Research On Directional Polishing With Polishing Tool Remotely Controlled By Magnetic Field

The technology of ultra-precision machining is the key that a country manufactures high-end precision equipment and become a powerful equipment manufacturing country.It is of great significance to the quality of people's lives and the country's development and construction..In many fields,the shape of the parts in mechanical equipment is more and more complex.And the fact that many parts have cavity structure,greatly increasing the difficulty of ultra-precision machining technology.The existing methods of polishing the surface of workpiece cavity have the following difficulties: the cavity diameter is small,and the polishing tool is too large to enter the cavity;the path between the polishing area inside the cavity and the cavity diameter is complex,and it is difficult for the polishing tool to reach the surface of the polishing area;the existing ultra-precision machining technology is difficult to polish and the closed cavity.In view of this situation,this paper designs a method with polishing tool that remotely controlled by magnetic field,to polish the cavity surface of the workpiece.The main research in this paper is as follows:(1)A magnetic field remote-controlled polishing experimental platform was designed to polish the surface of the workpiece's inner cavity by analyzing the current situation of the difficulty in polishing the surface of the workpiece's inner cavity.N52 permanent magnet,kr60-3 mechanical arm and DCX26 L dc motor was selected.Under the action of permanent magnet in the magnetic field,the polishing tool contacts the cavity of the workpiece with a certain pressure and rotates on the surface of the cavity of the workpiece with a certain speed,so as to polish the surface of the cavity of the workpiece.(2)The mathematical model of the spatial magnetic field is established by the magnetic dipole displacement method,and its simplified in this paper.Building a simulation model COMSOL Multiphysics and verify the error of the mathematical model.Analyzing the rule of the magnetic field distribution.And the mode of the polishing tool place relative to the magnetic field remote control permanent magnet is determined.(3)Analyze the deformation of the polishing tool in the polishing process with the COMSOL Multiphysics;Analyzing the magnetic force and magnetic moment of polishing tool in magnetic field;Analyzing the variation of magnetic force and magnetic moment of the polishing tool when the polishing fluid is placed around the permanent magnet.The mathematical model is established to analyze the motion state of the polishing tool during the polishing process,and the condition function that polishing tool steady move is analyzed and verified by experiments.(4)The material removal function model of the workpiece is established using the Preston's empirical equation,and an experimental platform is set up to verify the material removal model.The material removal function curve is draw with the Matlab Analyzing and comparing the material removal of the workpiece.Analyze the surface quality of the workpiece before and after the polishing.