Planar carburizing sample determination method based on magnetic method

A sample measurement and carburizing technology, applied in the direction of material magnetic variables, etc., can solve the problems that non-destructive testing cannot be achieved, and the carburized layer cannot guarantee the detection efficiency and accuracy at the same time, so as to achieve fast, accurate and repeatable measurement results Good performance and optimized database effect

Pending Publication Date: 2021-05-04
AVIC HARBIN BEARING
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing method for detecting carburized layer cannot guarantee the detection efficiency and accuracy at the same time, and cannot achieve non-destructive inspection

Method used

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  • Planar carburizing sample determination method based on magnetic method
  • Planar carburizing sample determination method based on magnetic method
  • Planar carburizing sample determination method based on magnetic method

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Experimental program
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specific Embodiment approach 1

[0020] Specific implementation mode one: combine figure 1 To illustrate the present embodiment, the planar carburized sample magnetic method measuring method of the present embodiment includes:

[0021] Step 1. Select 10 sample blocks of each of the 6 carburized layer depths, and grind each sample block according to 0.06mm, 0.04mm, 0.06mm, 0.04mm (not limited to 4, but can be multiple times) The rule of depth is to grind the carburized layer depth in stages, and each grinding can obtain a carburized layer depth data, which constitutes a carburized layer depth data set;

[0022] Step 2. Using the 3MA penetration depth tester, the electromagnetic coil probe is used to collect magnetic signal parameters in a non-destructive and only contact manner on the surface of the plane carburized sample. The magnetic signal includes the tangential magnetic field intensity time signal and the Barkhausen noise signal. , incremental magnetic permeability signal and multi-frequency eddy curren...

Embodiment

[0054] Utilize the inventive method to gather experimental data, have carried out preliminary data processing according to experimental data, find that data correlation coefficient r ∧ 2 is lower than 0.7857 in the calculation process, less than 0.8, data correlation is relatively poor, analysis causes the reason of this phenomenon to be, In the process of data collection and entry, some invalid data existed due to the influence of material surface quality or operational errors. After statistical combing, this part of the data was deducted, and the curve was corrected to obtain a better correlation coefficient. The experimental results Such as figure 1 , Figure 2a-2d shown.

[0055] After obtaining the curve and detection equation, take carburized sample blocks with different depths of carburized layers for testing, and test the tested samples by metallographic method, and compare the test results. The comparison results are shown in Table 2 and Table 3 . According to the ...

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Abstract

The invention discloses a planar carburizing sample determination method based on a magnetic method, and belongs to the field of bearing detection. The invention aims to solve the problems that the existing carburized layer detection method cannot guarantee the detection efficiency and accuracy at the same time and cannot achieve 100% detection. The method comprises the following steps: establishing a database of magnetic signals and infiltrated layer depths in equipment software, searching optimal function matching between the magnetic signals and the infiltrated layer depths by adopting an analysis mode of a least square method, and finally obtaining a polynomial equation with a correlation coefficient close to 1. Through verification, the function relationship between the magnetic signal and the infiltrated layer depth value can be reasonably established, so that the infiltrated layer depth value can be calculated by measuring the magnetic signal parameter on the surface of the carburized sample by adopting a nondestructive method, and finally, the infiltrated layer depth detection of the plane carburized sample is carried out in a nondestructive manner by adopting the magnetic method. The method is used for detecting the carburized layer sample.

Description

technical field [0001] The invention relates to a method for measuring a plane carburized sample based on a magnetic method. It belongs to the field of bearing detection. Background technique [0002] In the bearing processing process, carburizing treatment is an important process. The quality of the working surface of the bearing directly affects the working performance of the bearing surface. The unqualified or uneven depth of the carburized layer after carburizing and strengthening is a common problem in the current bearing manufacturing and processing process. Problems. [0003] At present, the non-destructive metallographic method and microhardness method are generally used for the detection of carburized layer. The metallographic method means that the parts are subjected to corresponding heat treatment after carburizing, and the depth of the carburized layer is determined by analyzing the structure obtained after heat treatment. The detection accuracy is low and micro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90
CPCG01N27/90
Inventor 刘璐莹赵强丛兵兵刘晓宇王世宇
Owner AVIC HARBIN BEARING
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