| 摘要 |
A die for molding, within a magnetic field, an arc-shaped magnet having polar-anisotropy orientation, and comprising: a die that comprises nonmagnetic ultra-hard alloy, and that is to be arranged within a parallel magnetic field; cavities formed in the die and having an arc-shaped cross section, each of which comprises an inner-arc wall, an outer-arc wall, and two side walls; a center ferromagnetic body arranged at the outer-arc wall side of the cavities; and pairs of side-section ferromagnetic bodies arranged symmetrically at each of the side-wall sides of the cavities. The die is characterized in having the cavities arranged so that the radial direction thereof at the center in the circumferential direction thereof matches the direction of the parallel magnetic field, having the width of the center ferromagnetic body in a direction perpendicular to the parallel magnetic field to be less than the width of the cavities, and having the pairs of side-section ferromagnetic bodies arranged so that the cavities are contained within areas sandwiched by the pairs of side-section ferromagnetic bodies. |
