Research On Dynamic Characteristics Of Working Space Of Composite Boring Milling Machining Center

In recent years,the processing center of our country is developingwith the high,fine,sharp direction.The dynamic characteristics of the research on the traditional low speed machine tool is not significant.Now with the machining center spindle speed more and more quickly as well as the accuracy of the workpiece machining is required.The influence of dynamic characteristics on the machining accuracy has not been ignored.Dynamic characteristics include the vibration mode and amplitude,they are the main factors that affect the accuracy of precision machining.when machining center in its work space is processing work,tool position with the process is continuous changed.The change of the position of the cutter in the working space makes the structural stiffness and mass distribution of the machining center.The dynamic characteristic parameters of the machining center are changed.In this paper,the change of dynamic characteristics and the influence of vibration on machining accuracy of machining center are also given.Under consider the influence of the fixed and movable combination on the dynamic characteristics of the whole machine.Calculation of dynamic characteristic parameters of typical machining position.Using the interpolation method to fit.Summed up the characteristics of dynamic spectrum.Analysis of processing stability regionto provide the theoretical basis for selecting reasonable working space and the working frequency of the motor.The main research contents and conclusions are as follows:1)By establishing a dynamic model of the composite boring and milling machining center of the movable fixed joint surface.According to the Hertz contact theory,the ball screw axial contact stiffness of the machining center is derived.Theoretical method for the contact stiffness of linear roller guide.At the same time,through the finite element analysis software for the composite boring and milling machining center of the movable joint surface is calculated.Simulation the results are verified by theoretical results.Theresults show that the method can quickly and accurately identify the stiffness characteristics of the joint surface.2)Through the modeling of machining center,the finite element model is established.The whole machine isanalyzedby the finite element method,distinguish fromdynamic characteristics of the machine parameters.By the method of experiment,the mode parameters of the center of the boring and milling machining center of the boring and milling machining center are extracted.Comparison of modal parameters and finite element simulation results.The validity of the finite element model is verified.3)To the boring spindle feed,boring and milling spindle slide position,feed and milling parameters for slide position.The working spacediscreteTX-1600 G complex boring and milling machining center.Mode simulate typical operating position of boring and milling system.Based on modal analysis,harmonic response analysis is carried out.The handle in the construction of boring and milling force under the action of dynamic spectrum.The spectral characteristics of the modal frequency spectra and the vibration characteristics of the various modes are summarized.The machining stability of boring and milling machining center is summarized.