| 摘要 |
PURPOSE:To obtain the titled device of a small type, and moreover enabled to realize orientation of a magnetic field in the radial direction by a method wherein a permanent magnet is used for generation of an applying magnetic field, and is arranged having multiple poles in an inside wall metal mold prescribing the inside face of a cylindrical cavity. CONSTITUTION:When a slurry of ferrite powder is pressed in a cavity 10 from a supply hole 5, the powder is orientated in the radial direction according to the magnetic force of a permanent magnet body 3. By making a lower punch 4 to ascend in this condition, because the slurry is compressed, water thereof is forced out from a filtering hole 6, the ferrite powder is dehydrated, and is molded in the dense condition from the rough condition. The permanent magnet body 3 for application of the magnetic field is made to have 8 poles, for example, the slurry of strontium ferrite powder is molded in the cylindrical type, and after the molded body thereof is sintered at 1,220 deg.C, it is magnetized to have 8 poles in the direction the same with the applying direction of anisotropy. |
