407 粉末冶金用金型のダイ内孔仕様が圧粉成形に及ぼす影響

概要

論文の詳細を見る
A new tooling structure was studied for the purpose of producing P/M parts, which have no scuffing or cracking. The new tooling structure was evaluated for the effect that the surface roughness and the profile of the die wall have on the compressibility and the ejection force of the green compact from a die. The profile of the die wall was evaluated as to whether a taper die could help to reduce the ejection force. As a result of the research carried out, it was found that scuffing is caused the kinetic frictional behavior rather than the static frictional force on the ejection process. And it was found that scuffing appears in accordance with the kinetic frictional force increasing as the ejection progresses. Furthermore it was found that the taper die is more effective in improving the compressibility and reducing the ejection force, in particular the taper die is possible to prevent scuffing on account of the kinetic frictional force decreasing as the ejection progresses.
一般社団法人日本機械学会の論文
2003-09-19