Small metal magnetic memory crack detection method

Abstract

The invention relates to the technical field of metal magnetic memory detection, and provides a small metal magnetic memory crack detection method which comprises the following steps: S1, zeroing treatment: eliminating the influence of an earth magnetic field or an environment magnetic field; s2, scanning a workpiece to be detected by using a sensor head, amplifying a signal of a sensor through an amplifying circuit, and then collecting the signal by a single chip microcomputer in real time; s3, scanning the workpiece to be detected by using a sensor head, amplifying and differentiating a signal of a sensor through an amplifying circuit, and then collecting the signal in real time by a single chip microcomputer; s4, processing and calculating the signals collected after amplification and filtering; and S5, processing and calculating the signals acquired after the differential amplification. The intensity of a leakage magnetic field on the surface of a shafting or iron workpiece can be measured in real time, and the intensity of a weak magnetic field can be measured; dynamic detection is performed on the magnetic field and the gradient, a magnetic field intensity change curve and a generalized gradient curve are measured, the fracture and stress concentration positions of the shaft system are accurately searched, and a buzzer is configured to perform sound alarm.

Description

technical field [0001] The invention relates to the technical field of metal defect magnetic memory detection, in particular to a detection method for small metal magnetic memory cracks. Background technique [0002] Metal magnetic memory testing is a non-destructive testing method that can perform early diagnosis and has emerged in the past 30 years. Under the action of working load, the iron components in the geomagnetic environment will have magnetostrictive magnetic domain structure orientation and irreversible reorientation inside, and form the largest leakage magnetic field Hp change in the stress and deformation concentration area. The detection of metal magnetic memory detects the defect position of the metal through the relationship between the displacement of the stress and deformation concentration area and the leakage magnetic field Hp. In recent years, with the promotion and application of metal magnetic memory methods and detection devices in Russia, other sci...

AI Technical Summary

Problems solved by technology

[0003] In the current metal magnetic memory detection methods, most magnetic memory detectors measure the digital sum or curve of the magnetic field strength of the measured environment, and judge the metal defect through the zero-crossing position of the magnetic field strength curve. At this time, the influence of the background magnetic field cannot Elimination, large deviation of test results

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