Molding die and molding method for a composite article of A-shaped reinforcing rib

Abstract

The embodiment of the application provides a forming die and a forming method of an A-shaped reinforcing rib composite part, relates to the technical field of composite material forming, and the forming die comprises an A-shaped frame forming die, a triangular soft film forming die and a built-in pressure bag; the triangular soft film forming die comprises a first upper die and a first lower die which are relatively symmetrical, the built-in pressure bag is used for cooperating with the first upper die and the first lower die to generate the triangular soft film, and is used for cooperating with the triangular soft film and the A-shaped frame forming die to generate the A-shaped reinforcing rib composite part; the A-shaped frame forming die comprises a second upper die and a left die and a right die which are relatively symmetrical, and the second upper die, the left die and the right die are used for cooperating with the triangular soft film and the built-in pressure bag to generate the A-shaped reinforcing rib composite part. The embodiment of the application can realize the integral forming of the A-shaped reinforcing rib composite part, and the A-shaped reinforcing rib composite part is good in internal and surface quality.

Description

Technical Field

[0001] This invention relates to the field of composite material molding technology, specifically to molding dies and molding methods for A-shaped reinforcing rib composite material parts. Background Technology

[0002] Composite materials are new materials created by optimizing the combination of material components with different properties using advanced material preparation technologies. Due to their excellent performance, they are widely used in cutting-edge technology fields such as aerospace, bringing significant weight reduction benefits. With designers placing greater emphasis on reducing the overall weight of aircraft and the development and advancement of composite material molding processes, the application of composite materials in aircraft has gradually transitioned from simple small-sized parts such as skins, beams, ribs, and stringers to main load-bearing components such as beams and ribs that play a supporting and load-bearing role, such as critical components like wings, vertical tails, and center wing boxes. Composite material stiffened structures are widely used in the design of main load-bearing components due to their excellent bending and shear resistance and good load-bearing capacity.

[0003] Traditional reinforcing rib structures include Z-shaped, I-shaped, square, and triangular structures, primarily serving to enhance the rigidity of the skin and applied in the structures of various products. A-shaped reinforcing ribs not only provide reinforcement but also offer other functional requirements, such as providing wiring passage for transmission systems and protecting cables. Currently, the molding dies for A-shaped reinforcing rib composite parts cannot meet the requirements for one-piece molding. Furthermore, the core mold uses silicone rubber, and the expansion of silicone rubber is difficult to control, resulting in poor internal and surface quality of the manufactured parts. Additionally, the limited pressure provided by the autoclave during manufacturing makes it difficult to guarantee the quality of the finished parts. Summary of the Invention

[0004] The purpose of this invention is to provide a molding die and molding method for A-shaped reinforcing rib composite material parts, which can realize the one-piece molding of the A-shaped reinforcing rib composite material parts, and the resulting A-shaped reinforcing rib composite material parts have better internal and surface quality.

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

[0006] A molding die for an A-shaped reinforcing rib composite material part includes an A-shaped frame molding die, a triangular soft film molding die, and an internal pressure bag;

[0007] The triangular soft film forming mold includes a symmetrical first upper mold and a first lower mold. The built-in pressure bag is used to cooperate with the first upper mold and the first lower mold to generate a triangular soft film, and to cooperate with the triangular soft film and the A-shaped frame forming mold to generate an A-shaped reinforcing rib composite material part.

[0008] The A-shaped frame forming mold includes a second upper mold and symmetrical left and right molds. The second upper mold, left mold and right mold are used to cooperate with the triangular soft film and the built-in pressure bag to generate the A-shaped reinforcing rib composite material part.

[0009] Furthermore, the triangular soft film forming mold also includes a first positioning pin;

[0010] The first upper mold is provided with a first positioning through hole, and the first lower mold is provided with a second positioning through hole. When the first upper mold and the first lower mold are assembled, the first positioning through hole and the second positioning through hole are interconnected and located on the same straight line. The first positioning pin is used to position the first upper mold and the first lower mold by passing through the first positioning through hole and the second positioning through hole.

