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A method for repairing an aero-engine composite casing

An aero-engine and composite material technology, applied in the field of composite material repair, can solve the problems of waste of resources, large casing volume, complex structure and shape, etc., and achieve the effect of preventing further expansion and simple process

Active Publication Date: 2019-01-04
国营川西机器厂
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operating temperature of the engine casing is 200~280°C. Traditional resin prepregs are difficult to meet the temperature resistance requirements, and the casing is large in size and complex in shape and cannot realize key processes such as heating, pressurization, and vacuum heating during the curing process.
Therefore, the existing technology cannot realize the repair of the composite casing of the aero-engine, resulting in the casing being severely damaged and cannot be reused many times, resulting in a waste of resources

Method used

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  • A method for repairing an aero-engine composite casing
  • A method for repairing an aero-engine composite casing
  • A method for repairing an aero-engine composite casing

Examples

Experimental program
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Embodiment 2

[0049] When a certain type of aero-engine was being repaired, it was found that there was an ablation area on the inner surface of the casing, and the ablation penetrated in the thickness direction, and the inner surface and the outer surface were simultaneously repaired according to the method provided by the present invention. The specific operation steps are as follows:

[0050] S1. Check the degree of damage to the composite casing, and measure the size and shape of the defect. The size of the damaged area is about 90 mm×40 mm, and it penetrates in the thickness direction. The schematic diagram is as follows Figure 7 shown.

[0051] S2. Carry out smooth transition grinding on the damaged area with a rotating grinding head, remove the damaged area, the grinding depth is about 1.4mm, wash with acetone and then dry. The depth of the defect exceeds half of the original thickness (2 mm), so repairs with metal reinforcement sheets are required on both sides. Drill 6 holes evenl...

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Abstract

The invention relates to a repair method of a composite aeroengine casing. The repair method comprises the following operating steps: S1, detecting the damage degree of the aeroengine casing to be repaired; S2, performing pretreatment on the repairing area; S3, drilling the pretreatment area; S4, determining the area of a titanium alloy metal reinforcing piece; S5, performing profile modeling on the titanium alloy metal reinforcing piece; S6, drilling the titanium alloy metal reinforcing piece; S7, comparing the damage depth with the original thickness of the workpiece; and S8, riveting the titanium alloy metal reinforcing piece on the aeroengine casing. The repair method of the composite aeroengine casing has the benefits as follows: the repair speed is high, the profiling titanium alloy metal reinforcing piece is adopted for repair, that the titanium alloy metal reinforcing piece is in close fit with the repair area of the aeroengine casing is ensured, the damaged area of the aeroengine casing is effectively prevented from being expanded, the process is simple, heating curing equipment is not needed, and the method is suitable for outfield repair.

Description

technical field [0001] The invention relates to composite material repair application technology, in particular to a method for repairing a composite material casing of an aero-engine. Background technique [0002] Composite materials have been widely used in the field of aero-engines because of their high specific strength and specific modulus, creep resistance, and corrosion resistance. Advanced engines in various countries use composite material casings to replace the original titanium alloy casings. Composite casings are inevitably impacted by foreign objects during long-term service, and abnormal gas produces high-temperature gas erosion, which often leads to ablation defects on the inner surface. Especially under the impact of foreign matter, damage and local buckling will occur, resulting in a decrease in the strength and rigidity of the casing. [0003] The aero-engine composite casing is a laminate structure, but because of its cylindrical structure, it brings cert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P6/00
CPCB23P6/002
Inventor 张铀徐春刘俊伶黄璇璇张良成彭中亚何勇姚改成杨震
Owner 国营川西机器厂
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