| Magnetorheological Finishing(MRF),mainly used in the field of optical micro-nano processing,is a noval and flexible polishing technology.Compared with traditional polishing methods,MRF can get nano-scale surface roughness with high material removal rate and good polishing effect.Therefore,MRF is paid extensive attention by the academic and engineering.As for MRF devices,movement parameters and process parameters have a larger impact on the polishing effect.Common MRF devices have wheeled,inclined axis,cluster-type and so on.For the noval reciprocating MRF device with combined movement characteristics,the influence of the motion parameters and technological parameters on the polishing effect have been systematically studied in this paper.The main aspect of the research is as following:(1)The components and properties of the MRFFs are analyzed and the preparation process is given in the paper.The MRFFs is prepared and tested its rheological mechanical property.(2)For the problem of trajectory coincidence caused by periodic coupling,accoding to the hypothesises based on the limit cases that particles are completely fixed or free-flowing under the micro-scale,the mathematical model is established.The trajectory simulation is carried out based on MATLAB.The effect of particle movement trajectories on the surface texture is obtained under the macroscopic phenomenon.(3)Magetic field simulation is carried out based on ANSYS.Comparing the magnetic flux density distribution in the MRFFs and air medium,focus on the analysis of the zone where the polishing effect can be achieved;Based on the simulation data,a general mathematical moel of the magnetic flux density distribution in the polishing area is fitted.(4)Accoding to the orthogonal experiments designed,study the influence and significance of several parameters on the surface roughness Ra and peak removal rate MRR.The best combination of process parameters is determined and the experiment is carried out to validate it.Through the foregoing research work,it is found that the reciprocating MRF device can achieve the basic purpose of effective material removal.However,when the motion parameters are determined,it should be paid much attention to the value of the velocity parameter to avoid the surface scratches due to periodic coupling;In addition,the factors affecting the surface quality of the polished workpiece by the analysis of the range of the orthogonal test difference are as follows:magnetic flux density,workpiece rotating speed,volume ratio of polishing abrasives,polishing gap.The result has certain practical significance for determining the technical parameters of MRF in engineering. |
