Forming die and method for composite material frame structure with latticed openings

Abstract

The invention provides a forming mold and method for a composite material frame structure with latticed openings, and belongs to the technical field of forming of composite material structures. In the forming mold of the composite material frame structure with the latticed openings, a plurality of upper opening pre-forming blocks can be mounted on an upper mounting plate, and the peripheries of the upper opening pre-forming blocks can be coated with prepreg; a plurality of lower opening pre-forming blocks can be mounted on the lower mounting plate; the periphery of the lower opening pre-forming block can be coated with prepreg; when the lower mounting plate is connected with the upper mounting plate, the upper opening preforming block and the lower opening preforming block are located between the lower mounting plate and the upper mounting plate, prepreg can be laid between the upper opening preforming block and the lower opening preforming block, and the pressurizing assembly is used for pressurizing the forming assembly for laying or wrapping the prepreg. The integrated forming co-curing and demolding of the composite material frame structure with the latticed opening can be realized, and the mechanical property advantages of the carbon fiber composite material can be better played.

Description

Technical Field

[0001] The invention belongs to the technical field of forming composite material structures, and in particular relates to a forming die and a forming method of a composite material frame structure with grid-shaped openings. Background Art

[0002] Carbon fiber composite products have been widely used in various fields such as aerospace, including but not limited to civil, military and commercial purposes. Its light weight and high strength characteristics have become synonymous with its own advantages. It can be used in various main load-bearing structures such as spacecraft. At the same time, carbon fiber composite structures have strong designability and are gradually replacing a variety of traditional metal materials, occupying the market position of various forms of structural parts.

[0003] The carbon fiber composite material frame with a double-layer grid-like opening structure has the advantages of high strength and vibration resistance. The one-piece carbon fiber composite material frame with a double-layer grid-like opening structure can greatly avoid the generation of redundant materials, improve the quality of the product, reduce the weight deviation caused by gluing redundant structural parts, and ensure the continuity of the fiber. The double-layer grid-like opening structure means that the upper and lower sides must be opened at the same time during the molding process, and the molding is synchronized. After one-time curing and demolding, the middle flat plate structure and the upper and lower two-layer grid-like opening structure are integrally molded. The mold is used to ensure the structural form and accuracy of the product, minimize the gluing and screwing between parts, reduce the difficulty of mechanical processing and assembly, ensure the flatness and surface accuracy of the product surface, help meet the structural requirements of the frame, improve the designability of the product, and provide convenience for its later loading of products. However, there is currently no molding mold and method that can form a carbon fiber composite material frame with a double-layer grid-like opening structure in one step. Summary of the invention

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

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A forming die of a composite material frame structure having a grid-shaped opening, comprising:

[0007] A molding assembly, the molding assembly comprising an upper mounting plate, a plurality of upper opening pre-molded blocks, a lower mounting plate, a plurality of lower opening pre-molded blocks, the plurality of upper opening pre-molded blocks can all be mounted on the upper mounting plate, the upper opening pre-molded blocks are configured so that they can be covered with prepreg on all sides; the plurality of lower opening pre-molded blocks can all be mounted on the lower mounting plate; the lower opening pre-molded blocks are configured so that they can be covered with prepreg on all sides; 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 pre-molded blocks and the lower opening pre-molded blocks are located between the lower mounting plate and the upper mounting plate, and prepreg can be laid between the upper opening pre-molded blocks and the lower opening pre-molded blocks;

[0008] A pressurizing component is used to pressurize a molding component on which prepreg is laid or coated.

[0009] As a preferred solution of the forming mold of the above-mentioned composite material frame structure with grid-shaped openings, the pressure assembly includes multiple external pressure seats, multiple pressure bolts and multiple side pressure plates, and the multiple external pressure seats are fixedly arranged on the lower mounting plate, and the multiple external pressure seats are arranged at intervals. Each of the external pressure seats is screwed with at least one pressure bolt, and the pressure bolt can abut against the side pressure plate to make the side pressure plate tightly abut against the prepreg covered on the upper opening preformed block and / or the lower opening preformed block.

[0010] As a preferred solution of the forming mold of the above-mentioned composite material frame structure with grid-shaped openings, the pressurizing assembly includes an upper pressurizing plate and a middle pressurizing plate, the upper mounting plate is provided with an avoidance opening, the upper pressurizing plate includes a first abutting portion and a second abutting portion fixedly arranged, the first abutting portion can abut against the top of the upper mounting plate, the second abutting portion passes through the avoidance 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 solution of the molding die of the composite material frame structure with grid-shaped openings, the upper mounting plate is fixedly provided with a connecting protrusion, and the lower mounting plate is provided with a connecting groove, and the connecting protrusion can be snapped into the connecting groove.

