Consolidation by severe plastic deformation in compaction of magnetic powder cores and bonded magnets

• Project/Area Number: 25820368
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Toyohashi University of Technology
• Principal Investigator: MAENO Tomoyoshi 豊橋技術科学大学, 工学(系)研究科(研究院), 助教 (80505397)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: 圧粉成形 / 強加工 / 粉末固化 / 焼付き抑制 / 高強度化 / 高密度化

Outline of Final Research Achievements

The magnetic powder cores and the bonded magnets are consolidated with a binder such as an epoxy resin after the compaction. However the magnetic performance is decreased since the proportion of the magnetic powder in a magnet is reduced by the addition of the binder. Reduction of the binder will lead to a reduction in strength of the products and an increase of the friction during ejection after compaction. To improve strength of the bonded magnets and magnetic powder cores having low percentage of the binder. A consolidation process by severe plastic deformation in compaction was developed. In addition, the friction during ejection was reduced by changing the inner diameter of a die before and after compaction using a shrinkage ring.

Research Products

• [Presentation] 強加工圧粉によるNd-Fe-B円筒ボンド磁石の強度向上 (2015)
  • Author(s): 前野智美，谷口俊哉，森謙一郎
  • Organizer: 平成27年度塑性加工春季講演会
  • Place of Presentation: 慶應義塾大学 矢上キャンパス
  • Year and Date: 2015-05-29 – 2015-05-31
• [Presentation] 摩擦援用および背圧付加押出しによるNd-Fe-B磁性粉末の高結合化 (2014)
  • Author(s): 前野智美, 谷口俊哉，森謙一郎
  • Organizer: 平成26年度塑性加工春季講演会
  • Place of Presentation: つくば国際会議場
  • Year and Date: 2014-06-06 – 2014-06-08
• [Presentation] 摩擦援用および背圧付加押出しによるNd-Fe-B磁性粉末の高密度化 (2014)
  • Author(s): 前野 智美， 谷口 俊哉， 森謙一郎
  • Organizer: 平成26年度塑性加工春季講演会
  • Place of Presentation: つくば国際会議場
• [Remarks] 高密度圧粉成形におけるダイスの締緩めによる抜出し荷重の低減
  • URL: http://plast.me.tut.ac.jp/sotsuken/h24b4/12taniguchi.pdf
• [Remarks] 鉄系粉末の圧粉成形におけるダイスの締緩めによる 抜出し焼付き抑制及び強せん断変形による粒子高結合化
  • URL: http://plast.me.tut.ac.jp/sotsuken/h24m2/12hirayama.pdf
• [Remarks] 背圧付加押出しによるボンド磁石の強度向上
  • URL: http://plast.me.tut.ac.jp/sotsuken/h26m2/14taniguchi.pdf