Forming die and method for a composite material frame structure having a grid-like opening

Abstract

This invention proposes a molding die and method for a composite material frame structure with a grid-like opening, belonging to the field of composite material structure molding technology. In this molding die for the composite material frame structure with a grid-like opening, multiple upper-opening preformed blocks can be installed on an upper mounting plate, and the perimeter of each upper-opening preformed block can be covered with prepreg; multiple lower-opening preformed blocks can be installed on a lower mounting plate, and the perimeter of each lower-opening preformed block can be covered with prepreg; when the lower mounting plate and the upper mounting plate are connected, the upper and lower-opening preformed blocks are located between the lower and upper mounting plates, and prepreg can be laid between the upper and lower-opening preformed blocks. A pressure-applying component is used to apply pressure to the molding component with the prepreg laid or covered. This method enables the integrated molding, co-curing, and demolding of the composite material frame structure with a grid-like opening, better leveraging the mechanical properties of carbon fiber composite materials.

Description

Technical Field

[0001] This invention belongs to the field of molding technology of composite material structures, and in particular relates to a molding die and method for a composite material frame structure with a grid-like opening. Background Technology

[0002] Carbon fiber composite materials have been widely used in various fields, including aerospace, and for civilian, military, and commercial applications. Their lightweight and high-strength characteristics are synonymous with their advantages, making them suitable for various load-bearing structures, such as those in spacecraft. Furthermore, the high design flexibility of carbon fiber composite structures has gradually replaced many traditional metal materials, securing a dominant market position in diverse structural components.

[0003] Carbon fiber composite frames with a double-layer mesh-like opening structure offer advantages such as high strength and vibration resistance. One-piece molding of these frames significantly reduces the generation of excess material, improves product quality, mitigates weight deviations caused by glued redundant structural components, and ensures fiber continuity. The double-layer mesh-like opening structure means that both the top and bottom sides must be opened simultaneously during molding. After a single curing and demolding process, the central flat structure and the two mesh-like opening structures are integrally formed. The mold ensures the product's structural form and precision, minimizing glued and screwed connections between parts, reducing machining and assembly difficulties, and guaranteeing surface flatness and profile accuracy. This helps meet structural requirements, enhances product designability, and facilitates subsequent product loading. However, currently, there are no molding dies or methods capable of one-piece molding of carbon fiber composite frames with a double-layer mesh-like opening structure. Summary of the Invention

[0004] In view of this, in order to solve the problem that there is currently no molding die and method for forming a carbon fiber composite frame with a double-layer mesh-like opening structure in one step, the present invention proposes a molding die and method for a composite material frame structure with mesh-like openings.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A molding die for a composite material frame structure with a mesh-like opening includes:

[0007] A molding assembly includes an upper mounting plate, a plurality of upper-opening preformed blocks, a lower mounting plate, and a plurality of lower-opening preformed blocks. The upper-opening preformed blocks are all mountable to the upper mounting plate and are configured such that their perimeter can be covered with prepreg. The lower mounting plate and the upper mounting plate are detachably connected. When the lower mounting plate and the upper mounting plate are connected, the upper-opening preformed blocks and the lower-opening preformed blocks are located between the lower mounting plate and the upper mounting plate, and prepreg can be laid between the upper-opening preformed blocks and the lower-opening preformed blocks.

[0008] A pressurizing assembly for pressurizing a molded assembly that has been laid or covered with prepreg.

[0009] As a preferred embodiment of the molding die for the aforementioned composite material frame structure with a grid-like opening, the pressurizing assembly includes multiple external pressurizing seats, multiple pressurizing bolts, and multiple side pressurizing plates. The multiple external pressurizing seats are all fixedly disposed on the lower mounting plate, and the multiple external pressurizing seats are spaced apart. Each external pressurizing seat is screwed to at least one of the pressurizing bolts, and the pressurizing bolts can abut against the side pressurizing plates so that the side pressurizing plates are pressed against the prepreg covering the upper opening preformed block and / or the lower opening preformed block.

