Thermal Effects of Fluid on Nanometric Cutting of Silicon

Abstract

To understand the effect of fluid on thermal behavior of material removing in nanoscale, molecular dynamics (MD) simulation method is performed to model the chip generation, heat distribution, phase transformation and the temperature dependence by considering the effects of fluid during nanometric cutting of mono-crystalline silicon. In this work, a fluid containing model was used by considering fluids like coolants and concentrating on its impact during machining. The simulation results show that the chip size is 8% larger in vacuum than in the fluid containing model at the same simulation stage. In both case, the heat distribution topology is unanimous and roughly presents a concentric shape, a steep temperature gradient is observed in tool and the highest temperature lies in chip, but the average temperature is decreased of 6% in the low temperature ranges and 15% in chips of the fluid containing model. Phase transformation mainly occurred in chip, shear zone and machined surface, the growth of phase transformation is retarded by a volume decrease of 9% in the fluid containing model. Some physical quantities are decreased with the increasing system temperature during machining and show thermal soft effect.