Milling Property of Aramid Fiber Composite under Cryogenic Temperature Condition

In order to improve milling quality of aramid fiber composite, the milling of the composite at cryogenic temperature were carried out with liquid nitrogen as cooling fluid, and then the main milling force, machined surface micro-morphology and surface roughness under the conditions of normal temperature and cryogenic temperature were studied and compared; the effect of cryogenic temperature milling on the machined surface quality of the composite was also analyzed. The results show that when milling the aramid fiber composite at normal and cryogenic temperatures, the main milling force both decreased with the increase of the spindle speed, and that at cryogenic temperature was lower with the same spindle speed. The surface roughness of the specimen after milling at cryogenic temperature decreased with the increase of the spindle speed, which was lower than that after milling at normal temperature, indicating the better quality of the machined surface. Milling at cryogenic temperature can effectively prevent the fluff and erosion deflects, decrease the tensile and bending rupture of the fiber, and improve the processing properties of the aramid fiber composite.