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Second, the frequency selection: ultrasonic cleaning frequency from 28kHz to 120kHz, the physical cleaning force caused by the action of holes when using water or water cleaning agent is obviously beneficial to the low frequency, generally using about 28-40kHz. 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. When cleaning the watch parts, use 400 kHz. If you use broadband FM cleaning, the effect is better.
Third, the use of the cleaning basket: in the cleaning of small parts, often use the basket, because the mesh to cause ultrasonic attenuation, to pay special attention. It is better to use a mesh of 10 mm or more when the frequency is 28 khz.
Fourth, the choice of cleaning fluid temperature: water cleaning solution zui suitable cleaning temperature is 40-60 ° C, especially in the cold weather, if the cleaning solution temperature is low, the cavitation effect is poor, the cleaning effect is also poor. Therefore, some washing machines are wound around the heating cylinder to heat the heating wire for temperature control. When the temperature rises, cavitation is easy to occur, so the cleaning effect is good. When the temperature continues to rise, the gas pressure in the vacuole increases, causing the impact sound pressure to drop, reflecting the multiplication of these two factors.
5. How much the amount of cleaning liquid and the position of the cleaning parts are determined: Generally, the liquid level of the cleaning liquid is higher than the surface of the vibrating surface by more than 100 mm. Since the single-frequency cleaning machine is affected by the standing wave field, the amplitude at the node is small, and the amplitude at the amplitude is large, resulting in uneven cleaning. Therefore, Zui Jia chooses to clean the position of the item should be placed at the volatility.
Sixth, the ultrasonic cleaning process and the choice of cleaning fluid: Before purchasing the cleaning system, the following application analysis should be carried out on the cleaned parts: the material composition, structure and quantity of the washed parts are clearly defined, and the dirt to be removed is analyzed and clearly identified. Decide which cleaning method to use and determine the preconditions for applying the aqueous cleaning solution or solvent. The final cleaning process of zui also needs to be verified by cleaning experiments. Only in this way can a proper cleaning system, a well-designed cleaning process and a cleaning solution be provided. Considering the influence of the physical properties of the cleaning solution on ultrasonic cleaning, the vapor pressure, surface tension, viscosity and density should be significant factors influencing Zui. Temperature can affect these factors, so it also affects the efficiency of cavitation. Any cleaning system must use a cleaning fluid.
When selecting a cleaning solution, the following three factors should be considered: 1. Cleaning efficiency: When selecting an effective cleaning solvent for zui, it is necessary to do the experiment. If ultrasonic is introduced into the existing cleaning process, the solvent used generally does not have to be changed; 2. Simple operation: the liquid used should be safe and non-toxic, easy to operate and long in service life; 3. Cost: cheap cleaning solvent for zui The cost of use is not necessarily low. The cleaning efficiency and safety of the solvent, the amount of solvent that can be cleaned, and the high utilization rate of the workpiece must be taken into consideration. Of course, the cleaning solvent chosen must achieve a cleaning effect and should be compatible with the material being cleaned. Water is a common cleaning solution for Zui, so the system using water-based solution is easy to operate, low in cost, and widely used. However, for certain materials, as well as dirt and the like, which are not suitable for aqueous solutions, there are many solvents to choose from.
Seven, different cleaning fluids, the cleaning system to be distinguished: water-based system: usually consists of open grooves, the workpiece is submerged. The complex system consists of multiple tanks and is equipped with a circulating filtration system, a shower tank, a drying tank and other accessories. Solvent system: mostly ultrasonic vapor phase degreasing machine, often equipped with continuous waste recovery device. The ultrasonic vapor phase degreasing process is accomplished by an integrated multi-slot system formed by a solvent evaporation tank and an ultrasonic immersion tank. Oil, grease, wax, and other solvent-soluble soils are removed by the action of hot solvent vapor and ultrasonic agitation. After a series of cleaning processes, the workpieces that are unloaded are heated, cleaned, and dried.
8. Cleaning parts processing: Another consideration for ultrasonic cleaning is the design of the upper and lower materials of the cleaning parts or the tooling for placing the cleaning parts. 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 member should not exceed 70% of the cross-sectional area of ​​the ultrasonic bath. Rubber and non-rigid plastics absorb ultrasonic energy, so care should be taken when using such materials for tooling. Insulating cleaning parts should also be given special attention. The tool basket is not designed properly, or the workpiece is too heavy, even though the efficiency of the good ultrasonic cleaning system is greatly reduced. Hooks, shelves and beakers can be used to support the cleaning parts.
Nine, the cleaning time, the type of the workpiece, the quantity is clear: ※ Consider the use of the machine working mode is fully automatic, semi-automatic, manual. ※ Machine size and cost.
X. Others: Parts that are cleaned of large amounts of dirt are generally pre-cleaned by dipping, spraying, etc. After removing most of the dirt, the remaining dirt is ultrasonically cleaned, and the effect is good. If you clean small items and items (parts) with complicated shapes, if you use a cleaning net or rotate the cleaning object, you can use ultrasonic radiation while vibrating to get even cleaning.
It seems that it takes a lot of effort to select a satisfactory ultrasonic cleaner.
Ultrasonic cleaning machine selection and cleaning process
And selecting <br> <br> a cleaning process, the power of ultrasonic cleaning machine selection: ultrasonic cleaning effect is not necessarily the (power × cleaning time) is proportional, sometimes with small power, not take 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 cavitation intensity 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, and the cavitation at the bottom of the cleaning cylinder is severe, and the water point corrosion is also increased. Large, when using organic solvents such as trichloroethylene, there is basically no problem, but when using water or water-soluble cleaning solution, it is easy to be affected by water spots. If the surface of the vibrating plate has been scratched, cavitation corrosion occurs under the high power. Severe, so choose the ultrasound power according to the actual use.