WO2023190339A1 - 方向性電磁鋼板及びその製造方法 - Google Patents

方向性電磁鋼板及びその製造方法 Download PDF

Info

Publication number
WO2023190339A1
WO2023190339A1 PCT/JP2023/012197 JP2023012197W WO2023190339A1 WO 2023190339 A1 WO2023190339 A1 WO 2023190339A1 JP 2023012197 W JP2023012197 W JP 2023012197W WO 2023190339 A1 WO2023190339 A1 WO 2023190339A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic domain
grain
steel sheet
electrical steel
oriented electrical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/012197
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
悠祐 川村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to KR1020247031412A priority Critical patent/KR20240155269A/ko
Priority to EP23780349.9A priority patent/EP4502190A4/en
Priority to US18/832,012 priority patent/US20250115974A1/en
Priority to CN202380021593.7A priority patent/CN118696141A/zh
Priority to JP2024512459A priority patent/JPWO2023190339A1/ja
Publication of WO2023190339A1 publication Critical patent/WO2023190339A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the working steps
    • C21D8/1233—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00—Electron-beam welding or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
    • C21D8/1272—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1294—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a localised treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/33—Arrangements for noise damping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0233—Manufacturing of magnetic circuits made from sheets
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2201/00—Treatment for obtaining particular effects
    • C21D2201/05—Grain orientation

