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

Abstract

The grain-oriented electrical steel sheet has a magnetic domain control processing line on the surface, and satisfies [beta] All-[beta] Dr > = 0.1 DEG, [beta] All being the average value of the absolute values of [beta] angles throughout the entire surface of the grain-oriented electrical steel sheet, and [beta] Dr being the absolute value of [beta] angles throughout the entire surface of the grain-oriented electrical steel sheet. [beta] Dr is the average value of the absolute values of [beta] angles at magnetic domain control points, which are the intersections between a plurality of imaginary lines set parallel to the rolling direction of the grain-oriented electrical steel sheet at intervals of 2 mm and the magnetic domain control processing line. This method for producing a grain-oriented electrical steel sheet is provided with: a step for acquiring a magnetic domain image of a raw sheet of a grain-oriented electrical steel sheet; a step for determining a magnetic domain control processing region on the basis of the distribution of magnetic domain widths in the magnetic domain image; and a step for applying a magnetic domain control process to a magnetic domain control process region determined on the basis of the distribution of the magnetic domain widths.

Description

Technical Field

[0001] This disclosure relates to oriented electromagnetic steel sheets and methods for manufacturing oriented electromagnetic steel sheets.

[0002] This application claims priority based on Japanese Patent Application No. 2023-166060, filed in Japan on September 27, 2023, the contents of which are incorporated herein by reference. Background Technology

[0003] Oriented electromagnetic steel sheets contain less than 7% by mass of Si and have secondary recrystallized grains along the easily magnetized axis. <001> {110} oriented in the rolling direction <001> Oriented (Goss orientation) steel sheets with a secondary recrystallization texture. Oriented electromagnetic steel sheets are mainly used as the cores of power transformers. For oriented electromagnetic steel sheets, it is required to reduce energy loss (iron loss).

[0004] To reduce iron loss, techniques for narrowing the domain width of oriented electromagnetic steel sheets (domain subdivision technology based on domain control processing) are previously known. Domain width can be narrowed by inducing thermal strain by irradiating the surface of the oriented electromagnetic steel sheet with a laser or electron beam in a direction intersecting the rolling direction. Alternatively, domain width can also be narrowed by forming grooves on the surface of the oriented electromagnetic steel sheet in a direction intersecting the rolling direction. Methods for forming these grooves include laser or electron beam irradiation, mechanical processing methods such as gear machining, and chemical processing methods such as etching.

[0005] In recent years, in order to provide oriented electromagnetic steel sheets with good iron loss characteristics, various improvement technologies related to magnetic domain subdivision have been proposed (for example, see Patent Documents 1 to 3).

[0006] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2012-57219 Patent Document 2: Japanese Patent Application Publication No. 2012-12664 Patent Document 3: Japanese Patent Application Publication No. 2012-57218 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] When magnetic domain control is applied to oriented electromagnetic steel sheets, the magnetostrictive properties of the sheets change due to the closed magnetic domains. This deteriorates the noise characteristics of the oriented electromagnetic steel sheets. Noise characteristics refer to the level of noise generated by electrical products (such as transformers and motors) manufactured using oriented electromagnetic steel sheets as materials. Magnetostriction refers to the phenomenon of slight deformation of the shape when a strongly magnetic material is magnetized. When oriented electromagnetic steel sheets are excited using alternating current, the magnitude of magnetostriction changes with the intensity of magnetization, thereby generating vibration. The magnitude of this magnetostriction is 10. -6 Although the magnetostriction of the iron core is very small, it causes the core to vibrate, which propagates to external structures such as the transformer tank and becomes noise.

[0009] In other words, while magnetic domain control is effective in suppressing iron losses in oriented electromagnetic steel sheets, it also deteriorates their noise characteristics. In recent years, there has been a growing demand for both low iron losses and low noise levels in oriented electromagnetic steel sheets. However, to date, no magnetic domain subdivision technology has been proposed that can achieve both low noise and low iron losses.

[0010] The purpose of this disclosure is to provide an orientation-oriented electromagnetic steel sheet that achieves both low iron loss and low noise, and a method for manufacturing the same.

[0011] means for solving problems

[0012] The main purpose of this disclosure is as follows.

[0013] (1) One embodiment of the present disclosure is an orientation-oriented electromagnetic steel sheet with magnetic domain control processing lines on its surface, satisfying |β All |-|β Dr |≥0.1°,|β All | is the average absolute value of the β angle across the entire surface of the aforementioned oriented electromagnetic steel sheet, |β Dr | is the average value of the absolute value of the angle β at the intersection point of multiple imaginary lines set at 2mm intervals parallel to the rolling direction of the above-mentioned oriented electromagnetic steel sheet and the above-mentioned domain control processing line, i.e., the domain control point.

[0014] (2) Preferably, the orientation-oriented electromagnetic steel plate described in (1) above satisfies |β All |-|β Dr |≥0.2°.

[0015] (3) Preferably, the orientation-oriented electromagnetic steel plate described in (1) above satisfies |β All |-|β Dr |≥0.5°.

[0016] (4) Preferably, the orientation-oriented electromagnetic steel plate described in (1) above satisfies |βAll |-|β Dr |≥1.0°.

[0017] (5) Preferably, the orientation electromagnetic steel sheet of any one of (1) to (4) above satisfies |β All |-|β Dr |>σ All / 2,σ All It is the standard deviation of the absolute value of the angle β, which is the entirety of the surface of the aforementioned oriented electromagnetic steel sheet.

[0018] (6) Preferably, the orientation electromagnetic steel sheet described in any one of (1) to (5) above satisfies σ Dr <σ All , σ All It is the standard deviation of the absolute value of the angle β, which is the entirety of the surface of the aforementioned oriented electromagnetic steel sheet. Dr It is the standard deviation of the absolute value of the β angle at the aforementioned domain control point.

[0019] (7) Preferably, in any one of (1) to (6) above, the magnetic domain control processing line is thermal strain.

[0020] (8) Preferably, in any one of (1) to (7) above, the magnetic domain control processing line is a groove.

[0021] (9) Preferably, in the oriented electromagnetic steel sheet described in (7) above, the maximum value of the tensile strength introduced by the thermal strain in the magnetic domain control processing line is not uniform at each of the tensile strength measurement points.

[0022] (10) Preferably, in the orientation electromagnetic steel sheet described in (9) above, σ satisfies 2 (TS) m >5.0, TS m The tensile strength, measured in MPa, at multiple magnetic domain control points and incorporating the aforementioned thermal strain, is σ. 2 (TS) m ) is TS m The variance.

[0023] (11) Preferably, in the orientation electromagnetic steel sheet described in (9) or (10) above, the TS requirement is met. m（β<βDr） >TS m（β≥βDr） TS m（β<βDr） In the above-mentioned magnetic domain processing points, the β angle is less than β DrThe arithmetic mean of the maximum tensile strength (in MPa) measured at the aforementioned magnetic domain treatment points and introduced into the aforementioned thermal strain, TS m（β≥βDr） When the angle β is β Dr The arithmetic mean of the maximum values ​​of the tensile strength measured at the above-mentioned magnetic domain treatment points and the tensile strength measured in MPa under the above-mentioned thermal strain.

[0024] (12) Preferably, in the orientation electromagnetic steel plate described in (8) above, the maximum value of the depth of the groove in the magnetic domain control processing line is not uniform at each measurement point of the groove.

[0025] (13) Preferably, in the orientation-oriented electromagnetic steel sheet described in (12) above, σ satisfies 2 (D) m >3.0, D m It is the maximum value of the depth of the aforementioned groove in μm at the aforementioned domain control point, σ 2 (D) m ) is D m The variance.

[0026] (14) Preferably, in the orientation-oriented electromagnetic steel sheet described in (12) or (13) above, D satisfies m（β<βDr） >D m（β≥βDr） D m（β<βDr） In the above-mentioned domain control points, angle β is less than β Dr The arithmetic mean of the maximum values ​​of the depths of the aforementioned grooves, measured in μm, at the aforementioned domain control points, is D. m（β≥βDr） When the angle β is β Dr The arithmetic mean of the maximum values ​​of the depths of the aforementioned grooves, measured in μm, at the aforementioned magnetic domain control points.

[0027] (15) Another aspect of the present disclosure provides a method for manufacturing an orientation-oriented electromagnetic steel sheet, comprising: a step of obtaining a magnetic domain image of a raw material of the orientation-oriented electromagnetic steel sheet; a step of determining a magnetic domain control processing region based on the distribution of magnetic domain widths in the magnetic domain image; and a step of applying magnetic domain control processing to the magnetic domain control processing region determined based on the distribution of magnetic domain widths; wherein in the orientation-oriented electromagnetic steel sheet to which the magnetic domain control processing has been applied, |β All |-|β Dr |≥0.1°,|β All | is the average absolute value of the β angle across the entire surface of the orientation electromagnetic steel sheet to which the above-mentioned magnetic domain control treatment has been applied, |β Dr| is the average value of the absolute value of the angle β at the intersection point of multiple imaginary lines set at 2mm intervals parallel to the rolling direction of the above-mentioned oriented electromagnetic steel sheet that has undergone the above-mentioned magnetic domain control treatment and the magnetic domain control treatment line formed by the above-mentioned magnetic domain control treatment, i.e., the magnetic domain control point.

[0028] (16) Preferably, in the method for manufacturing the oriented electromagnetic steel sheet described in (15) above, the region where the magnetic domain width is above a predetermined value is set as the magnetic domain control processing region.

[0029] (17) Preferably, in the method for manufacturing the oriented electromagnetic steel sheet described in (15) or (16) above, a two-dimensional Fourier transform is used to derive the distribution of the magnetic domain width from the magnetic domain image.

[0030] (18) Preferably, in the manufacturing method of the oriented electromagnetic steel sheet described in (15) or (16) above, the above-mentioned magnetic domain control process is applied by irradiation with a laser or electron beam.

[0031] (19) Preferably, in the manufacturing method of the oriented electromagnetic steel sheet described in (15) above, the magnetic domain control intensity is made uneven in the process of applying magnetic domain control treatment to the magnetic domain control treatment area.

[0032] Invention Effects

[0033] According to this disclosure, it is possible to provide an orientation-oriented electromagnetic steel sheet that achieves both low iron loss and low noise, and a method for manufacturing the same. Attached Figure Description

[0034] Figure 1 This is a top view of an orientation-type electromagnetic steel sheet according to one embodiment of the present disclosure.

[0035] Figure 2 This is a top view of a typical oriented electromagnetic steel sheet.

[0036] Figure 3 It is a graph showing the relationship between the β angle and the domain width.

[0037] Figure 4A This is a chart illustrating an example of the distribution of magnetic domain widths in an orientation-controlled electromagnet sheet before magnetic domain control treatment.

[0038] Figure 4B This is a chart illustrating an example of the distribution of magnetic domain widths in a oriented electromagnetic steel sheet after domain control treatment.

[0039] Figure 4C It means Figure 4A and Figure 4B A graph of the differences.

[0040] Figure 5 This is a graph showing the relationship between the domain width before and after domain control processing.

[0041] Figure 6 This is a block diagram illustrating an example of the hardware configuration of an image acquisition device.

[0042] Figure 7 This is a block diagram illustrating an example of the hardware configuration of a parsing device.

[0043] Figure 8 This is a schematic diagram illustrating an example of the configuration of a laser irradiation device.

[0044] Figure 9 This is a flowchart illustrating a method for manufacturing an orientation-oriented electromagnetic steel sheet according to one embodiment of the present disclosure.

[0045] Figure 10 This is a schematic diagram illustrating a method for cutting out multiple partial regions from a magnetic domain image of a oriented electromagnetic steel sheet.

[0046] Figure 11 This is an example of obtaining multiple partial Fourier images by performing two-dimensional Fourier transforms on multiple partial regions cut out from the magnetic domain image of the oriented electromagnetic steel plate.

[0047] Figure 12 This is a top view of the original sheet of oriented electromagnetic steel.

[0048] Figure 13 It is in |β All |Illustrative diagram of the imaginary lines VL1 and VL2 set during the calculation.

[0049] Figure 14 This is a top view of an orientation-type electromagnetic steel sheet according to one embodiment of the present disclosure.

[0050] Figure 15 It is a graph that schematically illustrates the relationship between the size of the domain width and the domain-controlled saturation intensity.

[0051] Figure 16 This is a graph that schematically illustrates the relationship between the size of the β angle and the domain-controlled saturation intensity.

[0052] Figure 17 This is a schematic diagram of a cross-section of an orientation-type electromagnetic steel sheet with thermal strain as the magnetic domain control processing line.

[0053] Figure 18 This is a schematic diagram of the cross-section of an orientation-oriented electromagnetic steel plate with grooves formed by magnetic domain control processing lines.

[0054] Figure 19This is a top-view schematic diagram illustrating the method for measuring the magnetic domain control intensity at the intersection of the magnetic domain control processing line and the imaginary line under the condition of thermal strain.

[0055] Figure 20 This is a top view schematic diagram illustrating the method for measuring the magnetic domain control intensity at the intersection of the magnetic domain control processing line and the imaginary line when the magnetic domain control processing line is a slot. Detailed Implementation

[0056] (1. Oriented electromagnetic steel sheet 1)

[0057] The orientation-oriented electromagnetic steel plate 1 of this embodiment has magnetic domain control lines 11 on its surface, satisfying |β All |-|β Dr |≥0.1°。 |β All | is the average absolute value of the angle β across the entire surface of the orientation-oriented electromagnetic steel sheet 1. | β Dr | is the average value of the absolute value of the angle β at the intersection point of multiple imaginary lines VL3 set at 2mm intervals parallel to the rolling direction RD of the oriented electromagnetic steel plate 1 and the magnetic domain control processing line 11, i.e., the magnetic domain control point VP2.

