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Metal material rolling contact fatigue test crack detection method

A rolling contact fatigue and crack detection technology, which is applied in the analysis of materials, material magnetic variables, and the use of repeated force/pulsation force to test the strength of materials, etc., can solve the problem of inability to more accurately evaluate the contact fatigue life of metal materials and the accuracy of test results The problems such as low and failure judgment accuracy can solve the contact fatigue failure of the sample surface, reduce the test workload and improve the detection accuracy.

Active Publication Date: 2020-10-30
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The characteristic of the contact fatigue test is that there are many moving parts including motors and various bearings. In the test, these parts are all sources of vibration and noise, resulting in excessive background noise. The existence of system noise affects the accuracy of failure judgment, and the accuracy of the test results is not high. , so that it is impossible to more accurately evaluate the contact fatigue life of metal materials

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  • Metal material rolling contact fatigue test crack detection method
  • Metal material rolling contact fatigue test crack detection method
  • Metal material rolling contact fatigue test crack detection method

Examples

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Embodiment 1

[0038] A kind of metal material rolling contact fatigue test crack detection method of the present embodiment, the sample to be tested is a cylindrical sample with a diameter of 25.5mm, and the accompanying sample is a disc-shaped sample with a diameter of 75mm, and the sample materials are all GCr15 Bearing steel, induction hardened, contact area width 5mm. Such as figure 1 As shown, the electromagnetic induction probe 2 of the electromagnetic induction analyzer 1 is fixed on the table of the contact fatigue testing machine, the center of the electromagnetic induction probe is facing the surface of the sample contact area, and the end face of the self-induction coil of the electromagnetic induction probe is 0.5 mm away from the sample surface , Coil diameter 5mm. First use the GCr15 material calibration sample with a 0.5mm diameter prefabricated crack for calibration, turn on the electromagnetic induction analyzer to monitor the impedance signal, turn on the contact fatigue ...

Embodiment 2

[0040] A kind of metal material rolling contact fatigue test crack detection method of the present embodiment, the sample to be tested is a cylindrical sample with a diameter of 25.5 mm, the accompanying sample is a disc-shaped sample with a diameter of 75 mm, and the sample materials are 20CrMnTi Low carbon alloy structural steel, carburized and quenched, contact area width 5mm. Such as figure 1As shown, the electromagnetic induction probe is fixed on the table of the contact fatigue testing machine, the center of the electromagnetic induction probe is facing the surface of the contact area of ​​the sample, the end face of the self-induction coil of the electromagnetic induction probe is 0.5 mm away from the sample surface, and the coil diameter is 5 mm. First use the 20CrMnTi material calibration sample with a 0.5mm diameter prefabricated crack for calibration, turn on the electromagnetic induction analyzer to monitor the impedance signal, turn on the contact fatigue testing...

Embodiment 3

[0042] A kind of metal material rolling contact fatigue test crack detection method of the present embodiment, the sample to be tested is a cylindrical sample with a diameter of 25.5 mm, the accompanying sample is a disc-shaped sample with a diameter of 75 mm, and the sample materials are 20CrMnTi Low carbon alloy structural steel, carburized and quenched, contact area width 5mm. Such as figure 1 As shown, the electromagnetic induction probe is fixed on the table of the contact fatigue testing machine, the center of the electromagnetic induction probe is facing the surface of the contact area of ​​the sample, the end face of the self-induction coil of the electromagnetic induction probe is 0.3 mm away from the sample surface, and the coil diameter is 3 mm. First use the 20CrMnTi material calibration sample with a 0.5mm diameter prefabricated crack for calibration, turn on the electromagnetic induction analyzer to monitor the impedance signal, turn on the contact fatigue testin...

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Abstract

The invention discloses a metal material rolling contact fatigue test crack detection method, which comprises the steps of 1) carrying out a rolling contact fatigue test on a calibration sample, carrying out impedance detection at the same time, and collecting an electromagnetic induction impedance signal; 2) setting electromagnetic induction parameters of an alarm threshold according to an impedance detection result of a calibration sample; 3) replacing the calibration sample with a to-be-tested sample to carry out a rolling contact fatigue test, and carrying out impedance detection at the same time; and 4) when detecting that the impedance signal of the to-be-tested sample is suddenly changed and reaches a set alarm threshold, giving an alarm to finish the test of the to-be-tested sample. According to the metal material rolling contact fatigue test crack detection method, the occurrence of contact fatigue cracking in the metal material rolling contact fatigue test can be accurately judged in real time, the test efficiency and the detection precision are greatly improved, and the test workload is reduced.

Description

technical field [0001] The invention belongs to the technical field of material testing, and in particular relates to a method for detecting cracks in metal material rolling contact fatigue tests. Background technique [0002] The rolling contact fatigue test of metal materials is a test method that uses a cylindrical (or cylindrical convex belly) sample and an accompanying sample to evaluate the contact fatigue performance of the material through rolling contact. The surface contact fatigue failure detection of the sample has been in the industry It is a difficult point. At present, the methods of monitoring vibration signals or regular visual inspection of surface defects are mostly used in the industry, and there are problems such as poor sensitivity and low test efficiency. [0003] In the prior art, the Chinese invention patent CN103424307B discloses an accelerated test method for rolling contact fatigue of metal materials with a small slip rate. In this test method, th...

Claims

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Application Information

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IPC IPC(8): G01N3/32G01N3/02G01N1/28G01N27/82
CPCG01N3/32G01N3/02G01N1/286G01N27/82G01N2203/0005G01N2203/0073G01N2203/0266G01N2203/0635
Inventor 张先国郑立新李满良刘景超蔡松涛
Owner DONGFENG COMML VEHICLE CO LTD