Study On The Performance Of Turning Ti6Al4V Alloy With Concave-Convex Composite Texture Tool

In the process of cutting,there are serious workpiece adhesion and tool wear between tool and chip,which are faced with a series of manufacturing problems such as short tool life and low machining quality.For this reason,researchers put forward the surface micro-texture technology to slow down the tool wear and improve the tool life.For example,titanium alloy materials,which are widely used in aerospace,shipping,chemical production and other industries,are easy to adhere to the tool surface because of their low thermal conductivity and deformation coefficient.The reason is,on the one hand,due to the material characteristics of the workpiece,it is not easy to meet the requirements of precision and surface quality;on the other hand,the chip sticks to the knife during processing,which forms an unstable chip tumor,which affects the machining accuracy and ultimately leads to the reduction of processing efficiency,quality and stability.In recent years,the theoretical research and engineering application of surface micro-texture show that texture can significantly improve lubrication and reduce friction.Therefore,in this study,combined with DEFORM simulation software to simulate the actual cutting conditions,the cutting performance of texture tools is evaluated,and compared with the actual cutting experiments,the comparison of single texture and non-texture cutting force,cutting temperature,chip shape and surface wear is analyzed,and then the texture is combined together to explore the excellent cutting performance of composite texture tools.The main research contents and conclusions of this paper are as follows.（1）Finite element simulation of single texture.After Solid Works modeling,it is saved as STL format and imported into DEFORM simulation software.After pre-processing,the simulation results are as follows:when the area share of rake face texture（Volcano-like texture）changes in the range of 18～28%,the cutting performance is the best under the area share 22%.While the working conditions of v_c=120 m/min,f=0.2 mm/rev,α_p=0.15～0.45 mm and the same area share（22%）,the performance of textured tools is compared with that of grooved texture and pit textured tools.It is found that the wear degree of textured tools is lighter than that of grooved textured tools,followed by grooved textured tools,and the wear degree of pit textured tools is the highest.It can be seen that the wear resistance of textured tools is better than that of pits and grooves.In order to maximize the effect of the combination of textures and reduce the effect of friction and wear,textured tools were mixed and Separated composite（VGM,VGS,VPM,VPS）with grooves and pits respectively,and the effect of the composite was investigated.（2）Experiment of laser texture technology.In order to obtain better composite texture morphology and optimize the laser processing parameters meet the need for concave texture and bulge texture morphology,systematic experimental studies were carried out.The results show that the laser parameters of bulge texturing texture are 150W,pulse width 3000 us,processing times 1,defocus 0;laser parameters of concave texture pits and grooves:power 6 W,scanning speed 1200mm/s,processing times 15;groove texture parameters 6.7 W,scanning speed 600 mm/s,processing times 20 times.（3）Comparative experimental study on machining performance of single texture tool.The experimental platform adopts CA6140 NC lathe,and the machining experimental conditions are the same as DEFORM simulation.The performance comparison experiments of three kinds of single texture and non-texture tools are carried out respectively.The results show that the cutting force of single texture tool is lower,and the cutting force of pit texture tool is the lowest when the working condition is v_c=120 m/min,f=0.2 mm/rev,α_p=0.15～0.45 mm.When α_p=0.3 mm,the cutting temperature of groove texture tool is the lowest,the temperature drop is the most obvious,and the friction coefficient of groove texture tool is close to that of groove texture tool,which is lower than that of textured and untextured tool.In the wear surface analysis,the surface wear of textured tool is lighter,the chip bonding is less,and the chip crimping degree is also less.（4）Comparative experimental study on cutting performance of composite texture tools.The results show that the cutting condition of the composite texture tool is the same as that of the single texture tool,and the cutting performance of the texture tool with dispersed composite texture is the best,that is,the cutting performance of the VPS texture tool is better,the cutting force and cutting temperature are lower than other composite texture tools,the chip surface morphology and crimp radius are better than other composite texture tools,and the bond wear of the rake face of VPS texture tool is lighter.The textured texture promotes the crimping of chips,takes away a lot of cutting heat,reduces the wear of chips on the tool surface,and improves the machining life and quality of tools.Based on these,the single morphology of pit texture can be obtained,and its cutting effect is better.After compounding with the morphology of volcano-like texture,the compound effect can reduce the degree of tool surface wear,improve the cutting performance,promote chip crimping and improve the machining quality.