Honeycomb sandwich structure and aircraft cabin door

Abstract

The utility model relates to the field of composite material manufacturing, in particular to a honeycomb sandwich structure and an aircraft cabin door. The honeycomb sandwich structure is provided with a honeycomb body and a skin, the honeycomb body is provided with a top face and a bottom face larger than the top face in area, the side portion of the honeycomb body is provided with an inclined side face, the honeycomb sandwich structure further comprises an anti-collapse plate, the anti-collapse plate comprises a side anti-collapse part and an abutting part, the inclined side face is covered with the side anti-collapse part, and the abutting part abuts against the top face. The skin covers the surface of the honeycomb body and the outer surface of the anti-collapse plate. The lateral anti-sloughing parts of the anti-sloughing plates are used for counteracting pressure generated by the skin on the lateral direction of the honeycomb body in the curing process, part of the pressure borne by the lateral anti-sloughing parts is transmitted to the top face of the honeycomb body through the abutting parts, and the lateral pressure bearing capacity of the honeycomb body is improved; the side anti-collapse part of the anti-collapse plate is of a hollow frame-shaped structure, the rigidity of the side anti-collapse part is guaranteed, the weight of the anti-collapse plate is reduced, and then the phenomenon that the side face collapses due to the fact that the whole honeycomb body is too heavy is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of composite material manufacturing, especially to a honeycomb sandwich structure and airplane cabin door. BACKGROUND

[0002] The honeycomb sandwich composite material is widely applied in the field of aerospace due to its superior performance, and in the process of airplane design, due to the functional requirement and the restriction of space position, the part with large oblique angle and high thickness honeycomb sandwich structure is needed. The honeycomb core has weak ability to bear pressure from the side, and the honeycomb sandwich structure with large oblique angle is prone to the problem of honeycomb lateral collapse during the curing forming of the sandwich part.

[0003] The measures to prevent the honeycomb core from lateral collapse in the prior art are as follows: 1. The honeycomb core cells are filled with fillers in advance in the honeycomb peripheral area and cured, so that the ability of the honeycomb core material edge to bear pressure is strengthened; 2. Anti-skid belts are arranged around the part on the forming mold, and the pre-impregnated material is fixed on the anti-skid belts when the skin is laid; 3. The outer skin is cured first, then the honeycomb and the outer skin are glued, and the honeycomb core is protected by a process blocking ring during gluing, and then the honeycomb is machined to the net size, and the inner skin is laid and cured.

[0004] The first measure has good effect on improving the ability of the honeycomb to bear pressure from the side, but the part has more weight; the second measure has poor effect on the sandwich part with a honeycomb chamfer greater than 30°, and the core material still collapses; and the third measure still has the risk of collapse of the large chamfer honeycomb core during curing of the inner skin. Therefore, it is urgent to provide a sandwich structure to overcome the above defects. UTILITY MODEL CONTENT

[0005] One purpose of the utility model is to provide a honeycomb sandwich structure to solve the technical problems of poor curing effect and excessive overall weight caused by weak lateral pressure bearing capacity of the large chamfer honeycomb core in the prior art, and to achieve the purposes of improving curing quality and reducing weight.

[0006] Another purpose of the utility model is to provide an airplane cabin door to solve the technical problems of poor curing effect and excessive overall weight caused by weak lateral pressure bearing capacity of the large chamfer honeycomb core in the prior art, and to achieve the purposes of improving curing quality and reducing weight.

[0007] To solve the above technical problems, the utility model adopts the following technical scheme:

[0008] The honeycomb sandwich structure comprises a honeycomb body and a skin, the honeycomb body has a top surface, a bottom surface with an area larger than the top surface, and an inclined side surface connected between the top surface and the bottom surface, and further comprises an anti-collapse plate, the anti-collapse plate comprises a side anti-collapse part and an abutting part connected at an angle, the side anti-collapse part is in a hollow frame structure, the side anti-collapse part covers the inclined side surface, the abutting part abuts against the top surface, and the skin covers the surface of the honeycomb body and the outer surface of the anti-collapse plate.

[0009] Optionally, the side anti-collapse part comprises a main frame part, and the shape of the main frame part matches the contour of the inclined side surface.

[0010] Optionally, the side anti-collapse part is in a hollow frame of a mouth-shaped, a sun-shaped or a field-shaped structure.

