Canon Kabushiki Kaisha

Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Fumiaki Takahashi

Kenji Hatori

Hisashi Mogi

Hideo Takiguchi

Hideyuki Hamamura

Masakazu Matsugu

Toshiaki Kondo

Takashi Aizawa

Akira Mamiya

Akira Suga

Takahito Mizumura

Hideaki Kawamura

Koji Hatanaka

Masato Mizokami

Tatsuhiko Sakai

Hirofumi Imai

Kotaro Yano

Shuichi Yamazaki

Tatsushi Katayama

Shunsuke Okumura

Satoshi Arai

Kazutoshi Takeda

Hiroshi Fujimura

Yoshiyuki Ushigami

Hiroyasu Fujii

Takashi Kataoka

Yoshiaki Natori

Tetsuro Nose

Shinji Yamamoto

Masaru Takahashi

Shuichi Nakamura

Shinsuke Takatani

Kenichi Murakami

Yosato Hitaka

Masashi Nakabayashi

Norikazu Fujii

Chiaki Mikawa

Kazumi Mizukami

Seiki Takebayashi

Teruyuki Tamaki

Shinya Hayashi

Kanako Yamakawa

Norihiro Yamamoto

Masao Yabumoto

Eisuke Minematsu

Hidehiko Morita

Fumikazu Andou

Masahide Urago

Toshihiko Uemura

The present invention provides a magnetic core and transformer which are reduced in core loss. The magnetic core according to the present invention comprises a core member which is formed by winding first electrical steel sheets, which is ring shaped seen from a side surface, and which has one or more bent parts seen from a side surface and one or more stacks of second electrical steel sheets stacked together, each the stack being arranged at least at one of the surfaces formed by side surfaces of the first electrical steel sheets at a bent part of the core member so that a surface formed by side surfaces of the second electrical steel sheets runs along it.

Magnetic core and transformer

A coating agent for forming a grain-oriented electrical steel sheet coating able to form an aluminum borate coating high in adhesion and large in tension and a method for manufacturing the grain-oriented electrical steel sheet are provided. The coating agent for forming a grain-oriented electrical steel sheet coating of the present invention comprises an aluminum source containing aluminum oxide and/or an aluminum oxide precursor compound, a boron source containing a borate of an alkali metal, and silicon oxide and/or a silicon oxide precursor in an amount, converted to silicon oxide, of 5 mass % or more and 10 mass % or less with respect to a total solids concentration of the aluminum source and boron source, the aluminum source and the boron source contained so that, by molar ratio, Al/B: 0.5 to 2.0, a solids concentration of a total of the aluminum source and the boron source being 20 mass % or more and 38 mass % or less, and pH being 2.0 or more and 6.0 or less.

Coating agent for forming grain-oriented electrical steel sheet coating and method for manufacturing grain-oriented electrical steel sheet

When joining end faces of a plurality of soft magnetic sheets which are superposed in the sheet thickness direction and which are bent at parts forming corner areas of a core, offset of positions of the end faces from the desired positions is suppressed. In a region of a window part comprised of a region inside of a first partand second part, a third partwith a length in a longitudinal direction (X-axial direction) the same as a length in the X-axial direction of the window part at the position where the third partis arranged is arranged so as to contact the region of the inner circumferential surface between the first corner areaand third corner area

Magnetic core

Grain-oriented electrical steel sheet having an aluminum borate coating able to impart larger tension that the past and a method for manufacturing grain-oriented electrical steel sheet are formed. The grain-oriented electrical steel sheet according to the present invention has a steel sheet and an insulating coating formed on the steel sheet and containing aluminum and boron, where the oxides contain crystalline oxides and a maximum value of an emission intensity ratio of boron with respect to aluminum at an interface between the insulating coating and the steel sheet, analyzed by glow discharge optical emission spectrometry, is 2.5 times or more and 4.0 times or less of the emission intensity ratio of boron with respect to aluminum in the insulating coating.

Grain-oriented electrical steel sheet and method for manufacturing grain-oriented electrical steel sheet

The grain-oriented electrical steel sheet according to the present invention is a grain-oriented electrical steel sheet having a base steel sheet (), an intermediate layer () disposed to be in contact with the base steel sheet (), and an insulation coating () disposed to be in contact with the intermediate layer (), and the grain-oriented electrical steel sheet includes a surface of the base steel sheet () having a groove (G) which extends in a direction intersecting a rolling direction of the base steel sheet (), in which in a cross-sectional view of a plane parallel to the rolling direction and a sheet thickness direction of the base steel sheet (), when a region between end portions of the groove (G) is defined as a groove part (R), an average thickness of the intermediate layer () of the groove part (R) is 0.5 times or more and 3.0 times or less an average thickness of the intermediate layer () other than the groove part (R), and an area ratio of voids in the insulation coating () of the groove part (R) is 15% or less.

