Curved plate forming device

Abstract

The present application belongs to the technical field of plate forming device, and discloses a curved plate forming device. The curved plate forming device comprises a lower die, an upper die and a supporting pre-pressing system. The lower die comprises a plurality of lower forming punches, the upper die comprises a plurality of upper forming punches, and the spacing between the plurality of upper forming punches and the plurality of lower forming punches is adjustable. The supporting pre-pressing system comprises a supporting pre-pressing mechanism, and the lower die and the upper die are respectively provided with the supporting pre-pressing mechanism on the side facing each other, and the supporting pre-pressing mechanism can be retracted relative to the lower forming punch or the upper forming punch. The plate is clamped between the supporting pre-pressing mechanism on the lower die and the supporting pre-pressing mechanism on the upper die, and during the process that the upper die approaches the lower die, the lower forming punch and the upper forming punch clamp and form the plate, and the supporting pre-pressing mechanism is retracted relative to the lower forming punch or the upper forming punch. The curved plate forming device can reliably position the plate during the plate forming manufacturing process, and improve the curved plate manufacturing efficiency and forming precision.

Description

Technical Field

[0001] This invention relates to the field of sheet metal forming equipment, and more particularly to a curved sheet metal forming equipment. Background Technology

[0002] A matrix mold is a flexible and adjustable mold consisting of an upper mold and a lower mold, each composed of several forming pressure heads. When forming a curved plate, the pressure heads of the upper and lower molds are first adjusted so that the envelope surface formed by the corresponding forming pressure heads is the target curved surface. Then, the plate is placed between the upper and lower molds, and a certain pressure is applied to the upper mold to form the target curved surface.

[0003] In existing curved plate forming devices, the plate is placed directly between the upper and lower molds during the forming process, without any clamping or supporting devices. Therefore, the plate may slide or shift before or during forming, resulting in a decrease in the forming accuracy of the curved plate.

[0004] Therefore, there is an urgent need for a curved plate forming device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a curved plate forming device that can reliably position the plate during the plate forming process, thereby improving the efficiency and forming accuracy of curved plate manufacturing.

[0006] To achieve this objective, the present invention adopts the following technical solution: Curved plate forming device, including: The lower mold and upper mold have adjustable spacing. The lower mold includes a plurality of lower forming heads, which are disposed on the side of the lower mold facing the upper mold. The spacing between the plurality of lower forming heads and the upper mold is adjustable. The upper mold includes a plurality of upper forming heads, which are disposed on the side of the upper mold facing the lower mold. The spacing between the plurality of upper forming heads and the lower mold is adjustable. A support pre-compression system includes a support pre-compression mechanism. The support pre-compression mechanism is respectively provided on one side of the lower mold and the upper mold facing each other. The support pre-compression mechanism provided on the lower mold can extend and retract relative to the lower forming head, and the support pre-compression mechanism provided on the upper mold can extend and retract relative to the upper forming head. The sheet metal can be clamped and positioned between the support pre-compression mechanism on the lower mold and the support pre-compression mechanism on the upper mold. As the upper mold approaches the lower mold, the lower forming head and the upper forming head can clamp and shape the sheet metal. The support pre-compression mechanism on the lower mold can retract relative to the lower forming head, and the support pre-compression mechanism on the upper mold can retract relative to the upper forming head.

[0007] As a preferred embodiment of the curved plate forming apparatus provided by the present invention, a plurality of the lower forming heads are arranged in a uniform array and close to each other; and / or Multiple upper forming heads are arranged in a uniform array and close to each other.

[0008] In a preferred embodiment of the curved plate forming apparatus provided by the present invention, the supporting pre-pressing mechanism located on the lower mold is disposed at the center position among the plurality of lower forming pressure heads; and / or The support pre-compression mechanism located on the upper mold is positioned at the center between the plurality of upper forming heads.

[0009] As a preferred embodiment of the curved plate forming apparatus provided by the present invention, the peripheral portion of the supporting pre-pressing mechanism located on the lower mold abuts against the peripheral portion of the lower forming pressure head; and / or, The peripheral portion of the support pre-compression mechanism located on the upper mold is in contact with the peripheral portion of the upper forming head.

[0010] As a preferred embodiment of the curved plate forming apparatus provided by the present invention, the supporting pre-compression mechanism disposed on the lower mold is a plurality of such mechanisms; and / or, The supporting pre-compression mechanism disposed on the upper mold is a plurality of such mechanisms.

