and the like should be broadly understood, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0027] The terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the utility model product is usually placed, and are merely for the convenience of description and simplification of the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0028] The terms "first", "second", "third" and the like merely distinguish similar attributes, and do not indicate or imply relative importance or a particular order.

[0029] The terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, in addition to including the listed elements, other elements not explicitly listed can also be included.

[0030] Please refer to Figures 1 to 3 The arc shaping device provided in the embodiment of the utility model, including pressure maintaining mechanism 1 and shaping fixture 2, shaping fixture 2 is used to bear the metal sheet to be shaped, and the pressure maintaining mechanism 1 is used to provide the pressure to realize the arc shaping of the metal sheet. In the embodiment, the pressure maintaining mechanism 1 can adopt pneumatic, hydraulic or other transmission mode, but is not limited to this. The shaping fixture 2 includes support unit 21 and lower pressing unit 22, wherein the support unit 21 is used to bear the metal sheet to be shaped and provide stable support to ensure that the metal sheet does not produce unnecessary displacement in the shaping process. The surface of the support unit 21 can be precisely designed according to the size and arc requirement of the metal sheet to be shaped to ensure good adhesion. The lower pressing unit 22 is arranged above the support unit 21 and can move relative to the support unit 21. The lower pressing unit 22 includes pressing plate 221 and pressing table 222, one end of the pressing plate 221 is connected to the pressure maintaining mechanism 1 and is used to bear and transmit the pressure applied by the pressure maintaining mechanism 1, and the pressing table 222 is arranged on the lower surface of the pressing plate 221, and the cross section of the pressing table 222 is arc-shaped. When the pressure maintaining mechanism 1 drives the pressing plate 221 to move towards the support unit 21, the pressing table 222 uniformly presses the metal sheet, so that the metal sheet is shaped into a predetermined arc.

[0031] In actual operation, after the metal sheet to be shaped is placed on the support unit 21, the pressure maintaining mechanism 1 is started, the pressing plate 221 and the arc-shaped pressing table 222 thereon are driven to move downwards, the pressing table 222 gradually presses the metal sheet, and uniform pressure is applied to make the metal sheet bend to a set arc. After reaching the set pressure maintaining time, the pressure maintaining mechanism 1 controls the pressing plate 221 to reset, the lower pressing unit 22 resets, and the shaping process is completed. Through the process, it can be ensured that the metal sheet is uniformly stressed during the shaping process, and local deformation or damage is avoided.

[0032] In this embodiment, the pressing table 222 and the pressing plate 221 are integrally formed, preventing relative displacement or assembly tolerance issues during the pressing process. This ensures uniform stress and precise curvature forming of the metal sheet during shaping. Furthermore, the integrated structure reduces the use of connectors, lowers the risk of loosening between components, and improves the durability and long-term stability of the equipment. Simultaneously, the surface of the pressing table 222 can be surface-treated (e.g., polished or coated with a wear-resistant layer) according to the material of different metal sheets to reduce friction, avoid scratches or indentations on the metal sheet surface, and improve the final product quality.

[0033] Furthermore, the support unit 21 includes a support plate 211 and a shaping table 212. The shaping table 212 is disposed on the support plate 211 to support the metal sheet to be shaped. The shaping table 212 is designed to be arched, and its curvature is adapted to the arc-shaped pressure table 222 of the pressing unit 22. Thus, during the pressing process, it can form a curved mold cavity together with the pressure table 222, ensuring that the metal sheet is clamped between the pressure table 222 and the shaping table 212 during pressing, so that it undergoes plastic deformation according to a predetermined curvature.

[0034] During the shaping process, after the metal sheet to be shaped is accurately placed on the shaping table 212, the pressure holding mechanism 1 drives the pressure plate 221 to move downwards, causing the arc-shaped pressure table 222 to gradually adhere to and press the metal sheet on the shaping table 212. As the pressure table 222 gradually applies pressure, the metal sheet is uniformly squeezed between the pressure table 222 and the shaping table 212, causing it to gradually deform and conform to the arched surface of the shaping table 212, ultimately forming a predetermined curvature that meets the design requirements. During the pressing process, the shaping table 212 can provide stable support force, preventing the metal sheet from experiencing localized depressions, springbacks, or uneven deformation due to uneven force. At the same time, the shape of the arc-shaped pressure table 222 is precisely matched with the shaping table 212, ensuring that the metal sheet is subjected to uniform force and preventing curvature deviations or material damage due to localized stress concentration.