[0011] Furthermore, the A-shaped frame forming mold also includes a second positioning pin;

[0012] The lower part of the left mold is provided with a third positioning through hole, and the lower part of the right mold is provided with a fourth positioning through hole. When the left mold and the right mold are assembled, the third positioning through hole and the fourth positioning through hole are interconnected and located on the same straight line. The second positioning pin is used to position the left mold and the right mold by passing through the third positioning through hole and the fourth positioning through hole.

[0013] Furthermore, the A-shaped frame forming mold also includes a locking component;

[0014] The lower part of the left mold is provided with a first threaded through hole, and the lower part of the right mold is provided with a second threaded through hole. When the left mold and the right mold are assembled, the first threaded through hole and the second threaded through hole are interconnected and located on the same straight line. The locking member is used to lock the left mold and the right mold through the first threaded through hole and the second threaded through hole.

[0015] Furthermore, the A-shaped frame forming mold also includes a third positioning pin and a fourth positioning pin;

[0016] The top surfaces of the left mold and the right mold are respectively provided with a fifth positioning through hole and a sixth positioning through hole. The second upper mold is provided with a seventh positioning through hole and an eighth positioning through hole. When the second upper mold is assembled to the assembled left mold and the right mold, the seventh positioning through hole and the fifth positioning through hole are interconnected and located on the same straight line, and the eighth positioning through hole and the sixth positioning through hole are interconnected and located on the same straight line. The third positioning pin is used to position the second upper mold and the left mold by passing through the seventh positioning through hole and the fifth positioning through hole, and the fourth positioning pin is used to position the second upper mold and the right mold by passing through the eighth positioning through hole and the sixth positioning through hole.

[0017] Furthermore, the first, second, third, and fourth positioning pins are all internally threaded cylindrical pins, the locking element is a hexagonal cylindrical head screw, and the mold material of the A-frame forming mold is one of P20 or mold steel.

[0018] A molding method for an A-shaped reinforcing rib composite material part, used in a molding die for the A-shaped reinforcing rib composite material part, includes the following steps:

[0019] S1, prepreg is applied to the first upper mold and the first lower mold of the triangular soft film forming mold for layup. After layup, the first upper mold and the first lower mold are positioned and assembled. After assembly, the built-in pressure bag is placed in the middle cavity of the triangular soft film forming mold. Then, the triangular soft film forming mold is placed on the press platform, and pressure is injected into the built-in pressure bag. After sufficient pressure is injected, the layup on the first upper mold and the first lower mold is cured to obtain a rough triangular soft film. The rough triangular soft film is trimmed to obtain a triangular soft film.

[0020] S2, prepreg is laid on all three sides of the triangular soft film to complete the first layup group; prepreg is laid on the left mold of the A-frame forming mold to complete the second layup group; prepreg is laid on the second upper mold of the A-frame forming mold to complete the third layup group; the triangular soft film with prepreg laid on it is placed on the left mold for positioning; then the prepreg laid on the left mold is folded to the other side, and the right mold is assembled so that the folded prepreg is laid on the right mold; finally, the left mold and the right mold are assembled, positioned and locked.

[0021] S3. A twist strip is manufactured using a twist strip tooling and filled into the A-shaped frame forming mold. After filling, a hot pre-press is performed. The hot pre-press temperature is set to 60-80℃, and the hot pre-press pressure is 0.3 mbar-0.6 mbar. After the hot pre-press is completed, the positions of the filled twist strips are repaired to obtain the twist strip filling layer.

[0022] S4, assemble the second upper mold with the prepreg laid on it onto the left mold and the right mold and position it. Then place the built-in pressure bag in the middle cavity of the mold of the A-shaped reinforcing rib composite material part that has been positioned. Next, place the mold of the A-shaped reinforcing rib composite material part on the press platform and pressurize the built-in pressure bag. Finally, complete the bag making, curing and demolding according to the process requirements to obtain the A-shaped reinforcing rib composite material part.

