The principle of the laser cleaning machine is to use the laser to irradiate the surface of the processing material to produce a change in the coefficient of thermal expansion to separate the dirt from the surface of the processing material. Vibration, the separated dirt will be shattered by the laser during the vibration, so when we use the laser cleaning machine, it is more important to adjust the appropriate parameters, so that the processing material will not be damaged by the laser during the cleaning process, a Reasonable cleaning parameters can achieve non-destructive cleaning.
The principle of ultrasonic cleaning is that the cavitation, acceleration and direct flow of ultrasonic waves in the liquid directly and indirectly affect the liquid and dirt, so that the dirt is dispersed. Emulsify and separate to achieve the purpose of cleaning. At present, ultrasonic cleaning, cavitation and direct inflow used in traditional cleaning methods are used more.
So both of them are used as cleaning equipment, what are the characteristics and differences?
Ultrasonic cleaning uses ultrasonic waves as a generator, and the alternating-frequency signal sent out is converted into alternating-frequency mechanical vibration through the transducer, and then propagates to the medium (that is, the rupture phenomenon occurs in the form of "bubbles" in the cleaning solution), when "cavitation" occurs. "At the moment when the surface of the object to be washed breaks, an impact force far exceeding 1,000 atmospheric pressure is generated, causing the dirt in the voids on the surface of the object to be dispersed, cracked and peeled off.
The laser cleaning technology concentrates the energy in a small space range and time range and acts on the joint between the dirt and the substrate, so that it vaporizes or volatilizes or is instantly thermally expanded to overcome the adsorption force of the surface on the particles, so that it can be separated from the surface of the object. .
From the perspective of their respective principles and characteristics, the difference between the two is that laser cleaning is more convenient. Generally, hand-held cleaning can be done without any medium. , the working temperature can be -5°-50°.
The ultrasonic needs to add a cleaning agent. The higher the ultrasonic power density, the stronger the cavitation effect, the faster the speed, and the better the cleaning effect. However, for workpieces that require high precision surface finish, the use of long-term high power density cleaning will affect the cleaning effect. Cavitation corrosion occurs on the surface of the workpiece. Ultrasound is suitable for cleaning small volumes, but cannot remove sub-micron particle contamination, and cannot remove coating layers, etc. These laser cleaning is not a problem.
The above is the difference between laser cleaning machine and ultrasonic cleaning machine. Compared with ultrasonic cleaning, laser cleaning has obvious advantages. It is efficient, fast, low cost, small thermal load and mechanical load on the processing material, cleaning is non-damaging; does not damage the health of operators; the cleaning process is easy to achieve automatic control, and remote remote cleaning is realized.