[0035] In the above embodiments, although a bending mold cavity is formed between the forming table 212 and the pressure table 222 to achieve precise curvature shaping of the metal sheet, the forming table 212 typically needs to withstand vertical pressure from the pressure table 222. Furthermore, during repeated use, slight displacement may occur due to process errors or external forces, leading to a decrease in shaping accuracy. To avoid this problem, such as... Figure 2 As shown, in this embodiment, the support unit 21 further includes a plurality of positioning pins 213 mounted on the support plate 211. The plurality of positioning pins 213 are arranged around the shaping table 212 to form a positioning area for limiting the position of the shaping table 212. The arrangement of these positioning pins 213 can effectively fix the shaping table 212, so that it remains stable during the shaping process and will not shift its position due to uneven force or long-term use, thereby ensuring that the curvature of each shaping is consistent and improving the processing accuracy and production efficiency of the product.

[0036] Preferably, all positioning pins 213 are polished. Polishing results in a smoother surface on the positioning pins 213, effectively reducing the coefficient of friction between them and the shaping table 212. This allows for more precise placement and fixation of the shaping table 212, ensuring it is not affected by additional resistance during the shaping process. Furthermore, the smooth positioning pins 213 reduce the accumulation of dust or metal shavings, lowering equipment maintenance costs, extending service life, and improving the overall stability of the equipment. In practical applications, the positioning pins 213 can be made of wear-resistant stainless steel, chrome-plated alloy, or high-strength engineering plastics, and precision-machined to achieve a high surface finish, ensuring good wear resistance and stable positioning performance even after long-term use.

[0037] To further improve the pressing accuracy of the pressing unit 22 and ensure that the pressure plate 221 remains stably aligned during its movement toward the support unit 21, in this embodiment, the support unit 21 further includes a guide pin 214 disposed on the support plate 211, and the pressure plate 221 has a guide hole 224 for the guide pin 214 to be inserted. When the pressure holding mechanism 1 drives the pressure plate 221 to move downward, the guide pin 214 enters the guide hole 224, constraining the movement trajectory of the pressure plate 221, causing it to descend precisely along a preset path, avoiding offset or tilting caused by equipment tolerances or external force interference, and ensuring that the pressing table 222 can accurately press the metal sheet and uniformly shape it.

[0038] Specifically, guide pins 214 can be configured in two or more, symmetrically distributed on the support plate 211, to provide a more stable guiding effect. The guide pins 214 can be made of high-strength alloy steel or low-friction engineering plastic, and can undergo precision grinding or polishing to reduce frictional resistance and improve guiding accuracy. Meanwhile, the dimensions of the guide hole 224 match the guide pins 214, ensuring sufficient fitting precision during insertion, providing stable guidance without causing jamming.

[0039] In the above embodiments, although the cooperation between the pressing table 222 and the shaping table 212 can ensure that the metal sheet is gradually stressed and forms a predetermined curvature during the shaping process, the thinness of the metal sheet and the possible slight deformation differences during the pressing process can lead to uneven stress in local areas. This may cause wave deformation or local warping after shaping, affecting the quality and assembly accuracy of the final product. To solve the above problems, such as... Figure 3 As shown, in this embodiment, the pressing unit 22 further includes an elastic pad 223 disposed on the surface of the pressing table 222. The pad 223 is used to provide uniform contact force during the pressing process to ensure that all force-bearing surfaces of the metal sheet are uniformly pressed, avoid local stress concentration, and reduce the risk of wave deformation or other undesirable deformation after shaping.

[0040] Specifically, the gasket 223 can be made of high-temperature resistant silicone, polyurethane rubber, or other highly elastic and wear-resistant materials to ensure that it maintains stable elasticity and service life during repeated pressing. When the pressure holding mechanism 1 drives the pressure table 222 to apply pressure to the metal sheet, the elastic gasket 223 will undergo slight deformation upon initial contact, conforming to the surface of the metal sheet, and gradually releasing stress as pressing progresses, ensuring that the metal sheet is subjected to uniform force throughout the pressing process. This not only effectively prevents deformation caused by excessive pressure in local areas, but also improves the shaping quality, making the curvature of the finished product more precise and stable, and reducing the possibility of subsequent corrections or scrap.

[0041] In this embodiment, the pressure-holding mechanism 1 includes a working frame 11, a pressure-holding cylinder 12 disposed at one end of the working frame 11, and a fixed plate 13 connected to the pressure-holding cylinder 12. The fixed plate 13 is connected to the pressure plate 221. The working frame 11 supports and fixes the pressure-holding cylinder 12 and other mechanisms to ensure the stability of the shaping process. The pressure-holding cylinder 12, as a driving device, provides a stable and controllable pressing force, driving the fixed plate 13 and its connected pressure plate 221 to move downwards, causing the pressure table 222 to shape the metal sheet.

