STUDY OF ULTRAPRECISION ORTHOGONAL MICRODIAMOND CUTTING OF SINGLE-CRYSTAL COPPER

The results of experimental study of ultraprecision orthogonal microdi amond cutting of single-crystal copper are presented. The orthogonal c utting tests were carried-out on an ultraprecision fly-cutting machine at various nominal depths of cut from 3.0 mum down to 0.01 mum (10 nm ). The machinability in microcutting and the influence of crystal orie ntation on the microcutting process are discussed from the standpoints of chip formation, cutting force and surface integrity. It is confirm ed that continuous chips are formed under all cutting conditions exami ned. The magnitude of the cutting force and the shear angle are substa ntially influenced by the crystal orientation at depths of cut of 1 mu m or more, while they are not notably influenced with depths of cut be low 1 mum.