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Magnetic property measurement method and magnetic property measurement device

A measuring method and technology of measuring device, applied in the field of magnetic property measuring device

Active Publication Date: 2014-02-05
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fluctuation of the detection signal has nothing to do with the characteristics of the steel strip

Method used

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  • Magnetic property measurement method and magnetic property measurement device
  • Magnetic property measurement method and magnetic property measurement device
  • Magnetic property measurement method and magnetic property measurement device

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Embodiment Construction

[0028] Hereinafter, a magnetic property measurement method and a magnetic property measurement device according to embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, the same part is attached|subjected and shown by the same code|symbol in drawing.

[0029] figure 1 It is a schematic diagram showing the configuration of a magnetic property measurement device according to an embodiment of the present invention. Such as figure 1 As shown, the magnetic property measurement device 1 includes a detection head 2a and a control unit 2b. The detection head 2 a includes an excitation element 3 , a magnetic sensor 4 , and a distance measuring device 5 , and the control unit 2 b includes an excitation device 6 , a computing device 7 , a storage device 8 , and a display device 9 .

[0030] The excitation element 3 is a device for magnetizing the subject 10 and can be composed...

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Abstract

For the purpose of measuring a local magnetic property distribution in a steel plate stably even when a variation in an amount of liftoff occurs, a magnetic property measurement method comprises: a step of acquiring beforehand, as normal part liftoff data, a relationship (Ls(l)) between an output of a magneto-sensitive element at a normal part of a subject to be measured beforehand and an amount of liftoff of the magneto-sensitive element; a step of acquiring beforehand, as defective part liftoff data, a relationship (Lp(l)) between an output of the magneto-sensitive element at a defective part of the subject to be measured beforehand and an amount of liftoff of the magneto-sensitive element; a measurement step of measuring an output (x) of the magneto-sensitive element at a subject and an amount of liftoff (l) of the magneto-sensitive element when the output (x) is obtained; and a correction step of performing an operation for correcting the output (x) of the magneto-sensitive element at the subject measured in the measurement step, by using the normal part liftoff data, the defective part liftoff data, and the amount of liftoff measured in the measurement step.

Description

technical field [0001] The present invention relates to a magnetic property measuring method and a magnetic property measuring device for measuring a local magnetic property distribution of a steel sheet. Background technique [0002] In the manufacturing process of the steel sheet, in order to evaluate and manage the characteristics of the steel sheet, the local magnetic property distribution of the steel sheet is often measured electromagnetically. The distribution of local magnetic properties mentioned here is not only the distribution of magnetic properties such as coercive force, magnetic permeability, and iron loss, but also electromagnetic changes for detection caused by damage or inclusions on the surface or inside of the steel plate. Therefore, the measuring device using electromagnetic magnetic properties can also be applied to eddy current testing, leakage magnetic flux testing, and the like. [0003] As a problem common to magnetic property measuring devices usi...

Claims

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Application Information

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IPC IPC(8): G01N27/72G01N27/82
CPCG01N27/82G01N27/9053G01N27/72
Inventor 西泽佑司原园学冈田典久四辻淳一
Owner JFE STEEL CORP
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