[0042] Specifically, the fixed plate 13 and the pressure plate 221 are rigidly connected to ensure that the pressure plate 221 can move stably in a predetermined direction under the drive of the pressure-holding cylinder 12, avoiding angular deviation or decreased shaping accuracy due to external interference or motion errors. Furthermore, the fixed plate 13 can be made of high-strength alloy steel or aluminum alloy to provide sufficient rigidity, ensuring stability and durability during long-term use. During the shaping process, the pressure-holding cylinder 12 pushes the fixed plate 13 downwards, thereby causing the pressure plate 221 and its pressure table 222 to descend synchronously, pressing and shaping the metal sheet. After the preset pressure-holding time is reached, the pressure-holding cylinder 12 returns to its original position, causing the fixed plate 13 and the pressure plate 221 to reset, completing one shaping operation.

[0043] To achieve precise control of the holding time, in this embodiment, the arc-shaped device further includes a control unit, a pneumatic unit, and a time controller 16. The control unit is communicatively connected to the pneumatic unit and sends signals to the pneumatic unit according to a preset program, instructing the pneumatic unit to start or stop the holding cylinder 12, thereby achieving precise pressing and return of the pressure plate 221. Additionally, the time controller 16 has a preset holding time, used for timing control when the pressure table 222 presses the metal sheet to be shaped. When the pressure table 222 presses the metal sheet to be shaped, the control unit sends a signal to the time controller 16, triggering the time controller 16 to start timing. After the preset holding time is reached, the time controller 16 sends a signal back to the control unit, causing the control unit to control the pneumatic unit to stop the holding cylinder 12, thereby returning the pressure plate 221 and the pressure table 222 to their original positions, completing the shaping process.

[0044] Preferably, the curvature shaping device further includes a control area 3, within which control buttons are provided. These control buttons are electrically connected to the control unit, allowing the operator to start and stop the curvature shaping device and control the pressing and return strokes of the pressure plate 221, thereby achieving precise forming of the metal sheet to be shaped. Simultaneously, the control area 3 is conveniently located within the working frame 11, facilitating operator access and preventing accidental activation that could disrupt equipment operation. The control buttons may include a start button, a stop button, and an emergency stop button to ensure the safety and controllability of equipment operation. Furthermore, the control buttons can be used in conjunction with indicator lights to display the equipment's operating status, enhancing the intuitiveness and convenience of operation.

[0045] Preferably, to improve operational safety, a safety light curtain 18 is also provided within the working frame 11. The safety light curtain 18 is used to detect whether there are obstacles or human hand interference in the operating area. When an abnormality is detected, it can promptly send a signal to the control unit, causing the control unit to stop the pressing action of the pressure holding mechanism 1, or trigger the emergency stop function, thereby effectively preventing accidental injury and equipment damage.

[0046] Optionally, the safety light curtain 18 is arranged in critical areas of the working frame 11, such as below the pressure plate 221 or in front of the operating area, using infrared beams or laser scanning, to ensure the operator is protected when adjusting or handling the metal sheet. The safety light curtain 18 is electrically connected to the control unit and can be used in conjunction with control buttons, indicator lights, and other components to improve equipment safety.

[0047] Preferably, the pneumatic unit includes a pressure gauge 17 and an oil-water separator at one end of the working frame 11. The pressure gauge 17 is used to monitor the working pressure of the pressure-holding cylinder 12 in real time, ensuring that the pneumatic unit is in a stable working state and avoiding the impact of insufficient or excessive air pressure on the shaping effect. The operator can intuitively read the current air pressure value through the pressure gauge 17 and adjust it as needed to meet the shaping requirements of metal sheets of different thicknesses or materials. In addition, the oil-water separator is used to remove moisture and impurities from the compressed air, preventing water vapor from entering the pneumatic unit and avoiding damage or performance degradation of pneumatic components due to moisture accumulation. The oil-water separator can be installed in the air line where the air source enters the working frame 11 and periodically discharges the separated moisture and impurities to maintain the stability and durability of the pneumatic unit.

[0048] Furthermore, to improve the stability of the pressure-holding mechanism 1, the pressure-holding mechanism 1 also includes a guide sleeve 15 disposed on the working frame 11 and a guide shaft 14 disposed on the fixed plate 13. The guide shaft 14 is movably mounted within the guide sleeve 15. When the fixed plate 13 moves under the drive of the pressure-holding cylinder 12, the guide shaft 14 slides within the guide sleeve 15, providing precise guidance for the downward pressing of the fixed plate 13, allowing the fixed plate 13 to move smoothly downward along the direction of the guide shaft 14, thereby driving the pressure plate 221 and the pressure table 222 to move downward synchronously, applying uniform pressure to the metal sheet to be shaped, avoiding uneven force caused by offset or shaking, and improving the stability of the shaping process. Preferably, a lubrication structure can also be provided inside the guide sleeve 15 to reduce friction of the guide shaft 14 during movement and improve its service life.