[0011] As a preferred embodiment of the curved plate forming device provided by the present invention, the supporting pre-compression mechanism includes a mounting base and a telescopic mechanism. The mounting base is fixed in the lower mold or the upper mold. The telescopic mechanism includes a fixed cylinder and a piston structure. The fixed cylinder is connected to the mounting base. The piston structure is telescopically connected to the fixed cylinder and can telescopically extend and retract relative to the fixed cylinder. One end of the piston structure extending out of the fixed cylinder can abut against the plate.

[0012] As a preferred embodiment of the curved plate forming device provided by the present invention, the support pre-compression mechanism further includes a first connecting pipe, a reversing valve and an accumulator. The first connecting pipe is connected to the rodless chamber of the fixed cylinder and is selectively connected to a pressure source or an accumulator through the reversing valve. The pressure source can provide a pressure medium to the rodless chamber through the first connecting pipe to push the piston structure out of the fixed cylinder. When the upper mold approaches the lower mold, the piston structure moves under pressure, and the pressure medium in the rodless chamber can be released to the outside of the accumulator and / or the supporting pre-compression system.

[0013] As a preferred embodiment of the curved plate forming device provided by the present invention, the supporting pre-compression mechanism further includes a sheath structure, which is sleeved outside the fixed cylinder and connected to the piston structure, and the sheath structure can abut against the plate.

[0014] As a preferred embodiment of the curved plate forming device provided by the present invention, the supporting pre-compression mechanism further includes an elastic pad, which is disposed at one end of the sheath structure and can abut against the plate.

[0015] As a preferred embodiment of the curved plate forming device provided by the present invention, the abutting surface of the elastic pad is provided with an anti-slip structure.

[0016] The beneficial effects of this invention are: The curved plate forming apparatus provided by this invention includes a lower mold, an upper mold, and a support pre-pressing system. The distance between the lower mold and the upper mold is adjustable. The lower mold includes a plurality of lower forming pressure heads, which are disposed on the side of the lower mold facing the upper mold, and the distance between the plurality of lower forming pressure heads and the upper mold is adjustable. The upper mold includes a plurality of upper forming pressure heads, which are disposed on the side of the upper mold facing the lower mold, and the distance between the plurality of upper forming pressure heads and the lower mold is adjustable. Through the aforementioned lower forming pressure heads and upper forming pressure heads, the plate can be pressed against each other on opposite sides of the plate. As the upper mold approaches the lower mold, the lower forming pressure heads and upper forming pressure heads can clamp and shape the plate.

[0017] The support pre-compression system includes support pre-compression mechanisms. These mechanisms are respectively located on opposite sides of the lower and upper molds. The support pre-compression mechanism on the lower mold is retractable relative to the lower forming head, and the support pre-compression mechanism on the upper mold is retractable relative to the upper forming head. The sheet metal can be clamped and positioned between the support pre-compression mechanisms on the lower and upper molds. The support pre-compression mechanism on the lower mold is retractable relative to the lower forming head, and the support pre-compression mechanism on the upper mold is retractable relative to the upper forming head. This support pre-compression system allows for the pre-clamping and positioning of the sheet metal before forming curved panels, preventing displacement during the subsequent clamping and forming process by the lower and upper forming heads. This reliable positioning improves the efficiency and forming accuracy of curved panel manufacturing. Furthermore, the retraction of the support pre-compression mechanism during the curved panel forming process prevents interference with the forming process. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the curved plate forming device provided in an embodiment of the present invention in its first state; Figure 2 This is a schematic diagram of the curved plate forming device provided in an embodiment of the present invention in a second state; Figure 3 This is a schematic diagram of the curved plate forming device provided in an embodiment of the present invention in a third state; Figure 4 This is a schematic diagram of a support preloading system provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of another support preloading system provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of a supporting preloading mechanism provided in an embodiment of the present invention; Figure 7 This is an axial sectional view of a support preloading mechanism provided in an embodiment of the present invention.

[0020] In the picture: 10. Board material; 100. Lower mold; 110. Lower forming head; 200. Upper mold; 210. Upper forming head; 300. Supporting preload mechanism; 310. Mounting base; 320. Telescopic mechanism; 321. Fixed cylinder; 322. Piston structure; 330. Sheath structure; 340. Elastic gasket; 400. First connecting pipe; 500. Reversing valve; 600. Accumulator; 700, Second connecting pipe. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connect," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0029] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] Figure 1 This diagram illustrates the curved plate forming apparatus provided in an embodiment of the present invention in a first state. Figure 2 This diagram illustrates the curved plate forming apparatus provided in an embodiment of the present invention in a second state; Figure 3 This diagram illustrates the curved plate forming apparatus provided in an embodiment of the present invention in a third state. (Refer to...) Figures 1-3 This embodiment provides a curved plate forming device. The curved plate forming device includes a lower mold 100, an upper mold 200, and a support pre-compression system.