[0023] Further, in step S1, the layup of prepreg on the first upper mold and the first lower mold of the triangular soft film forming mold includes:

[0024] An Airpad rubber layer is laid on the first upper mold and the first lower mold of the triangular soft film forming mold, respectively. After laying the Airpad rubber layer, a plain fiberglass prepreg layer is laid on the Airpad rubber layer. Finally, an Airpad rubber layer is laid on the plain fiberglass prepreg layer.

[0025] Further, in step S1, placing the triangular soft film forming mold on the press platform and inflating the built-in pressure bag to a sufficient pressure includes:

[0026] Place the triangular soft film forming mold on the press platform, and connect the compressed air connector on the built-in pressure bag to the air compressor interface, and pressurize the built-in pressure bag with sufficient pressure through the air compressor.

[0027] Preferably, the filling pressure is 1-10 mbar.

[0028] Furthermore, the prepregs used in step S2 are all carbon fiber unidirectional prepregs.

[0029] Beneficial effects:

[0030] As can be seen from the above technical solutions,

[0031] The molding die for the A-shaped reinforcing rib composite material part in this solution includes an A-shaped frame molding die, a triangular soft film molding die, and a built-in pressure bag. By adding a built-in pressure bag to the die, stable and sufficient internal and external pressure is provided for the molding process of the part. This solves the problem of difficulty in ensuring part quality due to the limited pressure provided by the autoclave during preparation. It ensures sufficient pressure and smooth pressurization during the molding process, improving the internal and surface quality of the part, thereby improving the overall part quality. In addition, the molding die for the A-shaped reinforcing rib composite material part can directly produce the A-shaped reinforcing rib composite material part in one piece through the combination of the A-shaped frame molding die, the triangular soft film molding die, and the built-in pressure bag, eliminating the need for step-by-step preparation of the A-shaped reinforcing rib composite material part. This reduces production costs, shortens production speed, and improves production efficiency.

[0032] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered part of the inventive subject matter of this disclosure, provided that such concepts do not contradict each other.

[0033] The foregoing and other aspects, embodiments, and features of the teachings of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0034] The accompanying drawings are not drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0035] Figure 1 The layup diagram of the molding die for the A-shaped reinforcing rib composite material part provided in the embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of the A-shaped frame forming mold provided in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the triangular soft film forming mold provided in an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the filling pressure of the molding die provided in an embodiment of the present invention.

[0039] Explanation of icon numbers:

[0040] 1-A-shaped reinforcing rib composite material part; 2-First ply group; 3-Second ply group; 4-Third ply group; 5-Twisted strip filling layer; 6-Inner surface; 7-Outer surface; 8-Left mold; 9-Right mold; 10-Second upper mold; 11-Third positioning through hole; 12-Fourth positioning through hole; 13-First positioning threaded through hole; 14-Second threaded through hole; 15-Fifth positioning through hole; 16-Sixth positioning through hole; 17-Eighth positioning through hole; 18-Eighth positioning through hole; 19-First upper mold; 20-First lower mold; 21-First positioning through hole; 22-Second positioning through hole; 23-Triangular soft membrane; 24-Compressed air connector; 25-Built-in pressure bag. Detailed Implementation

[0041] 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0042] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0043] The molding die and molding method for the A-shaped reinforcing rib composite material parts disclosed in this invention will be further described in detail below with reference to the embodiments shown in the accompanying drawings.

[0044] This application provides a molding die for an A-shaped reinforcing rib composite material part, referencing... Figures 1 to 4 A molding die for A-shaped reinforcing rib composite material parts, the molding die includes an A-shaped frame molding die, a triangular soft film molding die and an internal pressure bag 24.

[0045] The triangular soft film forming mold includes a symmetrical first upper mold 19 and a first lower mold 20, with an internal pressure bag 24 for cooperating with the first upper mold 19 and the first lower mold 20 to generate a triangular soft film 23, and for cooperating with the triangular soft film 23 and the A-shaped frame forming mold to generate an A-shaped reinforcing rib composite material part 1.

