A gas-assisted laser processing method for removing stealth coatings on aircraft surfaces

A gas-assisted, aircraft surface technology, used in metal processing equipment, laser welding equipment, manufacturing tools, etc., can solve problems such as large environmental pollution, hidden dangers, fire safety, etc., to improve processing quality, not damage the substrate, and ensure safety. Effect

Active Publication Date: 2022-05-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the laser removal of stealth coatings, due to the requirements of the material’s absorbing properties, the coatings are generally thicker, up to mm level, and a large number of sparks caused by excessive ablation often occur during the removal process, which is more polluting to the environment. Deadly is a fire safety hazard

Method used

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  • A gas-assisted laser processing method for removing stealth coatings on aircraft surfaces

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The gas-assisted laser processing method for removing the stealth coating on the surface of the aircraft of the present invention is as follows:

[0031] The first step is to wire cut the 12024 aluminum alloy aluminum alloy sample to be treated with the stealth coating 2 on the surface to a suitable size, fix it on the working platform through a clamp, and align the coated side with the laser cleaning head 3;

[0032] The second step is to turn on the switch of the gas-assisted protection device, and inject helium gas from the main protective gas inlet and the tail protective gas inlet to form a uniform gas protective layer on the surface area of ​​the stealth coating;

[0033] The third step, using 100W CO 2 The laser removes the stealth coating, and the high-speed movement of the X and Y galvanometers applies the laser energy to the coating surface in a two-dimensional arrangement. A circular laser spot of 5 mm is selected for laser processing, the laser wavelength i...

Embodiment 2

[0038] The first step is to cut the 7075 aluminum alloy wire coated with stealth coating to a suitable size, fix it on the working platform through the clamp, and align the coated side with the laser cleaning head;

[0039] The second step is to turn on the switch of the gas-assisted protection device, and pass neon gas from the main protective gas inlet and the tail protective gas inlet to form a uniform gas protective layer on the surface area of ​​the stealth coating;

[0040] In the third step, a 300W Nd:YAG laser is used to remove the stealth coating. The high-speed movement of the X and Y galvanometers applies the laser energy to the coating surface in a two-dimensional arrangement. A 10mm circular laser spot is selected for laser processing, the laser wavelength is 1064nm, and the output power is 80%. The pulse width is set to 6ns, and the pulse frequency is set to 30Hz. The stealth coating is removed by point-by-point, line-by-line, and surface-by-surface laser scanni...

Embodiment 3

[0044] The first step is to cut the TC4 titanium alloy wire coated with stealth coating to a suitable size, fix it on the working platform through the fixture, and align the coated side with the laser cleaning head;

[0045] The second step is to turn on the switch of the gas-assisted protection device, and argon gas is introduced from the main protective gas inlet and the tail protective gas inlet to form a uniform gas protective layer on the surface area of ​​the stealth coating;

[0046] In the third step, a 500W fiber laser is used to remove the stealth coating. The high-speed movement of the X and Y galvanometers applies the laser energy to the coating surface in a two-dimensional arrangement. A 2mm circular laser spot is selected for laser processing, the laser wavelength is 1030nm, and the output power is 30%. The pulse width is set to 200ns, and the pulse frequency is set to 200kHz. The stealth coating is removed by point-by-point, line-by-line, and surface-by-surface...

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Abstract

The invention discloses a gas-assisted laser processing method for removing a stealth coating on the surface of an aircraft, which comprises the following steps: 1) fixing the aircraft surface sample to be treated with a stealth coating on the surface on a working platform, covered with One side of the coating is aimed at the laser cleaning head; 2) the gas-assisted protection device includes a main device and a tail device, and an inert gas is introduced from the protective gas inlet to form an inert gas protective layer on the surface area of ​​the stealth coating; 3) adopt Pulse laser to remove the stealth coating; 4) Turn off the laser and the gas-assisted protection device, clean up the residual waste on the surface of the sample, and take out the sample; 5) If the stealth coating is not completely removed, repeat the above steps 1) to 4 ). The technology of the invention has the advantages of high precision, fast and high efficiency, no damage to the substrate, and can be used for large-area removal; the safety of the laser removal process is guaranteed through the gas-assisted protection device, and the removal quality of the stealth coating on the aircraft surface is effectively improved.

Description

technical field [0001] The invention relates to the technical field of advanced laser manufacturing of aircraft surfaces, in particular to a gas-assisted laser processing method for removing stealth coatings on aircraft surfaces. Background technique [0002] Stealth technology is the latest achievement of contemporary advanced science and technology, and it is of great significance in military affairs. Coating stealth coatings on the surface of weaponry can reduce radar, infrared, audio and other optical, electrical, magnetic and other characteristic signals, making it difficult for weaponry to be discovered, tracked, identified and attacked, and can effectively improve the penetration performance of weaponry and survivability. However, after a long period of service, the stealth coating will gradually fail due to aging, cracking or even falling off. Therefore, after a certain period of service, the stealth coating on the surface of the weapon must be quickly removed and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/36B23K26/70
CPCB23K26/36B23K26/702
Inventor 沈一洲舒送陶杰程宗辉何兆儒黄昕
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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