[0031] Specifically, the distance between the lower mold 100 and the upper mold 200 is adjustable. The lower mold 100 includes a plurality of lower forming heads 110, which are disposed on the side of the lower mold 100 facing the upper mold 200. The distance between the plurality of lower forming heads 110 and the upper mold 200 is adjustable. The upper mold 200 includes a plurality of upper forming heads 210, which are disposed on the side of the upper mold 200 facing the lower mold 100. The distance between the plurality of upper forming heads 210 and the lower mold 100 is adjustable. Through the aforementioned lower forming heads 110 and upper forming heads 210, the sheet material 10 can be abutted against on opposite sides. As the upper mold 200 approaches the lower mold 100, the lower forming heads 110 and the upper forming heads 210 can clamp and shape the sheet material 10.

[0032] More specifically, the support pre-compression system includes a support pre-compression mechanism 300. The support pre-compression mechanism 300 is respectively provided on one side of the lower mold 100 and the upper mold 200 facing each other. The support pre-compression mechanism 300 provided on the lower mold 100 can extend and retract relative to the lower forming head 110, and the support pre-compression mechanism 300 provided on the upper mold 200 can extend and retract relative to the upper forming head 210. The sheet 10 can be clamped between the support pre-compression mechanism 300 positioned on the lower mold 100 and the support pre-compression mechanism 300 on the upper mold 200. As the upper mold 200 approaches the lower mold 100, the lower forming head 110 and the upper forming head 210 can clamp and form the sheet 10. The support pre-compression mechanism 300 on the lower mold 100 can retract relative to the lower forming head 110, and the support pre-compression mechanism 300 on the upper mold 200 can retract relative to the upper forming head 210.

[0033] More specifically, the upper forming head 210 and the lower forming head 110 can both adopt telescopic cylinders or hydraulic structures, and their extension length can be set according to the user's needs, so as to form a curved surface that meets the requirements. Through the cooperation of multiple upper forming heads 210 and multiple lower forming heads 110, the sheet 10 is pressed against each other to form a curved plate that meets the requirements.

[0034] Alternatively, the plurality of lower forming heads 110 are arranged in a uniform array and close to each other. With the above arrangement, the lateral force between the plurality of lower forming heads 110 can be continuously transmitted, thereby improving the load-bearing capacity of the lower forming heads 110 and the structural stability between the plurality of lower forming heads 110.

[0035] Similarly, multiple upper forming heads 210 are evenly arrayed and arranged close to each other. Through the above arrangement, the lateral force between the multiple upper forming heads 210 can be continuously transmitted, improving the reliability of the upper forming heads 210 in pressing and enhancing the structural stability between the multiple upper forming heads 210.

[0036] Optionally, the support pre-compression mechanism 300 located on the lower die 100 is positioned at the center among the plurality of lower forming heads 110. The peripheral portion of the support pre-compression mechanism 300 abuts against the peripheral portion of the lower forming head 110. This arrangement ensures continuous transmission of lateral force between the support pre-compression mechanism 300 and the lower forming head 110 on the lower die 100, thereby improving the support performance of the support pre-compression mechanism 300 on the lower die 100.

[0037] Similarly, the support pre-compression mechanism 300 located on the upper mold 200 is positioned at the center among the plurality of upper forming heads 210. The peripheral portion of the support pre-compression mechanism 300 is in contact with the peripheral portion of the upper forming head 210. This arrangement ensures the continuous transmission of lateral force between the support pre-compression mechanism 300 and the upper forming head 210 on the upper mold 200, thereby improving the compressive stability of the support pre-compression mechanism 300 on the upper mold 200.

[0038] Preferably, multiple supporting pre-compression mechanisms 300 are provided on the lower mold 100. Multiple supporting pre-compression mechanisms 300 are also provided on the upper mold 200. In this embodiment, specifically four supporting pre-compression mechanisms 300 are provided on the lower mold 100, arranged in a rectangular array to provide stable support for the plate 10. In this embodiment, specifically four supporting pre-compression mechanisms 300 are provided on the upper mold 200, arranged in a rectangular array to provide stable and reliable pressure resistance to the plate 10.