[0012] As a preferred solution of the above-mentioned forming mold of the composite material frame structure with grid-like openings, the forming mold of the composite material frame structure with grid-like openings also 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 solution of the above-mentioned forming mold of the composite material frame structure with grid-shaped openings, the forming mold of the composite material frame structure with grid-shaped openings also includes a first positioning pin, and the upper mounting plate and the upper opening preformed block are both provided with a first positioning hole, and the first positioning pin is passed through the first positioning holes of the upper mounting plate and the upper opening preformed block.

[0014] As a preferred solution of the above-mentioned forming mold of the composite material frame structure with grid-like openings, the forming mold of the composite material frame structure with grid-like openings also includes a second fixing bolt, and the lower mounting plate and the lower opening preformed block are fixedly connected by the second fixing bolt.

[0015] As a preferred solution of the above-mentioned forming mold of the composite material frame structure with grid-shaped openings, the forming mold of the composite material frame structure with grid-shaped openings also includes a second positioning pin, and the lower mounting plate and the lower opening preformed block are both provided with a second positioning hole, and the second positioning pin is passed through the second positioning holes of the lower mounting plate and the lower opening preformed block.

[0016] A method for forming a composite material frame structure with grid-shaped openings, using the above-mentioned forming mold for the composite material frame structure with grid-shaped openings, comprising:

[0017] S1: Wrap each upper opening preformed block with prepreg on all sides; wrap each lower opening preformed block with prepreg on all sides;

[0018] S2: installing a plurality of upper opening preformed blocks on an upper mounting plate;

[0019] S3: installing a plurality of lower opening preformed blocks on a lower mounting plate, and sandwiching an edge of a prepreg between the lower mounting plate and the lower opening preformed block, and the rest of the prepreg is a stand-by prepreg;

[0020] S4: turning over the prepreg to be used so that it covers one side of the lower opening preformed block and then is laid on the upper surface of the lower opening preformed block;

[0021] S5: connecting the upper mounting plate to the lower mounting plate, and making the upper opening preformed block contact with the prepreg to be used;

[0022] S6: Use a pressurizing assembly to pressurize the upper mounting plate, the lower mounting plate, the upper opening preformed block, and the lower opening preformed block.

[0023] As a preferred solution of the molding method of the composite material frame structure with grid-shaped openings, between S1 and S2, the following is further included:

[0024] By vacuum pre-pressing, the bubbles between the prepreg wrapped around the upper opening preformed block and the upper opening preformed block are exhausted, and the bubbles between the prepreg wrapped around the lower opening preformed block and the lower opening preformed block are exhausted.

[0025] Compared with the prior art, the molding die and method of a composite material frame structure with grid-shaped openings provided by the present invention have the following beneficial effects:

[0026] 1. The present invention provides a forming mold and method for a composite material frame structure with a grid-like opening. The forming mold for the composite material frame structure with a grid-like opening is used to form the composite material frame structure with a grid-like opening in one step. The composite material frame structure with a grid-like opening includes a middle plate and two grid-like opening structures located on the upper and lower sides of the middle plate, respectively. There is no other metal material connection, and both are composite material structures, which are fixedly connected by integral molding. The grid-like opening structures on the upper and lower sides can be symmetrical structures or asymmetrical structures. When the forming mold for the composite material frame structure with a grid-like opening is used for molding, each upper opening preformed block and each lower opening preformed block are coated with prepreg all around, and then the upper opening preformed block coated with prepreg is installed on the upper mounting plate, and the lower opening preformed block coated with prepreg is installed on the lower mounting plate. Before installation, the edge of a prepreg needs to be clamped between the lower opening preformed block and the lower mounting plate. The rest of the prepreg is a stand-by prepreg, which is a prepreg reserved for standby use along the fiber length direction. After installing the lower opening preformed block, flip the stand-by prepreg to bypass one side of the lower opening preformed block and flip it to the top of the lower opening preformed block, that is, flip it to the side of the lower opening preformed block away from the lower mounting plate, and then connect the upper mounting plate and the lower mounting plate. At this time, the upper opening preformed block and the lower opening preformed block are both located between the upper mounting plate and the lower mounting plate, and the flipped stand-by prepreg is located between the upper opening preformed block and the lower opening preformed block and contacts each other. Finally, a pressurizing component is used to pressurize the installed molding component in the up and down directions and all around directions.

