Selection of ultrasonic cleaners and cleaning process

Ultrasonic cleaning machine selection and cleaning process one, power selection: ultrasonic cleaning effect is not necessarily proportional to (power x cleaning time), sometimes with small power, it took a long time and did not remove dirt And if the power reaches a certain value, dirt is removed quickly If the choice power is too large, the airing strength will be greatly increased, the cleaning effect is improved, but this time so that the more precise parts also produce erosion points, not worth the loss, and the bottom of the cleaning tank vibration plate cavitation is serious, water point corrosion also increased, in the use of trichloroethylene and other organic solvents, basically no problem, but the use of water or water-soluble cleaning liquid, easy to be water point corrosion, if the surface of the vibration plate has been affected by the actual effect of the oil
Second, frequency selection: ultrasonic cleaning frequency from 28kHz to 120kHz, in the use of water or water cleaning agent caused by the cavitation of the physical cleaning force is obviously beneficial to low frequency, generally using 28-40kHz or so For small gaps, slits, deep holes in the parts cleaning, with high frequency (generally 40kHz or more) better, or even hundreds of kHz When cleaning the clock parts, use 400kHz If the broadband FM cleaning, the effect is better
Third, the use of cleaning baskets: in cleaning small parts of items, often use the net basket, because the mesh to cause ultrasonic attenuation, to attract special attention When the frequency is 28khz, it is good to use more than 10mm mesh
Fourth, the choice of cleaning liquid temperature: water cleaning liquid zui suitable cleaning temperature of 40-60 degrees C, especially in cold weather if the cleaning liquid temperature low-altitude effect is poor, cleaning effect is also poor Therefore, there are some cleaning machine in the outside of the cleaning tank around the heating electric wire for temperature control, when the temperature increases after cavitation is easy to occur, so the cleaning effect is better When the temperature continues to rise, the pressure of the gas in the air bubble increases, causing the shock sound pressure to drop, reflecting the multiplication of the two factors
V The amount of cleaning fluid and the location of cleaning parts to determine: the general cleaning liquid surface is higher than the surface of the vibrator more than 100mm is good Because the single-frequency cleaning machine is affected by the stationing field, the amplitude at the wave section is very small, and the amplitude at the amplitude of the wave is largely caused by uneven cleaning Therefore, zuijia choose swashes the location of the item should be placed at the amplitude
Sixth, ultrasonic cleaning process and cleaning fluid selection: before the purchase of cleaning system, should be cleaned parts to do the following application analysis: clear the composition, structure and quantity of the washing parts, analysis and clear to remove the dirt, these are the decision to use what kind of cleaning methods, to determine the application of water-based cleaning liquid or solvent prerequisites The zui end cleaning process also needs to be verified by cleaning experiments Only in this way can a suitable cleaning system be provided, a well-designed cleaning process and cleaning fluid Considering the effect of the physical properties of the cleaning fluid on ultrasonic cleaning, the steam pressure, surface tension, viscosity and density should be significant factors of zui Temperature can influence these factors, so it also affects the efficiency of cavitation Any cleaning system must use cleaning fluid
When choosing a cleaning solution, the following three factors should be considered: 1 Cleaning efficiency: when choosing zui effective cleaning solvent, be sure to do the experiment If ultrasound 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, simple to operate and long life, 3 Cost: Zui cheap cleaning solvent use costs are not necessarily low zui In use, you must take into account the cleaning efficiency of the solvent, safety, a certain amount of solvent can be cleaned how much workpiece utilization zui and other factors Of course, the cleaning solvent of your choice must have a cleaning effect and be compatible with the workpiece material being cleaned Water is zui ordinary cleaning liquid, so the system using water-based solution is easy to operate, low cost of use, widely used However, for some materials and dirt, etc do not apply to aqueous solutions, there are many solvents available
Seven, different cleaning fluids, to distinguish the cleaning system: water-based system: usually composed of open grooves, workpiece immersion among them The complex system consists of multiple slots and is equipped with a circulating filtration system, a flushing tank, a drying tank and other accessories Solvent system: mostly for ultrasonic vapor phase degrease cleaning machine, often equipped with waste liquid continuous recovery device The ultrasonic vapor removal process is done by an integrated multi-slot system formed by the solvent evaporation tank and the ultrasonic immersion tank Oil, grease, wax, and other solvent-soluble dirt are removed by the combined action of hot solvent steam and ultrasonic shock After a series of cleaning process, the materialing of the workpiece heat, clean, dry
Eight, cleaning parts treatment: ultrasonic cleaning another consideration is the cleaning parts of the top, lower material or is placed cleaning parts of the work design When cleaning parts are in the ultrasonic cleaning tank, neither the cleaning part nor the cleaning part basket shall touch the bottom of the groove The total cross-sectional area of the cleaning parts shall not exceed 70% of the cross-sectional area of the ultrasonic groove Rubber and non-rigid plastics absorb ultrasonic energy, so use such materials for workwear with caution Insulated cleaning parts should also be given special attention The improper design of the workbasket, or the heavy workpiece, even if the efficiency of the ultrasonic cleaning system will be greatly reduced Hooks, shelves, and beakers can all be used to support cleaning parts
Nine, cleaning time, type of workpiece, quantity of clear: the use of considering the way the machine works is fully automatic, semi-automatic, manual The size and cost of the machine
Ten, other: cleaning a large amount of dirt parts generally to use immersion, injection and other methods for pre-cleaning After removing most of the dirt, clean the remaining dirt with ultrasound, and the effect is good If you clean small items and complex shape items (parts), if the use of cleaning nets or make the cleaning material rotate, while vibration with ultrasonic radiation, can be evenly cleaned
It seems that it will take some effort to select a satisfactory ultrasonic cleaning machine