The principle of ultrasonic cleaning is that the high-frequency oscillation electric 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 area density of emission power can reach 0.35w/cm?, At this time, the peak pressure area of ultrasonic sound 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.

這種由無數個細小空化氣泡破裂而產生的沖擊波，連續不斷地沖擊清洗物件零件表面，使工件表面和縫隙中的污垢迅速被沖刷下來，從而達到工件表面凈化目的。

This kind of shock wave generated by the rupture of countless small cavitation bubbles continuously impacts the surface of the cleaning object and 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.

超聲波清洗實質是清洗介質的化學作用和超聲“空化”效應的物理作用相結合，因而比浸泡清洗單化學作用大大提高了清洗效率與效果。

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.

超聲波清洗在應用到噴漆前處理時，需要注意：

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

1、要重視清洗液的合理選擇，大量生產中要高度重視清洗液的過濾，否則渾濁的清洗液會引起零件的新污染。清洗度要求嚴的工件，可多設幾道漂洗，后應用離子水漂洗。

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、要注意零件廢液對下道槽液的污染。

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

3、前處理工藝要注意滿足鋼件、鋁鑄件和組件如減振器總成對清洗、磷化和烘干的不同要求。

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

4、自動線上的零件掛具應盡可能減小對超聲波作用的影響，并應兼顧到靜電噴漆時的導電要求。

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

5、銅件噴漆前處理的磷酸鹽轉化膜應滿足GB6807-86標準要求。

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

6、超聲波前處理工藝應與后續噴漆工藝很好銜接，并應滿足噴漆工藝對前處理的要求等。

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

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