Today, cutting fluid is usually no longer necessary to have a coating is an important reason. Them to cushion the impact of temperature by suppressing the blade from the cutting zone (tool) heat transfer. Role as a layer of thermal barrier coatings, because it has thermal conductivity than the material of the tool and the workpiece substrate much lower.

Therefore, the heat absorbed by the tool less able to withstand high cutting temperatures. Whether turning or milling, coated tools allow a more efficient cutting parameters without reducing tool life.

Coating thickness between 2 to 18m, it plays an important role in the performance of the tool. Thinner than the thickness of the coating of the coating during impact cutting, is subjected to temperature changes better performance, because less stress thinner coating, easy to crack. When rapid cooling and heating, thick glass coating as extremely fast heating and cooling as easy to break anymore. Dry-cutting blade with a thin coating can increase tool life by up to 40%, which is the physical coating used to coat the circular blades and milling cutter slices reasons. pvd coating often than chemical coating applied to thin, and the profile combined with a little bit more solid. In addition, pvd coating may be deposited at much lower temperatures in the alloy, therefore, they are more used very sharp edge and a large positive rake angle milling, turning.