[0058] (Magnetic domain control processing line 11)

[0059] Multiple magnetic domain control lines 11 disposed on the surface of the oriented electromagnetic steel sheet 1 serve to subdivide 180° magnetic domains. By subdividing the magnetic domains, the iron loss of the oriented electromagnetic steel sheet 1 can be reduced. A magnetic domain refers to a collection of magnetic dipoles existing inside a strongly magnetic material, with the magnetic moment aligned along a small region. A 180° magnetic domain refers to a magnetization direction aligned with the crystal structure. <100> A domain is oriented and sandwiched between two 180° domain walls that are approximately parallel to the rolling direction RD. The distance between adjacent domain walls of a 180° domain (domain wall spacing) is called the width of the 180° domain. Hereinafter, unless otherwise specified, the width of the 180° domain will be simply referred to as the "domain width".

[0060] A preferred example of the magnetic domain control processing line 11 is thermal strain and / or grooves. By subdividing the magnetic domains, the iron loss of the orientation-oriented electromagnetic steel sheet 1 can be suppressed. However, the magnetic domain control processing line 11 changes the magnetostrictive properties of the orientation-oriented electromagnetic steel sheet 1 by closing the magnetic domains. As a result, the noise characteristics of the orientation-oriented electromagnetic steel sheet 1 deteriorate.

[0061] The magnetic domain control processing line 11 is formed in a direction intersecting the rolling direction RD of the oriented electromagnetic steel sheet 1. Figure 2 In the typical oriented electromagnetic steel sheet 1 illustrated, the magnetic domain control processing lines 11 are formed across the entire width of the oriented electromagnetic steel sheet 1. However, in cases such as Figure 1In the orientation-oriented electromagnetic steel sheet 1 of this embodiment, it is not necessary to provide the domain control processing lines 11 throughout the entire width of the orientation-oriented electromagnetic steel sheet 1. At least a portion of the domain control processing lines 11 are interrupted in the region 12B with a large β angle, which will be described later.

[0062] exist Figure 1 In the illustrated orientation-oriented electromagnetic steel sheet 1, the domain control processing line 11 is a straight line. However, the domain control processing line 11 can also be curved. The domain control processing line 11 can also have a shape with both straight and curved portions. Furthermore, the domain control processing line 11 can be located on one side or both sides of the orientation-oriented electromagnetic steel sheet 1. When the domain control processing line 11 is located on both sides of the orientation-oriented electromagnetic steel sheet 1, various configurations of the orientation-oriented electromagnetic steel sheet 1 in this embodiment only need to be applied to at least one side of the orientation-oriented electromagnetic steel sheet 1.

[0063] (β angle)

[0064] In the orientation-oriented electromagnetic steel sheet 1 of this embodiment, the value |β is calculated by measuring the β angle. All | and |β Dr | Satisfies the specified relationship. The β angle refers to the offset angle of the grain relative to the Goss orientation around the axis of the rolling right-angle direction TD. It is known that controlling the β angle is effective for controlling the magnetic properties of the oriented electromagnetic steel sheet 1. It should be noted that the offset angle of the grain relative to the Goss orientation around the axis of the rolling surface normal direction ND is called the α angle, and the offset angle of the grain relative to the Goss orientation around the axis of the rolling direction RD is called the γ angle.

[0065] like Figure 3 As shown, in the orientation electromagnetic steel plate 1 (the original plate 2 described later) before magnetic domain control treatment, there is a close relationship between the β angle and the magnetic domain width. Figure 3 This is a graph illustrating an example of the relationship between the β angle and the average value of the domain width in the orientation-oriented electromagnetic steel sheet 1 before domain control treatment. In the orientation-oriented electromagnetic steel sheet 1 before domain control treatment, the smaller the β angle, the larger the domain width. However, in the orientation-oriented electromagnetic steel sheet 1 after domain control treatment, Figure 3 The relationship shown does not hold. This is because the domain control process reduces the domain width in regions where the domain width was wide before domain control, while not changing the orientation (α angle, β angle, γ angle) of the grains.

[0066] (|β) All |-|β Dr |)

[0067] The orientation-oriented electromagnetic steel plate 1 in this embodiment satisfies |β All |-|β Dr |≥0.1°。 |β All| is the average absolute value of the angle β across the entire surface of the orientation-oriented electromagnetic steel sheet 1. | β Dr | is an indicator of the β angle in the magnetic domain control processing line 11. Specifically, |β Dr |β is the average of the absolute values ​​of the β angle at the intersection points (i.e., domain control points VP2) of multiple imaginary lines VL3 set parallel to the rolling direction RD of the oriented electromagnetic steel sheet 1 at 2mm intervals. The β angle is obtained by averaging the absolute values ​​of the β angles measured at multiple domain control points VP2. Dr |。|β All | and |β Dr Details of the determination method for | will be described later.

[0068] In the orientation-oriented electromagnetic steel plate 1, |β All |-|β Dr When the β angle is ≥0.1°, the magnetic domain control processing line 11 is preferentially set in the region 12A with a small β angle. Generally, the orientation-oriented electromagnetic steel plate 1 has a region 12A with a small β angle and a region 12B with a large β angle. Figure 1 In the schematically illustrated orientation-type electromagnetic steel sheet 1, magnetic domain control processing lines 11 are preferentially arranged in the region 12A with a small β angle. Therefore, the index of the β angle in the magnetic domain control processing line 11 is |β... Dr |The average value of the β angle across the entire surface of the oriented electromagnetic steel sheet 1 is less than |β All On the other hand, in Figure 2 In the typical orientation-oriented electromagnetic steel sheet 1 shown, the domain control processing lines 11 are arranged without considering the distribution of the β angle. Therefore, the index of the β angle in the domain control processing lines 11 is |β... Dr |The average value of the β angle across the entire surface of the orientation-oriented electromagnetic steel sheet 1|β All They are essentially the same value.

[0069] (Basic principles and effects)

[0070] The inventors discovered that, according to satisfying |β All |-|β Dr | ≥ 0.1° orientation of electromagnetic steel sheet 1 can achieve both low iron loss and low noise. This is because, while satisfying |β All |-|β Dr In the orientation-oriented electromagnetic steel sheet 1 with an angle ≥0.1°, a domain control processing line 11 is provided in the region 12A with a small β angle, i.e., the region with a wide domain width before the domain control processing stage. On the other hand, the domain control processing is suppressed in the region 12B with a large β angle, i.e., the region with a narrow domain width before the domain control processing stage. Hereinafter, refer to Figures 4A-4C The basic principles and effects of this disclosure are explained.

[0071] First, the inventors compared the magnetic domain structure of the orientation electromagnetic steel plate 1 before and after the magnetic domain control treatment. Figure 4A This is an example of the distribution of magnetic domain widths in an orientation-type electromagnetic steel sheet 1 before magnetic domain control treatment. Figure 4B Indicates to Figure 4A The distribution of magnetic domain widths on the surface of the oriented electromagnetic steel sheet 1 after magnetic domain control treatment. The magnetic domain control treatment is accomplished by continuous wave laser irradiation in a direction approximately perpendicular to the rolling direction RD. Figure 4A and Figure 4B The distribution of magnetic domain widths shown was derived from the magnetic domain image of the orientation electromagnetic steel plate 1 using the two-dimensional Fourier transform described later.

[0072] Furthermore, in Figure 4C The middle shows Figure 4A and Figure 4B The difference. Figure 4C Indicates in Figure 4A and Figure 4B The domain width before and after the domain control processing is subdivided into regions larger than 50 μm. According to... Figure 4C The regions where the domain width is subdivided through domain control processing are visualized.

[0073] according to Figure 4C It can be seen that the region with magnetic domain subdivision of over 50 μm produced by magnetic domain control processing is... Figure 4A The dark areas represent regions with wide domain widths in the initial stage of domain control processing. In particular, it is evident that the domain subdivision effect is significantly observed in regions where the original domain width is approximately 500 μm or more. On the other hand, in... Figure 4A In the bright areas, which are regions with narrow domain widths in the initial stage of domain control processing, the effect of domain control processing is almost imperceptible. The effectiveness of domain control processing varies depending on the domain width before processing.

[0074] The inventors investigated in more detail the relationship between the reduction in domain width resulting from domain control processing and the domain width before domain control processing. Figure 5 This represents the relationship between the domain width before and after domain control processing at the same location. Domain control processing is set as laser irradiation. During laser irradiation, the average irradiation energy density Ua (mJ / mm²) is... 2 The irradiation spacing PL (mm) is set to Ua = 1.5 mJ / mm. 2 PL=4mm.

[0075] according to Figure 5It is evident that the domain subdivision effect of domain control processing is difficult to manifest in regions with narrow domain widths. Particularly in regions where the domain width is less than approximately 500 μm, the domain width is roughly the same before and after domain control processing. Therefore, it is believed that the reduction in iron loss brought about by domain control processing is greater in regions with wider domain widths before domain control, but not sufficiently achieved in regions where the domain width before domain control is narrower than a specified value. It is also believed that the domain control processing line 11 formed in regions with domain widths narrower than the specified value leads to a deterioration in noise characteristics caused by closed domains.

[0076] Based on the above insights, it is evident that in previous domain control processes for oriented electromagnetic steel sheets 1, domain control was applied to areas where it was unnecessary, which contributed to increased noise. Furthermore, it is known that prioritizing domain control in regions with wide domain widths is extremely effective in achieving both low iron loss and low noise. Domain control in wide domain width regions can reduce iron loss. Additionally, minimizing domain control in narrow domain width regions can prevent the deterioration of noise characteristics.

[0077] In addition, such as Figure 3 As shown, there is a close relationship between the domain width and the β angle before the domain control processing. The region 12A with a small β angle roughly coincides with the region with a wide domain width in the stage before the domain control processing. Therefore, the domain control processing line 11 is preferentially set in the region 12A with a small β angle to satisfy |β All |-|β Dr | ≥ 0.1° Orientation electromagnetic steel sheet 1 is an orientation electromagnetic steel sheet 1 that preferentially undergoes magnetic domain control processing in regions with wide magnetic domain widths. In other words, it satisfies |β All |-|β Dr |The orientation-oriented electromagnetic steel sheet 1 with a magnetic domain width of ≥0.1° can achieve both low iron loss and low noise by preferentially performing magnetic domain control processing on regions with wide magnetic domain widths.

[0078] The most basic embodiment of the orientation-oriented electromagnetic steel sheet 1 has been described above. Further preferred embodiments will now be described.

[0079] (|β) All |-|β Dr |Preferred numerical range)

[0080] |β All |-|β Dr From the perspective of improving noise characteristics, a larger β value is preferable. All |-|β Dr |More preferably, the angle is 0.2° or more, 0.5° or more, or 1.0° or more. That is, it is further preferred that |β| is satisfied. All |-|βDr |≥0.2°、|β All |-|β Dr |≥0.5° or|β All |-|β Dr |≥1.0°. This results in further improvement in noise characteristics.

[0081] |β All |-|β Dr There is no specific upper limit for |, for example, |β All |-|β Dr | Can be below 5.0°, below 4.0°, or below 3.0°.

[0082] (|β) All |-|β Dr |and σ All (The relationship between them)

[0083] Oriented electromagnetic steel sheet 1 preferably satisfies |β All |-|β Dr |>σ All / 2. σ All This is the standard deviation of the absolute value of the β angle across the entire surface of the orientation-oriented electromagnetic steel sheet 1. The β angle measured on the surface of the orientation-oriented electromagnetic steel sheet 1 exhibits non-uniformity. The index of this non-uniformity is σ. All In |β All |-|β Dr |Exceeding σ All In the case of / 2, it indicates that the region for implementing domain control processing is selectively determined by the β angle. Since domain control processing is concentrated in the region with a wide domain width and a large reduction in iron loss before domain control, further improvement in noise characteristics can be achieved.

[0084] (σ) Dr With σ All (relationship)

[0085] Oriented electromagnetic steel sheet 1 preferably satisfies σ Dr <σ All σ All σ is the standard deviation of the absolute value of the angle β across the entire surface of the orientation-oriented electromagnetic steel sheet 1. Dr It is the standard deviation of the absolute value of the angle β at the intersection point VP2, i.e., the magnetic domain control point, of multiple imaginary lines VL3 set parallel to the rolling direction RD of the oriented electromagnetic steel sheet 1 at 2mm intervals and the magnetic domain control processing line 11. This is provided under the condition that σ... Dr <σ AllIn the orientation-oriented electromagnetic steel sheet 1, the non-uniformity of the β angle at the domain control point VP2 is smaller than the non-uniformity of the β angle of the entire orientation-oriented electromagnetic steel sheet 1. That is, in this case, the domain control treatment is concentrated in the region where the domain width is wide and the iron loss reduction effect is large before domain control, thus further improvement of noise characteristics can be achieved.

[0086] (Magnetic domain control processing line 11)

[0087] The type of magnetic domain control processing line 11 is not particularly limited, but preferred examples are thermal strain and grooves. Thermal strain can be formed, for example, by means of laser irradiation, electron beam irradiation, and ion implantation. Grooves can be formed, for example, by means of laser irradiation, electron beam irradiation, and machining.

