Title:
PREFORM, PREFORMING METHOD, AND METHOD OF PRODUCING COMPRESSION-BONDED MAGNET
Document Type and Number:
WIPO Patent Application WO/2024/028989
Kind Code:
A1
Abstract:
Provided is a novel form of preform making it possible to ensure shape retention and handleability while also curbing a decline in magnetic properties of a bonded magnet. The present invention is a preform that has: an outer shell formed by the binding of some of a powdered or granulated raw magnet material made of a mixed or kneaded product of magnet particles and thermosetting resin; and an inner part made of the remainder of the raw magnet material inside the outer shell. The outer shell is, for example, a portion where the thermosetting resin has bound while still uncured. The inner part is made of a powdered or granulated raw magnet material. Such a preform is obtained, for example, through a preforming step for warm pressurizing/forming of the raw magnet material. The preforming step is carried out, for example, by setting a preforming temperature (Tp), which is the temperature of an inner wall surface of a preforming mold to be filled with the raw magnet material, to ts ≤ Tp ≤ ts + 20°C (ts: softening point of the thermosetting resin).
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Inventors:
TSUGE YUKI (JP)
Application Number:
PCT/JP2022/029704
Publication Date:
February 08, 2024
Filing Date:
August 02, 2022
Export Citation:
Assignee:
AICHI STEEL CORP (JP)
International Classes:
B22F3/00; H01F41/02; H01F7/02
Domestic Patent References:
| WO2010067592A1 | 2010-06-17 |
Foreign References:
| JPH06314605A | 1994-11-08 | |||
| JP2021015835A | 2021-02-12 | |||
| JP2004349337A | 2004-12-09 | |||
| JPH10264119A | 1998-10-06 | |||
| JP2006351957A | 2006-12-28 |
Attorney, Agent or Firm:
MORIOKA Masayuki et al. (JP)
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