[0046] like Figure 3As shown, prepreg is applied to the first upper mold 19 and the first lower mold 20 of the triangular soft film forming mold for layup. After layup, the first upper mold 19 and the first lower mold 20 are positioned and assembled to obtain the triangular soft film forming mold. The built-in pressure bag 24 is placed in the middle cavity of the triangular soft film forming mold. The triangular soft film forming mold is placed on the press platform, and the compressed air connector 25 on the built-in pressure bag 24 is connected to the air compressor interface. Pressure is injected into the built-in pressure bag 24 through the air compressor to cure the layup on the first upper mold 19 and the first lower mold 20, resulting in a rough triangular soft film part. The rough triangular soft film part is then trimmed to obtain the triangular soft film 23.

[0047] like Figure 2 As shown, a first layup group 2 is obtained by laying prepreg on a triangular soft film 23, a second layup group 3 is obtained by laying prepreg on a left mold 8, and a third layup group 4 is obtained by laying prepreg on a second upper mold 10. The triangular soft film 23 with prepreg laid is placed on the left mold 8 for positioning. Then, the prepreg on the left mold 8 is folded over, and the left mold 8 and the right mold 9 are assembled so that the folded prepreg fits into the right mold. The left mold 8 and the right mold 9 are positioned and locked. Then, the twist strips are filled, trimmed and processed to obtain the twist strip filling layer 5. After the layup is completed, it is sealed in a vacuum bag and placed in a thermostatic jar for hot pre-pressing. Finally, the laid second upper mold 10 is assembled onto the left mold 8 and the right mold 9 for positioning. Finally, the bag making, curing and demolding are completed according to the process requirements to obtain the A-shaped reinforcing rib composite material part 1.

[0048] When preparing A-shaped reinforcing rib composite material part 1 using the existing mold combined with autoclave molding method, the quality of A-shaped reinforcing rib composite material part 1 is difficult to guarantee due to the limited pressure provided by the autoclave during the molding process. Therefore, an internal pressure bag 24 is added so that the part can be provided with stable and sufficient pressure from the inside out through the internal pressure bag 24 during the molding process, ensuring that the part has sufficient pressure and smooth pressurization during the molding process.

[0049] Furthermore, the triangular soft film forming mold also includes a first positioning pin.

[0050] The contact surface between the first upper mold 19 and the first lower mold 20 is defined as a horizontal surface.

[0051] The first upper mold 19 has first positioning through holes 21 on both sides of its bottom surface, and the first lower mold 20 has second positioning through holes 22 on both sides of its top surface. When the first upper mold 19 and the first lower mold 20 are assembled, the first positioning through holes 21 and the second positioning through holes 22 are interconnected and located on the same straight line. The first positioning pin is used to position the first upper mold 19 and the first lower mold 20 by passing through the first positioning through holes 21 and the second positioning through holes 22.

[0052] like Figure 3 As shown, when the first upper mold 19 and the first lower mold 20 cooperate to make the triangular soft film 23, the first upper mold 19 and the first lower mold 20 are positioned by the first positioning pin passing through the first positioning through hole 21 and the second positioning through hole 22 during the part making process.

[0053] Furthermore, the A-frame forming mold also includes a second positioning pin.

[0054] The lower part of the left mold 8 is provided with a third positioning through hole 11, and the lower part of the right mold 9 is provided with a fourth positioning through hole 12. When the left mold 8 and the right mold 9 are assembled, the third positioning through hole 11 and the fourth positioning through hole 12 are interconnected and located on the same straight line. The second positioning pin is used to position the left mold 8 and the right mold 9 by passing through the third positioning through hole 11 and the fourth positioning through hole 12.

[0055] like Figure 2 As shown, when assembling the left mold 8 and the right mold 9, the third positioning through hole 11 and the fourth positioning through hole 12 are interconnected and located on the same straight line. At this time, the left mold 8 and the right mold 9 are positioned by the second positioning pin passing through the third positioning through hole 11 and the fourth positioning through hole 12.

