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A method and system for measuring the surface hardness of a ferromagnetic conductor based on the skin effect

A technology of surface hardness and skin effect, applied in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve problems such as low efficiency, and achieve the effect of simple and reliable testing

Active Publication Date: 2020-04-07
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Conventional analysis methods also have a common limitation, that is, they all need to be detected point by point and area by area, and the efficiency is low

Method used

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  • A method and system for measuring the surface hardness of a ferromagnetic conductor based on the skin effect
  • A method and system for measuring the surface hardness of a ferromagnetic conductor based on the skin effect
  • A method and system for measuring the surface hardness of a ferromagnetic conductor based on the skin effect

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Embodiment 1

[0020] Embodiment 1. A method for measuring the surface hardness of ferromagnetic conductor materials based on the skin effect. The following will combine figure 1 A method for measuring the surface hardness of ferromagnetic conductor materials based on the skin effect of this embodiment is described in detail.

[0021] Such as figure 1 As shown, a method for measuring the surface hardness of ferromagnetic conductor materials based on the skin effect includes the following steps:

[0022] Step 1: Select multiple surface hardness H S (i) For standard samples that are different from each other and have the same material and geometric parameters, select two target detection points on each standard sample;

[0023] Step 2: Add high-frequency constant current signals with the same amplitude and frequency to both ends of the standard sample to detect different known surface hardness H S (i) The high-frequency voltage value V between the two target detection points on the standard sample ...

Embodiment 2

[0035] Embodiment 2. A method for measuring the surface hardness of a ferromagnetic conductor material based on the skin effect. The method for measuring the surface hardness of a ferromagnetic conductor material based on the skin effect of the present invention will be described in detail below.

[0036] A method for measuring the surface hardness of ferromagnetic conductor materials based on the skin effect. The difference from the first embodiment is that in this embodiment, preferably, step 21a is included between step 2 and step 3:

[0037] Step 21a: Add low-frequency constant current signals with the same frequency to both ends of each standard sample, and detect that the part between the two target detection points has different known surface hardness H S (i) Low frequency voltage value V SL (i);

[0038] Step 3: According to different known surface hardness H S (i) Low frequency voltage value V SL (i) and high frequency voltage value V SH (i) Calculate the relative voltage v...

Embodiment 3

[0046] Embodiment 3. A method for measuring the surface hardness of a ferromagnetic conductor material based on the skin effect. The method for measuring the surface hardness of a ferromagnetic conductor material based on the skin effect of the present invention will be described in detail below.

[0047] A method for measuring the surface hardness of ferromagnetic conductor materials based on the skin effect. The difference from the first embodiment is that in this embodiment, the step 21b is included between the step 2 and the step 3:

[0048] Step 21b: Add low-frequency constant current signals to both ends of the standard sample, and detect that the part between the two target detection points has a known surface hardness H Smid Low frequency voltage value V SLmid ;

[0049] Among them, the surface hardness H Smid Is the middle value of the known surface hardness range;

[0050] Step 3: According to the low frequency voltage value V SLmid And different known hardness H S (i) Co...

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PUM

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Abstract

The present invention relates to a ferromagnetic conductor surface hardness measurement method and a ferromagnetic conductor surface hardness measurement system based on skin effect. The ferromagnetic conductor surface hardness measurement system comprises an alternating current constant current signal module, an alternating current voltage detection module and a main control module, wherein the alternating current constant current signal module provides a high frequency or low frequency alternating current constant current signal for a standard sample or a sample to be measured, the alternating current voltage detection module detects the high frequency voltage value VSH(i) between two target detection points on different standard samples having known surface hardness HS(i) and detects the high frequency voltage value VSH' between two target detection points on the sample to be measured, and the main control module draws the change curve HS(i)-VSH(i) of the surface hardness HS(i) of the standard along with the high frequency voltage value VSH(i), and reads the sample surface hardness HS'(i) corresponding to the high frequency voltage value VSH' from the change curve HS(i)-VSH(i). According to the present invention, the influence caused by the surface is low, the samples with characteristics of complex surface, pollution on the surface, and the like can be detected, no lift-off effect is generated, no quantitative requirement is generated on the geometric parameters of the sample, the testing is simple and reliable, and the method and the system can further be used for evaluating the depth of the surface hardness reinforcement layer of the sample to be measured.

Description

Technical field [0001] The invention relates to the technical field of electromagnetic non-destructive testing, in particular to a method and system for measuring the surface hardness of a ferromagnetic conductor based on the skin effect. Background technique [0002] The surface hardness of steel parts such as engineering structural steel, rail treads, ship steel plates, bearings, bolts, knives, weapons, etc. is related to product quality, service life, cost and even life and property safety. Hardness measurement can also be used to evaluate or improve processes such as heat treatment, material formulation, precision machining, etc., assess safety risks, prevent accidents, and assist in precision machinery adjustment. Therefore, it is of great significance to accurately and reliably measure the surface hardness of ferromagnetic conductor components such as steel. [0003] Conventional hardness testing methods are divided into destructive analysis and non-destructive analysis. Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00
CPCG01N27/00
Inventor 杨勇杨文璐杨远聪王华俊安虹宇
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)