Flexible honeycomb core structure and complex curved surface structural member

Abstract

The utility model relates to a flexible honeycomb core structure and a complex curved surface structural member. The flexible honeycomb core structure comprises a plurality of core plates of a honeycomb structure, the edges of the plurality of core plates are mutually spliced, and hot melt adhesive films are arranged between the connected core plates; the core plate is provided with a plurality of bee cylinders, each bee cylinder is in a bowknot shape and comprises a first edge and a second edge which are parallel to each other, and a third edge and a fourth edge which are symmetrically arranged, and the third edge and the fourth edge are respectively provided with a splicing included angle part which inclines towards the interior of the bee cylinder. The flexible honeycomb core has instability, stretchability and flexibility in all directions, it is ensured that the core plate can be attached to any complex structure molded surface, the core plate has excellent free deformation capacity within a certain thickness range, and the flexible honeycomb core can be fully suitable for various complex curved surfaces; and the edges of the adjacent core plates can be seamlessly spliced, and the integrity of the honeycomb structure at the spliced part is kept so as to adapt to a large-area or large-size complex curved surface structural member, so that the high-strength connection between the structural members is optimized, and the honeycomb hole grids are kept to be always vertical to the surface of the structural member without collapse.

Description

Technical Field

[0001] The utility model relates to the technical field of supporting structures, in particular to a flexible honeycomb core structure and a complex curved surface structural part. Background Art

[0002] Honeycomb core materials, as lightweight, high-strength composite materials, are widely used in fields such as aerospace and shipping. Generally, honeycomb core materials are stable hexagonal flat plate structures that can achieve strong mechanical support properties. However, due to the aerodynamic design of aircraft and ships, the large number of structural components with complex curved surfaces cannot be met using conventional hexagonal honeycombs. Furthermore, for large-area or large-scale complex curved surface structural parts, the size of existing honeycomb core materials cannot meet the requirements and they need to be spliced ​​together, which also places strict and seamless requirements on the splicing combination of honeycomb core materials. To this end, we have proposed a flexible honeycomb core structure and complex curved surface structural parts. Utility Model Content

[0003] The present application provides a flexible honeycomb core structure and complex curved surface structural parts, which at least solve the problem that conventional hexagonal honeycombs cannot meet the relevant requirements of aerodynamic design of aircraft and ships with a large number of complex curved surfaces in the prior art; and for complex curved surface structural parts with large areas or large sizes, the size of existing honeycomb core materials cannot meet the requirements and need to be spliced, and there are also strict seamless requirements for the splicing combination of honeycomb core materials.

[0004] In a first aspect, the present application provides a flexible honeycomb core structure, comprising a plurality of core plates in a honeycomb structure, wherein the edges of the plurality of core plates are spliced ​​together, and a hot melt adhesive film is provided between the connected core plates;

[0005] The core plate has a plurality of honeycombs, which are in a bow-tie shape and include a first side and a second side parallel to each other, and a third side and a fourth side symmetrically arranged to each other. The third side and the fourth side both have a splicing angle portion inclined toward the inside of the honeycomb.

[0006] Optionally, the splicing angle portion is arranged in the middle of the third side and the fourth side.

[0007] Optionally, the angle of the splicing angle portion is 140°-160°.

[0008] Optionally, the core plate is made of any one of aramid paper honeycomb, quartz fiber cloth honeycomb, carbon fiber honeycomb, and glass cloth honeycomb.

[0009] Optionally, the hot melt adhesive film is made of one of EVA hot melt adhesive film, TPU adhesive film, PES adhesive film, and PA adhesive film.

[0010] Optionally, each of the honeycombs is filled with sound-absorbing blocks.

[0011] Optionally, the sound absorbing block is made of any one of foam and sponge.

[0012] In a second aspect, the present application provides a complex curved surface structural part having the flexible honeycomb core structure described in the first aspect above, and skin layers symmetrically arranged on both sides of the flexible honeycomb core structure.

[0013] Compared with related technologies, the flexible honeycomb core structure and complex curved surface structural member provided by this application have at least the following technical effects:

[0014] The flexible honeycomb core of the bow-tie-shaped honeycomb structure is unstable, stretchable and flexible in all directions, ensuring that the core panel can fit any complex structural surface. It has excellent free deformation ability within a certain thickness range and can be fully applied to various complex curved surfaces. The edges of adjacent core panels can be seamlessly spliced ​​to maintain the integrity of the honeycomb structure at the joints to adapt to large-area or large-size complex curved structural parts. In this way, the high-strength connection between structural parts is optimized, and the honeycomb cells are kept perpendicular to the surface of the structural parts without collapse.

