Forming die, forming method and beam structural member obtained by the forming method

Abstract

The present invention provides a forming die, a forming method and a beam structural member obtained by the forming method, which relates to the field of manufacturing of beam structural members and is designed to solve the problems of low forming efficiency and many defects of beam structural members obtained by existing manufacturing methods. The forming die includes a die body, a plurality of first cores and a plurality of second cores. The die body includes a bottom plate and a back plate. A plurality of first cavities and a plurality of second cavities are formed between the bottom plate and the back plate. The plurality of first cavities and the plurality of second cavities are alternately arranged along the joint of the bottom plate and the back plate. The plurality of first cores are respectively detachably arranged in the plurality of first cavities in a one-to-one correspondence, and the plurality of second cores are respectively detachably arranged in the plurality of second cavities in a one-to-one correspondence. Moreover, the first core has a fixed contour size, and the second core can elastically deform. The present invention can improve the forming efficiency of beam structural members with a multi-cavity structure and reduce their defects.

Description

Technical Field

[0001] The present invention relates to the field of manufacturing beam structural members, and more particularly, to a forming die, a forming method, and a beam structural member obtained by the forming method. Background Art

[0002] A beam is a commonly used load-bearing structural member among many structural members, and usually plays a role in bearing and transmitting loads. Compared with traditional metal materials, composite materials, especially carbon fiber composite beams, have the characteristics of low density, high specific strength, high specific modulus, good corrosion resistance, and strong designability. Therefore, such beam structural members play a crucial role in the overall structures of aircraft, missiles, etc.

[0003] Currently, the commonly used beam structural members are relatively slender in shape, and many beam structural members also have characteristics such as multiple cavities, thin walls, and stiffeners. Under the condition of meeting strength and stiffness, the weight and cost of the overall structure can be reduced. However, it is more difficult to form beams with complex structures. Especially for the positions of the stiffeners, multiple forming operations need to be carried out first, and then the bonding method is used for forming. Not only is the forming efficiency low, but multiple forming operations will inevitably increase the number of defects, resulting in poor fatigue performance of the beam structural members and making it difficult to ensure the quality and performance requirements of the overall beam structure. Summary of the Invention

[0004] The first object of the present invention is to provide a forming die to solve the technical problems of low forming efficiency and many defects of beam structural members obtained by existing manufacturing methods.

[0005] The forming die provided by the present invention is used for forming a beam structural member with a multi-cavity structure. The forming die includes a die body, a plurality of first cores, and a plurality of second cores. The die body includes a bottom plate and a back plate angledly connected to the bottom plate. Between the bottom plate and the back plate are used to form a plurality of first cavities and a plurality of second cavities. The plurality of first cavities and the plurality of second cavities are arranged alternately in a straight line, and the straight line is parallel to the seam between the bottom plate and the back plate. Among them, the plurality of first cores are respectively detachably arranged in the plurality of first cavities one by one, the plurality of second cores are respectively detachably arranged in the plurality of second cavities one by one, and the first core has a fixed contour size, and the second core can elastically deform.

[0006] Furthermore, the forming die further includes a guiding assembly configured to guide the first core to move in a direction perpendicular to the back plate.

[0007] Further, the guiding assembly includes a positioning block and a guiding strip. The positioning block is provided with a guiding groove, and the guiding strip is slidably engaged with the guiding groove. Among them, one of the positioning block and the guiding strip is fixedly arranged on the back plate, and the other of the positioning block and the guiding strip is fixedly arranged on the first die core.

[0008] Further, the molding die further includes a positioning assembly. The positioning assembly includes positioning holes, strip holes, and positioning pins. Each first die core is provided with the positioning holes. The bottom plate is provided with the strip holes at positions corresponding to the positioning holes. The length direction of the strip holes is perpendicular to the back plate. The positioning pins are inserted into the corresponding positioning holes and the strip holes, and the positioning pins are engaged with the positioning holes.

