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

Abstract

The invention discloses a yoke-type local micro-magnetization detection device suitable for point 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 lower end of the magnetic guide core adopts a conical structure to refine the detection area to achieve high-resolution detection of point defects; the magnetic induction part is composed of a magnetic induction coil wound outside the guide core sleeve ; The yoke-type local micro-magnetization part supported and fixed by the guide core sleeve includes a ring-shaped magnetic-conductive member, a magnet connector, a yoke-type double magnet and an oblique double magnetic-conductive member. This part guides the magnetic field into the metal body to be detected , to achieve the effect of local micro-magnetization, through the magnetic sensitive element connected with the magnetic guide core or the magnetic induction coil outside the guide core sleeve, the signal of the leakage field quantity signal of the point defect on the surface of the metal part is transmitted, and the surface / interface shape of the high-precision metal part is realized. sexual detection.

Description

technical field [0001] The invention belongs to the technical field of non-destructive detection of point defects on the surface / interface of metal parts, and more specifically relates to a yoke-type local micro-magnetization detection device suitable for point defects. Background technique [0002] Due to the complex physical phenomena induced by force-thermal coupling and other loads during the processing of high-precision metal parts, the surface / interface shape of the part is greatly affected. Therefore, it is necessary to detect the surface condition of the part itself. The methods for detecting surface topography include contact methods such as stylus method and impression method, and optical non-contact methods. However, the above detection methods have certain limitations. The contact method is easy to damage the surface of soft parts and is ineffective for surface oblique and deep wrinkles, while the optical non-contact method is affected by the ambient brightness a...

AI Technical Summary

Problems solved by technology

However, the above detection methods have certain limitations. The contact method is easy to damage the surface of soft parts and is ineffective for surface oblique and deep wrinkles. However, the optical non-contact method is affected by the ambient brightness and has low detection accuracy.

[0003] In short, the existing detection methods require the object to be inspected to have a specific surface cleanliness and static state, which cannot meet the harsh environmental detection requirements during part processing. The residual magnetism is relatively weak, and the existing magnetic induction devices cannot detect weak magnetic field signals such as tiny "point" type pits and scratches. Therefore, in order to break through the tiny "point" type It is of great significance to invent a high-resolution point-type magnetic induction device to detect defects and meet the requirements of online monitoring of working conditions and environments.

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