[0088] Thermal strain disappears through stress-relief annealing or heat treatment based thereon. Therefore, when the orientation-oriented electromagnetic steel sheet 1 is heat-treated, the domain control processing line 11 is preferably provided as a groove. On the other hand, since thermal strain can be easily formed, the domain control processing line 11 is preferably provided as thermal strain when simplification of the manufacturing process is required. The orientation-oriented electromagnetic steel sheet 1 may also have both thermal strain and groove.

[0089] Preferably, in this embodiment, the magnetic domain control intensity is determined based on the magnetic domain width of the orientation electromagnetic steel sheet before the magnetic domain control treatment. The magnetic domain control intensity is the amount of thermal strain when the means of magnetic domain control is thermal strain, and the depth of the groove when the means of magnetic domain control is a groove.

[0090] The greater the intensity of magnetic domain control, the better the effect of subdividing the magnetic domains. On the other hand, the greater the intensity of magnetic domain control, the more likely it is to lead to increased hysteresis loss and deterioration of noise characteristics. In addition, according to the novel insights of the inventors, the saturation intensity of magnetic domain control varies in oriented electromagnetic steel sheets.

[0091] Domain control saturation strength refers to the domain control strength at which the effect of domain subdivision becomes substantially saturated. When the domain control strength is below the domain control saturation strength, a higher domain control strength results in lower iron losses. However, when the domain control strength exceeds the domain control saturation strength, even increasing the domain control strength yields almost no improvement in iron loss reduction. On the other hand, even when the domain control strength exceeds the domain control saturation strength, a higher domain control strength leads to increased hysteresis losses and worsened noise characteristics. Therefore, the domain control strength is ideally located within the range not exceeding the domain control saturation strength.

[0092] Furthermore, the inventors discovered a strong correlation between the domain control saturation intensity and the β angle. At locations with a small β angle, the domain control saturation intensity is high. Additionally, a correlation exists between the β angle and the domain width in the oriented electromagnetic steel sheet before domain control treatment. In the oriented electromagnetic steel sheet before domain control treatment, a larger β angle results in a narrower domain width. However, in the oriented electromagnetic steel sheet after domain control treatment, the correlation between domain width and the β angle decreases. This is because the domain control treatment changes the domain width but not the β angle.

[0093] Therefore, it is preferable to select the optimal domain control intensity based on the domain width or β angle. Specifically, it is preferable to perform domain control treatment with a high intensity in areas with a large domain width and a small β angle, and to perform domain control treatment with a low intensity in areas with a small domain width and a large β angle. Furthermore, as mentioned above, domain control treatment is not performed in areas where the original domain width is narrower than a predetermined value. This results in an orientation-oriented electromagnetic steel sheet with non-uniform domain control intensity. In such an orientation-oriented electromagnetic steel sheet, the iron loss is further reduced after domain control. On the other hand, the increase in hysteresis loss and the deterioration of noise characteristics in the orientation-oriented electromagnetic steel sheet after domain control are further suppressed.

[0094] Figure 15 The diagram illustrates a method for determining the domain control strength based on the domain width. Figure 15 The vertical axis represents the domain control strength, and the horizontal axis represents the domain width. Figure 15 The solid line curve represents the domain control saturation intensity. In regions with narrow domain widths, the domain control effect is not achieved, and therefore the domain control saturation intensity is 0. For example, in regions with domain widths exceeding 500 μm, the domain control effect is achieved. Moreover, in regions with domain widths exceeding 500 μm, the larger the domain width, the greater the domain control saturation intensity. Furthermore, for example, in regions with domain widths exceeding approximately 1200 μm, the domain control saturation intensity is approximately constant. Here, the regions where the domain control effect is achieved are not limited to regions exceeding 500 μm. The regions where the domain control saturation intensity is approximately constant are not limited to regions exceeding approximately 1200 μm. These regions vary depending on various conditions.

[0095] Figure 16 The diagram illustrates a method for determining the domain control strength based on the β angle. Figure 16 The vertical axis represents the domain control intensity, and the horizontal axis represents the magnitude of the β angle. Figure 16The solid line curve represents the domain control saturation intensity. In regions with large β angles, no domain control effect is achieved, therefore the domain control saturation intensity is 0. In regions with β angles below a specified value, the domain control effect is achieved. For example, when the β angle is below 2.0°, the domain control effect is presumed. Furthermore, in regions with β angles below the specified value, the larger the β angle, the greater the domain control saturation intensity. Moreover, in regions with smaller β angles, the domain control saturation intensity is approximately constant.

[0096] The optimal relationship between the domain width and the domain control intensity at the site where domain control is implemented is as follows: Figure 11 The curve is on the solid line in the diagram. Alternatively, the optimal relationship between the β angle at the site where domain control is implemented and the domain control intensity is... Figure 16 The solid line on the curve represents the domain control saturation intensity, which can be used as the target value for the domain control intensity.

[0097] Furthermore, there exists a minimum intensity at which the magnetic domain control effect manifests, i.e., the minimum intensity of magnetic domain control. When performing magnetic domain control, it is further preferred that the magnetic domain control intensity be greater than or equal to the minimum intensity of magnetic domain control.

[0098] However, the domain control intensity can also be slightly uneven relative to the target domain control saturation intensity. Figure 15 and Figure 16 In this context, the region above the minimum domain control intensity and within a certain range of the domain control saturation intensity curve is defined as the target range of domain control intensity. The domain control intensity and the domain width of the domain control target area are preferably within a certain range. Figure 15 and Figure 16 The interior of the shaded area surrounded by dashed lines.

[0099] Thus, a oriented electromagnetic steel sheet with non-uniform magnetic domain control intensity is obtained. In such an oriented electromagnetic steel sheet, the magnetic domain control intensity varies depending on the β angle. In this oriented electromagnetic steel sheet, the iron loss of the oriented electromagnetic steel sheet after magnetic domain control is further reduced. On the other hand, the increase in hysteresis loss and the deterioration of noise characteristics of the oriented electromagnetic steel sheet after magnetic domain control are further suppressed.

[0100] Multiple magnetic domain control processing lines 11 disposed on the surface of the orientation-oriented electromagnetic steel plate 1 can, as follows: Figure 1 The image shown is a straight line, or it can be like... Figure 14 The curve is shown. If the multiple domain control processing lines 11 set on the surface of the orientation-oriented electromagnetic steel plate 1 are curves, the degree of freedom of the domain control processing is increased, making it easier to selectively perform domain control processing only on the parts with small β angles, thereby improving the performance of the orientation-oriented electromagnetic steel plate 1, which is therefore preferred.

[0101] (2. Manufacturing apparatus for oriented electromagnetic steel sheet 1)

[0102] Next, an example of the manufacturing apparatus for the orientation-oriented electromagnetic steel sheet 1 of this embodiment will be described. However, the manufacturing apparatus described below is merely illustrative. The orientation-oriented electromagnetic steel sheet 1 of this embodiment can be manufactured using any apparatus.

[0103] Figure 6 This is an example of the hardware configuration of an image acquisition device 30 that acquires magnetic domain images of the original plate 2, i.e., the orientation electromagnetic steel plate 1 before magnetic domain control processing. The image acquisition device 30 includes a light source unit 31, a magneto-optical sensor (MO sensor 33), an image sensor 35, and a signal processing unit 37.

[0104] The light source unit 31 has a light source composed of light-emitting diodes (LEDs) that illuminates the MO sensor 33 with light of the same polarization plane.

[0105] The MO sensor 33 is a device for measuring the magnetic domain structure of a magnetic material. The MO sensor 33 has an observation surface on which the magnetic material sample to be measured is placed. Light irradiated from the light source 31 is reflected by a reflective layer inside the MO sensor 33. The reflected light passes through the interior of the MO sensor 33 again and is output to the exterior. When the original plate 2, which is the magnetic material sample, is placed on the observation surface of the MO sensor 33, a leakage magnetic field corresponding to the spontaneous magnetization of the original plate 2 is generated inside the MO sensor 33. Through this leakage magnetic field, the polarization plane of the reflected light rotates.

[0106] Image sensor 35 is a complementary metal-oxide-semiconductor (CMOS) image sensor. Image sensor 35 images the reflected light from MO sensor 33 onto the light-receiving surface and performs photoelectric conversion, outputting the photoelectric converted analog signal to signal processing unit 37. By using image sensor 35 to detect the reflected light after the polarization plane is rotated, the distribution of the leakage magnetic field can be obtained, and the magnetic domain structure of the original plate 2 becomes clear.

[0107] The signal processing unit 37 includes an amplifier, an analog-to-digital converter (ADC), and a digital signal processor (DSP). The analog signal output from the image sensor 35 is amplified by the amplifier. Then, the analog signal is converted into a digital signal by the ADC. An image signal is generated by performing prescribed digital processing on the digital signal using the DSP. The image signal generated by the signal processing unit 37 is output to the analysis device 40 (see reference 40) via cable or wireless communication. Figure 7 ).

[0108] Figure 7 This describes the hardware configuration of the analysis device 40, which analyzes the magnetic domain structure of the original board 2. The analysis device 40 is a computer device such as a personal computer (PC). The analysis device 40 includes an arithmetic unit 41, a memory 43, a display unit 45, an input unit 47, and a communication I / F 49.

[0109] The arithmetic unit 41 has a central processing unit (CPU). The arithmetic unit 41 parses the domain structure from the domain image of the original board 2 according to a program stored in the memory 43. Then, the arithmetic unit 41 determines the domain control processing region 21 as the location for applying domain control processing. The processing performed by the arithmetic unit 41 will be described in detail later.

[0110] 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 arithmetic unit 41 and the data required to execute these programs. The programs and data stored in the RAM are loaded into the RAM and executed.

[0111] The memory 43 may also be a magnetic storage device such as a hard disk drive (HDD) or an optical storage device such as an optical disc. Alternatively, the memory 43 may be removable from the parsing device 40 and store programs and data on a computer-readable recording medium. Alternatively, the memory 43 may also receive programs executed by the arithmetic unit 41 from a network via the communication I / F 49.

[0112] Display unit 45 includes a liquid crystal display (LCD), a plasma display, or an organic electroluminescent (EL) display. Display unit 45 displays an image based on an image signal output from image acquisition device 30. Additionally, display unit 45 displays the analysis results based on the magnetic domain structure of arithmetic unit 41.

[0113] Input unit 47 includes input devices such as a mouse and keyboard. Communication I / F 49 is an interface for sending and receiving data with external devices via networks such as local area networks (LANs), wide area networks (WANs), and the Internet.

[0114] As the computing unit 41, it can also replace general-purpose hardware such as CPUs and adopt special-purpose integrated circuits (ASICs) or field-programmable gate arrays (FPGAs) specifically designed for the analysis of magnetic domain structures.

[0115] It should be noted that, Figure 6 and Figure 7 The illustration shows a case where the image acquisition device 30 and the resolution device 40 are different devices, but a system integrating the image acquisition device 30 and the resolution device 40 can also be used.

[0116] As a means of introducing thermal strain onto the surface of the original plate 2, known methods such as laser irradiation, electron beam irradiation, and ion implantation can be used. As a means of forming grooves on the surface of the original plate 2, known methods such as laser irradiation, electron beam irradiation, and machining can be used. The configuration of the laser irradiation device 500 for introducing thermal strain by laser irradiation will be described below.

[0117] Figure 8 This describes 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 condenser lens 507, a motor 509, a sensor 511, a control unit 513, and a through plate device 515.

[0118] The plate-passing device 515 causes the original plate 2 to pass through in the rolling direction RD.

[0119] The polygon mirror 501 is, for example, a regular polygonal prism. Multiple plane mirrors are respectively provided on multiple sides of the polygon mirror 501 that constitute the regular polygonal prism. The laser beam LB is incident from the light source device 503 through the collimator 505 in one direction (horizontal direction) onto the plane mirror of the polygon mirror 501 and is reflected by the plane mirror.

[0120] The polygon mirror 501 can rotate around the rotation axis O1 driven by the motor 509. Depending on the rotation angle of the polygon mirror 501, the incident angle of the laser beam LB relative to the plane mirror changes sequentially. Therefore, the reflection direction of the laser beam LB changes sequentially, enabling it to scan the surface of the original plate 2. Figure 8 The symbol P represents the interval between adjacent magnetic domain control processing lines 11, that is, the irradiation spacing of the laser beam LB.

[0121] Under the control of the control unit 513, the light source device 503 outputs a laser beam LB in a prescribed irradiation mode (e.g., continuous irradiation mode or pulse irradiation mode).

[0122] A condenser lens 507 is disposed in the optical path of the laser beam LB reflected from the polygon mirror 501. The condenser lens 507 constitutes a condenser optical system with a specified focal length. The laser beam LB reflected from the polygon mirror 501 is focused onto the surface of the original plate 2 by the condenser lens 507, thereby introducing thermal strain onto the surface of the original plate 2.

[0123] Motor 509 is connected to polygon mirror 501. Motor 509 rotates and drives polygon mirror 501 under the control of control unit 513.

[0124] Sensor 511 is connected to the drive shaft of motor 509. Sensor 511 detects the rotation angle of the polygon mirror 501 rotated by motor 509. In addition, sensor 511 outputs a signal indicating the detected rotation angle (hereinafter referred to as rotation angle signal) to control unit 513.

