Maintenance method of the hottest cutting fluid

Maintenance methods of cutting fluid

the maintenance of cutting fluid mainly includes the following items:

1. Ensure the smoothness of the liquid circulation route

timely remove the metal chips, metal powders, mold mucus, decomposition products of cutting fluid itself, and grinding wheel chips in the circulation route, so as to avoid blockage

2. Bacteriostasis

the importance of cutting fluid (especially lotion) in inhibiting growth is well known. Regular injection of fungicides and ultra-fine filtration can be used to inhibit the proliferation of bacteria

3. Purification of cutting fluid

the substances that pollute the cutting fluid are mainly metal powder and fine gravel powder, floating oil and free water, microorganisms and reproductions, especially Mucor fungi

the solid powder contained in the cutting fluid comes from the machined parts and cutting tools. This kind of solid is not only easy to block the pipeline, but also has the following hazards:

(1) particles suspended in the coolant damage the seal of the pump, increase tool wear, damage human skin, and affect the processing quality

(2) the solid precipitates at the bottom of the oil pool and coalesces with organic matter to form a sediment layer with a large number of pores, which provides favorable conditions for microbial reproduction, and the fine filaments of mold stabilize the precipitated solid

(3) the metal powder in the cutting fluid has high chemical activity, which can make some components in the cutting fluid invalid. Bacterial pollution makes the cutting fluid rancid and decomposed, and the reproduction of mold produces viscous substances, which leads to the blockage of pipelines and nozzles

floating oil refers to the oil used in the transmission and hydraulic system of the machine tool that leaks into the cutting fluid system due to the lax sealing of the machine tool. The harm of floating oil is to swell and deform some materials of the cutting fluid system, interfere with the emulsion balance of the emulsion, and make the emulsion lose stability. Moreover, floating oil often floats on the surface of lotion oil, blocking the contact between emulsion and air, resulting in anoxia of emulsion, rapid reproduction of anaerobic bacteria, and accelerating the deterioration of emulsion

after the cutting fluid is polluted by the above three kinds of substances, if the method of removing the pollution is adopted separately, the procedure is very cumbersome. In recent years, ultra-fine filtration method has been developed, which can remove solid, liquid and most fungal pollutants. However, the ultra-fine filtered cutting fluid is limited to microemulsions or synthetic fluids with little oil, and its components will not form micelles or other condensates at low concentrations

maintenance and management of aqueous metal cutting fluid the goal of maintenance and management emulsion is to make its pH value, concentration ratio, bacterial content and other technical indicators within the set range, so as to achieve the purpose of extending the service life. No matter how good the performance of emulsified new energy vehicles is, the demand for copper will increase. If you don't pay attention to daily maintenance and management, you can't maintain its performance for a long time, but will shorten its service life; However, emulsions with ordinary performance can also maintain their performance for a long time if they pay attention to maintenance and management. The maintenance management of emulsion includes daily maintenance and regular maintenance. Daily maintenance requires that the water quality, system cleanliness and system liquid volume should be tested every day. Tap water can be used for liquid preparation, but the hardness is about 150ppm. The maintenance of system cleanliness is very important to the stability of emulsion performance. System cleaning is mainly to remove oil stains, so it must be cleaned every day. Since part of the emulsion will be taken away during the production process, it should be replenished in time every day to keep the total liquid volume of the system unchanged. When replenishing liquid, pay attention to the low position and slow speed of pouring into the liquid tank. In addition, during a long period of suspension (such as weekends and national holidays), the emulsion system still needs to be regularly circulated, stirred, or filled with air, or added with fungicides, supplementary additives, etc., to prevent the massive proliferation of anaerobic bacteria in the emulsion, resulting in the deterioration of the emulsion. Regular maintenance requires regular detection of the pH value, concentration, bacterial content, etc. of the emulsion. If there is any change, take corresponding measures in time in the future. The pH value of the emulsion is generally 9.0, which is alkaline to prevent the corrosion of machine tools and control the growth of bacteria and fungi. The pH value of the emulsion in use will slowly decrease, so the regulator must be added in time. Generally, the common concentration range of emulsion is 5% - 13%. If the concentration is too high, there will be more screw foam when unscrewing the exhaust hole of oil collector, which will cause high cost, stimulate the skin and poor cooling; If the concentration is too low, the rust prevention performance, bacterial inhibition ability and lubricity will become worse. There are many reasons for the decrease of concentration, such as high water hardness, separation of emulsion and grease, bacterial pollution, consumption of emulsifier, instability of cooling liquid in today's rapid economic development in the west, etc. add new liquid and bactericide in time according to the situation. It should be stipulated that the bacterial content should be measured every two weeks. Bacterial reproduction will consume emulsifiers, precipitate oils and emulsions, and reduce the concentration and lubricating performance of emulsions. The oxygen loving bacteria exhale CO2, which makes the pH value of the emulsion decrease. Poor rust prevention performance; Anaerobic bacteria will produce H2S and odor. Although synthetic emulsion is not easy to grow bacteria, it can grow fungi. When the number of bacteria ≥ 105 or the pH value and concentration change greatly, the stock solution or bactericide must be added for adjustment