Device for manufacturing magnetically anisotropic magnets

Details Device for manufacturing magnetically anisotropic magnets Device for manufacturing magnetically anisotropic magnets

1990-07-19

1991-08-13

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Means for molding powdered metal

264108, 264DIG58, 425414, 425420, 425DIG33, B22F 312

Patent

active

050392921

ABSTRACT:
Disclosed is a device for manufacturing Nd-Fe-B alloy magnet materials, and in particular, for manufacturing an integral, columnar-ring-shaped Nd-Fe-B magnet which is multi-pole-magnetized along the circumference thereof and which is used as the rotor magnet of a high-efficiency stepping motor. The device of this invention is composed of a die punch, an upper and a lower punch having two concentric sections. The space is defined by the die and the upper and lower punches includes induction means for heating the green compact or the densified compact and sealing means for keeping the die under a reduced pressure condition or in an inert gas atmosphere.

REFERENCES:
patent: 3694127 (1972-09-01), Takahashi et al.
patent: 4087221 (1978-05-01), Munson et al.
patent: 4521360 (1985-06-01), Fiorentino
patent: 4710239 (1987-12-01), Lee et al.
patent: 4770723 (1988-09-01), Sagawa et al.
patent: 4818201 (1989-04-01), Howard

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