[0125] The control unit 513 is composed of a processor. The control unit 513 is connected to the light source device 503, the motor 509, the sensor 511, and the through-plate device 515. The control unit 513 receives speed signal input from the through-plate device 515. Furthermore, the control unit 513 outputs a signal to the motor 509 instructing the rotation drive of the polygon mirror 501.

[0126] Furthermore, the control unit 513 controls the switching on and off of the power of the laser beam LB output by the light source device 503 based on the stress input signal representing the magnetic domain control processing area 21 and the rotation angle signal output from the sensor 511. When the laser irradiation device 500 is electrically connected to the analysis device 40, the stress input signal is input from the analysis device 40 to the laser irradiation device 500. It should be noted that the stress input signal can also be input to the laser irradiation device 500 by the operator.

[0127] (3. Manufacturing method of oriented electromagnetic steel sheet 1)

[0128] Next, the manufacturing method of the orientation-oriented electromagnetic steel sheet 1 according to this embodiment will be described. According to the manufacturing method of the orientation-oriented electromagnetic steel sheet 1 according to this embodiment, the orientation-oriented electromagnetic steel sheet 1 of this embodiment can be suitably manufactured. However, the manufacturing method described below is merely an example of a preferred manufacturing method for the orientation-oriented electromagnetic steel sheet 1 and is not limited to the orientation-oriented electromagnetic steel sheet 1. It should be noted that, for ease of explanation, the manufacturing apparatus will be appropriately mentioned in the description of the manufacturing method. However, the manufacturing apparatus mentioned below is merely a preferred example for implementing the manufacturing method of the orientation-oriented electromagnetic steel sheet 1 of this embodiment.

[0129] like Figure 9 As shown in the flowchart, the manufacturing method of the orientation-oriented electromagnetic steel sheet 1 in this embodiment includes: step S62, obtaining a magnetic domain image of the original plate 2 of the orientation-oriented electromagnetic steel sheet 1; step S64, determining a magnetic domain control processing region 21 based on the distribution of magnetic domain widths in the magnetic domain image; and step S66, applying magnetic domain control processing to the magnetic domain control processing region 21 determined based on the distribution of magnetic domain widths.

[0130] First, obtain the magnetic domain image of the original plate 2 (refer to...). Figure 9 (S62). The original plate 2 refers to the orientation electromagnetic steel plate 1 before the application of magnetic domain control processing. The magnetic domain image can be acquired, for example, by the image acquisition device 30. Then, the distribution of the width of the 180° magnetic domains (magnetic domain width) is derived from the magnetic domain image. The distribution of the magnetic domain width in the original plate 2 can be derived, for example, by using the calculation unit 41 of the analysis device 40.

[0131] Then, regions with a domain width greater than a specified value (e.g., approximately 500 μm or more) are designated as domain control processing regions 21 (see reference). Figure 9 (S64). It should be noted that the region in the original plate 2 with a magnetic domain width greater than the specified value corresponds to the region 12A with a small β angle in the oriented electromagnetic steel plate 1.

[0132] The magnetic domain image displayed on the display unit 45 can also be visually observed by the operator to determine the magnetic domain control processing area 21, and the stress introduction signal representing the magnetic domain control processing area 21 can be input to the laser irradiation device 500.

[0133] Next, magnetic domain control processing is preferentially implemented in the domain control processing region 21 (refer to...). Figure 9 (S66). Preferably, magnetic domain control processing is performed only on the magnetic domain control processing region 21. When the magnetic domain control processing line 11 is under thermal strain, the magnetic domain control processing can be performed by irradiation with a laser beam LB based on the laser irradiation device 500, or by other means such as ion implantation or electron beam irradiation. When the magnetic domain control processing line 11 is a groove, the magnetic domain control processing can also be performed using a tool for machining.

[0134] An example of a method for determining the domain control processing region 21 will be described in detail. The processing for a specific domain control processing region 21 is performed, for example, by the arithmetic unit 41 of the analysis device 40.

[0135] The arithmetic unit 41 uses, for example, the line segment method or Fourier transform to derive the distribution of the magnetic domain width of the original plate 2. Then, the arithmetic unit 41 determines the regions with magnetic domain widths of a predetermined value or higher (e.g., about 500 μm or higher) as the areas where magnetic domain control processing is preferentially applied.

[0136] In the line segment method, evaluation is performed by subtracting line segments perpendicular to the magnetic domains. The line segments are spaced out in groups of three per 1 cm in a direction parallel to the magnetic domain. The domain width is derived based on the interval between the intersection points of the 180° domain walls and the line segments.

[0137] Fourier transform is particularly effective as a means of analyzing the magnetic domain structure of magnetic bodies with periodic magnetic domain structures, such as oriented electromagnetic steel plate 1 and original plate 2. Hereinafter, a method for deriving the distribution of magnetic domain widths of original plate 2 will be explained using a short-term Fourier transform (hereinafter referred to as "ST2DFT"), which extends the short-term Fourier transform, one of the earliest signal processing methods used in the time / frequency analysis of sound signals, to a two-dimensional region.

[0138] The image (magnetic domain image) represented by the image signal acquired by the image acquisition device 30 is labeled as x(k, l) as a data string of two-dimensional coordinates (kl coordinates). In this embodiment, the magnetic domain image to be analyzed is an image of grayscale, binarized from two colors, or represented by three or more color levels (multi-color levels).

[0139] In order to derive the distribution of the domain width of the original plate 2, the arithmetic unit 41 performs the following processes (A-1), (A-2) and (A-3). (A-1) Processing of cutting out multiple partial regions from a magnetic domain image; (A-2) Perform ST2DFT processing; (A-3) Processing to derive the distribution of magnetic domain width.

[0140] The following section provides a detailed explanation of the processing of A-1 to A-3.

[0141] (A-1) Processing of cutting out multiple partial regions from magnetic domain images

[0142] To extract multiple regions from the magnetic domain image and analyze their respective frequency structures, the range of the k-direction is set to 0 ≤ k ≤ N. k -1. Set the range of the l-direction to 0 ≤ l ≤ N l The window function Wa(k, l)(N) for a rectangular window of -1 k and N l (where k is a natural number). As a window function Wa(k, l), it can be used with Hamming windows, Hanning windows, Blackman windows, etc.

[0143] The observation position in the data string x(k, l) of the magnetic domain image is represented by the index (n, m), and the displacement of the window function Wa(k, l) in the k and l directions is represented by S. k and S l Time (n, m, S) k S l (where n is an integer), as shown in equation (1), nS is obtained by cutting out the magnetic domain image. k ≤k≤nS k +N k -1, mS l ≤l≤mS l +N l The data string x in the range of -1 is a partial region of the data string. nm (k-nS) k ,l-mS l ).

[0144] [Mathematical Expression 1]

[0145] Figure 10 Examples are shown of partial regions cut from the magnetic domain image G corresponding to the observation positions (n, m) = (1,1), (2,2), (3,3), ..., (P, Q) (P and Q are natural numbers).

[0146] In this embodiment, N is used to determine the range of the window function Wa(k,l). k and N lThese are the parameters corresponding to the number of pixels in the k-direction and the number of pixels in the l-direction of a given region, respectively.

[0147] (A-2) Perform ST2DFT processing

[0148] Define a portion of the data string as x nm (n′, m′) = x nm (k-nS) k ,l-mS l ), for x nm When performing a two-dimensional Fourier transform on (n′, m′), as shown in equation (2), a partial Fourier image X(f) corresponding to a portion of the region at the observation position (n, m) is obtained. k f l (n, m).

[0149] [Mathematical Expression 2]

[0150] Here, f k and f l It is spatial frequency.

[0151] When the spatial frequency f k The resolution is expressed as Δf k , the spatial frequency f l The resolution is expressed as Δf l When, Δf k and Δf l Defined as in equation (3).

[0152] [Mathematical Expression 3]

[0153] Here, Δk and Δl represent the spatial resolution in the k-direction and the spatial resolution in the l-direction of the magnetic domain image, respectively.

[0154] For example, when on Figure 10 The data strings x for each of the shown regions nm (k-nS) k ,l-mS l When performing a two-dimensional Fourier transform, such as Figure 11 As shown, a partial Fourier image X(f) is obtained at each observation position (n, m). k f l (n, m).

[0155] (A-3) Processing for deriving the distribution of magnetic domain widths

[0156] When a partial Fourier image X(f) is obtained k , f lWhen (f, n, m), calculate the partial Fourier image X(f) k , f l The coordinates of the peak position of the point (k-component f) at (n,m). k max (n, m) and l component f l max (n, m). It should be noted that, regarding the derivation of peak positions, the region near k=0 and l=0 is largely dependent on the image contrast, and therefore is excluded.

[0157] Then, based on the resolution of the spatial frequency defined by Equation (3) and the peak position of the points of the partial Fourier image, the distribution L(n, m) of the magnetic domain width is derived as in Equation (4).

[0158] [Mathematical Expression 4]

[0159] Thus, by using ST2DFT, the distribution L(n, m) of the magnetic domain width can be quantitatively derived while preserving the positional information of the magnetic domain image. The above... Figures 4A-4C This represents the analytical result of the domain width derived from ST2DFT.

[0160] Figure 12 This is a top view of an example of the original plate 2. Figure 12 This represents the domain control processing region 21 and the non-domain control processing region 22 of the original plate 2, based on the domain image. The domain control processing region 21 of the original plate 2 roughly corresponds to the region 12A with a small β angle in the orientation-oriented electromagnetic steel plate 1. Furthermore, the non-domain control processing region 22 of the original plate 2 roughly corresponds to the region 12B with a large β angle in the orientation-oriented electromagnetic steel plate 1. Domain control processing is applied to... Figure 12 The dotted line shown.

[0161] When the arithmetic unit 41 derives the domain width distribution L(n, m), the arithmetic unit 41 determines the region with a domain width greater than or equal to a predetermined value as the domain control processing region 21 (i.e., the region where domain control processing is applied). The control unit 513 of the laser irradiation device 500 turns on the power of the laser beam LB to the domain control processing region 21, and preferably controls it to turn off the power of the laser beam LB to the non-domain control processing region 22 (i.e., the region other than the domain control processing region 21). As a result, the domain control processing line 11 is introduced into the domain control processing region 21 of the original board 2. In addition, the introduction of the domain control processing line 11 in the non-domain control processing region 22 of the original board 2 is suppressed to a minimum.

[0162] It should be noted that the above steps can also yield a magnetic domain image of the orientation-controlled electromagnetic steel sheet 1. In the magnetic domain image of the orientation-controlled electromagnetic steel sheet 1, the magnetic domain control processing line 11 is sometimes unclear. In this case, the observation conditions can be adjusted to clearly identify the magnetic domain control processing line 11. For example, by applying a DC magnetic field perpendicular to the surface (thickness direction) of the orientation-controlled electromagnetic steel sheet 1, the magnetic domain control processing line 11 can be made clearer.

[0163] The embodiments of this disclosure have been described above, but this disclosure is not limited thereto and can be appropriately modified without departing from its technical concept. Hereinafter, a further preferred example of the orientation-oriented electromagnetic steel sheet 1 and its manufacturing method according to this embodiment will be described. Unless otherwise specified, the preferred embodiments described below can be applied to both the orientation-oriented electromagnetic steel sheet 1 and its manufacturing method. As will be described later, the orientation-oriented electromagnetic steel sheet of this embodiment may have a magnesium olivine coating and / or an insulating coating on the surface of the base steel sheet.

[0164] The following will explain each point separately. However, when the oriented electromagnetic steel sheet has a base steel sheet, a forsterite coating, and / or an insulating coating, the following specifications regarding chemical composition, magnetic domain control treatment lines, magnetic domain control regions, and non-magnetic domain control treatment lines pertain to the base steel sheet. However, the specifications regarding sheet thickness apply to the entire oriented electromagnetic steel sheet, including the base steel sheet, the forsterite coating, and / or the insulating coating.

[0165] (Chemical composition and plate thickness)

[0166] The chemical composition of the orientation-oriented electromagnetic steel sheet 1 and the base sheet 2 is not limited, as long as it is equivalent to the known orientation-oriented electromagnetic steel sheet 1. For example, the chemical composition of the orientation-oriented electromagnetic steel sheet 1 and the base sheet 2, by mass%, may contain Si: 2.500~7.000%, Mn: 0.00~1.000%, C: 0~0.085%, acid-soluble Al: 0~0.065%, N: 0~0.012%, Cr: 0~0.300%, Cu: 0~0.400%, P: 0~0.500%, Sn: 0~0.3%. 0.00%, Sb: 0~0.300%, Ni: 0~1.000%, S: 0~0.015%, Se: 0~0.015%, Bi: 0~0.020%, Nb: 0~0.030%, V: 0~0.030%, Mo: 0~0.030%, Ta: 0~0.030%, W: 0~0.030%, B: 0~0.080%, Ti: 0~0.015%. The balance of the chemical composition includes Fe and impurities.

[0167] The thickness of the oriented electromagnetic steel sheet 1 and the original sheet 2 is not limited, but is preferably 0.15 to 0.30 mm. By setting it to 0.30 mm or less, classical eddy current losses can be suppressed, further improving iron loss. On the other hand, by making the sheet thickness 0.15 mm or more, rolling efficiency can be improved, thus increasing productivity.