[0015] The details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a schematic diagram of a splicing and assembly of a flexible honeycomb core structure according to an exemplary embodiment.

[0018] Figure 2 It is a schematic diagram showing the disassembly of a flexible honeycomb core structure according to an exemplary embodiment.

[0019] Figure 3 FIG. 1 is a schematic diagram of a honeycomb structure according to an exemplary embodiment.

[0020] Description of reference numerals: core board 10 ; hot melt adhesive film 20 ; honeycomb 30 ; first side 301 ; second side 302 ; third side 303 ; fourth side 304 ; joint angle portion 305 . DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0024] Honeycomb core materials, as lightweight, high-strength composite materials, are widely used in aerospace, shipping, and other fields. Traditional honeycomb core materials are stable hexagonal flat plates, offering strong mechanical support. However, due to the aerodynamic design of aircraft and ships, the large number of structural components with complex curved surfaces cannot be met using conventional hexagonal honeycombs. Furthermore, for complex curved structural components with large areas or dimensions, existing dimensions cannot meet the requirements, placing strict demands on the honeycomb core material for its ability to be joined together.

[0025] Based on the above situation, an embodiment of the present invention provides a flexible honeycomb core structure, which is described in detail below with reference to specific embodiments and drawings.

[0026] Example 1

[0027] An embodiment of the utility model provides a flexible honeycomb core structure. Figure 1 It is a schematic diagram of a splicing and assembly of a flexible honeycomb core structure according to an exemplary embodiment. Figure 2 FIG. 1 is a schematic diagram showing a disassembled flexible honeycomb core structure according to an exemplary embodiment. Figure 1-2 As shown, the flexible honeycomb core structure includes: a plurality of core plates 10 in a honeycomb structure, the edges of the plurality of core plates 10 are spliced ​​together, and a hot melt adhesive film 20 is provided between the connected core plates 10;

[0028] Figure 3 FIG is a schematic diagram of a honeycomb structure according to an exemplary embodiment. Figure 3 The core board 10 has a plurality of honeycombs 30, each of which is in the shape of a bow tie and includes a first side 301 and a second side 302 that are parallel to each other, and a third side 303 and a fourth side 304 that are symmetrically arranged. The third side 303 and the fourth side 304 both have a splicing angle portion 305 that is inclined toward the inside of the honeycomb 30.

[0029] In this implementation, continue to refer to the attached Figure 1-3 The splicing angle portion 305 is provided in the middle of the third side 303 and the fourth side 304, and the angle β of the splicing angle portion 305 is 140°.

[0030] The angle α between the third side 303 / the fourth side 304 and the first side 301 / the second side 302 is 60°-80°, so as to form the bow-tie-shaped honeycomb 30.

[0031] In this embodiment, the core plate 10 is made of any one of aramid paper honeycomb, quartz fiber cloth honeycomb, carbon fiber honeycomb, and glass cloth honeycomb. The hot melt adhesive film 20 is made of any one of EVA hot melt adhesive film, TPU adhesive film, PES adhesive film, and PA adhesive film.

[0032] In the technical solutions of the above embodiments, please refer to the attached Figure 1-3 The flexible honeycomb core of the bow-tie-shaped honeycomb 30 structure is unstable, stretchable and flexible in all directions, ensuring that the core plate 10 can fit any complex structural surface, has excellent free deformation ability within a certain thickness range, and can be fully applied to various complex curved surfaces; and the edges of adjacent core plates 10 can be seamlessly spliced ​​to maintain the integrity of the honeycomb structure at the splicing point, so as to adapt to large-area or large-size complex curved surface structural parts. In this way, the high-strength connection between structural parts is optimized, and the honeycomb cells are kept perpendicular to the surface of the structural parts without collapse.