Definitions

  • the present disclosure relates to a grain-oriented electrical steel sheet and a method for manufacturing the same.
  • This application claims priority based on Japanese Patent Application No. 2022-052343 filed in Japan on March 28, 2022, the contents of which are incorporated herein.
  • a grain-oriented electrical steel sheet is a steel sheet that contains 7% by mass or less of Si and has a secondary recrystallized texture in which secondary recrystallized grains are accumulated in the ⁇ 110 ⁇ 001> orientation (Goss orientation).
  • Grain-oriented electrical steel sheets are mainly used as iron cores in power transformers, and there is a growing need for them to reduce noise as well as reduce energy loss (iron loss).
  • an object of the present disclosure is to provide a grain-oriented electrical steel sheet that can achieve both low core loss and low noise, and a method for manufacturing the same.
  • magnetic domain refining treatment is performed on magnetic domain control treatment lines that form an angle of 0° to 45° with respect to the rolling direction and are aligned in the rolling direction.
  • a magnetic domain refining processing line that represents the (2)
  • the average magnetic domain width is 500 ⁇ m or less.
  • the average magnetic domain width in the region is 500 ⁇ m or less.
  • the magnetic domain refining treatment lines exist in a non-single period.
  • the ratio of the magnetic domain refining treated lines to the total length of the magnetic domain control treated lines is It is 10% or more and 90% or less.
  • the magnetic domain refining treatment line is a groove.
  • the magnetic domain refining treatment lines are thermally strained.
  • the method for manufacturing a grain-oriented electrical steel sheet includes an image acquisition step of acquiring a magnetic domain image of the grain-oriented electrical steel sheet, and a a determining step of determining a location to which magnetic domain refining processing is applied among magnetic domain control processing lines that form an angle of 0° to 45° with respect to a direction perpendicular to the rolling direction of the electrical steel sheet and are aligned in the rolling direction; and the magnetic domain control processing. and a magnetic domain refining step of performing the magnetic domain refining process on the portion of the line determined in the determining step.
  • the determining step determines a location where the magnetic domain width is a predetermined value or more as a location to which the magnetic domain refining process is applied. .
  • the determining step uses two-dimensional Fourier transformation to determine the spatial distribution of the magnetic domain width from the magnetic domain image.
  • the magnetic domain refining step includes the magnetic domain refining treatment by laser or electron beam irradiation. I do.
  • the predetermined value is a value within the range of 400 ⁇ m to 600 ⁇ m.
  • the grain-oriented electrical steel sheet according to the embodiment of the present invention it is possible to achieve both low iron loss and low noise.
  • FIG. 1 is a block diagram showing the hardware configuration of an image acquisition device according to the present embodiment.
  • FIG. 1 is a block diagram showing the hardware configuration of an analysis device according to the present embodiment.
  • FIG. 1 is a schematic diagram showing the configuration of a laser irradiation device according to the present embodiment.
  • 1 is a flowchart showing a method for manufacturing a grain-oriented electrical steel sheet according to the present embodiment.
  • FIG. 3 is a schematic diagram illustrating a method of cutting out a plurality of partial regions from a magnetic domain image of a grain-oriented electrical steel sheet. This is an example of a plurality of partial Fourier images obtained by performing two-dimensional Fourier transformation on each of a plurality of partial regions cut out from a magnetic domain image of a grain-oriented electrical steel sheet.
  • FIG. 2 is a schematic diagram of an example of a magnetic domain image of a grain-oriented electrical steel sheet.
  • FIG. 1A shows the spatial distribution of 180° magnetic domain width (hereinafter simply referred to as "magnetic domain width") of a grain-oriented electrical steel sheet before magnetic domain refining treatment.
  • FIG. 1B shows the spatial distribution of magnetic domain widths after the surface of the grain-oriented electrical steel sheet of FIG. 1A is subjected to magnetic domain refining treatment.
  • the magnetic domain refining process here was performed by continuous wave laser irradiation along a magnetic domain control process line substantially perpendicular to the rolling direction (RD).
  • the "180° magnetic domain” refers to a magnetic domain whose magnetization direction is the ⁇ 100> orientation of the crystal and which is sandwiched between two 180° domain walls that are substantially parallel to the rolling direction. Moreover, the "width" of a 180° magnetic domain represents the distance between adjacent domain walls (domain wall interval).
  • the spatial distribution of the magnetic domain width shown in FIGS. 1A and 1B was derived from the magnetic domain image of the grain-oriented electrical steel sheet using two-dimensional Fourier transform, which will be described later.
  • FIG. 1C shows a region where the domain width has been subdivided by 50 ⁇ m or more before and after the domain refining process shown in FIGS. 1A and 1B, and shows the value of the original domain width at which subdivision occurred. This is a visualization.
  • regions where the effect of magnetic domain refining was 50 ⁇ m or more are regions where the original magnetic domain width was wide, and the effect of magnetic domain refining was particularly noticeable in regions where the original domain width was approximately 500 ⁇ m or more. I know that there is. That is, the effect of magnetic domain refining differs depending on the original magnetic domain width.
  • FIG. 2 shows the relationship between the magnetic domain width before laser irradiation and the magnetic domain width after laser irradiation at the same position.
  • the effect of reducing iron loss can be obtained by refining an area with a wide original magnetic domain width, and even if the domain refining process is applied to an area with a narrow original magnetic domain width, the iron loss can be reduced. It is thought that no effect will be obtained and that this will lead to an increase in hysteresis loss and deterioration of noise characteristics.
  • magnetic domain control is performed so that the magnetic domain refining process is performed preferentially mainly on the region of the grain-oriented electrical steel sheet where the original magnetic domain width is wide (for example, the region of about 500 ⁇ m or more).
  • magnetic domain control is performed so that the magnetic domain refining process is performed only on a region of the grain-oriented electrical steel sheet where the original magnetic domain width is wide (for example, a region of about 500 ⁇ m or more).
  • the region with a narrow magnetic domain width and the magnetic domain refining processing line overlap slightly.
  • FIG. 3 shows the hardware configuration of an image acquisition device 30 that acquires a magnetic domain image of a grain-oriented electrical steel sheet.
  • the image acquisition device 30 includes a light source section 31, a magneto-optical (MO) sensor 33, an image sensor 35, and a signal processing section 37.
  • MO magneto-optical
  • the light source section 31 has a light source made of a light emitting diode (LED), and irradiates the MO sensor 33 with light with a uniform polarization plane.
  • LED light emitting diode
  • the MO sensor 33 is a device that measures the structure of a magnetic material, and has an observation surface on which a magnetic material sample to be measured is placed.
