鉄粉末の加圧流動成形(第1報) : 成形試験による粉末の流動性評価

概要

論文の詳細を見る
Compaction of powder to the shape of a deep wall cup, which was difficult to be formed by usual press compacting, was carried out by PPFM (Press Powder Flow Molding). The powder used was pure iron powder with a little resin binder (PVA : Poly Vinyl Alcohol) admixed or with lubricant (ZnSt) and some amount of liquid binder (Liquid Paraffin). Addition of Liquid Paraffin provided an increase in the cup wall density and hence the overall density of the green compact. Especially in case of adding 1.5wt% Liquid Paraffin, the difference in density between the cup wall and the bottom was a small enough to give higher density.<BR>Powder flowability during compaction was estimated from the density distribution in green compact and it could be concluded that the powder flowed from the cup bottom into the wall, because of the lubricating effect of the Liquid Paraffin. One advantage of this method over PIN (Powder Injection Molding) was that good flowability was achieved by the addition of smaller amount of binder.
社団法人粉体粉末冶金協会の論文