First, the choice of power
Ultrasonic cleaning effects are not necessarily proportional to (power x cleaning time), sometimes with low power, and without removing dirt for long periods of time. If the power reaches a certain value, dirt is sometimes removed very quickly. If the power is selected too much, the cavitation strength will be greatly increased, and the cleaning effect will be improved. However, the more accurate parts will also cause pitting, which is not worth the candle. Moreover, 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, basically no problem, but when using water or water-soluble cleaning solution, it is vulnerable to water corrosion, if the vibration plate surface has been damaged, the cavitation corrosion under the strong power of the bottom more Serious, so choose ultrasonic power according to the actual use.
Second, the frequency of choice
The frequency of ultrasonic cleaning is from 28 kHz to 120 kHz. The physical cleaning power caused by cavitation when using water or water cleaner is obviously favorable for low frequency, generally about 28-40 kHz. For parts with small gaps, slits, and deep holes, use high frequency (generally 40 kHz or more), or even hundreds of kHz. When cleaning clock parts, use 400kHz. If you use broadband FM cleaning, the effect is better.
Third, the use of cleaning basket
When cleaning small parts items, a basket is often used, and due to the attenuation of the ultrasound in the mesh, special attention should be paid. Use a mesh of 10mm or more when the frequency is 28khz.
Fourth, the choice of cleaning fluid temperature
The optimum cleaning temperature of the water cleaning solution is 40-60°C, especially if the cleaning solution has a low cavitation effect during cold weather, and the cleaning effect is also poor. Therefore, some of the washing machines are heated on the outside of the cleaning cylinder to control the temperature of the heating wire. When the temperature rises, cavitation occurs, so the cleaning effect is better. When the temperature continues to rise, the gas pressure within the bubble increases, causing the impact sound pressure to drop, reflecting the multiplication of these two factors.
Fifth, on the amount of cleaning fluid and the determination of the location of cleaning parts
Generally, the liquid level of the cleaning liquid is preferably more than 100 mm above the surface of the vibrator. Because the single-frequency cleaning machine is affected by the standing wave field, the amplitude at the nodes is very small, and amplitude is large at the wave amplitude to cause uneven cleaning. Therefore, the best choice for cleaning items should be placed at the amplitude.
Six, ultrasonic cleaning process and cleaning fluid selection
Before purchasing the ultrasonic cleaning system, the following applications should be analyzed for the parts to be cleaned: the material composition, structure and quantity of the parts to be cleaned, the analysis and identification of the dirt to be removed, these are all decisions on what kind of cleaning method to use, judgement The use of aqueous cleaning solutions is also a prerequisite for the use of solvents. The final cleaning process needs to be verified by a cleaning experiment. Only in this way can a suitable cleaning system, a well-designed cleaning process and a cleaning fluid be provided. Taking into account the physical characteristics of the cleaning fluid on the impact of ultrasonic cleaning, which steam pressure, surface tension, viscosity and density should be the most significant factor. Temperature can affect these factors, so it also affects the efficiency of cavitation. Any cleaning system must use cleaning fluid. When choosing a cleaning fluid, consider the following three factors:
1. Cleaning efficiency: When selecting the most effective cleaning solvent, be sure to do the experiment. If ultrasound is introduced into the existing cleaning process, the solvent used does not generally need to be changed;
2. Simple operation: The used liquid should be safe, nontoxic, easy to operate and have a long service life;
3. Cost: The use cost of the cheapest cleaning solvent is not necessarily the lowest. The use of solvents must take into account factors such as solvent cleaning efficiency, safety, and how much a certain amount of solvent can be cleaned. Of course, the selected cleaning solvent must achieve the cleaning effect and should be compatible with the cleaned workpiece material. 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 some materials, dirt, etc., which are not suitable for aqueous solutions, there are many solvents available.
Seven different cleaning fluids, to distinguish the cleaning system
Waterborne system: Usually consists of an open trough, in which the workpiece is immersed. 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: It is mostly an ultrasonic vapor phase degreasing cleaner, and it is often equipped with a waste liquid continuous recovery device. The ultrasonic vapor phase removal process is accomplished by an integrated multi-slot system formed by a solvent evaporation tank and an ultrasonic immersion tank. With the combination of hot solvent vapors and sonication, oils, greases, waxes, and other solvent-soluble dirt are removed. After a series of cleaning processes, the blanked workpiece heats, cleans, and dries.
Eight, cleaning parts processing
Another consideration for ultrasonic cleaning is the design of the cleaning tool for the loading and unloading of the cleaning tool, or the tooling for placing the cleaning tool. When the cleaning part is in the ultrasonic cleaning tank, neither the cleaning part nor the cleaning basket must touch the bottom of the tank. The total cross-sectional area of ​​the washware 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 in tooling. Insulated cleaning parts should also pay special attention. Improperly designed baskets or too heavy workpieces can reduce the efficiency of the best ultrasonic cleaning system. Hooks, shelves, and beakers can be used to support the washware.
Nine, cleaning time, the type of workpiece, the number of clear
※ Consider the use of the machine working method is fully automatic, semi-automatic, manual.
※The size and cost of the machine.
Ten, other
Cleaning large amounts of dirt parts generally use dip, spray and other methods for pre-cleaning. After removing most of the dirt, the remaining dirt is cleaned with ultrasonics, which is effective. If small items and complex shaped articles (parts) are to be cleaned, if a cleaning net is used or the cleaning object is rotated, it can be evenly cleaned using ultrasonic radiation while vibrating.