[0011] Optionally, the abutting part is in a hollow frame structure and is parallel to the top surface.

[0012] Optionally, the outer edge of the abutting part surrounds an area accounting for 5%-30% of the area of the top surface.

[0013] Optionally, the anti-collapse plate further comprises a supporting part, the supporting part is connected to one side of the side anti-collapse part away from the abutting part and is parallel to the bottom surface.

[0014] Optionally, the anti-collapse plate is made of a composite material.

[0015] Optionally, a film is arranged between the honeycomb body and the anti-collapse plate, between the honeycomb body and the skin, and between the anti-collapse plate and the skin.

[0016] Optionally, the inclination angle of the inclined side surface is 30°-90°.

[0017] Beneficial effects:

[0018] The honeycomb sandwich structure disclosed by the utility model sets the anti-collapse plate on the inclined side surface of the side part of the honeycomb body, offsets the pressure generated by the skin on the honeycomb body in the curing process by the side anti-collapse part of the anti-collapse plate, and the part of the pressure borne by the side anti-collapse part is transmitted to the top surface of the honeycomb body by the abutting part, so that the pressure bearing capacity of the honeycomb body in the lateral direction is indirectly improved by the strong pressure bearing capacity of the top surface of the honeycomb body and the rigidity of the anti-collapse plate, and the phenomenon of collapse of the side surface of the honeycomb body in the curing process is avoided, and the curing effect is improved.

[0019] The utility model provides a kind of aircraft cabin door, by adopting honeycomb sandwich structure, the weight of aircraft cabin door can be reduced, the pressure-bearing performance of aircraft cabin door is promoted, the use reliability of aircraft cabin door is improved, the service life of aircraft cabin door is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the front view of the honeycomb sandwich structure provided by the utility model embodiment;

[0021] Figure 2 It is the front view of the mold provided by the utility model embodiment;

[0022] In the figure,

[0023] 1, honeycomb main body;11, top surface;12, inclined side;13, bottom surface;

[0024] 2, skin;

[0025] 3, anti-collapse plate;31, side anti-collapse part;32, abutting portion;33, support part;

[0026] 4, adhesive film;

[0027] 5, mold;

[0028] 6, strippable film. DETAILED DESCRIPTION

[0029] To make the technical problem solved by the utility model, the technical scheme adopted and the technical effect reached more clear, the technical scheme of the utility model is further illustrated below by specific implementation mode in conjunction with the drawings.It can be understood that the specific embodiment described here is only used to explain the utility model, instead of the limitation of the utility model.In addition, it needs to be explained that, for easy description, only relevant part in the drawings is shown instead of all.

[0030] In the description of the utility model, unless another explicit provision and limitation, the term "connection", "connect", "fixed" should be broad-sense understanding, for example, can be fixed connection, can be detachable connection, or integral;Can be mechanical connection, can be electrical connection;Can be directly connected, can be indirectly connected through intermediate medium, can be the communication of two elements or the interaction of two elements.For ordinary skilled in the art, the specific meaning of above-mentioned term in the utility model can be understood according to specific circumstances.

[0031] In the utility model, unless another definite provision and limitation, the first feature is in the second feature "on" or "under", can include that the first and second features are in direct contact, also can include that the first and second features are not in direct contact but contact through other features between them.Moreover, the first feature is "on", "above" and "upper surface" of the second feature, includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "lower surface" of the second feature, includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than the second feature.

[0032] In the description of the present embodiment, the terms "upper", "lower", "right", "left", "horizontal", "vertical", and other orientation or position relationships are based on the orientation or position relationships shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0033] The honeycomb structure originates from bionics, and is one of the great achievements of human bionics applications.The honeycomb sandwich structure refers to a kind of laminated composite material in which a light honeycomb core is sandwiched between two thin skins.The honeycomb sandwich structure is widely used in aerospace industry due to its excellent mechanical properties, and the honeycomb sandwich structure is often used to manufacture various wall panels, such as wing panels, floor panels or thermal insulation panels.

[0034] The present embodiment provides a kind of honeycomb sandwich structure and aircraft door, for solving the technical problems of weak lateral pressure bearing capacity of large chamfer honeycomb core in prior art, which leads to poor curing effect and excessive overall weight.

