Classification of cutting fluid
The main component  is an aqueous solution of the water cooling performance of the liquid, to facilitate the operator to observe the processing Shihai.

2) emulsion mainly consisting of 95% to 98% of water, mineral oil, emulsifying ointment dilution is made with good flowability and cooling, which also has a lower lubricity. The emulsions of oil and water to combine the advantages of both, along with good lubricating and cooling properties, so for the high-speed low-pressure high-temperature metal cutting have better results. In addition to cutting difficult materials processing, the emulsion can also be used for all light and medium-heavy machining load, and most of the processing, the emulsion can also be used in addition to all the grinding of complex grinding away. However, the disadvantage of the emulsion is also very prominent, it is easy to make bacteria when exposed to air, so that the emulsion of corruption, deterioration, so in general should join the less toxic organic fungicide. Wherein the high concentration emulsion for roughing and grinding. Low concentration emulsion for finishing, drilling, and milling.
3) cutting oils are mainly mineral oil, animal and vegetable oils or with only a small number of complex oil and additives in actual use to improve its lubricating and anti-corrosion properties. Its excellent lubricating properties, but the cooling performance is poor. Mainly used for gear machining, milling reaming, cutting processing.

Effect of cutting fluid
1 lubrication cutting fluid energy between the workpiece surface and the tool, a slight gap between the chip and tool in a thin film reduces the friction and improve the quality of the workpiece.
Cooling cutting fluid 2 can take a large amount of cutting heat cutting area, the cutting temperature decrease, thus effectively reducing tool wear. Cooling capacity is good or bad, depending on the thermal conductivity, specific heat, heat of vaporization flow velocity and the like. Commonly used cutting fluid cooling effect of the aqueous solution is best. Cutting oil somewhat less.
3 cleaning effect cutting fluid cleaning action is to adhere to the machine tool, fixtures, fine chips on the tool and abrasive powder cleared to reduce tool wear. To prevent scratching the surface machining and machine tool guide, cleaning performance is good or bad, depending on oil cutting fluid, flow and pressure.
4 rust rust preventing effect of cutting fluid is to protect the workpiece, the machine tool is not affected by the surrounding medium and corrosion. Anti-rust strength, depending on their role in cutting fluid composition and additives. Stronger than water, such as oil rust prevention, anti-rust agent added can effectively improve the ability of anti-rust.