[0049] This utility model also provides a keycap production equipment, including the aforementioned arc shaping device.

[0050] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0051] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. An arc-shaping device for shaping a thin metal sheet into a predetermined arc shape, characterized in that, The arc-shaped shaping device comprises a pressure maintaining mechanism (1) and a shaping jig (2), the shaping jig (2) comprises a supporting unit (21) for supporting a metal sheet to be shaped, and a pressing unit (22) capable of moving relative to the supporting unit (21); The pressing unit (22) comprises a pressing plate (221) connected to the pressure maintaining mechanism (1), and an arc-shaped pressing table (222) provided on the pressing plate (221), the pressure maintaining mechanism (1) is used for driving the pressing plate (221) to move towards the supporting unit (21), so that the pressing table (222) presses the metal sheet to be shaped on the supporting unit (21).

2. The arc reshaping device of claim 1, wherein The supporting unit (21) comprises a supporting plate (211), a shaping table (212) provided on the supporting plate (211) and used for supporting a product to be shaped, the shaping table (212) is configured as an arch shape matched with the pressing table (222).

3. The arc reshaping device of claim 2, wherein The supporting unit (21) further comprises a plurality of positioning pins (213) mounted on the supporting plate (211), the plurality of positioning pins (213) are arranged around the shaping table (212) to form a positioning area for limiting the position of the shaping table (212).

4. The arc reshaping device of claim 2, wherein The supporting unit (21) further comprises a guide pin (214) provided on the supporting plate (211), and a guide hole (224) is formed in the pressing plate (221) for the guide pin (214) to be inserted when the pressing plate (221) moves towards the supporting unit (21).

5. The arc reshaping apparatus of claim 2 wherein, The pressing unit (22) further comprises a gasket (223) provided on the surface of the pressing table (222) and having elasticity.

6. The arc reshaping apparatus of claim 1 wherein, The pressure maintaining mechanism (1) comprises a working frame (11), a pressure maintaining cylinder (12) provided at one end of the working frame (11), and a fixed plate (13) drivingly connected to the pressure maintaining cylinder (12), the fixed plate (13) is connected with the pressing plate (221).

7. The arc reshaping apparatus of claim 6, wherein The arc-shaped shaping device further comprises a control unit and a pneumatic unit for driving the pressure maintaining cylinder (12), the control unit is in communication connection with the pneumatic unit, and is used for controlling the start and stop of the pressure maintaining cylinder (12) through the pneumatic unit.

8. The arc reshaping apparatus of claim 7, wherein The arc-shaped shaping device further comprises a time controller (16) in communication connection with the control unit, the time controller (16) is pre-set with a pressure maintaining time, and is used for receiving a signal sent by the control unit when the pressing table (222) presses the metal sheet to be shaped, and starting timing; and feeding back a signal to the control unit when the pressing time reaches the pre-set pressure maintaining time, so that the control unit controls the pressure maintaining cylinder (12) to stop pressing.

9. The arc reshaping apparatus of claim 6 wherein, The pressure maintaining mechanism (1) further comprises a guide sleeve (15) provided on the working frame (11), and a guide shaft (14) provided on the fixed plate (13), the guide shaft (14) is movably mounted in the guide sleeve (15).

