Ferromagnetic material crack warning detection method and apparatus

Abstract

The invention discloses a crack detection warning method and a crack detection warning apparatus for monitoring the quality of a ferromagnetic material. The apparatus comprises a microprocessor 1, an excitation module 2, a pen-type probe 3, a signal processor 4 and a data acquisition device 5, wherein the pen-type probe comprises a probe shell 6, the ferromagnetic material 7, a probe bracket 8, rollers 9, a probe lead 10, a ferrite magnetic core 11, an excitation coil 12, a secondary coil 13 and roller brackets 14. The method is characterized by comprising the following steps of: monitoring the material quality anomaly of the ferromagnetic material by detecting the fluctuation of an initial magnetic conductivity parameter, and judging a crack or the probability of a potential crack trend according to the material quality anomaly; and if the shapes of the one-dimensional or two-dimensional data of detection results are different, a great amount of data scattered beyond the interval of ['mean value-standard difference', 'mean value+standard difference'] appears at a certain position, and a correlation coefficient between the current data and historical data of an area is less than a certain characteristic value beta (beta is more than or equal to 0 and less than or equal to 1), determining the material quality anomaly exists in the area where the position is, and suspecting the crack or the existence of the potential crack trend according to the material quality anomaly.

Description

technical field [0001] The invention relates to a crack early warning detection and evaluation method for ferromagnetic metal materials, especially by measuring the initial permeability parameters of ferromagnetic materials, it can realize the scanning detection of material grain size and defect distribution state, so as to detect potential Instruments for crack assessment and early warning. Background technique [0002] The cracks of ferromagnetic metal parts mainly originate from three links, namely raw material cracks, cracks formed by internal stress in processing and manufacturing, and cracks formed by fatigue and overload during use. Most of the cracks in the first two situations can be detected and eliminated early in the manufacturing process through complete detection methods, and usually do not bring safety hazards to product use and equipment operation. The third type of cracks is due to the different crack occurrence time. The determinism and unknowability of th...

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Problems solved by technology

[0006] Technical problem: the purpose of the present invention is to provide a solution to the problem that existing ferromagnetic metal material crack instruments can only detect macroscopic crack defects that have been formed, but cannot effectively detect potential tissue defects that have not yet formed cracks but have a tendency to crack. A method and instrument for early warning detection of cracks in ferromagnetic metal materials based on initial magnetic permeability method

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