Cubic boron nitride (CBN) and polycrystalline cubic boron nitride (PCBN) cutting tools have been widely used in turning hard materials. But there are still many workshops, because their price is too high to use. The use of a new cryogenic cooling technology, can not use expensive tool for high-speed hard machining, and prolong the service life of the cutter.

The icefly type cooling system development USA air products company, in hard car, -320 ~ F liquid nitrogen, through a spray to the knife head. The working principle is based on injection of liquid nitrogen, to the cutter head, can rapidly reduce the high cutting cutting temperature produced,reduce the softening effect of the cutter head due to high temperature, improve the blade hardness and cutting performance. In addition, it has the most important significance is the processing in low temperature cooling, can better protect the integrity of the cutting edge, prevent the damage of the cutting edge of machining parts damage. At the same time, the machined surface is compressivestress state, improve the surface quality of machined parts and reduce the surface roughness.