Optimization Of Wear-resistant Bionic Surface Topography And Inversion Of Cutting Parameters

The complex profile of automobile panel molds is mainly complete d by high-speed milling.The surface quality after milling determines the service performance and service life of the mold.At present,the research on the surface quality after high-speed milling is mostly focused on adjusting the processing parameters to obtain a machined surface with low roughness and high finish.There are few studies on the influence of surface topography on surface friction and wear properties.Previous studies have shown that certain biological surface morphologies have good wear resistance and drag reduction effects.If the bionic non-smooth surface of the part can be prepared directly by milling,it will prolong the service life of the part while reducing the production cost of the part and increasing production.Efficiency has a significant role and important meaning.Therefore,based on the bionic surface wear resistance mechanism and the high-speed milling surface topography formation mechanism,this paper analyzes the influence of processing parameters on the surface topography m icrounits by using a ball-end milling cutter for high-speed milling of Cr12 Mo V die steel.The specific surface topography micro-unit reverses the reasonable processing parameters.The main research contents are as follows:First,by summarizing the common characteristics of the non-smooth surface of the biological body with good wear resistance and drag reduction characteristics,the wear resistance mechanism is analyzed.The morphological characteristics of the machined surface after high-speed milling are analyzed and compared with the common characteristics of the non-smooth biological surface morphology with wear resistance characteristics to demonstrate the feasibility of bionics for high-speed milling surface morphology.Secondly,analyze the line spacing residue and feed residue of the highspeed milling surface,and get the formation mechanism of the high-speed milling surface topography.Establish the coordinate system of the machine tool,tool,and workpiece,establish the coordinates of any point on the cutting edge of the ball-end milling cutter in a static state according to the geometry,and establish the processing plane and convexity of the ball-end milling cutter with processing parameters according to the kinematics principle.The motion trajectory equation of any point on the cutting edge of curved and concave curved surfaces provides the theoretical basis for surface topography simulation.Using Z-Map method to obtain high-speed milling surface topography simulation point cloud data,using NURBS surface reconstruction method to fit the point cloud data to a free-form surface,and compiling a simulation program to realize the surface topography simulation and visualization expression through Matlab software.Then,design the Cr12 Mo V hardened die steel milling experiment,verify the accuracy of the surface topography simulation model by designing different processing parameters,and analyze the influence of the processing parameters on the surface topography micro-unit shape and surface roughness.Through friction and wear experiments,the wear resistance of different bionic surface morphologies is analyzed and the surface wear rate under the same experimental conditions is obtained.Finally,the surface topography is classified according to the different shapes of the surface topography micro-units,and the surface topography micro-unit size parameters are used as constraints to establish the objective function of the surface wear rate and surface roughness and optimize it by genetic algorithm.Taking the optimized surface topography model as the target,its cutting parameters are inverted with the help of the surface topography simulation model.In this paper,the surface morphology characteristics of the organism with wear resistance in nature are taken as the research object,and the surface morphology after high-speed milling of Cr12 Mo V hardened die steel with a ball end mill is used for morphological bionics,and a surface with better wear resistance is obtained.And perform the inversion of cutting parameters.The research results have a certain guiding role in the structural optimization,parameter design and reasonable selection of cutting parameters to improve the wear resistance of the mold surface in the mold processing industry.