CN117532922A - Repairing method for lightning protection layer on surface of composite material - Google Patents
Repairing method for lightning protection layer on surface of composite material Download PDFInfo
- Publication number
- CN117532922A CN117532922A CN202311811327.2A CN202311811327A CN117532922A CN 117532922 A CN117532922 A CN 117532922A CN 202311811327 A CN202311811327 A CN 202311811327A CN 117532922 A CN117532922 A CN 117532922A
- Authority
- CN
- China
- Prior art keywords
- lightning protection
- protection layer
- repairing
- composite material
- conductive material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000008439 repair process Effects 0.000 claims abstract description 44
- 239000000853 adhesive Substances 0.000 claims abstract description 34
- 230000001070 adhesive effect Effects 0.000 claims abstract description 34
- 239000004020 conductor Substances 0.000 claims abstract description 33
- 238000005498 polishing Methods 0.000 claims abstract description 17
- 239000011358 absorbing material Substances 0.000 claims abstract description 14
- 238000003892 spreading Methods 0.000 claims abstract description 13
- 230000007480 spreading Effects 0.000 claims abstract description 13
- 238000004140 cleaning Methods 0.000 claims abstract description 11
- 238000004806 packaging method and process Methods 0.000 claims abstract description 9
- 239000003292 glue Substances 0.000 claims abstract description 8
- 239000003973 paint Substances 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims description 55
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 244000137852 Petrea volubilis Species 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 3
- 239000011888 foil Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 3
- 229920000620 organic polymer Polymers 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 239000004636 vulcanized rubber Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010285 flame spraying Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
- B29C73/02—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D using liquid or paste-like material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
- B29C73/24—Apparatus or accessories not otherwise provided for
- B29C73/26—Apparatus or accessories not otherwise provided for for mechanical pretreatment
- B29C2073/262—Apparatus or accessories not otherwise provided for for mechanical pretreatment for polishing, roughening, buffing or sanding the area to be repaired
Abstract
The invention provides a method for repairing a lightning protection layer on the surface of a composite material, which comprises the following steps: polishing and cleaning the repair area, and protecting the non-repair area; spreading a layer of adhesive on the repair area, spreading a conductive material on the repair area, overlapping the conductive material and the original lightning protection layer by a preset length, compacting, spreading a glue absorbing material on the conductive material, equalizing the pressure by an equalizing plate to realize packaging, and vacuumizing and solidifying after the packaging is completed; and after the curing is finished, polishing and cleaning the redundant adhesive, and recovering the original paint layer.
Description
Technical Field
The invention relates to the technical field of aviation composite material manufacturing, in particular to a method for repairing a lightning protection layer on the surface of a composite material.
Background
The composite material has the characteristics of light weight, high strength, corrosion resistance, strong designability, integral forming, good fatigue fracture resistance and good dimensional stability, and becomes one of the main mechanism materials of the advanced aviation aircraft. Because the composite structure itself is less conductive than the metal structure, the composite structure surface typically has an aluminum coating or metal mesh as a lightning strike protection layer. In the use or service process of the composite material structure, the lightning protection layer is easy to damage, and the repair after the damage is required to meet the aerodynamic profile requirements besides meeting the surface lightning protection requirements, so that the repair of the lightning protection layer is difficult.
At present, the repair of the lightning protection layer on the composite material surface of the aviation aircraft generally adopts a flame spraying aluminum repair or metal mesh composite film adhesive repair mode, the repair process is complex, the equipment requirement is high, and the external field repair of the aircraft is not facilitated.
Therefore, the method for repairing the lightning protection layer on the surface of the composite material is designed, the method has the advantages of relatively simple flow, relatively short repair time, low equipment requirement, suitability for external field repair, capability of ensuring the requirements of lightning protection and aerodynamic appearance of the surface, and difficulty and urgency in realization at present.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problems that the existing repairing method has long repairing time and high equipment requirement on the premise of ensuring the surface lightning protection and aerodynamic shape requirements.
