Method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force

A ferromagnetic material, non-destructive testing technology, applied in the direction of material magnetic variables, etc., can solve the problem of small size limit detection, achieve high detection speed, strong magnetic field strength, and reliable detection results

Active Publication Date: 2014-01-08
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES +1
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Problems solved by technology

However, since the excitation coil and detection coil are difficult to make very small, they are greatly limited in the detection of small-sized defects.

Method used

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  • Method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force
  • Method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force
  • Method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force

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Embodiment Construction

[0025] The non-destructive detection method for micro-defects in thin-plate ferromagnetic materials based on static magnetic force measurement proposed by the present invention comprises the following steps:

[0026] (1) Place the permanent magnet on the surface of the thin plate to be tested, and the magnetization direction of the permanent magnet is perpendicular to the surface of the thin plate;

[0027] (2) Calibrate with a calibration sheet of the same material as the sheet to be tested. The calibration method is: use a force sensor to measure the static magnetic force F acting on the permanent magnet 0 The reaction force F 0 ';

[0028] (3) Determination of internal defects of the thin plate to be tested, the determination process includes the following steps:

[0029] (3-1) Use a force sensor to measure the reaction force F on the permanent magnet 1 ';

[0030] (3-2) The above reaction force F 1 ' and F 0 ’ for comparison, if F 1 ' and F 0 ’ the same, it is dete...

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Abstract

The invention relates to a method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force and belongs to the technical field of nondestructive testing. The method comprises the following steps: arranging a permanent magnet on the surface of a calibration sheet, and measuring reacting force of magnetostatic force which acts on the permanent magnet by using a force sensor; arranging the permanent magnet on the surface of a sheet to be measured, and measuring reacting force stressed by the permanent magnet by using the force sensor; and comparing the two reacting forces, if the same, determining that a surface defect or an internal defect does not exist on the sheet to be measured, and if different, determining that a surface defect or an internal defect exists on the sheet to be measured. The method is simple in measurement process, relatively low in detection cost and reliable in detection result; the measurement accuracy is high, and micron order micro-defects in the magnetic sheets can be detected; the detection speed is high, and sheet materials can be rapidly detected on line in real time.

Description

technical field [0001] The invention relates to a non-destructive detection method for micro-defects in thin-plate ferromagnetic materials based on static magnetic force measurement, and belongs to the technical field of non-destructive detection. Background technique [0002] Non-destructive testing technology is an indispensable basic technology in product quality control and in the process of using many materials. Because it does not destroy the characteristics of product use, it can directly detect and evaluate its defect characteristics. Therefore, non-destructive testing has become an important technical means to ensure product integrity and reliability. [0003] Among them, thin-plate metal magnetically permeable materials are widely used, such as silicon steel sheet as the basic material of electronic components. The modern electronics industry requires smaller and smaller eddy currents, and the less induction heat generated during use, the better. Therefore, the th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/82
Inventor 王晓东任忠鸣
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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