[0010] As a preferred embodiment of the molding die for the aforementioned composite material frame structure with a grid-like opening, the pressurizing assembly includes an upper pressurizing plate and a middle pressurizing plate. The upper mounting plate is provided with a clearance opening. The upper pressurizing plate includes a first abutting part and a second abutting part fixedly disposed thereon. The first abutting part can abut against the top surface of the upper mounting plate, and the second abutting part passes through the clearance opening and abuts against the middle pressurizing plate. The middle pressurizing plate is located between the upper mounting plate and the lower opening preformed block, and the middle pressurizing plate can abut against the prepreg laid between the upper opening preformed block and the lower opening preformed block.

[0011] As a preferred embodiment of the molding die for the aforementioned composite material frame structure with a grid-like opening, the upper mounting plate is fixedly provided with a connecting protrusion, and the lower mounting plate is provided with a connecting groove, wherein the connecting protrusion can be engaged with the connecting groove.

[0012] As a preferred embodiment of the molding die for the composite material frame structure with the above-mentioned mesh-like opening, the molding die for the composite material frame structure with the mesh-like opening further includes a first fixing bolt, and the upper mounting plate and the upper opening preformed block are fixedly connected by the first fixing bolt.

[0013] As a preferred embodiment of the molding die for the composite material frame structure with the above-mentioned mesh-like opening, the molding die for the composite material frame structure with the mesh-like opening further includes a first positioning pin. Both the upper mounting plate and the upper opening preform are provided with a first positioning hole, and the first positioning pin passes through the first positioning hole of the upper mounting plate and the upper opening preform.

[0014] As a preferred embodiment of the molding die for the composite material frame structure with the above-mentioned mesh-like opening, the molding die for the composite material frame structure with the mesh-like opening further includes a second fixing bolt, and the lower mounting plate and the lower opening preform block are fixedly connected by the second fixing bolt.

[0015] As a preferred embodiment of the molding die for the composite material frame structure with the above-mentioned mesh-like opening, the molding die for the composite material frame structure with the mesh-like opening further includes a second positioning pin. Both the lower mounting plate and the lower opening preform are provided with second positioning holes, and the second positioning pin passes through the second positioning holes of the lower mounting plate and the lower opening preform.

[0016] A molding method for a composite material frame structure with mesh-like openings, employing the aforementioned molding die for the composite material frame structure with mesh-like openings, includes:

[0017] S1: Wrap each top-opening preformed block around its perimeter with prepreg; wrap each bottom-opening preformed block around its perimeter with prepreg.

[0018] S2: Install multiple pre-formed blocks with upper openings onto the upper mounting plate;

[0019] S3: Install multiple preformed blocks with lower openings onto the lower mounting plate, and clamp the edge of a prepreg between the lower mounting plate and the preformed blocks with lower openings, the remaining part of the prepreg being the prepreg to be used;

[0020] S4: Turn the prepreg to be used over so that it covers one side of the preformed block with the lower opening and then lay it on top of the preformed block with the lower opening.

[0021] S5: Connect the upper mounting plate to the lower mounting plate, and make the upper open preformed block contact the prepreg to be used;

[0022] S6: Pressurization components are used to pressurize the upper mounting plate, lower mounting plate, upper open preformed block, and lower open preformed block.

[0023] As a preferred embodiment of the molding method for the aforementioned composite material frame structure with mesh-like openings, the method further includes the following step between S1 and S2:

[0024] The air bubbles between the prepreg covering the upper opening preform and the upper opening preform are removed by vacuum pre-compression, and the air bubbles between the prepreg covering the lower opening preform and the lower opening preform are removed.

[0025] Compared with the prior art, the beneficial effects of the molding die and method for a composite material frame structure with a mesh-like opening provided by the present invention are:

