Parameter Optimization Of Meso-geometrical Characteristics Of Cemented Carbide Ball-End Milling Cutter

Titanium alloys have been widely used in aerospace,automobile,metallurgy,shipbuilding,and medical fields due to their high strength and good heat resistance.But titanium alloy is a typical difficult to machine material with low thermal conductivity and high chemical activity.According to the processing characteristics of titanium alloy,In this paper,meso-geometry features(surface micro texture and edge radius)are introduced into the hard alloy ball end milling,to study the influence of meso-geometry features on the cutting performance of ball end milling of titanium alloy,and optimization and experimental verification of the meso-geometry features parameters.Firstly,based on the morphological characteristics of micro texture,the mathematical model of micro pits texture and groove texture is established;based on the oblique cutting model,the cutting force and cutting temperature model of the ball-end milling cutter with the meso-geometry features are established.And the effects of the mesoscopic geometry on the cutting force and cutting temperature were studied by the model.Secondly,the finite element software Deform was used to simulate the milling of titanium alloy with different meso-geometry features.The effects of micro-pit texture,transverse groove texture,longitudinal groove texture,orthogonal groove texture and radius of blunt edge of cutting edge on cutting force,cutting temperature and tool surface stress were analyzed.Thirdly,based on the simulation parameters,orthogonal regression experiments are used to construct the mathematical model of cutting force,cutting temperature and tool surface stress.Using genetic algorithm,the minimum cutting force and cutting temperature as the optimization objectives of ball-end milling meso-geometry features parameters were optimized,the optimal diameter of the crater texture,depth,crater texture of the distance between the distance of the cutting edge distance and rounded cutting edge radius.Finally,the ball-end milling cutter with different meso-geometry features is processed by laser processing equipment;the experimental platform for the milling of titanium alloy with the ball end milling cutter with mesoscopic geometrical characteristics was established.The validity of the cutting force model and the optimization results were verified.