Composite material bent rod body extension module and preparation method thereof

Abstract

The invention discloses a composite bent rod body extension module and a preparation method thereof, and belongs to the technical field of composites.The composite bent rod body extension module comprises lining PMI foam, structural adhesive is arranged at the joint of the lining PMI foam, a first adhesive film is arranged outside the lining PMI foam, a composite inner pipe is arranged outside the first adhesive film, a second adhesive film is arranged outside the composite inner pipe, and a composite outer pipe is arranged outside the second adhesive film. The weight can be reduced by about 70%, the influence of environment temperature on assembly is avoided, the environmental applicability of the product is improved, the assembly difficulty of the bent rod body extension module, an airplane and a tractor is reduced, and the traction efficiency of the airplane is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of composite materials, and in particular relates to a composite material bent rod extension module and a preparation method thereof. Background Art

[0002] The curved rod extension module is used for towing. After the aircraft lands and stops, the tractor tows the aircraft to the designated location through the curved rod extension module. Traditional curved rod extension modules are all metal structures, which are heavy and require equipment to assist in assembling them with the aircraft and tractor. The ambient temperature also affects the difficulty of assembling the three. Summary of the invention

[0003] The purpose of the present invention is to provide a composite material curved rod extension module and a preparation method thereof, so as to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides a composite material curved rod extension module, including an inner lining PMI foam, wherein the connection of the inner lining PMI foam is provided with structural adhesive, the outer side of the inner lining PMI foam is provided with a first adhesive film, the outer side of the first adhesive film is provided with a composite inner tube, the outer side of the composite inner tube is provided with a second adhesive film, and the outer side of the second adhesive film is provided with a composite outer tube.

[0005] Preferably, the density of the lining PMI foam is 52kg / m 3 -110 kg / m 3 .

[0006] Preferably, the first adhesive film is attached to the surface of the PMI foam lining.

[0007] Preferably, the composite inner tube is attached to the outer surface of the first adhesive film, and the composite inner tube is a carbon fiber full prepreg or semi-preg at four angles of 0°, 90°, +45°, and -45°.

[0008] Preferably, the second adhesive film is attached to the outer surface of the composite inner tube.

[0009] Preferably, the composite outer tube is attached to the outer surface of the composite inner tube along the 0° direction, and the composite outer tube is made of carbon fiber full prepreg and semi-preg at two angles of 0° and 90°.

[0010] A method for preparing a composite material curved rod extension module comprises the following steps:

[0011] S1. Processing the inner lining PMI foam to the required size and shape;

[0012] S2, integrating the inner lining PMI foam, integrating the inner lining PMI foam in S1 by means of structural adhesive;

[0013] S3, attaching the first adhesive film to the surface of the inner lining PMI foam in S2;

[0014] S4, attaching the composite inner tube to the surface of the first adhesive film in S3;

[0015] S5, heating and pressurizing the product in S4 for curing;

[0016] S6, attaching the second adhesive film to the surface of the product in S5, and laying the composite outer tube;

[0017] S7, heating and pressurizing the product in S6 to solidify it again.

[0018] The present invention discloses the following technical effects: the present invention can reduce weight by about 70%, solves the influence of ambient temperature on assembly, improves product environmental applicability, reduces the difficulty of assembling the bent rod extension module with the aircraft and tractor, and greatly improves aircraft traction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of the inner liner PMI foam before assembly of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the PMI foam liner after assembly of the present invention;

[0022] Figure 3 This is a schematic diagram of the lower mold cavity structure of the mold of the present invention;

[0023] Figure 4 This is a schematic diagram of the foam + composite inner tube structure after one-step curing of the present invention;

[0024] Figure 5 This is a schematic diagram of the foam + composite outer tube structure after secondary curing of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the composite material curved rod extension module of the present invention;

[0026] Figure 7 It is a schematic diagram of the cross-section plying of the composite material curved rod extension module of the present invention.

