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The market for laser cleaning applications is so big that you can‘t imagine
Time:2021-08-03
Views:1013
The market for laser cleaning applications is so big that you can‘t imagine
Principle and classification of laser cleaning
Traditional cleaning industrial equipment has a variety of cleaning methods, mostly using chemical and mechanical methods. With the increasingly strict requirements of environmental protection laws and regulations and the increasing awareness of environmental protection and safety, the types of chemicals that can be used in industrial production cleaning will become less and less.
How to find a cleaner and non-destructive cleaning method is a problem we have to consider. Laser cleaning has the characteristics of no grinding, non-contact, low heat effect and suitable for objects of various materials. It is considered to be the most reliable and effective solution.
Howweld team focus on laser machines,expecially for laser cleaing for metal rust,painting,coating,oil stain.
Among the pollutants on the workpiece surface, the combination between the attachment on the workpiece surface and the surface is mainly due to the following forces: covalent bond, double dipole, capillary action, hydrogen bond, adsorption force and electrostatic force.
Among them, capillary force, adsorption force and electrostatic force are the most difficult to destroy. Laser cleaning technology is to overcome these forces.
.jpg "fiber laser cleaning machine")
Three main binding forces between particles and object surface
These adsorption forces are much larger than gravity (several orders of magnitude) and are related to particle diameter D. the adsorption force shows a slow linear attenuation trend with the decrease of particle radius, and the particle mass m is directly proportional to the third power of diameter. According to Newton‘s law, f = ma.
When the particle size becomes smaller, the acceleration provided by the adsorption force increases rapidly. Therefore, the smaller the size of particles, the greater the acceleration required to remove them. This is why conventional cleaning technology is difficult to remove the surface attachments of objects with small diameter.
Due to the complex composition and structure of attachments on the surface of objects, the mechanism of laser action is also different.
The most commonly used theoretical models for explaining this are as follows:
one
Phosgenation / photodecomposition
The laser generated by the laser can achieve a high concentration of energy through the focusing of the optical system. The focused laser beam can produce a high temperature of thousands or even tens of thousands of degrees near the focus, making the attachments on the surface of the object vaporize or decompose instantly.
two
Light stripping
The attachment on the object surface is heated and expanded by the action of laser. When the expansion force of the attachment on the object surface is greater than the adsorption force between it and the substrate, the attachment on the object surface will be separated from the surface of the object.
three
Light vibration
The pulsed laser with high frequency and power is used to impact the surface of the object to generate ultrasonic wave on the surface of the object. The ultrasonic wave returns after impacting the hard surface of the middle and lower layers and interferes with the incident sound wave, resulting in high-energy resonance wave, which makes the dirt micro burst, crush and separate from the surface of the substrate. When the absorption coefficient of the laser beam between the object and the surface attachment is not different, Or when toxic substances will be generated after the surface attachments are heated, this cleaning method can be selected.
.jpg "rust removal laser cleaning machine")
At present, there is no unified standard for the structure of laser cleaning equipment, which needs to be determined according to the actual cleaning method, the types of substrates and dirt, the effect of cleaning requirements and other factors. However, they are roughly the same in some basic structures, mainly including laser, mobile platform, real-time monitoring system Semi / automatic control operating system and other auxiliary systems.
Development status of laser cleaning technology abroad
The research of laser cleaning technology started in the mid-1980s, but it did not really enter industrial production until the early 1990s, and gradually replaced the traditional cleaning methods in many occasions.
The decontamination range of laser cleaning abroad is very wide, from thick rust layer to fine particles on the laser surface can be removed. There are many types of equipment used in laser cleaning experiments, and the wavelength range of lasers used is wide. However, the development of laser cleaning technology is uneven, some have realized industrialization, and some are still in the laboratory stage.
For example, in terms of laser mold cleaning abroad, 1000 W laser manual cleaning machine has been developed;
Electronic circuit cleaning adopts 248 nm laser, 3 W, 20 ns, which has been industrialized;
In the chip field, 248 nm, 5 W nanosecond UV cleaning is adopted, and the effect is very good;
In the photomask, ultraviolet laser has completely replaced the traditional chemical method;
In terms of laser rust removal and laser pollutant removal, it has been applied on a large scale, and the experiment precedes the theory. In addition, experimental verification has been started in the field of semiconductor, magnetic head and insulator.
In recent years, German cleanlaser company has been committed to the research of laser cleaning equipment that can realize on-line and high-temperature cleaning of plastic injection mold and rubber vulcanization mold. According to the power level of the laser used, cleanlaser company and p-laser company are the most famous. The performance and characteristics of several typical laser cleaning systems are introduced below.
Prospect prediction of laser cleaning technology: the emergence of laser cleaning technology has opened up a new field of industrial application of laser technology. Its development in microelectronics, architecture, nuclear power plant, automobile manufacturing, medical treatment, cultural relics protection and other fields is in the ascendant, and the application market prospect is broad. China‘s application in the field of laser processing technology of large parts has begun to take shape,
.jpg "laser cleaning for painting coating machine")
The application of laser cleaning technology in steel derusting and mold decontamination is still blank, and the market of laser cleaning technology in automobile manufacturing, construction and other fields is still under development.
At present, although it is difficult to estimate the application market share of laser cleaning technology in detail, many of the above fields belong to the pillar industries of the national economy.
After the addition of laser cleaning technology, The economic and social benefits are very considerable. It is entirely possible to develop supporting laser cleaning equipment by using China‘s existing laser technology conditions and make it practical and industrialized in a short time.
It is also of great significance to promote the development of high-tech industry.
The above content comes from Howweld.A famous laser equipment manufacturer in China,persistently promote the application of laser equipment in various industries,to provide customers with the most suitable solution.Welcome to inquire, visit and testing samples.Email:info@howweld.com
The above content comes from Howweld.A famous laser equipment manufacturer in China,persistently promote the application of laser equipment in various industries,to provide customers with the most suitable solution.Welcome to inquire, visit and testing samples.Email:info@howweld.com
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