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ultrasonic cleaner frequency

ultrasonic cleaner frequency
With industrial development, more and more sophisticated ultrasonic cleaning machine cleaning workpiece, workpiece cleanliness requirements are also increasing, from cleaning effect and economic considerations, how to properly select the frequency and power of ultrasonic cleaning seem critical, in general, are needed to obtain data from the experiment.

There are two concepts: power and frequency. Amounted to less than a cleaning effect, when after a certain frequency of ultrasonic cleaning ultrasonic precision cleaning, if the workpiece to remove impurities larger particles, they may be insufficient ultrasonic power, the general increase in the ultrasonic power can solve the problem; but on the contrary if the workpiece to remove very small particles of impurities, then whatever power how increases, are unable to meet the requirements of the clean. The reason is that: when the liquid flows through the surface of the workpiece, will form a layer of adhesive film. Usually the layer of adhesive film when the low frequency is very thick the small particles buried in the inside, regardless of the ultrasonic power (intensity) is big, the cavitation bubbles are not in contact with the small particles and therefore can not completely remove the small particles; while elevated ultrasonic frequency when the thickness of the adhesive film will be reduced, and the ultrasonic generating cavitation bubbles can come into contact with the small particles, they are peeled off from the workpiece surface. Therefore, the low-frequency ultrasonic clear large particulate impurities effect is very good, but remove small particles of impurity effects on the poor. In contrast, the high-frequency ultrasound is particularly effective to remove small particles of impurities.

The choice of the ultrasonic frequency

Generally speaking, cleaning cleaning of hardware, machinery, automobile and motorcycle, compressor and other industries to use more 28KHZ frequency of the cleaning machine. Optics and Optoelectronics cleaning circuit board cleaning 40KHZ frequency, high-frequency, ultrasonic cleaning machine applies to computers, microelectronic components use more fine cleaning MHz ultrasonic cleaning applies to the cleaning of the integrated circuit chip, silicon and wave film, can remove micron, sub-micron level of the dirt on the cleaning member does not have any damage. For precision cleaning applications (such as liquid crystal, semiconductor, etc.), the use of traditional frequency not only can not achieve the requirements of cleaning, but may also cause damage to the workpiece. The most typical example is the military electronic products, the industry has been expressly does not permit the use of traditional frequency (20 ~ 30KHz) Ultrasonic Cleaner. In fact, in Europe and the United States, Japan and other developed countries, the washing machine through the selection of high-frequency (80KHz or more frequency, and some have reached 200K or 400K) this problem has been resolved.

So why the high-frequency cleaning to avoid damage to the workpiece? We all know the basic principles of ultrasonic cleaning liquid cavitation effect. In fact, the degree of strength of the cavitation effect of directly with the frequency, the higher the frequency, the smaller the cavitation bubbles, the cavitation intensity is weaker, and its weakened very large. Example, 25KHz cavitation strength than for 1,40 KHz cavitation intensity compared to 1/8, when 80KHz cavitation intensity dropped to 0.02. So if the frequency selection is correct, the ultrasonic damage the workpiece does not exist.

Thus, ultrasonic cavitation threshold and the frequency of the ultrasonic waves are closely related, the higher the frequency, the higher the cavitation valve. In other words, the frequency is low, cavitation is more easily generated and, in the low-frequency case, the liquid by compression and sparse role longer intervals, so that bubbles can grow to a larger size, higher the cavitation intensity before the crash, there conducive to cleaning action. Therefore, the low-frequency ultrasonic cleaning applies in large part surface or dirt and cleaning the surface combined with high occasions. Corrosive cleaning the surface, not suitable for cleaning the surface finish of parts, and the cavitation noise. A frequency of about 40 kHz, in the same sound intensity, the number of cavitation bubbles generated than the frequency of 20KHZ more strong penetration advised to clean the surface of complex shape or a blind hole of the workpiece, cavitation noise is small, but the lower cavitation intensity for cleaning dirt and cleaning the surface binding force weak occasions.

Ultrasonic power of choice

When the sound intensity increases, the ratio of the maximum radius of the initial radius of the cavitation bubbles increases, cavitation intensity increases, that sound intensity the higher, more intense cavitation favor ultrasonic cleaning action. But not ultrasonic sound power the bigger the better, the sound intensity is too high, it will generate a lot of useless bubbles, increasing scattering attenuation, the formation of the sound barrier, and at the same time also increases the nonlinear attenuation of sound intensity increases, so will weaken away from the sound source The place of the cleaning effect. Therefore, the effect of ultrasonic cleaning is not necessarily in proportional to the applied power and working time, and sometimes with a small power, it takes a long time without the removal of dirt, while if the power reaches a certain value, it is possible quickly to remove dirt.

Ultrasonic power is too large, then the liquid hollow of strength greatly increased corrosion spots will produce more sophisticated parts water pitting corrosion also increases, vibrating plate surface by cavitation corrosion, strong power underwater cavitation corrosion more serious reduced equipment life, resulting in unnecessary losses while cleaning the cylinder vibration plate at the bottom of cavitation is also very serious, so the shortened life of the cylinder.

Ultrasonic cleaning power select small, it takes a long time did not remove the dirt, is not desirable. The conventional ultrasonic cleaning in industry which standard ultrasonic cleaning machine, ranging from 100W to 1500W, the workpiece, the power of the ultrasonic wave is determined by the size of the body of the ultrasonic cleaning tank, in considering the premise of the cleaning tact. Reverberant field sound intensity measurement technology is still not mature enough given the current, or power per unit area on the design, generally most of the output power density of a standard ultrasonic cleaning machine election in about 0.3 to 0.6 watts / square centimeter, of course This is just the conventional case. Pulse to focus ultrasonic cleaning optional higher.

So the best way is generally a guide to get the appropriate configuration parameters to configure the actual use of ultrasonic power, it is a good practical application. Another optional ultrasonic cleaning machine can try to choose adjustable power washing machine.

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