[0026] 1. This invention provides a molding die and method for a composite material frame structure with mesh-like openings. The molding die is used to form the composite material frame structure with mesh-like openings in one step. The composite material frame structure with mesh-like openings includes a central plate and two mesh-like opening structures located on the upper and lower sides of the central plate, respectively. There are no other metal materials connecting them; all are composite material structures, fixedly connected through integral molding. The mesh-like opening structures on the upper and lower sides can be symmetrical or asymmetrical. When forming the composite material frame structure with mesh-like openings using this molding die, each upper opening preform and each lower opening preform are covered with prepreg. Then, the upper opening preform covered with prepreg is installed on the upper mounting plate, and the lower opening preform covered with prepreg is installed on the lower mounting plate. Before installation, the edge of one prepreg is sandwiched between the lower opening preform and the lower mounting plate. The remaining portion of the prepreg is reserved prepreg along the fiber length direction. After installing the lower open preform, flip the prepreg material around one side of the lower open preform and flip it onto the upper open preform, i.e., onto the side of the lower open preform away from the lower mounting plate. Then connect the upper and lower mounting plates. At this point, both the upper and lower open preforms are located between the upper and lower mounting plates, and the flipped prepreg material is located between and in contact with the upper and lower open preforms. Finally, use the pressure assembly to apply pressure to the installed molding assembly in the vertical and circumferential directions.

[0027] 2. This invention provides a molding die and method for a composite material frame structure with a mesh-like opening. The molding die for this composite material frame structure involves installing an upper-opening preformed block covered with a certain thickness of prepreg onto an upper mounting plate. Multiple upper-opening preformed blocks are joined to form an upper mesh-like opening structure. A lower-opening preformed block covered with a certain thickness of prepreg is installed onto a lower mounting plate. Multiple lower-opening preformed blocks are joined to form a lower mesh-like opening structure. The prepreg laid between the upper and lower opening preformed blocks will connect with the prepreg surrounding both the upper and lower opening preformed blocks after molding, thereby obtaining an integrally molded composite material frame structure with a mesh-like opening. This method enables seamless integral molding, co-curing, and demolding of the composite material frame structure with a mesh-like opening, better leveraging the mechanical properties of carbon fiber composites.

[0028] 3. This invention provides a molding die and method for a composite material frame structure with a grid-like opening. In the molding die for the composite material frame structure with a grid-like opening, the size and shape of the upper opening preform and the lower opening preform can be designed according to the adaptability of the product to be prepared. Compared with traditional molding dies, it is completely unrestricted and easy to demold. Metal core molds can be used for preforming, or non-metallic molds can be used for preforming, such as PMI foam or sand core molds. However, for openings that are too small, non-metallic molds must be used. Therefore, the molding die for the composite material frame structure with a grid-like opening can form products of various sizes, thicknesses, shapes, and complex cavity structures. Attached Figure Description

[0029] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0030] Figure 1 This is an exploded schematic diagram of a molding die for a composite material frame structure with mesh-like openings provided in a specific embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the upper mounting plate of a molding die for a composite material frame structure with a mesh-like opening, provided in a specific embodiment of the present invention.

[0032] Figure 3 This is an assembly diagram of the upper mounting plate and the upper opening preform block of the molding die for a composite material frame structure with a mesh-like opening, provided in a specific embodiment of the present invention.

[0033] Figure 4This is an assembly diagram of the lower mounting plate and the lower opening preform block of the molding die for a composite material frame structure with a mesh-like opening, provided in a specific embodiment of the present invention.

[0034] Figure 5 This is a schematic diagram of the structure of a product prepared using a molding die with a composite material frame structure having a mesh-like opening, as provided in a specific embodiment of the present invention.

[0035] In the picture:

[0036] 1. Upper mounting plate; 11. Connecting protrusion;

[0037] 2. Top-opening preformed block;

[0038] 3. Lower mounting plate; 31. Connecting groove;

[0039] 4. Preformed block with bottom opening;

[0040] 5. External pressure seat;

[0041] 6. Side pressure plates;

[0042] 7. Apply pressure plate;

[0043] 8. Medium pressure plate;

