Structure Optimization And Dynamics Analysis Of Magneto Rheological Vibration Attenuation Boring Spindle

With the rapid development of modern industry,the demand for the level of processing and machining precision in various parts is becoming more and more strict,at the same time,the demand for parts appearance is getting increasing complex,which contains the requirements for hole parts,especially the processing of the deep hole and the matched shaft parts.Boring is one of the important processing methods of hole machining parts,but the boring bar is easy to be vibrated,which will not only affect the machining precision of work pieces,accelerates the wastage of the cutter but also increases the processing cost.Currently,the majority of the domestic mainstream boring bars for hole machining parts are imported from abroad, which has in part hindered the development of manufacturing industry in our country.Therefore, the paper is to study a kind of magneto rheological damping boring bar based on MRF filling medium, providing the theoretical basis of the processing of boring class processing.In this paper, the boring bar based on the Tibetan damping will replace the damping liquid with the new type of MRF damping liquid,adding vibration sensor in the part of the cutting.Based with the sensor signal real-time conversion magnetic field,the electric control part of the boring bar can change the stiffness and damping,to reduce the vibration amplitude of the rod body as far as possible. On the basis of existing damping boring bar and according to the principle of magnetic related saturation we make a choice of manufacturing materials in the parts of vibration damping boring bar,calculate and optimize the key parts of the boring bar size limit.Using the data obtained from the optimized and in recent years the study of the SD oscillator,we establish a magneto rheological-damping-boring-bar double degree freedom-nonlinear model and write a-boring-bar-vibration nonlinear-differential equation, using average method to solve it.By using virtual prototype technology,we can make a secondary design of damping boring bar,and according to the optimization of the structure size, we can make a ADAMS rigidflexible coupling model and analyze the action of the boring bar in the linear and nonlinear force of vibration.Then,compared with the average method, the results are consistent.To analyze different rigidity and damping on the vibration of the rod body,we try to use ADAMS/View of boring bar vibration simulation, limit the constraint conditions, in order to get the optimal damper and the optimal stiffness of the boring bar in the design condition.The MATLAB software can generate stochastic excitation signal of boring bar vibration,then compare the boring bar under the random excitation signal and sine excitation response,which provides certain reference for the research on the vibration of the boring bar.