[0035] As shown in Figure 1 The present embodiment provides a kind of honeycomb sandwich structure and aircraft door, which includes a honeycomb body 1 and a skin 2, the honeycomb body 1 has a top surface 11 and a bottom surface 13 with an area larger than the top surface 11, and an inclined side surface 12 connected between the top surface 11 and the bottom surface 13.That is, the honeycomb sandwich structure presents a ladder-like shape with a small upper part and a large lower part, and the ladder waist is inclined to form the inclined side surface 12, which is a part with smaller pressure bearing capacity.

[0036] The honeycomb sandwich structure further includes an anti-collapse plate 3, the anti-collapse plate 3 includes a side anti-collapse part 31 and an abutting part 32 connected at an angle, the side anti-collapse part 31 covers the inclined side surface 12, and the abutting part 32 abuts against the top surface 11, and the skin 2 covers the surface of the honeycomb body 1 and the outer surface of the anti-collapse plate 3.

[0037] The side anti-collapse part 31 of the anti-collapse plate 3 is covered on the inclined side surface 12 of the honeycomb body 1 which has weak pressure bearing capacity. During the curing process, the pressure generated by the skin 2 on the inclined side surface 12 is borne by the side anti-collapse part 31, and the rigidity of the side anti-collapse part 31 improves the pressure bearing capacity of the inclined side surface 12 to a certain extent. Meanwhile, the abutting part 32 of the anti-collapse plate 3 abuts against the top surface 11 of the honeycomb body 1. Since the area of the top surface 11 of the honeycomb body 1 is smaller than the area of the bottom surface 13, the inclined side surface 12 presents a trend of being inverted to the top surface 11 from bottom to top, that is, the side anti-collapse part 31 also presents a trend of being inverted to the top surface 11. Then, the pressure borne by the side anti-collapse part 31 will be transmitted to the top surface 11 through the abutting part 32, that is, the pressure borne by the side anti-collapse part 31 is partially converted into the downward pressure of the abutting part 32 on the top surface 11, thereby indirectly improving the lateral pressure bearing capacity of the honeycomb body 1. In addition, the side anti-collapse part 31 has a hollow frame structure. The outer frame of the frame structure can ensure the rigidity of the side anti-collapse part 31, and the hollow frame structure can also reduce the overall weight of the anti-collapse plate 3, thereby avoiding the collapse of the honeycomb body 1 due to overweight.

[0038] Optionally, the side anti-collapse part 31 comprises a main frame part, and the shape of the main frame part matches the contour of the inclined side surface 12. The matching of the shape of the main frame part and the contour of the inclined side surface 12 can completely enclose the inclined side surface 12 with the main frame part, thereby facilitating the uniform transmission of the pressure on the whole surface of the inclined side surface 12 to the main frame part, avoiding stress concentration, and enabling the pressure borne by the inclined side surface 12 to be uniformly resisted by the anti-collapse plate 3.

[0039] Optionally, the side anti-collapse part 31 has a hollow frame structure in the shape of a mouth-shaped frame, a sun-shaped frame or a field-shaped frame. The mouth-shaped frame can enable the pressure borne by the inclined side surface 12 to be borne by the four side frames of the mouth-shaped frame. However, if the pressure level borne by the inclined side surface 12 is high, the side anti-collapse part 31 needs to be provided in the shape of a sun-shaped frame or a field-shaped frame or even a grid-shaped frame, so that the side anti-collapse part 31 can have more frame strips to bear the pressure, thereby improving the bearing effect. Of course, the side anti-collapse part 31 having a hollow frame structure in the shape of a mouth-shaped frame, a sun-shaped frame or a field-shaped frame is only a preferred solution. In other embodiments, the side anti-collapse part 31 can also have other shapes as long as it can resist the pressure borne by the inclined side surface 12, and is not limited herein.

[0040] Optionally, the abutting part 32 has a hollow frame structure and is parallel to the top surface 11. The parallel arrangement of the abutting part 32 and the top surface 11 can increase the contact area of the abutting part 32 and the top surface 11, so that the downward pressure generated by the abutting part 32 can more uniformly act on the top surface 11, thereby protecting the top surface 11 to a certain extent and avoiding the deformation of the top surface 11 and the destruction of the structural strength of the honeycomb body 1. Meanwhile, the parallel arrangement can enable the downward pressure to vertically act on the top surface 11, thereby avoiding the generation of lateral component force and the lateral pressure of the honeycomb body 1. Furthermore, the hollow frame structure of the abutting part 32 can also reduce the weight of the abutting part 32, thereby preventing the collapse of the honeycomb body 1.

