| 摘要 |
PURPOSE:To provide a surface treatment method higher in practicability by way of increasing processing speed and uniforming processing. CONSTITUTION:A non-magnetic pipe 1 is inserted into a through hole 2a of a rotary member 2, support blocks 3A, 3B of a magnetic body are adhered at facing positions on the inner peripheral surface of the through hole 2a, and on a support block end surface, permanent magnets 4A, 4B are attached. On the inner surface of the non-magnetic pipe 1, magnetic abrasive grains are supplied, and by moving the rotary member 2 in the axial direction while rotating the rotary member 2 around an axis of the non-magnetic pipe 1 as its center, inner surface polishing is carried out. Hereby, facing pole faces of the permanent magnets 4A and 4B are the same magnet pole, and around the non-magnetic pipe 1, a repulsive magnetic field is formed. In the repulsive magnetic field, as a rate of change of a magnetic field on the inner surface of the non-magnetic pipe 1 increases and processing pressure increases, a contact amount and a contact area to the inner surfaces of magnetic abrasive grains increases, and component force in the direction along the inner surface of a non-magnetic body in magnetic force is large, and accordingly, processing force increases as a whole. |