[0009] Further, each first die core is provided with a plurality of the positioning holes, and the number and positions of the strip holes and the positioning pins correspond to the number and positions of the positioning holes.

[0010] Further, in a direction perpendicular to the back plate, the positioning assembly and the guiding assembly are respectively arranged at two ends of the first die core.

[0011] Further, the material of the first die core is metal, and the material of the second die core is silicone rubber.

[0012] The beneficial effects brought by the molding die of the present invention are as follows:

[0013] By providing a molding die mainly composed of a die body, a plurality of first die cores, and a plurality of second die cores. Among them, the die body includes a bottom plate and a back plate connected at an angle. Between the bottom plate and the back plate are used to form a plurality of first cavities and a plurality of second cavities arranged alternately along their joint seams. The plurality of first cavities are used to detachably arrange a plurality of first die cores with fixed contour dimensions one by one. The plurality of second cavities are used to detachably arrange a plurality of second die cores that can elastically deform one by one.

[0014] When a beam structural member needs to be manufactured, prepreg can be laid on the bottom plate and the back plate of the die body first, prepreg can be laid on the surfaces of the first die cores, and the first die cores can be installed in the corresponding first cavities. Prepreg can be laid on the surfaces of the second die cores, and the second die cores can be installed in the corresponding second cavities. Then, the above-mentioned molding die laid with prepreg is sleeved with a vacuum bag, and air holes are arranged at set positions of the vacuum bag, and a hot press curing process is adopted for curing and forming.

[0015] In this forming die, the die body serves as the female die. During the process of forming the beam structural member described above, under the action of vacuum pressure, the first die core will move in the first cavity towards the bottom plate and the back plate, applying pressure to the prepreg, extruding the prepreg, gradually compacting the prepreg, and discharging the air bubbles in the prepreg; meanwhile, the introduction of the second die core can, under the action of its own elastic deformation, uniformly transfer pressure to the prepreg to ensure that the thickness of the reinforcing ribs in the beam structural member is uniform and the dimensional stability is good. Among them, the prepreg is the body material of the beam structural member.

[0016] This forming die utilizes the combination of the first die core and the second die core to achieve a high-quality one-time overall forming of thin-walled, multi-cavity, multi-ribbed, and special-shaped carbon fiber beam structural members. It not only has high forming efficiency but also few defects, thereby improving the fatigue performance of the beam structural members and ensuring the quality and performance requirements of the beam structural members.

[0017] The second object of the present invention is to provide a forming method to solve the technical problems of low forming efficiency and many defects of beam structural members obtained by existing manufacturing methods.

[0018] The forming method provided by the present invention uses the above-mentioned forming die to form a beam structural member with a multi-cavity structure, including the following steps: laying prepreg on the bottom plate and the back plate of the die body; laying prepreg on the surfaces of each first die core and installing each first die core in the corresponding first cavity; laying prepreg on the surfaces of each second die core and installing each second die core in the corresponding second cavity; using a vacuum bag to cover the above-mentioned forming die with prepreg laid, setting air vents at the set positions of the vacuum bag, and performing curing and forming by the autoclave process.

[0019] Further, in the step of laying prepreg on the surfaces of each first die core, prepreg is laid on the surfaces of each first die core facing the bottom plate, the surfaces of each first die core facing the back plate, and the surfaces of each first die core facing the second die cores on both sides; in the step of laying prepreg on the surfaces of each second die core, prepreg is laid on the surfaces of each second die core facing the bottom plate, the surfaces of each second die core facing the back plate, and the surfaces of each second die core facing the first die cores on both sides.

[0020] The beneficial effects brought by the forming method of the present invention are:

[0021] This forming method uses the above-mentioned forming die to form a beam structural member with a multi-cavity structure, without subsequent bonding and assembly processes, has high forming efficiency, and can effectively reduce the manufacturing defects of the beam structural member, thereby improving the quality and performance of the product.

[0022] The third object of the present invention is to provide a beam structural member to solve the technical problems of low forming efficiency and many defects of beam structural members obtained by existing manufacturing methods.