[0041] Optionally, the outer edge of the abutting part 32 encloses an area of 5%-30% of the area of the top surface 11, preferably 10%-20%. The abutting part 32 can convert the pressure borne by the side anti-collapse part 31 into its own downward pressure on the top surface 11. The top surface 11 of the honeycomb body 1 has strong pressure bearing capacity, but if the area enclosed by the outer edge of the abutting part 32 is too small, the pressure will be too large, which will cause the honeycomb body 1 to collapse from the direction of the top surface 11. If the area enclosed by the outer edge of the abutting part 32 is too large, it will not only increase the load on the top surface 11, but also cause waste of materials. Therefore, the area enclosed by the outer edge of the abutting part 32 is 5%-30% of the area of the top surface 11, preferably 10%-20%.

[0042] Optionally, the anti-collapse plate 3 further comprises a supporting part 33, which is located on the side of the side anti-collapse part 31 away from the abutting part 32 and is parallel to the bottom surface 13. The supporting part 33 can effectively support the side anti-collapse part 31 in the direction of the bottom surface 13 of the honeycomb body 1, and being parallel to the bottom surface 13 can also increase the positional stability of the anti-collapse plate 3.

[0043] Optionally, the outer edge of the supporting part 33 encloses an area of 20%-50% of the area of the bottom surface 13, preferably 30%-40%. The larger the area enclosed by the outer edge of the supporting part 33, the more stable the relative position of the anti-collapse plate 3 and the honeycomb body 1, but too large will cause waste of materials and the improvement of stability is not obvious. Therefore, the area of the supporting part 33 is 20%-50% of the area of the bottom surface 13, preferably 30%-40%.

[0044] Optionally, the anti-collapse plate 3 is made of a composite material, preferably a material such as titanium metal, glass fiber or carbon fiber. The composite material is light in weight and high in strength, which can ensure the lightness of the anti-collapse plate 3, avoid increasing the overall weight of the honeycomb sandwich structure, prevent the risk of collapse, and at the same time ensure the structural strength of the anti-collapse plate 3, thereby improving the success rate of curing.

[0045] Optionally, multiple inclined side surfaces 12 are provided, and multiple anti-collapse plates 3 are also provided, and the multiple side anti-collapse parts 31 are correspondingly provided with the multiple inclined side surfaces 12 one by one, and the multiple abutting parts 32 are all abutted on the top surface 11 and do not interfere with each other. Understandably, when there are multiple inclined side surfaces 12, each inclined side surface 12 needs an anti-collapse plate 3 to improve the lateral pressure bearing capacity, and the abutting parts 32 of the multiple anti-collapse plates 3 all need to be abutted on the top surface 11 to convert the lateral pressure into downward pressure. In order to prevent the multiple abutting parts 32 from being stacked to cause the top surface 11 to collapse due to excessive pressure, the anti-collapse plates 3 are arranged without interfering with each other on the top surface 11.

[0046] Optionally, the inclination angle of the inclined side surface 12 is 30°-90°, preferably 40°-80°. If the inclination angle of the inclined side surface 12 is too small, the risk of lateral collapse is low, and the anti-collapse plate 3 does not need to be used for protection. If the inclination angle of the inclined side surface 12 is too large, the lateral collapse phenomenon is prone to occur, and the anti-collapse plate 3 cannot effectively act on the inclined side surface 12. Therefore, the inclination angle of the inclined side surface 12 is 30°-90°, preferably 40°-80°.

[0047] Optionally, the honeycomb sandwich structure further comprises a plurality of adhesive films 4, which are respectively arranged between the honeycomb body 1 and the anti-collapse plate 3, between the honeycomb body 1 and the skin 2, and between the anti-collapse plate 3 and the skin 2. That is, the components of the honeycomb sandwich structure are connected by the adhesive film 4 to ensure that the components do not separate during curing.

