Effect of lubrication and cutting parameters on ultrasonically assisted turning of Inconel 718

The paper further develops the finite element (FE) model of ultrasonically assisted turning (UAT) discussed in Mitrofanov et al. [A.V. Mitrofanov, V.I. Babitsky, V.V. Silberschmidt, Finite element analysis of ultrasonically assisted turning of Inconel 718, J. Mater. Process. Technol., in press]. The advanced FE model (based on the general FE code MSC.MARC) allows transient, coupled thermomechanical simulations of both UAT and conventional turning of elasto-plastic materials. This model is used to study the effect of cutting parameters (such as the cutting speed, depth of cut and feed rate) and influence of lubrication on various features of two turning techniques, including cutting forces and chip shapes. The recently obtained results on three-dimensional FE modelling of UAT are also presented. This 3D model allows a study of chip formation in oblique turning.