Method for preventing bonding collapse of honeycomb diagonal plane

Abstract

The invention provides a method for preventing bonding collapse of a honeycomb diagonal plane, and belongs to the technical field of bonding maintenance of beveled honeycombs, and the method comprises the steps that filled polystyrene foam is heated to expand and escape in the curing process, and the polystyrene foam is in contact with a special skin assembly and supports a honeycomb wall so as to improve the honeycomb strength; the possibility that the honeycomb structure is damaged in the curing and bonding process is reduced; the polystyrene foam is limited in the polystyrene foam curing process by utilizing the appearance mold, so that the polystyrene foam is directly shaped along the shape of the appearance mold, the polystyrene foam is extruded out to form the bonding layer, and the honeycomb bonding part to be bonded and the component to be bonded can be directly bonded after the polystyrene foam is cured, so that the bonding efficiency is improved on the basis of simplifying the operation. The bonding quality and efficiency are improved; the skin assembly and the appearance mold protect the honeycomb from being extruded and collapsed, the external force of the vacuum bag is prevented from being transmitted to the fragile honeycomb wall on the lower side in the curing process, the edge honeycomb is further prevented from being damaged and collapsed in the bonding and curing process, and the bonding quality and the success rate are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of beveling honeycomb bonding repair, and particularly relates to a method for preventing bonding collapse of a beveling honeycomb surface. BACKGROUND

[0002] Aircraft composite materials have high specific strength, corrosion resistance, and good shock absorption, and are widely used in the main structures of civil aviation passenger aircraft. Composite honeycomb structures are widely used in aviation components due to their designable strength, stiffness, and lightweight characteristics, but have the problems of large thickness and low space utilization, and the edge stability needs to be strengthened through edge sealing process. In special parts such as the C area of the radar cover and the edge of the front cabin door, the honeycomb structure is often designed in a beveling shape to adapt to the space limitation.

[0003] After the beveling treatment of the honeycomb structure, the strength of the honeycomb is affected. In the process of curing and bonding the beveling honeycomb by using a hot press tank, the pressing force on the to-be-bonded honeycomb is increased to improve the bonding effect. However, the beveling honeycomb is easily damaged and collapsed during the pressing process, which affects the quality and effect of the bonding work. SUMMARY

[0004] The present application aims to at least solve one of the problems in the prior art or related art.

[0005] Therefore, according to the embodiments of the present application, a method for preventing bonding collapse of a beveling honeycomb surface is provided, which comprises the following steps: installing a skin assembly above the honeycomb surface of the to-be-bonded honeycomb; filling foaming glue into the honeycomb core of the to-be-bonded honeycomb; installing an outer shape mold above the skin assembly; performing curing treatment, and the outer shape mold extrudes the expanded foaming glue to the outside of the to-be-bonded honeycomb to bond the to-be-bonded honeycomb.

[0006] In a feasible embodiment, the method for preventing bonding collapse of a beveling honeycomb surface further comprises the following steps: removing damaged parts on the to-be-bonded part; dehumidifying and cleaning the to-be-bonded part; butting the to-be-bonded honeycomb and the to-be-bonded part to splice a repair outer shape surface.

[0007] In a feasible embodiment, the method for preventing bonding collapse of a beveling honeycomb surface further comprises the following step: after the bonding of the to-be-bonded honeycomb is completed, peeling the outer shape mold from the to-be-bonded honeycomb.

[0008] In a feasible embodiment, the to-be-bonded honeycomb is a beveling honeycomb.

[0009] In an embodiment, the method for preventing the collapse of the honeycomb bevel joint further comprises: Preparation of the whole profile and skin material; Cutting the profile before removing the damaged part; Contouring the profile according to the repair contour; Assembling the profile and the skin material to form a skin assembly.

[0010] In an embodiment, the skin assembly completely covers the repair contour; The contour mold extends beyond the skin assembly, and the contour mold covers the skin assembly and the honeycomb bevel transition position of the repair contour, so that the foaming glue forms a transition surface at the transition position.

[0011] In an embodiment, the contour mold is installed above the skin assembly, and the method further comprises the steps of: Laying a hole separation film on the skin assembly; Laying a glue absorption layer on the hole separation film.

[0012] In an embodiment, the contour mold is installed above the skin assembly, and the method further comprises the steps of: Laying a breathable layer to make the foaming glue tightly contact with the contour mold after curing.