[0023] The beam structure provided by the present invention is obtained by the above-mentioned forming method.

[0024] The beneficial effects brought by the beam structure of the present invention are as follows:

[0025] Since the beam structure is obtained by the above-mentioned forming method, the forming efficiency of the beam structure is high and the defects are few. In addition, this form of forming the beam structure from prepreg makes the formed beam structure made of carbon fiber, which is not only light in weight and high in overall stiffness, but also has the advantages of uniform thickness, low porosity and good dimensional stability in the part where the reinforcing ribs are provided. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0027] Figure 1 It is a front view structural schematic diagram of the forming die provided by the embodiment of the present invention;

[0028] Figure 2 It is a top view structural schematic diagram of the forming die provided by the embodiment of the present invention;

[0029] Figure 3 It is a bottom view structural schematic diagram of the forming die provided by the embodiment of the present invention;

[0030] Figure 4 It is a left view structural schematic diagram of the forming die provided by the embodiment of the present invention;

[0031] Figure 5 It is a schematic diagram of the beam structure provided by the embodiment of the present invention.

[0032] Description of the Reference Numerals

[0033] 010 Forming die 020 Beam structure

[0034] 021 Bottom wall 022 Side wall

[0035] 023 Reinforcing rib 100 Die body

[0036] 110 Bottom plate 120 Back plate

[0037] 200 First die core 300 Second die core

[0038] 400 Guide assembly 410 Positioning block

[0039] 41 Guide groove 420 Guide bar

[0040] 510 Positioning hole 520 Slotted hole Detailed implementation manners

[0041] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of specific embodiments of the present invention will be given with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] Figure 1 The front view structural schematic diagram of the molding die 010 provided in this embodiment, Figure 2 The top view structural schematic diagram of the molding die 010 provided in this embodiment, Figure 3 The bottom view structural schematic diagram of the molding die 010 provided in this embodiment, Figure 4 The left view structural schematic diagram of the molding die 010 provided in this embodiment. As Figures 1 to 4 shown, this embodiment provides a molding die 010 for molding a beam structure member 020 with a multi-cavity structure, Figure 5 The schematic diagram of the beam structure member 020 provided in this embodiment.

[0043] Please continue to refer to Figures 1 to 4 , specifically, the molding die 010 includes a die body 100, a plurality of first cores 200 and a plurality of second cores 300. The die body 100 includes a bottom plate 110 and a back plate 120 connected to the bottom plate 110 at an angle. Between the bottom plate 110 and the back plate 120, a plurality of first cavities and a plurality of second cavities are formed. The plurality of first cavities and the plurality of second cavities are arranged alternately along a straight line, and the above straight line is parallel to the joint of the bottom plate 110 and the back plate 120. Among them, the plurality of first cores 200 are respectively detachably arranged in the plurality of first cavities, the plurality of second cores 300 are respectively detachably arranged in the plurality of second cavities, and the first core 200 has a fixed contour dimension, and the second core 300 can elastically deform.

[0044] When it is necessary to manufacture Figure 5 the beam structure member 020 shown, prepreg can be first laid on the bottom plate 110 and the back plate 120 of the die body 100, prepreg can be laid on the surface of each first core 200, and each first core 200 can be installed in the corresponding first cavity. Prepreg can be laid on the surface of each second core 300, and each second core 300 can be installed in the corresponding second cavity; then, the above-mentioned molding die 010 laid with prepreg can be sleeved with a vacuum bag, and air holes can be arranged at the set positions of the vacuum bag, and the curing molding can be carried out by using an autoclave process.

[0045] In the molding die 010, the die body 100 serves as a female die. During the molding process of the beam structural member 020, under the action of vacuum pressure, the first die core 200 will move in the first cavity towards the direction close to the bottom plate 110 and the back plate 120, applying pressure to the prepreg, extruding the prepreg, gradually compressing the prepreg, and discharging the air bubbles in the prepreg to the outside. At the same time, the introduction of the second die core 300 can, under the action of its own elastic deformation, uniformly transfer pressure to the prepreg to ensure that the thickness of the reinforcing ribs 023 in the beam structural member 020 is uniform and the dimensional stability is good. Among them, the prepreg is the main material of the beam structural member 020.

