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How to choose the frequency of the ultrasonic cleaning machine

The ultrasonic cavitation threshold is closely related to the frequency. The higher the frequency, the higher the cavitation threshold. The frequency is low, and the lower the cavitation threshold, the easier it is to cavitation. At low frequencies, the time between compression and sparse action of the liquid is longer. The bubble can grow to a larger size, enhance the cavitation strength, and facilitate the cleaning effect. Therefore, low-frequency ultrasonic cleaning is generally used on the surface of large parts or when the adhesion of dirt to the surface of the workpiece is high. However, it is easy to damage the surface of the workpiece. Therefore, parts with higher requirements on the surface of the workpiece are not suitable for selecting lower frequencies. Moreover, the frequency is low and the noise generated is correspondingly large. High-frequency ultrasonic penetration is strong, and it is better to clean parts with high surface finish or complex surfaces and many blind holes. 

On the other hand, the high-frequency ultrasonic noise is also small, suitable for cleaning some precision parts, such as some electronic parts, small bearing processing, magnetic materials and so on. For some special workpieces such as integrated circuit chips and silicon wafer coating, it is better to select higher frequency ultrasonic waves for cleaning. For large workpieces such as automobile engines and valves, low-frequency ultrasonic waves should be selected for cleaning. On the other hand, considering the ultrasonic cleaning effect and economy, the frequency is generally selected from 20 to 130 kHz. The specific selection frequency should be determined by corresponding experiments.