Laser Cleaning Technology and Application

As global environmental protection regulations become more and more stringent, people’s awareness of environmental protection and safety is increasing, and the types of chemicals that can be used in industrial cleaning will become less and less. How to find a cleaner and less damaging cleaning method is an imminent problem.

#Lasercleaning technology is a new type of cleaning technology that has developed rapidly in recent years. It has gradually replaced traditional cleaning processes in many fields with its own advantages and irreplaceability. So why can the laser be used to clean and not cause damage to the object being cleaned? How is its cleaning effect?

1. Laser cleaning technology Laser cleaning technology

The mechanism of laser cleaning is mainly based on the fact that after the pollutants on the surface of the object absorb laser energy, either vaporize and volatilize, or are instantly thermally expanded to overcome the adsorption force of the surface on the particles, so that they can be separated from the surface of the object, thereby achieving the purpose of cleaning. At present, the mechanism of laser cleaning generally includes four aspects: laser vaporization and decomposition, thermal expansion of dirt particles, substrate surface vibration and particle-to-particle vibration, and laser peeling; and laser cleaning is often the result of the simultaneous action of multiple mechanisms.

Its physical principle is as follows:

(a)? The light beam emitted by the laser is absorbed by the contamination layer on the surface to be treated and vaporized.

(b) The absorption of large energy forms a rapidly expanding plasma and generates a shock wave.

(c) The shock wave breaks the contaminants into fragments and strips them away.

There are two thresholds for plasma generation. The first threshold depends on the contamination or oxide layer being removed, and only when the energy density is above this threshold will plasma be generated. Likewise, there is a second threshold for its occurrence, and if the energy density exceeds this threshold, the substrate material will be destroyed. In order to ensure the safety of the base material and carry out effective cleaning, the laser parameters must be adjusted according to the situation, so that the energy density of the optical pulse is strictly between the two thresholds, which ensures the self-control of laser cleaning. Light pulses with an energy density above the first threshold will reject contaminants until they reach the substrate material. However, since its energy density is below the destruction threshold of the substrate material, the substrate is not destroyed.

Different cleaning methods comparison：

Laser cleaning technology is a complete “dry” cleaning process and a “green” cleaning process. The cleaned waste is basically solid powder, small in size, easy to store, recyclable, and much cleaner than Traditional cleaning process; suitable for almost all solid substrates, from large lumps of dirt (fingerprints, rust, oil, paint) to small fine particles (such as metal microparticles, dust) can be cleaned with this method.02

2. Application areas of laser cleaning Application areas of laser cleaning

Traditional cleaning methods mostly use chemical agents, sandblasting, or high-pressure water for cleaning. In contrast, laser cleaning machines are a new generation of intelligent products. Effectively removes contaminants and rejuvenates surfaces like new ones. It has the characteristics of no grinding, non-contact, and no thermal effect, and is suitable for objects of various materials. For metal production, electronic industry, engineering construction shipbuilding and other related fields, timely laser cleaning is a very important task. important work.

Every year, tire manufacturers produce hundreds of millions of tires. The quality of the mold directly affects the quality of the tire. During the production process, the tire mold must be cleaned quickly and reliably to save downtime. Using the laser cleaning method, the optical fiber connection can be used to transmit the light to the dead corners of the mold or the parts that are not easy to remove for cleaning. The surface cleanliness is high, the cleaning speed is faster, the cleaning effect is good, and there is no damage to the mold. , High-quality and efficient cleaning.

In addition, in the cleaning of weapons and equipment, decontamination cleaning in the electronics industry, precise de-esterification cleaning in the precision machinery industry, etc., in the fields of marine ships, aerospace and other fields, laser cleaning technology has shown multiple advantages, with huge application potential.

Facing the broad application scenarios of laser cleaning, GW Laser has launched an air-cooled hand-held laser cleaning machine, which can clean the workpieces that are not easy to move by hand, selectively clean the workpieces, and flexibly clean some dead corners in place.

Product main features:

1. The equipment adopts air-cooled integrated design, no additional chiller is needed, the whole machine is light and portable, the weight is less than 60kg, the volume is about the size of a business suitcase, and the 220V voltage power supply can be used with you.

2. Using 976nm pumping technology, the power is up to 1500W, which saves energy and saves electricity and high energy density. It has a good cleaning effect on thicker rust and oxide layers.

3. There are multiple built-in modes, which can realize pulse laser cleaning and continuous laser cleaning. Different cleaning methods are suitable for different usage scenarios: continuous mode cleaning is for thick plates that are not easily deformed by heat, such as rust removal on the surface of thicker metal plates, and surface cleaning of ship plates. Use pulse mode to clean paint, oil, rust, etc. on the surface of thin metal sheets or abrasives, which can prevent substrate damage caused by heat accumulation.

Specification

In the future, with the continuous development of advanced manufacturing, higher requirements will inevitably be placed on the process of laser cleaning technology. GW Laser will continue to make efforts in the field of laser cleaning. Through independent innovation, it will update and iterate products, and continue to upgrade to help customers improve laser cleaning technology, enhance market competitiveness, and make laser a universal tool for universal benefits.

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