(II) technical scheme
In order to achieve the above purpose, the invention adopts the following technical scheme:
the method for repairing the lightning protection layer on the surface of the composite material is used for repairing a repairing area formed by the damaged lightning protection layer on the surface of the composite material and the peripheral area of the damaged lightning protection layer, and comprises the following steps:
polishing and cleaning the repair area, and protecting the non-repair area;
spreading a layer of adhesive on the repair area, spreading a conductive material on the repair area, overlapping the conductive material and the original lightning protection layer by a preset length, compacting, spreading a glue absorbing material on the conductive material, equalizing the pressure by an equalizing plate to realize packaging, and vacuumizing and solidifying after the packaging is completed;
and after the curing is finished, polishing and cleaning the redundant adhesive, and recovering the original paint layer.
Further, the polishing and cleaning the repair area comprises the following specific steps:
polishing the damaged lightning protection layer by using sand paper to remove resin, paint layer and dirt remained on the surface;
polishing the damaged lightning protection layer and the peripheral area with the boundary 10mm-30mm larger than the boundary of the damaged lightning protection layer, and dipping acetone into gauze to clean.
Further, after the conductive material is laid in the repair area, the conductive material is pressed by a pressing roller to compact the conductive material and eliminate interlayer bubbles.
Further, the adhesive is an adhesive capable of being cured at normal temperature or an adhesive capable of being cured at 60-80 ℃.
Further, the conductive material is an organic polymer composite conductive film, or a metal copper mesh, or a metal aluminum mesh, or a copper foil, or an aluminum foil.
Further, the glue absorbing material is polytetrafluoroethylene glass cloth or peelable cloth.
Further, the equalizing plate is a glass fiber reinforced plastic equalizing plate, and the thickness of the equalizing plate is 0.3mm-0.5mm.
Further, the equalizing plate is a vulcanized rubber equalizing plate, and the thickness of the equalizing plate is 1mm-2mm.
Further, the maximum protrusion of the outer surface profile of the repair area is not more than 0.30mm.
Further, before the pressure equalizing plate is adopted for equalizing pressure, an isolating film is placed on the adhesive absorbing material.
(III) beneficial effects
The technical scheme of the invention has at least the following advantages:
the invention provides a method for repairing a lightning protection layer on the surface of a composite material, which adopts a combination mode of various adhesives and conductive materials, has low requirement on repair materials and strong applicability, can be cured at normal temperature or by heating, has little limit on repair equipment, adopts an adhesive absorbing material to absorb redundant adhesives and adopts a pressure equalizing plate at the same time, can maximally ensure the electrical connection between the repaired conductive layer and the original lightning protection layer and meet the pneumatic appearance requirement, has simple whole repair flow, is convenient to operate, and is suitable for the rapid and efficient repair of the lightning protection layer on the outer surface of the composite material structure of an aircraft.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an implementation of a method for repairing a lightning protection layer on a composite material surface according to an embodiment of the present invention.
The reference numerals in the drawings are as follows:
1. a composite surface; 2. a damaged lightning protection layer; 3. an adhesive; 4. a servo cylinder; 5. a mobile platform; 6. a second nut; 7. a guide rod; 8. a lighting lamp; 9. a pressing disc; 10. a force sensor pressure cap; 11. a force sensor; 12. a sensor transfer pad; 13. a positioning pin; 14. a large gasket; 15. a second disc spring; 16. a first nut; 17. a gasket; 18. a second screw; 19. a guide bushing; 20. a T-shaped sleeve; 21. an anti-rotation block; 22. a third screw; 23. an adjustment pad; 24. a plug; 25. a first screw; 26. a first disc spring; 51. a second through hole; 91. a mounting groove; 92. a first through hole; 101. an inner groove; 111. and a connection hole.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected or indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing the invention based on the orientation or positional relationship shown in the drawings, and are not to be construed as limiting the invention, as the indicating device or element must have a particular orientation, be constructed and operated in a particular orientation.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating relative importance or indicating the number of technical features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. The following describes in more detail the specific implementation of the present invention in connection with specific embodiments:
as shown in fig. 1, an embodiment of the present invention provides a method for repairing a lightning protection layer on a surface of a composite material, which is used for repairing a repair area formed by a damaged lightning protection layer 2 and a peripheral area thereof on the surface 1 of the composite material, and includes the following steps:
polishing and cleaning the repair area, and protecting the non-repair area;
spreading a layer of adhesive 3 on the repair area, spreading a conductive material 4 on the repair area, overlapping the conductive material 4 and the original lightning-proof layer by a preset length, compacting, spreading a glue absorbing material 5 on the conductive material 4, placing a breathable material 8 on a pressure equalizing plate, placing a vacuum bag 9 on the breathable material 8, and vacuumizing and curing through the vacuum bag 9. After equalizing pressure by adopting an equalizing plate 7, packaging is realized, and vacuumizing and solidifying are carried out after packaging is completed; in particular, in
And after the curing is finished, polishing and cleaning the redundant adhesive 3, and recovering the original paint layer.
