Today, with the rapid development of laser cleaning technology, new directions and trends are constantly emerging in the field. Among them, laser composite cleaning technology is one of the directions with great potential and prospects: it can double the cleaning efficiency on the basis of the same price. Up two to three times.
What is compound laser cleaning?
As we all know, in the high-end cleaning market, laser cleaning is less efficient than traditional cleaning methods at the same cost. For example, in the paint removal work of a ship overhaul, the area of the ship’s side paint is very large. Some use chemical cleaning, and some use high-pressure water cleaning. Many shipyards also propose to use laser cleaning, but laser cleaning is limited by power, and the thickness of the ship’s side paint per unit time is limited. The cleaning area of the paint layer cannot meet the requirements of the shipyard in terms of efficiency.
Of course, technically speaking, simply improving efficiency can be achieved by simply superimposing power; but the cost of this method is also increased by dozens or even hundreds of times after the power is increased, which is not cost-effective. This means that high-efficiency ship laser cleaning can only stay in theory, but cannot enter industrial applications.
Composite laser cleaning technology is to use 4000W continuous + 500W pulse to achieve the efficiency that can only be achieved by 1000W pure pulse laser cleaning machine, and use 6000W continuous + 1000W pulse to achieve the efficiency that can only be achieved by 2000W pulse cleaning machine.
On the basis of the same price, the cleaning efficiency can be increased by 2-3 times through process improvement. It has the advantages of improving cleaning quality, increasing cleaning efficiency, stabilizing the cleaning process, and being suitable for cleaning high-reflective materials, avoiding the shortcomings and shortcomings of single cleaning.
Laser composite cleaning principle
The principle of laser composite cleaning mainly uses semiconductor continuous laser as heat conduction output, so that the attachment to be cleaned absorbs energy to generate gasification and plasma clouds, and forms thermal expansion pressure between the metal material and the attachment, reducing the bonding force between the two layers. When the pulsed laser outputs a high-energy pulsed laser beam, the vibration and shock waves generated will make the attachments with weak binding force directly detach from the metal surface, thereby realizing rapid laser cleaning. The application of this technology covers ships, auto repairs, rubber molds, high-end machine tools, rails, and environmental protection. It can remove resin, paint, oil, stains, dirt, rust, coating, plating and oxide layer on the surface of objects.
The advantage of laser composite cleaning technology is not only the superposition of two kinds of lasers, but the key point is that the utilization rate of energy is far greater than the simple addition of two heat sources.
In the laser cleaning of thick coating materials, due to the large output of single laser multi-pulse energy and the high cost of high-power pulse lasers, laser cleaning of thick coating materials is limited; and the use of pulse laser-semiconductor laser composite cleaning can be fast and effective Improve the cleaning quality, and the substrate is not easy to cause damage.
In the laser cleaning of highly reflective materials such as aluminum alloys, a single laser has problems such as high reflectivity, and the use of pulsed laser-semiconductor laser composite cleaning increases the energy absorption rate of the oxide layer on the metal surface due to the thermal conduction and transmission of the semiconductor laser. , so that the pulsed laser beam can peel off the oxide layer faster, thereby improving the removal efficiency more effectively.