Composite material antenna beam, preparation method thereof and rail vehicle

Abstract

The invention relates to a composite material antenna beam, a preparation method thereof and a railway vehicle, and belongs to the technical field of composite material forming. The preparation method comprises the steps of preparing the beam; paving a fiber composite material on the surface of the mounting seat mold core to obtain a mounting seat inner layer; bonding the cross beam with the mounting seat inner layer, and paving a fiber composite material on the outer side of a whole formed by the cross beam and the mounting seat inner layer to obtain a mounting seat middle layer; performing autoclave forming on the mounting seat mold core, the mounting seat inner layer, the cross beam and the mounting seat middle layer; and gluing the outer side of the cured middle layer of the mounting seat, paving a fiber composite material to obtain an outer layer of the mounting seat, and performing autoclave forming on the whole device to obtain the composite material antenna beam. The middle part of the cross beam is coated between the mounting seat inner layer and the mounting seat middle layer of the layering structure of the mounting seat, and the mounting seat is not cured during layering, so that the mutual fitting tightness of the surfaces of the mounting seat inner layer and the mounting seat middle layer can be effectively improved, and the connection strength between the cross beam and the supporting seat is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of composite material molding, and in particular relates to a composite material antenna beam and a preparation method thereof, and a rail vehicle. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] The bogie antenna mounting beam (antenna beam) is an important load-bearing accessory of the vehicle and is the mounting carrier of the ATP monitoring antenna. Its structure includes a mounting seat and a horizontal crossbeam. The mounting seat is used to install and fix the antenna beam on the top of the vehicle, and the two ends of the crossbeam are used to install the antenna through structures such as supports; the mounting seat is located in the middle of the crossbeam, and the two are fixedly connected.

[0004] Due to the requirement of lightweight vehicle body, there are technical solutions for preparing antenna beams with composite materials. There are two main ways to connect the mounting base and the horizontal beam. The first is to form the two parts of the beam and the mounting base separately, and then connect them together by bonding and then riveting. The connection is strengthened by the riveting structure to make up for the problem of insufficient bonding strength. However, in this solution, the riveting structure will destroy the continuity of the fibers inside the beam and produce microcracks, which can easily cause connection failure. The second is to lay the prepreg used to prepare the mounting base on the mold after the beam is partially formed, and the two are connected and co-cured; since the interior of the mounting base is a hollow structure, foam needs to be used for filling during molding, and the pressure is transmitted by the foam to compact the prepreg at the connection between the beam and the support base. However, since the foam has a certain elasticity, the pressure transmitted to the connection position is insufficient, which causes problems with the density of the product, thereby affecting the overall strength of the product. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a composite material antenna beam, a preparation method thereof and a rail vehicle, so as to avoid surface defects during the preparation process, improve the forming quality and ensure the mechanical properties of the product.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] In a first aspect, a method for preparing a composite material antenna beam comprises the following steps:

[0008] S1. Prepare a beam;

[0009] S2, laying the fiber composite material on the surface of the mounting seat mold core to obtain the inner layer of the mounting seat;

[0010] S3, gluing the crossbeam to the inner layer of the mounting seat, and then laying the fiber composite material on the outer side of the whole composed of the crossbeam and the inner layer of the mounting seat to obtain the middle layer of the mounting seat;

[0011] S4, subjecting the mounting seat mold core, the mounting seat inner layer, the crossbeam and the mounting seat middle layer to hot-pressing molding;

[0012] S5. Apply glue to the outer side of the cured middle layer of the mounting base and then lay the fiber composite material to obtain the outer layer of the mounting base, and perform autoclave forming on the entire device to obtain the composite antenna beam.

[0013] Optionally, the fiber composite material includes carbon fiber unidirectional tape prepreg and carbon fiber cloth, and the resin matrix is ​​one of a thermosetting resin and a thermoplastic resin.

[0014] Optionally, in S1, the preparation method of the beam includes one or more of a molding blowing process, a three-dimensional weaving process, a tube rolling process, and a pultrusion process.