[0027] 2. The present invention provides a forming mold and method for a composite material frame structure with a grid-like opening. The forming mold for the composite material frame structure with a grid-like opening is to install an upper opening preformed block coated with a certain thickness of prepreg on an upper mounting plate, and to form an upper grid-like opening structure by splicing a plurality of upper opening preformed blocks; to install a lower opening preformed block coated with a certain thickness of prepreg on a lower mounting plate, and to form a lower grid-like opening structure by splicing a plurality of lower opening preformed blocks; the prepreg laid between the upper opening preformed block and the lower opening preformed block will be connected with the prepreg coated around the upper opening preformed block and the prepreg coated around the lower opening preformed block after forming, thereby obtaining an integrally formed composite material frame structure with a grid-like opening. The integrally formed co-curing and demoulding of the composite material frame structure with a grid-like opening can be smoothly realized, and the mechanical performance advantages of carbon fiber composite materials can be better exerted.

[0028] 3. The present invention provides a molding die and method for a composite material frame structure with a grid-like opening. In the molding die for a composite material frame structure with a grid-like opening, the size and shape of the upper opening pre-molding block and the lower opening pre-molding block can be designed according to the adaptability of the product to be prepared. Compared with traditional molding die, it is completely unrestricted and easy to demold. Metal core molds can be used for pre-molding, and non-metal molds can also be used for pre-molding, such as PMI foam or sand core molds. However, for openings that are too small, non-metal molds must be used. Therefore, the molding die for a composite material frame structure with a grid-like opening can mold products of various sizes, thicknesses, various shapes, and complex cavity structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 is an exploded schematic diagram of a forming die of a composite material frame structure with grid-shaped openings provided in a specific embodiment of the present invention;

[0031] Figure 2 It is a structural schematic diagram of an upper mounting plate of a forming die having a composite material frame structure with grid-shaped openings provided by a specific embodiment of the present invention;

[0032] Figure 3 It is an assembly diagram of an upper mounting plate and an upper opening preformed block of a forming die of a composite material frame structure with a grid-shaped opening provided by a specific embodiment of the present invention;

[0033] Figure 4It is an assembly diagram of a lower mounting plate and a lower opening preformed block of a forming die of a composite material frame structure with a grid-shaped opening provided by a specific embodiment of the present invention;

[0034] Figure 5 It is a structural schematic diagram of a product prepared by using a molding die having a composite material frame structure with grid-like openings provided by a specific embodiment of the present invention.

[0035] In the figure:

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

[0037] 2. Upper opening preformed block;

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

[0039] 4. Lower opening preformed block;

[0040] 5. External pressure seat;

[0041] 6. Side pressure plate;

[0042] 7. Upper pressure plate;

[0043] 8. Middle pressure plate;

[0044] 100. upper grid-like opening structure; 200. lower grid-like opening structure; 300. middle flat plate. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, the terms "upper", "lower", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0049] See also Figure 1-5 Description of this embodiment. The present invention provides a molding die and method for a composite material frame structure with a grid-like opening. The molding die for a composite material frame structure with a grid-like opening comprises a molding component and a pressurizing component. The molding component comprises 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 so that they can be covered with prepreg on all sides; 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 so that they can be covered with prepreg on all sides; 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 on which the prepreg is laid or covered.

