| With the continuous development of manufacturing industry,flexibility,automation and intelligence have gradually become the development trends.Precision micro-machines are increasingly used in the manufacturing industry because of their many advantages such as small size,light weight,saving material,convenient transportation and storage.In the fields of national defense science and technology,aerospace,biomedicine,and electronic communications,it has been widely used.Therefore,the micro-machining mechanism has gradually become a research hotspot in recent years.In this paper,the cutting mechanism of micro-milling machining,which is different from that of conventional milling,is studied.The micro-milling cutting thickness,cutting force,cutting heat and chip shape are analyzed by the finite element simulation experiments and the micro-scale cutting theory.The detailed research contents are as follows:(1)The theoretical description and analysis of the unique cutting mechanism of micro-milling machining are presented.The influences of the minimum cutting thickness on the cutting force and the cutting shape during the cutting process are introduced.The mathematical model of the instantaneous cutting thickness in milling machining is studied.(2)The finite element simulation technology which is used in this paper is introduced.The establishment of the key technology material constitutive model in the simulation,the choice of the model of the blade friction and the meshing technology are explained.(3)The minimum cutting thicknesses of different materials at different cutting edge radii are determined by the cutting simulation experiments.The effects of cutting thickness on cutting force,cutting heat and chip morphology in the 2D cutting or 3D milling processes are studied.Combined with simulation experiment and milling experiment,the cutting technology was optimized. |
