A process method for strengthening the bonding of composite material panel ribs

Abstract

The present invention discloses a process method for strengthening the bonding of composite material panel ribs, including the following steps: bonding the ribs and the skin through an adhesive and a positioning tooling or an adhesive and a rib occupancy line; performing strengthening treatment at the bonding position of the ribs and the skin, including grinding the R corner, cleaning, drying, and coating with resin, and fiber layering strengthening; placing a debonding material on the mating skin, sequentially impregnating a preset number of layers of peelable cloth and fiber layering on the debonding material, and curing and forming; bonding the fiber layering on the ribs by positioning and mating the two skins; performing strengthening treatment at the bonding position of the ribs and the fiber layering, including grinding the R corner, cleaning, drying, and coating with resin, and fiber layering strengthening; applying an adhesive on the fiber layering and performing skin mating. The present invention uses fibers to strengthen the bonding position, increases the bonding area, and ensures the bonding strength. At the same time, the bonding thickness (i.e., the adhesive thickness) can be controlled by adjusting the thickness of the debonding material or the number of layers of the peelable cloth, so as to ensure better bonding strength.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and particularly to a process method for bonding and strengthening composite material panel ribs. Background Art

[0002] Carbon fiber reinforced resin matrix composite material is a new type of material with light weight and high strength. Its panel rib structure has better stiffness and strength and is widely used in the automotive industry and the aerospace field. At present, the manufacturing of composite material panel rib structures mainly adopts co-bonding and autoclave processes. The adhesive mainly uses expensive adhesive films, resulting in high manufacturing costs, difficult control of bonding quality, and difficult guarantee of the bonding strength between the two ends of the rib and the skin after the component is closed. Summary of the Invention

[0003] In order to solve the above problems, the present invention proposes a process method for bonding and strengthening composite material panel ribs. Fibers are used to strengthen the bonding position, increasing the bonding area and ensuring the bonding strength. At the same time, the bonding thickness (i.e., the adhesive thickness) can be controlled by adjusting the thickness of the debonding material or the number of layers of the peel ply, thereby ensuring better bonding strength.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A process method for bonding and strengthening composite material panel ribs, comprising the following steps:

[0006] S1. Bond the rib to the skin through the adhesive and the positioning tooling or through the adhesive and the rib occupancy line.

[0007] S2. Perform strengthening treatment at the bonding position between the rib and the skin, including grinding the R corner, cleaning, drying, coating resin, and fiber layup strengthening.

[0008] S3. Place the debonding material on the mating skin, and sequentially impregnate a preset number of layers of peel ply and fiber layup on the debonding material, and cure and form.

[0009] S4. Bond the fiber layup to the rib by positioning and mating the two skins.

[0010] S5. Perform strengthening treatment at the bonding position between the rib and the fiber layup, including grinding the R corner, cleaning, drying, coating resin, and fiber layup strengthening.

[0011] S6. Apply the adhesive on the fiber layup and perform skin mating.

[0012] Further, step S1 includes: respectively roughening the bonding positions of the rib and the skin by sandpaper, cleaning and drying the roughened positions with a cleaning agent, bonding the rib and the skin with an adhesive to a positioning tooling or with an adhesive to the rib occupancy line after drying, and then forming an R corner on both sides of the rib with the extruded adhesive by a chamfering tool, and curing and forming.

[0013] Further, step S2 includes: after the adhesive is cured, sanding the R corner and its two sides by sandpaper, and cleaning and drying the roughened positions with a vacuum cleaner in cooperation with a cleaning agent, and impregnating with fiber reinforcement after applying resin in the R area after drying.

[0014] Further, step S4 includes: aligning two skins through positioning, applying an adhesive with a preset thickness on the edge section where the rib contacts the aligned skin before alignment, closing the mold to bond the fiber ply on the aligned skin to the rib, and curing and forming.

[0015] Further, step S5 includes: opening the aligned skin, sanding the R corner and its two sides by sandpaper at the bonding position between the rib and the fiber ply, and cleaning and drying the roughened positions with a vacuum cleaner in cooperation with a cleaning agent, and applying an adhesive on the R corner to form a rounded corner R after drying, and impregnating with fiber reinforcement after applying resin in the R area at the same time.

