Metal cutting fluid is the general name of the oil that provides lubrication, cooling, cleaning, rust prevention and other functions for machining in various metal cutting and grinding processes.
In metal processing, the PH value of the cutting fluid we normally use is usually alkaline, between 8.0-9.5. Whether manufacturers using cutting fluid or enterprises producing cutting fluid, they often test the PH value of cutting fluid. Manufacturers using cutting fluid test the PH value to better use and maintain the service life and effect of cutting fluid; The manufacturer of cutting fluid tests the PH value in order to produce cutting fluid with higher performance.
There are two main methods for daily PH testing: The first is the most traditional test method, that is, use the PH test paper to test the cutting fluid, observe the color change of the PH value sample, and judge its PH value range. The average price of PH test paper is 2 yuan, and there are 100 test papers. Therefore, the cost of using PH test paper to test the PH value of cutting fluid is very low. However, the error of using this test method is large, and it requires years of operator guidance before this method is recommended.
The second test method is to use a refractometer. With the improvement of our scientific and technological level, we can not only use traditional testing methods, but also use tools and hand-held refractometer, which can measure not only the PH value of cutting fluid, but also the concentration of cutting fluid. The market price of refractometer is about 200 yuan, which is very convenient to use. The PH value and concentration of cutting fluid can be accurately read in 2-3s clock.