[0015] Optionally, in S2, 3K twill fabric and T700 unidirectional tape prepreg are laid in sequence from inside to outside, and the thickness of the inner layer of the mounting base is 1.5 to 3 mm.

[0016] Optionally, in S3, after laying the epoxy mold in the set area of ​​the inner layer of the mounting seat, a positioning tool is used to fix the beam to connect the beam to the inner layer of the mounting seat.

[0017] Optionally, in S3, after the surface of the paving area of ​​the inner layer of the mounting seat and the crossbeam is coated with glue, T700 unidirectional tape prepreg and 3K twill fabric are laid in sequence from the inside to the outside, and the thickness of the middle layer of the mounting seat is 4 to 6 mm.

[0018] Optionally, in S4, the mounting seat mold core, the mounting seat inner layer, the crossbeam and the mounting seat middle layer are loaded into the first vacuum system, and then the first vacuum system is sent to the autoclave for curing and forming. The process parameters of the curing process include: pressure 0.6~0.8Mpa, temperature at 80~90℃ for 1~2h and then at 130~150℃ for 3~4h.

[0019] Optionally, in S5, T700 unidirectional tape prepreg and 3K twill fabric are laid in sequence from the inside to the outside, and the thickness of the outer layer of the mounting seat is 1.5 to 3 mm.

[0020] Optionally, in S5, the device including the mounting seat core, the mounting seat inner layer, the crossbeam, the mounting seat middle layer and the mounting seat outer layer is loaded into the second vacuum system as a whole, and then the second vacuum system is sent to the autoclave for curing and forming. The process parameters of the curing process include: pressure 0.6~0.8Mpa, temperature at 80~90℃ for 1~2h and then at 130~150℃ for 3~4h.

[0021] Optionally, the method further includes step S6, removing the antenna beam formed into one piece by hot pressing from the mold core, and gluing a base plate to the bottom of the mounting base.

[0022] In a second aspect, a composite antenna beam is prepared by the method for preparing the composite antenna beam.

[0023] In a third aspect, a rail vehicle includes a bogie, on which the composite material antenna beam is provided.

[0024] The beneficial effects of the present invention are:

[0025] 1. The composite antenna beam provided by the present invention adopts the autoclave forming process, and the middle part of the crossbeam is coated between the inner layer of the mounting seat and the middle layer of the mounting seat of the lamination structure of the mounting seat, with a large effective contact area. Since the mounting seat has not yet been solidified during the lamination, the degree of close fit between the two surfaces can be effectively improved, avoiding the dimensional deviation and internal gaps of the product caused by the separate forming of the two, thereby improving the connection strength between the crossbeam and the support seat. In addition, a variety of fiber composite materials are used for paving, unidirectional tape prepreg is used to provide mechanical properties, and twill fabric, as a two-dimensional fabric, has good tension in all directions, which can effectively avoid the internal unidirectional tape from wrinkling during autoclave forming, thereby effectively improving the flatness of the lamination structure in the product and reducing internal defects. The autoclave forming process can apply uniform pressure to each position of the mounting seat with complex shapes, which can meet the product density requirements.

[0026] 2. In the preparation process of the present invention, the mounting seat is laid in the shape of the core mold and the profile of the beam, and the laying range on the beam can be effectively adjusted during the laying process, so it can be applied to products with different mechanical strength requirements. The larger the laying range, the larger the effective contact area, and the smaller the laying range, the smaller the effective contact area, the simpler the operation, and the lower the equipment requirements.

[0027] 3. The present invention adopts a fiber composite material with a thermosetting resin matrix. After each curing and molding, a layer of epoxy film is first laid on the surface of the product to improve the bonding strength between the subsequently laid prepreg and the cured product. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings in the specification, which constitute 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 improper limitations on the present invention.

[0029] Figure 1 Schematic diagram of the structure of the composite material antenna beam in Example 1, including (a) a schematic diagram of the connection relationship structure, and (b) an exploded view.

[0030] Figure 2 This is a schematic diagram of the structure of the molding tool in Example 1.

[0031] Figure 3 Schematic diagram of the preparation of the inner layer of the mounting base in Example 1.

[0032] Figure 4 This is a schematic diagram of the bonding preparation between the inner layer of the mounting base and the crossbeam in Example 1.