10. A keycap production apparatus characterized by comprising: The arc-shaped shaping device comprises a pressure maintaining mechanism (1) and a shaping jig (2), the shaping jig (2) comprises a supporting unit (21) for supporting a metal sheet to be shaped, and a pressing unit (22) capable of moving relative to the supporting unit (21); The pressing unit (22) comprises a pressing plate (221) connected to the pressure maintaining mechanism (1), and an arc-shaped pressing table (222) provided on the pressing plate (221), the pressure maintaining mechanism (1) is used for driving the pressing plate (221) to move towards the supporting unit (21), so that the pressing table (222) presses the metal sheet to be shaped on the supporting unit (21). The supporting unit (21) comprises a supporting plate (211), a shaping table (212) provided on the supporting plate (211) and used for supporting a product to be shaped, the shaping table (212) is configured as an arch shape matched with the pressing table (222). The supporting unit (21) further comprises a plurality of positioning pins (213) mounted on the supporting plate (211), the plurality of positioning pins (213) are arranged around the shaping table (212) to form a positioning area for limiting the position of the shaping table (212). The supporting unit (21) further comprises a guide pin (214) provided on the supporting plate (211), and a guide hole (224) is formed in the pressing plate (221) for the guide pin (214) to be inserted when the pressing plate (221) moves towards the supporting unit (21). The pressing unit (22) further comprises a gasket (223) provided on the surface of the pressing table (222) and having elasticity. The pressure maintaining mechanism (1) comprises a working frame (11), a pressure maintaining cylinder (12) provided at one end of the working frame (11), and a fixed plate (13) drivingly connected to the pressure maintaining cylinder (12), the fixed plate (13) is connected with the pressing plate (221). The arc-shaped shaping device further comprises a control unit and a pneumatic unit for driving the pressure maintaining cylinder (12), the control unit is in communication connection with the pneumatic unit, and is used for controlling the start and stop of the pressure maintaining cylinder (12) through the pneumatic unit. The arc-shaped shaping device further comprises a time controller (16) in communication connection with the control unit, the time controller (16) is pre-set with a pressure maintaining time, and is used for receiving a signal sent by the control unit when the pressing table (222) presses the metal sheet to be shaped, and starting timing; and feeding back a signal to the control unit when the pressing time reaches the pre-set pressure maintaining time, so that the control unit controls the pressure maintaining cylinder (12) to stop pressing. The pressure maintaining mechanism (1) further comprises a guide sleeve (15) provided on the working frame (11), and a guide shaft (14) provided on the fixed plate (13), the guide shaft (14) is movably mounted in the guide sleeve (15). The arc-shaped shaping device comprises a pressure maintaining mechanism (1) and a shaping jig (2), the shaping jig (2) comprises a supporting unit (21) for supporting a metal sheet to be shaped, and a pressing unit (22) capable of moving relative to the supporting unit (21); The pressing unit (22) comprises a pressing plate (221) connected to the pressure maintaining mechanism (1), and an arc-shaped pressing table (222) provided on the pressing plate (221), the pressure maintaining mechanism (1) is used for driving the pressing plate (221) to move towards the supporting unit (21), so that the pressing table (222) presses the metal sheet to be shaped on the supporting unit (21). The supporting unit (21) comprises a supporting plate (211), a shaping table (212) provided on the supporting plate (211) and used for supporting a product to be shaped, the shaping table (212) is configured as an arch shape matched with the pressing table (222). The supporting unit (21) further comprises a plurality of positioning pins (213) mounted on the supporting plate (211), the plurality of positioning pins (213) are arranged around the shaping table (212) to form a positioning area for limiting the position of the shaping table (212). The supporting unit (21) further comprises a guide pin (214) provided on the supporting plate (211), and a guide hole (224) is formed in the pressing plate (221) for the guide pin (214) to be inserted when the pressing plate (221) moves towards the supporting unit (21). The pressing unit (22) further comprises a gasket (223) provided on the surface of the pressing table (222) and having elasticity. The pressure maintaining mechanism (1) comprises a working frame (11), a pressure maintaining cylinder (12) provided at one end of the working frame (11), and a fixed plate (13) drivingly connected to the pressure maintaining cylinder (12), the fixed plate (13) is connected with the pressing plate (221). The arc-shaped shaping device further comprises a control unit and a pneumatic unit for driving the pressure maintaining cylinder (12), the control unit is in communication connection with the pneumatic unit, and is used for controlling the start and stop of the pressure maintaining cylinder (12) through the pneumatic unit. The arc-shaped shaping device further comprises a time controller (16) in communication connection with the control unit, the time controller (16) is pre-set with a pressure maintaining time, and is used for receiving a signal sent by the control unit when the pressing table (222) presses the metal sheet to be shaped, and starting timing; and feeding back a signal to the control unit when the pressing time reaches the pre-set pressure maintaining time, so that the control unit controls the pressure maintaining cylinder (12) to stop pressing. The pressure maintaining mechanism (1) further comprises a guide sleeve (15) provided on the working frame (11), and a guide shaft (14) provided on the fixed plate (13), the guide shaft (14) is movably mounted in the guide sleeve (15). The arc-shaped shaping device comprises a pressure maintaining mechanism (1) and a shaping jig (2), the shaping jig (2) comprises a supporting unit (21) for supporting a metal sheet to be shaped, and a pressing unit (22) capable of moving relative to the supporting unit (21); The pressing unit (22) comprises a pressing plate (221) connected to the pressure maintaining mechanism (1), and an arc-shaped pressing table (222) provided on the pressing plate (221), the pressure maintaining mechanism (1) is used for driving the pressing plate (221) to move towards the supporting unit (21), so that the pressing table (222) presses

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