| With the development of society,the requirement of manufacturing industry is getting higher and higher.The development of modern numerical control machine tool technology is the most important part of manufacturing industry.The trend of modern CNC machine tools is equipped with high-speed motorized spindle,so the research on high-speed motorized spindle is extremely important.In this paper,the vibration of the high-speed motorized spindle will be studied.The vibration of the high-speed motorized spindle affects the safety of the spindle and the reliability of the machining accuracy of the workpiece.The research on the vibration of the motorized spindle begins with the resonance frequency of the motorized spindle,because the motorized spindle reaches the critical speed corresponding to the resonant frequency,the resonance will occur,which is extremely unfavorable.Then verify whether the stiffness of the motorized spindle meets the requirements,the vibration mode and displacement of the motorized spindle when running,and the displacement response of the motorized spindle when machining.In order to study the resonance frequency,the transfer matrix method is first used to establish the dynamic model,and then the dynamic model is established,and then the motorized spindle is solved by using the search method of matlab.The resonance frequency of the high-speed motorized spindle and the vibration mode under the resonance frequency are obtained.Then the finite element method is used to solve the critical speed.Firstly,the simplification of the finite element model and the calculation and analysis of the boundary conditions,such as the stiffness of the bearing,are carried out.Finally,the resonance frequency,the critical speed,is calculated by using the finite element software Dyrobes.Solve the critical speed of the size and vibration mode.Comparing the results of the two modeling methods and analyzing the errors of the two methods provide more research methods for the future research on the calculation of resonance frequency of motorized spindle.The static analysis module of ansys workbench is used to analyze and solve the stiffness of motorized spindle.The cutting force,support stiffness and other boundary conditions are calculated according to the machining conditions,and the boundary conditions are inputted.The solution verifies whether the rigidity of high-speed motorized spindle is reasonable and whether it can meet the requirement of machining.For the analysis of the no-load rotation of the motorized spindle,the steady-state response vibration analysis is carried out by using Dyrobes,and the displacement range of the motorized spindle vibration is solved.The transient analysis module of the finite element software ansys workbench is used to analyze the transient vibration of the motorized spindle.The vibration modes and amplitudes of the motorized spindle are calculated by integrating the matlab into a curve,and the vibration of the motorized spindle is observed when it is in operation.Finally,in view of the vibration of the motorized spindle,the harmonic response analysis module of ansys workbench is used to solve the vibration response of the motorized spindle and observe the displacement of each part of the motorized spindle.And finally find the relatively fragile position of the spindle.After the simulation analysis,the use of experimental equipment for verification and analysis,the use of acceleration vibration sensor and infrared laser displacement sensor installed on the spindle data acquisition,collected the size of the resonance frequency and the displacement of the spindle cutter position.The data acquisition results are compared with the simulation results to verify the rationality of the simulation results,and to analyze the causes of errors. |
