Knowledge | 2022-09-24
A brief analysis of the ultrasonic cleaning process
The effect of ultrasonic cleaning depends on the correct selection of the ultrasonic cleaning process. The following clean Thai small series is for everyone to share a brief analysis of the ultrasonic cleaning process, for reference only.
In ultrasonic cleaning, the first thing is to select the correct ultrasonic frequency. The ultrasonic frequency is a decisive process parameter, which plays a vital role in cleaning. The lower the ultrasonic frequency, the stronger the cavitation effect and the stronger the cleaning effect. However, cavitation can lead to surface roughness, high frequency, energy concentration, high density, and low cavitation intensity, but it is very effective for parts with high cleanliness or small aperture
Ultrasonic power density
In the process of ultrasonic cleaning, the cleaning effect increases with the increase of ultrasonic power density. But the high power density and cavitation effect is strong, resulting in cleaning parts surface erosion, and damage cleaning parts' surface. This phenomenon on the workpiece of various coating and aluminum alloy parts is particularly prominent. Therefore, for serious oil, complex shape, deep hole and blind hole cleaning parts, as well as cleaning tank deep, cleaning fluid viscosity, can choose a larger power density. In the process of high-frequency ultrasonic cleaning, it is also possible to choose a larger power density to counteract the weakness of large attenuation and short effect distance. If rinsing in less viscous cleaning fluid, a smaller ultrasonic power density can be selected.
Ultrasonic cleaning time
The effect and quality of ultrasonic cleaning are related to the time of ultrasonic cleaning. If the cleaning time is too short, it can not meet the cleaning quality requirements, but if the cleaning time is too long, the cavitation corrosion of the cleaning parts' surface will affect the surface quality of the parts.
As a result, the cleaning time for parts with serious oil contamination and complex shape can be longer, shorter for parts with various coatings, aluminum and aluminum alloy parts, and shorter for parts with a higher Surface finish. Therefore, the specific cleaning time of different devices is according to the actual situation to grasp.
Fourth, the cleaning parts of the placement and cleaning methods
1. Generally speaking, the parts after cleaning are placed in the cleaning tank for cleaning, suitable for small and medium-sized parts. If the oil is serious parts, you can first heat immersion or washing, and then use ultrasonic cleaning. This can improve cleaning efficiency and reduce cleaning costs.
2. The clearances and grooves with complex geometry are cleaned by an ultrasonic wave at various frequencies, i. e. at several different ultrasonic frequencies.
3. For special strict requirements of the workpiece, you can use several different formulations of cleaning fluid, namely, ultrasonic roughing, ultrasonic cleaning, rinsing, drying, etc.
Four. For those parts with high precision, in order not to collide with each other, and affect the surface accuracy, can be made hoisting spreader or cleaning rack into the cleaning tank.
5. Cleaning accessories can be concentrated in the cleaning basket, and then put into the cleaning pot, of course, cleaning basket nets should be as large as possible, the cleaning frame will block ultrasound, and affect the cleaning effect.
The issues to note are:
1, cleaning parts can be as close as possible to the bottom of the radiation surface, the effect will be better, but be careful not to place them directly on the bottom of the radiation surface, especially the bottom of the installation of ultrasonic sensor ultrasonic cleaning machine, long-term pressure on the radiation surface will lead to heat, directly affect the ultrasonic mechanical vibration, reduce the cleaning effect, ultrasonic energy pressure can not be launched, will also lead to sensor loss.
2, if there is a blind hole in the cleaning component, the blind hole should be filled with cleaning fluid, and then the blind hole pointing down the ultrasonic source. Because of the tension of the water, the liquid does not enter the very small blind hole, and because there is no liquid, the ultrasonic wave can not perform its function, so it is necessary to keep the cleaning fluid in the blind hole filled throughout the cleaning process, to achieve good cleaning effect.
3, for magnetic parts, demagnetization treatment before cleaning, because after ultrasonic cleaning, even if the surface of iron filings is clean, due to the role of magnetism when the workpiece is out.
The temperature of the cleaning fluid in the ultrasonic cleaning machine
During ultrasonic cleaning, the temperature of the cleaning solution has a certain effect on ultrasonic cavitation. It is beneficial to cavitation to raise the working temperature of cleaning fluid properly. The higher the temperature of the cleaning solution (limited), the better the cleaning effect.