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High-frequency impulse magnetic powder inspection method

A high-frequency pulse and magnetic particle flaw detection technology, applied in the direction of material magnetic variables, etc., can solve the problems of complex operation, high cost, low flaw detection efficiency, etc., and achieve the effect of low cost, convenient operation and high flaw detection efficiency.

Inactive Publication Date: 2018-06-05
JIANGYIN YONGXING MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-frequency pulse magnetic particle flaw detection method to solve the problems of complex operation, high cost and low flaw detection efficiency of the existing magnetic particle flaw detection technology proposed in the above-mentioned background technology

Method used

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  • High-frequency impulse magnetic powder inspection method

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Experimental program
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Effect test

Embodiment 1

[0023] The high-frequency pulse magnetic particle flaw detection method comprises the following steps:

[0024] S1: Pre-treatment: Clean the surface of the workpiece to be tested, remove the attachments on the surface of the workpiece, and clean and dry. The attachments include grease, paint, coating and impurities. After the attachments on the surface of the workpiece are cleaned, the surface of the workpiece needs to be cleaned. Grinding, so that the roughness of the workpiece surface is not greater than 3.2 microns;

[0025] S2: Magnetization: Place the workpiece in the energized coil to magnetize the surface of the workpiece. The energized coil needs to rotate at a constant speed, and the rotation speed is 30 rpm;

[0026] S3: Apply magnetic powder: apply magnetic powder evenly on the flaw detection surface in the effective flaw detection range, so that the magnetic powder is adsorbed on the defect, and then pass the instantaneous current through the workpiece. 3 times, a...

Embodiment 2

[0031] The high-frequency pulse magnetic particle flaw detection method comprises the following steps:

[0032] S1: Pre-treatment: Clean the surface of the workpiece to be tested, remove the attachments on the surface of the workpiece, and clean and dry. The attachments include grease, paint, coating and impurities. After the attachments on the surface of the workpiece are cleaned, the surface of the workpiece needs to be cleaned. Grinding, so that the roughness of the workpiece surface is not greater than 3.2 microns;

[0033] S2: Magnetization: Place the workpiece in the energized coil to magnetize the surface of the workpiece. The energized coil needs to rotate at a constant speed, and the rotation speed is 20 rpm;

[0034] S3: Apply magnetic powder: apply magnetic powder evenly on the flaw detection surface in the effective flaw detection range, so that the magnetic powder is adsorbed on the defect, and then pass the instantaneous current through the workpiece. 2 times, a...

Embodiment 3

[0039] The high-frequency pulse magnetic particle flaw detection method comprises the following steps:

[0040] S1: Pre-treatment: Clean the surface of the workpiece to be tested, remove the attachments on the surface of the workpiece, and clean and dry. The attachments include grease, paint, coating and impurities. After the attachments on the surface of the workpiece are cleaned, the surface of the workpiece needs to be cleaned. Grinding, so that the roughness of the workpiece surface is not greater than 3.2 microns;

[0041] S2: Magnetization: Place the workpiece in the energized coil to magnetize the surface of the workpiece. The energized coil needs to rotate at a constant speed, and the rotation speed is 25 rpm;

[0042] S3: Apply magnetic powder: apply magnetic powder evenly on the flaw detection surface in the effective flaw detection range, so that the magnetic powder is adsorbed on the defect, and then pass the instantaneous current through the workpiece. 3 times, a...

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Abstract

The invention discloses a high-frequency impulse magnetic powder inspection method and belongs to the technical field of magnetic powder inspection. The high-frequency impulse magnetic powder inspection method comprises the following steps: S1, pre-treatment: cleaning the surface of a workpiece to be inspected thoroughly to remove attachments on the surface of the workpiece, and cleaning and drying the workpiece; S2, magnetization: putting the workpiece in an electrified coil to magnetize the surface of the workpiece; S3, magnetic powder application: uniformly applying the magnetic powder to an inspection surface in an effective inspection range, wherein the magnetic powder is adsorbed to defective parts, then electrifying an instant current to the workpiece, and pouring a magnetic suspension for 2-3 times after power off; S4, inspection: inspecting the surface of the workpiece by using an electromagnetic probe which outputs high frequency impulse signals; S5, examination and recordingof magnetic traces; and S6, demagnetization: detecting the demagnetized workpiece with a magnetometer, and carrying out inspection with the high frequency impulse signals. The method is high in stability, low in cost and high in inspection efficiency, the detection precision is improved, and the method is convenient to operate and meets the production demands.

Description

technical field [0001] The invention relates to the technical field of magnetic particle flaw detection, in particular to a high-frequency pulse magnetic particle flaw detection method. Background technique [0002] Magnetic particle flaw detection uses the interaction between the leakage magnetic field at the defect of the workpiece and the magnetic powder. It uses the difference between the magnetic permeability of the surface of the steel product and the near-surface defects (such as cracks, slag inclusions, hairlines, etc.) and the magnetic permeability of the steel. After magnetization, these The magnetic field at the discontinuity of the material will be distorted, forming a part of the magnetic flux leakage, and the leakage magnetic field will be generated on the surface of the workpiece, thereby attracting the magnetic powder to form the magnetic powder accumulation at the defect - the magnetic trace, which shows the position and shape of the defect under appropriate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/84
CPCG01N27/84
Inventor 陈永兴陈斌陈丽
Owner JIANGYIN YONGXING MACHINERY MFG
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