磁気研磨法による内面の平滑加工に関する研究 : ステンレス鋼円管内面およびクリーンガスボンベ内面の精密研磨

抄録

The internal finishing of nonferromagnetic tubing is performed by means of the magnetic force generated between magnetic abrasives and the N-S magnetic poles placed around the outside of the tubing. In this experiment, mixing-type magnetcic abrasives are used for the first time in which large-sized iron particles are mixed with magnetic abrasives. Large-sized iron particles generate finishing pressure and magnetic abrasive also have a finishing effect on the inner surface of the tubing. By this new process using the mixing-type magnetic abrasives, the finishing efficiency is increased markedly. Specifically, this paper describes the effects of both the size and the mixing weight percentage of iron particles on the surface roughness of stainless steel tubing. Then, it describes application of the new process to the internal finishing of the bottom of a clean gas bomb made for practical use. As a result, the surface roughness before finishing, 7 μm R_max, was improved to 0.2 μm R_max all over the inner surface at the bottom.