公开(公告)号：US20180043474A1

公开(公告)日：2018-02-15

申请号：US15549784

申请日：2016-04-19

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Hideyuki HAMAMURA ,  Tatsuhiko SAKAI ,  Fumiaki TAKAHASHI ,  Hisashi MOGI ,  Shunsuke OKUMURA ,  Hirofumi IMAI

IPC: B23K26/364 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B23K26/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  B05D3/02 ,  B05D7/14 ,  C22C38/42 ,  C21D9/46

CPC classification number: B23K26/364 ,  B05D3/0254 ,  B05D7/14 ,  B23K26/359 ,  C21D3/04 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D7/00 ,  C21D8/005 ,  C21D8/12 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1294 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C2202/02 ,  C25F1/00 ,  H01F1/16

Abstract: Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. When an average value of a groove depth in a sheet thickness direction at a central portion of the groove in a longitudinal groove direction is set as an average groove depth D, a straight line, which connects a first point at which a groove depth in the sheet thickness direction becomes 0.05×D and a second point at which the groove depth becomes 0.50×D, at an inclined portion of the groove is set as a groove end straight line, an angle made by the steel sheet surface and the groove end straight line is set as a first angle θ, and an average value of a groove-width-direction length, which is a length of a line segment connecting two points at which a groove depth in the sheet thickness direction in a contour of the groove on the groove-width-direction cross-section becomes 0.05×D, is set as an average groove width W, an aspect ratio A obtained by dividing the average groove depth D by the average groove width W, and the first angle θ satisfy the following Expression (1). θ

公开(公告)号：US20170136575A1

公开(公告)日：2017-05-18

申请号：US15322399

申请日：2014-07-03

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Koji HIRANO ,  Hirofumi IMAI ,  Hideyuki HAMAMURA ,  Tatsuhiko SAKAI

IPC: B23K26/073 ,  C22C38/06 ,  C22C38/04 ,  H01F1/16 ,  C22C38/00 ,  B23K26/00 ,  B23K26/356 ,  C21D10/00 ,  C22C38/02

CPC classification number: B23K26/0736 ,  B23K26/073 ,  B23K26/356 ,  C21D8/12 ,  C21D10/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  H01F1/16

Abstract: In a laser processing apparatus for refining magnetic domains of a grain-oriented electromagnetic steel sheet by setting a laser beam to be focused on the grain-oriented electromagnetic steel sheet and scanned in a scanning direction, the laser beam focused on the grain-oriented electromagnetic steel sheet is linearly polarized light, and an angle between a linear polarization direction and the scanning direction is higher than 45° and equal to or lower than 90°.

公开(公告)号：US20170157706A1

公开(公告)日：2017-06-08

申请号：US15322362

申请日：2014-07-03

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Koji HIRANO ,  Hirofumi IMAI ,  Hideyuki HAMAMURA ,  Tatsuhiko SAKAI

IPC: B23K26/064 ,  C22C38/02 ,  H01F1/03 ,  C22C38/04 ,  C22C38/06 ,  C21D8/12 ,  C22C38/00

Abstract: In a laser processing apparatus for refining magnetic domains of a grain-oriented electromagnetic steel sheet by setting a laser beam to be focused on the grain-oriented electromagnetic steel sheet and scanned in a scanning direction, the laser beam focused on the grain-oriented electromagnetic steel sheet is linearly polarized light, and the angle between the linear polarization direction and the scanning direction is equal to or higher than 0° and lower than 45°.

公开(公告)号：US20180066334A1

公开(公告)日：2018-03-08

申请号：US15554555

申请日：2016-04-19

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Hisashi MOGI ,  Fumiaki TAKAHASHI ,  Hideyuki HAMAMURA ,  Tatsuhiko SAKAI ,  Hirofumi IMAI ,  Shunsuke OKUMURA

IPC: C21D9/46 ,  C22C38/42 ,  C22C38/34 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  B23K26/364 ,  H01F1/147

CPC classification number: C21D9/46 ,  B23K26/359 ,  B23K26/364 ,  B23K2103/04 ,  C21D3/04 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/12 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1283 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/42 ,  C22C38/60 ,  C22C2202/02 ,  H01F1/14783 ,  H01F1/16 ,  H01F1/18

Abstract: Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. In a case where the groove is seen on a longitudinal groove cross-section including a groove extension direction and the sheet thickness direction, an arithmetic average height Ra of a roughness curve, which constitutes a contour of a groove bottom region of the groove, is 1 μm to 3 μm, and an average length RSm of a roughness curve element, which constitutes the contour of the groove bottom region, is 10 μm to 150 μm.