[0033] Specifically, when adjacent core panels 10 are spliced ​​sideways, the third side 303 of the honeycomb 30 of the first core panel 10 and the fourth side 304 of the honeycomb 30 of the adjacent core panel 10 are spliced ​​together to form a mutually fitting structure. When adjacent core panels 10 are spliced ​​top and bottom, the first side 301 / second side 302 of the honeycomb 30 of the first core panel 10 and the third side 303 and the fourth side 304 form an isosceles trapezoid with an acute-angled side facing the edge. This isosceles trapezoid is snapped into the trapezoidal notch formed between the two parallel honeycombs 30 of the adjacent core panels 10.

[0034] Refer to the attached Figure 1-2 The splicing process of the flexible honeycomb core structure is as follows:

[0035] S1. Cut and repair the core board 10 to be spliced, so that the honeycomb 30 edge of the core board 10 is clear and burr-free, and the splicing part can be butted together, and the gap spacing is as small as possible;

[0036] S2. A hot melt adhesive film 20 is applied to the honeycomb 30 at the edge of the core board 10 in step S1.

[0037] S3. Adjacent core plates 10 are spliced ​​together and shaped using a fixture 40. A certain external force is applied to prevent springback. The external force is adjusted so that the angle of the grid at the joint is consistent with the original grid, and the angle of the grid α is 75±5°.

[0038] S4. Place the spliced ​​core board 10 into an oven to cure the hot melt adhesive film 20. The curing temperature and time are adjusted according to the type of adhesive film. For epoxy resin matrix fiber adhesive film, the curing temperature is 120-180° C. and the curing time is 60-120 min.

[0039] S5. Remove the fixture and complete the splicing to obtain the finished flexible honeycomb core.

[0040] Example 2

[0041] The difference between this embodiment and embodiment 1 is that each of the honeycombs 30 is filled with a sound absorbing block, and the material of the sound absorbing block is any one of foam and sponge.

[0042] For other structures not described, refer to Example 1.

[0043] The present application also provides a complex curved surface structural part having the flexible honeycomb core structure described in the above embodiments 1-2, and skin layers symmetrically arranged on both sides of the flexible honeycomb core structure.

[0044] After step S5, the following steps are also included:

[0045] S6. Composite the finished flexible honeycomb core with the skin layer to obtain a complex curved surface structural part.

[0046] To sum up, the flexible honeycomb core structure and complex curved surface structural parts provided by the embodiments of the present invention, the flexible honeycomb core of the bow-tie-shaped honeycomb 30 structure has instability, stretchability and flexibility in all directions, ensuring that the core plate 10 can fit any complex structural surface, and has excellent free deformation ability within a certain thickness range, and can be fully applied to various complex curved surfaces; and the edges of adjacent core plates 10 can be seamlessly spliced ​​to maintain the integrity of the honeycomb structure at the splicing point, so as to adapt to large-area or large-size complex curved surface structural parts. In this way, the high-strength connection between structural parts is optimized, and the honeycomb cells are kept perpendicular to the surface of the structural parts without collapse.

[0047] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A flexible honeycomb core structure, comprising a plurality of core plates in a honeycomb structure, characterized in that: The edges of several core plates are spliced ​​together, and a hot melt adhesive film is provided between the connected core plates; The core plate has a plurality of honeycombs, each of which is in a bow-tie shape and includes a first side and a second side parallel to each other, and a third side and a fourth side symmetrically arranged to each other, wherein each of the third side and the fourth side has a splicing angle portion inclined toward the interior of the honeycomb; Wherein, the splicing angle portion is arranged in the middle of the third side and the fourth side, and the angle of the splicing angle portion is 140°-160°.

2. The flexible honeycomb core structure according to claim 1, wherein: The core plate is made of any one of aramid paper honeycomb, quartz fiber cloth honeycomb, carbon fiber honeycomb, and glass cloth honeycomb.

3. The flexible honeycomb core structure according to claim 1, wherein: The material of the hot melt adhesive film is one of EVA hot melt adhesive film, TPU adhesive film, PES adhesive film and PA adhesive film.

4. The flexible honeycomb core structure according to claim 1, wherein: Each of the honeycombs is filled with sound-absorbing blocks.

5. The flexible honeycomb core structure according to claim 4, wherein: The sound absorbing block is made of any one of foam and sponge.

6. A complex curved surface structural part, characterized by: The flexible honeycomb core structure comprises the flexible honeycomb core structure according to any one of claims 1 to 5, and skin layers symmetrically arranged on both sides of the flexible honeycomb core structure.

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