Ultrasonic cleaning effects are not necessarily proportional to (power x cleaning time), sometimes with low power, and without removing dirt for long periods of time. If the power reaches a certain value, dirt is sometimes removed very quickly. If the power is selected too much, the cavitation strength will be greatly increased, and the cleaning effect will be improved. However, the more accurate parts will also cause pitting, which is not worth the candle. Moreover, 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, basically no problem, but when using water or water-soluble cleaning solution, it is vulnerable to water corrosion, if the vibration plate surface has been damaged, the cavitation corrosion under the strong power of the bottom more Serious, so choose ultrasonic power according to the actual use.
Second, the frequency of choice
The frequency of ultrasonic cleaning is from 28 kHz to 120 kHz. The physical cleaning power caused by cavitation when using water or water cleaner is obviously favorable for low frequency, generally about 28-40 kHz. For parts with small gaps, slits, and deep holes, use high frequency (generally 40 kHz or more), or even hundreds of kHz. When cleaning clock parts, use 400kHz. If you use broadband FM cleaning, the effect is better.
Third, the use of cleaning basket
When cleaning small parts items, a basket is often used, and due to the attenuation of the ultrasound in the mesh, special attention should be paid. Use a mesh of 10mm or more when the frequency is 28khz.
Fourth, the choice of cleaning fluid temperature
The optimum cleaning temperature of the water cleaning solution is 40-60°C, especially if the cleaning solution has a low cavitation effect during cold weather, and the cleaning effect is also poor. Therefore, some of the washing machines are heated on the outside of the cleaning cylinder to control the temperature of the heating wire. When the temperature rises, cavitation occurs, so the cleaning effect is better. When the temperature continues to rise, the gas pressure within the bubble increases, causing the impact sound pressure to drop, reflecting the multiplication of these two factors.
Fifth, on the amount of cleaning fluid and the determination of the location of cleaning parts
Generally, the liquid level of the cleaning liquid is preferably more than 100 mm above the surface of the vibrator. Because the single-frequency cleaning machine is affected by the standing wave field, the amplitude at the nodes is very small, and amplitude is large at the wave amplitude to cause uneven cleaning. Therefore, the best choice for cleaning items should be placed at the amplitude.
Six, ultrasonic cleaning process and cleaning fluid selection
Before purchasing the ultrasonic cleaning system, the following applications should be analyzed for the parts to be cleaned: the material composition, structure and quantity of the parts to be cleaned, the analysis and identification of the dirt to be removed, these are all decisions on what kind of cleaning method to use, judgement The use of aqueous cleaning solutions is also a prerequisite for the use of solvents. The final cleaning process needs to be verified by a cleaning experiment. Only in this way can a suitable cleaning system, a well-designed cleaning process and a cleaning fluid be provided. Taking into account the physical characteristics of the cleaning fluid on the impact of ultrasonic cleaning, which steam pressure, surface tension, viscosity and density should be the most significant factor. Temperature can affect these factors, so it also affects the efficiency of cavitation. Any cleaning system must use cleaning fluid. When choosing a cleaning fluid, consider the following three factors:
1. Cleaning efficiency: When selecting the most effective cleaning solvent, be sure to do the experiment. If ultrasound is introduced into the existing cleaning process, the solvent used does not generally need to be changed;
2. Simple operation: The used liquid should be safe, nontoxic, easy to operate and have a long service life;
3. Cost: The use cost of the cheapest cleaning solvent is not necessarily the lowest. The use of solvents must take into account factors such as solvent cleaning efficiency, safety, and how much a certain amount of solvent can be cleaned. Of course, the selected cleaning solvent must achieve the cleaning effect and should be compatible with the cleaned workpiece material. 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 some materials, dirt, etc., which are not suitable for aqueous solutions, there are many solvents available.
Seven different cleaning fluids, to distinguish the cleaning system
Waterborne system: Usually consists of an open trough, in which the workpiece is immersed. 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: It is mostly an ultrasonic vapor phase degreasing cleaner, and it is often equipped with a waste liquid continuous recovery device. The ultrasonic vapor phase removal process is accomplished by an integrated multi-slot system formed by a solvent evaporation tank and an ultrasonic immersion tank. With the combination of hot solvent vapors and sonication, oils, greases, waxes, and other solvent-soluble dirt are removed. After a series of cleaning processes, the blanked workpiece heats, cleans, and dries.
Eight, cleaning parts processing
Another consideration for ultrasonic cleaning is the design of the cleaning tool for the loading and unloading of the cleaning tool, or the tooling for placing the cleaning tool. When the cleaning part is in the ultrasonic cleaning tank, neither the cleaning part nor the cleaning basket must touch the bottom of the tank. The total cross-sectional area of ​​the washware 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 in tooling. Insulated cleaning parts should also pay special attention. Improperly designed baskets or too heavy workpieces can reduce the efficiency of the best ultrasonic cleaning system. Hooks, shelves, and beakers can be used to support the washware.
Nine, cleaning time, the type of workpiece, the number of clear
※ Consider the use of the machine working method is fully automatic, semi-automatic, manual.
※The size and cost of the machine.
Ten, other
Cleaning large amounts of dirt parts generally use dip, spray and other methods for pre-cleaning. After removing most of the dirt, the remaining dirt is cleaned with ultrasonics, which is effective. If small items and complex shaped articles (parts) are to be cleaned, if a cleaning net is used or the cleaning object is rotated, it can be evenly cleaned using ultrasonic radiation while vibrating.
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