Method for repairing damage of composite aramid paper honeycomb core in external field low-temperature environment
A composite material, low temperature environment technology, applied in the field of aircraft composite material repair, can solve the problems of uneven bonding quality, difficult honeycomb grinding, uneven temperature field, etc., saving time and solving the problem of uneven heating in repair , the effect of reducing the difficulty of implementation
Inactive Publication Date: 2020-12-04
国营芜湖机械厂
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Problems solved by technology
[0003] The traditional repair method removes the damaged honeycomb core and makes it into a regular cylindrical shape, uses medium temperature or high temperature curing foam glue to bond the new aramid paper honeycomb core block to restore, and polishes the panel into a mitered or stepped shape, using the original panel material Curing and repairing at medium temperature or high temperature, this method has certain disadvantages: First, under low-temperature external field conditions, due to the influence of the characteristics of the honeycomb lattice structure, heat is easily lost during the heating process, and the temperature field in the curing area when the temperature rises to medium or high temperature Unevenness, resulting in uneven bonding quality. Second, regular shape panels and honeycomb polishing are difficult and inefficient
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[0038] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.
[0039] A method for repairing the damage of the composite aramid paper honeycomb core in an external low-temperature environment, the specific steps are as follows:
[0040] (1) Confirm the debonding area of the damaged part of the rudder, mark it with a soft colored pen, and complete the excavation and repair of the panel of the damaged area by using the vertical excavation process, and clean it up.
[0041] Specifically, use ultrasonic A-scan or C-scan to confirm the debonding area of the rudder damage; figure 1 As shown, it is a schematic diagram of the area where the skin needs to be spot faced in the present invention. By using a circular corundum casing drill installed on a pneumatic pneumatic drill, perpendicular t...
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Abstract
The invention relates to a method for repairing damage of a composite aramid paper honeycomb core in external field low-temperature environment. The method comprises the following specific steps of confirming the debonding area of a damaged part of a rudder, performing marking by using a color soft pen, completing patching of a panel in a damaged area by adopting a vertical digging process, and performing cleaning; enabling the cleaned damaged area to be filled with J-293 low-temperature curing foaming filler, and performing heating and curing; and uniformly coating J-350-1 structural adhesiveon a bonding interface of a pre-cured circular carbon fiber patch, and then bonding the pre-cured circular carbon fiber patch on the filler in the damaged area. According to the method, the damaged aramid fiber honeycomb core is repaired through the low-temperature curing filler, a vertical patching method is adopted for the damaged panel, and compared with a traditional repairing method for replacing honeycombs or conducting inclined connection or step polishing on the panel, the method has the advantages that on one hand, the problem that aramid paper honeycomb core repairing and heating are uneven in the external field low-temperature environment is solved, and the cementing quality is improved; and on the other hand, the vertical patching method is used, implementation difficulty is reduced, operation is easy, and time is saved.
Description
technical field [0001] The invention relates to the technical field of repairing aircraft composite materials, in particular to a method for repairing damage to composite aramid paper honeycomb cores in an external low-temperature environment. Background technique [0002] Composite materials have excellent characteristics such as high specific strength and specific stiffness, strong designability, good fatigue performance, corrosion resistance, and light weight, and are widely used in aircraft structures, including flaps, ailerons, spoilers, rudders and other components Extensive use of aramid paper honeycomb core. During the service of the aircraft, the aramid paper honeycomb core of the sandwich structure will inevitably suffer from damage such as collapse and cracking. [0003] The traditional repair method removes the damaged honeycomb core and makes it into a regular cylindrical shape, uses medium temperature or high temperature curing foam glue to bond the new aramid...
Claims
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Login to View More IPC IPC(8): B29C70/44B29C70/54
CPCB29C70/44B29C70/54
Inventor 刘金生宣善勇孙运刚陈康邱蕾蕾
Owner 国营芜湖机械厂