[0046] The molding die 010 utilizes the combination of the first die core 200 and the second die core 300 to achieve a high-quality one-time overall molding of the thin-walled, multi-cavity, multi-rib, and special-shaped carbon fiber beam structural member 020. It not only has high molding efficiency but also few defects, thereby improving the fatigue performance of the beam structural member 020 and ensuring the quality and performance requirements of the beam structural member 020.

[0047] In this embodiment, the beam structural member 020 includes a bottom wall 021, side walls 022 angularly connected to the bottom wall 021, and a plurality of reinforcing ribs 023 located between the bottom wall 021 and the side walls 022. The plurality of reinforcing ribs 023 are dispersedly arranged along the length direction of the beam structural member 020. Among them, the bottom wall 021 is formed by the lower surface of the first die core 200, the lower surface of the second die core 300, and the upper surface of the bottom plate 110; the side walls 022 are formed by the rear surface of the first die core 200, the rear surface of the second die core 300, and the front surface of the back plate 120; the reinforcing ribs 023 are formed by the left and right surfaces of the first die core 200 and the left and right surfaces of the second die core 300; the "cavity" in the multi-cavity structure refers to the open cavity formed between any two adjacent reinforcing ribs 023.

[0048] It should be noted that in this embodiment, only a specific structure of the molding die 010 is taken as an example to exemplarily illustrate the structure and working principle of the molding die 010. It can be understood that the specific structure of the molding die 010 can be selected according to the actual beam structural member 020.

[0049] Please continue to refer to Figure 1 and Figure 2 , in this embodiment, the molding die 010 may further include a guiding component 400. Specifically, the guiding component 400 is configured to guide the first die core 200 to move in a direction perpendicular to the back plate 120.

[0050] By providing the guiding assembly 400, the movement of the first core 200 can be guided, so that in the finally formed beam structural member 020, the reinforcing rib 023 is perpendicular to the bottom wall 021, thus avoiding the situation where the beam structural member 020 fails to meet the strength requirements due to the skew of the reinforcing rib 023.

[0051] Please continue to refer to Figure 1 and Figure 2 In this embodiment, the guiding assembly 400 may include a positioning block 410 and a guiding strip 420. Specifically, the positioning block 410 is provided with a guiding groove 411, and the guiding strip 420 is slidably engaged with the guiding groove 411. Among them, the positioning block 410 is fixedly provided on the back plate 120, and the guiding strip 420 is fixedly provided on the first core 200.

[0052] During the process of pressurizing the bagged forming die 010 by using the autoclave process, the guiding strip 420 slides in the guiding groove 411, thereby guiding the first core 200 to move towards the back plate 120 to realize the extrusion of the prepreg.

[0053] This setting form of the guiding assembly 400 has a simple structure. Moreover, during the process of placing the first core 200 into the first cavity, the guiding strip 420 can be easily located in the guiding groove 411, which is convenient for assembly.

[0054] In this embodiment, the positioning block 410 is fixedly provided on the back plate 120 through a threaded connector. Similarly, the guiding strip 420 can also be fixedly provided on the first core 200 through a threaded connector.

[0055] In other embodiments, the positioning block 410 can also be fixedly provided on the first core 200, and the guiding strip 420 can be fixedly provided on the back plate 120.

[0056] Please continue to refer to Figure 2 and Figure 3 In this embodiment, the forming die 010 may further include a positioning assembly. Specifically, the positioning assembly includes a positioning hole 510, a strip-shaped hole 520, and a positioning pin (not shown in the figure). Each first core 200 is provided with the above-mentioned positioning hole 510, and the bottom plate 110 is provided with the above-mentioned strip-shaped hole 520 at a position corresponding to the positioning hole 510. Among them, the length direction of the strip-shaped hole 520 is perpendicular to the back plate 120, and the positioning pin is inserted into the positioning hole 510 and the corresponding strip-shaped hole 520, and the positioning pin is engaged with the positioning hole 510.

