Abstract
Turning tests, using two kinds of single crystal diamond tools, were conducted to provide the possibility of ductile regime turning of glass-like carbon material, suitable for precision parts. In the case of a truncated shape tool, which has little contact area with workpiece, ductile regime turning is possible. As the feed rate decreases, a transition mode, where the planar surface-layer area is removed, appears instead of ductile regime material removal. In the case of R shaped tool, which has large contact area, ductile regime turning is hard to recognize because the machined surface directly changes from elastic to brittle fracture as the depth of cut increase. The brittle fracture starting depth of the R shaped tool is around 1 μm, and the brittle fracture starts at 0.5 μm depth of cut as the feed rate decreases.
