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Electron gun abnormality detector and electron gun abnormality detection method

An anomaly detection, electron gun technology, applied to electrode devices and related components, the size/direction of the magnetic field, and the use of magneto-optical equipment for magnetic field measurement, etc.

Active Publication Date: 2015-05-06
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, even when a defect occurs in the magnetic domain refinement process, it takes a long time to detect the defect, and the continued production of defective products leads to a decrease in yield.

Method used

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  • Electron gun abnormality detector and electron gun abnormality detection method
  • Electron gun abnormality detector and electron gun abnormality detection method
  • Electron gun abnormality detector and electron gun abnormality detection method

Examples

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Embodiment

[0062] Next, an operation example of a production line in which abnormality detection processing of the electron gun 3 of the magnetic domain refining device 2 is performed by the electron gun abnormality detection method according to the embodiment of the present invention will be described. Figure 10 as well as Figure 11 It is a graph of the minimum value of the width of the magnetic domain discontinuity detected by the electron gun abnormality detection method according to the embodiment of the present invention.

[0063] Figure 10 Indicates the inspection results of a production line for two days, Figure 11 is from Figure 10 The two-day inspection results of the production line 3 months after the inspection started. The inspection is performed at the time of stop when replacing the coil of the steel sheet S in the production line. in addition, Figure 10 as well as Figure 11 Example combination of diagrams figure 2 Assignment of reference symbols in the inspe...

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Abstract

This electron gun abnormality detection device (1) detects abnormalities in an electron gun (3) of a magnetic domain segmentation device (2) for a magnetic steel sheet, said device being provided with a plurality of electron guns (3a, 3b, 3c, 3d). The electron gun abnormality detection device (1) is provided with: a magneto-optic element (5) that comes into contact with and separates from inspection areas (R1, R2, R3), which are established in such a manner as to include the boundaries of magnetic domain discontinuity sections (L) that occur as a result of the surface of the magnetic steel sheet being exposed to electron beams from the plurality of electron guns (3a, 3b, 3c, 3d), and is capable of detecting, as optical characteristics, magnetic domain structures of the steel sheet (S) in the inspection areas (R1, R2, R3); a light source (7) that projects linearly polarized light on the magneto-optical element; and a detector (12) that detects polarized light that has been rotated by the magnetic domain structures of the steel sheet (S), which has been transferred to the magneto-optical element (5).

Description

technical field [0001] The invention relates to an electron gun (electron gun) anomaly detection device and an electron gun anomaly detection method. Background technique [0002] Electrical steel sheet (electrical steel sheet) is a steel sheet with high magnetic permeability, low iron loss and excellent magnetic properties. For example, a grain oriented electrical steel sheet is often used for a magnetic core of a transformer. The alternating current flowing through the electric wire wound around the magnetic core of the transformer generates an alternating magnetic field inside the magnetic core. Generally, when an AC magnetic field is applied in a steel sheet, eddy current loss (eddy current loss) and hysteresis loss (hysteresis loss) occur. These eddy current losses and hysteresis losses are required to be reduced in electrical steel sheets. [0003] It is inevitable to generate eddy current loss when an AC magnetic field is applied to the steel plate, and the higher ...

Claims

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Application Information

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IPC IPC(8): G01N27/72G01R33/032
CPCG01R33/032G01N27/72G01N21/21G01N2201/062H01J29/48
Inventor 伊藤友彦四辻淳一高城重宏山口广花泽和浩古贺泰成
Owner JFE STEEL CORP
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