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Eddy current inspection of case hardening depth

A hardening depth, eddy current technology, applied in the field of detection systems, can solve problems such as unsuitable surface hardening depth, not local information, etc.

Active Publication Date: 2012-07-04
GENERAL ELECTRIC CO
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, since eddy current probes are mounted around the part, they can only provide information about the average case hardening depth of such parts rather than localized information
In addition, these types of eddy current probes are generally used to inspect the depth of case hardening of cylindrical parts and may not be suitable for inspecting the depth of case hardening of parts with other shapes

Method used

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  • Eddy current inspection of case hardening depth
  • Eddy current inspection of case hardening depth
  • Eddy current inspection of case hardening depth

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Embodiment Construction

[0016] Embodiments of the present disclosure are described herein with reference to the accompanying drawings. In the ensuing description, well-known functions or constructions are not described in detail in order to obscure the understanding of the present disclosure with unnecessary detail.

[0017] figure 1 is a schematic diagram of an eddy current inspection system 10 for inspecting a part 100 in accordance with one embodiment of the present invention. As used herein, the term "part" may refer to any object suitable for inspection, including but not limited to products, components, structures, test specimens, and the like. In some applications, the part 100 may be subjected to one or more hardening processes, such as a heat treatment process and a carburizing process, such that one or more hardened layers may form on the surface layer(s) of the part 100, thereby improving its abrasion resistance. For some arrangements, part 100 includes a cylindrical shape. In other ex...

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Abstract

A multi-frequency eddy current (MFEC) inspection system is provided for inspection of case hardening depth on a part. The MFEC inspection system comprises a generator configured to generate one or more multi-frequency excitation signals and an eddy current probe configured to be disposed at one side of the part. The eddy current probe comprises one or more drivers and one or more pickup sensors. The one or more drivers are configured to receive the one or more multi- frequency excitation signals to induce eddy currents in the part. The one or more pickup sensors are configured to detect the induced eddy currents within a local area of the part to generate one or more multi-frequency response signals. The MFEC system further comprises a processor configured to receive the one or more multi- frequency response signals for processing to determine a case hardening depth of the local area of the part. A pulse eddy current inspection system and an eddy current inspection method are also presented.

Description

technical field [0001] Generally, the present invention relates to detection systems and methods. More specifically, the present invention relates to eddy current inspection systems and methods for inspecting the depth of case hardening of parts. Background technique [0002] Parts such as crankshafts, valves, gears, piston cylinders are often heat treated and carburized to produce a case hardened layer on their surface to improve wear resistance. Different parts generally have different requirements for the depth of hardfacing of the hardfacing layer thereon. Therefore, inspections need to be performed to determine whether the depth of case hardening on such parts is suitable for quality control. [0003] Seek Non-Destructive Evaluation (NDE) techniques to verify the depth of case hardening of a part. Since the electrical conductivity and magnetic permeability in hardfacing areas are different from those in other areas, eddy current testing techniques can be used to veri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/06
CPCG01N27/904
Inventor H·孙Y·A·普罗特尼科夫C·王S·C·纳思A·C·谢拉-瓦德
Owner GENERAL ELECTRIC CO
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