Study On The Performance Of Magnetic Abrasive By Hot Pressing Sintering

Magnetic abrasive finishing technology has developed dozens of years, has made great progress in the design of the magnetic generator and the preparation of magnetic abrasive, and it has been generally used in machinery、automobile、 aeronautics and astronautics、medical equipment、precision instruments and other fields、Compared with the traditional method, it shows great advantages in the complex free surface、the special-shaped parts、Larger Length to diameter ratio parts. But the making of magnetic abrasive technology still is one of the key factors to restrict magnetic abrasive finishing technology’s development. It is the goal of researchers that how to make magnetic abrasive with stronger cutting ability、higher bonding strength、higher hardnes、stronger wear resistance、longer service life、lower cost.This paper is on the theoretical basis of powder metallurgy principles and hot pressing sintering principle and makes use of vacuum hot pressing sintering furnace preparing SiC/Fe magnetic abrasive, then by homemade experimental apparatus and advanced testing instrument has analyzed the physical performance of the SiC/Fe magnetic abrasive, and has done a lot of magnetic abrasive finishing experiments to explore the performance index of magnetic abrasive, finally obtaining the following conclusions:(1) The density of single magnetic abrasive is influenced by sintering temperature, sintering pressure and heat preservation time. The apparent density of magnetic abrasive increases when the increase of magnetic abrasive particle size and the density of single magnetic abrasive.(2) The hardness of magnetic abrasive is influenced by sintering temperature, sintering pressure and heat preservation time, the ratio of Fe powder and SiC powder.(3) Mapping the curve of B-H and B-I, it concludes magnetic induction increases with magnetic field intensity and current increasing and finds the size of the magnetic field intensity and current when magnetic induction of magnetic abrasive reaches saturation.(4) The paper analyses that the performance of magnetic abrasive finishing is influenced by the density index of single magnetic abrasive、the apparent density index of magnetic abrasive、the hardness index of magnetic abrasive、the saturation flux density index of magnetic abrasive.According to the above of conclusions, we see that SiC/Fe magnetic abrasive have better physical performance and processing ability and longer service life. This paper provides some valuable experimental data for the making of magnetic abrasive and promotes the further development of the magnetic abrasive finishing.