MANUFACTURING METHOD OF RARE EARTH IRON-SINTERED MAGNET, MANUFACTURING APPARATUS OF RARE EARTH IRON-SINTERED MAGNET AND RARE EARTH IRON-SINTERED MAGNET

Title:

MANUFACTURING METHOD OF RARE EARTH IRON-SINTERED MAGNET, MANUFACTURING APPARATUS OF RARE EARTH IRON-SINTERED MAGNET AND RARE EARTH IRON-SINTERED MAGNET

Document Type and Number:

Japanese Patent JP2023084424

Kind Code:

A

Abstract:

To provide a manufacturing method of a rare earth iron-sintered magnet, the method materializing suppression of a coarse particle generated in an interface between rare earth iron-magnetic powders, the method thereby enabling improvement of the magnetic characteristics of the rare earth iron-sintered magnet.SOLUTION: A manufacturing method of a rare earth iron-sintered magnet according to an embodiment comprises the steps of: filling rare earth iron-magnetic powders made by means of super-rapid quenching into a metallic mold; setting the metallic mold in a sintering device, supplying a prescribed current from an electrode and pressurizing and heating the filled rare earth iron-magnetic powders to make a sintered magnet body; and magnetizing the sintered magnet body by a magnetization device. The metallic mold is constituted of: a hollow cylindrical die; a punch which is inserted into the die; and die supports which are formed of conductive materials and arranged on both axial ends of the die. The rare earth iron-magnetic powders are filled into a cavity formed by the die and the punch. The die includes: an inner die which is made of a non-conductive material; and an outer die which is made of the conductive material and arranged on the outside of the inner die. The inner periphery of the die support is in contact with the outer periphery of the outer die and the electrode is in contact with the die support.SELECTED DRAWING: Figure 1

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Inventors:

OGAWARA YU
YUKIMURA HARUHIRO
ITO YUKI
NAKAYA HEKI

Application Number:

JP2021198596A

Publication Date:

June 19, 2023

Filing Date:

December 07, 2021

Export Citation:

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Assignee:

MINEBEAMITSUMI INC

International Classes:

H01F41/02; H01F1/057; H01F13/00

Attorney, Agent or Firm:

Toranomon Intellectual Property Office

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