[0057] During the installation of the first die core 200, the positioning component can be used to position the first die core 200 in the first cavity. Specifically, the positioning pins are inserted into the positioning holes 510 and the corresponding strip-shaped holes 520. With such a setting, the positions of the reinforcing ribs 023 can be accurately determined, and it is convenient for the installation of the second die core 300.

[0058] In addition, the setting of the strip-shaped holes 520 can also enable the relative movement between the positioning pins and the strip-shaped holes 520, so that during the hot pressing process of the molding die 010, the first die core 200 can move towards the back plate 120 to extrude the prepreg. Moreover, the cooperation between the positioning pins and the strip-shaped holes 520 also plays a guiding role in the movement of the first die core 200.

[0059] Please continue to refer to Figure 2 and Figure 3 , in this embodiment, each first die core 200 is provided with two positioning holes 510, and the number and positions of the strip-shaped holes 520 and the positioning pins correspond to the number and positions of the positioning holes 510.

[0060] By providing two positioning holes 510 in each first die core 200 and using two positioning pins to position the first die core 200, the freedom of rotation of the first die core 200 around the vertical axis can be restricted, thereby enabling the precise positioning of the first die core 200.

[0061] In other embodiments, the number of positioning holes 510 provided in each first die core 200 can also be in other forms, such as three, etc.

[0062] Please continue to refer to Figure 2 , in this embodiment, along the direction perpendicular to the back plate 120, the positioning component and the guiding component 400 are respectively arranged at both ends of the first die core 200. That is to say, in this embodiment, the positioning component is arranged near the rear of the first die core 200, and the guiding component 400 is arranged near the front of the first die core 200.

[0063] This layout of the positioning component and the guiding component 400 enables both the front end and the rear end of the first die core 200 to be guided, avoiding the situation where the first die core 200 swings during movement due to the concentrated guiding position.

[0064] In this embodiment, the material of the first die core 200 can be metal. With such a setting, it can ensure that the first die core 200 always has a fixed contour size and will not deform during the forming process of the beam structural member 020, thereby further ensuring the quality of the beam structural member 020 after forming.

[0065] Specifically, the material of the first die core 200 can be steel. In this embodiment, the material of the mold body 100 can also be steel.

[0066] In this embodiment, the material of the second mold core 300 can be silicone rubber. With this arrangement, the temperature resistance of the second mold core 300 can be improved, thereby further improving the quality of the formed beam structural member 020.

[0067] This embodiment also provides a molding method for molding a beam structural member 020 with a multi-cavity structure using the above molding die 010, including the following steps: laying prepreg on the bottom plate 110 and the back plate 120 of the mold body 100; laying prepreg on the surfaces of the first mold cores 200, and installing the first mold cores 200 into the corresponding first cavities; laying prepreg on the surfaces of the second mold cores 300, and installing the second mold cores 300 into the corresponding second cavities; covering the above molding die 010 with prepreg laid thereon using a vacuum bag, and providing air vents at set positions of the vacuum bag, and performing curing molding using an autoclave process.

[0068] This molding method uses the above molding die 010 to mold a beam structural member 020 with a multi-cavity structure, without subsequent processes such as bonding and assembly, and has high molding efficiency. Moreover, it can effectively reduce the manufacturing defects of the beam structural member 020, thereby improving the quality and performance of the product.

[0069] It should be noted that where to provide the air vents in the vacuum bag and the specific implementation conditions of the autoclave process can be obtained by those skilled in the art according to the existing technology. This embodiment does not make improvements thereto, so no further elaboration will be made.

