1. The normal pH of the cutting fluid is between 8.4 and 9.8, and the highest value is 9.8.
2. When detecting the cutting fluid, take a small bottle of oil sample from the nozzle port with the sample bottle (you cannot directly sample from the surface of the oil tank to avoid affecting the test results).
Put the test paper into the sample bottle, wait a few seconds to take out the test paper, dry the liquid, and then compare the reference value, which is the test result.
3. PH value is too high: PH value is too high (higher than 9.8), easy to foam, aluminum parts are easy to rust, easy to hurt the skin.
4. The PH value is too low: when the pH value is lower than 8.0, the acid value is too high, and the cutting fluid should be replaced in time because the pH value is too low and the acid value is high, which may cause the machine to rust and the workpiece to rust.
5. Causes of excessive pH:
A. Processed magnesium-containing materials.
B. A highly alkaline cleaner is used.
6. Causes of low pH:
A. The oil slick is not cleaned up in time.
B. The cutting fluid concentration is too low.
7. Water hardness:
The water hardness is too low, the defoaming property is not good, and it is easy to foam; the water hardness is too high and the processed product is unstable.
The hardness of water indicates the content of calcium, magnesium, iron, aluminum, zinc and other ions in water. It is usually calculated by Ca2+ and Mg2+. There are two types of units,
One is expressed in milliequivalents per liter, and one is expressed in degrees. That is, 1 liter of water is equivalent to 1 degree of Ca in 1 liter of water.
0-4 degrees is very soft water, 4-8 degrees is soft water, 8-16 degrees is moderate hard water, and 16-30 degrees is hard water.
8. The concentration of the cutting fluid is a key parameter.