| JIANG Suhang,LI Duosheng,YE Yin,XIE Feitong,QIU Yanqin,ZHONG Hongping.Experimental and Numerical Study on Laser One-time Removal of Aluminium Alloy Aircraft Skin Coating[J],53(9):180-189 |
| Experimental and Numerical Study on Laser One-time Removal of Aluminium Alloy Aircraft Skin Coating |
| Received:February 20, 2023 Revised:September 08, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.09.017 |
| KeyWord:laser cleaning nanosecond pulsed laser aluminum alloy aircraft skin one-time removal orthogonal experimental method |
| Author | Institution |
| JIANG Suhang |
Nanchang Hangkong University, Nanchang , China |
| LI Duosheng |
Nanchang Hangkong University, Nanchang , China |
| YE Yin |
Nanchang Hangkong University, Nanchang , China |
| XIE Feitong |
Nanchang Hangkong University, Nanchang , China |
| QIU Yanqin |
Nanchang Hangkong University, Nanchang , China |
| ZHONG Hongping |
Nanchang Hangkong University, Nanchang , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to study the effect of three parameters such as frequency, power and scanning speed of the pulsed laser on cleaning of the paint coating (S06-0215) on the surface of aluminum alloy aircraft skin in detail, then analyze the mechanism of pulsed laser cleaning, and finally optimize the combination of process parameters and designed one-time removal method for removing the paint coating of aircraft skin. Aerospace aluminum alloy (2A12) was used as the substrate, and the frequency, power and scanning speed of pulsed laser were optimized by orthogonal design. The optimized process parameters were applied to simulate the final ablation depth of the substrate surface coating and the maximum temperature of the substrate surface during the ablation process, and then the surface roughness and removal depth after cleaning were used as evaluation criteria to judge the effect on cleaning of the aluminum alloy aircraft skin coating. The orthogonal experiments were carried out to optimize the removal parameter combination, and the final combination of parameters was used to measure the roughness of the cleaned skin surface. Next, the microscopic morphology and element content were analyzed. The simulation and experimental results showed that the ablation was dominant effect, which was the main removal mechanism. With scanning speed and frequency increasing, the removal mechanism dominated by ablation gradually weakened, while the vibration mechanism gradually increased and eventually became dominant. The energy density of the pulsed laser was determined by the power and frequency, and it was proportional to the power and inversely proportional to the frequency. The energy density of the laser and the scanning speed together determined the quality of the cleaned surface. When energy density was small, the depth of laser cleaning was shallow. With energy density increasing, the thermal impact of the laser range was larger, and the depth of cleaning was also deeper. The frequency of the laser had a certain effect on the surface roughness after cleaning. The greater the frequency, the greater the number of laser actions per unit of time and the more obvious the vibration effect. The weight order of parameters affecting laser removal depth was as follows:scanning speed > laser power > pulse frequency. It was found that when laser frequency was 125 kHz, power was 70 W and speed was 50 mm/s, it was the best one-time removal process parameter combination for cleaning the surface coating (S06-0215), namely that energy density was 1.47 J/cm2 after cleaning. Under this parameter, not only the skin surface coating could be completely removed, but also the substrate surface oxide film could be completely retained to achieve the non-destructive cleaning effect. At that time, no special elements of coating and substrate were found on the micro-surface after cleaning, and the macro-surface roughness was lower than that before cleaning. Therefore, this study effectively combines the optimized parameters of orthogonal experiment with the predicted results of simulation, and innovatively develops a novel efficient laser cleaning method to remove the coating of aircraft skin at one-time, which provides an important reference for the development of new efficient and accurate laser cleaning of multi-layer coating. |
| Close |
|
|
|