Development of trapezoid-shaped Nd-Fe-B die-upset magnets by preform method

Author

Iwasaki, K. ; Shinoda, M. ; Tanigawa, S. ; Tokunaga, M.

Author_Institution

Hitachi Metals Ltd., Saitama, Japan

Volume

28

Issue

5

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

2850

Lastpage

2852

Abstract

Basic investigations to apply the rapid quenched Nd-Fe-B die-upset technique to fabricate trapezoid-shaped magnets with high energy product were undertaken. Stress around the magnets with indentations during die-upsetting was evaluated by computer simulation. The dimensions of preform shape for isotropic consolidated magnets before hot deformation were determined from compression tests using an aluminum alloy. Hot deformation to obtain the final trapezoid-shape was divided into two steps. The total reduction in height during compression exceeded ~72%, and the finished magnets had no cracks. By this method, trapezoid-shaped die-upset magnets with a high energy product of >320 kJ/m³ have been fabricated

Keywords

boron alloys; iron alloys; neodymium alloys; permanent magnets; quenching (thermal); NdFeB; compression tests; computer simulation; die-upset magnets; energy product; hot deformation; isotropic consolidated magnets; preform method; rapid quenching; stress; Aluminum alloys; Computer simulation; Electron traps; Magnetic anisotropy; Magnetic materials; Magnets; Plastics; Preforms; Tensile stress; Testing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.179648

Filename

179648