[0044] 100. Upper mesh-like opening structure; 200. Lower mesh-like opening structure; 300. Middle plate. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0046] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] 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.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0049] See Figure 1-5 This invention provides a molding die and method for a composite material frame structure with a grid-like opening. The molding die for the composite material frame structure with a grid-like opening includes a molding component and a pressurizing component. The molding component includes an upper mounting plate 1, a plurality of upper-opening preformed blocks 2, a lower mounting plate 3, and a plurality of lower-opening preformed blocks 4. The plurality of upper-opening preformed blocks 2 can be mounted on the upper mounting plate 1, and the upper-opening preformed blocks 2 are configured such that their four sides can be covered with prepreg. The plurality of lower-opening preformed blocks 4 can be mounted on the lower mounting plate 3, and the lower-opening preformed blocks 4 are configured such that their four sides can be covered with prepreg. The lower mounting plate 3 and the upper mounting plate 1 are detachably connected. When the lower mounting plate 3 and the upper mounting plate 1 are connected, the upper-opening preformed blocks 2 and the lower-opening preformed blocks 4 are located between the lower mounting plate 3 and the upper mounting plate 1, and prepreg can be laid between the upper-opening preformed blocks 2 and the lower-opening preformed blocks 4. The pressurizing component is used to pressurize the molding component with the prepreg laid or covered.

[0050] The molding die for the composite material frame structure with mesh-like openings is used for one-time molding of the composite material frame structure with mesh-like openings. The composite material frame structure with mesh-like openings includes a middle plate 300 and an upper mesh-like opening structure 100 and a lower mesh-like opening structure 200 located on the upper and lower sides of the middle plate 300, respectively. There are no other metal materials connecting them; all are composite material structures, and they are fixedly connected through integral molding. The upper mesh-like opening structure 100 and the lower mesh-like opening structure 200 can be symmetrical or asymmetrical. When molding the composite frame structure with a mesh-like opening using a molding die, each upper-opening preform 2 and each lower-opening preform 4 is covered with prepreg around its perimeter. Then, the prepreg-covered upper-opening preform 2 is installed on the upper mounting plate 1, and the prepreg-covered lower-opening preform 4 is installed on the lower mounting plate 3. Before installation, the edge of one prepreg is sandwiched between the lower-opening preform 4 and the lower mounting plate 3. The remaining portion of this prepreg is reserved prepreg, which is prepreg reserved along the fiber length direction. After the open preform block 4 is formed, the prepreg material to be used is flipped around one side of the lower open preform block 4 and flipped onto the lower open preform block 4, that is, onto the side of the lower open preform block 4 away from the lower mounting plate 3. Then the upper mounting plate 1 and the lower mounting plate 3 are connected. At this time, the upper open preform block 2 and the lower open preform block 4 are both located between the upper mounting plate 1 and the lower mounting plate 3. The flipped prepreg material to be used is located between the upper open preform block 2 and the lower open preform block 4 and is in contact with them. Finally, the pressure assembly is used to apply pressure to the assembled molding assembly in the vertical and circumferential directions.

[0051] The molding die for this composite material frame structure with a grid-like opening mounts an upper-opening preform 2 covered with a certain thickness of prepreg on an upper mounting plate 1. Multiple upper-opening preforms 2 are joined together to form an upper grid-like opening structure 100. Lower-opening preforms 4 covered with a certain thickness of prepreg are mounted on a lower mounting plate 3. Multiple lower-opening preforms 4 are joined together to form a lower grid-like opening structure 200. The prepreg laid between the upper-opening and lower-opening preforms 2 and 4 will connect with the prepreg surrounding both the upper-opening and lower-opening preforms 2 and 4 after molding, resulting in an integrally molded composite material frame structure with a grid-like opening. This method successfully achieves integral molding, co-curing, and demolding of the composite material frame structure with a grid-like opening, better leveraging the mechanical properties of carbon fiber composites.

[0052] In this process, prepreg is applied to the upper-opening preformed block 2 and the lower-opening preformed block 4 to symmetrically and equally distribute the mesh thickness of the product to be prepared. The mesh-like opening structure is formed by splicing multiple upper-opening preformed blocks 2 and multiple lower-opening preformed blocks 4 together. The forming thickness depends on the thickness of the mesh reinforcement; generally, half the thickness of the mesh reinforcement is evenly distributed between two adjacent upper-opening preformed blocks 2 or lower-opening preformed blocks 4. The thickness of the prepreg laid between the upper and lower preformed blocks depends on the thickness of the intermediate plate 300 of the product to be prepared.