[0033] Figure 5 This is a schematic diagram of the preparation of the middle layer of the mounting base in Example 1.

[0034] Figure 6 This is a schematic diagram of the preparation of the first vacuum system in Example 1.

[0035] Figure 7 Schematic diagram of the preparation of the outer layer of the mounting base in Example 1.

[0036] Among them, 1. crossbeam; 2. mounting seat; 21. inner layer of mounting seat; 22. middle layer of mounting seat; 23. outer layer of mounting seat; 3. bottom plate; 4. flat plate; 5. mounting seat mold core; 6. supporting fixture; 7. positioning plate; 8. first vacuum system. DETAILED DESCRIPTION

[0037] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] A method for preparing a composite material antenna beam comprises the following steps:

[0040] S1. Prepare a beam;

[0041] S2, laying the fiber composite material on the surface of the mounting seat mold core to obtain the inner layer of the mounting seat;

[0042] S3, gluing the crossbeam to the inner layer of the mounting seat, and then laying the fiber composite material on the outer side of the whole composed of the crossbeam and the inner layer of the mounting seat to obtain the middle layer of the mounting seat;

[0043] S4, subjecting the mounting seat mold core, the mounting seat inner layer, the crossbeam and the mounting seat middle layer to hot-pressing molding;

[0044] S5. Apply glue to the outer side of the cured middle layer of the mounting base and lay the fiber composite material to obtain the outer layer of the mounting base, and perform autoclave forming on the mounting base mold core, the inner layer of the mounting base, the crossbeam, the middle layer of the mounting base and the outer layer of the mounting base to obtain the composite antenna beam.

[0045] In the above process, since the middle layer and the outer layer of the mounting base are laid in the shape of the beam contour, the antenna beam with the beam and the mounting base tightly connected can be prepared, avoiding the dimensional deviation and internal gap of the product caused by the separate forming of the two. The connection strength between the beam and the mounting base is improved, thereby effectively optimizing the stress state of the beam and the mounting base, and then improving the comprehensive performance including impact vibration and static load.

[0046] Optionally, the fiber composite material includes carbon fiber unidirectional tape prepreg and carbon fiber cloth, the resin matrix is ​​a thermosetting resin, the carbon fiber unidirectional tape prepreg is mainly used to provide mechanical strength according to the fiber orientation, and the carbon fiber cloth, as a two-dimensional or three-dimensional fabric, can withstand tension in all directions and can maintain a flat surface during the autoclave forming process to avoid wrinkles and defects; and the carbon fiber cloth itself has beautiful patterns and can improve the quality of the outer tube.

[0047] Optionally, the carbon fiber unidirectional tape prepreg includes one or more of T300 unidirectional tape prepreg, T700 unidirectional tape prepreg, T800 unidirectional tape prepreg, and T1000 unidirectional tape prepreg; the carbon fiber cloth includes one or more of 3K twill cloth, 3K plain cloth, 12K twill cloth, and 12K twill cloth.

[0048] Optionally, the resin matrix includes: one or more of thermosetting epoxy resin, thermosetting phenolic resin, thermoplastic polypropylene, and thermoplastic polyetheretherketone.

[0049] Optionally, in S1, the preparation method of the beam includes: one of: molding and blowing, molding and blowing process, three-dimensional weaving process, tube rolling process, and pultrusion process. The prepared beam has a hollow structure with mounting holes or adhesive connectors at both ends for installing the antenna support.

[0050] Optionally, in S2, 3K twill fabric and T700 unidirectional tape prepreg are laid in sequence from the inside to the outside, and the inner layer thickness of the mounting seat is 1.5 to 3 mm. After demoulding, the inner twill fabric is located on the surface of the mounting seat, which has an aesthetic effect.

[0051] Optionally, in S3, after laying glue in a set area of ​​the inner layer of the mounting seat, a positioning tool is used to fix the beam to connect the beam to the inner layer of the mounting seat. Specifically, a structural adhesive film is set in the contact area between the beam and the mounting seat. Since the thermosetting resin beam has been manufactured, the structural adhesive film is required to improve the connection strength between the beam and the mounting seat. The structural adhesive film can be selected as a medium-temperature epoxy adhesive film.