[0168] (Surface treatment)

[0169] Oriented electromagnetic steel sheet 1 and base sheet 2 may also have a magnesium olivine coating. Additionally, oriented electromagnetic steel sheet 1 and base sheet 2 may also have an insulating coating. The magnesium olivine coating and the insulating coating may be formed on one side or both sides of the oriented electromagnetic steel sheet 1.

[0170] Forsterite coatings are, for example, inorganic coatings with magnesium silicate as the main component. Forsterite coatings are formed, for example, by reacting an annealing release agent containing magnesium oxide (MgO) applied to the surface of a base steel sheet with the surface composition of the base steel sheet during final annealing. For example, a forsterite coating has a composition derived from the annealing release agent and the base steel sheet (more specifically, a composition with Mg2SiO4 as the main component). On the other hand, when an annealing release agent mainly composed of Al2O3 is used in the final annealing, a forsterite coating sometimes does not form.

[0171] The insulating coating imparts electrical insulation and tensile strength to the oriented electromagnetic steel sheet 1. By applying tension to the oriented electromagnetic steel sheet 1, the movement of magnetic domain walls within the sheet becomes easier, thereby reducing iron loss. Furthermore, the insulating coating can impart various properties to the oriented electromagnetic steel sheet 1, such as corrosion resistance, heat resistance, and slip resistance. The insulating coating can be, for example, a known coating formed by applying a coating solution primarily composed of phosphate and colloidal silica to the surface of a magnesium olivine coating and then sintering it.

[0172] The insulating coating is preferably formed after final annealing and after the magnetic domain control treatment. Alternatively, the insulating coating may be formed after the final annealing process and before the magnetic domain control treatment. In the case where the insulating coating is formed before the magnetic domain control treatment, the insulating coating may sometimes peel off in the magnetic domain control treatment line 11. Therefore, it is preferable to form the insulating coating again on the magnetic domain control treatment line 11 after the magnetic domain control treatment.

[0173] (The angle between the magnetic domain control processing line 11 and the rolling right-angle direction TD)

[0174] The angle between the domain control processing line 11 and the rolling right-angle direction TD is not particularly limited. The domain control processing line 11 and the rolling right-angle direction TD can also be approximately parallel. That is, the angle between the domain control processing line 11 and the rolling right-angle direction TD can also be substantially 0°. On the other hand, as... Figure 1 As illustrated, the angle between the domain control processing line 11 and the rolling right-angle direction TD can also exceed 0°. For example, the angle between the domain control processing line 11 and the rolling right-angle direction TD can be set to any value within the range of 0° to 45°. The angle between the domain control processing line 11 and the rolling right-angle direction TD can also be set to 1° or more, 3° or more, or 5° or more. The angle between the domain control processing line 11 and the rolling right-angle direction TD can also be set to 40° or less, 35° or less, or 30° or less.

[0175] like Figure 1 As illustrated, the angles formed by all the domain control processing lines 11 and the rolling right-angle direction TD can be the same. That is, all the domain control processing lines 11 can extend parallel to each other. On the other hand, the angles formed by the domain control processing lines 11 and the rolling right-angle direction TD can be uneven. That is, some or all of the multiple domain control processing lines 11 can extend non-parallel to each other. The average value of the angles formed by the domain control processing lines 11 and the rolling right-angle direction TD can also be set to 1° or more, 3° or more, or 5° or more. The average value of the angles formed by the domain control processing lines 11 and the rolling right-angle direction TD can also be set to 40° or less, 35° or less, or 30° or less. For one domain control processing line, the average value of the angle is calculated by measuring the angles formed by the domain control processing line and the rolling right-angle direction TD at multiple locations, or by measuring the angles formed by multiple domain control processing lines and the rolling right-angle direction TD at one or more locations, and then calculating the average value.

[0176] (The spacing of the magnetic domain control processing line 11 along the rolling direction RD)

[0177] The spacing P of the magnetic domain control processing lines 11 adjacent to each other along the rolling direction RD is not particularly limited. The smaller the spacing P, the better the effect of improving iron loss. On the other hand, the larger the spacing P, the better the noise characteristics. The spacing can be appropriately selected according to the characteristics required by the oriented electromagnetic steel sheet 1. For example, the spacing P of the magnetic domain control processing lines 11 adjacent to each other along the rolling direction RD can be set to 1.0 mm or more, 2.0 mm or more, 3.0 mm or more, or 5.0 mm or more. The spacing P of the magnetic domain control processing lines 11 adjacent to each other along the rolling direction RD can also be set to 10.0 mm or less, 9.0 mm or less, 8.0 mm or less, or 7.0 mm or less.

[0178] exist Figure 1In the illustrated oriented electromagnetic steel sheet 1, the domain control processing lines 11 are arranged at certain intervals. On the other hand, the interval P along the rolling direction RD of adjacent domain control processing lines 11 may also be uneven. For example, the average value of the interval P along the rolling direction RD of adjacent domain control processing lines 11 may be set to 1.0 mm or more, 2.0 mm or more, 3.0 mm or more, or 5.0 mm or more. The average value of the interval P along the rolling direction RD of adjacent domain control processing lines 11 may also be set to 10.0 mm or less, 9.0 mm or less, 8.0 mm or less, or 7.0 mm or less.

[0179] (The magnitude of the tensile stress introduced in thermal strain)

[0180] The magnetic domain control processing line 11 can also be thermal strain. In thermal strain, tensile stress is introduced. The greater the tensile stress, the better the effect of improving iron loss. On the other hand, the smaller the tensile stress, the better the noise characteristics. The tensile stress can be appropriately selected to correspond to the characteristics required by the oriented electromagnetic steel sheet 1.

[0181] The magnitude of the tensile stress is not particularly limited. For example, in at least a portion of the domain control processing line 11, the tensile stress relative to any direction is preferably 40 MPa or more, 60 MPa or more, or 80 MPa or more. If the tensile stress relative to at least one direction is 40 MPa or more, it is considered to satisfy the requirement of "tensile stress relative to any direction being 40 MPa or more". Furthermore, for example, in at least a portion of the domain control processing line 11, the tensile stress relative to any direction is preferably 300 MPa or less, 200 MPa or less, 180 MPa or less, or 150 MPa or less. The tensile stress relative to any direction in the domain control processing line 11 can be the same or non-uniform.

[0182] (Depth and width of the groove)

[0183] The magnetic domain control processing line 11 can also be a slot. The greater the depth and width of the slot, the better the effect of improving iron loss. On the other hand, the smaller the depth and width of the slot, the better the noise characteristics. The shape of the slot can be appropriately selected to correspond to the characteristics required by the oriented electromagnetic steel sheet 1.

[0184] There is no particular limitation on the depth of the groove; for example, it is preferably set to 5μm to 50μm. The depth of the groove can also be set to 6μm or more, 7μm or more, or 10μm or more. Alternatively, the depth of the groove can be set to less than 48μm, 45μm or less, or 40μm or less.

[0185] The width of the groove is not particularly limited; for example, it is preferably set to 10μm to 300μm. The groove width can also be specified as 20μm or more, 30μm or more, or 50μm or more. Alternatively, the groove width can be specified as 280μm or less, 250μm or less, or 200μm or less. The depth and width of the groove can be the same or uneven. In the case of unevenness, it is preferable that the average depth and width of multiple grooves fall within the above-mentioned range.

[0186] (Number of domain control points)

[0187] The more domain control points there are, the more domain control processing lines there are, and the wider the area treated by domain control. Therefore, from the viewpoint of reducing iron loss, a higher number of domain control points is preferable. For example, the preferred number of domain control points in the oriented electromagnetic steel sheet 1 is per 10,000 mm. 2 It can be 10 points or more, 50 points or more, or 100 points or more.

[0188] (Measurement Method)

[0189] The following describes the method for measuring various parameters of the orientation-oriented electromagnetic steel sheet 1 according to this embodiment. It should be noted that the measurement of any parameter is performed on a sample taken from the orientation-oriented electromagnetic steel sheet 1. For example, a rectangular sample with a length of 100 mm (or more) on both sides can be cut from the orientation-oriented electromagnetic steel sheet 1 for measurement. When the orientation-oriented electromagnetic steel sheet 1 is a roll, the sample can be taken from any part of the roll. Alternatively, when the orientation-oriented electromagnetic steel sheet 1 is a component assembled into a transformer, motor, or other motor product, the sample can be taken from any part of the component. When the component is small, the length of one side of the sample can be set to be less than 100 mm. In this case, the total area of ​​the sample is set to 10000 mm². 2 That concludes the above. At this point, to minimize the impact of mechanical strain and other factors on the specimen, it is preferable to obtain the specimen using methods such as wire cutting.

[0190] (Specific method of magnetic domain control processing line 11)

[0191] When the magnetic domain control processing line 11 is a slot, the magnetic domain control processing line 11 can be identified by visual inspection. When the oriented electromagnetic steel sheet 1 has an insulating film, the magnetic domain control processing line 11 can be visually identified by removing the insulating film using a known stripping agent.

[0192] When the domain control processing line 11 is subjected to thermal strain, it may sometimes be impossible to identify visually. In such cases, for example, using... Figure 6The image acquisition device 30, as illustrated, captures images of magnetic domains. As needed, a DC magnetic field is applied along the normal direction ND of the rolled surface of the oriented electromagnetic steel sheet 1 while capturing the magnetic domain images. By observing the magnetic domain images, the location of thermal strain can be determined.

[0193] (Specific methods for rolling direction RD and rolling right angle direction TD)

[0194] The rolling direction RD and the rolling right-angle direction TD of the orientation-oriented electromagnetic steel sheet 1 are specified by the means listed below.

[0195] (1) When the sample is cut from a coil of oriented electromagnetic steel sheet 1, the width direction of the coil is regarded as the rolling right-angle direction TD. In addition, the direction perpendicular to the rolling right-angle direction TD and the rolling surface normal direction ND is regarded as the rolling direction RD.

[0196] (2) In the case where the sample is cut from a component of an electric motor product, the rolling direction RD and the rolling right-angle direction TD are determined based on the rolling marks on the surface of the oriented electromagnetic steel sheet 1. The direction of extension of the rolling marks is regarded as the rolling direction RD. The direction perpendicular to the rolling direction RD and the normal direction ND of the rolling surface is regarded as the rolling right-angle direction TD.

[0197] (3) When it is difficult to specify the rolling direction RD and the rolling right-angle direction TD based on the surface marks of the oriented electromagnetic steel sheet 1, the rolling direction RD and the rolling right-angle direction TD are specified based on the crystal orientation of the oriented electromagnetic steel sheet 1. Specifically, the crystal orientation of the oriented electromagnetic steel sheet 1 to be evaluated is measured at multiple points. Moreover, the easy magnetization axis at which the crystal orientation at the measurement point forms an angle with the normal direction ND (thickness direction) of the rolling surface is closest to a right angle is selected. <001> The direction with the smallest offset angle is considered as the rolling direction RD, and the direction perpendicular to the rolling direction RD and the normal direction ND of the rolling surface is considered as the rolling right-angle direction TD.

[0198] (Method for measuring the β angle)

[0199] The β angle is determined using the side reflection Laue method. The side reflection Laue method is widely known as a method for determining crystal orientation. The β angle is obtained by rounding the measured value to the second decimal place. That is, the significant figures of the β angle are set to the first decimal place.

[0200] (|β) All | Calculation method)

[0201] |β All The calculation method for | is summarized below. For example... Figure 13As illustrated, measurement points are set in a grid pattern on the surface of a sample taken from the oriented electromagnetic steel sheet 1. The absolute value of the angle β is measured at each measurement point, and their average value is calculated. This average value is considered as |β... All |

[0202] Specifically, for samples with one side length greater than 100 mm ( Figure 13 An imaginary line VL1 parallel to the rolling right-angle direction TD and an imaginary line VL2 parallel to the rolling direction RD are set on the surface of a rectangular area (enclosed by a single-dotted line). The presence of the magnetic domain control processing line 11 is not considered when setting the imaginary lines VL1 and VL2. The spacing between the imaginary lines VL1 and VL2 is 2 mm. The imaginary lines VL1 and VL2 are arranged across the entire surface of the sample. The absolute value of the angle β at the intersection point VP1 of the imaginary lines VL1 and VL2 is measured.

[0203] (|β) Dr | Calculation method)

[0204] |β Dr The calculation method for | is as follows. First, for a sample with one side greater than 100mm ( Figure 1 or Figure 2 On the surface of the rectangular area (enclosed by a single-dot dashed line), multiple imaginary lines VL3 are set at regular intervals parallel to the rolling direction RD of the oriented electromagnetic steel sheet 1. It should be noted that VL3 and |β... All The imaginary line VL2 parallel to the rolling direction RD used in the calculation can be the same or different. The spacing of the imaginary lines VL3 is 2 mm. The imaginary lines VL3 are arranged across the entire surface of the sample. Next, specific domain control points VP2 (i.e., the intersection of the imaginary line VL3 and the domain control treatment line 11) are determined. Then, the absolute value of the β angle of each domain control point VP2 is measured, and their average value is calculated. This average value is considered as |β Dr The specific methods for the rolling direction RD and the magnetic domain control processing line 11, and the method for measuring the β angle are as described above.

[0205] (σ) All (Determination method)

[0206] σ All By calculating |β All The β angle is calculated using the standard deviation of the absolute value of the β angle at each measurement point. The specific method for calculating the absolute value of the β angle at each measurement point is as described above.

