Eight steps to make your heart purchase ultrasonic cleaning machine
When purchasing an ultrasonic cleaner, the first thing to know is how to wash your product. The second is to achieve a kind of cleaning effect. The third is to predict how much the company's development will reach. The machine production capacity is 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 production enterprises. In the comparison of cleaning process, price and after-sales service guarantee, 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 workpieces 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 have really learned. Not the installer said that it has been trained.
Power Selection Ultrasonic cleaning sometimes uses low power and takes a long time without removing dirt. 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 also have an etch point, and the vibration plate at the bottom of the cleaning machine is cavitation and the water point corrosion is also increased. 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.
Frequency selection
Ultrasonic cleaning frequencies range from 28 kHz to 120 kHz. The physical cleaning forces caused by cavitation when using water or water cleaners are clearly beneficial for low frequencies, typically around 28-40 kHz. For parts with small gaps, slits and deep holes, it is better to use high frequency (generally above 40 kHz), even hundreds of kHz. Use 100 kHz for cleaning watch parts. 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 liquid temperature water cleaning solution zui suitable cleaning temperature is 40-60 ° C, especially in the case of cold weather, if the cleaning liquid temperature 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 bubble 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 higher than the surface of the vibrating body by 100 mm or more. 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. (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, analyze and clarify the dirt to be removed, which are all deciding which cleaning method to use and judging the application. Aqueous cleaning solutions are also a prerequisite for solvents. 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 choosing a cleaning solution, there are three factors to consider:
1 . Cleaning efficiency: When selecting zui 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 inexpensive cleaning solvents 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. Different cleaning solutions, different cleaning systems. Water-based systems: usually consisting of open channels, the workpiece is submerged. The complex system consists of multiple tanks with a circulation 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-tank 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 ​​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.
Cleaning time: 1-10 minutes, good time to clean.
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