Improvement of the influence factors of spark on the portable magnetic particle flaw detector of Su Chi

The improvement measures of Kunshan Su Magnetic portable magnetic particle flaw detector on ignition factors are as follows:

1. For the raised high point generated in the process of wheelset pressing and unloading, the raised high point is eliminated as much as possible through manual grinding to reduce the occurrence of shaft end surface ignition. The machine operator self-checks the axle end face before the flaw detection, and once the raised high point is found, the grinding method is adopted to deal with it, so as to eliminate the phenomenon of the shaft end face and the clamping device of the flaw detection machine.

2, for the axle center hole edge and shaft end of the three-hole edge of the metal accumulation during the processing process can be adopted manual grinding method to eliminate the high point as far as possible; In addition, the small amount of iron filings adsorbed by the axle during the production and processing of the axle should be wiped by the inspection personnel, and the inspection can be carried out after the axle is wiped clean; As far as possible, reduce the convex high point of the axle center hole edge and the three holes at the shaft end, and improve the contact tightness between the shaft end and the magnetic particle inspection machine clamping device.

3. In order to make the electrode avoid the chamfer position of the axle end of the vehicle to be detected, the electrode size is improved. The diameter of the magnetizing electrode of the magnetic particle flaw detection machine is larger than the diameter of the axle journal. When the magnetizing electrode is in contact with the end face of the axle, the end face of the axle journal is all on the surface of the magnetizing electrode. In order to reduce the ignition phenomenon caused by the end face of the axle, it is considered to reduce the diameter of the magnetizing electrode of the flaw detection machine. When the magnetic particle flaw detection machine clamps the axle for magnetization, it can avoid contact with the end groove of the axle and avoid the ignition phenomenon caused by the end groove of the axle. In order not to change the original structure function of the axle magnetic particle flaw detection machine as much as possible, the change of the electrode diameter should not be too large, so as to avoid the position of the cylindrical groove of the axle end face.

Magnetic particle inspection machine After the application of ferromagnetic material is magnetized, because no continuity exists, the workpiece appearance and distortion near the outer flux treble part of the leakage magnetic field adsorption occurs when the magnetic workpiece appearance is configured on the appropriate illuminated magnetic marker that is visually visible and then displays the position, shape and size. The flaw detection machine shows the surface and internal defects of the machined parts and welded materials to assess the quality of the products. Shows the location, shape, and size of the discontinuities. It can detect extremely fine cracks, hairlines, white spots, folds, inclusions and other defects on the surface of the material, with high detection sensitivity, and can intuitively display the location, shape, size and severity of the defect, and the repeatability of inspection defects is good. It has been widely used in the inspection of pipes, bars, profiles, welding parts, machined parts and forgings, especially in the inspection of pressure vessels and bearings. When the workpiece is magnetized, if there is a defect on the surface of the workpiece, magnetic leakage is generated due to the increase of the magnetic resistance at the defect, forming a local magnetic field, and the magnetic powder shows the shape and position of the defect here, so as to determine the existence of the defect.

The solution of the demagnetization problem after the use of Su Magnetic portable magnetic particle flaw detector

The control circuit of the portable magnetic particle inspection machine uses the integrated circuit to output phase shift pulse, and then sends the phase shift pulse to the main circuit through power amplification. The magnetization and demagnetization current are adjusted by changing the phase of the thyristor conduction Angle. There are also the following three differences in the specific operation process that need attention:

1, when the need to demagnetize, wait for the demagnetization indicator light, press the support rod probe handle button or foot switch, the equipment output automatic attenuation AC current, the workpiece demagnetization.

2, when the AC magnetization current is used, the output cable can be separated to the public end and the AC end for magnetization and demagnetization operation.

3, when using DC magnetizing current, DC can not be demagnetized operation.

Magnetic particle inspection machine shows that the inspection results are not clear summary:

1. If the horizontal line on the test piece is not clearly displayed, the circumferential magnetization current can be appropriately raised, or the longitudinal magnetization current can be lowered until the display is clear. If the vertical line on the test piece is not clearly displayed, the longitudinal current can be raised, and the circumferential current can be lowered until the display is clear.

2, how to adjust the current display is not clear, if the use of water-based magnetic levitation we need to check whether there is oil on the surface of the test, oil and water are not compatible, the oil test will affect the adsorption performance of magnetic powder.

3, when the display is not clear how to adjust the need to confirm whether the current against the workpiece of the test bar, the test bar can be clearly displayed in close contact with the workpiece.

4, when the adjustment current is not clear, you can test the concentration of magnetic powder in the magnetic suspension. Long-term use of magnetic levitation needs to consider replacing a new magnetic levitation.

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5, when it is not clear how to adjust the current, ensure that the irradiance of the ultraviolet lamp meets the standard.

6, when the display is not clear how to adjust the current to confirm the magnetic circuit of the magnetic detection machine can be magnetized, there will be some local blind area there is a shape workpiece, change the direction of the magnetization need to be detected.

7, when it is not clear how to adjust the current display, please ensure that the accuracy of the test part is within the detectable range of the flaw detection machine, otherwise no matter how to adjust the equipment will not improve the detection accuracy of the equipment.

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