Study On The Magnetic Passivation Mechanism Of Magnetoelastic Abrasive Particle

Tool preparation can improve the microdefects of the cutting edge,extend the life of tool and improve the quality of the machining surface.The magneto-elastic abrasive magnetic tool preparation method has the advantages of low elastic modulus of abrasive,strong magnetic properties of abrasive and high preparation quality.And the magneto-elastic abrasive magnetic tool preparation is an advanced tool preparation method.So it is of great scientific significance and practical significance to study tool preparation.Firstly,around the magneto-elastic abrasive magnetic preparation method,the composition of magneto-elastic abrasive,the principle of dual-disk magnetic preparation and the characteristics of processing of magneto-elastic abrasive dual-disk magnetic preparation are analyzed and the effects of magneto-elastic abrasive deformation,rotation and energy conversion on the material removal mechanism of magneto-elastic abrasive dual-disk magnetic preparation are studied.Secondly,based on the magnetic field theory,a dual-disk magnetic field mathematical model and a dual-disk magnetic field simulation model based on Maxwell are established.The influence of disk diameter,disk thickness,magnetization direction and disk spacing parameters on magnetic induction intensity is studied through the single-factor experiment of dual-disk magnetic field while verifying the correctness of the magnetic field mathematical model and simulation model.Then,based on Visual Studio,the EDEM software is secondary developed to establish the magnetic field force model of magnetic preparation.A method for calibrating the wear coefficient of Archard is proposed to carry out simulation analysis of the magneto-elastic abrasive dual-disk magnetic preparation for studying the effects of abrasive particle size,abrasive magnetic susceptibility and disk spacing on the motion state of magneto-elastic abrasive system,magneto-elastic abrasive speed,number of collisions on the cutting edge surface,magneto-elastic abrasive rotation speed,preparation pressure and accumulated energy of the cutting edge.Finally,an improved edge shape factor characterization method is proposed to reconstruct the edge profile for the edge shape factor characterization method that is difficult to characterize the removal amount of cutting edge material,and the orthogonal experiment of the magnetoelastic abrasive double-disk magnetic preparation is carried out for studying the influence of parameters such as abrasive particle size,abrasive grain magnetic susceptibility and disk spacing on the removal amount of tool material,cutting edge profile and tool surface roughness.By comparing with the simulation results of the magneto-elastic abrasive dualdisk magnetic preparation,the correctness of the magneto-elastic abrasive dual-disk magnetic preparation model and the feasibility of improved edge shape factor characterization method are verified,revealing the mechanism of the magneto-elastic abrasive double-disk magnetic preparation.