[0039] Figure 4This diagram illustrates a support preloading system according to an embodiment of the present invention. (Refer to...) Figure 4 The support preloading system provided in this embodiment further includes a mounting base 310 and a telescopic mechanism 320. The mounting base 310 is fixed in the lower mold 100 or the upper mold 200. The telescopic mechanism 320 includes a fixed cylinder 321 and a piston structure 322. The fixed cylinder 321 is connected to the mounting base 310. The piston structure 322 is telescopically connected to the fixed cylinder 321 and can extend and retract relative to the fixed cylinder 321. One end of the piston structure 322 extending out of the fixed cylinder 321 can abut against the plate 10.

[0040] Specifically, the support preload system also includes a first connecting pipe 400, a reversing valve 500, and an accumulator 600. The first connecting pipe 400 has multiple first branches, each connected to the rodless chamber of a fixed cylinder 321. The first connecting pipe 400 is also selectively connected to a pressure source or the accumulator 600 via the reversing valve 500. The pressure source can supply pressure medium to the rodless chamber through the first connecting pipe 400 to push the piston structure 322 out of the fixed cylinder 321. In this embodiment, the pressure source can specifically be a hydraulic station or an air compressor to supply hydraulic oil to the fixed cylinder 321 or increase the air pressure within the fixed cylinder 321.

[0041] When needed, the pressure medium enters the rodless chamber through the first branch of the first connecting pipe 400, pushing the piston structure 322 to its maximum stroke position. When not in operation, the reversing valve 500 actuates, connecting the first connecting pipe 400 to the external oil tank supporting the pre-pressurization system (or directly to the atmosphere if the pressure medium is gas). At this time, under the pressure of the upper mold 200, the piston structure 322 moves to its minimum stroke position.

[0042] More specifically, the accumulator 600 is selectively connected to the rodless chamber of the fixed cylinder 321 via the first connecting pipe 400 and the reversing valve 500. When the upper mold 200 approaches the lower mold 100, the piston structure 322 is subjected to pressure and moves, allowing the pressure medium in the rodless chamber to be released into the accumulator 600. The gas in the accumulator 600 is compressed until the pressure in the pipeline supporting the pre-compression system no longer rises. When the pressure in the pipeline supporting the pre-compression system drops, the compressed gas in the accumulator 600 expands, forcing the pressure medium into the pipeline supporting the pre-compression system, thereby slowing down the pressure drop in the pipeline supporting the pre-compression system. By setting the accumulator 600, the stability of the supporting pre-compression system can be improved, enabling the two opposing supporting pre-compression mechanisms 300 to provide a relatively constant counter-compression force to the plate 10.

[0043] Figure 5 This diagram illustrates another support preloading system provided by an embodiment of the present invention; Figure 6This diagram illustrates a structural schematic of a preload support mechanism according to an embodiment of the present invention. Figure 7 This diagram shows an axial sectional view of a preload support mechanism provided in an embodiment of the present invention. (Refer to...) Figures 5-7 The other support preload system provided in this embodiment also includes a second connecting pipe 700, which includes a plurality of second branches, each of which is connected to the rod chamber of a fixed cylinder 321.

[0044] When needed, the pressure medium enters the rodless chamber through the first branch of the first connecting pipe 400, pushing the piston structure 322 to its maximum stroke position. When not in operation, the reversing valve 500 actuates, and the pressure medium enters the rod chamber through the second branch of the second connecting pipe 700, pushing the piston structure 322 to its minimum stroke position.

[0045] As a preferred option, refer to Figure 6 and Figure 7 The supporting preload mechanism 300 also includes a protective sleeve structure 330, which is sleeved on the fixed cylinder 321 and connected to the piston structure 322. The protective sleeve structure 330 can abut against the plate 10. The protective sleeve structure 330 can protect the fixed cylinder 321 and the piston structure 322.

[0046] Furthermore, the support pre-compression mechanism 300 also includes an elastic pad 340, which is disposed at one end of the sheath structure 330 and can abut against the plate 10. The elastic pad 340 protects the plate 10 and prevents rigid contact between the sheath structure 330 and the plate 10. In this embodiment, the elastic pad 340 can specifically be a rubber pad.

[0047] Furthermore, the abutting surface of the elastic pad 340 is provided with an anti-slip structure. This anti-slip structure may be a raised strip or raised dot, etc., protruding from the elastic pad 340, to achieve an anti-slip function.

