Permanent magnet manufacturing method and press apparatus
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United States of America Patent
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Mar 18, 2008
Grant Date -
Dec 2, 2004
app pub date -
Oct 18, 2002
filing date -
Oct 31, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An anisotropic bonded magnet is produced at a low cost by avoiding various problems caused by remanence. Also, the unit weight and density of a compact is increased by filling even a cavity, having no easily feedable shape, with a magnet powder just as intended. An anisotropic bonded magnet is produced by feeding the cavity of a press machine with a magnetic powder (e.g., an HDDR powder) and compacting it. After the magnetic powder has been positioned outside of the cavity, an oscillating magnetic field (e.g., an alternating magnetic field) is created in a space including the cavity. The magnetic powder is transported into the cavity while being aligned parallel to the oscillating direction of the oscillating magnetic field. Thereafter, the magnetic powder is compressed within the cavity to make a compact for an anisotropic bonded magnet.
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