Research On Frictional Behaviour By Finite Element Simulation Of Dry Turning Hardened Steel

To meet the growing needs of the global environmental requirements and sustainable development strategies, people began to focus on a green cutting technology- "Dry Cutting Technology". Green dry cutting technology mainly concentrate without use of cutting fluid, so as to eliminate cutting fluid pollution, to achieve clean production. Currently the main application in the field of mechanical processing is Dry Hard Cutting Processing Technology of "Cutting Instead of Grinding". It is a typical representative of dry turning high hardness materials by PCBN cutting tool. Our current researches in PCBN cutting high hardness materials focus on the research of cutting force, cutting temperature, tool wear and the integrity of the machined surface(machined surface hardness, residual stress, surface roughness, etc.). But there is less mechanism explanation by variation law of friction characteristics in the process of Dry Hard Cutting, especially less research of the influence of the cutting elements(such as cutting force, cutting temperature and tool wear, etc.) In cutting process, friction can lead to redistribution of temperature, physical stress and strain in the chip, the tool and the work-piece. Since the mutual coupling between these physical quantity make thermo-plasticity deformation and Adherence Effect in work-piece, and it would be a huge influence in cutting force and cutting temperature. At the same time, the tool- chip cutting temperature generated by friction will directly affect the wear and durability of tool, and the machining accuracy and surface quality of work-piece.This experimental is based on PCBN cutting tool Dry Turning Cr12 Mo V(hardened steel), and through a series of Advant Edge FEM and DEFORM-3D dry hard cutting process analysis, to take chips – knife the coefficient of friction of the contact surface as the objective of study. Researched different chips – knife friction coefficient on the influence and mechanism of cutting force and cutting temperature; Researched the different hardened state(different parts hardness) of the work-piece on the influence of chips- knife cutting force of the contact surface and cutting temperature, as well as on the prediction of tool wear,and researched the mechanism of tool wear by the variation law of friction coefficient. The main contents of this paper include the following:(1)Through simulating PCBN tool cut Cr12 Mo V work-pieces in different friction coefficient based on DEFORM-3D which is a finite element simulation software,researched different friction coefficient in chips – knife contact surface on the influence and mechanism of cutting force and cutting temperature.(2)Through simulating PCBN tool cut Cr12 Mo V work-pieces in different hardness based on Advant Edge FEM which is a finite element simulation software,researched the different work-pieces hardness on the influence of chips-knife cutting force of the contact surface and cutting temperature, as well as on the prediction of tool wear. Combining the result analysis of imitational experiment and then guidance of theory, analyzed work-pieces hardness on mechanism of action of friction coefficient in chips – knife contact surface, and researched the variation law of cutting force, cutting temperature and tool wear by the variation law of friction coefficient.(3)Through analyzing the influence and mechanism of cutting force and cutting temperature in different hardness of work-piece by turning experiments. And compared with Advant Edge FEM simulation data and validated the real reliability of simulation data.