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Weak magnetic programming method for slight ferromagnetic component

A ferromagnetic and component technology, which is applied in the field of weak magnetic planning of slender ferromagnetic components, can solve the problems of complex and bulky equipment, strong magnetic pollution of the measured components, etc.

Active Publication Date: 2011-10-05
LUO YANG WIRE ROPE INSPECTION TECH CO LTD
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  • Application Information

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Problems solved by technology

[0005] In addition, complex and bulky equipment, strong magnetic pollution to the components under test, high energy consumption, and demagnetization required for repeated testing are all negative effects of strong magnetic magnetization methods on magnetic testing.
Due to these problems, it is difficult to implement the strong magnetic detection method in general working conditions.

Method used

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  • Weak magnetic programming method for slight ferromagnetic component
  • Weak magnetic programming method for slight ferromagnetic component
  • Weak magnetic programming method for slight ferromagnetic component

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Embodiment Construction

[0062]The magnetic field weakening device described in the present invention adopts N35 brand Nd-Fe-B rod magnets as the magnetic source, and arranges them in a ring along the plastic skeleton with an outer diameter of φ46mm, forming a φ40mm (diameter) × 75mm (axial length) of the magnetic field space, the axial magnetic field strength at the center of the device is 1035A / m (the measured value is 1.3mT without the intervention of a magnetizer). If it conforms to the circular section below φ36mm or other cross-sectional shapes with the same area, and the material is medium-high carbon content steel, iron and other ferromagnetic slender ferromagnetic components (larger cross-section may cause the gap between the device and the component to be too small, It is not conducive to mutual movement), radially inserted from the special opening on the device, and the opening is closed, and a section of the component is surrounded by the magnetic field space.

[0063] The weak magnetic pl...

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Abstract

The invention relates to a weak magnetic programming method for a slight ferromagnetic component, which is achieved by three technical flows of quantitative magnetic loading, self-adapting load releasing and stable state magnetic energy product by a weak magnetic programming device, and has the advantages of high detection efficiency, scientific and reliable data and comparatively low technical cost. Because of the guarantee of the technical proposal, objective reflections can be obtained through the magnetic state difference of unit volume elements which are continuously and evenly distributed on the slight ferromagnetic component along the center shaft direction, the qualitative and quantitative relation between the magnetic state difference and defects is not affected by the original structure of the component and the depth of defect positions, and a weak magnetic detection method is provided with the excellent detection performances of achievement of no fundamental-noise detection, high signal sensitivity and good stability. The weak magnetic programming method requires no conventional magnetizers to finish weak magnetic detections, and has the advantages of small overall volume of equipment, light weight, and convenient carrying, mounting, use and maintenance.

Description

technical field [0001] The invention relates to the field of magnetic field weakening planning suitable for elongated ferromagnetic components and magnetic non-destructive flaw detection, in particular to a method for weakening magnetic field planning of elongated ferromagnetic components. Background technique [0002] At present, the focus of traditional magnetization methods is to pursue the strong magnetic characteristics of the magnetizer. Taking the magnetic induction intensity as the scale, the greater the field strength H of the external magnetic field, especially when the ferromagnetic material is in a saturated or near-saturated state, the magnetic induction intensity B is even higher. Closer to Bs, the technical characteristics required for subsequent technical measures are more obvious, so the "magnetization" in the usual sense is mainly high-intensity magnetization, or the so-called saturation magnetization means. According to the formation of the magnetic field ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F13/00G01N27/82
CPCG01N27/82
Inventor 窦毓棠杨旭窦伯英窦柏林
Owner LUO YANG WIRE ROPE INSPECTION TECH CO LTD
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