Views: 0 Author: HanTenCNC Publish Time: 2021-12-22 Origin: Site
Laser cleaning is an emerging material surface cleaning treatment technology that can replace traditional pickling, sandblasting and high-pressure water gun cleaning. The laser cleaning machine adopts a portable cleaning head and a fiber laser. It has flexible transmission, good controllability, wide applicable materials, high efficiency and good effect. In recent years, it has been widely used in rail transportation, petroleum and petrochemical, automobile molds and other fields.
The essence of laser cleaning is the process of using the high energy density of the laser to destroy the contaminants attached to the surface of the substrate without damaging the substrate. According to the analysis of the optical characteristics of the cleaned substrate and the contaminants, the laser cleaning mechanism can be divided into two categories: One is to use the difference in the absorption rate of the contaminant and the substrate to a certain wavelength of laser energy to make the laser energy fully absorbed. The pollutants are absorbed, so that the pollutants are heated to expand or vaporize and volatilize. The other is that there is little difference in the absorption rate of the laser from the substrate and the pollutant. A high-frequency, high-power pulsed laser is used to impact the surface of the object. The shock wave causes the pollutant to burst and separate from the surface of the substrate.
Rust removal, paint removal, oil removal and oxide removal of metal surfaces are currently the most widely used areas of laser cleaning. Floating rust removal requires the lowest laser power density, which can be achieved by using ultra-high-energy pulsed lasers or even continuous lasers with poor beam quality. In addition to the dense oxide layer, it is generally necessary to use a near-single-mode MOPA laser with a higher power density and a pulse energy of about 1.5 mJ. For other contaminants, suitable light sources should be selected according to their light absorption characteristics and the ease of cleaning.