  • the light emitted from the light source section 31 passes through the inside of the MO sensor 33 and is reflected by the reflective layer, and the reflected light passes through the inside of the MO sensor 33 again and is output to the outside of the MO sensor 33.
  • a grain-oriented electrical steel sheet is placed as a magnetic sample on the observation surface of the MO sensor 33, a leakage magnetic field is generated inside the MO sensor 33 according to the direction of spontaneous magnetization of the grain-oriented electrical steel sheet.
  • the magnetic field rotates the plane of polarization of the reflected light.
  • the image sensor 35 is a complementary metal-oxide-semiconductor (CMOS) image sensor, which images the reflected light from the MO sensor 33 on a light-receiving surface, performs photoelectric conversion, and sends the analog signal after photoelectric conversion to the signal processing unit 37. Output.
  • CMOS complementary metal-oxide-semiconductor
  • the signal processing unit 37 includes an amplifier, an AD converter, a Digital Signal Processor (DSP), and the like.
  • the analog signal output from the image sensor 35 is amplified by an amplifier and converted into a digital signal by an AD converter.
  • An image signal is generated by performing predetermined digital processing on this digital signal by a DSP.
  • the image signal generated by the signal processing unit 37 is output to the analysis device 40 (see FIG. 4) via a cable or by wireless communication.
  • FIG. 4 shows the hardware configuration of an analysis device 40 that analyzes the magnetic domain structure of grain-oriented electrical steel sheets.
  • the analysis device 40 is a computer device such as a personal computer (PC), and includes a calculation section 41, a memory 43, a display section 45, an input section 47, and a communication I/F 49.
  • PC personal computer
  • the calculation unit 41 has a Central Processing Unit (CPU), and according to a program stored in the memory 43, analyzes the magnetic domain structure from the magnetic domain image of the grain-oriented electrical steel sheet, and determines the location to which the magnetic domain refining process is applied. The processing executed by the calculation unit 41 will be described in detail later.
  • CPU Central Processing Unit
  • the memory 43 includes a Read Only Memory (ROM) and a Random Access Memory (RAM).
  • the ROM stores programs executed by the CPU of the calculation unit 41 and data necessary for executing these programs. Programs and data stored in the ROM are loaded into the RAM and executed.
  • the memory 43 may include a magnetic memory such as a hard disk drive (HDD), or an optical memory such as an optical disk.
  • the program and data may be stored in a computer-readable recording medium that is removable from the analysis device 40.
  • the program executed by the calculation unit 41 may be received from the network via the communication I/F 49.
  • the display unit 45 has a display such as a liquid crystal display (LCD), a plasma display, or an organic electroluminescence (EL) display, and displays an image based on the image signal output from the image acquisition device 30.
  • a display such as a liquid crystal display (LCD), a plasma display, or an organic electroluminescence (EL) display, and displays an image based on the image signal output from the image acquisition device 30.
  • the analysis results of the magnetic domain structure by the calculation unit 41 are displayed.
  • the input unit 47 includes input devices such as a mouse and a keyboard.
  • the communication I/F 49 is an interface for transmitting and receiving data with an external device via a network such as a Local Area Network (LAN), Wide Area Network (WAN), or the Internet.
  • LAN Local Area Network
  • WAN Wide Area Network
  • Internet the Internet
  • calculation unit 41 instead of general-purpose hardware such as a CPU, dedicated hardware such as an application-specific integrated circuit (ASIC) or a field programmable gate array (FPGA), which is specialized for analyzing magnetic domain structures, is used as the calculation unit 41. It's okay.
  • ASIC application-specific integrated circuit
  • FPGA field programmable gate array
  • FIGS. 3 and 4 show a case where the image acquisition device 30 and the analysis device 40 are separate devices, a system in which the image acquisition device 30 and the analysis device 40 are integrated may be adopted. .
  • FIG. 5 shows the configuration of the laser irradiation device 500.
  • the laser irradiation device 500 includes a polygon mirror 501, a light source device 503, a collimator 505, a condensing lens 507, a motor 509, a sensor 511, a control section 513, and a threading device 515.
  • the sheet threading device 515 threads the grain-oriented electrical steel sheet 50 in the rolling direction (RD).
  • the polygon mirror 501 has, for example, a regular polygonal column shape, and a plurality of plane mirrors are provided on each of the plurality of side surfaces forming the regular polygonal column.
  • a laser beam LB enters the plane mirror of the polygon mirror 501 in one direction (horizontal direction) from the light source device 503 via the collimator 505, and is reflected by the plane mirror.
  • the polygon mirror 501 can be rotated around the rotation axis O1 by driving from the motor 509. According to the rotation angle of the polygon mirror 501, the incident angle of the laser beam LB with respect to the plane mirror changes sequentially, so that the reflection direction of the laser beam LB changes sequentially, and the reflection direction of the laser beam LB sequentially changes along the magnetic domain control processing line 52 of the grain-oriented electrical steel sheet 50. Can be scanned.
  • the magnetic domain control processing lines 52 are a plurality of straight lines that form an angle of 0° to 45° with respect to the rolling direction (TD) and lined up in the rolling direction (RD) on the surface of the grain-oriented electrical steel sheet 50. be.
  • the plurality of magnetic domain control processing lines 52 extend parallel to each other.
  • the plurality of magnetic domain control processing lines 52 are arranged at equal intervals. The interval P between adjacent magnetic domain control processing lines 52 represents the irradiation pitch.
  • the light source device 503 outputs a laser beam LB in a predetermined irradiation method (for example, a continuous irradiation method or a pulse irradiation method) under the control of a control unit 513.
  • a predetermined irradiation method for example, a continuous irradiation method or a pulse irradiation method
  • the condensing lens 507 is provided in the optical path of the laser beam LB reflected from the polygon mirror 501, and constitutes a condensing optical system with a predetermined focal length.
  • the laser beam LB reflected from the polygon mirror 501 is focused on the surface of the grain-oriented electrical steel sheet 50 via the condenser lens 507, thereby forming grooves along the magnetic domain control processing lines 52 on the surface of the grain-oriented electrical steel sheet 50. is formed or thermal strain is introduced.
  • the motor 509 is connected to the polygon mirror 501 and rotates the polygon mirror 501 under the control of the control unit 513.
  • the sensor 511 is connected to the drive shaft of the motor 509, detects the rotation angle of the polygon mirror 501 rotated by the motor 509, and sends a signal indicating the detected rotation angle (hereinafter referred to as a rotation angle signal) to the control unit 513. Output to.
  • the control unit 513 includes a processor, and is connected to the light source device 503, the motor 509, the sensor 511, and the threading device 515.
  • the control unit 513 receives a speed signal from the sheet passing device 515 and outputs a signal instructing the motor 509 to rotate the polygon mirror 501 .
  • control unit 513 controls the magnetic domain refining signal that represents the location of the magnetic domain control processing line 52 to which the magnetic domain refining process is applied, and the rotation angle signal output from the sensor 511, which is output by the light source device 503. Controls the power on and off of the laser beam LB.
