Study On Process And Properties Of Preparation Of Magnetic Abrasive By Bonding Method

With the rapid development of machinery,aviation,medical and other fields,the precision requirements of parts made of various materials such as alloys and ceramics are becoming higher and higher in all walks of life.Especially for the precision requirements of ceramic materials,it is still an urgent solution.The problem is the use of high-tech magnetic particle grinding process for grinding.Magnetic abrasive grains are the core grinding tools for magnetic particle grinding.The performance of the grinding particles directly affects the grinding quality.Therefore,it is important to prepare magnetic abrasive grains with excellent performance.In this paper,the development and characteristics of magnetic abrasive grinding technology and the development status of magnetic abrasive are described,and several preparation methods of magnetic abrasive are briefly introduced.According to the mechanism of magnetic abrasive grinding,the main reasons affecting the performance of magnetic abrasive grinding are analyzed,and the failure modes of magnetic abrasive grinding are summarized.Through the analysis of the preparation process of magnetic abrasive grains,it is known that the factors affecting the performance of magnetic abrasive grains are the selection and ratio of binder,the ratio of mixture,the ratio of raw materials,and the particle size ratio.The main influencing factors are the binder selection and ratio,the binder with good bonding performance and heat resistance can prepare magnetic abrasive grains with high bonding strength and good hardness,which can ensure the effective grinding of magnetic particles and observe.By scanning electron microscopy,the microscopic morphology of the magnetic abrasive particles was analyzed for the uniformity of bonding between the particles and the binder.Through the experimental analysis of the control variables of various factors,magnetic abrasive grains with excellent performance parameters were prepared.The performance of magnetic abrasive grains prepared by three different methods and processes was compared and tested.The vibrating sample magnetometer was used to detect the magnetic permeability of different magnetic abrasive grains,and the grinding pressure received in the magnetic field was analyzed from the mechanical point of view.The grinding performance of the magnetic abrasive grains was investigated by grinding the comparison between the magnetic conductive member and the ceramic member.The surface roughness value of the workpiece before and after grinding was measured by surface roughness meter.The surface micro-morphology of the workpiece before and after grinding was observed by 3Dultra-depth microscope.According to the analysis of the grinding results,the magnetic permeability and coercive force of the Fe-diamond magnetic abrasive grains prepared by the bonding method are kept in an equilibrium state,and the grinding pressure during the processing is moderate and stable.The magnetic abrasive particles bonded with epoxy resin,organosilicon resin and polyamide resin at the ratio of4:1:5 have high bonding strength and high temperature resistance.Under the double pressure of impact force and cutting heat,the abrasive phase is not easy to fall off from the matrix and the binder is not easy to soften.At the same time,the high-hardness diamond grinding phase can successfully complete the processing of the super-hard ceramic workpiece by the bonding method,ensuring the processing efficiency and the grinding quality of the workpiece surface,and becomes a new type of magnetic abrasive grain for solving the difficult technical problem of ceramic processing.