Sughrue, Mion, Zinn, Macpeak & Seas
Method of forming thin-walled elongated cylindrical compact for a magnet
 A method of forming a cylindrical compact for a cylindrical magnet is improved by moving a core pin and a die of a mold at the same time of pressing magnet materials with a pressing punch in the same direction as that of the pressing punch at travelling speed Vc and Vd indicated by following equation: EQU Vc=m.multidot.Vp(0.5.ltoreq.m.ltoreq.1.0) EQU Vd=n.multidot.Vp(0.5.ltoreq.n.ltoreq.1.0) where Vc is the travelling speed of the core pin, Vd is the travelling speed of the die and Vp is the pressing speed of the pressing punch. It is possible to form the thin-walled elongated cylindrical compact by utilizing the frictional force caused between the mold and the magnet materials for forming the compact very effectively in order to obtain a thin walled elongated cylindrical magnet. 
Daido Tokushuko K.K.
B B H Y H
B30B B22F H01F Y10S H01F
inventional inventional inventional additional inventional
Yutaka Hiyoshi Yasuaki Norio Teruo
Yoshida Yamada Kasai Yoshikawa Watanabe