[0070] Specifically, in this embodiment, in the step of laying prepreg on the surfaces of the first mold cores 200, prepreg is laid on the surfaces of the first mold cores 200 facing the bottom plate 110, the surfaces of the first mold cores 200 facing the back plate 120, and the surfaces of the first mold cores 200 facing the second mold cores 300 on both sides; in the step of laying prepreg on the surfaces of the second mold cores 300, prepreg is laid on the surfaces of the second mold cores 300 facing the bottom plate 110, the surfaces of the second mold cores 300 facing the back plate 120, and the surfaces of the second mold cores 300 facing the first mold cores 200 on both sides. That is to say, the surfaces of the first mold core 200 where prepreg is laid are its left side, right side, back side and bottom side, and the surfaces of the second mold core 300 where prepreg is laid are also its left side, right side, back side and bottom side.

[0071] With this arrangement, not only can the smooth molding of the beam structural member 020 be ensured, but also the waste of prepreg can be reduced.

[0072] Specifically, in this embodiment, in the step of laying prepreg on the surface of each first mold core 200, the prepreg is cut with a dimensional allowance of 25 - 35 mm, or after laying, it is combined in the order from right to left; in the step of laying prepreg on the surface of each second mold core 300, the prepreg is cut with a dimensional allowance of 25 - 35 mm, or after laying, it is combined in the order from right to left.

[0073] With such a setting, it can ensure the structural strength at the joints between the reinforcing ribs 023 and the bottom plate 110 and between the reinforcing ribs 023 and the back plate 120 of the beam structural member 020 after molding, thereby further improving the quality and performance of the beam structural member 020.

[0074] In addition, this embodiment also provides a beam structural member 020, which is obtained by the above molding method.

[0075] Since the beam structural member 020 is obtained by the above molding method, therefore, the beam structural member 020 has high molding efficiency and few defects. In addition, this form of forming the beam structural member 020 from prepreg makes the formed beam structural member 020 made of carbon fiber material, which is not only light in weight and high in overall stiffness, but also has the advantages of uniform thickness, low porosity, and good dimensional stability at the part where the reinforcing ribs 023 are provided.

[0076] In the present invention, a specific embodiment for manufacturing a thin-walled, multi-cavity, multi-rib, special-shaped carbon fiber beam structural member 020 is as follows: The first step: Uniformly apply a release agent on the bottom plate 110 and the back plate 120 of the mold body 100, and after drying, directly lay the prepreg; The second step: Lay the prepreg on the left, right, back, and bottom surfaces of the first mold core 200, and install the first mold core 200 with the prepreg laid thereon into the mold body 100 by using positioning pins and positioning blocks 410; Lay the prepreg on the left, right, back, and bottom surfaces of the second mold core 300, and after laying, sequentially place the second mold core 300 with the prepreg laid thereon between the first mold cores 200; The third step: Cover the entire molding mold 010 with the prepreg laid thereon with a vacuum bag, set the corresponding air vents, and complete the curing and molding by using the autoclave process. During the curing process, the pressure is mainly transmitted through the second mold core 300. After demolding, mill the edge allowance and bevel of the part, and drill holes, thus completing the preparation of the beam structural member 020 in the present invention.

[0077] The forming die 010, forming method and beam structural member 020 obtained by the forming method provided by the present invention can achieve uniform pressure transmission by introducing an elastically deformable second die core 300, thus effectively ensuring uniform thickness of the reinforcing ribs 023 and good dimensional stability. By positioning the first die core 200 by a positioning component and guiding it by a guiding component 400, it can be ensured that when pressurized, the first die core 200 moves downward and backward, effectively applying pressure to the prepreg on the female die, which is beneficial to compacting the product and discharging air bubbles. Therefore, through the combination and application of the first die core 200 and the second die core 300, high-quality integral forming of a thin-walled, multi-cavity, multi-rib, and special-shaped carbon fiber beam structural member 020 can be realized at one time.

