Research On Bearing Performance Analysis And Prediction Method Of Gear Formed By Gear Skiving

Gear skiving has the advantages of high processing accuracy,and combines the characteristics of high efficiency of gear hobbing process and adaptation of gear shaping process to a wide range of gear types,and is widely used in gear roughing and semi-finishing.With the continuous breakthrough of tooth turning machine tools and high-precision tool technology,gear skiving has the potential of gear finishing.Applying the gear skiving to gear finishing can shorten the gear manufacturing process chain and improve the processing efficiency,while reducing the clamping error introduced by multiple gear clamping and improving the machining accuracy.However,due to the feed knife marks on the tooth forming surface,the gear bearing performance is still unclear,which hinders the practical application of gear skiving.In view of this,this thesis establishes a mathematical model of the geometric forming process of gear skiving,completes the solid modeling of the geometric features of the tooth surface knife mark in gear skiving,and analyzes the influence of the tooth processing parameters on the contact stress of the gear tooth surface and the bending stress of the tooth root based on finite element simulation.The main research contents are as follows:Firstly,based on the kinematic principle of gear skiving,the gear processing process is analyzed to obtain the motion relationship between the tool and the workpiece.Based on the geometric design parameters of the cutter,the parameter equations of the end truncated involute tooth profile,helical gear production surface and rake face of the turning tool are derived,and the parameter equation of the cutting edge space curve and the motion trajectory surface of the cutting edge in space are solved,and finally the three-dimensional simplified model of gear skiving forming gear is established.Secondly,a finite element simulation method for the bearing performance of gear skiving forming gear is proposed,a simulation model of gear bearing performance is established,the finite element contact control equation of gear meshing process and the load and constraint conditions of gear meshing process are determined.To verify the accuracy of the simulation analysis,the simulation results are compared with the calculation results,which provides support for studying the bearing performance of gear in tooth forming.Then,the influence of tooth cutter feed and tooth direction modification coefficient on gear bearing performance is analyzed.The influence of various process parameters on gear bearing performance and its distribution and variation characteristics were analyzed by single-factor simulation test,and the influence of tooth tool feed and tooth direction modification coefficient on gear bearing performance was analyzed by two-factor three-level orthogonal simulation test.Finally,though the response surface method,a two-factor and five-level simulation test was designed.The gear cutter feed and the tooth profile modification coefficient were used as design factors,and the surface contact stress and tooth root bending stress were used as response indicators.A predictive model of tooth surface contact stress and root bending stress based on the multiple regression method of the response surface is created,and though simulation experiments,the accuracy of the predictive model is verified.