Preform design for powdered magnet sinter-forging process with curved shape

Abstract

Permanent magnets of Nd-Fe-B group have kept a key post in the permanent magnet market and used in various parts. Tube Process is a process to produce permanent magnets using deformable tube. It is difficult to manufacture permanent magnets from Nd-Fe-B green powder with the Tube process due to folding resulting from high height reduction and localized densification. In this paper, preform design of the Tube Process is carried out in the direction of reducing folding and increasing uniform densification. Selective reduced integration scheme and directional reduced integration scheme are used to reduce zero energy mode.