[0078] It should be noted that in this embodiment, Figure 1 in the figure, the directions indicated by arrows a and b are the up and down directions respectively, the directions indicated by arrows c and d are the left and right directions respectively, and the directions indicated by arrows e and f are the front and back directions respectively.

[0079] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

[0080] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of another identical element in the process, method, article or device comprising the element.

[0081] In the above embodiments, the descriptions of orientations such as "up", "down", "left", "right", "front", "back", "side", etc. are all based on the figures shown.

[0082] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A molding die, characterized in that, For forming a beam structural member with a multi-cavity structure, the forming die includes a die body (100), a plurality of first die cores (200), a plurality of second die cores (300), a guiding assembly (400) and a positioning assembly. The die body (100) includes a bottom plate (110) and a back plate (120) angledly connected to the bottom plate (110). Between the bottom plate (110) and the back plate (120) is used to form a plurality of first cavities and a plurality of second cavities. The plurality of first cavities and the plurality of second cavities are arranged alternately in a straight line, and the straight line is parallel to the joint of the bottom plate (110) and the back plate (120). Wherein, the plurality of first die cores (200) are respectively detachably arranged in the plurality of first cavities one by one, the plurality of second die cores (300) are respectively detachably arranged in the plurality of second cavities one by one, and the first die core (200) has a fixed contour dimension. The material of the first die core (200) is metal, and the material of the second die core (300) is silicone rubber capable of elastic deformation; the guiding assembly (400) is configured to guide the first die core (200) to move in a direction perpendicular to the back plate (120); the positioning assembly includes a positioning hole (510), a strip hole (520) and a positioning pin. Each first die core (200) is provided with the positioning hole (510), and the strip hole (520) is opened at a position corresponding to the positioning hole (510) on the bottom plate (110). The length direction of the strip hole (520) is perpendicular to the back plate (120). The positioning pin is inserted into the positioning hole (510) and the corresponding strip hole (520), and the positioning pin cooperates with the positioning hole (510). In the direction perpendicular to the back plate (120), the positioning assembly and the guiding assembly (400) are respectively arranged at both ends of the first die core (200).

2. The molding die according to claim 1, wherein, The guiding assembly (400) includes a positioning block (410) and a guiding strip (420). The positioning block (410) is provided with a guiding groove (411), and the guiding strip (420) is slidably matched with the guiding groove (411). Wherein, one of the positioning block (410) and the guiding strip (420) is fixedly arranged on the back plate (120), and the other of the positioning block (410) and the guiding strip (420) is fixedly arranged on the first die core (200).

3. The molding die according to claim 1, wherein, Each first die core (200) is provided with a plurality of the positioning holes (510), and the number and positions of the strip holes (520) and the positioning pins correspond to the number and positions of the positioning holes (510).

4. A forming method, characterized in that, Using the forming die according to any one of claims 1-3 to form a beam structural member with a multi-cavity structure, includes the following steps: Lay prepregs on the bottom plate (110) and the back plate (120) of the mold body (100); lay prepregs on the surfaces of the first cores (200), and install each first core (200) into the corresponding first cavity; lay prepregs on the surfaces of the second cores (300), and install each second core (300) into the corresponding second cavity. Cover the above-mentioned molding die with prepregs laid thereon by using a vacuum bag, set air vents at the set positions of the vacuum bag, and perform curing molding by using an autoclave process.

5. The molding method according to claim 4, characterized in that, In the step of laying prepregs on the surfaces of the first cores (200), prepregs are laid on the surfaces of the first cores (200) facing the bottom plate (110), the surfaces of the first cores (200) facing the back plate (120), and the surfaces of the first cores (200) facing the second cores (300) on both sides; in the step of laying prepregs on the surfaces of the second cores (300), prepregs are laid on the surfaces of the second cores (300) facing the bottom plate (110), the surfaces of the second cores (300) facing the back plate (120), and the surfaces of the second cores (300) facing the first cores (200) on both sides.

6. A beam structural member, characterized in that, The beam structural member is obtained by the molding method according to claim 4 or 5.

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