First, the choice of power. The ultrasonic cleaning effect is not necessarily proportional to (power × cleaning time). Sometimes, with low power and a long time, dirt can be removed effectively. When the power reaches a certain level, dirt can be removed quickly. However, if the power is too high, cavitation intensity increases significantly, which may enhance the cleaning effect but also cause etching on precision parts, leading to damage that outweighs the benefits. Cavitation at the bottom of the cleaning tank becomes more severe, increasing water spot corrosion. Using organic solvents like trichloroethylene generally has no issues, but when using water or water-soluble cleaning solutions, water spots are more likely to form. If the surface of the vibrating plate is scratched, cavitation corrosion under high power can be severe. Therefore, it's essential to choose the ultrasound power based on actual usage conditions.
Second, the choice of frequency. Ultrasonic cleaning frequencies typically range from 28 kHz to 120 kHz. The physical cleaning force caused by cavitation is more beneficial for low frequencies, usually around 28-40 kHz, especially when using water or water-based cleaning agents. For parts with small gaps, slits, and deep holes, high frequency (generally 40 kHz or higher) is better, even up to several hundred kHz. For example, when cleaning watch parts, 400 kHz is often used. Broadband FM cleaning can further improve the results.
Third, the use of the cleaning basket. When cleaning small parts, baskets are commonly used. However, the mesh in the basket can cause ultrasonic attenuation. It is better to use a mesh of 10 mm or larger when the frequency is 28 kHz.
Fourth, the choice of cleaning fluid temperature. The most suitable temperature for water-based cleaning solutions is between 40°C and 60°C. In cold weather, if the solution is too cold, cavitation effects may be poor, reducing cleaning efficiency. Some machines include heating elements to control temperature. As temperature rises, cavitation becomes easier, improving the cleaning effect. However, if the temperature continues to increase, gas pressure in the bubbles rises, reducing impact sound pressure. These two factors must be balanced.
Fifth, determining the amount of cleaning fluid and the location of the cleaning parts. The liquid level should be more than 100 mm above the surface of the vibrating body. Single-frequency cleaning machines may suffer from standing wave fields, causing uneven cleaning. To achieve uniform results, items should be placed where the amplitude is highest.
Sixth, the ultrasonic cleaning process and selection of cleaning fluid. Before purchasing a cleaning system, it is important to analyze the materials, structure, and quantity of the parts to be cleaned. Identifying the contaminants is crucial for deciding whether to use an aqueous solution or a solvent. A cleaning experiment is necessary to verify the final process. Physical properties of the cleaning fluid, such as vapor pressure, surface tension, viscosity, and density, significantly affect the cleaning process. Temperature also plays a role in cavitation efficiency.
Seventh, different cleaning fluids require different cleaning systems. Aqueous systems typically consist of open troughs or multi-tank setups with filtration and drying features. Solvent systems, such as ultrasonic vapor phase degreasers, often include waste recovery devices and multiple slots for effective cleaning of oils, greases, and waxes.
Eighth, processing of cleaning parts. When placing parts in the cleaning tank, they should not touch the bottom. The total cross-sectional area of the parts should not exceed 70% of the tank’s area. Materials like rubber and non-rigid plastics absorb ultrasonic energy, so caution is needed. Insulating parts require special attention. Proper tooling, such as hooks, shelves, and beakers, ensures efficient cleaning.
Ninth, cleaning time, type of workpiece, and quantity. The machine's working mode—fully automatic, semi-automatic, or manual—should match the application. Machine size and cost are also important considerations.
Tenth, other considerations. Parts heavily contaminated should be pre-cleaned with dipping or spraying before ultrasonic cleaning. For small or complex-shaped items, using a cleaning net or rotating the object helps ensure even ultrasonic radiation.
Oem Solutions,Thermal Imaging Core,Thermal Imaging Sensor,Thermal Imaging Oem Sensor
Hope Wish Photoelectronic Technology Co., Ltd , https://www.irhpws.com