The improvement of portable magnetic particle flaw detector equipment in igniting technology

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.

Is the damage to the eyes in the magnetic particle inspection

The magnetic rail method is one of the most widely used methods in the detection of fluorescent magnetic particle. In the magnetic rail method, the main test index of the equipment is the lifting force. Among most indexes and standards, the magnetic rail lifting force is used as the standard for equipment performance control and equipment calibration. Rail lifting force is the ability of a magnet to lift a ferritic rigid block with a weight of G only by virtue of its magnetic attraction. It is generally believed that the magnetic field strength of the magnetic rail can be measured by the lifting force of the magnetic rail.

The main detection principle of the magnetic flux leakage detection method is that the workpiece is magnetized (close to saturation), so that it has a certain magnetic flux density, so that the leakage magnetic field is generated at the discontinuity, and the magnetic field sensor sends the output signal to the operating amplifier. Due to the magnetic saturation state, the workpiece has a fairly high magnetic field strength and magnetic field density, and the magnetic field line is not limited, so the workpiece surface has a large magnetic leakage, which is conducive to field detection.

The lamp used by the fluorescent magnetic powder is called a black light lamp, which is actually an ultraviolet lamp, and there is the influence of ultraviolet radiation. Inspectors use ultraviolet lamps to produce ultraviolet light sources, and long-term gaze will cause certain damage to the human eye. Wearing protective glasses can appropriately reduce the burn of the ultraviolet lamp source on the eyes.

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