Numerical Simulation And Parameter Optimization Of Tapping Process For 316L Stainless Steel

As a common tool for machining internal thread,the poor tapping conditions and the structural characteristics of the tool itself lead to the low cutting efficiency and poor chip removal of the tap,and even the failure of the tool such as edge breakage and fracture.With the increasing use rate of new hard to process materials,internal thread tapping has become a manufacturing problem.Standard tap processing hard to process materials is more prone to rapid wear and sudden failure,resulting in serious economic losses in the production process.In view of the variety and mechanical properties of different processed materials,the reasonable selection of tap geometry and cutting parameters can effectively improve cutting efficiency.Therefore,it is of great significance to design special tap parameters for different workpiece material characteristics.In this paper,the machining of 316L stainless steel straight slot taps is taken as the research object.The geometric modeling of taps is carried out by using Pro/E software,and the numerical simulation of tapping process is carried out based on Advant Edge FEM software.In order to reduce the performance index?axial force,torque,temperature?of tapping process,improve the ability of tool rolling chip and wear resistance,and prolong the life of tap,this study optimizes the parameters from the angle of tool?front angle,back angle,tap angle?and process parameters?speed,cutting fluid,tap coating?respectively.Through scientific test methods and analysis means,the optimal parameter combination can be obtained to improve tap tapping performance and provide research basis for the optimization of tool structure and process parameters.The main research contents and achievements of this paper are as follows:?1?Tap geometry modeling.Based on the analysis of the structural characteristics of straight slot taps,a general three-dimensional model of straight slot taps is established with the help of Pro/E software.By modifying the geometric parameters?front angle,back angle and tap angle?of taps,the tool modeling is carried out to provide the tool model support for the optimization simulation test of the geometric parameters of taps.?2?The construction of tapping simulation model.According to the characteristics of tap tapping process,a numerical simulation model of straight slot tap tapping process based on Advant Edge FEM software is established.In order to verify the reliability of the tapping simulation,the M8 universal straight slot tap was used to carry out the tapping test and the tapping process simulation.The simulation result is the same as the torque change trend and chip shape measured in the test,which verifies the reliability of the simulation model.?3?Study on the optimization of the geometric parameters of tap.In order to improve the performance index of tapping and the ability of tool curling,from the point of view of optimizing the structure of standard taps,the single factor experiment and orthogonal design were used to optimize the geometric parameters of taps.Through the analysis of test data,the influence rule of each geometric parameter on tapping performance index is obtained.Meanwhile,the optimum combination of geometric parameters for machining 316L stainless steel straight slot tap is determined by grey Taguchi analysis method,which is front angle 13°,back angle 9°,and taper angle 10°.Through the comparative test,it is verified that the tapping performance of the improved tap is excellent and benign,so as to achieve the special design goal of tap structure.?4?Research on Optimization of tap process parameters.In order to improve the tapping performance of 316L stainless steel straight slot taps,a single factor test was carried out for each process parameter?spindle speed,tap coating,cutting fluid?by using numerical simulation method from the perspective of optimizing tap technology.Through the analysis of single factor test,the influence rule of each technological parameter on tapping performance index is obtained.In addition,on the basis of single factor test analysis,the coating and spindle speed of taps are selected as the main process optimization objects to carry out two factor tapping simulation test.By entropy weight method,the best combination of process parameters was determined as Al₂O₃tap coating and rotating speed of 200r/min.The results show that the machinability of 316L stainless steel can be improved by optimizing the tap geometry and process parameters.