Selection of ultrasonic frequency.RF resin welding machine Production

　　Generally speaking, cleaning machines with a frequency of 28KHZ are commonly used in industries such as hardware, machinery, automotive, and compressors. The KHZ high-frequency ultrasonic cleaning machine, which uses optical optoelectronic cleaning and circuit board cleaning, is suitable for fine cleaning of computers and microelectronic components. Zhaohe ultrasonic cleaning is suitable for cleaning integrated circuit chips, silicon wafers, and thin films. It can remove micron and submicron scale dirt without damaging cleaning components. For some precision cleaning applications such as liquid crystals, semiconductors, etc., using traditional frequencies not only fails to meet the cleaning requirements, but may also cause damage to the workpiece. A typical example is about military electronic products, where the industry clearly defines traditional frequency (20-30KHz) ultrasonic cleaning machines. In fact, in some developed countries, such as Europe and the United States, high-frequency cleaning machines (80KHz or above frequencies, some have reached 200K or 400K) have solved this problem.

　　So why can high-frequency cleaning avoid damaging the workpiece? As is well known, the basic principle of ultrasonic cleaning is based on the cavitation effect of liquids. In fact, the intensity of cavitation effect is directly related to frequency. The higher the frequency, the smaller the cavitation bubbles, the weaker the cavitation intensity, and the weaker the cavitation intensity. For example, if the ratio of 25KHz cavitation intensity to 140KHz cavitation intensity is 1/8, and reaches 80KHz, when the cavitation intensity drops to 0,. 02. Therefore, if the correct frequency is chosen, there will be no problem of ultrasonic damage to the workpiece.

　　It can be seen that there is a close relationship between the ultrasonic cavitation threshold and the frequency of the ultrasonic composite machine. The higher the frequency, the higher the cavitation valve. In other words, at lower frequencies, cavitation is more likely to occur, and at lower frequencies, the compression and sparsity effects on the liquid have a longer time interval, allowing bubbles to grow to larger sizes before collapse, improving cavitation intensity and facilitating cleaning. So low-frequency ultrasonic cleaning is suitable for situations where the surface of large components or the surface of dirt and cleaning parts have a high degree of adhesion. But the surface of easily corroded cleaning parts is not suitable for cleaning components with high surface smoothness, and there is also high cavitation noise. At a frequency of around 40KHZ, under the same sound intensity, more cavitation bubbles are generated than at a frequency of 20KHZ, with strong penetration. It is suitable for cleaning workpieces with complex surface shapes or blind holes. The cavitation noise is small, but the cavitation intensity is low, making it suitable for cleaning situations where the adhesion between dirt and the surface of the cleaned part is weak.

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