[0027] In the figure: 1. PMI foam lining; 2. structural adhesive; 3. first adhesive film; 4. composite inner tube; 5. second adhesive film; 6. composite outer tube. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Reference Figure 1-Figure 7 As shown, this embodiment provides a composite material curved rod extension module, including an inner lining PMI foam 1, a structural adhesive 2 is provided at the connection of the inner lining PMI foam 1, a first adhesive film 3 is provided outside the inner lining PMI foam 1, a composite inner tube 4 is provided outside the first adhesive film 3, a second adhesive film 5 is provided outside the composite inner tube 4, and a composite outer tube 6 is provided outside the second adhesive film 5.

[0031] The invention can reduce weight by about 70%, solves the influence of ambient temperature on assembly, improves product environmental applicability, reduces the difficulty of assembling the bent rod extension module with the aircraft and the tractor, and greatly improves aircraft traction efficiency.

[0032] Further optimization scheme, the density of the lining PMI foam 1 is 52kg / m 3 -110 kg / m 3 .

[0033] The density of PMI foam is 75kg / m 3 The foam shape is two semicircles, and the semicircular foam is combined into a full circle as the lining through structural adhesive 2. The PMI foam density can be changed to 110kg / m according to the load conditions and total product weight requirements. 3 or 52kg / m 3 The 180° semicircular foam shape can also be changed to a 90° 1 / 4 circular foam shape according to the actual processing capacity, and then the 1 / 4 circular foam is bonded into a full circle as the lining by structural adhesive 2.

[0034] As a further optimization scheme, the first adhesive film 3 is attached to the surface of the lining PMI foam 1 to wrap it as a whole, and the first adhesive film 3 is used to fill the tiny pits on the surface of the PMI foam and the depressions at the joints. The pit filling material is not limited to the adhesive film, and the structural adhesive 2 can also be used.

[0035] A further optimized solution is that the composite inner tube 4 is attached to the outer surface of the first adhesive film 3. The composite inner tube 4 is carbon fiber full prepreg and semi-preg at four angles of 0°, 90°, +45°, and -45°, with a total thickness of about 16.8 mm. It mainly plays a load-bearing role in fixing the foam shape to prevent deformation, and this part bears the main tensile, bending, and compressive load conditions.

[0036] In a further optimized solution, the second adhesive film 5 is attached to the outer surface of the composite inner tube 4 .

[0037] To further optimize the solution, the composite outer tube 6 is attached to the outer surface of the composite inner tube 4 along the 0° direction. The composite outer tube 6 uses carbon fiber full prepreg and semi-preg at two angles of 0° and 90°, with a total thickness of about 2.12 mm. This part also bears the main tensile, bending and compressive load conditions.

[0038] A method for preparing a composite material curved rod extension module comprises the following steps:

[0039] S1. Process the inner lining PMI foam 1 to the required size and shape. After the foam is dried, it must be processed and used within 24 hours, otherwise it needs to be dried again to prevent moisture from entering and causing foam deformation. When designing the outer diameter of the foam port, it should be ensured that this size is 2mm smaller than the inner diameter of the product port to prevent the foam from deforming after curing, resulting in insufficient inner diameter processing and dimensional deviation. The processing allowance here can be changed according to the actual processing situation.

[0040] S2, integrating the inner lining PMI foam 1, forming the inner lining PMI foam 1 in S1 into a whole by means of structural adhesive 2; using epoxy structural adhesive 2 to bond the foams processed in the first step together to form a whole circle, and after bonding, wrapping a layer of BOPP tape on the surface of the foam to fix the shape of the foam, and then using a vacuum tape to seal the foam as a whole and send it into an oven to heat and accelerate the curing of epoxy structural adhesive 2;

[0041] S3, attaching the first adhesive film 3 to the surface of the lining PMI foam 1 in S2; using the epoxy adhesive film to completely wrap the outer surface of the foam completed in the second step of bonding, and filling and leveling the tiny pits and dents on the foam surface;

