Discrete Element Simulation Analysis Of Magnetic Abrasive Finishing

As a kind of precision and special machining method,magnetic abrasive finishing machining has the advantages of high machining accuracy,good machining control,good composite machining ability,good self-sharpening ability,no tool compensation,and wide application range.At present,it has been widely used in finishing the surface of complex curved surface,spatial bend,plane and inner and outer circle.The research on magnetic abrasive finishing has always focused on the process test or the finite element analysis of the external permanent magnetic field and electromagnetic field,and the understanding of the micromachining mechanism of magnetic abrasive particles in magnetic abrasive finishing is insufficient.In order to further study the mechanism of magnetic particle lapping,the key is to study the effect of magnetic abrasive on the workpiece surface in the process of magnetic particle lapping.Because magnetic abrasive is affected by magnetic force,friction force and centrifugal force in the processing area,its motion is more complex,and it is difficult to analyze its motion characteristics by conventional methods.In recent years,the discrete element method is widely used by scholars at home and abroad to study the motion of granular particles.As an advanced 3D discrete element analysis software,EDEM can simulate the motion process of particle system in real time and analyze the motion characteristics of particles.However,there is no magnetic field in EDEM itself,so it is a technical problem to load the magnetic force on the magnetic abrasive particles in EDEM.In order to solve the above problems,the mathematical model of the magnetic force on the magnetic abrasive particles was established,and the accuracy of the mathematical model of the magnetic force was verified by experiments.The C++programming language was used to compile the mathematical model of magnetic field force.At the same time,the finite element software ANSYS Maxwell was used to simulate the non-uniform magnetic field generated by Nd Fe B permanent magnet pole,and the magnetic field strength data in the magnetic abrasive finishing processing area was derived,and the derived magnetic field strength data was correlated with the magnetic field force in the compilation.The secondary development of magnetic abrasive particle force was completed.Finally,the compiled particle force was loaded into EDEM through the built-in API of EDEM,thus solving the technical problem that EDEM could not load magnetic field force.Using three-dimensional discrete element software EDEM of magnetic abrasive machining process simulation,through the analysis of magnetic abrasive grain in the manufacturing process of position,velocity and grinding grain on the pipe inner surface of grinding pressure,this paper discusses the magnetic abrasive in the processing area is adsorbed by external ndfeb permanent magnet pole movement,single single magnetic abrasive grain on the pipe wall motion process,The effects of workpiece speed and magnetic field intensity on the quality of magnetic abrasive finishing were studied.Using highly camera observed magnetic abrasive movement during the grinding process,analyzes the workpiece speed through the magnetic abrasive machining test,the influence of magnetic field intensity on the processing quality,the test results and simulation results are basically identical,use of EDEM simulation is verified the feasibility of magnetic abrasive machining process,in the magnetic abrasive machining for EDEM laid the foundation of the application of,It is of great significance to promote the further development of magnetic abrasive finishing technology.