[0013] In an embodiment, the hole separation film, the glue absorption layer, and the breathable layer are removed after the honeycomb joint is completed.

[0014] In an embodiment, The contour mold is made of ceramic material; The profile of the skin assembly is made of ceramic material.

[0015] Compared with the prior art, the method for preventing the collapse of the honeycomb bevel joint has the following beneficial effects: The method for preventing the collapse of the adhesive of the beehive inclined surface provided by the embodiment of the application fills the foaming glue which is expanded and escaped by heating in the curing process, and the foaming glue contacts the special skin assembly and supports the beehive wall, so as to improve the strength of the beehive and reduce the possibility of damage of the beehive structure in the curing and adhesive process; the foaming glue is directly shaped along the shape of the contour mold by limiting the foaming glue in the curing process of the foaming glue by using the contour mold, and the foaming glue is extruded to form an adhesive layer, the adhesive layer contacts the beehive with adhesive and the component to be adhered, and after the foaming glue is cured, the beehive with adhesive can be directly adhered to the component to be adhered, the adhesive strength is increased, and the adhesive quality and efficiency are improved on the basis of simplifying the operation; meanwhile, the skin assembly and the contour mold protect the beehive from extrusion and collapse, the contour of the contour mold is hard, the external force of the vacuum bag in the curing process is avoided from being transmitted to the lower fragile beehive wall, so that the whole adhesive process is smoothly carried out, the damage and collapse of the edge beehive in the adhesive curing process are further avoided, and the adhesive quality and success rate are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings provided herein are for illustrative purposes only and, therefore, should not be considered to be limiting in any way. Like reference characters in the drawings are denoted by like reference characters throughout the various figures. In the drawings: Figure 1 A schematic step flow chart of the method for preventing the collapse of the adhesive of the beehive inclined surface provided by an embodiment of the application; Figure 2 A schematic structural diagram of the method for preventing the collapse of the adhesive of the beehive inclined surface provided by an embodiment of the application; In which, Figure 2 The correspondence between the reference signs in the drawings and the component names is as follows: 11, component to be adhered; 12, beehive to be adhered; 13, skin assembly; 14, contour mold; 15, hole separation film; 16, glue absorption layer. DETAILED DESCRIPTION

[0017] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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 limiting the present application.

[0018] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0019] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0020] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0021] As shown in Figure 1 According to the embodiments of the present application, a method for preventing the collapse of the adhesive bonding of the honeycomb bevel surface is provided, comprising: Step 100: installing the skin assembly 13 above the honeycomb face of the honeycomb 12 to be bonded; Step 200: filling the foaming glue into the honeycomb core of the honeycomb 12 to be bonded; Step 300: installing the outer shape mold 14 above the skin assembly 13; Step 400: performing curing treatment, the outer shape mold 14 extrudes the expanded foaming glue to the outside of the honeycomb 12 to be bonded, so as to bond the honeycomb 12 to be bonded.

[0022] The method for preventing the collapse of the adhesive of the honeycomb bevel surface provided by the embodiment of the application fills the foaming glue, which expands and escapes during the curing process, in contact with the special skin assembly 13 and supports the honeycomb wall, so as to improve the strength of the honeycomb and reduce the possibility of damage to the honeycomb structure during the curing and adhesive process. The foaming glue is limited by the shape mold 14 during the curing process of the foaming glue, so that the foaming glue is directly shaped along the shape of the shape mold 14 and is extruded to form an adhesive layer. The adhesive layer is in contact with the honeycomb with adhesive and the component 11 to be bonded. After the foaming glue is cured, the honeycomb 12 to be bonded can be directly bonded with the component 11 to be bonded. On the basis of simplifying the operation, the bonding strength is increased, and the bonding quality and efficiency are improved. Meanwhile, the skin assembly 13 and the shape mold 14 protect the honeycomb from extrusion and collapse. The shape of the shape mold 14 is hard, so that the external force of the vacuum bag during the curing process is not transmitted to the lower fragile honeycomb wall, so that the whole bonding process is smoothly carried out, and the damage and collapse of the edge honeycomb during the bonding and curing process are further avoided, and the bonding quality and success rate are improved.

[0023] In a feasible implementation, the method for preventing the collapse of the adhesive of the honeycomb bevel surface further comprises: Removing the damaged part on the component 11 to be bonded; Dehumidifying and cleaning the component 11 to be bonded; Butt joining the honeycomb 12 to be bonded with the component 11 to be bonded to splice the repair shape surface.