[0042] S4, attaching the composite inner tube 4 to the surface of the first adhesive film 3 in S3; wrapping the carbon fiber full prepreg and semi-preg with a thickness of about 16.8 mm layer by layer on the surface of the adhesive film completed in S3, and ensuring the density of the product by laying the semi-preg and heating and vacuuming for pre-forming multiple times during the laying process. The laid semi-preg can also better discharge gas during the fourth step of product curing to ensure the density between layers of the product. After each vacuum pre-compacting is completed, confirm whether the product shape is deformed. If deformed, put the product into the mold for correction in time;

[0043] S5, heating and pressurizing the product in S4 for curing; placing the product completed in S4 into a molding die, completing mold closing, and placing it into a hot press for heating and pressurizing for curing to obtain a material after the composite inner tube 4 and the inner lining PMI foam 1 are combined;

[0044] S6, attach the second adhesive film 5 to the surface of the product in S5, and lay the composite outer tube 6; grind the surface of the material cured in S5 to be rough and clean, and then lay a layer of adhesive film or other forms of structural adhesive 2, adhesive, etc. on the surface; then laminate and wrap the carbon fiber unidirectional prepreg and carbon fiber fabric prepreg with a thickness of about 2.12mm on the outside, and heat and vacuum preform for multiple times to ensure the density of the product;

[0045] S7, putting the product in S6 into an autoclave for heating and pressurizing to solidify, and obtaining the final material. The final solidified material is processed by CNC to obtain the final composite material curved rod extension module.

[0046] In this example, the reinforcing material is a carbon fiber composite material, but it is not limited to composite materials such as carbon fiber, glass fiber, and aramid fiber. The core material selected for the filling area is PMI foam, but it is not limited to PMI, PVC, and other core materials. The selected process is molding and autoclave secondary curing process, but it is not limited to this process.

[0047] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0048] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A composite material curved rod extension module, characterized in that: The invention comprises an inner lining PMI foam (1), wherein a structural adhesive (2) is provided at a connection of the inner lining PMI foam (1), a first adhesive film (3) is provided outside the inner lining PMI foam (1), a composite inner tube (4) is provided outside the first adhesive film (3), a second adhesive film (5) is provided outside the composite inner tube (4), and a composite outer tube (6) is provided outside the second adhesive film (5).

2. The composite material curved rod extension module according to claim 1, characterized in that: The density of the lining PMI foam (1) is 52 kg / m 3 -110 kg / m 3 .

3. The composite material curved rod extension module according to claim 1, characterized in that: The first adhesive film (3) is attached to the surface of the lining PMI foam (1).

4. The composite material curved rod extension module according to claim 1, characterized in that: The composite inner tube (4) is attached to the outer surface of the first adhesive film (3), and the composite inner tube (4) is a carbon fiber full prepreg or semi-preg at four angles of 0°, 90°, +45°, and -45°.

5. The composite material curved rod extension module according to claim 1, characterized in that: The second adhesive film (5) is attached to the outer surface of the composite inner tube (4).

6. The composite material curved rod extension module according to claim 1, characterized in that: The composite outer tube (6) is attached to the outer surface of the composite inner tube (4) along the 0° direction, and the composite outer tube (6) is made of carbon fiber full prepreg and semi-preg at two angles of 0° and 90°.

7. The method for preparing a composite material curved rod extension module according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, processing the lining PMI foam (1), processing the lining PMI foam (1) into a desired size and shape; S2, integrating the inner lining PMI foam (1), the inner lining PMI foam (1) in S1 is integrated by means of a structural adhesive (2); S3, attaching the first adhesive film (3) to the surface of the lining PMI foam (1) in S2; S4, attaching the composite inner tube (4) to the surface of the first adhesive film (3) in S3; S5, heating and pressurizing the product in S4 for curing; S6, attaching the second adhesive film (5) to the surface of the product in S5, and laying the composite outer tube (6); S7, heating and pressurizing the product in S6 to solidify it again.

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