The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 2018
Filed:
Oct. 04, 2013
Noritaka Miyamoto, Toyota, JP;
Daisuke Ichigozaki, Nisshin, JP;
Tetsuya Shoji, Toyota, JP;
Eisuke Hoshina, Toyota, JP;
Akira Kano, Toyota, JP;
Osamu Yamashita, Toyota, JP;
Noritaka Miyamoto, Toyota, JP;
Daisuke Ichigozaki, Nisshin, JP;
Tetsuya Shoji, Toyota, JP;
Eisuke Hoshina, Toyota, JP;
Akira Kano, Toyota, JP;
Osamu Yamashita, Toyota, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Aichi, JP;
Abstract
Provided is a method for manufacturing a rare-earth magnet capable of manufacturing a rare-earth magnet with high degree of orientation by sufficient plastic deformation while suppressing cracks at the side faces of a compact that is plastic-deformed during the hot deformation processing. The method includes a step of preparing a compact S, preparing a plastic processing mold including a die D in which a cavity Ca is provided, and punches P that are slidable in the cavity Ca, the cavity Ca having a cross section that is larger in cross-sectional dimensions than a cross section of the compact S that is orthogonal to a pressing direction by the punches P; and a step of placing the compact S in the cavity Ca and performing hot deformation processing, thus manufacturing an orientational magnet C. Let that Wdenotes a length of a short side of the cross section of the cavity Ca and tdenotes a length of a side of the cross section of the compact S that is placed in the cavity Ca, the side corresponding to the short side of the cavity Ca, t/Wis within a range of 0.55 to 0.85, and from some stage during the hot deformation processing, a part of the compact S is constrained at a side face of the cavity Ca so that deformation of the compact is suppressed, but another part of the compact is in a non-constraint state.