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The milling experiments of C/SiC composite with PCD tools are conducted, and surface formation mechanism is analyzed by observing surface/subsurface damages. The effect of milling parameters on surface topography and surface roughness is discussed with the analysis of cutting force. The results show that C/SiC composite is removed in the mechanism of brittle fracture. Laminated fracture, pull-out and fracture in bundle of carbon fiber can be observed on the machined surface. The effect of milling parameters on surface roughness is basically the same with that on surface topography. The higher cutting speed can improve the surface quality, the bigger axial depth of cut will worsen the surface quality and the feed per tooth has no significant influence on surface quality. [ABSTRACT FROM AUTHOR]

High-strength carbon fiber reinforced polymer (CFRP) with unidirectional laminate structure has gradually developed into major materials in load-bearing aerospace components, and relevant demand in cutting and machining is increasing. Owing to significant anisotropy, CFRP materials with unidirectional laminate structure incline to produce defects and are typical difficult-to-machine materials. By orthogonal cutting experiments, cutting force, specific energy, cutting temperature and machined surface are obtained when cutting T700 high-strength CFRP unidirectional laminates under different fiber orientations. Based on experimental results, mechanical and thermal anisotropy of CFRP uniform laminates are discussed, specific energy maps under different cutting parameters are achieved, heat sources are studied, and the conduction model is established. By scanning electron microscope (SEM) topography of typical surfaces, surface formation mechanism under different fiber orientations is given. [ABSTRACT FROM AUTHOR]

High-strength carbon fiber reinforced polymer (CFRP) with unidirectional laminate structure has gradually developed into major material in load-bearing components in aerospace, and the cutting demand of CFRP is increasing. Because of the significant anisotropy, CFRP laminates highly tend to produce defects and are typical difficult-to-machine materials. Orthogonal cutting experiments on T800 high-strength CFRP unidirectional laminates are conducted to study the variation of cutting force, torque and cutting temperature with different fiber orientations. Based on the drilling experiments with brad point drill and multifacet drill, the effects of cutting force, torque and cutting temperature on defect forming process are discussed, and SEM topography of hole wall surface with typical defects is given. Through analyzing the wall surface of drilling holes, defect formation mechanism under different drilling processes is given. [ABSTRACT FROM AUTHOR]