The cutting fluid is a type of metalworking fluid used in various metal cutting processes such as broaching, milling, turning, drilling, and the like. The cutting fluid is divided into two categories: pure oil type cutting oil and water based cutting fluid. The water-based cutting fluid is further divided into an emulsified oil, a semi-synthetic liquid, and a total synthetic liquid. Water-based cutting fluids are generally concentrated liquids that require dilution with water to a specified concentration. Maintaining a suitable concentration when using water-based cutting fluids is an important maintenance measure.
1. Why should we check the concentration of cutting fluid:
The cutting fluid is the "blood" of the machine tool and flows continuously in the circulation system. Just as blood tests can detect abnormalities in the human body, abnormalities can be detected by detecting the cutting fluid. One of the important indicators is the concentration of the cutting fluid.
2. What is the effect of the concentration of metal cutting fluid?
1. Hazard of too low cutting fluid concentration: The concentration of cutting fluid is too low, which may lead to a series of adverse consequences: metal rust or metal corrosion, increased tool wear, affecting the quality of metal processing, cutting fluid breeding bacteria, stinky, stinking, Problems such as shortened service life of cutting fluid.
2. Hazard of excessive cutting fluid concentration: If the concentration of the cutting fluid is too high, not only the concentrate will be wasted, but also some adverse consequences, including increased foam, cooling fluid and cleaning ability of the cutting fluid, and impurities in the cutting fluid. Increased content, causing skin irritation to the operator, irritating the upper respiratory tract and eyes, causing non-ferrous metal corrosion, spots and other problems.
3. How to detect the concentration of cutting fluid:
After the cutting fluid is put into use, it is best to check the concentration every day. If the concentration of the cutting fluid is abnormal, it should be adjusted in time. Generally, the concentration is reduced. It is necessary to add the concentrated liquid. When supplementing, the required concentrated liquid should be accurately calculated. It is worth noting that when the cutting fluid breeds a large amount of bacteria, the concentration of the cutting fluid is lowered, and when the emulsified oil is broken, the concentration of the cutting fluid is also lowered. Sometimes the concentration is too high, usually because the water evaporates or mixes with other oils. When the concentration is too high, do not add water directly to the machine.
The refractometer is often used to detect the concentration of the cutting fluid. The advantages of the refractometer are that it is portable, simple to use, low in price, and can be measured at any time when needed. Almost all water-based cutting fluids are suitable. In use, it is only necessary to drop the cut onto the prism, read the refractive index, and then use the measured refractive index against the standard curve, or multiply the refractive index of the product to obtain the concentration.
The refractometer also has its drawbacks. First, the refractometer passes the refractive index of the cutting fluid as a whole to determine an approximate concentration, so the concentration and variation of the components of the cutting fluid cannot be accurately determined. In addition, if other oils or contaminants are mixed into the cutting fluid, the refractometer cannot measure the components contained in the cutting fluid, and the measured concentration may be inaccurate.
If the measurement of the refractometer is limited, accurate analysis and measurement of the cutting fluid, understanding of the chemical composition of the cutting fluid, and guiding the correct maintenance method can be performed accurately by the oil testing laboratory using a special instrument.
