Research On The Design Of Comb-shaped Micro-grooves On The Rake Face Of Coated Carbide Blades

With the rapid development of science and technology,hard-to-cut materials are widely used due to their excellent properties.However,the machinability of difficult-to-cut materials not only greatly limits the scope of its application,but also puts forward higher requirements on the cutting performance and service life of the tool.According to the theory of tribology and the temperature field micro-groove design method,on the basic of the 40 CrMnMo and TC4 material cutting tool with a single micro-groove feature designed by Guizhou University(hereinafter referred to as the micro-groove turning tool),the micro-groove micro-texture composite design research is carried out by DEFORM 3D simulation software in order to develop tools with better cooling effect.The main contents of this paper are as follows:(1)Between the micro-grooves and the cutting edge of the 40 CrMnMo micro-groove turning tool,three micro-textures of stripe type,corrugated type and comb-teeth type are designed.The influence of micro-texture shape size on cutting temperature is simulated and analyzed.It is indicated that the micro-texture parameters have a significant effect on the cutting temperature,and all three micro-textures significantly reduce the cutting temperature of the rake face.(2)Taking the maximum temperature reduction amplitude of the tool face as the goal,the cutting rake face micro groove and three kinds of micro-texture composite structures of the40 CrMnMo material are optimized.It is found that the micro-groove comb-shaped micro-texture composite design has the best cooling effect.Then checking its strength and finding that it meets the strength requirements of the tool;(3)The cutting performances of 40 CrMnMo cutting tool,micro-groove turning tool and three kinds of micro-groove micro-texture composite turning tool,such as cutting force and residual stress on workpiece surface,are compared and analyzed by simulation software.Compared with the original turning tool,the stripe micro-texture has little effect on improving the cutting force,while the corrugated and comb-teeth micro-texture can effectively reduce the main cutting force of the tool,and all three micro-textures can effectively improve the residual compressive stress on the surface of the machined workpiece;compared with the micro-groove turning tool,the corrugated and comb-shaped micro-textures can effectively reduce the main cutting force,reduce the generation of cutting heat,and increase the maximum residual compressive stress value of the processed workpiece surface.(4)To the design of cutting micro-groove micro-textured composite cutting tool for40 CrMnMo material based on,micro-texture design of the area near the cutting edge of the rake face of the TC4 micro-groove turning tool are carried out,and the corrugated micro-texture is designed;the influence of corrugated micro-texture parameters on the cutting temperature is simulated and analyzed by simulation software.To the maximum temperature decreasing amplitude for the goal,the micro-groove and corrugated micro-texture composite features are optimized.Further,the selected micro-groove corrugated micro-textured composite tool is checked for strength to meet the strength requirements of the tool.The cutting performances of TC4 cutting tool,micro-groove turning tool and micro-groove micro-texture composite turning tool,such as cutting force and residual stress on workpiece surface,are compared and simulation analyzed.It is found that micro-groove micro-texture composite design can effectively reduce the cutting force and increase the residual compressive stress on workpiece surface;(5)The micro-groove micro-textured composite turning tool with the optimized cutting TC4 titanium alloy material is prepared.Through the single-factor experimental design,the influence of the cutting parameter on the cutting force and the surface roughness is studied.It is found that within the range of the determined cutting parameters,the designed micro-groove micro-texture can effectively improve the cutting force and surface roughness of the cutting tool;through the statistical analysis of the data,the influence of the cutting parameter on the friction coefficient is studied.It is found that the influence of cutting parameters on the friction coefficient is not significant.By comparing and analyzing the friction force,it is found that the micro-texture can improve the friction of the rake face of the tool and reduce the cutting force.The prediction model of cutting force and surface roughness is established by orthogonal test,and it is found that the established prediction model has high reliability.