Choice of power

The effect of an ultrasonic cleaning machine is not necessarily positively correlated with (power x cleaning time) . Using low power, it takes a long time and does not completely remove stains. But if the power reaches the specified value, then it will not be long to remove the stain. If the power is too high, the cavitation strength will be greatly increased, and the cleaning effect will be improved, but at this time, the more precise parts will also have corrosion spots, because of small loss, and the bottom of the cleaning cylinder vibration plate cavitation serious, water corrosion also increased, the use of organic solvents such as trichloroethene is generally safe, but the use of water or water-soluble cleaning solutions is prone to water point corrosion, if the surface of the vibrating plate has been damaged, the cavitation corrosion under strong power is serious, so the ultrasonic power should be selected according to the actual situation.

Second, the choice of frequency

Ultrasonic cleaning machine frequency between 28 khz and 120 khz, when using water or water cleaning agent due to cavitation caused by the physical cleaning force is obviously beneficial to the low frequency, generally choose about 28-40 khz. For small clearance, slit, deep hole parts cleaning, with high frequency (usually more than 40 kHz) better, even hundreds of kHz. When cleaning clock parts, use 40kHz. If the use of broadband FM cleaning, better results.

Third, the production of cleaning basket

In the cleaning of small parts, often use basket, because the mesh to cause ultrasonic attenuation, need special attention. When the frequency is 28 khz, it is better to use more than 10 mm mesh.

Choice of temperature of cleaning fluid

The optimum cleaning temperature of water cleaning solution is 40-60 ° C, especially in the cold weather if the cleaning solution temperature low cavitation effect is poor, cleaning effect is also very poor. Therefore, some of the washing machine in the washing cylinder outside the heating wire heating temperature control, when the temperature increases cavitation easy to appear, so the cleaning effect is better. When the temperature continues to rise, the gas pressure in the bubble increases, causing the sound pressure to drop, which shows the multiplicative effect of these two factors.

There is a clear position for cleaning parts

Usually, the level of the cleaning fluid is 100mm above the surface of the vibrator. Because of the influence of standing wave field, the amplitude of wave joint is very small, and the amplitude of wave joint is large, which results in uneven cleaning. Therefore, the best choice for cleaning the position of items to be placed in the amplitude.

Ultrasonic cleaning process and cleaning fluid selection

Before selecting the ultrasonic cleaning machine system, solve the problem of the parts to do the following application analysis: establish the material composition, structure and quantity of the parts to be washed, analyze and identify the dirt to be thoroughly removed, these are all prerequisites for determining what cleaning methods are required and for determining the best use of organic solvents for water-based cleaning solutions. The final cleaning process also needs to do cleaning experiments to verify. Only in this way can the appropriate cleaning equipment, reasonable design of the cleaning process and its cleaning fluid. The influence of physical properties of cleaning fluid on ultrasonic cleaning is fully considered, and the vapor pressure, interfacial tension, viscosity and density are the most obvious factors. Temperature may affect a variety of factors, so it also affects the efficiency of cavitation. Any cleaning equipment must use cleaning fluid.

Cleaning parts processing

Another standard of reference for ultrasonic cleaning machines is the design of the upper and lower materials of the cleaning parts, or the tooling for placing the cleaning parts. When the cleaning part is in the ultrasonic cleaning trough, neither the cleaning part nor the cleaning basket may touch the bottom of the trough. The total cross-sectional area of the cleaning part shall not exceed 70% of the cross-sectional area of the ultrasonic groove. Rubber and its non-toughened plastics absorb ultrasonic energy, so care should be taken when using such materials in tooling. Attention should also be paid to insulating cleaning elements. The efficiency of even a good ultrasonic cleaning system can be greatly reduced by an unreasonable design of the tool basket or by heavy cleaning elements. Hooks, shelves and beakers are clean.

Other parts that clean a lot of stains

Usually choose to soak, spray and other methods for pre-cleaning. In the removal of most of the stains, continue to use ultrasonic cleaning the remaining stains, the effect is obvious. If the cleaning of small items and complex-shaped items (parts) , if the use of cleaning nets or make the cleaning of rotation, while vibration with ultrasonic radiation, can be evenly clean.