[0056] Furthermore, the A-shaped frame forming mold also includes a locking component.

[0057] The lower part of the left mold 8 is provided with a first threaded through hole 13, and the lower part of the right mold 9 is provided with a second threaded through hole 14. When the left mold 8 and the right mold 9 are assembled, the first threaded through hole 13 and the second threaded through hole 14 are interconnected and located on the same straight line. The locking component is used to lock the left mold 8 and the right mold 9 through the first threaded through hole 13 and the second threaded through hole 14.

[0058] like Figure 2 As shown, a first threaded through hole 13 is provided below the third positioning through hole 11 of the left mold 8, and a second threaded through hole 14 is provided below the fourth positioning through hole 12 of the right mold 9. After the left mold 8 and the right mold 9 are positioned and assembled, the left mold 8 and the right mold 9 are locked by locking parts to prevent the mold assembly from loosening or falling off after positioning.

[0059] Furthermore, the A-shaped frame forming mold also includes a third positioning pin and a fourth positioning pin.

[0060] The top surfaces of the left mold 8 and the right mold 9 are respectively provided with a fifth positioning through hole 15 and a sixth positioning through hole 16. The second upper mold 10 is provided with a seventh positioning through hole 17 and an eighth positioning through hole 18. When the second upper mold 10 is assembled to the assembled left mold 8 and right mold 9, the seventh positioning through hole 17 and the fifth positioning through hole 15 are interconnected and located on the same straight line, and the eighth positioning through hole 18 and the sixth positioning through hole 16 are interconnected and located on the same straight line. The third positioning pin is used to position the second upper mold 10 and the left mold 8 by passing through the seventh positioning through hole 17 and the fifth positioning through hole 15, and the fourth positioning pin is used to position the second upper mold 10 and the right mold 9 by passing through the eighth positioning through hole 18 and the sixth positioning through hole 16 (e.g., ...). Figure 2 (As shown).

[0061] Furthermore, the first, second, third, and fourth locating pins are all internally threaded cylindrical pins, the locking element is a hexagonal cylindrical head screw, and the mold material of the A-frame forming mold is one of P20 or mold steel.

[0062] When preparing A-shaped reinforcing rib composite material parts 1 using existing silicone rubber molds, the expansion of silicone rubber is difficult to control during the molding process, resulting in poor internal and surface quality of the finished parts. Therefore, P20 mold steel is selected as the mold material, which has low deformation resistance and is easy to control in terms of quality. At the same time, the molding mold of this invention is a combination mold, which is divided into a triangular soft film molding mold and an A-shaped frame molding mold. The combination mold facilitates demolding and integral molding during the part making process. However, in the actual part making process, the autoclave cannot provide sufficient pressure, which makes it difficult to guarantee the quality of the A-shaped reinforcing rib composite material parts 1. Therefore, an internal pressure bag 24 is added so that the internal pressure bag 24 can provide stable and sufficient pressure from the inside to the outside during the part making process, ensuring sufficient pressure and smooth pressurization during the part making process.

[0063] This application also provides a molding method for an A-shaped reinforcing rib composite material part, used in the molding die for the A-shaped reinforcing rib composite material part described in any of the above embodiments. The method specifically includes the following steps:

[0064] S1, as Figure 3 , Figure 4 As shown, prepreg is applied to the first upper mold 19 and the first lower mold 20 of the triangular soft film forming mold for layup. After layup, the first upper mold 19 and the first lower mold 20 are positioned and assembled. After assembly, the built-in pressure bag 24 is placed in the middle cavity of the triangular soft film forming mold. Then, the triangular soft film forming mold is placed on the press platform, and pressure is injected into the built-in pressure bag 24. After sufficient pressure is injected, the layup on the first upper mold 19 and the first lower mold 20 is cured to obtain a rough triangular soft film part. The rough triangular soft film part is trimmed to obtain a triangular soft film 23.