[0050] The forming mold of the composite material frame structure with grid-shaped openings is used to form the composite material frame structure with grid-shaped openings in one step. The composite material frame structure with grid-shaped openings includes a middle plate 300 and an upper grid-shaped opening structure 100 and a lower grid-shaped opening structure 200 located on the upper and lower sides of the middle plate 300, respectively. There is no other metal material connection, and both are composite material structures, which are fixedly connected by integral molding. The upper grid-shaped opening structure 100 and the lower grid-shaped opening structure 200 can be symmetrical structures or asymmetrical structures. When the forming mold of the composite frame structure with a grid-shaped opening is used for forming, each upper opening preformed block 2 and each lower opening preformed block 4 are coated with prepreg, and then the upper opening preformed block 2 coated with prepreg is installed on the upper mounting plate 1, and the lower opening preformed block 4 coated with prepreg is installed on the lower mounting plate 3. Before installation, the edge of a prepreg needs to be clamped between the lower opening preformed block 4 and the lower mounting plate 3, and the rest of the prepreg is the stand-by prepreg, which is the stand-by prepreg reserved for standby along the length direction of the fiber. After the opening preforming block 4, the stand-by prepreg is flipped over to bypass one side of the lower opening preforming block 4 and flipped over to the top of the lower opening preforming block 4, that is, flipped to the side of the lower opening preforming block 4 away from the lower mounting plate 3, and then the upper mounting plate 1 and the lower mounting plate 3 are connected. At this time, the upper opening preforming block 2 and the lower opening preforming block 4 are both located between the upper mounting plate 1 and the lower mounting plate 3, and the flipped stand-by prepreg is located between the upper opening preforming block 2 and the lower opening preforming block 4 and contacts each other. Finally, the installed molding assembly is pressurized in the up and down directions and all around directions with a pressurizing assembly.

[0051] The forming mold of the composite frame structure with grid-shaped openings is to install the upper opening preformed block 2 coated with a certain thickness of prepreg on the upper mounting plate 1, and form an upper grid-shaped opening structure 100 by splicing multiple upper opening preformed blocks 2; install the lower opening preformed block 4 coated with a certain thickness of prepreg on the lower mounting plate 3, and form a lower grid-shaped opening structure 200 by splicing multiple lower opening preformed blocks 4; the prepreg laid between the upper opening preformed block 2 and the lower opening preformed block 4 will be connected with the prepreg coated around the upper opening preformed block 2 and the prepreg coated around the lower opening preformed block 4 after forming, so as to obtain an integrally formed composite frame structure with grid-shaped openings. The integrally formed co-curing and demoulding of the composite frame structure with grid-shaped openings can be smoothly realized, and the mechanical performance advantages of carbon fiber composite materials can be better exerted.

[0052] Among them, by coating the prepreg on the upper opening preformed block 2 and the lower opening preformed block 4, the grid thickness of the product to be prepared is symmetrically and equally distributed, and the formation of the grid-shaped opening structure is completed by splicing multiple upper opening preformed blocks 2 and splicing multiple lower opening preformed blocks 4. The forming thickness depends on the thickness of the product grid ribs. Generally, half of the thickness of the grid ribs is evenly distributed to two adjacent upper opening preformed blocks 2 or lower opening preformed blocks 4. The thickness of the prepreg laid between the upper preformed block and the lower preformed block depends on the thickness of the middle plate 300 of the product to be prepared.

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

[0054] Preferably, the pressurizing assembly includes a plurality of external pressurizing seats 5, a plurality of pressurizing bolts and a plurality of side pressurizing plates 6. The plurality of external pressurizing seats 5 are fixedly arranged on the lower mounting plate 3. The plurality of external pressurizing seats 5 are arranged at intervals. Each external pressurizing seat 5 is screwed with at least one pressurizing bolt. The pressurizing bolt can abut against the side pressurizing plate 6 so that the side pressurizing plate 6 and the prepreg coated on the upper opening preformed block 2 and / or the lower opening preformed block 4 are pressed tightly. The external pressurizing seat 5 is fixed at the edge of the lower mounting plate 3. After the pressurizing bolt is screwed with the external pressurizing seat 5, it can be understood that at this time, the nut of the pressurizing bolt does not abut against the external pressurizing seat 5, and the end of the pressurizing bolt abuts against the side pressurizing plate 6. The pressurizing bolt is continuously rotated so that the pressurizing bolt pushes the side pressurizing plate 6 to abut against the upper opening preformed block 2 and / or the lower opening preformed block 4. The number and shape of the side pressurizing plates 6 can be designed according to the shape adaptability of the product to be prepared.

[0055] Preferably, 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 portion and a second abutting portion which are fixedly arranged. The first abutting portion can abut against the upper surface of the upper mounting plate 1. The second abutting portion is provided with an 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. The middle pressurizing plate 8 is used to compress the prepreg laid between the upper opening preformed block 2 and the lower opening preformed block 4. The upper pressurizing plate 7 is used to compress the middle pressurizing plate 8 and the upper mounting plate 1. The press can perform compression and mold clamping in the upper and lower positions by pressing on the upper pressurizing plate 7. In order to prevent the product from deforming or rebounding after the press is pressurized, the product needs to be cured on the press to ensure the mold clamping 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 snapped into the connecting groove 31. After the connecting protrusion 11 can be snapped into the connecting groove 31, the positions of the upper mounting plate 1 and the lower mounting plate 3 can be positioned, and the upper mounting plate 1 and the lower mounting plate 3 can be connected, which can ensure that the double-layer grid-shaped opening structure of the prepared product does not have an inter-layer offset phenomenon.

