The principle of ultrasonic cleaning is that the high-frequency oscillation electrical signal sent by the ultrasonic generator is transformed into mechanical oscillation through the transducer and transmitted to the medium cleaning solution. The ultrasonic is radiated forward in the cleaning solution. When the ultrasonic pressure reaches an atmospheric pressure, the emission power area density can reach 0.35w/cm?, At this time, the peak pressure area of ultrasonic wave can be close to vacuum or negative pressure. At this time, countless small cavitation bubbles form and grow. When the ultrasonic pressure reverses and reaches the maximum value, the bubble breaks, which can produce an instantaneous strong (crack) impact of about tens of millions of MPA atmospheric pressure and local high temperature.

这种由无数个细小空化气泡破裂而产生的冲击波，连续不断地冲击清洗物件零件表面，使工件表面和缝隙中的污垢迅速被冲刷下来，从而达到工件表面净化目的。

This shock wave generated by the rupture of countless small cavitation bubbles continuously impacts the surface of the cleaned parts, so that the dirt on the workpiece surface and gap can be washed down quickly, so as to achieve the purpose of workpiece surface purification.

超声波清洗实质是清洗介质的化学作用和超声“空化”效应的物理作用相结合，因而比浸泡清洗单化学作用大大提高了清洗效率与效果。

The essence of ultrasonic cleaning is the combination of the chemical action of cleaning medium and the physical action of ultrasonic "cavitation" effect, which greatly improves the cleaning efficiency and effect compared with immersion cleaning.

超声波清洗在应用到喷漆前处理时，需要注意：

When ultrasonic cleaning is applied to the pre-treatment of painting, attention shall be paid to:

1、要重视清洗液的合理选择，大量生产中要高度重视清洗液的过滤，否则浑浊的清洗液会引起零件的新污染。清洗度要求严的工件，可多设几道漂洗，后应用离子水漂洗。

1. Pay attention to the reasonable selection of cleaning fluid, and attach great importance to the filtration of cleaning fluid in mass production, otherwise the turbid cleaning fluid will cause new pollution of parts. For the workpiece with strict cleaning requirements, several more rinsing can be set, and finally rinse with ionic water.

2、要注意零件废液对下道槽液的污染。

2. Pay attention to the pollution of part waste liquid to the lower tank liquid.

3、前处理工艺要注意满足钢件、铝铸件和组件如减振器总成对清洗、磷化和烘干的不同要求。

3. The pretreatment process shall pay attention to meet the different requirements for paired cleaning, phosphating and drying of steel parts, aluminum castings and components such as shock absorber assembly.

4、自动线上的零件挂具应尽可能减小对超声波作用的影响，并应兼顾到静电喷漆时的导电要求。

4. The part hanger on the automatic line shall minimize the impact on the ultrasonic action, and shall take into account the conductive requirements during electrostatic painting.

5、铜件喷漆前处理的磷酸盐转化膜应满足GB6807-86标准要求。

5. The phosphate conversion film of copper parts before painting shall meet the requirements of gb6807-86.

6、超声波前处理工艺应与后续喷漆工艺很好衔接，并应满足喷漆工艺对前处理的要求等。

6. The ultrasonic pretreatment process shall be well connected with the subsequent painting process, and shall meet the pretreatment requirements of the painting process.

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