Making method of standard samples for verifying heat injury Barkhausen detection sensitivity

Abstract

The invention belongs to a nondestructive detection technology, and relates to a making method of burn standard samples for verifying the Barkhausen detection sensitivity. In the invention, a laser instant heating process is adopted to make heat injury defects having different degrees, the burn degree is controllable, and the operation is simple; and made heat injury defects are made in a grading manner and have three grades of heat injuries comprising slight over-tempered burn, severe over-tempered burn and quenching burn, so it is very representative for grinding burn defects. In the invention, samples having different burn grades of the heat injury defects are successfully obtained, the dimensions, shapes and positions of the heat injury defects of the samples can be determined according to test requirements, and the making process is easy to control, so the samples are especially suitable for verifying the apparatus sensitivity in the Barkhausen detection and verifying the detection sensitivity, and can also be applied to make a Barkhausen detection acceptance standard in order to provide a basis for the evaluation of the heat injury defects.

Description

technical field [0001] The invention belongs to the non-destructive detection technology, and relates to a method for making a burn sample used in a Barkhausen detection sensitivity test. Background technique [0002] When grinding ferromagnetic parts, improper grinding process can easily cause surface burn defects. Burn defects will cause premature failure of parts or reduce fatigue life. Therefore, it is necessary to detect burn defects. The traditional method generally adopts the acid etching detection method, but this method is a destructive detection method, and it will cause environmental pollution and the detection results are easily missed due to the subjective judgment of the detection personnel. At present, the emergence of a new non-destructive testing method, that is, the Barkhausen noise detection method, has solved the problem of non-destructive testing of grinding burns. When grinding burns, this method is currently the only method that can detect substrate b...

AI Technical Summary

Problems solved by technology

[0003] As a new technology, the Barkhausen detection method has not been fully applied, mainly because there are no relevant standard specifications and calibration test blocks, especially when the factories carry out the Barkhausen grinding burn detection. There is no relevant sensitivity calibration test. block, unable to verify device

It is also difficult to make burns by grinding, and it is uncontrollable. Generally, it is difficult to make burn defects, and the degree of burns cannot be controlled.

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