[0065] S2, prepreg is laid on all three sides of the triangular soft film 23 to complete the first layup group 2; prepreg is laid on the left mold 8 of the A-frame forming mold to complete the second layup group 3; prepreg is laid on the second upper mold 10 of the A-frame forming mold to complete the third layup group 4; the triangular soft film 23 with prepreg laid on it is placed on the left mold 8 for positioning; then the prepreg laid on the left mold 8 is folded to the other side, and the right mold 9 is assembled so that the folded prepreg is laid on the right mold 9; finally, the left mold 8 and the right mold 9 are assembled, positioned and locked.

[0066] When laying the prepreg in the left mold 8, the prepreg is first cut to twice the length of the left mold 8. Half the length of the prepreg is laid on the left mold 8. After the soft film is placed, the remaining unlaid prepreg is folded over. Then the right mold 9 is assembled so that the folded prepreg is laid on the right mold 9.

[0067] S3, manufacture twist strips using twist strip tooling, and fill the twist strips into the A-shaped frame forming mold. After filling, perform hot pre-pressing. Set the hot pre-pressing temperature to 70℃ and the hot pre-pressing pressure to 0.4 mbar. After hot pre-pressing, repair the position of the filled twist strip to obtain the twist strip filling layer 5.

[0068] S4, assemble the second upper mold 10 with the prepreg laid on it onto the left mold 8 and the right mold 9 and position it. Then place the built-in pressure bag 24 into the middle cavity of the mold of the A-shaped reinforcing rib composite material part 1 that has been positioned. Next, place the mold of the A-shaped reinforcing rib composite material part 1 on the press platform and pressurize the built-in pressure bag 24. Finally, complete the bag making, curing and demolding according to the process requirements to obtain the A-shaped reinforcing rib composite material part 1.

[0069] like Figure 1 , Figure 2As shown, the A-shaped reinforcing rib composite material part 1 provided in this application consists of four ply groups: first ply group 2, second ply group 3, third ply group 4, and twist rib filler layer 5. The first ply group 2 is laid on the triangular soft film 23, the second ply group 3 is laid on the left mold 8, and the second ply group 4 is laid on the second upper mold 10. After the first ply group 2, second ply group 3, and third ply group 4 are laid, the molds are assembled. The laid triangular soft film 23 is placed on the left mold 8 for positioning. Then, the prepreg of the left mold 8 is folded over, and the left mold 8 is assembled with the right mold 9. Second positioning pins are installed in the third positioning through hole 11 and the fourth positioning through hole 12 to position the left mold 8 and the right mold 9. After positioning, the first threaded through hole 13 and the second threaded through hole 12 are used to position the left mold 8 and the right mold 9. Hexagonal head screws are installed in the through hole 14 to lock the left mold 8 and the right mold 9. Then, the twist strips are filled into the gaps of the A-shaped reinforcing rib composite material part 1, and the edges are trimmed and processed to obtain the twist strip filling layer 5. After the layer is laid, it is sealed in a vacuum bag and placed in a thermostatic jar for heat pre-pressing. Finally, the laid second upper mold 10 is assembled onto the left mold 8 and the right mold 9. The third positioning pin is installed in the seventh positioning through hole 17 and the fifth positioning through hole 15 to position the second upper mold 10 and the left mold 8. The fourth positioning pin is installed in the eighth positioning through hole 18 and the sixth positioning through hole 16 to position the second upper mold 10 and the right mold 9. Finally, the bag making, curing and demolding are completed according to the process requirements to obtain the A-shaped reinforcing rib composite material part 1.

[0070] Furthermore, such as Figure 2 As shown, in step S1, prepreg is applied to the first upper mold 19 and the first lower mold 20 of the triangular soft film forming mold for layering, including:

[0071] A layer of Airpad rubber is laid on the first upper mold 19 and the first lower mold 20 of the triangular soft film forming mold, respectively. After laying the Airpad rubber layer, a layer of plain fiberglass prepreg is laid on the Airpad rubber layer, and finally, a layer of Airpad rubber is laid on the plain fiberglass prepreg layer.