[0053] In the molding die for the composite material frame structure with a grid-like opening, the size and shape of the upper opening preform 2 and the lower opening preform 4 can be designed to adapt to the product to be prepared. Compared with traditional molding dies, it is completely unrestricted and easy to demold. Metal core molds can be used for preforming, or non-metallic molds such as PMI foam or sand core molds can be used for preforming. However, for openings that are too small, non-metallic molds must be used. Therefore, the molding die for the composite material frame structure with a grid-like opening can form products of various sizes, thicknesses, shapes, and complex cavity structures.

[0054] Preferably, the pressurizing assembly includes multiple external pressurizing seats 5, multiple pressurizing bolts, and multiple side pressurizing plates 6. The multiple external pressurizing seats 5 are all fixedly mounted on the lower mounting plate 3, and are spaced apart. Each external pressurizing seat 5 is screwed to at least one pressurizing bolt, which abuts against the side pressurizing plate 6 to press the side pressurizing plate 6 against the prepreg covering the upper open preformed block 2 and / or the lower open preformed block 4. The external pressurizing seats 5 are fixed at the edge of the lower mounting plate 3. After the pressurizing bolts are screwed to the external pressurizing seats 5, it is understood that the nuts of the pressurizing bolts do not abut against the external pressurizing seats 5 at this point; the ends of the pressurizing bolts abut against the side pressurizing plates 6. Continuing to rotate the pressurizing bolts pushes the side pressurizing plates 6 against the upper open preformed block 2 and / or the lower open preformed block 4. The number and shape of the side pressurizing plates 6 can be designed to adapt to the shape of the product to be manufactured.

[0055] Preferably, the pressurizing assembly includes an upper pressure plate 7 and a middle pressure plate 8. The upper mounting plate 1 has a clearance opening. The upper pressure plate 7 includes a first abutment portion and a second abutment portion fixedly disposed thereon. The first abutment portion can abut against the top surface of the upper mounting plate 1, and the second abutment portion passes through the clearance opening and abuts against the middle pressure plate 8. The middle pressure plate 8 is located between the upper mounting plate 1 and the lower open preformed block 4, and the middle pressure plate 8 can abut against the prepreg laid between the upper open preformed block 2 and the lower open preformed block 4. The middle pressure plate 8 is used to press the prepreg laid between the upper open preformed block 2 and the lower open preformed block 4, and the upper pressure plate 7 is used to press the middle pressure plate 8 and the upper mounting plate 1 together. The press can perform vertical and horizontal pressing and mold closing on the upper pressure plate 7. To prevent product deformation or rebound after pressurization, the product needs to be cured on the press to ensure mold closing accuracy.

[0056] Preferably, the upper mounting plate 1 is fixedly provided with a connecting protrusion 11, and the lower mounting plate 3 is provided with a connecting groove 31, and the connecting protrusion 11 can be engaged with the connecting groove 31. After the connecting protrusion 11 is engaged with the connecting groove 31, the positions of the upper mounting plate 1 and the lower mounting plate 3 can be positioned and connected, which can ensure that the double-layer mesh-like opening structure of the prepared product does not experience interlayer displacement.

[0057] In this embodiment, the connecting protrusion 11 and the connecting groove 31 are respectively disposed at the edges of the upper mounting plate 1 and the lower mounting plate 3. The design of the connecting protrusion 11 and the connecting groove 31 ensures that the upper and lower mesh-like opening structures of the manufactured product do not misalign, thereby positioning the relative positions of the upper and lower mesh-like opening structures and ensuring the accuracy of the correspondence between the upper and lower mesh-like opening structures.

[0058] Preferably, the molding die for the composite material frame structure with a mesh-like opening further includes a first positioning pin. Both the upper mounting plate 1 and the upper open preformed block 2 are provided with first positioning holes, and the first positioning pin passes through the first positioning holes of the upper mounting plate 1 and the upper open preformed block 2. The upper mounting plate 1 and the upper open preformed block 2 are positioned by the first positioning pin, which can ensure the accuracy and outline dimensions of the upper mesh-like opening structure 100 of the prepared product.

[0059] Preferably, the molding die for the composite material frame structure with a grid-like opening further includes a first fixing bolt, and the upper mounting plate 1 and the upper opening preformed block 2 are fixedly connected by the first fixing bolt. After the position of the upper opening preformed block 2 is positioned by the first locating pin, it is then fixed by the first fixing bolt.