  • the magnetic domain refining signal is inputted from the analysis device 40 to the laser irradiation device 500. Note that the magnetic domain refining signal may be input to the laser irradiation device 500 by an operator.
  • the image acquisition device 30 acquires a magnetic domain image of the grain-oriented electrical steel sheet 50 (step S62).
  • the calculation unit 41 of the analysis device 40 derives a spatial distribution of 180° magnetic domain widths (magnetic domain widths) from the magnetic domain image, and determines which of the magnetic domain control processing lines 52 of the grain-oriented electrical steel sheet 50 have a magnetic domain width equal to or greater than a predetermined value. (for example, approximately 500 ⁇ m or more) is determined as a location to which the magnetic domain refining process is applied (step S64).
  • the part of the magnetic domain control processing line 52 to which the magnetic domain refining process is applied is referred to as a "magnetic domain refining process line.” Details of the process of step S64 executed by the calculation unit 41 will be described later.
  • step S64 the operator visually observes the magnetic domain image displayed on the display unit 45 to determine the location of the magnetic domain refining processing line, and generates a magnetic domain refining signal representing the location of the magnetic domain refining processing line. It may also be input to the laser irradiation device 500.
  • the magnetic domain refining process is performed preferentially on the locations determined in step S64 (step S66).
  • the magnetic domain refining process is performed only on the location determined in step S64.
  • the magnetic domain refining process in step S66 may be performed by irradiation with a laser beam LB by the laser irradiation device 500, or may employ other means such as irradiation with an electron beam.
  • step S64 executed by the calculation unit 41 of the analysis device 40 will be described.
  • the calculation unit 41 derives the spatial distribution of the magnetic domain width of the grain-oriented electrical steel sheet 50 using the line segment method or Fourier transform, and calculates the domain width of the magnetic domain control processing lines 52 of the grain-oriented electrical steel sheet 50 to a predetermined value (for example, a location larger than approximately 500 ⁇ m) is determined to be a location to which magnetic domain refining processing is applied.
  • ST2DFT short-term two-dimensional Fourier transform
  • the image (magnetic domain image) represented by the image signal acquired by the image acquisition device 30 is expressed as x (k, l) as a data string of two-dimensional coordinates (k-l coordinates).
  • the magnetic domain image to be analyzed is an image binarized using two types of colors, such as a gray scale, or an image expressed with three or more gradations (multi-gradation).
  • the calculation unit 41 executes the following steps (A-1), (A-2), and (A-3).
  • A-3) Step of deriving the spatial distribution of magnetic domain width Each step will be explained in detail below.
  • (A-1) Step of cutting out a plurality of partial regions from the magnetic domain image In order to cut out a plurality of partial regions from the magnetic domain image and analyze the frequency structure of each, the range in the k direction is set to 0 ⁇ k ⁇ N k ⁇ 1, A rectangular window function Wa (k, l) with a range in the l direction of 0 ⁇ l ⁇ N l ⁇ 1 is used (N k and N l are natural numbers).
  • the window function Wa(k,l) a Hamming window, a Hanning window, a Blackman window, etc. can be applied.
  • the observation position in the data string x (k, l) of the magnetic domain image is expressed as an index (n, m), and the shift amounts of the window function Wa (k, l) in the k direction and the l direction are expressed as S k and S, respectively.
  • l n, m, S k and S l are integers
  • nS k ⁇ k ⁇ nS k +N k -1
  • a data sequence x nm (k ⁇ nS k , l ⁇ mS l ) of the partial area cut out from the range of ⁇ 1 is obtained.
  • An example is shown in which partial areas corresponding to each are cut out.
  • N k and N l that define the range of the window function Wa(k, l) are parameters corresponding to the number of pixels in the k direction and the number of pixels in the l direction in the partial region, respectively.
  • f k and f l are spatial frequencies.
  • ⁇ f k and ⁇ f l are defined as in equation (3).
  • ⁇ k and ⁇ l are the spatial resolution in the k direction and the spatial resolution in the l direction, respectively, in the magnetic domain image.
  • Equation (4) the spatial distribution L(n, m) of the magnetic domain width is derived as shown in Equation (4).
  • the magnetic domain width is A location where the magnetic field is equal to or larger than a predetermined value (for example, about 500 ⁇ m or more) is determined as a magnetic domain refining processing line 90 (solid line in FIG. 9) to which the magnetic domain refining processing is applied.
  • the control unit 513 of the laser irradiation device 500 turns on the power of the laser beam LB for the magnetic domain subdivision processing line 90 among the magnetic domain control processing lines 52, and preferably turns off the power of the laser beam LB for other parts. control like this. As a result, a groove is formed along the magnetic domain refining processing line 90 or thermal strain is introduced.
  • predetermined value does not need to exactly match 500 ⁇ m.
  • the lower limit of the predetermined value may be 425 ⁇ m, 450 ⁇ m, or 475 ⁇ m.
  • the upper limit of the predetermined value may be 575 ⁇ m, 550 ⁇ m, or 525 ⁇ m.
  • the magnetic domain refining processing line 90 may be unclear. In this case, observation conditions may be adjusted so that the magnetic domain refining processing line 90 can be clearly confirmed.
  • the magnetic domain refining processing lines 90 can be made clear by applying a DC magnetic field along the direction perpendicular to the surface of the grain-oriented electrical steel sheet (thickness direction).
  • the grain-oriented electrical steel sheet 50 according to this embodiment has magnetic domain refining treatment lines 90, as illustrated in FIG.
  • the magnetic domain refining processing line 90 is a portion subjected to magnetic domain refining processing.
  • the magnetic domain refining processing line 90 is, for example, a groove, a thermal strain, or the like. When the magnetic domain refining processing line 90 is a groove, the magnetic domain refining processing line 90 can be easily recognized visually.
  • the magnetic domain refining processing line 90 is arranged on a line forming an angle of 0° to 45° with respect to the rolling direction (TD), that is, on the magnetic domain control processing line 52.
  • the magnetic domain control processing lines 52 are arranged along the rolling direction (RD) at an angle of 0° to 45° with respect to the rolling direction (TD) on the surface of the grain-oriented electrical steel sheet 50. It is preferable that the magnetic domain control processing lines 52 are arranged parallel to each other.
  • the magnetic domain control processing line 52 corresponds to the locus of the focal point of the laser beam LB during the manufacturing stage of the grain-oriented electrical steel sheet 50.
  • the magnetic domain control processing line 52 is It does not exist as a substance in the grain-oriented electrical steel sheet 50, but is an imaginary line along the magnetic domain refining processing line 90.
  • the magnetic domain control processing line 52 can be specified by drawing a line along the magnetic domain refining processing line 90 according to the above-described procedure.
  • the angle formed by the rolling direction (TD) and the extending direction of the magnetic domain refining line 90 is the angle between the rolling direction (TD) and the extending direction of the magnetic domain control line 52 on which the magnetic domain refining line 90 is provided. It is the same as the angle made by the direction.
