A yoke-type local micro-magnetization detection device suitable for linear defects

Abstract

The invention discloses a yoke-type local micro-magnetization detection device suitable for linear defects. The device includes a magnetic sensitive element part, a magnetic induction part and a yoke-type local micro-magnetization part. The magnetic sensitive element part includes a magnetic sensitive element and a lead wire end, magnetic guide core and guide core sleeve, the magnetic guide core is composed of cuboid guide cores of different lengths; the magnetic induction part is composed of a magnetic induction coil and a lead end wound on the outside of the guide core sleeve; supported by the guide core sleeve The fixed yoke-type local micro-magnetization part includes a square magnetic-conducting member, a yoke-type double magnet and an oblique double-conducting magnetic member. This part introduces the magnetic field into the metal body to be detected to achieve the effect of local micro-magnetization. The magnetic sensitive element connected to the guide core and the magnetic induction coil outside the guide core sleeve transmit the leakage field signal of the linear defect on the surface of the metal part to realize the detection of the surface / interface shape of the high-precision metal part.

Description

technical field [0001] The invention belongs to the technical field of non-destructive detection of surface / interface linear defects of high-precision metal parts, and more specifically relates to a yoke-type local micro-magnetization detection device suitable for linear defects. Background technique [0002] During the processing of high-precision metal parts, due to tool wear, various forces, heat, etc., the surface of the workpiece is prone to form "line" defects such as scratches and cracks, and the "line" type defects produced in general high-precision metal parts processing The size of the defect is extremely small, which brings difficulties to the online monitoring during the processing of high-precision metal parts. Although the existing "line" defect detection methods such as optics and acoustics have achieved certain results, they all have certain requirements for the detection environment, such as requiring the surface of metal parts to have a certain degree of sm...

AI Technical Summary

Problems solved by technology

[0002] During the processing of high-precision metal parts, due to tool wear, various forces, heat, etc., the surface of the workpiece is prone to form "line" defects such as scratches and cracks, and the "line" type defects produced in general high-precision metal parts processing The size of the defect is extremely small, which brings difficulties to the online monitoring during the processing of high-precision metal parts

Although the existing "line" defect detection methods such as optics and acoustics have achieved certain results, they all have certain requirements for the detection environment, such as requiring the surface of metal parts to have a certain degree of smoothness, cleanliness, or can only be detected offline , these all make the processing efficiency of high-precision metal parts low, and cannot well meet the needs of online processing of high-precision metal parts

In addition, the residual magnetism generated on the metal surface during the processing of metal parts is extremely weak, causing the magnetic flux leakage signal of non-destructive testing to be very weak and even difficult to detect, resulting in low detection sensitivity and resolution. The signal size is different, and the existing detection methods are difficult to achieve the purpose of simultaneous detection

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