[0207] (σ) Dr (Determination method)

[0208] σ DrThe β angle of each domain control point VP2 is determined by calculating the standard deviation of its absolute value. The specific method for determining the domain control point VP2 is as described above.

[0209] (Method for determining the chemical composition of original plate 2 and oriented electromagnetic steel plate 1)

[0210] The chemical composition of the orientation-oriented electromagnetic steel sheet 1 and the original sheet 2 can be determined using general analytical methods for steel. For example, the chemical composition can be determined using ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry). Specifically, a test piece is taken from the center of the sample along its thickness direction, and the chemical composition of the orientation-oriented electromagnetic steel sheet 1 and the original sheet 2 can be determined using a Shimadzu ICPS-8100 (measuring device) under conditions based on a pre-prepared standard curve. The contents of C and S, which are difficult to determine in ICP-AES, can be determined using the combustion-infrared absorption method. The N content can be determined using the inactive gas melting-thermal conductivity method.

[0211] When a magnesium olivine coating and / or an insulating coating are formed on the oriented electromagnetic steel sheet 1 and the original sheet 2, the chemical composition of the oriented electromagnetic steel sheet 1 and the original sheet 2 can be analyzed after removing the magnesium olivine coating and / or the insulating coating from the oriented electromagnetic steel sheet 1 and the original sheet 2.

[0212] For example, forsterite coatings can be removed by immersing the sample in sulfuric acid followed by nitric acid. Appropriate adjustments to the temperature and concentration of the sulfuric and nitric acids, as well as the immersion time, are necessary to prevent excessive dissolution of the iron-based components in the sample. An example of the conditions for removing forsterite coatings is as follows: First, immerse the sample in 10% sulfuric acid at 80°C for 3 minutes. Then, wash the surface of the sample with water using a rag or similar material to remove any adhering residue. Next, allow the sample to dry. Then, immerse the sample in 10% nitric acid at room temperature for approximately 5 seconds while stirring.

[0213] Insulating coatings can be removed, for example, by immersing the sample in a sodium hydroxide solution, followed by immersion in dilute sulfuric acid and nitric acid. It should be noted that the temperature and concentration of the sodium hydroxide, dilute sulfuric acid, and nitric acid solutions, as well as the immersion time, should be appropriately adjusted to prevent excessive dissolution of the iron-based components of the sample. An example of the conditions for removing the insulating coating is as follows: First, immerse the sample in a 20% sodium hydroxide solution at 80°C for 15 minutes. Then, allow the sample to dry. Next, immerse the sample in a 10% dilute sulfuric acid solution at 80°C for 4 minutes. Then, remove any residue adhering to the sample surface with a rag or similar cloth. Finally, immerse the sample in a 10% nitric acid solution at room temperature for approximately 10 seconds while stirring.

[0214] (Method for determining the angle between the magnetic domain control processing line 11 and the rolling right-angle direction TD)

[0215] The angle between the domain control processing line 11 and the rolling right-angle direction TD can be measured using a known angle measurement method after specifying the domain control processing line 11 and the rolling right-angle direction TD in the above order.

[0216] (Method for measuring the spacing of the magnetic domain control processing line 11 along the rolling direction RD)

[0217] The spacing of the domain control processing line 11 along the rolling direction RD can be measured using known length measurement methods after specifying the domain control processing line 11 and the rolling direction RD in the order described above.

[0218] (Method for determining the magnitude of tensile stress introduced into thermal strain)

[0219] The magnitude of the tensile stress introduced in the thermal strain was determined using the EBSD Wilkinson method and the Cross Court manufactured by BLG Vantage. The EBSD Wilkinson method is described in detail in AJ Wilkinson, et al. "High-resolution elastic strain measurement from electron backscatter diffraction patterns: New levels of sensitivity" Ultramicroscopy Vol 106, No.4-5, March 2006, pp.307-313.

[0220] When determining the magnitude of tensile stress introduced by thermal strain using the EBSD Wilkinson method and a Cross Court manufactured by BLG Vantage, the domain control processing line 11 is first specified according to the steps described above. Next, the orientation-type electromagnetic steel sheet 1 is cut through the domain control processing line 11 and perpendicular to it. This cut surface is used as the measurement surface. For the cross-section of the domain control processing line 11 included in the measurement surface, analysis is performed using the EBSD Wilkinson method and a Cross Court manufactured by BLG Vantage to extract the tensile stress components relative to any direction and determine their magnitude. For example, tensile stress components in the rolling surface normal direction ND, the direction parallel to the domain control processing line 11, and the directions perpendicular to both the rolling surface normal direction ND and the domain control processing line 11 can be extracted.

[0221] The number of measurement sites is, for example, 10. If, at least one site on the orientation-oriented electromagnetic steel sheet 1, the tensile stress in any direction is 40 MPa or more (i.e., the tensile stress in at least one direction is 40 MPa or more), it is determined that the maximum value of the tensile stress in any direction within the magnetic domain control processing lines of the orientation-oriented electromagnetic steel sheet 1 is 40 MPa or more. Therefore, if the purpose is to determine whether the maximum value of the tensile stress is 40 MPa or more, the measurement of the tensile stress can be stopped when a measurement point where the tensile stress in any direction is found to be 40 MPa or more. However, after calculating σ(TS) as described later... m ) 2 TS m（β<2） or TS m（β≥2） In the case of [unspecified condition], the measurement is not interrupted, and the tensile stress at each measurement point is calculated.

[0222] (Methods for measuring the depth and width of the groove)

[0223] The depth and width of the groove can be determined by using a known three-dimensional measuring machine to measure the surface shape of a specific sample. In the case where the oriented electromagnetic steel sheet 1 has a tension insulating film, the three-dimensional measurement of the sample surface is performed after removing the insulating film according to the steps described above.

[0224] Preferably, in the oriented electromagnetic steel sheet of this embodiment, the magnetic domain control intensity in the magnetic domain control processing area is made non-uniform. The magnetic domain control intensity, when the means of magnetic domain control is thermal strain 541, is the maximum value of the tensile strength of the introduced thermal strain 541, and when the means of magnetic domain control is groove 542, it is the maximum value of the depth of groove 542.

[0225] "The maximum tensile strength under thermal strain 541" refers to the maximum tensile strength measured in an arbitrary cross-section. It should be noted that the magnitude and direction of the tensile strength are not uniform within a single cross-section; therefore, a specific "maximum tensile strength under thermal strain 541" is required for each cross-section. Figure 17 As schematically shown, the thermal strain 541 exhibits a certain degree of expansion within the cross-section. The tensile strength is highest at the location directly irradiated by the laser, and lowest at locations farther away. That is, the measured value of the tensile strength differs at each measurement location and in each measurement direction within the cross-section. Based on the tensile strength measurement method described later, the distribution and maximum value of the tensile strength within the cross-section can be derived.

[0226] When the magnetic domain control intensity is uniform, the maximum value of the tensile strength introduced by the thermal strain 541 becomes constant throughout the entire magnetic domain subdivision processing line 54. On the other hand, when the magnetic domain control intensity is non-uniform, the maximum value of the tensile strength introduced by the thermal strain in the magnetic domain subdivision processing line is not uniform at each tensile strength measurement point. Hereinafter, the maximum value of the tensile strength introduced by the thermal strain will sometimes be simply referred to as "tensile strength".

[0227] "The maximum depth of groove 542" refers to the maximum depth of groove 542 at an arbitrary measurement point, determined by the method described later. For example... Figure 18 As illustrated, the depth of groove 542 varies at a single measurement point. Generally, the depth of the groove decreases as it approaches the edge. Therefore, for a given measurement section, a specific "maximum depth of groove 542" is defined.

[0228] When the domain control intensity is uniform, the maximum value of the depth of the slot 542 becomes constant throughout the entire domain subdivision processing line 54. On the other hand, when the domain control intensity is non-uniform, the maximum value of the depth of the slot 542 in the domain subdivision processing line is not uniform at the measurement points of the depth of each slot. Hereinafter, the maximum value of the depth of the slot 542 will sometimes be simply referred to as the "depth of the slot".

[0229] As described above, the domain control saturation intensity is high in regions with a small β angle. Preferably, domain control processing with high intensity is performed in regions with a small β angle, and domain control processing with low intensity is performed in regions with a large β angle. This results in a non-uniform domain control intensity in the oriented electromagnetic steel sheet where the optimal domain control intensity is selected based on the size of the β angle. In domain control processing lines located in regions with large β angles, the grooves are shallow, or the tensile strength inducing thermal strain is low. In domain control processing lines located in regions with small β angles, the grooves are deep, or the tensile strength inducing thermal strain is high. In such an oriented electromagnetic steel sheet, the iron loss of the oriented electromagnetic steel sheet after domain control is further reduced. Furthermore, the increase in hysteresis loss and the deterioration of noise characteristics in the oriented electromagnetic steel sheet after domain control are further suppressed.

[0230] When the magnetic domain control processing line is thermal strain, the orientation-oriented electromagnetic steel sheet preferably satisfies σ. 2 (TS) m >5.0. Here, TS m σ is the tensile strength measured in MPa, incorporating thermal strain, at the intersections of multiple imaginary lines VL3 and magnetic domain control processing lines (i.e., multiple magnetic domain control points). 2 (TS) m ) is TS m The variance.

[0231] In satisfying σ 2 (TS) m When the magnetic domain control strength is greater than 5.0, the magnetic domain control strength changes based on the size of the magnetic domain width or the size of the β angle. The increase in hysteresis loss and the deterioration of noise characteristics of the orientation electromagnetic steel sheet after magnetic domain control are further suppressed.

[0232] TS m and σ 2 (TS) m For example, a method for determining ) Figure 19 As shown. Figure 19 The dashed line in the diagram is the imaginary line VL3. Figure 19 The X and O markings represent the intersections of the imaginary line VL3 and the thermal strain 541, which serves as the magnetic domain control processing line. It should be noted that the β angle at the location marked with an X is β... Dr Above, the β angle of the area marked with O is less than β. Dr However, in σ 2 (TS) m When calculating , the β angle at the intersection point does not need to be considered.

[0233] First, the intersection of the specific imaginary line VL3 and the thermal strain 541, which serves as the magnetic domain control processing line, is determined. When the thermal strain 541 is not visually discernible to the naked eye, it is determined based on the magnetic domain image. It should be noted that the shape of the measurement area is preferably a rectangle with a size of 100 mm or more along the rolling direction RD and a size of 100 μm or more along the rolling perpendicular direction TD. One side of the rectangle is preferably parallel to the rolling direction RD.

[0234] Then, measure σm at all intersection points in the measurement area and calculate the variance σm. 2 (TS) m ).

[0235] The maximum value of the specific tensile strength TS at multiple measurement points. M variance σ 2 (TS) M The population variance was derived according to the method described in paragraph 2.36 of JIS Z8101-1:2015, “Statistics – Terms and Symbols – Part 1: Terms and Symbols for General Statistics and Terms for Using the Accuracy Rate”.

[0236] Alternatively, when the magnetic domain control processing line is thermal strain, the orientation-oriented electromagnetic steel sheet preferably meets the TS requirement. m（β<βDr） >TS m（β≥βDr） TS m（β<βDr）In the case of multiple imaginary lines VL3 set parallel to the rolling direction of the oriented electromagnetic steel sheet at 2mm intervals, the intersection point of these lines and the domain control processing line, i.e., the multiple domain processing points, is where the angle β is less than β. Dr The arithmetic mean of the maximum tensile strength (in MPa) measured at each of the magnetic domain treatment points and subjected to thermal strain. TS m（β≥βDr） At angle β Dr The arithmetic mean of the maximum tensile strength measured at the above magnetic domain treatment points, in units of MPa, after inducing thermal strain.

[0237] In compliance with TS m（β<βDr） >TS m（β≥βDr） In this case, the domain control strength is greater where the β angle is small and weaker where the β angle is large. Therefore, the iron loss of the orientation-oriented electromagnetic steel sheet is further reduced after domain control. On the other hand, it further suppresses the increase in hysteresis loss and the deterioration of noise characteristics of the orientation-oriented electromagnetic steel sheet after domain control.

[0238] On the other hand, when the magnetic domain control processing line is slot 542, it is preferable that the orientation-oriented electromagnetic steel plate satisfies σ. 2 (D) m >3.0. Dm is the depth of the slot 542, measured in μm, at the intersection of multiple imaginary lines VL3 and the domain control processing line, i.e., the domain control point. σ 2 (D) m ) is D m The variance.

[0239] In satisfying σ 2 (D) m When the magnetic domain control strength is greater than 3.0, the magnetic domain control strength changes based on the size of the magnetic domain width or the size of the β angle. The increase in hysteresis loss and the deterioration of noise characteristics of the orientation electromagnetic steel sheet after magnetic domain control are further suppressed.

[0240] D m and σ 2 (D) m For example, a method for determining ) Figure 20 As shown. Figure 20 The dashed lines in the diagram are multiple imaginary lines VL3 set at 2mm intervals parallel to the rolling direction RD of the oriented electromagnetic steel sheet. Figure 20 The X and O markings represent the intersections of the imaginary line VL3 and the slot 542, which serves as the magnetic domain control processing line. It should be noted that the β angle at the location marked with an X is β... Dr Above, the β angle of the area marked with O is less than β. Dr However, in σ 2 (D) m When calculating , the β angle at the intersection point does not need to be considered.