[0057] In this embodiment, the connection protrusion 11 and the connection groove 31 are respectively arranged at the edges of the upper mounting plate 1 and the lower mounting plate 3. The design of the connection protrusion 11 and the connection groove 31 can prevent the upper and lower layers of the grid-like opening structure of the prepared product from being misaligned, play a role in locating the relative positions of the upper and lower layers of the grid-like opening structure, and ensure the accuracy of the correspondence between the upper and lower layers of the grid-like opening structure.

[0058] Preferably, the forming mold of the composite material frame structure with grid-shaped openings further includes a first positioning pin, and the upper mounting plate 1 and the upper opening preformed block 2 are both provided with a first positioning hole, and the first positioning pin is passed through the first positioning holes of the upper mounting plate 1 and the upper opening preformed block 2. The upper mounting plate 1 and the upper opening preformed block 2 are positioned by the first positioning pin, which can ensure the accuracy and outline size of the upper grid-shaped opening structure 100 of the prepared product.

[0059] Preferably, the forming mold of the composite material frame structure with grid-shaped openings 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 upper opening preformed block 2 is positioned by the first positioning pin, it is fixed by the first fixing bolt.

[0060] Preferably, the forming mold of the composite material frame structure with grid-shaped openings further includes a second positioning pin, and the lower mounting plate 3 and the lower opening preformed block 4 are both provided with a second positioning hole, and the second positioning pin is passed 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, which can ensure the accuracy and outline size of the lower grid-shaped opening structure 200 of the prepared product.

[0061] Preferably, the forming mold of the composite material frame structure with grid-shaped openings 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 lower opening preformed block 4 is positioned by the second positioning pin, it is fixed by the second fixing bolt.

[0062] The present invention also provides a method for forming a composite material frame structure with grid-shaped openings, using the above-mentioned forming mold of the composite material frame structure with grid-shaped openings, comprising:

[0063] S1: Wrap each upper opening preformed block 2 with prepreg on all sides; wrap each lower opening preformed block 4 with prepreg on all sides.

[0064] After forming, the upper opening preformed block and the lower opening preformed block 4 which are covered with prepreg on all sides are easy to demould, and the remaining prepreg will form a grid-like opening structure.

[0065] The air bubbles between the prepreg wrapped around the upper opening preformed block 2 and the upper opening preformed block 2 are completely discharged by vacuum prepressing, and the air bubbles between the prepreg wrapped around the lower opening preformed block 4 and the lower opening preformed block 4 are completely discharged. The laying quality and cavity thickness can be guaranteed, laying a foundation for the subsequent splicing and inlaying of the upper opening preformed block 2 and the lower opening preformed block 4.

[0066] S2: Install a plurality of upper opening preformed blocks 2 on the upper mounting plate 1 .

[0067] S3: multiple lower opening preformed blocks 4 are mounted on the lower mounting plate 3, and the edge of a prepreg is sandwiched between the lower mounting plate 3 and the lower opening preformed block 4, and the rest of the prepreg is the standby prepreg. The standby prepreg is the prepreg reserved for use along the fiber length direction.

[0068] S4: Flip the prepreg to be used so that it covers one side of the lower opening preformed block 4 and is laid on the lower opening preformed block 4. That is, it is finally laid on the side of the lower opening preformed block 4 away from the lower mounting plate 3. This part of the prepreg will be between the upper opening preformed block 2 and the lower opening preformed block 4, and will form a middle plane after molding.

[0069] S5: Connect the upper mounting plate 1 with the lower mounting plate 3, and make the upper opening preformed block 2 contact the prepreg to be used. At this time, the upper mounting plate 1, the upper opening preformed block 2, the prepreg to be used, the lower opening preformed block 4 and the lower mounting plate 3 are arranged in sequence from top to bottom. The prepreg to be used can connect the prepreg wrapped around the upper opening preformed block 2 and the prepreg wrapped around the lower opening preformed block 4.

[0070] S6: Use a pressurizing assembly to pressurize the upper mounting plate 1 , the lower mounting plate 3 , the upper opening preformed block 2 and the lower opening preformed block 4 .