[0052] Optionally, the bonding surface is surface treated including grinding and cleaning before the crossbeam is connected to the inner layer of the mounting seat, and the positioning tool is used to limit the position of the crossbeam relative to the mounting seat (mold) from six degrees of freedom.

[0053] Optionally, in S3, T700 unidirectional tape prepreg and 3K twill cloth are laid in the paving area on the surface of the beam from the inside to the outside in sequence to form the middle layer of the mounting seat. The paving thickness of the middle layer of the mounting seat is 4 to 6 mm. The gluing method is to set a structural adhesive film. The main function of the twill cloth here is to prevent the paving structure from wrinkling in the autoclave.

[0054] Optionally, in S4, the mounting seat mold core, the mounting seat inner layer, the crossbeam and the mounting seat middle layer are loaded into the first vacuum system, and then the first vacuum system is sent to the autoclave for curing and forming, and the process parameters of the curing process include: pressure 0.6-0.8Mpa, temperature 80-90°C for 1-2h and then 130-150°C for 3-4h. The first vacuum system includes an isolation film, a breathable felt, a vacuum bag and a sealing strip, and the first vacuum system completely covers the mounting seat middle layer, and is used to apply uniform pressure to the mounting seat inner layer and the mounting seat middle layer during hot pressing curing in the autoclave; wherein the isolation film is used to protect the outer surface of the mounting seat middle layer; the breathable felt is used to form a gas flow channel from the outer surface of the mounting seat middle layer, and to extract air from various positions of the vacuum bag; the vacuum bag is airtight and is used to form a vacuum environment; the sealing strip is used to seal the interface of the vacuum bag.

[0055] Optionally, in S5, the gluing method is to set a structural adhesive film, and lay T700 unidirectional tape prepreg and 3K twill cloth from the inside to the outside in sequence. The outer layer thickness of the mounting base is 1.5 to 3 mm. The main function of the twill cloth here is to prevent wrinkles in the laid structure in the autoclave and to form a beautiful outer surface.

[0056] Optionally, in S5, the device including the mounting seat mold core, the mounting seat inner layer, the crossbeam, the mounting seat middle layer and the mounting seat outer layer is loaded into the second vacuum system as a whole, and then the second vacuum system is sent to the autoclave for curing and forming, and the process parameters of the curing process include: pressure 0.6~0.8Mpa, temperature at 80~90℃ for 1~2h and then at 130~150℃ for 3~4h; the second vacuum system includes an isolation film, a breathable felt, a vacuum bag and a sealing strip, and the second vacuum system completely covers the outer layer of the mounting seat, and is used to apply uniform pressure to the inner layer and the middle layer of the mounting seat during hot pressing and curing in the autoclave; wherein, the isolation film is used to protect the outer surface of the outer layer of the mounting seat; the breathable felt is used to form a gas flow channel from the outer surface of the outer layer of the mounting seat, and to draw air from various positions of the vacuum bag; the vacuum bag is airtight and is used to form a vacuum environment; the sealing strip is used to seal the interface of the vacuum bag.

[0057] Optionally, the method further includes step S6, removing the antenna beam formed into one piece by hot pressing from the mold core, and gluing a base plate to the bottom of the mounting base, wherein the base plate is used to mount the antenna beam and the vehicle connection structure together.

[0058] The composite material antenna beam is prepared by the method for preparing the composite material antenna beam.

[0059] A rail vehicle comprises a bogie, on which the composite material antenna beam is arranged.

[0060] Example

[0061] A composite antenna beam, such as Figure 1 As shown in (a) of FIG. 1 , it includes a crossbeam 1, a mounting seat 2 and a bottom plate 3. Figure 1 As shown in (b), the crossbeam 1 and the base plate 3 can be formed separately. Since the mounting seat 2 is prepared and formed with the participation of the crossbeam 1, it can fit tightly with the crossbeam 1 with basically no dimensional error. Accordingly, the mounting seat 2 and the crossbeam 1 cannot be actually separated.

