Cubic nitrogen changes boron (CBN) nitrogen of He Jujing cubic metre changes boron (PCBN) cutting tool already was applied generally at horniness material turning. But because their price is too high,still have a lot of workshops and reject to choose. Use technology of new microtherm refrigeration cutting, can not use the price already costly cutting tool undertakes high speed good car is machined, and still can prolong cutting tool service life. The system of refrigeration of Icefly low temperature that develops by company of American Air Products, the lieutenant general can be machined in good car - the liquid state nitrogen of 320 ° F carries a spray head direct eject arrives on knife head. The working principle of place basis is, eject can drop the cutting high temperature that cutting area produces quickly to the liquid state nitrogen on knife head, reduce the bate effect that knife head produces because of high temperature, improve the hardness of knife head and performance of cutting tool cutting. In addition, what have important sense more is the integrality that machines can better land to protect cutting blade below microtherm refrigeration, the cutting blade that prevents damaged causes loss to machining a spare parts; Make machine spare parts surface to show at the same time control stress state, the exterior quality that improves treatment spare parts and reduce exterior surface roughness. The auxiliary unit that the microtherm refrigeration system of Air Products company can regard an only system or machine tool as cooling system, undertake transforming to all sorts of machine tools, the Quest that produces like the Hardinge company of new York city fastens train bed. In the oilcan with the medium or sealed container that is the cylinder record that nearing memory of liquid state nitrogen the machine tool commonly, the conduit of liquid state nitrogen with the will flexible connector that has versatile contact through and lathe tool carrier join, carry liquid state nitrogen to knife head through a nozzle. In using, the work out of the program and traditional cooling system are same. According to introducing, this low temperature cooling system uses at machining the part that composite material of hard steel of temper by dipping in water, horniness and pulverous metallurgy material make, have a special advantage more, after because inert liquid state nitrogen is in,be being contacted with these spare partses namely can volatilize very quickly, and won't resemble common and cooling means taking redundant matter in the remnant on the spare parts in that way. This is special the spare parts treatment that the pulverous metallurgy material that is helpful for water of similar and poriferous ooze makes, can save the time that needs to sweep surplus other people seriously normally. CNC Milling