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US 6,602,352 B2Granted
Method for manufacturing rare earth magnet and powder compacting apparatus
AssigneeSumitomo Special Metals Co., Ltd.
InventorsShuhei Okumura, Akira Nakamura
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Abstract
A method and apparatus for manufacturing a rare earth magnet is disclosed. In a first step, a compact is produced by compacting rare earth alloy powder in a predetermined space in an orienting magnetic field. Next, a demagnetizing process is performed for the compact, and the compact is ejected from the predetermined space. Then, a additional demagnetizing process is performed for magnetic powder adhering to a surface of the compact by applying an magnetic field to the compact after the compact is ejected.
Claims28
A method for manufacturing a rare earth magnet comprising:
- a first step of producing a compact by compacting rare earth alloy powder in a predetermined space in an orienting magnetic field;
- a second step of performing a demagnetizing process for the compact by applying a first magnetic field to the compact;
- a third step of ejecting the compact from the predetermined space after the second step;
- and
- a fourth step of performing a demagnetizing process for magnetic powder adhering to a surface of the compact by applying a second magnetic field to the compact after the third step.
2 more elements
Dependencies are inferred from the claim text.