  • the magnetic domain refining processing line 90 forms an angle of 0° to 45° with respect to the rolling direction (TD) of the grain-oriented electrical steel sheet 50. If the angle between the magnetic domain refining processing line 90 and the rolling direction (TD) is more than 45°, the effect of reducing iron loss cannot be obtained.
  • the angle between the magnetic domain refining processing line 90 and the rolling direction (TD) may be 1° or more, 5° or more, or 10° or more.
  • the angle between the magnetic domain refining processing line 90 and the rolling direction (TD) may be 40° or less, 30° or less, or 20° or less.
  • the angle between the magnetic domain control processing line 52 and the rolling direction (TD) may be uniform or may vary.
  • the angle between the magnetic domain control processing line 52 and the rolling direction (TD) may be set to 0° to 45° in only a part of the grain-oriented electrical steel sheet 50, or the magnetic domain control processing may be performed in all regions of the grain-oriented electrical steel sheet 50.
  • the angle between the line 52 and the rolling direction (TD) may be 0° to 45°.
  • the average value of the angle between the magnetic domain control processing lines 52 and the rolling direction (TD) in the grain-oriented electrical steel sheet 50 may be set to 0° to 45°.
  • the angle between the magnetic domain control processing line 52 and the rolling direction (TD), or its average value may be 1° or more, 3° or more, or 5° or more.
  • the angle between the magnetic domain control processing line 52 and the rolling direction (TD) or its average value may be 40° or less, 35° or less, or 30° or less.
  • the average magnetic domain width in the region of the magnetic domain control processing lines 52 where there is no magnetic domain refining processing line 90 and whose length is 1 mm or more is 500 ⁇ m or less. It is preferable that there be.
  • the region of the magnetic domain control processing line 52 without the magnetic domain refining processing line 90 is the region between the plurality of magnetic domain refining processing lines 90 on the same line.
  • the length of the region without the magnetic domain refining processing line 90 in the magnetic domain control processing line 52 is the interval between a plurality of magnetic domain refining processing lines 90 on the same line, and is measured along the magnetic domain refining processing line 90. It is a value.
  • a region of the magnetic domain control processing line 52 without the magnetic domain refining processing line 90 may be referred to as a non-magnetic domain refining processing line.
  • a non-magnetic domain refining processing line For example, in the grain-oriented electrical steel sheet 10 illustrated in FIG. , and the length is 1 mm or more.
  • the average magnetic domain width of the non-domain refining treated line with a length of 1 mm or more is 500 ⁇ m or less, since the iron loss of the grain-oriented electrical steel sheet 50 is further reduced.
  • the average magnetic domain width of the non-domain-refined line having a length of 1 mm or more is more preferably 480 ⁇ m or less, 450 ⁇ m or less, or 400 ⁇ m or less.
  • the magnetic domain refining treatment is suppressed to the minimum.
  • regions with a wide magnetic domain width and regions with a narrow magnetic domain width coexist.
  • the average magnetic domain in non-magnetic domain refining processing lines with a length of 1 mm or more among the magnetic domain control processing lines 52 is A grain-oriented electrical steel sheet 50 having a width of 500 ⁇ m or less is obtained.
  • a grain-oriented electrical steel sheet 50 it is possible to appropriately avoid the magnetic domain refining process to a region with a narrow magnetic domain width, which has little iron loss reduction effect, and it is possible to reduce the generation of return magnetic domains caused by the magnetic domain refining process. This makes it possible to further suppress noise.
  • the region without the magnetic domain refining processing line 90 in the magnetic domain control processing line 52 is the region between the plurality of magnetic domain refining processing lines 90 on the same line, and is the non-magnetic domain refining processing line mentioned above. .
  • the average magnetic domain width in the non-domain refining treated line containing two or more domain walls 502 is 500 ⁇ m or less, since the core loss of the grain-oriented electrical steel sheet 50 is further reduced.
  • the grain-oriented electrical steel sheet 50 in which the average magnetic domain width in the non-domain refining process line containing two or more domain walls 502 is 500 ⁇ m or less is used in regions where the original magnetic domain width of the grain-oriented electrical steel sheet is wide (for example, in regions of approximately 500 ⁇ m or more). ) is obtained by performing magnetic domain control such that magnetic domain refining processing is performed preferentially on the magnetic domain.
  • the average magnetic domain width in a non-domain refining process line that includes two or more domain walls 502 is 500 ⁇ m or less, it is possible to appropriately avoid the magnetic domain refining process to a region with a narrow magnetic domain width that has little iron loss reduction effect. Since it is possible to reduce the generation of reflux magnetic domains caused by the magnetic domain refining process, the noise of the grain-oriented electrical steel sheet 50 is further suppressed.
  • the average magnetic domain width in the area where the magnetic domain refining processing line 90 is present is not particularly limited.
  • the average magnetic domain width in the area where the magnetic domain refining processing line 90 is located may be defined as, for example, 500 ⁇ m or less, 480 ⁇ m or less, 450 ⁇ m or less, or 400 ⁇ m or less.
  • the proportion of the magnetic domain refining processing lines 90 in the magnetic domain control processing lines 52 is defined as the ratio of the length of the magnetic domain refining processing lines 90 to the total length of the magnetic domain control processing lines 52. , preferably 10% or more and 90% or less.
  • the ratio of the magnetic domain refining processing lines 90 to the total length of the magnetic domain control processing lines 52 is 10% or more, because if it is less than 10%, it is difficult to obtain the magnetic domain refining effect.
  • 90% or less is preferable is that if it exceeds 90%, it is not desirable in terms of noise reduction.
  • the proportion of the magnetic domain refining processing lines 90 in the magnetic domain control processing lines 52 be as small as possible.
  • the average magnetic domain width of non-magnetic domain refining processed lines with a length of 1 mm or more is set to 500 ⁇ m or less, or the average magnetic domain width of non-magnetic domain subdivided processed lines containing two or more domain walls 502 is set to 500 ⁇ m or less.
  • the ratio of the magnetic domain refining processing lines 90 to the total length of the magnetic domain control processing lines 52 is preferably 15% or more, 20% or more, or 30% or more.
  • the ratio of the magnetic domain refining processing lines 90 to the total length of the magnetic domain control processing lines 52 is preferably 80% or less, 70% or less, or 60% or less.
  • the magnetic domain refining processing line 90 exists on the magnetic domain control processing line 52 in a non-single period.
  • the existence of the magnetic domain refining processing line 90 on the magnetic domain control processing line 52 in a non-single period means that there are 10 or more magnetic domain refining processing lines 90 on average per 1 cm, and each magnetic domain subdivision This means that the case where the standard deviation of the length of the non-magnetic domain refining lines between the polarized lines 90 is 20 ⁇ m or less does not apply. That is, in this embodiment, the magnetic domain refining processing lines 90 obtained by performing magnetic domain control over the entire surface of the steel plate using a normal pulsed laser are considered not to "exist in a non-single period.”
