Study On The Edge Stability Of Turning Tool For Large Pitch Screw

As a key component in large-scale equipment,large-pitch screw parts transmit power and motion displacement for mechanical equipment,and occupy an important position in enterprise production equipment.The vibration generated by the large pitch screw during the turning process seriously affects the wear of the tool,which reduces the stability of the cutting edge and affects the surface quality of the thread.How to reduce the vibration during the cutting process and improve the cutting edge stability will become the primary task of turning large pitch screws.In this paper,the large-pitch screw forming tool for turning is taken as the research object,the tool vibration trajectory model under different cutting parameters is obtained,and the simulation analysis method under vibration is proposed.The cutting parameters and tool structure parameters are optimized.First,the experiment of turning large pitch thread workpieces is carried out to obtain the worn tools and analyze the main wear patterns that affect the stability of the tool edge.The main wear mechanism of the tool is obtained by EDS analysis,which is abrasive wear and bond wear.The friction model of the tool rake face is established,the friction test is designed,the friction coefficient variation law under different loads and speeds is obtained,and the influencing factors affecting the friction coefficient change are analyzed.Secondly,through the analysis of the factors affecting the stability of the cutting edge,it is determined that the cutting parameters and tool structure parameters are the main factors affecting the stability of the cutting edge.The tool vibration signal is obtained by cutting experiment,the ideal motion trajectory equation of turning large pitch screw cutter is established,and the vibration displacement equation of the tool is connected in parallel to obtain the trajectory model under the action of tool vibration.Combined with the motion trajectory of the tool under vibration,the DEFORM cutting simulation software is used to carry out the finite element simulation study on the turning large thread.The influence of different cutting parameters on the cutting performance is analyzed,and the accuracy of the simulation is verified by experiments.Thirdly,the orthogonal simulation experiment under vibration is carried out.The multi-objective optimization models of cutting force,cutting temperature and tool wear of blunt round edge and chamfered edges are established respectively.The parameters of cutting parameters and tool structure parameters are optimized based on genetic algorithm,and the optimal cutting parameters and tool structure parameters are determined.Finally,the tool edge stability experiment including the optimal results is performed by comparing the cutting force,cutting vibration and tool wear under different parameters.The effectiveness of the optimization results is determined,and the difference between the left and right edge cutting is analyzed.The cutting edge stability can be maintained during the cutting of the right edge.Reasonable arrangement should be made when designing the cutting process.