[0072] Further, in step S1, the triangular soft film forming mold is placed on the press platform, and sufficient pressure is injected into the built-in pressure bag 24, including:

[0073] Place the triangular soft film forming mold on the press platform, and connect the compressed air connector 25 on the built-in pressure bag 24 to the air compressor interface. Inflate the built-in pressure bag 24 with a pressure of 6 mbar through the air compressor.

[0074] Furthermore, the prepregs used in step S2 are all carbon fiber unidirectional prepregs.

[0075] In order to achieve the integral molding of the A-shaped reinforcing rib composite material part 1, the molding method of the present invention addresses the issue that the A-shaped frame molding mold will form a hollow structure, making it impossible to obtain the A-shaped reinforcing rib composite material part 1 from all parts. Therefore, a triangular soft film 23 is first prepared. After preparation, prepreg is laid on the triangular soft film 23, the second upper mold 10 of the A-shaped frame molding mold, and the left mold 8. Subsequently, the left mold 8 and the right mold 9 are combined, and pins are used for positioning and screws for locking. After the molds are assembled, the twist strips are prepared and filled. The filling of the twist strip can improve the various mechanical properties of the A-shaped reinforcing rib composite material part 1; finally, the second upper mold 10 is combined and positioned with the left mold 8 and the right mold 9 respectively, and bag making, curing and demolding are completed according to the process requirements to obtain the A-shaped reinforcing rib composite material part 1. The molding method of the present invention can realize the integral molding of the A-shaped reinforcing rib composite material part 1, ensure that the pressure of the part is sufficient and the pressurization is smooth during the molding process, improve the internal quality and surface quality of the part, thereby improving the overall quality of the part, greatly reducing the production cost and improving the preparation efficiency.

[0076] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A molding method for an A-shaped reinforcing rib composite material part, characterized in that, The method includes the following steps: S1, prepreg is applied to the first upper mold and the first lower mold of the triangular soft film forming mold for layup. After layup, the first upper mold and the first lower mold are positioned and assembled. After assembly, the built-in pressure bag is placed in the middle cavity of the triangular soft film forming mold. Then, the triangular soft film forming mold is placed on the press platform, and pressure is injected into the built-in pressure bag. After sufficient pressure is injected, the layup on the first upper mold and the first lower mold is cured to obtain a rough triangular soft film. The rough triangular soft film is trimmed to obtain a triangular soft film. S2, prepreg is laid on all three sides of the triangular soft film to complete the first layup group; prepreg is laid on the left mold of the A-frame forming mold to complete the second layup group; prepreg is laid on the second upper mold of the A-frame forming mold to complete the third layup group; the triangular soft film with prepreg laid on it is placed on the left mold for positioning; then the prepreg laid on the left mold is folded to the other side, and the right mold is assembled so that the folded prepreg is laid on the right mold; finally, the left mold and the right mold are assembled, positioned and locked. S3, manufacture twist strips using twist strip tooling, and fill the twist strips into the A-shaped frame forming mold. After filling, perform hot pre-pressing. After hot pre-pressing, repair the position of the filled twist strips to obtain the twist strip filling layer. S4, assemble the second upper mold with the prepreg laid on it onto the left mold and the right mold and position it, then place the built-in pressure bag into the middle cavity of the mold of the A-shaped reinforcing rib composite material part that has been positioned, then place the mold of the A-shaped reinforcing rib composite material part on the press platform, pressurize the built-in pressure bag, and finally complete the bag making, curing and demolding according to the process requirements to obtain the A-shaped reinforcing rib composite material part; The method is used in the molding die for A-shaped reinforcing rib composite material parts, the molding die including an A-shaped frame molding die, a triangular soft film molding die and an internal pressure bag; The triangular soft film forming mold includes a symmetrical first upper mold and a first lower mold. The built-in pressure bag is used to cooperate with the first upper mold and the first lower mold to generate a triangular soft film, and to cooperate with the triangular soft film and the A-shaped frame forming mold to generate an A-shaped reinforcing rib composite material part. The A-shaped frame forming mold includes a second upper mold and symmetrical left and right molds. The second upper mold, left mold and right mold are used to cooperate with the triangular soft film and the built-in pressure bag to generate the A-shaped reinforcing rib composite material part.

