Research On Tool Wear And Tool Life Of High Speed Dry Hobbing

With the further blossom of modern industry,consciousness of pro-environment is unceasingly enhanced,and "green and efficient" has become the theme of the progress of modern industry.In order to satisfy the demand of clean processing craft,the exploitation of energy-efficient green equipment and advanced applicable clean cutting technology,high-speed dry cutting craft in the field of cutting processing has become the major research orientation.As one of the most common basic transmission parts,high-end gear manufacturing has become the most critical basic link in the development of China's traditional manufacturing industry,advanced equipment fabricating industry,automotive transmission fabrication industry and other industries.Gear cutting is the most widely used in gear hobbing.The proposal of high speed dry cutting hobbing conforms to the development trend of "green and high efficiency" and has become an important development direction of cutting in gear research.But the higher cutting speed and the situation of missing coolant put greater demands on the cutting properties of high-speed dry cutting hobs.Therefore,in order to realize high speed dry cutting hob,really need to tool wear in the process of gear hobbing features in-depth and meticulous research,analyses the load characteristics of the hob and chip deformation law of the influence of tool wear process,to further improve the service life of the cutting tool and cutting efficiency.In view of the above problems,wear characteristics and tool life of high speed dry grinding are analyzed.Firstly,based on the hobbing cutting principle,the hobbing cutting motion process is analyzed and a numerical model of the relational motion relationship between the hob and the machined gear is established.UG software was used to establish the precise geometric model of hobbing gear motion parameterized,and the variation rule of cutting area is analyzed,which provided a model base for further finite element simulation studies.Secondly,the finite element simulation module was optimized,and based on the accurate parametric geometric modules for different cutting positions obtained above,the cutting forces and chip deformation of the cutter teeth at different cutting positions were obtained by Deform-3D finite element analysis software,and comparative analysis was performed to explore the load on the cutter teeth and the frictional behavior of the chips on the cutter teeth during the cutting process.Thirdly,the material traits and structural traits of high speed dry hobbing are researched.According to the processing technology of high speed dry hobbing in actual production,the wear forms of high speed dry cutting hob at different positions are studied and analyzed.Meanwhile,the wear mechanism under different wear conditions is deeply discussed and analyzed.Finally,the hob life factors are discussed and analyzed,the tool life computational approach is proposed,and its life prediction model is established based on Taylor's formula;the cutting parameter optimization model is established based on the multi-objective genetic algorithm to optimize the high-speed dry hobbing parameters,which provides some theoretical guidance for the selection of cutting parameters for high-speed dry hobbing process.