[0016] Further, step S6 includes: applying an adhesive with a preset thickness on one side of the fiber ply that contacts the aligned skin, and then aligning the skin, and curing and forming to achieve adhesive alignment.

[0017] Further, the adhesive includes an epoxy structural adhesive and an adhesive film, the rib includes a composite laminate, a sandwich structure and a metal plate, and the skin includes a composite laminated part, a sandwich part and a metal part.

[0018] Further, the debonding material includes a release agent, release wax, Teflon cloth and adhesive tape release cloth.

[0019] Further, the fibers of the fiber ply include glass fiber prepreg, carbon fiber prepreg, and carbon fiber and glass fiber impregnated with resin.

[0020] Further, the method of curing and forming includes room temperature curing and forming, oven curing and forming, drying room curing and forming and autoclave curing and forming.

[0021] The beneficial effects of the present invention are as follows:

[0022] The present invention uses fibers to strengthen the adhesive position, increases the adhesive area, and ensures the adhesive strength. At the same time, the adhesive thickness (i.e., the thickness of the adhesive) can be controlled by adjusting the thickness of the debonding material or the number of layers of the peel ply, so as to ensure better adhesive strength. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of Step 1 of the embodiment of the present invention.

[0024] Figure 2 It is a schematic diagram of Step 2 of the embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of Step 3 of the embodiment of the present invention.

[0026] Figure 4 It is a schematic diagram of Step 4 of the embodiment of the present invention.

[0027] Figure 5 It is a schematic diagram of Step 5 of the embodiment of the present invention.

[0028] Figure 6 It is a schematic diagram of Step 6 of the embodiment of the present invention. Detailed Embodiments

[0029] In order to have a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed embodiments of the present invention will now be described. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0030] This embodiment provides a process method for bonding and strengthening composite material panel ribs, including the following steps:

[0031] S1. Bond the rib to the skin through an adhesive and a positioning tooling or an adhesive and a rib occupancy line.

[0032] S2. Perform strengthening treatment at the bonding area between the rib and the skin, including grinding the R corner, cleaning, drying, coating with resin, and fiber layering for strengthening.

[0033] S3. Place a debonding material on the mating skin, and sequentially impregnate a preset number of layers of peelable cloth and fiber layering on the debonding material, and cure and form.

[0034] S4. Bond the fiber layering to the rib by positioning and mating two skins.

[0035] S5. Perform strengthening treatment at the bonding area between the rib and the fiber layering, including grinding the R corner, cleaning, drying, coating with resin, and fiber layering for strengthening.

[0036] S6. Apply an adhesive on the fiber layering and perform skin mating.

[0037] Preferably, the specific implementation of this process method is as follows.

[0038] As Figure 1 shown, use sandpaper (such as 60 - 200 mesh) to roughen the bonding positions of the ribs and the skin respectively, clean and dry the roughened positions with a cleaning agent. After drying, bond the ribs and the skin with an adhesive to a positioning tooling or with an adhesive to the rib occupation line, and then use a chamfering tool to form an R - angle on both sides of the extruded adhesive, and cure and form.

[0039] As Figure 2 shown, after the adhesive cures, use sandpaper (such as 60 - 200 mesh) to polish the R - angle and its two sides, and use a vacuum cleaner in cooperation with a cleaning agent to clean and dry the roughened positions. After drying, apply resin in the R - area and impregnate with fibers for strengthening.

[0040] As Figure 3 shown, place a debonding material on the mating skin, and sequentially impregnate a preset number of layers of peelable cloth and fiber plies on the debonding material, and cure and form.

[0041] As Figure 4 shown, the two skins are aligned through positioning. Before alignment, apply an adhesive with a preset thickness on the edge section where the rib contacts the mating skin, close the mold to bond the fiber ply on the mating skin to the rib, and cure and form.

[0042] As Figure 5 shown, open the mating skin. At the bonding position between the rib and the fiber ply, use sandpaper (such as 60 - 200 mesh) to polish the R - angle and its two sides, and use a vacuum cleaner in cooperation with a cleaning agent to clean and dry the roughened positions. After drying, apply an adhesive on the R - angle to form a rounded corner R, and at the same time apply resin in the R - area and impregnate with fibers for strengthening.

