Application Research of Laser Cleaning Technology for Infrared and Laser Engineering Military Equipment Hou Suxia 12, Luo Jijun, Xu Jun, Zhang Qinghua1 (1. Second Artillery Engineering College, Xi'an 710025, China; 2. Department of Nuclear Energy Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China). Based on the analysis of the laser cleaning mechanism, it was designed.
There is a C2 laser for energy output; a He-Ne laser is divided into two parts by a beam splitter, one part is used for alignment with the optical path, and the other is used to detect the cleaning quality of the plug core; For laser beam expansion to improve work efficiency, adding a stop at the output end of the telescope system to improve the mode and beam diameter of the output light; a coaxial blowing nozzle for blowing the mold vapor and The protective optical system is not contaminated by it; one fixture is used to fix the laser and the plug to be washed; and one laser protective glasses is used for the safety protection of the operator.
2.2 Experimental analysis Using the device to carry out cleaning experiments on the underground control tunnel optical cable of a certain base, the experimental data are shown in Table 1. In Table 1, the cleaning effect is mainly to monitor the cleaning process in real time by acoustic emission meter (Model AESM). The judgment made by the acoustic emission signal. The material of the No. 9 cable has been seriously deteriorated, resulting in failure of cleaning. The cleaning effect of the other 9 cables is better than the above.
The choice of energy requires the selection of the largest possible power density without damaging the plug to improve cleaning efficiency. According to the analysis, the weakest part of the plug that receives the laser energy is the insulating material of the plug, so the laser power density must be lower than the damage threshold of the insulating material, and the laser energy must be higher than the cleaning threshold of the mold. For the pin-hole inner hole of the ten connector, the beam will produce a beam-like channel effect in the laser drilling process, so that the reflection loss is reduced or even lost. In the hole, due to multi-level reflection, the light energy is fully absorbed by the mold, and the hole is like a trap of the beam, which can improve the laser cleaning efficiency, and can reduce the laser energy density, reduce the hole wall and insulation while ensuring the cleaning effect. The thermal impact of the material.
In the process of laser cleaning of mold, the time of receiving laser irradiation in different parts of the plug is not the same, and the growth of mold has an influence on the irradiation time of each part. The part that receives the longest laser irradiation time is the head of the plug core. Since the head of the plug core is a conical aluminum-based material, the laser energy is absorbed little, so it will not be damaged. Followed by the insulation material of the base, in order to adapt to the welding environment of the cable, the insulating material is a high temperature resistant material (the rubber high temperature value G>0), the instantaneous high power laser used to remove the mold will not cause damage, and the insulating material is located At the bottom of the plug, when the amount of mold is large and the irradiation time is long, the amount of laser irradiation received by the insulating material does not increase significantly due to the scattering and reflection of the mold.
The switch of the laser is precisely controlled according to the cleaning rate of the plug to reduce the thermal influence on the base insulating material. The cleanliness of the plug can be measured by the scattering of the He-Ne laser energy by the plug core and the acoustic signal generated by laser cleaning of the mold. The exact vertical alignment of the laser beam is done by a He-Ne laser, and the relative position of the fixture is required to be constant and perpendicular to each other to reduce the unnecessary thermal effects of the laser on other parts.
3 Discussion In order to ensure the cleaning effect and safety and reliability, the power of the selected C2 laser is determined by theoretical estimation and repeated experiments. Issues to be considered in the design: energy selection, choice of scanning time, absorption properties of insulating materials and molds, precise control of laser switches, measurement of plug cleanliness, accurate vertical alignment of laser beams, these further the study. As an important application field, laser cleaning technology has the following characteristics compared with traditional cleaning methods such as mechanical and chemical: cleanliness is much higher than chemical cleaning process; applicable substrate range is wide; by adjusting laser process parameters, without damage On the basis of the surface of the material, the rust can be effectively removed, and the surface of the workpiece can be renewed as new; the laser cleaning equipment can be used multiple times, and the running cost is low. The application of laser cleaning in equipment maintenance is becoming more and more important.
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