Ultrasonic cleaning technology works by propagating high-frequency sound waves through a liquid, causing both the liquid and the cleaning tank to vibrate at the same ultrasonic frequency. Each material has its own natural resonance frequency, and when this frequency matches the ultrasonic wave frequency, it produces a humming sound that can be heard. As the ultrasonic cleaning industry continues to evolve, more industries and companies are adopting ultrasonic cleaners for their efficiency and effectiveness.
The process begins with an ultrasonic generator producing high-frequency electrical signals, which are then converted into mechanical vibrations by a transducer. These vibrations travel through the cleaning solution, creating thousands of tiny bubbles ranging from 50 to 500 micrometers in size. Under the influence of the sound field, these bubbles form, grow, and collapse in a cycle known as cavitation. During the collapse, a powerful shockwave is generated, reaching pressures of several thousand atmospheres and temperatures of hundreds of degrees Celsius. This intense energy helps break down and remove dirt, oil, and other contaminants from the surface of the objects being cleaned.
Before coating, parts often need to be cleaned thoroughly to remove substances like core oil (also known as grinding oil), fingerprints, and dust. The cleanliness of the lens is critical during the coating process, so choosing the right cleaning agent is essential. The agent must not only be effective at removing contaminants but also safe for the materials being cleaned, avoiding corrosion or damage.
Low-frequency ultrasonic cleaners, typically operating below 20 kHz, can produce significant noise, sometimes exceeding occupational safety standards. In applications where strong cleaning power is needed without damaging the workpiece, frequencies between 20 kHz and 30 kHz are commonly used. These are ideal for large, heavy-duty items. On the other hand, higher frequencies are preferred for delicate components or when surface damage must be avoided.
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