Ultrasonic cleaning is based on cavitation, that is, the rapid formation of numerous bubbles in the cleaning fluid and rapid implosion. The resulting impact will be submerged in the cleaning fluid inside and outside the surface of the workpiece dirt stripped down. With the increase of ultrasonic frequency, the number of bubbles increases and the blasting impact decreases, therefore, high frequency ultrasonic is especially suitable for cleaning small particles of dirt without breaking the surface of its workpiece.
Cavitation effect: Cavitation effect is the ultrasonic wave to the liquid with more than 20,000 times per second of compressive force and decompression interactive high frequency transformation. In the decompression effect, the phenomenon of vacuum nucleus group bubble is produced in the liquid, and in the compression force effect, the vacuum nucleus group bubble is crushed by the pressure to produce a strong impact, thus stripping the dirt on the surface of the cleaned object, so as to achieve precision washing.
Straight into the flow: ultrasonic waves in the liquid along the direction of sound propagation to produce the flow of the phenomenon known as straight into the flow. Sound intensity at 0.5W/cm2, the naked eye can see the straight into the flow, perpendicular to the vibration surface to produce flow, flow rate of about 10cm / s. Through this straight into the flow so that the surface of the cleaned object micro-oil dirt is agitated, the surface of the dirt cleaning liquid also produces convection, dissolved dirt dissolved liquid mixed with the new liquid, so that the dissolution speed is accelerated, plays a great role in the handling of dirt.
Acceleration: the acceleration generated by the liquid particle push. For the higher frequency of ultrasonic cleaning machine, cavitation is not significant, this time the cleaning mainly relies on the liquid particles ultrasound effect of acceleration impact particles on the dirt for ultra-precise cleaning.
Ultrasonic cleaning method more than the general to the conventional cleaning methods, especially the surface of the workpiece is more complex, like some surface unevenness, there are blind holes in the mechanical parts, some particularly small and have high requirements for cleanliness of products such as: watches and precision machinery parts, electronic components, circuit board components, etc., the use of ultrasonic cleaning can achieve very satisfactory results. Ultrasonic cleaning principle is issued by the ultrasonic generator high-frequency oscillation signal, through the transducer into a high-frequency mechanical oscillation and spread to the medium – cleaning solvent, ultrasound in the cleaning fluid in the same sparse forward radiation, so that the liquid flow and produce tens of thousands of tiny bubbles. These bubbles in the ultrasonic longitudinal propagation of the negative pressure zone formation, growth, and in the positive pressure zone quickly closed. In this process called “cavitation” effect, bubble closure can form more than 1000 atmospheres of instantaneous high pressure, continuous generation of instantaneous high pressure is like a series of small “explosion” constantly impact the surface of the object, so that the surface of the object and the crevices in the Dirt quickly peeled off, so as to achieve the purpose of object surface purification.
Compared with a variety of other cleaning methods, ultrasonic cleaning has: good cleaning effect, high cleanliness and all the workpiece cleanliness consistent; cleaning speed, improve production efficiency, no manual contact cleaning fluid, safe and reliable; deep holes, slits and hidden parts of the workpiece can also be cleaned; no damage to the surface of the workpiece, saving solvent, heat, workplace and labor and other advantages.
Because of the ultrasonic cleaning speed, good quality, and can greatly reduce environmental pollution, therefore, ultrasonic cleaning technology is increasingly being used in the industrial sector. In the specialized, group production enterprises, has gradually used ultrasonic cleaning machine to replace the traditional dipping, brushing, pressure washing, vibration cleaning and steam cleaning process methods, ultrasonic cleaning machine of high efficiency and high cleanliness, thanks to its sound waves in the medium when the propagation of the penetrating and cavitation impact guilt, so it is easy to with a complex shape, internal cavity and fine hollow parts clean, the general Degreasing, rust prevention, phosphating and other processes, in the role of ultrasound can be completed in just two or three minutes, its speed than the traditional method can be increased by several times, or even dozens of times, cleanliness can also reach high standards, which in many of the product surface quality and productivity requirements of high occasions, more highlighted with other treatment methods difficult to achieve or irreplaceable results.
