Influence of spatial engagement angles on machining forces and surface roughness in turning of unidirectional CFRP

Carbon fibre-reinforced polymer (CFRP) is being widely used due to its low specific weight and outstanding mechanical properties. However, using identical machining parameters on unidirectional CFRP can lead to different results depending on the fibre orientation.

Recently, a process-independent model describing the engagement conditions in oblique cutting of unidirectional CFRP has been developed, introducing the spatial angles ${\theta }_0$ and ${\phi }_0$. Since the engagement conditions of milling and drilling are complex, analogy experiments are conducted in turning with variation of the setting ${\kappa }_r$and inclination angles ${\lambda }_s$. In this study, process forces and surface roughness were measured as a function of the complete range of fibre cutting angle $\theta$.