When purchasing an ultrasonic cleaner, the first thing to do is to understand how the product can be washed. The second is to achieve a kind of cleaning effect. The third is to predict how much the company's development will reach. The maximum capacity of the machine is how much, the fourth step is to understand the cleaning process, ask what kind of process is used by the peers, or whether the manufacturer of the ultrasonic wave has updated the cleaning process, and the fifth is to select some professional manufacturers. The cleaning process, price and after-sales service guarantee are compared. The sixth is to write the brand model of the materials used in the equipment, the price of consumables, the maintenance clause, etc. into the contract agreement when signing the contract, in case of fraud of some bad production enterprises. The seventh is the acceptance. If it is a large-scale equipment, you should bring your workpiece to the production company for on-site inspection and acceptance. The eighth is to install the training for your company's employees. You are sure that your employees are really learning instead of The installer said that he has already trained.
Ultrasonic cleaning sometimes uses low power and takes a long time without removing dirt. And if the power reaches a certain value, the dirt is quickly removed. 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, and the vibration plate at the bottom of the cleaning machine will be cavitation severely, and the water point corrosion will also increase. When using an organic solvent such as trichloroethylene, there is basically no problem, but when using water or a water-soluble cleaning solution, it is susceptible to water pitting corrosion. If the surface of the vibrating plate has been scratched, cavitation corrosion is more serious under high power. The ultrasonic power should be selected according to the actual use.
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. When cleaning the watch parts, use 100 kHz. If you use broadband FM cleaning, the effect is better.
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.
Cleaning fluid temperature
The most suitable cleaning temperature for the water cleaning solution is 40-60 Â° 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 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 cavitation increases, causing the impact sound pressure to drop and the effect is also weakened. The organic solvent cleaning solution is washed at a temperature close to the boiling point.
The amount of cleaning fluid and the determination of the location of the cleaning parts
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 at the amplitude is large, resulting in uneven cleaning. Therefore, the best choice for cleaning items should be placed at the volatility. (more effective range 3-18 cm)
Ultrasonic cleaning process and selection of cleaning solution
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. Aqueous cleaning solutions are also a prerequisite for solvents. The final cleaning process also requires a cleaning experiment to verify. 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 the most significant factors. Temperature can affect these factors, so it also affects the efficiency of cavitation. Any cleaning system must use a cleaning fluid.
When choosing a cleaning solution, there are three factors to consider:
1. Cleaning efficiency: When selecting the most effective cleaning solvent, it is necessary to do the experiment. If ultrasound is introduced into an 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: The cost of using the cheapest cleaning solvent is not necessarily the lowest. The cleaning efficiency and safety of the solvent, the amount of solvent that can be cleaned, and the highest 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 the most common cleaning solution, 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. Different cleaning fluids, the washing system to be distinguished from the water system: usually consists of an open tank, 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 cleaning machine, often equipped with waste liquid continuous recovery device. Ultrasonic vapor phase degreasing is accomplished by an integrated multi-slot system of solvent evaporation tanks and ultrasonic immersion tanks. Oil, grease, wax, and other solvent-soluble soils are removed by the combination of hot solvent vapor and ultrasonic agitation. After a series of cleaning processes, the workpieces that are unloaded are heated, cleaned, and dried.
Cleaning parts processing
Another consideration for ultrasonic cleaning is the design of the upper and lower materials of the cleaning member or the tooling in which the cleaning member is placed. 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 â€‹â€‹the cleaning member should not exceed 70% of the cross-sectional area of â€‹â€‹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 best ultrasonic cleaning system is greatly reduced. Hooks, shelves and beakers can be used to support the cleaning parts.
Cleaning time: 3-10 minutes, preferably in a timed manner.
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