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    LAMINATED CORE, LAMINATED CORE MANUFACTURING METHOD, AND ELECTRIC MOTOR
    7.
    发明申请
    LAMINATED CORE, LAMINATED CORE MANUFACTURING METHOD, AND ELECTRIC MOTOR 有权

    公开(公告)号：US20220025228A1

    公开(公告)日：2022-01-27

    申请号：US17296583

    申请日：2019-12-17

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Shinsuke TAKATANI ,  Hiroyasu FUJII ,  Kazutoshi TAKEDA

    IPC: C09J163/00 ,  B32B7/12 ,  B32B15/01 ,  C09J151/08 ,  C09J11/06 ,  C09J133/12 ,  H02K1/12 ,  H02K15/02

    Abstract: Provided is an electric motor using a laminated core in which punched electrical steel sheets are adhered to each other with a high adhesion strength. The laminated core includes: a plurality of electrical steel sheets which are stacked on each other and of which both surfaces are coated with an insulation coating; and an adhesion part which is disposed between the electrical steel sheets adjacent to each other in a stacking direction and adheres the electrical steel sheets to each other, wherein all sets of the electrical steel sheets adjacent to each other in the stacking direction are adhered to each other by the adhesion parts, wherein the adhesion parts are provided at a plurality of positions between the electrical steel sheets, and wherein the adhesion part is a layer made of an adhesive containing any one or both of an acrylic resin and an epoxy resin and having an SP value of 7.8 to 10.7 (cal/cm3)1/2.

    METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
    8.
    发明申请
    METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET 有权

    公开(公告)号：US20210388459A1

    公开(公告)日：2021-12-16

    申请号：US17422618

    申请日：2020-01-16

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Yoshiyuki USHIGAMI ,  Shuichi NAKAMURA ,  Hiroyasu FUJII

    IPC: C21D9/46 ,  C22C38/34 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  C23C8/26 ,  C23C8/02 ,  C23C8/80 ,  H01F1/147

    Abstract: A method for manufacturing a grain-oriented electrical steel sheet includes: a silicon steel material production process of producing a silicon steel material; a hot rolling process of obtaining a hot rolled sheet by subjecting the silicon steel material to hot rolling; a cold rolling process of obtaining a steel sheet having a final sheet thickness by subjecting the hot rolled sheet to a single cold rolling process or to multiple cold rolling processes having intermediate annealing performed between cold rolling processes; a decarburization annealing process of subjecting the steel sheet to decarburization annealing using a decarburization annealing furnace including a heating area and a soaking area; and a final annealing process of applying an annealing separator having alumina as a main component to the steel sheet and subjecting the steel sheet to final annealing, wherein, in the decarburization annealing process, when X represents the Cr content of the silicon steel material in terms of mass %, an oxidation degree P1 of an atmosphere gas in the heating area satisfies the following Expression 1 and an oxidation degree P2 of an atmosphere gas in the soaking area satisfies the following Expression 2: 0.18X−0.008≤P1≤0.25X+0.15≤0.20  (Expression 1); and 0.01≤P2≤0.15  (Expression 2).

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