[0241] First, the intersection of the specific imaginary line VL3 and the domain control processing line. When the domain control processing line cannot be visually identified, it is determined based on the domain image. When the domain subdivision processing line is slot 542, it is easily visually identified. It should be noted that the shape of the measurement area is preferably a rectangle with a size of 100 mm or more along the rolling direction RD and a size of 100 mm or more along the rolling perpendicular direction TD. One side of the rectangle is preferably parallel to the rolling direction RD.

[0242] Then, the maximum value D of the groove depth at all intersections in the measurement area is measured. m Calculate the maximum value D of the groove depth. m variance σ 2 (D) m The method for determining the maximum depth Dm of the groove is as follows. Measurements were performed using a Bruker Controll GT-I white light interferometer. The lens used was a 5x objective lens (0.12 apertures, 2.2μm optical resolution) and a 1x internal lens. A white LED was used as the light source, and a monochrome CCD (1200×1000 pixels) was used as the camera. The pixel size was set to 1.37μm. Using Vision64 Map Premium 9.2 software, after tilt correction based on the least squares plane, a Goss filter with a cutoff of 2.5mm was used to remove long-wavelength fluctuations before analysis. It should be noted that the pixel size can be resampled to 10μm as needed during analysis. Furthermore, areas clearly identified as outliers can be excluded from the analysis. Depending on the characteristics of the sample, the type of lens, filter value, and correction method can be changed. It should be noted that although grooves are formed on the oriented electromagnetic steel plate, when it is impossible to measure the surface irregularities using methods such as insulating coatings, the above measurements were performed by removing the insulating coating using known methods.

[0243] Alternatively, when the magnetic domain control processing line is slot 542, the orientation-oriented electromagnetic steel sheet preferably satisfies D. m（β<βDr） >D m（β≥βDr） D m（β<βDr） In the case of multiple imaginary lines VL3 set parallel to the rolling direction of the oriented electromagnetic steel sheet at 2mm intervals, the intersection point of these lines and the domain control processing line, i.e., the multiple domain control points, is where the angle β is less than β. Dr The arithmetic mean of the maximum values ​​of the groove depth measured in μm at each of the magnetic domain control points. D m（β≥βDr） At angle β Dr The arithmetic mean of the maximum values ​​of the groove depth measured in μm at each of the above magnetic domain control points.

[0244] In the domain control processing line that satisfies this formula, the domain control strength is high where the β angle is small and low where the β angle is large. Therefore, the iron loss of the orientation-oriented electromagnetic steel sheet is further reduced after domain control. On the other hand, it further suppresses the increase in hysteresis loss and the deterioration of noise characteristics of the orientation-oriented electromagnetic steel sheet after domain control.

[0245] Figure 20 TS m (β<2) and TS m An example of a method for determining (β≥2). As described above, Figure 20 The X and O markings represent the intersections of the imaginary line VL3 and the slot 542, which serves as the magnetic domain control processing line. The β angle at the location marked with an X is β... Dr Above, the β angle of the area marked with O is less than β. Dr .

[0246] First, by measuring the β angle at the intersection point, a specific β angle is defined as β. Dr The intersection points and angle β above are less than β. Dr The intersection point. Next, calculate angle β as β Dr D at all the above intersection points m The arithmetic mean of D is taken as D. m（β≥βDr） Furthermore, calculate that angle β is less than β. Dr D at all intersections m The arithmetic mean of D is taken as D. m（β≥βDr） The maximum depth D of the groove at the intersection. m The determination method is as described above.

[0247] Example

[0248] The effects of one aspect of this disclosure are further illustrated through the examples. However, the conditions in the examples are merely examples used to confirm the feasibility and effects of implementing this disclosure. This disclosure is not limited to this single example of conditions. Various conditions can be used to achieve the purpose of this disclosure as long as they do not depart from its main theme.

[0249] (First embodiment)

[0250] The same batch of oriented electromagnetic steel sheets, classified as 23P085 in Table 2 of JIS C 2553:2019 "Oriented Electromagnetic Steel Strip" and with a thickness of 0.23 mm, were used as the base sheets. Magnetic domain control treatment was performed on the base sheets under the various conditions shown in Table 1. The noise and iron loss of the oriented electromagnetic steel sheets after the magnetic domain control treatment were evaluated and recorded in Table 2. In Table 1, values ​​outside the range of the oriented electromagnetic steel sheets of this embodiment are underlined. In Table 2, values ​​that do not meet the following acceptance / disacquisition criteria are underlined.

[0251] The evaluation method for noise and transformer iron loss W16 / 50 is as follows. Hereinafter, transformer iron loss W16 / 50 will be simply referred to as iron loss. First, 180 sheets of 0.23mm thick oriented electromagnetic steel plates were stacked to fabricate a three-phase transformer core. The width of the legs and yoke of the three-phase transformer core was 150mm. The height and width of the three-phase transformer core were both 750mm. The noise and iron loss of these three-phase transformer cores were measured. The measurement conditions were set to a frequency of 60Hz and an excitation flux density of 1.5T.

[0252] During noise measurement, microphones were placed at equal intervals at eight locations around the transformer where the three-phase transformer core was assembled. The distance between the transformer and the microphones was set to 30 cm. The noise measurement results from these microphones were corrected for A-characteristics and averaged to obtain the noise evaluation results (in dBA) for the oriented electromagnetic steel sheet, and are recorded in Table 2. Examples with noise evaluation results below 30.50 dBA were considered to have achieved low noise. Noise evaluation results deemed unacceptable were underlined.

[0253] As described above, the iron loss was determined by measuring the voltage and current on the primary and secondary sides using a power analyzer when excitation was performed at a frequency of 60 Hz and an excitation flux density of 1.5 T. The calculated iron loss was recorded as the iron loss evaluation result (unit: W / kg) for the three-phase transformer in Table 2. Examples with an iron loss evaluation result of 0.850 W / kg or less were considered to have achieved low iron loss. Noise evaluation results deemed unqualified were underlined.

[0254] Furthermore, the |β| in the oriented electromagnetic steel sheet after the magnetic domain control treatment was measured. All |、|β Dr |、σ All and σ Dr The results are recorded in Table 2. The measurement method generally follows the steps described above. A rectangular sample with two sides measuring 100 mm was cut from the core of the three-phase transformer used for noise and iron loss measurements for testing.

[0255]

[0256]

[0257] In Example 10, all magnetic domain control lines are formed across the entire width of the orientation-grade electromagnetic steel sheet. As a result, Example 10 does not satisfy |β All |-|β Dr |≥0.1°. In example number 10, the iron loss is within the acceptable range, but the noise characteristics are unacceptable.

[0258] In Example 11, the domain control processing lines are formed as dashed lines. That is, in Example 11, regions where no domain control processing is performed are set up in the same way as in Examples 1-9. However, in Example 11, the gaps between the domain control processing lines contained in the dashed lines are randomly distributed. The regions where no domain control processing is performed are randomly set without considering the distribution of domain widths in the domain image. As a result, Example 11 does not satisfy |β All |-|β Dr |≥0.1°. In example number 11, the iron loss is within the acceptable range, but it is the same as the acceptable threshold of 0.850. Additionally, in example number 11, the noise characteristics are unacceptable.

[0259] In Example 12, the domain control processing lines are formed as regularly spaced dashed lines. That is, in Example 12, regions without domain control processing are set up in the same way as in Examples 1-9. However, in Example 12, the gap between the domain control processing lines contained within the dashed lines is set to a constant value. The regions without domain control processing are set up regularly without considering the distribution of domain widths in the domain image. As a result, Example 12 does not satisfy |β All |-|β Dr |≥0.1°. In example number 12, both iron loss and noise characteristics are non-compliant.

[0260] In examples 13 and 14, magnetic domain control was specifically applied to regions with large β angles. These examples also do not satisfy |β All |-|β Dr |≥0.1°. In examples 13 and 14, the iron loss is unacceptable.

[0261] On the other hand, in Examples 1-9, magnetic domain control processing is applied to the magnetic domain control processing region (the region with a small β angle) defined by the distribution of magnetic domain width. Examples 1-9 satisfy |β All |-|β Dr |≥0.1°, both noise characteristics and iron loss are within acceptable ranges. Through examples 1~9, both low iron loss and low noise were achieved.

[0262] It should be noted that, based on examples 1-9, we can confirm that |β All |-|β Dr The larger the value of |β, the better the noise characteristics. Furthermore, in examples 6-9, the condition |β| is satisfied. All |-|β Dr |>σ All / 2. In Example 9, σ is satisfied. Dr <σ All In these examples, noise characteristics and iron losses are further improved.

[0263] (Second embodiment) To evaluate the properties of orientation-oriented electromagnetic steel sheets with non-uniform magnetic domain control strength, the following experiments were conducted. It should be noted that in all examples, |β... All |-|β Dr |≥0.1°.

[0264] Magnetic domain control treatment was applied to the original sheet under various conditions. The noise and iron loss of the resulting magnetic domain control-treated oriented electromagnetic steel sheet were evaluated and are recorded in Tables 3 and 4 along with the conditions. It should be noted that the original sheet used was an oriented electromagnetic steel sheet from the same batch, classified as 23P085 in Table 2 of JISC 2553:2019 "Oriented Electromagnetic Steel Strip", with a sheet thickness of 0.23 mm.

[0265] The methods for measuring and evaluating noise and iron loss are the same as in Example 1.

[0266]

[0267] Example number A1 satisfies |β All |-|β Dr |≥0.1, thus showing better iron loss and noise evaluation results than previous oriented electromagnetic steel sheets.

[0268] On the other hand, example number A2, besides satisfying |β All |-|β Dr Beyond ≥0.1, the maximum tensile strength of the amount of thermal strain introduced in the magnetic domain control processing line is not uniform across the various tensile strength measurement points. For example, the evaluation results for iron loss and noise in example A2 are even better than those in example A1.

[0269] Example number A3, besides satisfying |β All |-|β Dr |Except for ≥0.1, the maximum value of the tensile strength of the amount of thermal strain introduced in the magnetic domain control processing line is not uniform at each tensile strength measurement point, thus satisfying σ 2 (TS) m The iron loss and noise evaluation results for example A3 are even better than those for A1 and A2.

[0270] Example number A4, besides satisfying |β All |-|β Dr Beyond ≥0.1, the maximum tensile strength of the amount of thermal strain introduced in the magnetic domain control processing line is not uniform at each tensile strength measurement point, thus satisfying TS. m（β<βDr） >TS m（β≥βDr） For example, in the evaluation results of iron loss and noise in example A4, at least one of the ratios in examples A1 and A2 is even better.

[0271] Example number A5, besides satisfying |β All |-|β Dr |Except for ≥0.1, the maximum value of the tensile strength of the amount of thermal strain introduced in the magnetic domain control processing line is not uniform at each tensile strength measurement point, thus satisfying σ 2 (TS) m >5.0 and TS m（β<βDr） >TS m（β≥βDr） For example, in the evaluation results of iron loss and noise, number A5, at least one of the ratios in numbers A1 to A5 is even better.

[0272] Example number A6, besides satisfying |β All |-|β Dr |Except for ≥0.1, the maximum value of the tensile strength of the amount of thermal strain introduced in the magnetic domain control processing line is not uniform at each tensile strength measurement point, satisfying |β All |-|β Dr |>σ All / 2. The evaluation results for iron loss and noise in example A6 are even better than those in A1 and A2.

[0273] Example number A7, besides satisfying |β All |-|β Dr |Except for ≥0.1, the maximum value of the tensile strength of the amount of thermal strain introduced in the magnetic domain control processing line is not uniform at each tensile strength measurement point, except for satisfying σ 2 (TS) m In addition to being greater than 5.0, it also satisfies |β All |-|β Dr |>σ All / 2. The evaluation results for iron loss and noise in example A7 are even better than those in examples A1~A3 and A6.

[0274] Example number A8, besides satisfying |β All |-|β Dr |Except for ≥0.1°, the maximum value of the tensile strength of the amount of thermal strain introduced in the magnetic domain control processing line is not uniform at each tensile strength measurement point, except for satisfying TS m（β<βDr） >TS m（β≥βDr） In addition, it also satisfies |β All |-|β Dr |>σ All / 2. For example, in the evaluation results of iron loss and noise in example A8, at least one of the ratios in examples A1 to A4 and A6 is even better.

[0275] Example number A9, besides satisfying |β All |-|β Dr|Except for ≥0.1°, the maximum value of the tensile strength of the amount of thermal strain introduced in the magnetic domain control processing line is not uniform at each tensile strength measurement point, except for satisfying σ 2 (TS) m >5.0 and TS m（β<βDr） >TS m（β≥βDr） In addition, it also satisfies |β All |-|β Dr |>σ All / 2. The evaluation results for iron loss and noise in example A9 are even better than those in A1~A5 and A6~A8.

[0276] Example number A10, besides satisfying |β All |-|β Dr |Except for ≥0.1, the maximum value of the tensile strength of the amount of thermal strain introduced in the magnetic domain control processing line is not uniform at each tensile strength measurement point, satisfying σ Dr <σ All The evaluation results for iron loss and noise in example A10 are even better than those in examples A1 and A2.

[0277] Example number A11, besides satisfying |β All |-|β Dr |Except for ≥0.1, the maximum value of the tensile strength of the amount of thermal strain introduced in the magnetic domain control processing line is not uniform at each tensile strength measurement point, except for satisfying σ 2 (TS) m In addition to being greater than 5.0, it also satisfies σ. Dr <σ All For example, in the evaluation results of iron loss and noise of example A11, at least one of the ratios of A1~A3 and A10 is even better.

