Application of fluorescent magnetic particle flaw detection equipment in industrial production and processing

Fluorescent magnetic particle flaw detection equipment all over a variety of special fluorescent magnetic particle flaw detector, in addition to three-dimensional magnetization flaw detector and pulse magnetization flaw detector, other special models, such as connecting rod, tooth ring, brake bracket, crankshaft, camshaft, half shaft, ball pin, bearing ring, bearing roller, brake disc, universal joint, cross shaft and other special models, Fluorescent magnetic particle flaw detection machine and other special two-station and three-station detection models can be said to be extended and developed from the universal fluorescent magnetic particle flaw detection machine Fluorescent magnetic particle flaw detection machine is a mobile magnetic flaw detection machine that can be used for AC magnetism and automatic demagnetization of damaged parts. Can be used as external force detection and residual magnetic detection magnetic fluorescence magnetic powder flaw detection machine can be used in workshops or laboratories, and transported to the site for flaw detection. The fluorescence magnetic particle flaw detector can make the relevant part of the part get the appropriate magnetization. Most of the local magnetization instruments use logic circuit, power off phase controller, residual magnetic stability, to ensure the quality of the fluorescent magnetic particle flaw detector. Automatic demagnetization can disappear from the magnetizing current to zero, so that the remanence disappears, simple operation, better effect.

General steps of crack detection machine analysis:

1 Understand the situation

First of all, understand the shape and distribution of magnetic powder diagram, parts processing process, parts material and working state.

2 Perform Analysis

The defects found are divided into two categories: (1) cracks mainly refer to quenching, forging, casting, welding cracks, some important parts and grinding cracks and other defects, which are not allowed defects; (2) Hair lines and non-metallic inclusions are permitted defects, but their degrees of tolerance are different, and must be analyzed according to the specific circumstances. When it is found that the defects are not allowed, it is necessary to report to the competent authorities immediately and make a decision on scrapping together with the relevant units.

3 Recheck or do a supplementary test

If there is any doubt about the above work, recheck or supplementary test can be carried out.

Solving the problem of peak output of portable magnetic particle flaw detection machine

Portable magnetic particle flaw detection machine is the most common equipment to detect whether the workpiece has defects, and its measurement accuracy requirements are quite high. When the flaw detection machine is used for workpiece defect detection, the current needs to be set according to the maximum cross section of the flaw detection workpiece. So how should we set the magnetization current of the magnetic particle flaw detection machine is the most appropriate? Today, Su magnetic flaw detection machine manufacturers to discuss with friends:

1. How to set the maximum output value of magnetization current of the flaw detection machine?

In order to maximize the inspection accuracy of the flaw detection machine, the magnetizing main transformer, the core component that provides magnetizing current, must be able to provide low voltage and high current output. In addition, according to the magnetic properties of the materials used in the workpiece, the size, shape, surface condition, defects and other factors, determine the inspection method, magnetic field direction and magnetic field strength of the magnetic particle flaw detection machine, and the effective detection range. Therefore, when selecting the magnetization current value, it is necessary to follow the magnetization specification, so that the magnetic field strength is controlled within a reasonable range, that is, the calibration magnetization current needs to reach the maximum output value.

2. What determines the maximum output value of magnetization current?

The maximum output value of magnetization current is the key to the magnetization of the workpiece, which in addition to being determined by the value of the ammeter, is also affected by factors such as the transformer or shunt, sampling resistance shunt to the ammeter value, so the calibration magnetization current needs to be verified together with the calibration ammeter to detect the relative error of the magnetization current within the specified range.

Improvement measures for ignition factors of magnetic particle flaw detection machine:

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 inspection personnel of the magnetic particle inspection machine self-inspect the axle end face before the inspection. Once the raised high point is found, the grinding method is adopted to deal with it, so as to eliminate the phenomenon that the axle end face is not closely adhered to the clamping device of the inspection machine as far as possible.

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.

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