Ultrasonic cleaning machine frequency and power

Ultrasonic cleaning machine frequency and power：With the development of industry, ultrasonic cleaning machines have clean and delicate, the workpiece on the cleanness of workpiece, so more and more is also high requirements from cleaning effect and economic
Sex, how to choose the ultrasonic cleaning frequency and power, the general situation is vital to retrieve data from experiments are needed.

Here are two concepts: power and frequency. In ultrasonic cleaning, when certain precision of ultrasonic cleaning after frequency reach clean effect, if the workpiece on going
Besides, the impurities particle ultrasonic power shortage can be increased, ultrasonic power can solve this problem, But contrary to remove the workpiece if impurities
Grain is very small, so whatever power, can achieve what cleaning requirements. The reason is that: when the liquid flows when the workpiece surface, can form a cohesive membrane. low
Generally this layer when very thick sticky film, small particles is buried inside, regardless of the intensity of ultrasonic power (how), cavitation bubbles are unable to contact with small particles and are unable to take
Completely remove the small particles, And when the ultrasonic frequency is increased, viscous membrane thickness will be reduced, ultrasonic cavitation bubble of small particles can be exposed to work them out,
The surface spalling. Therefore, the low-frequency ultrasonic remove impurities in large particles of the effect is very good, but remove impurities effect is very small particles. Relatively speaking, high-frequency ultrasound to remove
Small particles is particularly effective impurities.

Ultrasonic frequency selection

Generally speaking, cleaning, hardware, machinery, automobile, compressor, etc 28KHZ use of cleaning the washing frequency. Optical photoelectron cleaning, cleaning
The frequency 40KHZ and using high-frequency ultrasound, and is suitable for computer, microelectronics devices, the fine cleaning suitable ultrasonic cleaning MHZ, silicon integrated circuits
And the thin, can remove micron, clean the dirt and sub micron grade for cleaning parts without any damage. But for some precision cleaning (such as LCD, semiconductor, etc.)
The use of traditional applications, not only cannot reach the frequency, but also clean may cause damage to the workpiece. The most typical example of military electronic products, industry
Has expressly are not allowed to use the traditional frequency (20 ~ 30KHz) of ultrasonic cleaning machines. In some developed countries such as Europe, America, Japan, have chosen by high-frequency cleaning
80KHz machine (or above frequency, some have reached the 400K) 200K or problem solved.

So why can avoid high frequency of workpieces cleaning damage? Everybody knows the basic principle of ultrasonic cleaning fluid is based on the cavitation. Over the fact the effect
The strength should be concerned with frequency directly, the higher the frequency, the smaller the cavitational bubbles, cavitation intensity, and its weakens the weak level is very big. For example, if the cavitation 25KHz
1,40 when compared to the strength of cavitation intensity KHz for 1/8 to 80KHz, cavitation intensity is to 0.02. So if you choose the right, the frequency of ultrasonic damage workpiece
There is no problem.

Thus, ultrasonic cavitation threshold and ultrasonic frequency has close relationship, the higher the frequency, the cavitation valve is higher. In other words, the low frequency, the more easily produce cavitation,
And at low frequencies by compression and liquid sparse effect more long intervals of bubbles in the crash, that the former can grow to the larger size, increase the strength, high
For cleaning effect. So the low-frequency ultrasonic cleaning is applied parts surface or dirt and clean surface of occasions. Scien-tech But it's easy to clean the surface corrosion and discomfort
Appropriate cleaning surface finish high components, and the cavitation noise. Around 40 KHZ, on the same frequency, intensity of cavitation bubble number for more than the frequency at 20KHZ,
Strong penetration, appropriate cleaning surface complex shape or blind holes of cavitation noise, small, but the cavitation intensity inferior, suitable for cleaning dirt and cleaning the surface adhesion
Weak occasions.

Ultrasonic power options

When sound intensity increases, the cavitation bubble of maximum radius and the initial radius increased, the ratio of cavitation intensity increases, namely sound intensity, cavitation, ultrasonic stronger
Washing. But not the ultrasonic sound power, high intensity, produces a large number of bubbles, add scattering useless, sound insulation, decay and sound intensity increased also
Increases the nonlinear damping, sound so far place will weaken the cleaning effect. Therefore, ultrasonic cleaning effect is mixed with added power and working time into positive
Sometimes, small power spend a long time without removing dirt, and if the power up to a certain value, it may soon will remove dirt.

If the ultrasonic power is too big, liquid ZhongKongHua strength greatly increased, precision parts will produce points, water corrosion as well, if the vibration plate surface has
To the cavitation erosion, strong power produced water cavitation erosion under more serious, the service life of equipment, reduce unnecessary losses, and clean cylinder bottom vibration plate is also cavitation
Seriously, make the cylinder life.

But the ultrasonic cleaning power choose small, take a long time to also have no clear dirt, is not advisable. Conventional ultrasonic cleaning in the industry, standard
Sound waves from 100W 1500W to cleaning, depending on how workpieces cleaning beats, under the premise of ultrasonic cleaning trough by the size of the ultrasonic power decisions. Given the reverberation field intensity measurement technology is not mature, or use on unit area of power to design, a standard ultrasonic washer output power density
In most 0.3 ~ 0.6 watts per square centimeter, of course, this is normal. Pulse focus ultrasonic cleaning optional taller.

So the best way is usually do experiments to acquire the appropriate