A SIMPLIFIED MODEL FOR ORTHOGONAL MICROMACHINING OF FCC SINGLE-CRYSTAL MATERIALS

摘要

A simplified model for orthogonal micro-machining of face-centered cubic (FCC) single-crystal materials is derived in this work. The model uses the basic assumptions and geometrical construction of Merchant's model. Bishop and Hill's micro-plasticity model is used to determine the plastic work done to shear the material along a thin shear plane. The rotation of lattice during deformation is not considered while calculating the plastic work. The total power was then determined by the sum of the shearing power and friction power. A minimization of this power within the range of geometrically allowable shear angles enabled determination of shear angle and cutting forces. The model was then compared with data from the literature. The overall trend of the model was seen to match well with that of experimental data.