Method of manufacturing bonded magnets of rare earth metal, and bonded magnet of rare earth metal
US6500374B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1999 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Feb 26, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1355
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides a method for manufacturing a rare-earth bonded magnet as follows: A compound 10, prepared by pelletizing a kneaded mixture of a rare-earth-bonded-magnet composition containing a rare-earth magnet powder, a binder resin and an antioxidant, is stored in a hopper 91, and fed into a cylinder 3 through a feeding pipe 92. Meanwhile, piston 81 is extended by driving an oil-hydraulic cylinder 8, and moved downward to compact the compound 10 fed into the cylinder 3 while gradually transferring the compound downward inside the cylinder 3. The cylinder 3 and a heating portion 41 are heated by heaters 5, the compound 10 passing therethrough is heated to become a melted material 11, and the melted material 11 is continuously extruded out from a die 4 in the downward-vertical direction, and is then cooled and solidified when passing through a tip portion 43, thus obtaining a molded body 12 of a rare-earth-bonded-magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.