Research On Milling Performance Of Micro Textured Ball End Milling Cutter In Milling Titanium Alloy Curved Surface

Titanium alloys have excellent overall performance,possessing many properties such as corrosion resistance,resistance to extreme temperatures,non-magnetism,weldability,high specific strength,and high adaptability to living organisms,and are widely used in the medical field.However,titanium alloys have low thermal conductivity,generate high temperatures during cutting,increase tool wear,and are resistant to deformation,which leads to slow efficiency in preparing titanium alloys and limits their application.In recent years,the research on micro-weaving of tools,which is derived from the bionic idea,has been carried out,and the tools with microweaving on the tool surface have better cutting performance.In this paper,we established a mathematical model of micro-weaving distribution of ball milling cutters,studied the influence of tool inclination and micro-weaving parameters on milling force and surface roughness when milling curved surfaces with microweaving ball milling cutters,and optimized the parameters of micro-weaving ball milling cutters.Firstly,through theoretical analysis and mathematical calculation,the relationship between cutting parameters and line distance and tool inclination angle of the ball end mill when milling curved surfaces is obtained;the tool-work contact area of the ball end mill during milling is analyzed,and then the mathematical model of micro-weaving distribution is established;in order to simplify the micro-weaving design process of the ball end mill,the micro-weaving design system of the ball end mill is established,which realizes the function of micro-weaving design by means of inputting parameters.Secondly,the three-dimensional model of the micro-loom ball end mill and the workpiece were established,and the milling simulation was carried out by using ABAQUS software,and through the analysis of the simulation results,it was found that the tool inclination was the main factor affecting the milling force and the microloom diameter was the main factor affecting the milling temperature.The effect of tool inclination and micro-loom parameters on the milling force and surface roughness of the workpiece is revealed,i.e.,tool inclination is the main factor affecting the milling force and micro-loom diameter is the main factor affecting the surface roughness,and the accuracy of the experimental results is verified by combining simulation and experiment.Finally,the exponential regression method,stepwise regression method and LASSO method were used to regress the pretreated test data,and through comparison,the stepwise regression method was finally selected to establish the regression equation,and then the cutting performance evaluation equation was obtained;based on this evaluation equation,the parameters were optimized by using the artificial fish swarm algorithm,and the optimized parameters of the micro-loom ball-ended milling cutter were: tool inclination angle 25°,micro-loom diameter 70μm,micro-loom spacing 125 μm and distance from the edge 90 μm.