Knowledge | 2022-10-19
How to clean cemented carbide? Fast cleaning of ultrasonic cleaning machine
Cemented carbide is a high-productivity tool material. It is Powder metallurgy of metal carbide powder with high melting point and hardness mixed with a binder to form workpieces of various desired shapes before coating with cemented carbide, or the adhesion must be cleaned before welding, otherwise, it will not be able to coat, if not before welding the wire-cut residue of small particles can not be removed cleanly will seriously affect the quality of welding, the traditional cleaning method is to soak the tool directly with acid liquid, which can corrode the tool to some extent, but the disadvantage is that it can only clean the oil on the surface of the tool, which is not very useful for the dirt in the micro-hole after wire cutting If the use of ultrasonic cleaning method will thoroughly solve the residual problems after wire cutting, but must be with the special cleaning agent to achieve better results.
The principle of ultrasonic cleaning cemented carbide: according to the characteristics of the dirt distribution on the surface of cemented carbide and the dirt inside the hole, it requires that the ultrasonic wave has sufficient penetration force, and can quickly enter the small hole for cleaning, and by the ultrasonic bombardment down from the wall of the dirt must be real-time flow out of the hole, to avoid repeated contamination of dirt. In the frequency design of the carbide ultrasonic cleaning machine, the ultrasonic cleaning machine through many experiments can ensure that in the same liquid environment, the design of the ultrasonic frequency meets this requirement. Because the higher the frequency of the ultrasonic wave, the more the number of cavitation bubbles, the higher the bombardment density. However, with the increase of the frequency, the impact force of the tiny cavitation bubbles on the cemented carbide becomes weaker, and the cavitation intensity becomes smaller, therefore, the cleaning force is smaller, so we must choose the correct ultrasonic frequency, not only to ensure the size and number of cavitation bubbles but also to meet the intensity of cavitation, so that the liquid in the ultrasonic tank can not only fill into the hole, also can gestate the sufficient energy, achieves the good clean effect.
Advantages of ultrasonic cleaning of cemented carbide:
1. Cemented carbide cleaning must be able to directly into the deep hole, the cemented carbide surface, and the inner hole can be deep cleaned, and technical force greatly improved.
2. Carbide cleaning must be set with ultrasonic density uniformity, the ultrasonic effect is better.
3. The auxiliary heating function can double the dissolvable power to the dirt.
Four. The cemented carbide cleaning liquid is used to dry the cemented carbide when it is taken out at a high temperature.
Cleaning procedures and methods:
1, carbide ultrasonic cleaning machine for the deep hole and parts of the air can be sucked out, cleaning fluid can easily enter the deep hole, cleaning capacity greatly improved.
2. The effect of the ultrasonic wave is better when the gas in the cleaning liquid is removed.
3, the cleaning fluid can be heated to the ignition point above, and the dissolvability of the dirt doubled.
4, in the cleaning use high-temperature liquid to clean parts to provide equal heat after drying.
5. In a vacuum, the boiling point of the solution decreases and the evaporation rate increases. Because of the rapid formation of a high vacuum, the solvent covering the object evaporates in one stroke.
Points to note:
Due to the characteristics of the dirt in the pores of cemented carbide, there are certain requirements for the cleaning solution used: the cleaning solution should provide a certain degree of alkalinity, have a dispersion suspension effect, and can prevent the oil from re-adsorption in the product, the alkalinity used is generally better with PH9 ~ 10, and the cleaning solution should have a strong ability to dissolve the dirt. The decontamination ability of the cleaning solution is closely related to the temperature. If the temperature of the cleaning solution is too low, it will reduce the chemical activity of the solution, and at the same time, the solution rate of the dirt is too low, which is not conducive to the cleaning of the dirt in the pores, will change significantly in favor of cleaning. However, at too high a temperature, some of the components in the solution are decomposed by heat and lose their effect. When the cleaning temperature is higher than the cloud point of the non-ionic Surfactant, the Surfactant solubility in water decreases, and the precipitate rise to the surface, rendering it incapable of degreasing. At the same time, too high a temperature, will make the solvent too much evaporation, but also affect the dissolution rate of sewage.