  • the measurements of both parameters are performed on a sample of a predetermined size taken from the grain-oriented electrical steel sheet 50.
  • a rectangular sample with lengths on both sides of 100 mm (or 100 mm or more) can be cut out from the grain-oriented electrical steel sheet 50 and used for measurement.
  • the grain-oriented electrical steel sheet 50 is a coil
  • a sample may be taken from any location of the coil.
  • the grain-oriented electrical steel sheet 50 is a component incorporated into an electrical appliance such as a transformer or a motor, a sample may be taken from any location of the component.
  • the length of one side of the sample may be less than 100 mm.
  • the total sample area should be 10,000 mm 2 or more. At this time, it is desirable to collect the sample by a method such as wire cutting in order to minimize the influence of mechanical distortion on the sample.
  • the magnetic domain refining processing line 90 included in the sample is identified.
  • the magnetic domain refining processing line 90 has a visible form such as a groove, no special processing is necessary for the magnetic domain refining processing line 90.
  • a magnetic domain image is photographed using an image acquisition device as illustrated in FIG. 3, for example. If necessary, a magnetic domain image is taken while applying a DC magnetic field along the direction perpendicular to the surface of the grain-oriented electrical steel sheet 50 (thickness direction). By observing the magnetic domain image, the position of the magnetic domain refining processing line 90 can be specified.
  • the rolling direction (TD) is specified.
  • the width direction of the grain-oriented electrical steel sheet 50 can be considered to be the rolling direction (TD).
  • the rolling direction (TD) is determined from the rolling flaws on the surface of the grain-oriented electrical steel sheet 50.
  • the extending direction of rolling flaws is regarded as the rolling direction (RD), and the direction perpendicular to the rolling direction (RD) and parallel to the steel sheet surface is regarded as the rolling direction (TD).
  • the rolling direction (TD) is determined from the crystal orientation of the grain-oriented electrical steel sheet 50. Specifically, the crystal orientation of the grain-oriented electrical steel sheet 50 to be evaluated is measured at multiple points. Then, the direction in which the deviation angle from the GOSS orientation at the measurement point is the minimum is regarded as the rolling direction (RD), and the direction perpendicular to the rolling direction (RD) and parallel to the surface of the grain-oriented electrical steel sheet 50 is set at the rolling right angle. direction (TD). In either case, from the viewpoint of ease of measurement, it is preferable to cut out the sample from the grain-oriented electrical steel sheet 50 so that one side of the sample coincides with the rolling direction (TD).
  • the magnetic domain control processing line 52 does not exist as a substance in the grain-oriented electrical steel sheet 50, but is an imaginary line along the magnetic domain refining processing line 90. Therefore, the narrow angle formed by the magnetic domain refining processing line 90 specified in the above procedure and the rolling direction (TD) is considered to be the angle formed by the magnetic domain control processing line 52 and the rolling direction (TD). I can do it.
  • the method for measuring the average magnetic domain width of non-domain subdivided lines having a length of 1 mm or more is as follows.
  • FIG. 10 shows an example of a magnetic domain image.
  • magnetic domains 501A and 501B have a band shape.
  • adjacent magnetic domains are shown in different colors in FIG. 10. That is, for convenience of explanation, the magnetic domain 501A is hatched, and the magnetic domain 501B adjacent to the magnetic domain 501A is not hatched.
  • the boundary between two adjacent magnetic domains 501A and 501B is a domain wall 502.
  • a virtual line along the magnetic domain refining processing line 90 included in the magnetic domain image is assumed.
  • This virtual line corresponds to the magnetic domain control processing line 52.
  • the length of a portion of the virtual line where the magnetic domain refining processing line 90 does not exist (hereinafter referred to as a "non-magnetic domain refining processing line") is measured.
  • the length of the non-magnetic domain refining processing line means the length along the virtual line, that is, the magnetic domain refining processing line 90.
  • the non-magnetic domain refining line labeled 100A has a length of 1 mm or more, so it is extracted.
  • the non-magnetic domain refining processing lines labeled 100B and 100C are not extracted because their lengths are less than 1 mm.
  • the total number of magnetic domains 501A and 501B included in all non-magnetic domain refining lines having a length of 1 mm or more is counted.
  • the number of magnetic domains included in the non-magnetic domain refining line labeled 100A is four.
  • the magnetic domain Among the control processing lines 52 the average magnetic domain width of non-domain subdivision processing lines with a length of 1 mm or more is calculated.
  • the method for measuring the average magnetic domain width in a non-domain subdivided line containing two or more domain walls 502 is as follows.
  • FIG. 10 shows an example of a magnetic domain image.
  • the boundary between adjacent magnetic domains 501A and 501B is a domain wall 502.
  • non-magnetic domain refining processing line a virtual line along the magnetic domain refining processing line 90 included in the magnetic domain image. This virtual line corresponds to the magnetic domain control processing line 52. Then, the number of domain walls 502 included in a portion of the virtual line where the magnetic domain refining processing line 90 does not exist (hereinafter referred to as "non-magnetic domain refining processing line") is counted. As a result, all non-magnetic domain refining lines containing two or more domain walls 502 included in the sample are extracted. For example, the non-magnetic domain refining processing line labeled 100A is extracted because the number of domain walls 502 included therein is three.
  • the non-magnetic domain refining processing line labeled 100B is not extracted because the number of domain walls 502 included therein is one.
  • the non-magnetic domain refining processing line labeled 100C is extracted because the number of domain walls 502 included therein is two.
  • the total number of magnetic domains 501A and 501B included in all non-domain subdivision processing lines containing two or more domain walls 502 is counted.
  • the number of magnetic domains 501A and 501B included in the non-domain subdivision processing line labeled 100A is four.
  • the number of magnetic domains 501A and 501B included in the non-magnetic domain refining line labeled 100C is three.
  • the domain wall By dividing the total length of all the non-magnetic domain subdivided lines containing two or more domain walls 502 in the sample by the total number of magnetic domains 501A and 501B included in the non-magnetic domain subdivided lines, the domain wall The average magnetic domain width in the non-magnetic domain refining processing line containing two or more 502 is calculated.
