Ultrasonic cleaning technology features
The cleaning effect is good, the cleanliness is high and the cleanliness of all the workpieces is consistent.
The cleaning speed is fast, the production efficiency is improved, and the cleaning liquid is not required to be touched by human hands, which is safe and reliable.
Deep holes, slits and hidden parts of the workpiece can also be cleaned.
No damage to the surface of the workpiece, saving solvent, heat, work site and labor.
Ultrasonic cleaning methods are more common than conventional cleaning methods, especially the surface of the workpiece is complex, such as some surface irregularities, mechanical parts with blind holes, some products that are particularly small and have high requirements for cleanliness such as watches and clocks. Precision mechanical parts, electronic components, circuit board components, etc., can achieve very good results by ultrasonic cleaning. The principle of ultrasonic cleaning is the high-frequency oscillating signal emitted by the ultrasonic generator, which is converted into high-frequency mechanical oscillation by the transducer and propagated to the medium-cleaning solvent. The ultrasonic waves are densely dispersed in the cleaning liquid to make the liquid forward. It flows and produces tens of thousands of tiny bubbles.
These bubbles form and grow in the negative pressure region in which the ultrasonic waves propagate longitudinally, and rapidly close in the positive pressure region. In this process known as the "cavitation" effect, the bubble closure can form an instantaneous high pressure of more than 1000 atmospheres, and the continuous generation of instantaneous high pressure is like a series of small "explosions" constantly impacting the surface of the object, so that the surface of the object and The dirt in the gap is quickly peeled off, thereby achieving the purpose of purifying the surface of the object.
The mechanism of ultrasonic cleaning mainly has the following aspects: a strong shock wave is generated when the cavitation bubble is broken, and a part of the dirt layer is peeled off, dispersed, emulsified, and peeled off under the action of the shock wave. Because of the bubbles generated by the cavitation phenomenon, the gap between the dirt layer formed by the impact and the surface layer and the gap penetrates, because the small bubble and the sound pressure expand and contract simultaneously, the physical force such as peeling repeatedly acts on the dirt layer, the dirt The layers are peeled off and the bubbles continue to penetrate inward until the dirt layer is completely stripped. This is the secondary effect of cavitation. The impact of ultrasonic vibration of cleaning fluid on dirt in ultrasonic cleaning. Ultrasonic accelerated chemical cleaning agent (RT-808 ultrasonic cleaning agent) combines chemical and physical forces to accelerate the cleaning process.
Main parameters of ultrasonic cleaning
Frequency: 20~90KHz
Cleaning medium: Ultrasonic cleaning, generally two types of cleaning agents: chemical solvents, water-based cleaning agents (RT-808 ultrasonic cleaning agents). The chemical action of the cleaning medium can accelerate the ultrasonic cleaning effect, the ultrasonic cleaning is a physical action, and the two functions are combined to fully and thoroughly clean the object.
Power density: power density = transmission power (W) / emission area (cm2) is usually ≥ 0.3W / cm2, the higher the power density of the ultrasonic wave, the stronger the cavitation effect, the faster the speed, the better the cleaning effect. However, for precision, high-surface finish objects, long-term high-power density cleaning can cause "cavitation" corrosion on the surface of the object.
Ultrasonic frequency: The lower the ultrasonic frequency, the easier the cavitation in the liquid is, the stronger the force is, and the stronger the effect is, which is suitable for the initial washing of the workpiece (rough, dirty). The high frequency makes the ultrasonic direction strong, which is suitable for fine object cleaning.
Cleaning temperature: Generally speaking, the ultrasonic wave has the best cavitation effect at 30 °C - 40 °C. The higher the temperature of the cleaning agent, the more significant the effect. Generally, when the ultrasonic wave is actually applied, an operating temperature of 50 ° C to 70 ° C is employed.
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