磁気研磨法による内面の平滑加工に関する研究 : 第3報,研磨圧力分布が研磨特性に及ぼす影響

The finishing pressure distribution over the finishing area is clarified in the case of magnetic abrasive machining of an internal surface of a tube. This paper shows that the finishing pressure distribution of the magnetic abrasives is affected by the magnetic field distribution over the finishing area, which controls the finishing characteristics. It is found that increases in excitation current and amount of magnetic abrasives supplied increase the finishing pressure by increasing the magnetic field strength. It is also found that both the magnetic field strength and its gradient are minimum at the center of the magnetic pole and maximum around the edge of the magnetic pole, a phenomenon called the "edge effect". Magnetic abrasives converge sequentially around the pole edge, generating high finishing pressure. The results of the finishing experiments indicate that the higher finishing pressure due to the edge effect increases the finishing efficiency.