How do I know if my ultrasonic cleaning system is working properly?
Evaluating whether an ultrasonic cleaning system is working properly There is currently no universal quantitative standard that is commonly used. Relatively used methods are commonly used in the "aluminum foil test method" and "graphite slide test method" and some use hydrometer The method of testing. The above methods are all used as relative testing methods. In the actual test process, the results of the test due to factors such as the temperature test water level cleaning solution have only reference value. As an example of our product, an intuitive two-color strip color meter is set on the device control panel. The intuitive display setting and output current relationship can be used as a reference for evaluating the working status of the ultrasonic system. The new products being developed are also equipped with interactive display direct digital display, current current, voltage, frequency running time and other parameters. An accurate understanding of the operating state of the ultrasonic system is required as an alternative to detecting the output power of the ultrasonic power supply and accurately determining the electromechanical conversion parameters of the transducer so that accurate quantized parameters can be obtained.
What is the frequency of my artifacts?
Different cleaning requirements require different ultrasonic frequencies. Lower ultrasonic frequencies indicate larger cavitation bubbles and more intense cavitation internal fracture. At higher frequencies the cavitation bubbles are much smaller and although the cavitation within the cavitation is less intense. The lower the ultrasonic frequency, the more the cavitation generated in the liquid is, and the stronger the force is, the stronger the effect is, and it is suitable for coarse and dirty initial washing of the workpiece. When the frequency is high, the ultrasonic direction is strong and it is suitable for fine object cleaning. When the ultrasonic working frequency is low, the working noise is large, and the noise is significantly reduced as the operating frequency is increased. Common frequencies used in the industry are 16, 18, 20, 25, 28, 40 kHz. The choice of frequency needs to be determined based on practical experience and process tests. Choosing errors can cause a lot of trouble. For example, a silicon wafer with a 28 kHz frequency cleaning tends to be broken, while a ferrite permanent magnet material with a 40 kHz cleaning often has little effect.
How to achieve the best cleaning results?
Use a suitable cleaning solution, appropriate ultrasonic cleaning frequency, and a suitable process. In general, the cleaning of the workpiece should not be too far from the radiation surface of the ultrasonic wave. According to our experience, the distance of 20-200mm is the best, and the effect within 600mm is acceptable.
Why was my artifact cleaned yesterday and not cleaned today?
The simple answer is that some factors have changed. First, we must eliminate the problem of the ultrasonic part. For our equipment, it is required to determine that the output power of the ultrasonic wave is basically normal, and the workpiece cleaning is not clean. Most of the time, the customer first suspects the ultrasonic system, but the result is mostly No; the ultrasonic system is only a part of the cleaning operation, and other factors affecting the cleaning time, the temperature of the cleaning fluid, the cleanliness of the cleaning fluid, and the degree of contamination of the workpiece. The most common problem is that the cleaning fluid is contaminated.
Can I use solvent cleaning in my ultrasonic cleaning equipment?
Most of the current ultrasonic cleaning machines are designed for aqueous cleaning. Solvent cleaning requires a dedicated "gas phase" cleaning machine. Ordinary washing machines use solvent cleaning. Because ultrasonic waves have a certain amount of energy converted into heat energy, it is easy to cause a large amount of solvent to volatilize, spread into the air, cause solvent waste, and endanger the health of operators. The "gas phase" cleaning machine is equipped with a condensing coil on the basis of the ordinary cleaning machine to form a cold air barrier layer to ensure that the solvent is substantially free of volatiles.
For some "IPA" (isopropyl alcohol) commonly used in the electronics industry, cleaning agents such as volatile oils, in order to slow down the heating solution heating rate and reduce the volatilization loss, it is also possible to install internal condensation through the cooling water in the cleaning solution. The coil controls the temperature of the cleaning fluid.
Is ultrasound harmful to human hearing? Does it have other effects on the human body?
Ultrasonic cleaning uses sound waves that exceed the human auditory frequency to act on the cleaning fluid, achieving a series of physicochemical effects. Since its working frequency is beyond the audible threshold of the human ear, most people do not feel its influence; generally we listen It is the sound generated by the resonance of external components such as water tanks. These sound frequencies are half or even lower than the ultrasonic working frequency; this part of the noise is audible to humans.
Under normal circumstances, the better designed ultrasound system can not be considered for human hearing or human body. For some devices with higher power or lower frequency, it can generally be solved by closing the working environment and wearing anti-noise headphones.
What is “degassing†and why is it important?
Degassing is a process of removing dissolved or free tiny gases in the cleaning solution. If too many of these gases are present in the cleaning solution, the effect of ultrasonic cavitation will be affected.
Degassing can be carried out by raising the temperature of the cleaning solution, adding chemicals, and treating the cleaning solution with low-power ultrasound. For some special cleaning agents, vacuum degassing devices can also be used.
Why do I need to rinse after the workpiece is cleaned?
After cleaning the workpiece, some cleaning liquid and residuals may remain on the surface. In order to remove these residues, the workpiece is generally rinsed with deionized water or clean water. The principle of rinsing is to increase the surface of the workpiece and clean it as much as possible. The contact opportunity of the rinsing liquid is generally a special overflow technique, and techniques such as spraying, air bubbling, and workpiece fretting are preferable.
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Label: Ultrasonic cleaning system FAQ
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