Experimental Research On Milling Force And Surface Quality Of Milling 300M Steel

300M Ultra-high Strength Steel(40CrNi2Si2MoVA),as a steel for aircraft landing gear,with the characteristics of high strength,high hardness and low thermal conductivity.It is a typical difficult-to-process material in aeronautical manufacturing field.Its machinability is poor and the cutting force and cutting heat have a great influence on the surface quality of the parts.Therefore,it is necessary to accurately predict the effect of cutting parameters on the cutting force,cutting heat and machined surface quality to improve the machining efficiency of 300 M steel.This paper has carried on the related research mainly from the following aspects:At First,the parameters of the ring end mill used in the test were expressed by the tool parameters.The cutting conditions of the ring end milling cutter under different milling modes is analyzed.Then,the 300 M steel milling test platform is set up,the orthogonal test method is used to study the 300 M steel milling experiment and the influence law of each cutting parameter on the cutting force is analyzed.The empirical model of cutting force in the milling process of 300 M steel is established,and the significance test of the milling force model and the coefficient of the model are carried out to verify the accuracy of the empirical model.What's more,the finite element modeling of 300 M steel milling process is carried out by using AdvantEdge software.The validity of the finite element model is verified by comparing with the experimental data.The influence of cutting parameters on cutting temperature in the milling process of 300 M steel is analyzed by two-dimensional milling simulation using single-factor test method and orthogonal test method.Finally,the surface quality of the machined surface of 300 M steel is studied.The effects of milling parameters on the surface roughness are analyzed.The microhardness and surface microstructure of the machined surface are preliminary discussed in combination with the cutting force and cutting temperature.