[0060] Preferably, the molding die for the composite material frame structure with a mesh-like opening further includes a second positioning pin. Both the lower mounting plate 3 and the lower opening preformed block 4 are provided with second positioning holes, and the second positioning pin passes through the second positioning holes of the lower mounting plate 3 and the lower opening preformed block 4. The lower mounting plate 3 and the lower opening preformed block 4 are positioned by the second positioning pin, ensuring the accuracy and outline dimensions of the lower mesh-like opening structure 200 of the prepared product.

[0061] Preferably, the molding die for the composite material frame structure with a grid-like opening further includes a second fixing bolt, and the lower mounting plate 3 and the lower opening preformed block 4 are fixedly connected by the second fixing bolt. After the position of the lower opening preformed block 4 is positioned by the second locating pin, it is then fixed by the second fixing bolt.

[0062] The present invention also provides a molding method for a composite material frame structure with mesh-like openings, using the above-mentioned molding die for the composite material frame structure with mesh-like openings, comprising:

[0063] S1: Cover each top-opening preformed block 2 with prepreg around its perimeter; cover each bottom-opening preformed block 4 with prepreg around its perimeter.

[0064] The preformed blocks with upper and lower openings 4, which are covered with prepreg on all sides, are easy to demold after molding, and the remaining prepreg will form a grid-like opening structure.

[0065] Vacuum pre-compression is used to remove air bubbles between the prepreg covering the upper open preformed block 2 and the prepreg covering the lower open preformed block 4. This ensures the quality of the installation and the thickness of the cavity, laying the foundation for the subsequent splicing and embedding of the upper open preformed block 2 and the lower open preformed block 4.

[0066] S2: Install multiple pre-formed blocks 2 with upper openings onto the upper mounting plate 1.

[0067] S3: Install multiple preformed blocks 4 with lower openings onto the lower mounting plate 3, and clamp the edge of a prepreg between the lower mounting plate 3 and the preformed blocks 4. The remaining portion of this prepreg is reserved for later use. Reserved prepreg is prepreg that is kept along the fiber length direction for future use.

[0068] S4: Turn the prepreg to be used over so that it covers one side of the lower open preform 4 and lay it on top of the lower open preform 4. That is, lay it on the side of the lower open preform 4 away from the lower mounting plate 3. This part of the prepreg will be between the upper open preform 2 and the lower open preform 4, and will form a middle plane after molding.

[0069] S5: Connect the upper mounting plate 1 and the lower mounting plate 3, and bring the upper open preformed block 2 into contact with the prepreg to be used. At this time, the upper mounting plate 1, the upper open preformed block 2, the prepreg to be used, the lower open preformed block 4, and the lower mounting plate 3 are distributed sequentially from top to bottom. The prepreg to be used can connect the prepreg covering the upper open preformed block 2 and the prepreg covering the lower open preformed block 4.

[0070] S6: Pressurization components are used to pressurize the upper mounting plate 1, lower mounting plate 3, upper open preformed block 2, and lower open preformed block 4.

[0071] Obviously, the above-disclosed embodiments of the present invention are merely illustrative of the invention. The embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. It is neither necessary nor possible to exhaustively list all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A molding die for a composite material frame structure with a mesh-like opening, characterized in that, include: A molding assembly includes an upper mounting plate (1), a plurality of upper-opening preformed blocks (2), a lower mounting plate (3), and a plurality of lower-opening preformed blocks (4). The plurality of upper-opening preformed blocks (2) can all be mounted on the upper mounting plate (1), and the upper-opening preformed blocks (2) are configured such that their four sides can be covered with prepreg. The plurality of lower-opening preformed blocks (4) can all be mounted on the lower mounting plate (3). The lower-opening preformed blocks (4) are configured such that their four sides can be covered with prepreg. The lower mounting plate (3) and the upper mounting plate (1) are detachably connected. When the lower mounting plate (3) and the upper mounting plate (1) are connected, the upper-opening preformed blocks (2) and the lower-opening preformed blocks (4) are located between the lower mounting plate (3) and the upper mounting plate (1), and prepreg can be laid between the upper-opening preformed blocks (2) and the lower-opening preformed blocks (4). A pressurizing assembly for pressurizing a molded assembly that has been laid or covered with prepreg; The pressurizing assembly includes an upper pressurizing plate (7) and a middle pressurizing plate (8). The upper mounting plate (1) is provided with an avoidance opening. The upper pressurizing plate (7) includes a first abutting part and a second abutting part fixedly disposed. The first abutting part can abut against the top of the upper mounting plate (1). The second abutting part passes through the avoidance opening and abuts against the middle pressurizing plate (8). The middle pressurizing plate (8) is located between the upper mounting plate (1) and the lower opening preformed block (4). The middle pressurizing plate (8) can abut against the prepreg laid between the upper opening preformed block (2) and the lower opening preformed block (4).