[0071] Obviously, the embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that technicians in the relevant technical field can understand and use the present invention well. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A forming die of a composite material frame structure having a grid-shaped opening, characterized in that: include: A molding assembly, the molding assembly comprising an upper mounting plate (1), a plurality of upper opening pre-molded blocks (2), a lower mounting plate (3) and a plurality of lower opening pre-molded blocks (4); the plurality of upper opening pre-molded blocks (2) can all be mounted on the upper mounting plate (1), the upper opening pre-molded blocks (2) are configured so that they can be covered with prepreg on all sides; the plurality of lower opening pre-molded blocks (4) can all be mounted on the lower mounting plate (3); the lower opening pre-molded blocks (4) are configured so that they can be covered with prepreg on all sides; 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 pre-molded blocks (2) and the lower opening pre-molded 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 pre-molded blocks (2) and the lower opening pre-molded blocks (4); A pressurizing component is used to pressurize a molding component on which prepreg is laid or coated.

2. The forming die of the composite material frame structure with grid-shaped openings according to claim 1, characterized in that: The pressurizing assembly comprises a plurality of external pressurizing seats (5), a plurality of pressurizing bolts and a plurality of side pressurizing plates (6); the plurality of external pressurizing seats (5) are fixedly arranged on the lower mounting plate (3); the plurality of external pressurizing seats (5) are arranged at intervals; 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) is tightly abutted against the prepreg coated on the upper opening preformed block (2) and / or the lower opening preformed block (4).

3. The forming die of the composite material frame structure with grid-shaped openings according to claim 1, characterized in that: The pressurizing assembly comprises 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) comprises a first abutting portion and a second abutting portion which are fixedly arranged; the first abutting portion can abut against the upper surface of the upper mounting plate (1); the second abutting portion is passed 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).

4. The forming die of the composite material frame structure with grid-shaped openings 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), and the connecting protrusion (11) can be snap-connected to the connecting groove (31).

5. The forming die of the composite material frame structure with grid-shaped openings according to claim 1, characterized in that: It also comprises a first fixing bolt, and the upper mounting plate (1) and the upper opening preformed block (2) are fixedly connected via the first fixing bolt.

6. The forming die of the composite material frame structure with grid-shaped openings according to claim 1, characterized in that: It also comprises a first positioning pin, the upper mounting plate (1) and the upper opening preformed block (2) are both provided with a first positioning hole, and the first positioning pin is passed through the first positioning holes of the upper mounting plate (1) and the upper opening preformed block (2).

7. The forming die of the composite material frame structure with grid-shaped openings according to claim 1, characterized in that: It also comprises a second fixing bolt, and the lower mounting plate (3) and the lower opening preformed block (4) are fixedly connected via the second fixing bolt.

8. The forming die of the composite material frame structure with grid-shaped openings 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, and the second positioning pin is passed through the second positioning holes of the lower mounting plate (3) and the lower opening preformed block (4).

9. A method for forming a composite material frame structure having a grid-like opening, characterized in that: A forming die of a composite material frame structure with a grid-shaped opening according to any one of claims 1 to 8, comprising: S1: Wrap each upper opening preformed block (2) with prepreg on all sides; wrap each lower opening preformed block (4) with prepreg on all sides; S2: installing a plurality of upper opening preformed blocks (2) on the upper mounting plate (1); S3: installing a plurality of lower opening preformed blocks (4) on the lower mounting plate (3), and clamping the edge of a prepreg between the lower mounting plate (3) and the lower opening preformed block (4), the rest of the prepreg being a stand-by prepreg; S4: turning over the prepreg to be used so that it covers one side of the lower opening preformed block (4) and then is laid on the upper surface of the lower opening preformed block (4); S5: connecting the upper mounting plate (1) to the lower mounting plate (3), and making the upper opening preformed block (2) contact with the prepreg to be used; S6: using a pressurizing assembly to pressurize the upper mounting plate (1), the lower mounting plate (3), the upper opening preformed block (2) and the lower opening preformed block (4).

10. The method for forming a composite material frame structure with grid-shaped openings according to claim 9, characterized in that: Also included between S1 and S2: By adopting a vacuum pre-pressing method, the bubbles between the prepreg wrapped around the upper opening preformed block (2) and the upper opening preformed block (2) are completely discharged, and the bubbles between the prepreg wrapped around the lower opening preformed block (4) and the lower opening preformed block (4) are completely discharged.

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