[0043] As Figure 6 shown, apply an adhesive with a preset thickness on one side of the fiber ply that contacts the mating skin, then close the mating skin, and cure and form to achieve bonded alignment.

[0044] As Figures 1 to 6 shown, in a process method for enhancing the bonding strength of the ribs of a reinforced composite material plate, fibers are used to strengthen the upper and lower bonding surfaces of the ribs, forming a structure similar to an "I" - shaped beam, greatly increasing the bonding contact area between the ribs and the skin, thus greatly enhancing the bonding strength between the ribs and the skin.

[0045] Preferably, the adhesive can be an epoxy structural adhesive and a film adhesive.

[0046] Preferably, the skin can be a composite material laminated part, a sandwich part, and a metal part.

[0047] Preferably, the ribs may be composite laminates, sandwich structures, and metal plates.

[0048] Preferably, the debonding material may be a release agent, release wax, Teflon cloth, and adhesive release cloth.

[0049] Preferably, the fibers of the fiber layup may be glass fiber prepregs, carbon fiber prepregs, or resin-impregnated carbon fibers and glass fibers.

[0050] Preferably, the curing and forming method may be room temperature curing and forming, oven curing and forming, curing and forming in a drying room, and autoclave curing and forming.

[0051] It should be noted that for the foregoing method embodiments, for the sake of simplicity of description, they are expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

Claims

1. A process method for bonding and strengthening the composite material sheet metal, characterized in that, It includes the following steps: S1. Bond the rib to the skin with an adhesive and a positioning tooling or with an adhesive and a rib placeholder line; S2. Strengthen the bonded part of the rib and the skin, including grinding the R corner, cleaning and drying, and impregnating with fiber after applying resin in the R area after drying; S3. Place a debonding material on the mating skin, and sequentially impregnate a preset number of layers of peel ply and fiber plies on the debonding material, and cure and form; S4. Align the two skins. Before alignment, apply an adhesive with a preset thickness on the edge section where the rib contacts the mating skin. Close the mold to bond the fiber ply on the mating skin to the rib, and cure and form; S5. Open the mating skin. At the bonded part of the rib and the fiber ply, grind the R corner and both sides with sandpaper, and clean and dry the roughened position with a vacuum cleaner and a cleaning agent. After drying, apply an adhesive on the R corner to form a rounded corner R, and at the same time, apply resin in the R area and impregnate with fiber for strengthening; S6. Apply an adhesive with a preset thickness on the side of the fiber ply that contacts the mating skin, then close the mating skin, and cure and form to achieve adhesive alignment.

2. The process method for bonding and strengthening the composite material plate rib according to claim 1, characterized in that, Step S1 includes: respectively grind and roughen the bonding positions of the rib and the skin with sandpaper, clean and dry the roughened positions with a cleaning agent, bond the rib to the skin with an adhesive and a positioning tooling or with an adhesive and a rib placeholder line after drying, and then use a chamfering tool to form an R corner on both sides of the rib with the extruded adhesive, and cure and form.

3. The process method for strengthening the bonding of composite material panel ribs according to claim 1, characterized in that, Step S2 includes: after the adhesive is cured, grind the R corner and both sides with sandpaper, and clean and dry the roughened positions with a vacuum cleaner and a cleaning agent. After drying, apply resin in the R area and impregnate with fiber for strengthening.

4. The process method for bonding and strengthening the composite material plate rib according to claim 1, characterized in that, The adhesive includes an epoxy structural adhesive and a film adhesive. The rib includes a composite laminate, a sandwich structure, and a metal plate. The skin includes a composite laminated part, a sandwich part, and a metal part.

5. The process method for adhesively strengthening the composite material panel rib according to claim 1, characterized in that, The debonding material includes a release agent, a release wax, a Teflon cloth, and a release cloth with adhesive.

6. The process method for bonding and strengthening the composite material panel rib according to claim 1, characterized in that, The fibers of the fiber ply include glass fiber prepreg and carbon fiber prepreg.

7. The process method for bonding and strengthening the composite material panel rib according to any one of claims 1-6, characterized in that, The method of curing and forming includes room temperature curing and forming, oven curing and forming, curing and forming in a drying room, and autoclave curing and forming.

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