To study the effect of cold air on the machining quality of stainless steel 0Cr18Ni9,cutting experiment under cold air was carried out by using the cold nitrogen spray refrigeration device.The experimental results were contrasted with the data obtained under dry cutting and emulsion cutting,which show that,contrasted with dry cutting and emulsion cutting,the cold air cutting technology can remarkably improve the surface integrity,raise the cemented carbide tool life,as well as improve the chip-breaking perf...