In one embodiment, polishing and cleaning the repair area includes the following specific steps:
polishing the damaged lightning protection layer 2 by sand paper, and removing resin, paint layer and dirt remained on the surface to fully expose the original lightning protection layer;
the damaged lightning protection layer 2 and the peripheral area with the boundary 10mm-30mm larger than the damaged lightning protection layer are polished, and the peripheral area is dipped in acetone by gauze and is wiped clean.
In one embodiment, after the conductive material 4 is laid down in the repair area, the conductive material 4 is pressed using a pressing roller to compact the conductive material 4 and to exclude interlayer bubbles.
In one embodiment, the adhesive 3 is an adhesive that is curable at normal temperature or an adhesive that is curable at 60-80 ℃. In particular, the choice may be made in terms of repair equipment, site restrictions and repair time limits.
In one embodiment, the conductive material 4 is an organic polymer composite conductive film, or a metal copper mesh, or a metal aluminum mesh, or a copper foil, or an aluminum foil, and the thickness of the conductive material 4 is not greater than 0.20mm.
In one embodiment, the glue absorbing material 5 is polytetrafluoroethylene glass cloth or peelable cloth.
In one embodiment, the equalizing plate 7 is a glass fiber reinforced plastic equalizing plate, and the thickness of the equalizing plate 7 is 0.3mm-0.5mm.
In one embodiment, the equalizing plate 7 is a vulcanized rubber equalizing plate, and the thickness of the equalizing plate 7 is 1mm-2mm.
In one embodiment, the repair area has an outer surface profile that has a maximum protrusion of no more than 0.30mm.
In one embodiment, a release film 6 is placed over the suction material 5 before the pressure is equalized using the equalizing plate 7.
Referring to fig. 1, the implementation procedure of the present embodiment is as follows:
in the specific implementation process, firstly, the damaged lightning protection layer 2 on the surface 1 of the composite material is polished by sand paper, resin, paint layer and dirt remained on the surface are removed, the boundary of a polished area is 10mm-30mm larger than the boundary of the damaged lightning protection layer 2, and the polished area is cleaned by dipping acetone by gauze, and then a non-repair area is protected. And then uniformly scraping the prepared adhesive 3 to the whole repair area by using a blade, cutting the conductive material 4 according to the size of the repair area, spreading and laying the conductive material 4 on the adhesive 3 of the repair area, and pressing the conductive material 4 by using a pressing roller to play roles of compacting and removing bubbles, thereby ensuring that the conductive material does not slip and is not wrinkled during the process. The edges of the conductive material 4 are then secured with tape to prevent slippage of the conductive material 4 during subsequent operations. Then, the adhesive absorbing material 5, the isolating film 6, the equalizing plate 7, the ventilation material 8 and the vacuum bag 10 are sequentially placed, the adhesive absorbing material 5 is placed between the conductive material 4 and the isolating film 6, and the adhesive absorbing material 5 plays roles in adhesive absorption and ventilation. The adhesive 3 may be cured by heating with an electric baking lamp or a heating blanket, and if an electric blanket is used for heating, the electric blanket needs to be placed between the pressure equalizing plate 7 and the ventilation material 8. Vacuumizing after packaging is completed, and curing according to the selected adhesive 3 at normal temperature or heating to 60-80 ℃. After the curing of the adhesive 3 is completed, the vacuum bag 9, the breathable material 8, the uniform plate 7, the isolation film 6 and the adhesive absorbing material 5 are removed in sequence. And finally, polishing the surface of the repair area with sand paper to obtain the residual glue.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The method for repairing the lightning protection layer on the surface of the composite material is used for repairing a repairing area formed by the damaged lightning protection layer on the surface of the composite material and the peripheral area of the damaged lightning protection layer, and is characterized by comprising the following steps:
polishing and cleaning the repair area, and protecting the non-repair area;
spreading a layer of adhesive on the repair area, spreading a conductive material on the repair area, overlapping the conductive material and the original lightning protection layer by a preset length, compacting, spreading a glue absorbing material on the conductive material, equalizing the pressure by an equalizing plate to realize packaging, and vacuumizing and solidifying after the packaging is completed;
and after the curing is finished, polishing and cleaning the redundant adhesive, and recovering the original paint layer.
2. The method for repairing the lightning protection layer on the surface of the composite material according to claim 1, wherein the step of polishing and cleaning the repaired area comprises the following specific steps:
polishing the damaged lightning protection layer by using sand paper to remove resin, paint layer and dirt remained on the surface;
polishing the damaged lightning protection layer and the peripheral area with the boundary 10mm-30mm larger than the boundary of the damaged lightning protection layer, and dipping acetone into gauze to clean.
3. The method for repairing a lightning-proof layer on a composite material surface according to claim 1, wherein after the conductive material is laid on the repair area, the conductive material is pressed by a pressing roller to compact the conductive material and eliminate interlayer bubbles.
4. The method for repairing a lightning-proof layer on a surface of a composite material according to claim 1, wherein the adhesive is an adhesive capable of being cured at normal temperature or an adhesive capable of being cured at 60-80 ℃.
5. The method for repairing the lightning protection layer on the surface of the composite material according to claim 1, wherein the conductive material is an organic polymer composite conductive film, a metal copper mesh, a metal aluminum mesh, a copper foil or an aluminum foil.
6. The method for repairing a lightning protection layer on a composite material surface according to claim 1, wherein the glue absorbing material is polytetrafluoroethylene glass cloth or peelable cloth.
7. The method for repairing the lightning protection layer on the surface of the composite material according to claim 1, wherein the pressure equalizing plate is a glass fiber reinforced plastic pressure equalizing plate, and the thickness of the pressure equalizing plate is 0.3mm-0.5mm.
8. The method for repairing the lightning protection layer on the surface of the composite material according to claim 1, wherein the pressure equalizing plate is a vulcanized rubber uniform plate, and the thickness of the pressure equalizing plate is 1mm-2mm.
9. The method for repairing a lightning-proof layer on a surface of a composite material according to claim 1, wherein the maximum protrusion of the outer surface profile of the repaired area is not more than 0.30mm.
10. The method for repairing the lightning protection layer on the surface of the composite material according to claim 1, wherein a separation film is placed on the adhesive absorbing material before the pressure equalization by the equalizing plate is adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311811327.2A CN117532922A (en) | 2023-12-26 | 2023-12-26 | Repairing method for lightning protection layer on surface of composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311811327.2A CN117532922A (en) | 2023-12-26 | 2023-12-26 | Repairing method for lightning protection layer on surface of composite material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117532922A true CN117532922A (en) | 2024-02-09 |
Family
ID=89784504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311811327.2A Pending CN117532922A (en) | 2023-12-26 | 2023-12-26 | Repairing method for lightning protection layer on surface of composite material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117532922A (en) |
-
2023
- 2023-12-26 CN CN202311811327.2A patent/CN117532922A/en active Pending
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