An apparatus for producing a ring-shaped powder compact and methods of making a sintered ring magnet

An apparatus for producing a ring-shaped powder compact (30) said apparatus comprising: - an annular shape (31) with elasticity; - a core (32) which is arranged on the inside of a curved inner surface of the mold (31); and - a pressing member (36) for pressurizing both the mold (31) as well as magnetic powder into a between the mold (31) and the core (32) formed cavity (35) is filled in the axial direction of the mold (31) wherein the mold (31) is adapted to deform and the manner of an expansion in the direction inwardly towards a central axis to apply the magnetic powder (47) radially inwardly with pressure; - wherein the curved inner surface of the mold (31) at least partially along its axial direction in their cross-sectional shape from one location to the next location along the axial direction of the mold (31) when viewed in planes perpendicular to a central axis of ...