Abstract
Deep cup shaped compact were formed by a uniaxial press from soft ferrite granule inclurding small amount of resin binder PVA (Polyvinyl Alchohol) and liquid paraffin. This granule could be automatically filled into a cylindrical die cavity and pressed by a single stepped punch. In the case of green compact formed from granule with the sufficient flowability, the densified powder flowed from the bottom to the cup wall during compaction, and the difference in partial density of green compact could be reduced. This is caused by reason that liquid paraffin affects the lubrication between powders during compaction. When the difference in partial density of green compact was small, the diameter of sintered compact along the bottom to cup wall was shrinked uniformly from green compact.
