Sughrue, Mion, Zinn, Macpeak & Seas
Method and apparatus for producing anisotropic rare earth magnet
 A method for producing an anisotropic rare earth magnet is improved by applying compressing stress on a free surface of an compacted material at the time of extruding the compacted material in order to prevent forming cracks, and improved by using a double action punch provided with a core punch and a sleeve punch so as to mold a compacted material and extrude the compacted material into the anisotropic magnet material in a single heat process continuously. 
Daido Tokushuko Kabushiki Kaisha
H H B B H B
H01F H01F B22F B22F H01F B30B
inventional inventional inventional inventional inventional inventional
Yutaka Toshiya Shinichiro Hiyoshi Yasuaki Makoto Norio Teruo
Yoshida Kinami Yahagi Yamada Kasai Saito Yoshikawa Watanabe