| In recent years,in the field of machining,high-efficiency machining has received more and more attention.turning machining has obvious advantages in achieving high-efficiency machining technology,and high-speed machining technology has unique advantages in high-efficiency machining.Success ranked first in the field of machining.However,in the process of high-speed turning,the scientific and complete processing parameter list is very small.Workers can only rely on past experience or carry out a large number of test cuts to select parameter.Because titanium alloys have a good overall performance,but it is a typical hard-to-machine material,so this subject takes the process of machining Ti6Al4 V titanium alloy with WC tool as the research object,and carries out the analysis of the turning performance during the turning process and the parameters optimization.The main research content is as follows:(1)Research on high speed turning theory and material forming and finite element methodThe deformation area and chip formation process in metal turning process are introduced.The distribution of force and temperature in turning process is analyzed.The turning process is analyzed and verified by finite element simulation theory.(2)Finite element analysis of the turning process based on DEFORMThrough the simulation software DEFORM,an orthogonal turning simulation model for machining Ti6Al4 V titanium alloys based on WC tool was established.The chip flow law and tool wear condition were studied and analyzed.The combination of transient and steady state methods was used in the turning process.The stress,strain law and temperature field are studied.Based on the results of finite element simulation analysis,the heat dissipation holes are opened on the blade to reduce the blade turning temperature.The size and number of holes are designed for the blade,and the heat dissipation measures are verified.Verify the effectiveness of cooling measures in reducing blade temperature.(3)Optimization of turning parameters based on genetic algorithmSet the turning volume as the design variable,the maximum metal removal rate,the lowest surface roughness of the part,the minimum turning force and the minimum turning temperature as multi-objective functions,and the machine tool spindle speed,feed amount,turning power,machine tool spindle turning torque,and parts The surface roughness,turning force,and the maximum deflection of the working axis are the mathematical models of the turning process with constraints.The genetic algorithm is used to optimize the established mathematical model,and the population size,termination evolution algebra,crossover probability,and mutation probability are set in the genetic algorithm.The MATLAB toolbox calls the program to optimize the mathematical model parameters.(4)Optimization of tool path of turning processProe software was used to establish a 3D solid model of Ti6Al4 V titanium alloy workpiece.The 3D solid model of the workpiece was imported into the Mastercam software,and the simulation and optimization of the turning path of the tool were realized through the setting of parameters such as the tool. |
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