  • the method for measuring the ratio of the magnetic domain refining processing lines 90 to the total length of the magnetic domain control processing lines 52 is as follows. First, the magnetic domain control processing line 52 and the magnetic domain refining processing line 90 included in the sample are identified by the above-described procedure. Next, the total length of all the magnetic domain control processing lines 52 included in the sample and the total length of all the magnetic domain refining processing lines 90 included in the sample are calculated. Then, by dividing the total length of all the magnetic domain refining processed lines 90 included in the sample by the total length of all the magnetic domain control processed lines 52 included in the sample, the magnetic domain control processed lines 52 are divided. The ratio of the magnetic domain subdivision processing line 90 to the total length is calculated.
  • the method for determining whether or not the magnetic domain refining processing line 90 exists in a non-single period is as follows. First, the magnetic domain control processing line 52 and the magnetic domain refining processing line 90 included in the sample are identified by the above-described procedure. As mentioned above, the existence of magnetic domain refining lines 90 in a non-single period means that there are 10 or more magnetic domain refining lines 90 on average per 1 cm, and between each magnetic domain refining line 90. This means that the case where the standard deviation of the length of the non-magnetic domain refining line in 20 ⁇ m or less does not apply.
  • magnetic domain refining processing lines 90 are included at an average of 10 or more locations per 1 cm. Determine whether or not. For example, if the length of one magnetic domain control processing line 52 included in the sample is X cm, and the number of magnetic domain refining processing lines 90 included in the magnetic domain control processing line 52 is y, then the magnetic domain control It is determined that the processed line 52 has an average of y/X magnetic domain refining processed lines 90 per 1 cm.
  • each of the magnetic domain control processing lines 52 that are determined to contain on average 10 or more magnetic domain subdivision processing lines 90 per cm is the standard deviation of the length of the non-magnetic domain subdivision processing lines 20 ⁇ m or less? Determine whether or not. If the magnetic domain refining processing lines 90 are provided in a non-single period in 50% or more of all the magnetic domain control processing lines 52 included in the sample, the magnetic domain refining processing lines 90 are provided in a non-single period in the sample. It is determined that it exists periodically.
  • the evaluation method for noise and iron loss was as follows. First, a three-phase transformer core was created by laminating 180 grain-oriented electrical steel sheets each having a thickness of 0.23 mm. The widths of the legs and yoke of the three-phase transformer core were both 150 mm. The height and width of the three-phase transformer core were both 750 mm. The noise and iron loss of these three-phase transformer cores were measured. The measurement conditions were a frequency of 50 Hz and an excitation magnetic flux density of 1.7 T.
  • noise evaluation results (unit: dBA) of grain-oriented electrical steel sheets.
  • the iron loss was determined by measuring the voltage and current on the primary and secondary sides with a power analyzer when excitation was performed at a frequency of 50 Hz and an excitation magnetic flux density of 1.7 T as described above.
  • the obtained iron loss is listed in Table 2 as the iron loss evaluation result (unit: W/kg) of grain-oriented electrical steel sheets.
  • An example in which the iron loss evaluation result was 1.00 W/kg or less was determined to be an example in which low iron loss was achieved. Noise evaluation results that were determined to fail are underlined.
  • the average magnetic domain width measured in an area with a length of 1 mm or more in a portion without a magnetic domain refining treatment line, and the portion without a magnetic domain refining treatment line was measured and listed in Table 2.
  • the method for measuring the average magnetic domain width was as described above. A rectangular sample with a length of 100 mm on both sides was cut out from the core of a three-phase transformer for measuring noise and iron loss, and was used for measurement.
  • Example 1 magnetic domain refining processing was not performed. In Example 1, no stress introduction line was provided, so no deterioration of the noise evaluation results was observed. On the other hand, in Example 1, low iron loss was not achieved.
  • Example of inappropriate angle In Examples 2 to 5, the angle between the magnetic domain control processing line and the direction perpendicular to rolling was excessive. In these examples, iron loss exceeded 1.00 W/kg and noise exceeded 33.5 dBA. That is, in Examples 2 to 5, despite the magnetic domain control processing being performed, little iron loss reduction effect was obtained and noise also increased.
  • Example 6 the angle between the magnetic domain control processing line and the direction perpendicular to rolling was appropriate.
  • the iron loss was lower than 1.00 W/kg, and the noise was 33.5 dBA or less.
  • Example 11 to 15, Example 23, and Example 25 the angle between the magnetic domain control processing line and the direction perpendicular to the rolling direction was appropriate.
  • the iron loss was 1.00 W/kg or less, and the noise was also 33.5 dBA or less. That is, by providing the magnetic domain control processing lines at appropriate angles, it was possible to obtain the effect of reducing iron loss without significantly increasing noise.
  • Example 11 since the magnetic domain refining process was performed in a non-single period, the noise tended to be suppressed more than in Examples 6 to 10.
  • Example 7 in which the magnetic domain refining process was performed with a constant pulse
  • Example 11 in which the magnetic domain refining process was performed in a non-single cycle
  • the angle formed by the magnetic domain control process line and the rolling direction TD the angle formed by the magnetic domain control process line and the rolling direction TD
  • the ratio of the magnetic domain refining treatment lines to the total length of the magnetic domain control treatment lines was the same between Example 7 and Example 11.
  • Example 11 was superior to Example 7.
  • Example 16 to 22, 24, and 26 to 28 the angle between the magnetic domain control treatment line and the direction perpendicular to the rolling direction is appropriate, and the magnetic domain control treatment is performed by selecting locations where the magnetic domain width is 500 ⁇ m or more. Ta. As a result, in Examples 16 to 22, 24, and 26 to 28, a higher iron loss reduction effect than in Examples 6 to 15, 23, and 25 could be obtained.
  • Example 16 to 22, 24, and 26 to 28 the noise tended to be more suppressed than in Examples 6 to 15, 23, and 25.
  • Example 23 in which the magnetic domain refining process was performed in a non-single cycle
  • Example 24 in which the magnetic domain refining process was performed selectively at a location where the magnetic domain width is 500 ⁇ m or more
  • the magnetic domain control process line and the rolling The angle formed by the perpendicular direction TD and the ratio of the magnetic domain refining processing lines to the total length of the magnetic domain control processing lines were substantially the same between Examples 23 and 24.
  • Example 24 was superior to Example 23.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnetism (AREA)
  • Dispersion Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
PCT/JP2023/012197 2022-03-28 2023-03-27 方向性電磁鋼板及びその製造方法 Ceased WO2023190339A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
KR1020247031412A KR20240155269A (ko) 2022-03-28 2023-03-27 방향성 전자 강판 및 그 제조 방법
EP23780349.9A EP4502190A4 (en) 2022-03-28 2023-03-27 GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET AND PROCESS FOR PRODUCING THE SAME
US18/832,012 US20250115974A1 (en) 2022-03-28 2023-03-27 Grain-oriented electrical steel sheet and manufacturing method therefor
CN202380021593.7A CN118696141A (zh) 2022-03-28 2023-03-27 方向性电磁钢板及其制造方法
JP2024512459A JPWO2023190339A1 (https=) 2022-03-28 2023-03-27