Grain-oriented electrical steel sheet and method for manufacturing the same

Provided is a wound core formed by laminating a plurality of bent bodies obtained by forming a coated grain-oriented electrical steel sheet in which a coating is formed on at least one surface of a grain-oriented electrical steel sheet so that the coating is on an outside, in a sheet thickness direction, in which the bent body has a bent region obtained by bending the coated grain-oriented electrical steel sheet and a flat region adjacent to the bent region, the number of deformation twins present in the bent region in a side view is five or less per 1 mm of a length of a center line in the sheet thickness direction in the bent region, and when a region extending 40 times a sheet thickness to both sides in a circumferential direction from a center of the bent region on an outer circumferential surface of the bent body is defined as a strain affected region, a proportion of an area where the coating is not damaged at any position along the circumferential direction in a flat region within the strain affected region is 90% or more.

Wound core and method for producing same

A grain-oriented electrical steel sheet according to the present invention includes a base steel sheet having plural grooves on a surface and a glass film formed on the surface of the base steel sheet. In case of viewing region including grooves in cross section orthogonal to groove longitudinal direction, a straight line passing through peak point present on profile line of glass film and parallel to groove width direction orthogonal to sheet thickness direction in cross section is defined as reference line, a point present on boundary line between glass film and base steel sheet and present at lowest location in sheet thickness direction is defined as deepest point, and a point present on boundary line and present at the highest location in the sheet thickness direction in region having the deepest point in a center and having length of 2 &#x3bc;m in groove width direction is defined as shallowest point, a relationship between shortest distance A between reference line and deepest point and shortest distance B between reference line and shallowest point satisfies Expression (1).0.1 &#x3bc;m&#x2264;&#x2264;5.0 &#x3bc;m&#x2003;&#x2003;(1)

Grain-oriented electrical steel sheet and manufacturing method thereof

A grain-oriented electrical steel sheet includes: a chemical composition represented by, in mass %, Si: 2.0% to 5.0%, Mn: 0.03% to 0.12%, Cu: 0.10% to 1.00%, sb or Sn, or both thereof: 0.000% to 0.3% in total, Cr: 0% to 0.3%, P: 0% to 0.5%, Ni: 0% to 1%, and the balance: Fe and impurities, in which an L-direction average diameter of crystal grains observed on a surface of the steel sheet in an L direction parallel to a rolling direction is equal to or more than 3.0 times a C-direction average diameter in a C direction vertical to the rolling direction.

Grain-oriented electrical steel sheet and hot-rolled steel sheet for grain-oriented electrical steel sheet

A grain-oriented electrical steel sheet according to the present invention has a steel sheet surface provided with grooves and includes two or more broken lines including the grooves having a length of 5 to 10 mm on a straight line intersecting a rolling direction on the steel sheet surface. In each of the broken lines including the grooves, the grooves are arranged at equal intervals, and a ratio of the length of the groove to a length of a non-groove is in a range of 1:1 to 1.5:1.

Grain-oriented electrical steel sheet

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, are 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.

A grain-oriented electrical steel sheet includes: a chemical composition represented by, in mass %, Si: 1.8% to 7.0%, Cu: 0.03% to 0.60%, and the balance: Fe and impurities; and a primary coating film containing forsterite on a surface of the steel sheet, in which a Cu/Fe light-emitting intensity ratio at an interface region between the primary coating film and the surface of the steel sheet is 0.30 or less.

Grain-oriented electrical steel sheet and decarburized steel sheet used for manufacturing the same

A wound core is formed by laminating a plurality of bent bodies formed from a grain-oriented electrical steel sheet having a coating containing phosphorus formed on a surface, in a sheet thickness direction of the grain-oriented electrical steel sheet, in which the bent body is formed in a rectangular shape by having four flat portions and four corner portions adjacent to the flat portions, the corner portion has a bent region having a total bending angle of approximately 90&#xb0; in a side view, the number of deformation twins present in the bent region in the side view is five or less per 1 mm of a length of a center line in the bent region in the sheet thickness direction, and the amount of phosphorus eluted from the corner portion in a case of being boiled in water for 30 minutes is 6.0 mg or less per 1 mof a surface area of the corner portion.

Wound core and manufacturing method thereof

An apparatus captures an image of a measuring instrument that is captured by an imaging apparatus, sets an area in the image as an edge detection processing target in response to a user operation, and executes edge detection processing on the set area in the image. Further, the image processing apparatus sets a value for correcting a position of a detected edge portion. The image processing apparatus corrects the position of the detected edge portion based on the set value and calculates a value indicated by a pointer of the measuring instrument according to the corrected position of the edge portion.

Image processing apparatus and method of controlling the same and recording medium

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. An average depth D of the groove is greater than 10 &#x3bc;m and equal to or less than 40 &#x3bc;m in a case where the groove is seen on a groove-width-direction cross-section that is perpendicular to a groove extension direction, when a center of the groove in the groove width direction is defined as a groove width center, a deepest portion of the groove deviates from the groove width center toward one side in the groove width direction, and a cross-sectional shape of the groove is asymmetric with respect to the groove width center as a reference in the groove width direction.

Growing community of inventors

Kawasaki, Japan

Fumiaki Takahashi