Investigation of Surface Properties in Milling of SiC Particle Reinforced Aluminium Matrix Composites (AMCs)

摘要

AMCs offer a high potential for lightweight applications, but represent difficult-to-machine materials especially regarding the increased tool wear and imperfections on the generated surface. Based on a fractional factorial design using CVD diamond tipped tools, the influence of the cutting parameters (cutting speed, feed per tooth) on the surface structure (roughness, imperfections) and the residual stress state is investigated. Increasing the cutting speed up to 200 m/min enables a reduced void formation and strongly compressive residual stresses, whereas a further increase results in scaling effects. Moreover, a feed per tooth of up to 0.015 mm benefits compressive residual stresses, but leads to higher surface roughness values. As the feed is further increased void formation occurs involving a reduction of the compressive residual stresses.