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-052343 2022-03-28
JP2022052343 2022-03-28

Publications (1)

Publication Number Publication Date
WO2023190339A1 true WO2023190339A1 (ja) 2023-10-05

Family

ID=88202366

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/012197 Ceased WO2023190339A1 (ja) 2022-03-28 2023-03-27 方向性電磁鋼板及びその製造方法

Country Status (6)

Country Link
US (1) US20250115974A1 (https=)
EP (1) EP4502190A4 (https=)
JP (1) JPWO2023190339A1 (https=)
KR (1) KR20240155269A (https=)
CN (1) CN118696141A (https=)
WO (1) WO2023190339A1 (https=)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025070793A1 (ja) * 2023-09-27 2025-04-03 日本製鉄株式会社 方向性電磁鋼板及びその製造方法
WO2026023445A1 (ja) * 2024-07-25 2026-01-29 日本製鉄株式会社 加工装置、磁区細分化加工システム、加工方法、及びプログラム
JP7817670B1 (ja) * 2024-07-25 2026-02-19 日本製鉄株式会社 磁区情報取得装置、磁区情報取得システム、磁区情報取得方法、及びプログラム

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55119125A (en) * 1979-03-05 1980-09-12 Nippon Steel Corp Manufacture of low iron loss one-directional silicon steel plate
JPH11293340A (ja) * 1998-04-08 1999-10-26 Kawasaki Steel Corp 低鉄損方向性電磁鋼板及びその製造方法
JP2008127632A (ja) * 2006-11-21 2008-06-05 Nippon Steel Corp 低鉄損一方向性電磁鋼板
JP2012012664A (ja) 2010-06-30 2012-01-19 Jfe Steel Corp 方向性電磁鋼板の製造方法
JP2012057219A (ja) 2010-09-09 2012-03-22 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
JP2012057218A (ja) 2010-09-09 2012-03-22 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
CN106282512A (zh) * 2015-05-11 2017-01-04 宝山钢铁股份有限公司 低噪音变压器用取向硅钢片制造方法
JP2020169373A (ja) * 2019-04-05 2020-10-15 日本製鉄株式会社 方向性電磁鋼板
JP2022052343A (ja) 2020-09-23 2022-04-04 ファナック株式会社 ハンドシステム及びハンドプログラム

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55119125A (en) * 1979-03-05 1980-09-12 Nippon Steel Corp Manufacture of low iron loss one-directional silicon steel plate
JPH11293340A (ja) * 1998-04-08 1999-10-26 Kawasaki Steel Corp 低鉄損方向性電磁鋼板及びその製造方法
JP2008127632A (ja) * 2006-11-21 2008-06-05 Nippon Steel Corp 低鉄損一方向性電磁鋼板
JP2012012664A (ja) 2010-06-30 2012-01-19 Jfe Steel Corp 方向性電磁鋼板の製造方法
JP2012057219A (ja) 2010-09-09 2012-03-22 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
JP2012057218A (ja) 2010-09-09 2012-03-22 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
CN106282512A (zh) * 2015-05-11 2017-01-04 宝山钢铁股份有限公司 低噪音变压器用取向硅钢片制造方法
JP2020169373A (ja) * 2019-04-05 2020-10-15 日本製鉄株式会社 方向性電磁鋼板
JP2022052343A (ja) 2020-09-23 2022-04-04 ファナック株式会社 ハンドシステム及びハンドプログラム

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4502190A4

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025070793A1 (ja) * 2023-09-27 2025-04-03 日本製鉄株式会社 方向性電磁鋼板及びその製造方法
WO2026023445A1 (ja) * 2024-07-25 2026-01-29 日本製鉄株式会社 加工装置、磁区細分化加工システム、加工方法、及びプログラム
JP7817670B1 (ja) * 2024-07-25 2026-02-19 日本製鉄株式会社 磁区情報取得装置、磁区情報取得システム、磁区情報取得方法、及びプログラム

Also Published As

Publication number Publication date
US20250115974A1 (en) 2025-04-10
EP4502190A1 (en) 2025-02-05
CN118696141A (zh) 2024-09-24
KR20240155269A (ko) 2024-10-28
EP4502190A4 (en) 2025-07-16
JPWO2023190339A1 (https=) 2023-10-05

Similar Documents

Publication Publication Date Title
WO2023190339A1 (ja) 方向性電磁鋼板及びその製造方法
US20250118469A1 (en) Grain-oriented electrical steel sheet and manufacturing method therefor
JP6620566B2 (ja) 方向性電磁鋼板、方向性電磁鋼板の製造方法、変圧器またはリアクトル用の鉄心、および、騒音評価方法
JP7457239B2 (ja) 磁区構造の解析方法及び解析システム
KR102871723B1 (ko) 방향성 전자 강판 및 그 제조 방법
WO2025070780A1 (ja) 方向性電磁鋼板、及び方向性電磁鋼板の製造方法
RU2846912C2 (ru) Лист электротехнической стали с ориентированной зеренной структурой и способ его изготовления
RU2841654C2 (ru) Лист электротехнической стали с ориентированной зеренной структурой и способ его изготовления
RU2840516C2 (ru) Лист электротехнической стали с ориентированной зеренной структурой и способ его изготовления
WO2025070785A1 (ja) 方向性電磁鋼板
JP7817657B2 (ja) 方向性電磁鋼板及びその製造方法
JP7836023B2 (ja) 方向性電磁鋼板及びその製造方法
KR20260057131A (ko) 방향성 전자 강판, 및 방향성 전자 강판의 제조 방법
WO2025070790A1 (ja) 方向性電磁鋼板、及び方向性電磁鋼板の製造方法
WO2025070781A1 (ja) 方向性電磁鋼板、及び方向性電磁鋼板の製造方法
WO2025070793A1 (ja) 方向性電磁鋼板及びその製造方法
KR20260057118A (ko) 방향성 전자 강판 및 방향성 전자 강판의 제조 방법
WO2025070786A1 (ja) 方向性電磁鋼板及びその製造方法
WO2025070776A1 (ja) 方向性電磁鋼板、及び方向性電磁鋼板の製造方法
KR20260057208A (ko) 방향성 전자 강판, 및 방향성 전자 강판의 제조 방법
KR20260057129A (ko) 방향성 전자 강판 및 그 제조 방법
KR20260057212A (ko) 방향성 전자 강판 및 그 제조 방법

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23780349

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2024512459

Country of ref document: JP

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112024012777

Country of ref document: BR

WWE Wipo information: entry into national phase

Ref document number: 202417052452

Country of ref document: IN

WWE Wipo information: entry into national phase

Ref document number: 18832012

Country of ref document: US

WWE Wipo information: entry into national phase

Ref document number: 202380021593.7

Country of ref document: CN

ENP Entry into the national phase

Ref document number: 20247031412

Country of ref document: KR

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 1020247031412

Country of ref document: KR

ENP Entry into the national phase

Ref document number: 112024012777

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20240621

WWE Wipo information: entry into national phase

Ref document number: 2024120930

Country of ref document: RU

Ref document number: 2023780349

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2023780349

Country of ref document: EP

Effective date: 20241028

WWP Wipo information: published in national office

Ref document number: 18832012

Country of ref document: US

WWG Wipo information: grant in national office

Ref document number: 2024120930

Country of ref document: RU