[0048] The above description is merely a preferred embodiment of the present invention and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this invention is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-disclosed concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this invention.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A curved plate forming device, characterized in that, include: The lower mold (100) and upper mold (200) have adjustable spacing. The lower mold (100) includes a plurality of lower forming heads (110), which are disposed on the side of the lower mold (100) facing the upper mold (200). The spacing between the plurality of lower forming heads (110) and the upper mold (200) is adjustable. The upper mold (200) includes a plurality of upper forming heads (210), which are disposed on the side of the upper mold (200) facing the lower mold (100). The spacing between the plurality of upper forming heads (210) and the lower mold (100) is adjustable. The support pre-compression system includes a support pre-compression mechanism (300). The support pre-compression mechanism (300) is respectively provided on one side of the lower mold (100) and the upper mold (200) facing each other. The support pre-compression mechanism (300) provided on the lower mold (100) can extend and retract relative to the lower forming head (110), and the support pre-compression mechanism (300) provided on the upper mold (200) can extend and retract relative to the upper forming head (210). The sheet material (10) can be clamped between the support pre-pressing mechanism (300) positioned on the lower mold (100) and the support pre-pressing mechanism (300) on the upper mold (200). As the upper mold (200) approaches the lower mold (100), the lower forming head (110) and the upper forming head (210) can clamp and form the sheet material (10). The support pre-pressing mechanism (300) on the lower mold (100) can retract relative to the lower forming head (110), and the support pre-pressing mechanism (300) on the upper mold (200) can retract relative to the upper forming head (210).

2. The curved plate forming device according to claim 1, characterized in that, The plurality of the lower forming heads (110) are arranged in a uniform array and close to each other; and / or, Multiple upper forming heads (210) are arranged in a uniform array and close to each other.

3. The curved plate forming device according to claim 1, characterized in that, The support pre-compression mechanism (300) located on the lower die (100) is positioned at the center between the plurality of lower forming heads (110); and / or, The support pre-pressing mechanism (300) located on the upper mold (200) is positioned at the center between the plurality of upper forming heads (210).

4. The curved plate forming device according to claim 1, characterized in that, The peripheral portion of the support pre-compression mechanism (300) located on the lower mold (100) abuts against the peripheral portion of the lower forming head (110); and / or, The peripheral portion of the support pre-pressing mechanism (300) located on the upper mold (200) is in contact with the peripheral portion of the upper forming head (210).

5. The curved plate forming device according to claim 1, characterized in that, The supporting preloading mechanism (300) disposed on the lower mold (100) is a plurality of such mechanisms; and / or, The supporting pre-compression mechanism (300) disposed on the upper mold (200) comprises a plurality of such mechanisms.

6. The curved plate forming apparatus according to any one of claims 1-5, characterized in that, The supporting pre-compression mechanism (300) includes a mounting base (310) and a telescopic mechanism (320). The mounting base (310) is fixed in the lower mold (100) or the upper mold (200). The telescopic mechanism (320) includes a fixed cylinder (321) and a piston structure (322). The fixed cylinder (321) is connected to the mounting base (310). The piston structure (322) is telescopically connected to the fixed cylinder (321) and can telescopically extend relative to the fixed cylinder (321). One end of the piston structure (322) extending out of the fixed cylinder (321) can abut against the plate (10).

7. The curved plate forming apparatus according to claim 6, characterized in that, The support preload system also includes a first connecting pipe (400), a reversing valve (500), and an accumulator (600). The first connecting pipe (400) is connected to the rodless chamber of the fixed cylinder (321) and is selectively connected to a pressure source or an accumulator (600) through the reversing valve (500). The pressure source can provide a pressure medium to the rodless chamber through the first connecting pipe (400) to push the piston structure (322) out of the fixed cylinder (321). When the upper mold (200) approaches the lower mold (100), the piston structure (322) moves under pressure, and the pressure medium in the rodless chamber can be released to the outside of the accumulator (600) and / or the support preload system.

8. The curved plate forming apparatus according to claim 6, characterized in that, The support pre-compression mechanism (300) also includes a sheath structure (330), which is sleeved on the fixed cylinder (321) and connected to the piston structure (322). The sheath structure (330) can abut against the plate (10).

9. The curved plate forming apparatus according to claim 8, characterized in that, The support pre-compression mechanism (300) also includes an elastic pad (340), which is disposed at one end of the sheath structure (330) and can abut against the plate (10).

10. The curved plate forming apparatus according to claim 9, characterized in that, The abutment surface of the elastic pad (340) is provided with an anti-slip structure.

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