Research On Single-Crystal Material Machining Mechanism In Micro-Nano Scale

As quantum mechanics,mesoscopic physics,statistical physics and other modern science develop increasingly and the improvement of advanced technologies such as computer,mankind has entered a age of nanotechnology.And as one of the nanotechnology,nano machining technology is basis that can manufacture devices within the scope of the nanoscale,and it has become an important sign to weigh the development of nanotechnology.Nano cutting technology has broad application prospects,not only nano precision processing,but also it’s an important mean of nano precision complex surface processing,and it plays a supporting role in the development of the advanced manufacturing industry.It is an urgent need for the development of advanced manufacturing in the future to establish a complete and mature theory of nano cutting basic theory and to develop high efficiency and low damage controllable nano cutting technology.This paper summarizes the research status at home and abroad and the main achievements in this field,from the nano cutting mechanism of nano cutting model and cutting limit and typical nano material cutting theory and key technology,under the basic principle and algorithm of molecular dynamics,by setting the cutting tool material to the rigid body,we choose the integration method of classic Newton’s equations of motion,the accurate description of the potential energy function and the ensemble that can simulate the real environment,the single crystal nickel nano cutting model is established to simulate the machining process,and use the visualization software to deal with the simulation results,the transient atomic diagrams of nano machining process and related characteristics are also obtained.The main content of the article is divided into the following two aspects:The first part is to study the influence of cutting depths in cutting process.In this section,we studied the effect of different cutting depths on the chips in the processes,analyzed the defect evolution and the formation process of machined surface from the view of the crystal structure deformation;Then there are also separate relevant interpretations about cutting force,cutting energy,and the percentage changes of FCC and HCP in chips.The second part is the cutting tool rounded corners’ effects in the processing.First,the minimum cutting thickness model is established,and simulate the machining processes of different rounded corners and observe the chips heights and transient figure in the processes,and analyze the relationship between rounded corners and minimum cutting depths;Then,the machining transients and subsurface stratum are studied when cutting depth is minimum cutting depth;Finally,the influence on deformation coefficient of chips and subsurface stratum damage are also studied.On the basis of the analysis results,the paper draws the main conclusions,and puts forward suggestions for the future research.