The effect of ultrasonic cleaning depends on the correct selection of ultrasonic cleaning process. Therefore, some process parameters (such as ultrasonic frequency, ultrasonic power density, ultrasonic cleaning time), the placement of cleaned parts, the requirements for cleaning solution and its formula are briefly analyzed.

A)超声波频率

A) Ultrasonic frequency

在超声波清洗中，要正确选用超声波的频率。超声波频率是起决定性作用的工艺参数，因为它对空化作用有直接的影响。超声波频率越低，超声空化作用越强，清洗效果也比较理想，但噪音较大。故一般采用的超声波频率为20千赫左右，此时的空化作用强，清洗效果也比较好。

In ultrasonic cleaning, the frequency of ultrasonic should be selected correctly first. Ultrasonic frequency is a decisive process parameter because it has a direct impact on cavitation. The lower the ultrasonic frequency is, the stronger the ultrasonic cavitation is, and the cleaning effect is ideal, but the noise is large. Therefore, the general ultrasonic frequency is about 20 kHz. At this time, the cavitation effect is strong and the cleaning effect is better.

对于表面光洁度较高的零件以及具有较小直径的孔类零件，宜采用波长较短、能量较集中的高频超声波清洗。但高频的超声振动在清洗液中衰减较大、作用距离较短、空化强度较弱，因而清洗效率也较低。

For parts with high surface finish and hole parts with small diameter, high-frequency ultrasonic cleaning with short wavelength and concentrated energy should be adopted. However, the high-frequency ultrasonic vibration has large attenuation, short action distance and weak cavitation intensity in the cleaning fluid, so the cleaning efficiency is also low.

此外，还由于高频超声波的方向性所产生的“阴影”，会造成被清洗件的某些部位清洗不到的现象。在使用无频率跟踪的超声波清洗机时，需经常调节超声波发生器的“频率调节”旋钮，以便使其输出信号的频率与换能器的固有频率始终保持一致，从而达到空化作用强、清洗效果的目的。

In addition, the "shadow" caused by the directionality of high-frequency ultrasound will cause the phenomenon that some parts of the cleaned parts cannot be cleaned. When using the ultrasonic cleaning machine without frequency tracking, it is necessary to often adjust the "frequency adjustment" knob of the ultrasonic generator so that the frequency of its output signal is always consistent with the natural frequency of the transducer, so as to achieve the purpose of strong cavitation and cleaning effect.

B)超声波功率密度

B) Ultrasonic power density

超声波清洗中，清洗效果是随着超声波功率密度增加而提高的。但过高的功率密度会由于空化作用过份强烈而引起被清洗件表面的浸蚀(即所谓空化腐蚀)，从而使被清洗件表面受到损伤。这种现象尤其对工件上的各种镀层以及铝合金件更为突出。为此，对于油污程度严重、形状复杂、有深孔和盲孔的被清洗件，以及在清洗槽较深、清洗液粘度较大时，可选用较大的功率密度。高频超声波清洗时，功率密度也可以选大一些，以抵消其衰减大、作用距离短的弱点。若在粘度较小的清洗液中进行漂洗时，则超声波功率密度可以选小一些。

In ultrasonic cleaning, the cleaning effect increases with the increase of ultrasonic power density. However, too high power density will cause the surface of the cleaned part to be corroded (so-called cavitation corrosion) due to too strong cavitation, which will damage the surface of the cleaned part. This phenomenon is particularly prominent for various coatings on workpieces and aluminum alloy parts. Therefore, for the cleaned parts with serious oil pollution, complex shape, deep holes and blind holes, and when the cleaning tank is deep and the viscosity of the cleaning solution is large, a larger power density can be selected. During high-frequency ultrasonic cleaning, the power density can also be larger to offset the weakness of large attenuation and short action distance. When rinsing in a cleaning solution with low viscosity, the ultrasonic power density can be selected to be smaller.

C)清洗时间

C) Cleaning time

超声波清洗的效果和质量与超声波清洗的时间有关。清洗时间太短会达不到清洗的质量要求；但清洗时间过长，不仅降低工效，而且由于超声波对被清洗件表面的空化腐蚀作用而影响了零件的表面质量。

The effect and quality of ultrasonic cleaning are related to the time of ultrasonic cleaning. If the cleaning time is too short, it will not meet the quality requirements of cleaning; However, the cleaning time is too long, which not only reduces the work efficiency, but also affects the surface quality of the parts due to the cavitation and corrosion effect of ultrasonic on the surface of the cleaned parts.

油污程度严重、形状复杂的零件清洗时间宜略长一些；具有各种镀层的零件、铝及铝合金件的清洗时间应短些；表面光洁度较高的零件，一般情况下油污会相对少一些，此时清洗时间也不宜过长

The cleaning time of parts with serious oil stain and complex shape should be slightly longer; The cleaning time of parts with various coatings, aluminum and aluminum alloy parts shall be shorter; Generally, the parts with high surface finish will have less oil stain, and the cleaning time should not be too long at this time

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Industrial ultrasonic cleaning machine focuses on providing customers with satisfactory service. For more wonderful contents, please click to enter our website http://www.sinokohl.com , we will have more wonderful content for you to check