Multiscale Analysis of Cutting Force During Nano-Scale Vibration Assisted Machining

By means of the molecular dynamics simulation (MD), this paper explores the evolution characteristics of the cutting force during the nano-scale vibration assisted machining (NVAM) process of monocrystalline copper, and conductes a wavelet transform based multiscale analysis on the cutting force. The resluts indicate that both of the principal cutting force and the thrust force involve deterministic trend components (DTC) with periodic and nonlinear characteristics, and additionally coupled with a class of disordered fluctuation components (DFC) with high frequency. Statistical method is employed to assess the DFC, and the DFC of cutting force can be well described by a power-law distribution. The intrinsic dependence of the cutting force evolution on the varying of lattice structure inside the workpiece material has been clearly revealed.