2. The molding method for the A-shaped reinforcing rib composite material part according to claim 1, characterized in that, The triangular soft film forming mold also includes a first positioning pin; The first upper mold is provided with a first positioning through hole, and the first lower mold is provided with a second positioning through hole. When the first upper mold and the first lower mold are assembled, the first positioning through hole and the second positioning through hole are interconnected and located on the same straight line. The first positioning pin is used to position the first upper mold and the first lower mold by passing through the first positioning through hole and the second positioning through hole.

3. The molding method for the A-shaped reinforcing rib composite material part according to claim 2, characterized in that, The A-shaped frame forming mold also includes a second positioning pin; The lower part of the left mold is provided with a third positioning through hole, and the lower part of the right mold is provided with a fourth positioning through hole. When the left mold and the right mold are assembled, the third positioning through hole and the fourth positioning through hole are interconnected and located on the same straight line. The second positioning pin is used to position the left mold and the right mold by passing through the third positioning through hole and the fourth positioning through hole.

4. The molding method for the A-shaped reinforcing rib composite material part according to claim 3, characterized in that, It also includes locking components; The lower part of the left mold is provided with a first threaded through hole, and the lower part of the right mold is provided with a second threaded through hole. When the left mold and the right mold are assembled, the first threaded through hole and the second threaded through hole are interconnected and located on the same straight line. The locking member is used to lock the left mold and the right mold through the first threaded through hole and the second threaded through hole.

5. The molding method for the A-shaped reinforcing rib composite material part according to claim 4, characterized in that, It also includes the third and fourth locating pins; The top surfaces of the left mold and the right mold are respectively provided with a fifth positioning through hole and a sixth positioning through hole. The second upper mold is provided with a seventh positioning through hole and an eighth positioning through hole. When the second upper mold is assembled to the assembled left mold and the right mold, the seventh positioning through hole and the fifth positioning through hole are interconnected and located on the same straight line, and the eighth positioning through hole and the sixth positioning through hole are interconnected and located on the same straight line. The third positioning pin is used to position the second upper mold and the left mold by passing through the seventh positioning through hole and the fifth positioning through hole, and the fourth positioning pin is used to position the second upper mold and the right mold by passing through the eighth positioning through hole and the sixth positioning through hole.

6. The molding method for the A-shaped reinforcing rib composite material part according to claim 5, characterized in that, The first, second, third, and fourth positioning pins are all internally threaded cylindrical pins, the locking element is a hexagonal cylindrical head screw, and the material of the A-shaped frame forming mold is one of P20 or mold steel.

7. The molding method for the A-shaped reinforcing rib composite material part according to claim 1, characterized in that, In step S1, the process of applying prepreg to the first upper mold and the first lower mold of the triangular soft film forming mold for layup includes: An Airpad rubber layer is laid on the first upper mold and the first lower mold of the triangular soft film forming mold, respectively. After laying the Airpad rubber layer, a plain fiberglass prepreg layer is laid on the Airpad rubber layer. Finally, an Airpad rubber layer is laid on the plain fiberglass prepreg layer.

8. The molding method for the A-shaped reinforcing rib composite material part according to claim 7, characterized in that, In step S1, placing the triangular soft film forming mold on the press platform and inflating the built-in pressure bag to a sufficient pressure includes: Place the triangular soft film forming mold on the press platform, and connect the compressed air connector on the built-in pressure bag to the air compressor interface, and pressurize the built-in pressure bag with sufficient pressure through the air compressor.

9. The molding method for the A-shaped reinforcing rib composite material part according to claim 1, characterized in that, The prepregs used in step S2 are all carbon fiber unidirectional prepregs.

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