[0062] The molding tool used in this embodiment is as follows Figure 2 As shown, it includes a flat plate 4, a mounting seat core 5, a support clamp 6 and a positioning plate 7. The flat plate 4 can be used as a paving operation table, the mounting seat core 5 is used for molding the mounting seat 2, the support clamp 6 is used for clamping the crossbeam 1 and its position is adjustable, and the positioning plate 7 is used as a reference to adjust the support clamp 6 to a set position; since the mounting seat core 5 and the support clamp 6 have a set relative position, the crossbeam 1 and the mounting seat inner layer 21 have a precise relative position when glued.

[0063] The preparation method comprises the following steps:

[0064] S1. Prepare a crossbeam 1 using carbon fiber T700 unidirectional tape prepreg and carbon fiber 3K twill cloth. The resin matrix is ​​a thermosetting resin. After curing and forming, it becomes a crossbeam product for the next step.

[0065] S2, 3K twill fabric and T700 unidirectional tape prepreg are laid on the surface of the mounting seat core 5 from the inside to the outside in sequence to form a Figure 3 The light blue portion is the mounting seat inner layer 21 covering the surface of the mounting seat mold core 5, and the paving thickness is 2 mm;

[0066] S3, such as Figure 4 As shown, after the structure of the set area of ​​the inner layer 21 of the mounting seat is glued, the green beam 1 is fixed with the support fixture 6, and the beam 1 is glued to the inner layer 21 of the mounting seat, and then as shown in FIG. Figure 5As shown, T700 unidirectional tape prepreg and 3K twill fabric are laid in sequence from the inside to the outside in the paving area on the surface of the beam 1 to form a blue mounting seat middle layer 22. The mounting seat middle layer 22 has a thickness of 5 mm and covers the inner light blue mounting seat inner layer 21.

[0067] S4, such as Figure 6 As shown, the mounting seat mold core 5, the mounting seat inner layer 21, the crossbeam 1 and the mounting seat middle layer 22 are loaded into the first vacuum system 8, and after the pressure is maintained, the first vacuum system 8 is sent to the autoclave for curing and forming. The process parameters of the curing process include: the pressure is 0.7Mpa, the temperature is kept at 70°C for 2 hours and then kept at 140°C for 3.5 hours; the first vacuum system 8 includes an isolation film, a breathable felt, a vacuum bag and a sealing strip, which are conventional settings in the field. The first vacuum system 8 completely covers the mounting seat middle layer 22, and is used to apply uniform pressure to the mounting seat inner layer 21 and the mounting seat middle layer 22 during hot pressing and curing in the autoclave for hot pressing and forming;

[0068] S5, such as Figure 7 As shown, after a structural adhesive film is applied on the outer side of the cured mounting seat middle layer 22, T700 unidirectional tape prepreg and 3K twill fabric are laid in sequence from the inside to the outside to obtain a mounting seat outer layer 23 with a thickness of 2 mm. On a flat plate 4, the device including the mounting seat core 5, the mounting seat inner layer 21, a part of the crossbeam 1, the mounting seat middle layer 22 and the mounting seat outer layer 23 is integrally loaded into a second vacuum system. After the pressure is maintained, the second vacuum system is sent to an autoclave for curing and forming. The process parameters of the curing process include: a pressure of 0.7 MPa, a temperature of 70°C for 2 hours and then 140°C for 3.5 hours. The second vacuum system is set according to the first vacuum system 8, and the second vacuum system completely covers the mounting seat outer layer 23. The composite antenna beam is obtained by hot pressing and curing in the autoclave.

[0069] S6, removing the antenna beam formed into one piece by hot pressing from the mold core, and bonding the base plate 3 to the bottom of the mounting seat 2.

[0070] In S1, the crossbeam 1 is made by a molding and blowing process. The manufactured crossbeam 1 is a hollow structure with mounting holes at both ends for mounting the antenna support.

