Research On The Influence Of The Geometry Of The Rake Face Of A Skiving Cutter On Cutting Performance

The gear skiving process is a gear machining method based on the principle of spatial double-degree-of-freedom meshing,offers high processing efficiency,wide gear processing types and low machining costs compared with similar processes.It will be widely used in the future of gear machining.The key to promoting the widespread use of the gear skiving process is to improve the cutting performance of the skiving cutters.The cutting edge is the part of the cutter that is directly involved in the work in gear skiving,and has a crucial effect on the cutting result.The rack face geometries will affect the shape of cutting edge and the removal of chip,which in turn affects the cutting performance.However,academic research on the impact of different rake faces on the cutting performance of gear skiving cutters is extremely sparse,making it difficult to provide guidance for practical production.Therefore,this thesis takes the rake face geometry as the object,and uses finite element simulation methods to obtain the differences in the impact of the rake face geometry on the cutting performance,and analyses the tool design parameters and skiving process parameters on the cutting performance of different rake face geometries,so as to provide methodological support for the subsequent geometric design of the skiving tool.The main research contents are as follows:Firstly,based on the kinematic relationship between the tool and the workpiece,combined with the mathematical principles of the geometrical forming process of the skiving tooth surface,the parameter equations of the production surface of the skiving tool,three different types of rake face are derived successively,and the parameter equations of the cutting edges of different skiving tools are solved in turn by association.The trajectory surfaces formed in the machining of the cutting edges are solved using the flush coordinate transformation method,which is adapted to a simplified workpiece flute model,and a simplified model of the cutter teeth is established by combining the various surfaces of the tool.Secondly,the simulation model of skiving tooth processing is constructed: the intrinsic model of the material is determined based on the simulation analysis process of the skiving tooth process,the fracture criterion in the processing is clarified by comparing the quality of the tooth surface under different parameters,the friction characteristics and the tool-chip contact model are selected to meet the actual processing state of the skiving tooth,and the simulation chip model of the skiving tooth and the chip model in the actual processing are compared with those of other scholars to ensure the accuracy of the simulation model.Again,the simulation results of different skiving tools are extracted and the cutting forces,cutting stresses,temperatures and temperature clouds are compared and analyzed to understand the difference in cutting performance of the rake face geometry on the skiving tool and to obtain the applicable machining occasions for each tool.The workpiece material is then changed and the simulation is carried out again to check whether the conclusions are correct and to give the best rake face geometry for the simulation results.Finally,the design parameters and process parameters of the tools are changed respectively,and several sets of simulation experiments are carried out to understand the significant differences between the cutting performance of different tools affected by the front and rear angles,helix angle,cutting speed and feed amount of the tools using analysis of variance method,and finally the best choice of the front tool configuration of the skiving tools is obtained,which provides reference values for the actual production of the skiving process and the in-depth study of the rake face of the skiving tools.