Research On Dynamic Characteristics Of High Precision Centerless Lathe

With the rapid development of the manufacturing industry,the demand for silver and bright materials such as round steel and wire rods is huge in the industries of bearings,aerospace,electronics and machinery.However,in the process of rolling,drawing,extrusion,etc.,the round steel may have surface cracks,folding and other defects,and the scale will often appear after the bar is placed,which greatly affects the surface quality of the bar and is difficult to achieve.Industry needs,so the surface of the bar needs to be treated.The centerless lathe is ideal for removing long-circle metals such as tubes,rods,and discs from surface oxides and cracks,producing non-defective surfaces with high dimensional accuracy and surface roughness and concentric bright round materials.In the machining of the centerless lathe,the vibration of the spindle system and the angular displacement of the clamping device of the center and rear guide system will affect the machining accuracy.Therefore,in this study,the dynamic modeling and dynamic analysis of the green machine that can surface the bar without the heart lathe is carried out.The specific work is as follows:(1)Based on the full investigation of the machine tool dynamics,the paper is drawn by Solidworks software.The three-dimensional model of the centerless lathe machine lays the foundation for the analysis and research of the spindle system and the mid-post system.(2)Dynamic modeling of the key component of the centerless lathe,the spindle system,and the differential equations and state equations of the system.Based on the rotational speed of the spindleless spindle,the feed rate of the bar and the clearance ofthe bearing as the control parameters,the multi-parameter simulation was carried out in Simulink software,and the vibration data of the system when the process parameters of the spindle system were changed were obtained.The influence of each process parameter on the machining accuracy of the centerless lathe is obtained.Through the obtained data and the defined cutting stability,the parameter combination of improving the machining precision and the machining stability can be obtained.(3)Dynamic modeling of the main component of the centerless lathe,the middle and rear guidance system,the differential equation of the system,the dynamic analysis of the clamping device,by changing the disc spring force and the bar feed speed The middle and rear guide clamping device is analyzed by the angular deflection caused by the vibration,and the optimal disc spring force and the bar feed speed are obtained,and the parameter combination for improving the machining precision and the machining stability can be obtained.(4)Using the centerless lathe test bench to carry out the experiment,compare the experimental results obtained by the unintentional lathe with the analysis results of the dynamic model established in this paper,determine the accuracy of the model establishment,and provide the machining accuracy and processing stability for the centerless lathe.A strong theoretical support.In theory,this paper analyzes the overall dynamics of the unintentional lathe,and lays a theoretical foundation for the development and design of high-precision centerless lathes.From the industrial application,the demand for unintentional lathes is extremely high.The research and development of high-precision centerless lathes can not only solve the surface treatment process of silver bright bar,improve the processing quality and processing efficiency,but also have greater environmental significance.