[0071] The mounting seat 2 of the present invention is formed into a product through three layers of lamination and two layers of curing. Figure 7As shown, the first layer is laid to obtain the inner layer 21 of the mounting seat, the second layer is laid to obtain the middle layer 22 of the mounting seat, and the first curing is performed; then the third layer is laid to obtain the outer layer 23 of the mounting seat, and the second curing is performed; thus, a good appearance is obtained, and the problem of insufficient direct connection strength between the beam body and the mounting seat of the product made by the original molding process is solved, resulting in product damage. Compared with the existing technology, the product formed by this solution has good interlayer density and structural strength, and the product strength can meet the incremental test requirements of the GB / T 21563 standard and can meet the requirements of ultrasonic flaw detection.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a composite material antenna beam, characterized in that: The following steps are involved: S1. Prepare a beam; S2, laying the fiber composite material on the surface of the mounting seat mold core to obtain the inner layer of the mounting seat; S3, gluing the crossbeam to the inner layer of the mounting seat, and then laying the fiber composite material on the outer side of the whole composed of the crossbeam and the inner layer of the mounting seat to obtain the middle layer of the mounting seat; S4, subjecting the mounting seat mold core, the mounting seat inner layer, the crossbeam and the mounting seat middle layer to hot-pressing molding; S5. Apply glue to the outer side of the cured middle layer of the mounting base and then lay the fiber composite material to obtain the outer layer of the mounting base, and perform autoclave forming on the entire device to obtain the composite antenna beam.

2. The method for preparing a composite material antenna beam according to claim 1, characterized in that: The fiber composite material comprises carbon fiber unidirectional tape prepreg and carbon fiber cloth, and the resin matrix is ​​a thermosetting resin; Optionally, in S1, the preparation method of the beam includes one or more of a molding blowing process, a three-dimensional weaving process, a tube rolling process, and a pultrusion process.

3. The method for preparing a composite material antenna beam according to claim 1, characterized in that: In S2, 3K twill fabric and T700 unidirectional tape prepreg are laid in sequence from the inside to the outside, and the thickness of the inner layer of the mounting base is 1.5 to 3 mm.

4. The method for preparing a composite material antenna beam according to claim 1, characterized in that: Optionally, in S3, after the glue is spread in the set area of ​​the inner layer of the mounting seat, the crossbeam is fixed using a positioning tool to connect the crossbeam to the inner layer of the mounting seat; Optionally, in S3, after applying glue on the surface of the paving area between the inner layer of the mounting seat and the crossbeam, T700 unidirectional tape prepreg and 3K twill fabric are laid in sequence from the inside to the outside, and the thickness of the middle layer of the mounting seat is 4 to 6 mm.

5. The method for preparing a composite material antenna beam according to claim 1, characterized in that: In S4, the mounting seat mold core, the mounting seat inner layer, the crossbeam and the mounting seat middle layer are loaded into the first vacuum system, and then the first vacuum system is sent to the autoclave for curing and forming. The process parameters of the curing process include: pressure 0.6-0.8Mpa, temperature at 80-90°C for 1-2h and then at 130-150°C for 3-4h.

6. The method for preparing a composite material antenna beam according to claim 1, characterized in that: In S5, T700 unidirectional tape prepreg and 3K twill fabric are laid in sequence from the inside to the outside, and the thickness of the outer layer of the mounting base is 1.5 to 3 mm.

7. The method for preparing a composite material antenna beam according to claim 1, characterized in that: In S5, the device including the mounting seat core, the mounting seat inner layer, the crossbeam, the mounting seat middle layer and the mounting seat outer layer is loaded into the second vacuum system as a whole, and then the second vacuum system is sent to the autoclave for curing and forming. The process parameters of the curing process include: pressure 0.6~0.8Mpa, temperature at 80~90℃ for 1~2h and then at 130~150℃ for 3~4h.

8. The method for preparing a composite material antenna beam according to claim 7, characterized in that: The method comprises step S6, removing the antenna beam formed into one piece by hot pressing from the mold core, and bonding a base plate to the bottom of the mounting base.

9. A composite antenna beam prepared by the method for preparing a composite antenna beam as claimed in any one of claims 1 to 8.

10. A rail vehicle, comprising a bogie, characterized in that: The bogie is provided with a composite antenna beam as described in any one of claims 1-8.

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