[0024] In the technical solution, after the damaged part on the component 11 to be bonded is removed, the component 11 to be bonded is dehumidified and cleaned, then the honeycomb 12 to be bonded is placed at the original damaged part, and the honeycomb 12 to be bonded is butt joined with the component 11 to be bonded. The dehumidification and cleaning of the component 11 to be bonded reduce the moisture content of the spliced surface, reduce the tolerance of the spliced repair shape surface, reduce the fitting gap between the honeycomb 12 to be bonded and the component with adhesive, and further improve the pressure transmission efficiency between the honeycomb 12 to be bonded and the component with adhesive.

[0025] In a feasible implementation, the method for preventing the collapse of the adhesive of the honeycomb bevel surface further comprises: After the bonding of the honeycomb 12 to be bonded is completed, the shape mold 14 is peeled off from the honeycomb 12 to be bonded.

[0026] In the technical solution, the shape mold 14 plays a role in protecting the honeycomb with adhesive and shaping the foaming glue during the bonding process of the honeycomb 12 to be bonded. After the foaming glue is cured and shaped, non-destructive demolding is performed to protect the structural integrity of the adhesive layer.

[0027] In a feasible implementation, the honeycomb 12 to be bonded is a bevel honeycomb.

[0028] In this technical solution, the special design parts and outer edge sealing parts of the aircraft are repaired by using oblique honeycomb to repair and reduce weight, so as to meet the aerodynamic shape requirements of the aircraft. At the same time, the connection between the oblique honeycomb and the component 11 to be bonded is smoothly transitioned by the adhesive layer formed by foam, which can eliminate the stress concentration of traditional right-angle joints and ensure the strength and quality of the part to be bonded after the bonding repair.

[0029] In one feasible implementation, the method for preventing the collapse of the honeycomb bevel bonding also includes: Prepare the entire profile and skin material; Cut the profile before removing the damaged area; Based on the external shape of the material, perform shape adjustments. The profile and skin material are assembled to form skin assembly 13.

[0030] In this technical solution, the profile is cut and prepared before the damage is removed, and its shape is adjusted according to the repair surface to ensure that the profile can fit tightly with the repair surface and the mold 14, so as to avoid impact on the honeycomb 12 to be bonded and the bonded parts after the profile is under pressure. During the bonding repair process, the skin material and the honeycomb to be bonded are doubly protected by the profile and the mold 14 to prevent the honeycomb to be bonded from being damaged during the bonding repair. After the mold 14 is removed, the skin material and the bonded honeycomb are protected by the profile. The profile evenly distributes the pressure on the honeycomb and avoids pressure concentration, so as to protect the bonded honeycomb and its connection with the parts to be bonded 11, and improve the bonding quality.

[0031] like Figure 2 As shown, in one possible implementation, the skin assembly 13 completely covers the exterior surface of the maintenance area; The outer mold 14 extends to the outside of the skin assembly 13, and the outer mold 14 covers the honeycomb beveled turning position of the skin assembly 13 and the repair outer surface, so that the foam forms a transition surface at the turning position.

[0032] In this technical solution, the outer mold 14 covers the skin assembly 13 and the honeycomb beveled transition position of the repair outer surface, so that the foaming adhesive is shaped and cured along the outer mold 14 at the transition position and forms a transition surface. The outer mold 14 covers the beveled transition area to protect the edge from compression and collapse.

[0033] like Figure 2 As shown, in one possible embodiment, the outer mold 14 is mounted on top of the skin assembly 13, prior to the following steps: A porous separation membrane 15 is laid on the skin assembly 13; An adhesive-absorbing layer 16 is laid on the porous separation membrane 15.

[0034] In the technical scheme, the hole separation film 15 is laid before the profile mold 14 is installed, and then the glue absorption layer 16 is laid to absorb the escaped foaming glue, so that the profile mold 14 can be peeled off without damaging the skin assembly 13 after being bonded and solidified, and structural damage caused by demolding is prevented.

[0035] In a feasible implementation, the profile mold 14 is installed above the skin assembly 13, and the steps of: The air-permeable layer is laid to make the foaming glue tightly contact with the profile mold 14 after being solidified.

