Carbon fiber reinforced polymer (CFRP) has been widely used in aerospace field because of its excellent material performance. Because of its heterogeneity

anisotropy and high temperature-sensitivity

machining defects is prone to occur. In this work

 the milling experiments of T800/X850 carbon fiber composite laminates

 which are commonly used in aviation industry

were carried out to investigate the feasibility of supercritical carbon dioxide based cryogenic cooling method in CFRP composites machining. The results show that cryogenic environment can significantly reduce the cutting temperature and improve the surface quality compared with dry environment. Meanwhile

the bending moment of cutting process under cryogenic environment is higher than that under dry environment. The combination of high cutting speed

low feed rate and cryogenic environment is helpful to improve the machining quality and efficiency of CFRP composite.