Double-laser cleaning device and method thereof

Abstract

The invention provides a double-laser cleaning device. The double-laser cleaning device comprises a double-laser-beam dynamic combination device, wherein two laser beams are input into the double-laser-beam dynamic combination device, and the double-laser-beam dynamic combination device is used for outputting variable-interval parallel lasers which are emitted into the surface of a workpiece. Thetwo laser beams are emitted into a prism reflector through a first reflector and a second reflector, and the parallel lasers with variable intervals are output through the prism reflector in a translation mode. According to the double-laser cleaning device, the complex to-be-removed object on the surface of a substrate is efficiently removed through the two laser beams with different pulse widths,the first laser beam is used for cleaning most of the surface to-be-removed objects by using the long pulse width laser parameters, the second laser beam is used for using the short pulse width laserparameters, and the residual object to be removed is completely cleaned by utilizing the heat accumulation of the first laser beam, so that the laser cleaning efficiency is greatly improved, the energy is saved, the surface of the ablated substrate is effectively prevented from being ablated, and the surface quality of the substrate after laser cleaning is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of laser cleaning, in particular to a dual laser cleaning device and a method thereof. Background technique [0002] With the rapid development of laser cleaning technology, this new type of cleaning technology is more and more widely used in industries to remove rust or paint layers on metal surfaces due to its more efficient and environmentally friendly advantages. At present, laser cleaning of aircraft skin surface coatings is facing technical difficulties. Due to the complexity of the coating system on the surface of the aircraft skin, mainly including the pretreatment layer of the skin base material, the primer layer, and the topcoat layer, it is necessary to remove all the surface coatings during aircraft overhaul, not only for the purpose of recoating new coatings. The layer is used to detect defects or fatigue cracks on the skin surface and repair them, so as to avoid accidents caused by fatigue dam...

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Problems solved by technology

For example, the Chinese invention patent discloses a laser processing method and equipment for removing thin films or coatings. This method first measures the thickness of the thin film or coating, and then adjusts the laser parameters for cleaning according to the obtained thickness value, and repeats the previous steps. Scan the laser on the surface of the film or coating until the film or coating is removed. This method measures the thickness of the film or coating in real time and adjusts the laser parameters to achieve the optimal removal effect, fast and accurate, but this method Scanning the same area at least twice during the cleaning process is inefficient and therefore not suitable for large-scale industrial applications

A Chinese invention patent discloses a laser removal device and method for the oxide layer on the steel plate surface. In this invention, the steel plate is placed horizontally on a carrying platform that can move back and forth, and multiple beam splitters are used to split the horizontal laser beam and reflect it downward. , the derusting head is in one-to-one correspondence with multiple spectroscopic mirrors and the reflected light is focused and scattered on the surface of the steel plate. The multiple derusting heads are distributed in an array perpendicular to the moving direction of the steel plate, so that the entire surface of the steel plate is uniform during the moving process. Covered by lasers scattered by multiple derusting heads, this method greatly increases the area of ​​laser cleaning, but cannot accurately guarantee the cleaning effect, and cannot clean large curved surfaces such as aircraft skins or ship hulls. The scope of application is limited to laser on flat plates to clean

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