[0036] In the technical scheme, the air-permeable layer is laid to keep the gas in the whole vacuum device circulating during solidification, so that the foaming glue tightly contacts with the profile mold 14 after being solidified, which is beneficial to keeping the thickness of the bonding layer formed by the foaming glue consistent and improving the bonding quality.

[0037] In a feasible implementation, the hole separation film 15, the glue absorption layer 16 and the air-permeable layer are removed after the bonding of the honeycomb 12 to be bonded is completed.

[0038] In the technical scheme, the hole separation film 15, the glue absorption layer 16 and the air-permeable layer are removed after the profile mold 14 is removed, so as to ensure the surface quality of the transition surface.

[0039] In a feasible implementation, the profile mold 14 is made of ceramic material; and the profile of the skin assembly 13 is made of ceramic material.

[0040] In the technical scheme, the profile mold 14 and the profile are both made of ceramic material, so that the thermal expansion coefficients of the profile mold 14 and the profile are matched during the solidification process, the deformation difference between the profile mold 14 and the profile during the solidification process is reduced, the thickness of the bonding layer formed by the foaming glue after expansion is ensured to be uniform, the ceramic profile has long-term weather resistance and acid and alkali corrosion resistance, and the skin material and the bonded honeycomb are protected, so that the honeycomb is adapted to a high-salt-mist environment.

[0041] It is easy for those skilled in the art to understand that the above-mentioned embodiments can be freely combined and superimposed without conflict.

[0042] The above is only a preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only a preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principle of the present application, a number of improvements and modifications can be made, which should be regarded as the protection scope of the present application.

Claims

1. A method of preventing the collapse of a cellular bevel bond, characterized by, The method for preventing the collapse of the adhesive joint of the beehive bevel surface comprises the following steps: installing a skin assembly above the beehive surface of the beehive to be bonded; filling the beehive core of the beehive to be bonded with foaming glue; installing a profile mold above the skin assembly; performing a curing process, and the profile mold extrudes the expanded foaming glue to the outside of the beehive to be bonded to bond the beehive.

2. The method of preventing adhesive collapse of a beveled corner of a honeycomb according to claim 1, wherein, The method for preventing the collapse of the adhesive joint of the beehive bevel surface further comprises the following steps: removing damaged parts on the parts to be bonded; dehumidifying and cleaning the parts to be bonded; abutting the beehive to be bonded with the parts to be bonded to splice the repair profile surface.

3. The method of preventing adhesive collapse of a beveled corner of a honeycomb according to claim 1, wherein, The method for preventing the collapse of the adhesive joint of the beehive bevel surface further comprises the following steps: After the bonding of the beehive to be bonded is completed, the profile mold is peeled off from the beehive to be bonded.

4. The method for preventing the collapse of the adhesive joint of the beehive bevel surface according to claim 1, wherein the beehive to be bonded is a bevel beehive.

5. The method of preventing adhesive collapse of a beveled corner of a honeycomb according to claim 4, wherein, The method for preventing the collapse of the adhesive joint of the beehive bevel surface further comprises the following steps: preparing the whole profile and skin materials; cutting the profile before removing the damaged parts; profiling the profile according to the repair profile surface; assembling the profile and the skin material to form the skin assembly.

6. The method for preventing the collapse of the adhesive joint of the beehive bevel surface according to claim 5, wherein the skin assembly completely covers the repair profile surface; the profile mold extends to the outside of the skin assembly, and the profile mold covers the skin assembly and the beehive bevel transition position of the repair profile surface, so that the foaming glue forms a transition surface at the transition position.

7. The method of preventing adhesive collapse of a beveled corner of a honeycomb according to claim 1, wherein, Before the profile mold is installed above the skin assembly, the method further comprises the following steps: laying a hole separation film on the skin assembly; laying a glue absorption layer on the hole separation film.

8. The method for preventing the collapse of the adhesive joint of the beehive bevel surface according to claim 7, wherein before the profile mold is installed above the skin assembly, the method further comprises the following steps: laying a breathable layer to make the foaming glue tightly contact with the profile mold after curing.

9. The method for preventing the collapse of the adhesive joint of the beehive bevel surface according to claim 8, wherein after the bonding of the beehive to be bonded is completed, the hole separation film, the glue absorption layer and the breathable layer are removed.

10. The method for preventing the collapse of the adhesive joint of the beehive bevel surface according to any one of claims 1-9, wherein the profile mold is made of ceramic material; the profile of the skin assembly is made of ceramic material.

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