| Magnetic honing technology is a new technology for grinding the inner wall of long and straight stainless steel tubes by using magnetic force-driven rotor abrasives.Early experimental studies show that the technology can remove the oxide skin on the inner surface of non-magnetic stainless steel tubes with inner diameter greater than 68 mm efficiently and cleanly,and reduce the inner surface from the rough surface to below Ra0.5 micron.Stainless steel pipes are widely used in various industries,decoration industries and food processing industries.The inner surface quality of stainless steel pipes has a great influence on the wear resistance,matching quality,fatigue strength,corrosion resistance,flow resistance,cleaning condition and sanitary conditions of stainless steel pipes.At present,the main research task of magnetic honing technology is to further improve the surface quality of stainless steel pipe by magnetic honing,and expand the processing range of magnetic honing technology.This is of great significance to the further application of magnetic honing technology.According to the different excitation sources,magnetic honing system can be divided into electromagnetic stator type and permanent magnet type.Compared with electromagnetic magnetic honing system,the magnetic honing system using permanent magnet magnetic field generator has less calorific value and can be processed stably for a long time.The radial position of the excitation pole can be adjusted within a certain range to meet the processing requirements of different pipe diameters and different surface quality.Based on permanent magnet magnetic honing system,the following aspects are studied in this paper:(1)By using Ansoft Maxwell electromagnetic finite element analysis software,two-dimensional magnetic field transient analysis of the starting and working state of permanent magnet magnetic honing system with different honing tools is carried out,and the magnetic field distribution,force and moment of the tool during the starting and stabilizing process of the system are obtained.The starting and working characteristics of different tools in permanent magnet magnetic honing system were compared.The corresponding parameters of permanent magnet magnetic honing system and electromagnetic magnetic honing system were compared and analyzed under the same tool.(2)Based on the design principle of permanent magnet magnetic circuit,the magnetic circuit structure characteristics of permanent magnet magnetic honing system are analyzed,the method of adjusting the magnetic field of the system by changing the magnetoresistance and air gap length is put forward,and the corresponding optimization scheme is given.On this basis,the parameters of honing stone are optimized from the technological point of view to further improve the processing quality.(3)In order to meet the requirement of a manufacturer in Shanghai that the processing roughness of the inner wall of small-diameter stainless steel tubes is less than 0.1 ?m,based on the previous research,the magnetic circuit adjustment theory of permanent magnet magnetic honing system is used to upgrade the rotating magnetic field generator,and a new type of rotor abrasive tool for magnetic honing of 19 ~ 30 mm stainless steel tube with inner diameter is developed.(4)The process test of permanent magnet magnetic honing system was carried out.The magnetic honing experiments of stainless steel tubes with different honing tools were carried out.The processing experiment of magnetic honing system for small-diameter stainless steel tube was carried out,and the optimum technological route of the workpiece from blank to roughness less than 0.1 ?m was explored.The experimental results show that the magnetic honing system for small-diameter stainless steel tube and its matching tools developed in this paper can effectively remove the oxide scale on the inner wall of smalldiameter workpiece,and reduce the roughness of the inner wall of workpiece from 3.3928?m to 0.0897 ?m. |
PDF Full Text Request