[0048] Optionally, the anti-collapse plate 3 is formed by curing the prepreg coated on the mold 5, and the shape of the mold 5 matches the shape of the honeycomb body 1. The mold 5 and the honeycomb body 1 match in shape, which facilitates the formation of the anti-collapse plate 3 with a shape matching the honeycomb body 1 after the prepreg is cured on the mold 5, thereby ensuring the usability and manufacturing efficiency of the anti-collapse plate 3.

[0049] The above honeycomb sandwich structure is made by the following steps:

[0050] Step one, lay the peelable film 6 on the mold 5, then coat the prepreg on the peelable film 6, and lay another layer of peelable film 6 on the prepreg to form a forming tool;

[0051] Step two, encapsulate the above forming tool and then put it into a hot press tank for curing;

[0052] Step three, after the forming tool is cured, the prepreg is cured into the anti-collapse plate 3, the peelable film 6 is torn off, the anti-collapse plate 3 is taken out, and the adhesive film 4 is pasted on the surface of the anti-collapse plate 3;

[0053] Step four, assemble the anti-collapse plate 3 and the honeycomb body 1 to form an assembled core, and then vacuum compact the assembled core, lay the peelable film 6 on the surface of the assembled core, and stand for a predetermined time to make the anti-collapse plate 3 and the honeycomb body 1 tightly combined;

[0054] Step five, tear off the peelable film 6 on the surface of the assembled core and lay the adhesive film 4, and lay the skin 2 on the adhesive film 4;

[0055] Step six, encapsulate the assembled core and then put it into a hot press tank for curing. After curing, the honeycomb sandwich structure is obtained.

[0056] Specifically, the assembled core can be cured in advance in step four, or cured in step six according to the sequence. That is, the assembled core can be cured in advance without the skin 2, so as to prevent the assembled core from collapsing and delaminating when cured finally in step six. If the curing pressure is large when cured in step four, the honeycomb body 1 is prone to collapse, so a low-temperature curing process can be used when cured in advance in step four.

[0057] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited to the above embodiments. Without departing from the spirit and scope of the present application, various changes and modifications can be made to the present application, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A honeycomb sandwich structure, comprising a honeycomb body (1) and a skin (2), wherein the honeycomb body (1) has a top surface (11), a bottom surface (13) with an area larger than the top surface (11), and an inclined side surface (12) connecting the top surface (11) and the bottom surface (13), characterized in that, The honeycomb sandwich structure also includes an anti-collapse plate (3), which includes a side anti-collapse part (31) and an abutment part (32) connected at an angle. The side anti-collapse part (31) has a hollow frame structure. The side anti-collapse part (31) covers the inclined side (12), and the abutment part (32) abuts against the top surface (11). The skin (2) covers the surface of the honeycomb body (1) and the outer surface of the anti-collapse plate (3).

2. The honeycomb sandwich structure according to claim 1, characterized in that, The side anti-collapse part (31) includes a main frame part whose shape matches the outline of the inclined side surface (12).

3. The honeycomb sandwich structure according to claim 2, characterized in that, The side anti-collapse part (31) is a hollow frame in the shape of a square, a sun, or a field.

4. The honeycomb sandwich structure according to claim 1, characterized in that, The abutting part (32) has a hollowed-out frame structure and is parallel to the top surface (11).

5. The honeycomb sandwich structure according to claim 4, characterized in that, The area formed by the outer edge of the abutment portion (32) accounts for 5%-30% of the area of ​​the top surface (11).

6. The honeycomb sandwich structure according to claim 1, characterized in that, The anti-collapse plate (3) also includes a support (33), which is connected to the side of the side anti-collapse part (31) away from the abutment part (32) and parallel to the bottom surface (13).

7. The honeycomb sandwich structure according to claim 1, characterized in that, The anti-collapse board (3) is made of composite material.

8. The honeycomb sandwich structure according to claim 1, characterized in that, An adhesive film (4) is provided between the honeycomb body (1) and the anti-collapse plate (3), between the honeycomb body (1) and the skin (2), and between the anti-collapse plate (3) and the skin (2).

9. The honeycomb sandwich structure according to any one of claims 1-8, characterized in that, The tilt angle of the tilted side (12) is 30°-90°.

10. An aircraft cabin door, characterized in that, The aircraft door includes a honeycomb sandwich structure as described in any one of claims 1-8.

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