[0278] Example number A12, besides satisfying |β All |-|β Dr |Except for ≥0.1°, the maximum value of the tensile strength of the amount of thermal strain introduced in the magnetic domain control processing line is not uniform at each tensile strength measurement point, except for satisfying TS m（β<βDr） >TS m（β≥βDr） In addition, it also satisfies σ Dr <σ All For example, in the evaluation results of iron loss and noise of example A12, at least one of the ratios of A1~A4 and A10 is even better.

[0279] Example number A13, besides satisfying |β All |-|β Dr |Except for ≥0.1°, the maximum value of the tensile strength of the amount of thermal strain introduced in the magnetic domain control processing line is not uniform at each tensile strength measurement point, except for satisfying σ 2 (TS)m >5.0 and TS m（β<βDr） >TS m（β≥βDr） In addition, it also satisfies σ Dr <σ All For example, in the evaluation results of iron loss and noise of example A13, at least one of the ratios of A1~A5 and A10~A12 is even better.

[0280] Example number A14, besides satisfying |β All |-|β Dr |Except for ≥0.1°, the maximum value of the tensile strength of the amount of thermal strain introduced in the magnetic domain control processing line is not uniform at each tensile strength measurement point, except for satisfying σ 2 (TS) m >5.0 and TS m（β<βDr） >TS m（β≥βDr） In addition, it also satisfies |β All |-|β Dr |>σ All / 2 and σ Dr <σ All The evaluation results for iron loss and noise in example A14 are the best among examples A1 to A14.

[0281]

[0282] Example number B1 satisfies |β All |-|β Dr |≥0.1°, thus showing better iron loss and noise evaluation results than previous orientation-oriented electromagnetic steel sheets.

[0283] Example number B2, besides satisfying |β All |-|β Dr Beyond 0.1°, the maximum depth of the grooves in the magnetic domain control processing line is not uniform at the measurement points of each groove. Example B2 shows a further superior evaluation result for iron loss and noise compared to example B1.

[0284] Example number B3, besides satisfying |β All |-|β Dr |Except for ≥0.1°, the maximum depth of the grooves in the magnetic domain control processing line is not uniform at the measurement points of each groove, thus satisfying σ 2 (D) m The iron loss and noise evaluation results for example B3 are even better than those for B1 and B2.

[0285] Example number B4, besides satisfying |β All |-|β Dr|Except for ≥0.1°, the maximum depth of the grooves in the magnetic domain control processing line is not uniform at the measurement points of each groove, thus satisfying D m（β<βDr） >D m（β≥βDr） For example, the evaluation results for iron loss and noise in example B4 are even better than those in examples B1 and B2.

[0286] Example number B5, besides satisfying |β All |-|β Dr |Except for ≥0.1°, the maximum depth of the grooves in the magnetic domain control processing line is not uniform at the measurement points of each groove, thus satisfying σ 2 (D) m >3.0 and D m（β<βDr） >D m（β≥βDr） The evaluation results for iron loss and noise in example B5 are the best among examples B1 to B5.

[0287] Example number B6, besides satisfying |β All |-|β Dr |Beyond ≥0.1°, the maximum depth of the grooves in the magnetic domain control processing line is not uniform at the measurement points of each groove, satisfying |β All |-|β Dr |>σ All / 2. The evaluation results for iron loss and noise in example B6 are even better than those in B1 and B2.

[0288] Example number B7, besides satisfying |β All |-|β Dr |Except for ≥0.1°, the maximum depth of the grooves in the magnetic domain control processing line is not uniform at the measurement points of each groove, except for satisfying σ 2 (D) m In addition to being greater than 3.0, it also satisfies |β All |-|β Dr |>σ All / 2. The evaluation results for iron loss and noise in example B7 are even better than those in B1, B2, and B6.

[0289] Example number B8, besides satisfying |β All |-|β Dr |Except for ≥0.1°, the maximum depth of the grooves in the magnetic domain control processing line is not uniform at the measurement points of each groove, except for satisfying D m（β<βDr） >D m（β≥βDr） In addition, it also satisfies |β All |-|β Dr |>σ All / 2. The evaluation results of iron loss and noise in example B8 are even better than those in B1, B2, and B6.

[0290] Example number B9 not only satisfies |β All |-|β Dr |≥0.1°, and the maximum value of the depth of the groove in the magnetic domain control processing line is not uniform at the measurement points of each groove, except for satisfying σ 2 (D) m >3.0 and D m（β<βDr） >D m（β≥βDr） In addition, it also satisfies |β All |-|β Dr |>σ All / 2. For example, in the evaluation results of iron loss and noise of B9, at least one of them is better than that of B1~B5 and B6~B8.

[0291] Example number B10, besides satisfying |β All |-|β Dr |Except for ≥0.1°, the maximum depth of the grooves in the magnetic domain control processing line is not uniform at the measurement points of each groove, satisfying σ Dr <σ All The evaluation results for iron loss and noise in example B10 are even better than those in B1 and B2.

[0292] Example number B11, besides satisfying |β All |-|β Dr |Except for ≥0.1°, the maximum depth of the grooves in the magnetic domain control processing line is not uniform at the measurement points of each groove, except for satisfying σ 2 (D) m In addition to being greater than 3.0, it also satisfies σ. Dr <σ All For example, in the evaluation results of iron loss and noise of example B7, at least one of the ratios of B1, B2, and B10 is even better.

[0293] Example number B12, besides satisfying |β All |-|β Dr |Except for ≥0.1°, the maximum depth of the grooves in the magnetic domain control processing line is not uniform at the measurement points of each groove, except for satisfying D m（β<βDr） >D m（β≥βDr） In addition, it also satisfies σ Dr <σ All For example, the evaluation results for iron loss and noise of sample B12 are even better than those of samples B1, B2, and B10.

[0294] Example number B13, besides satisfying |β All |-|β Dr |Except for ≥0.1°, the maximum depth of the grooves in the magnetic domain control processing line is not uniform at the measurement points of each groove, except for satisfying σ2 (D) m >3.0 and D m（β<βDr） >D m（β≥βDr） In addition, it also satisfies σ Dr <σ All For example, in the evaluation results of iron loss and noise of B13, at least one of them is better than that of B1~B5 and B10~B12.

[0295] Example number B14, besides satisfying |β All |-|β Dr |Except for ≥0.1°, the maximum depth of the grooves in the magnetic domain control processing line is not uniform at the measurement points of each groove, except for satisfying σ 2 (D) m >3.0 and D m（β<βDr） >D m（β≥βDr） In addition, it also satisfies |β All |-|β Dr |>σ All / 2 and σ Dr <σ All Example B14 has the best iron loss and noise evaluation results among B1~B14.

[0296] Explanation of reference numerals in the attached figures 1. Oriented Electromagnetic Steel Sheet 11 Magnetic Domain Control Processing Line 12A Region with small β angle 12B Region with large β angle RD rolling direction TD rolling right-angle direction ND (Normal direction of the rolled surface) VL1 |β All |Imaginary line parallel to TD used for calculation VL2 |β All |Imaginary line parallel to RD used for calculation VL3 |β Dr |Imaginary line parallel to TD used for calculation VP1 is the intersection of imaginary lines VL1 and VL2. VP2 domain control point 2 original boards 21 Magnetic domain control processing area 22 Non-magnetic domain control processing region 30 Image Acquisition Device 31 Light Source Section 33 MO sensor 35 Image Sensor 37. Signal Processing Department 40 Analysis device 41. Arithmetic Unit 43 Memory 45 Display Section 47 Input Section 49 Communication I / F 500 laser irradiation device 501 Multifaceted Mirror 503 Light Source Device 505 Collimator 507 Condensing Lens 509 motor 511 sensor 513 Control Department 515 Through-plate device

Claims

1. A type of oriented electromagnetic steel sheet, wherein the oriented electromagnetic steel sheet has magnetic domain control treatment lines on its surface. It satisfies |β All |-|β Dr |≥0.1°, |β All | is the average absolute value of the β angle across the entire surface of the oriented electromagnetic steel sheet. |β Dr | is the average value of the absolute value of the angle β at the intersection point of multiple imaginary lines set parallel to the rolling direction of the oriented electromagnetic steel sheet at 2mm intervals and the magnetic domain control processing line, i.e., the magnetic domain control point.

2. The orientation-oriented electromagnetic steel sheet according to claim 1, which satisfies |β All |-|β Dr |≥0.2°.

3. The orientation-oriented electromagnetic steel sheet according to claim 1, which satisfies |β All |-|β Dr |≥0.5°.

4. The orientation-oriented electromagnetic steel sheet according to claim 1, which satisfies |β All |-|β Dr |≥1.0°.

5. The orientation-grade electromagnetic steel sheet according to any one of claims 1 to 4, It satisfies |β All |-|β Dr |>σ All / 2, σ All It is the standard deviation of the absolute value of the β angle, which is the entirety of the surface of the oriented electromagnetic steel sheet.

6. The orientation-grade electromagnetic steel sheet according to any one of claims 1 to 4, It satisfies σ Dr <σ All , σ All It is the standard deviation of the absolute value of the β angle over the entire surface of the oriented electromagnetic steel sheet. σ Dr It is the standard deviation of the absolute value of the β angle at the domain control point.

7. The oriented electromagnetic steel sheet according to any one of claims 1 to 4, wherein, The magnetic domain control processing line is thermal strain.

8. The oriented electromagnetic steel sheet according to any one of claims 1 to 4, wherein, The magnetic domain control processing line is a slot.

9. The oriented electromagnetic steel sheet according to claim 7, characterized in that, The maximum value of the tensile strength introduced by the thermal strain in the magnetic domain control processing line is not uniform at each of the tensile strength measurement points.

10. The oriented electromagnetic steel sheet according to claim 9, characterized in that, It satisfies σ 2 (TS) m >5.0, TS m The tensile strength, measured in MPa and incorporating the thermal strain, at multiple magnetic domain control points. σ 2 (TS) m ) is TS m The variance.

11. The orientation-oriented electromagnetic steel sheet according to claim 9 or 10, characterized in that, It meets TS m（β<βDr） >TS m（β≥βDr） , TS m（β<βDr） At the magnetic domain processing point, angle β is less than β. Dr The arithmetic mean of the maximum tensile strength in MPa, measured at each of the magnetic domain treatment points and introduced into the thermal strain. TS m（β≥βDr） It is in the case that the β angle is β Dr The arithmetic mean of the maximum values ​​of the tensile strength measured at each of the above-mentioned magnetic domain treatment points and incorporating the thermal strain, expressed in MPa.

12. The oriented electromagnetic steel sheet according to claim 8, characterized in that, The maximum depth of the groove in the magnetic domain control processing line is not uniform at the measurement points of each groove.

13. The orientation-oriented electromagnetic steel sheet according to claim 12, characterized in that, It satisfies σ 2 (D) m >3.0, D m It is the maximum value of the groove depth in μm at the magnetic domain control point. σ 2 (D) m ) is D m The variance.

14. The orientation-oriented electromagnetic steel sheet according to claim 12 or 13, characterized in that, It satisfies D m（β<βDr） >D m（β≥βDr） , D m（β<βDr） At the magnetic domain control point, angle β is less than β. Dr The arithmetic mean of the maximum values ​​of the groove depth measured in μm at each of the magnetic domain control points. D m（β≥βDr） It is in the case that the β angle is β Dr The arithmetic mean of the maximum values ​​of the groove depth measured in μm at each of the above-mentioned magnetic domain control points.

15. A method for manufacturing an orientation-oriented electromagnetic steel sheet, comprising: The process of obtaining magnetic domain images of the original oriented electromagnetic steel sheet; Based on the distribution of domain widths in the domain image, the process steps for controlling the domain processing region are determined; and The process of applying magnetic domain control processing to the magnetic domain control processing region, which is determined by the distribution of magnetic domain width; In the orientation-oriented electromagnetic steel sheet that has undergone the aforementioned magnetic domain control treatment, let |β All |-|β Dr |≥0.1°, |β All | is the average absolute value of the β angle across the entire surface of the orientation electromagnetic steel sheet to which the magnetic domain control treatment has been applied. |β Dr | is the average of the absolute values ​​of the angle β at the intersection points (i.e., the magnetic domain control points) of multiple imaginary lines spaced 2 mm apart and parallel to the rolling direction of the oriented electromagnetic steel sheet that has undergone the magnetic domain control treatment, and the magnetic domain control treatment lines formed by the magnetic domain control treatment.

16. The method for manufacturing an orientation-oriented electromagnetic steel sheet according to claim 15, characterized in that, The region with a magnetic domain width greater than or equal to a specified value is designated as the magnetic domain control processing region.

17. The method for manufacturing an orientation-oriented electromagnetic steel sheet according to claim 15 or 16, characterized in that, The distribution of the magnetic domain width is derived from the magnetic domain image using a two-dimensional Fourier transform.

18. The method for manufacturing an orientation-oriented electromagnetic steel sheet according to claim 15 or 16, characterized in that, The magnetic domain control process is applied by irradiation with a laser or electron beam.

19. The method for manufacturing an orientation-oriented electromagnetic steel sheet according to claim 15, characterized in that, In the process of applying magnetic domain control processing to the magnetic domain control processing area, the magnetic domain control intensity is made uneven.

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