Macro-mesoscopic Simulation In The Process Of Machining Stainless Steel

Stainless steel material because of its good mechanical properties, good corrosionresistance, be easy to machine, stamp and weld, beautiful appearance and othercharacteristics, widely used in aerospace, military industry, buildings, vehicles, consumerproducts and other industries, plays an irreplaceable role in the production and life ofpeople. Stainless steels are considered difficult to machine. The properties of stainlesssteels often lead to high cutting forces and high cutting temperature, fast tool wear rates,high susceptibility to notch wear, difficulties with chip break-ability, BUE formation andpoor surface finish. In the process of cutting, because of the high cutting temperature andhigh strain rate, the internal microstructure of the chip and the workpiece changedsignificantly. It is a great influence to the formation of the workpiece and the chip.However, it is not easy to obtain the microstructure during the cutting process byusing the experiment generally. In order to research the influence of microstructure tocutting force in the process of machining stainless steel, this paper introduced the formingmethod of visualization based on cellular automaton to simulate the microstructureevolution in the process of machining metal.This paper firstly gets the true stress-true strain curve of304stainless steel underdifferent stain rate and different deformation temperatures through thermal simulationexperiment,obtains the parameters required to establish a mesoscopic organization basedon the analysis of stress-strain curves; secondly, sets up the original metal microstructurebased on cellular automation; then, establishs the model of dynamic recrystallization andstatic recrystallization based on cellular automation for the hot deformation behavior of304stainless steel,the true stress-true strain curves by thermal simulation experiment werecompared with the model established, verify the reliability of the models; then, sets up thefinite element model of cutting304stainless steel, simulates the effect of different cuttingparameters on cutting force, the temperature of the workpiece, strain, stain rate in theprocess of machining stainless steel, extracts the parameters needed in themacro-mesoscopic simulation; finally, simulates the macro-mesoscopic behavior ofcutting based on cellular automation model established.