Study on internal magnetic abrasive finishing of thin and long austenitic stainless steel tube

An internal magnetic abrasive finishing process is proposed for producing highly finished inner surfaces of tubes used in critical applications including clean gas or liquid piping systems. The process principle and the finishing characteristics of unbonded magnetic abrasive within internal tubing finishing are described in this study. The Magnetic Abrasive Finishing (MAF) setup being mounted on lathe machine is designed for finishing long and thin austenitic stainless steel tubings. A series of comparison experiments show that AlNiLo magnetic abrasive particles (MAP) are most effective among five kinds of MAP. On the other hand, a lot of technological experiments are made and the effect of each factor on the machining performance during the process is investigated. Experimental results indicate that finishing parameters such as polishing speed, surface magnetic fields, abrasive material and grain size and polishing time have critical effects on the performance of MAF process.