| Titanium alloy has high specific strength,strong heat resistance and corrosion resistance,which is an essential important metal material in the field of aerospace.It is also widely used in the fields of military engineering,shipping,medical treatment,etc.However,due to its poor thermal conductivity,high temperature chemical activity and low elastic modulus,its machinability is poor,which affects the service life of the blade.In the actual processing process,the cutting performance of the blade can be effectively improved by setting a reasonable groove on the tool front face.In this paper,the titanium alloy TC4 is taken as the research object,based on the finite element simulation,combined with the secondary development technology,from the two aspects of the groove edge parameters and the groove parameters of the front face,the influence on the cutting force is explored.The main research contents are as follows:(1)Three kinds of grooved blades are selected for turning experiment.The influence of three kinds of grooved blades on chip shape is observed under different cutting depth and feed rate conditions,and a better groove is selected as reference groove.The accuracy of cutting force simulation by finite element software is verified by turning experiment,and the difference of simulation results between ABAQUS and AdvantEdge under the same cutting condition is compared.It is found that the simulation results of cutting force and chip shape by using two different software are basically the same.(2)A two-dimensional cutting model is established to study the influence of cutting parameters on cutting force.Based on the secondary development of ABAQUS in Python,a twodimensional cutting simulation plug-in that can quickly change the cutting parameters of the blade is developed.This paper introduces the development process of the script of the plug-in core and the user graphic interface,which provides a digital analysis tool for the study of the influence of the blade edge parameters on the cutting force.(3)The force mechanism of the blade edge is analyzed,and the influence of the length of the edge,the angle of chamfering and the first front angle on the cutting force is analyzed by single factor experiment.Taking the blade parameters as regression parameters,the multi regression model of cutting force is constructed by response surface method.The regression model is optimized by genetic algorithm,and the optimal value of blade parameters is determined.(4)With Visual Studio 2012 as the development environment,NX10.0 is redeveloped by using UG / open API module to realize parametric modeling of complex groove of tool;a threedimensional cutting simulation model is established to analyze the change rule of cutting force caused by anti chip angle and groove width on the front face of the tool,as well as the influence of cutting parameters on chip shape,and an empirical model of cutting force is established.In rough machining,a larger anti chip angle and a smaller groove width will increase the cutting force of the tool.In finish machining,the tool bears a smaller cutting force,which can appropriately increase the anti chip angle and reduce the groove width. |
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