How do I choose the right ultrasonic cleaning machine?
Ultrasonic procurement, attention in 8 items!
1. The choice of ultrasonic power
Ultrasonic cleaning is not necessarily proportional to (power × cleaning time), sometimes with low power, and it takes a long time to remove dirt. And if the power reaches a certain value, the dirt is sometimes removed quickly. If the power is too large, the hole strength will be greatly increased, and the cleaning effect will be improved. However, the more precise parts will also have an etch point, which is not worth the loss.
Moreover, the cavities at the bottom of the cleaning tank are severe, and the water point corrosion is also increased. When using organic solvents such as trichloroethylene, there is basically no problem. If the surface of the vibrating plate has been damaged, and cavitation corrosion caused by water bottom is more serious under high power, so the ultrasonic power should be selected according to the actual use situation.
2. Frequency choice
Ultrasonic cleaning frequency is from 28 kHz to 120 kHz. The physical cleaning force caused by cavitation when using water or water cleaning agent is obviously beneficial to low frequency, generally about 28-40 kHz. For parts with small gaps, slits and deep holes, it is better to use high frequency (generally 40 kHz or more), even several hundred kHz. If you use wideband frequency cleaning, the effect is better.
3. The use of the cleaning basket
When cleaning small parts, the basket is often used, and it is particularly noticeable because the mesh is causing ultrasonic attenuation. It is better to use a mesh of 10 mm or more when the frequency is 28 khz.
4. Cleaning fluid temperature choice
The most suitable cleaning temperature for the water cleaning solution is 40-60 ° C. Especially in the case of cold weather, if the temperature of the cleaning solution is low, the cavitation effect is poor, and the cleaning effect is also poor. Therefore, Some washing machines have heating wires wound around the washing tank for temperature control
5. Determination the amount on cleaning fluid and the cleaning parts location
Generally, the liquid level of the cleaning liquid is preferably more than 100 mm above the surface of the vibrating body. Since the single-frequency cleaning machine is affected by the standing wave field, the amplitude of the node is small, and the amplitude is large, resulting in uneven cleaning. Therefore, the best choice for cleaning items should be placed at the volatility.
6. Ultrasonic cleaning workpiece and cleaning fluid choice
Before purchasing the cleaning system, the following application analysis should be carried out on the parts to be cleaned: clarify the material composition, structure and quantity of the parts to be washed, and analyze and clarify the dirt to be removed. These are all deciding which cleaning methods to use and judging the application. It’s a prerequisite for choosing the Aqueous cleaning solutions or solvents.
7. The cleaning system need to be distinguished with different cleaning fluids
Aqueous system: usually consists of an open tank, the workpiece is immersive. The complex system consists of multiple tanks and is equipped with a loop filter system, a shower tank, a drying tank and other accessories.
Solvent system: Mostly ultrasonic ultrasonic grease removal machine, often equipped with waste liquid continuous recovery device. Ultrasonic vapor phase degreasing process is accomplished by an integrated multi-tank system consisting of a solvent distillation recovery tank and a ultrasonic & bath tank.
8. Cleaning parts processing
Another consideration for ultrasonic cleaning is the design for the loading and unloading of the cleaning workpiece. When the cleaning parts are in the ultrasonic cleaning tank, the cleaning parts and the cleaning basket must not touch the bottom of the tank. The total cross-sectional area of the cleaning workpiece should not exceed 70% of the cross-sectional area of the ultrasound tank. Rubber and non-rigid plastics absorb ultrasonic energy, so be careful when using such materials for workpiece. Insulating cleaning parts should also be given special attention. The basket is not designed properly, or the workpiece is too heavy, even though the efficiency of the best ultrasonic cleaning system is greatly reduced. Hooks, shelves and beakers can be used to support the cleaning parts.
9. Cleaning time, type of workpiece and quantity
The use of the machine's working mode are including fully automatic, semi-automatic, and manual. Machine size and cost.
Parts that are cleaned in large amounts of dirt are generally pre-cleaned by dipping, spraying, etc. After removing most of the dirt, the remaining dirt is washed with ultrasounds, and the effect is good. If you clean small items and complicated shapes (parts), and use a cleaning net or rotate the cleaning object, you can use ultrasound to vibrate the workpiece and get uniform cleaning