2. The molding die for the composite material frame structure with a mesh-like opening according to claim 1, characterized in that: The pressurizing assembly includes multiple external pressurizing seats (5), multiple pressurizing bolts, and multiple side pressurizing plates (6). The multiple external pressurizing seats (5) are all fixedly installed on the lower mounting plate (3). The multiple external pressurizing seats (5) are spaced apart. Each external pressurizing seat (5) is screwed to at least one pressurizing bolt. The pressurizing bolt can abut against the side pressurizing plate (6) so that the side pressurizing plate (6) abuts against the prepreg covering the upper open preformed block (2) and / or the lower open preformed block (4).

3. The molding die for the composite material frame structure with a mesh-like opening according to claim 1, characterized in that: The upper mounting plate (1) is fixedly provided with a connecting protrusion (11), and the lower mounting plate (3) is provided with a connecting groove (31). The connecting protrusion (11) can be engaged with the connecting groove (31).

4. The molding die for the composite material frame structure with a mesh-like opening according to claim 1, characterized in that: It also includes a first fixing bolt, through which the upper mounting plate (1) and the upper open preformed block (2) are fixedly connected.

5. The molding die for the composite material frame structure with a mesh-like opening according to claim 1, characterized in that: It also includes a first positioning pin. The upper mounting plate (1) and the upper open preformed block (2) are both provided with a first positioning hole. The first positioning pin passes through the first positioning hole of the upper mounting plate (1) and the upper open preformed block (2).

6. The molding die for the composite material frame structure with a mesh-like opening according to claim 1, characterized in that: It also includes a second fixing bolt, through which the lower mounting plate (3) and the lower opening preformed block (4) are fixedly connected.

7. The molding die for the composite material frame structure with a mesh-like opening according to claim 1, characterized in that: It also includes a second positioning pin. The lower mounting plate (3) and the lower opening preformed block (4) are both provided with a second positioning hole. The second positioning pin passes through the second positioning hole of the lower mounting plate (3) and the lower opening preformed block (4).

8. A method for molding a composite material frame structure with mesh-like openings, characterized in that, A molding die for a composite material frame structure with a mesh-like opening as described in any one of claims 1-7, comprising: S1: Cover each top-opening preform (2) with prepreg around its perimeter; cover each bottom-opening preform (4) with prepreg around its perimeter; S2: Install multiple preformed blocks (2) with upper openings onto the upper mounting plate (1); S3: Install multiple preformed blocks (4) with lower openings onto the lower mounting plate (3), and clamp the edge of a prepreg between the lower mounting plate (3) and the preformed blocks (4), with the remaining part of the prepreg being the prepreg to be used; S4: Turn the prepreg to be used over so that it covers one side of the lower opening preform (4) and then lay it on top of the lower opening preform (4); S5: Connect the upper mounting plate (1) to the lower mounting plate (3) and make the upper open preformed block (2) contact the prepreg to be used; S6: Pressurize the upper mounting plate (1), lower mounting plate (3), upper open preformed block (2) and lower open preformed block (4) using a pressurizing assembly.

9. The molding method for a composite material frame structure with mesh-like openings according to claim 8, characterized in that: Between S1 and S2, there is also: The air bubbles between the prepreg covering the upper open preform (2) and the upper open preform (2) are removed by vacuum pre-pressing, and the air bubbles between the prepreg covering the lower open preform (4) and the lower open preform (4) are removed.

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