公开(公告)号：US20180036838A1

公开(公告)日：2018-02-08

申请号：US15554659

申请日：2016-04-19

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Hideyuki HAMAMURA ,  Tatsuhiko SAKAI ,  Hisashi MOGI ,  Fumiaki TAKAHASHI ,  Hirofumi IMAI ,  Shunsuke OKUMURA

IPC: B23K26/364 ,  C25F3/06 ,  H01F1/16 ,  C21D8/12

CPC classification number: B23K26/364 ,  C21D8/1294 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/60 ,  C25F3/06 ,  H01F1/14766 ,  H01F1/16

Abstract: Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. In a case where the steel sheet surface is seen from the sheet thickness direction, the steel sheet surface is provided with a groove group that is constituted by a plurality of the grooves arranged in a sheet width direction, the grooves, which constitute the groove group, arc arranged in such a manner that adjacent grooves overlap each other on a projection plane perpendicular to the rolling direction, and a plurality of the groove groups are arranged with an interval in the rolling direction.

公开(公告)号：US20190048434A1

公开(公告)日：2019-02-14

申请号：US16080255

申请日：2017-03-31

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Takahito MIZUMURA ,  Fumiaki TAKAHASHI ,  Masato MIZOKAMI ,  Hisashi MOGI ,  Hideyuki HAMAMURA ,  Hirofumi IMAI ,  Shinya HAYASHI ,  Kenichi MURAKAMI

IPC: C21D8/12 ,  B32B3/30 ,  B32B15/04 ,  C22C38/60 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D6/00

Abstract: A grain-oriented electrical steel sheet includes a steel sheet having a surface on which grooves in which an extending direction crosses a rolling direction and a depth direction is parallel to a sheet thickness direction are formed. A molten solidified substance ranging in parallel to the groove exists on both sides of the groove on a surface of the steel sheet. A height becoming a maximum frequency in a height distribution of height data in which the surface of the steel sheet in a specific area including the groove is measured at regular intervals is set as a virtual plane, and when a space volume of recess parts recessed from the virtual plane is set as V1 and a volume of projection parts projected from the virtual plane is set as V2, a value of V2/V1 is more than 0.10 and less than 0.80. A plurality of projections are formed in the specific area, and among the plurality of projections, a width of a projection closest to the groove is larger than widths of the other projections. When an area where an average height in the extending direction is highest in the height distribution is seen in a groove longitudinal cross section including the extending direction and the sheet thickness direction, an average roughness Ra of a roughness curve forming a surface of the area is 0.30 to 2.00 μm, and an average length RSm of a roughness curve element forming the surface of the area is 10 to 150 μm.

公开(公告)号：US20150318091A1

公开(公告)日：2015-11-05

申请号：US14439996

申请日：2013-11-07

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Koji HIRANO ,  Hirofumi IMAI ,  Hideyuki HAMAMURA

IPC: H01F1/147 ,  C21D6/00 ,  H01F41/02 ,  C22C38/02 ,  C22C38/06 ,  H01F1/16 ,  C21D1/34 ,  C21D9/46

CPC classification number: H01F1/14775 ,  C21D1/34 ,  C21D6/008 ,  C21D8/02 ,  C21D8/10 ,  C21D8/12 ,  C21D8/1294 ,  C21D9/46 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  H01F1/16 ,  H01F41/02

Abstract: A laser processing apparatus includes a laser irradiation unit has a structure providing an intensity distribution of the laser beam focused on the grain-oriented electrical steel sheet on a cross-section in a direction perpendicular to the scanning direction on the grain-oriented electrical steel sheet so as to satisfy Ib/Ia≦2, where Ra1 and Ra2 are distances between the centroid of the intensity distribution and positions at which the intensity integration value from the centroid of the intensity distribution is 43% of the total intensity integration value, beam intensities Ia1 and Ia2 are intensities of the laser beam corresponding to Ra1 and Ra2, respectively, Ia is the average value of Ia1 and Ia2 and Ib is the beam intensity at the centroid of the intensity distribution.

Abstract translation: 激光加工装置包括激光照射单元，其具有在与取向电工钢板上的扫描方向垂直的方向的横截面上提供聚焦在方向性电磁钢板上的激光束的强度分布的结构 以满足Ib / Ia＆nlE; 2，其中Ra1和Ra2是强度分布的质心与强度分布的质心的强度积分值之间的距离是总强度积分值的43％的距离，束强度 Ia1和Ia2分别是对应于Ra1和Ra2的激光束的强度，Ia是Ia1和Ia2的平均值，Ib是强度分布的质心处的光束强度。