Experimental Investigation of Magnetic Abrasive Finishing for Super Precision Polishing of Inner Surface of the Ceramic Tube

Super polishing of the inner surface of the whole ceramic tube was achieved by applying magnetic abrasive finishing (MAF) and utilizing an external magnetic field controlling the magnetic particles brush movement inside the ceramic tube. By combining the theoretical analysis with experimental results,the feasibility that applying MAF to polish inner surface of the ceramic tube was verified. In order to improve grinding efficiency,using software simulation analysis and experimental verification,adding the V-shaped magnet into the ceramic tube was proposed. This changed lines of magnetic force distribution of the magnetic circuit and increased the magnetic flux density of the work area,and grinding efficiency can be doubled. Through the experiments,the effects of the amount of slurry,iron particle size,diamond particle size and other parameters on the quality and efficiency of the grinding the inner surface of the ceramic tube were analyzed. The process parameters were optimized design. The test results proved that surface roughness R_a values of inner of the ceramic tube after MAF can be reduced from 0.40 μm to 0.02 μm,which was a mirror polishing. This method provided a new approach for ultra-precision polishing the inner surface of ceramic tube.