Title :
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
fDate :
9/1/1992 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
