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A metal material rolling contact fatigue test crack detection method

A technology for rolling contact fatigue and metal materials, which is applied to the analysis of materials, material magnetic variables, and the application of repeated force/pulsation force to test the strength of materials, etc., which can solve the problem of inability to more accurately evaluate the contact fatigue life of metal materials and the accuracy of test results Low, failure judgment accuracy and other problems, to achieve the effect of solving the contact fatigue failure of the sample surface, improving test efficiency and detection accuracy, and solving automatic detection problems

Active Publication Date: 2022-06-24
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A metal material rolling contact fatigue test crack detection method
  • A metal material rolling contact fatigue test crack detection method
  • A metal material rolling contact fatigue test crack detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In a method for detecting cracks in a rolling contact fatigue test of metal materials in this embodiment, the sample to be tested is a cylindrical sample with a diameter of 25.5 mm, the accompanying sample is a disk-shaped sample with a diameter of 75 mm, and the sample materials are all GCr15 Bearing steel, induction hardened, contact area width 5mm. like figure 1 As shown, the electromagnetic induction probe 2 of the electromagnetic induction analyzer 1 is fixed on the contact fatigue testing machine table, the center of the electromagnetic induction probe is facing the surface of the contact area of ​​the sample, and the self-induction coil end face of the electromagnetic induction probe is 0.5mm away from the surface of the sample , the coil diameter is 5mm. First use the GCr15 material calibration sample with 0.5mm diameter prefabricated cracks for calibration, open the electromagnetic induction analyzer to monitor the impedance signal, open the contact fatigue te...

Embodiment 2

[0040] In a method for detecting cracks in a rolling contact fatigue test of metal materials in this embodiment, the sample to be tested is a cylindrical sample with a diameter of 25.5 mm, the accompanying sample is a disk-shaped sample with a diameter of 75 mm, and the sample materials are all 20CrMnTi Low carbon alloy structural steel, carburized and quenched, contact area width 5mm. like figure 1As shown, fix the electromagnetic induction probe on the contact fatigue testing machine table, the center of the electromagnetic induction probe is facing the surface of the contact area of ​​the sample, the self-induction coil end face of the electromagnetic induction probe is 0.5mm away from the surface of the sample, and the coil diameter is 5mm. First, use the 20CrMnTi material calibration sample with 0.5mm diameter prefabricated cracks for calibration, open the electromagnetic induction analyzer to monitor the impedance signal, open the contact fatigue testing machine, make th...

Embodiment 3

[0042] In a method for detecting cracks in a rolling contact fatigue test of metal materials in this embodiment, the sample to be tested is a cylindrical sample with a diameter of 25.5 mm, the accompanying sample is a disk-shaped sample with a diameter of 75 mm, and the sample materials are all 20CrMnTi Low carbon alloy structural steel, carburized and quenched, contact area width 5mm. like figure 1 As shown, fix the electromagnetic induction probe on the contact fatigue testing machine table, the center of the electromagnetic induction probe is facing the surface of the contact area of ​​the sample, the self-induction coil end face of the electromagnetic induction probe is 0.3mm away from the surface of the sample, and the coil diameter is 3mm. First use the 20CrMnTi material calibration sample with 0.5mm diameter prefabricated cracks for calibration, open the electromagnetic induction analyzer to monitor the impedance signal, open the contact fatigue testing machine, make th...

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Abstract

The invention discloses a method for detecting cracks in metal material rolling contact fatigue tests. The method comprises the following steps: 1) conducting a rolling contact fatigue test on a calibration sample, and performing impedance detection at the same time to collect electromagnetic induction impedance signals; 2) according to the calibration test 3) Replace the calibration sample with the sample to be tested for rolling contact fatigue test, and perform impedance detection at the same time; 4) until the impedance signal of the sample to be tested is detected. mutation, and an alarm is issued when the set alarm threshold is reached, that is, the test of the sample to be tested is completed. The metal material rolling contact fatigue test crack detection method of the present invention can accurately judge the occurrence of contact fatigue cracking in the metal material rolling contact fatigue test in real time, greatly improve test efficiency and detection accuracy, and reduce test workload.

Description

technical field [0001] The invention belongs to the technical field of material testing, in particular to a method for detecting cracks in a rolling contact fatigue test of metal materials. 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 always been in the industry. This is a difficult point. At present, many methods are used in the industry to monitor vibration signals or to visually inspect surface defects on a regular basis, which have problems such as poor sensitivity and low test efficiency, respectively. [0003] In the prior art, Chinese invention patent CN103424307B discloses an accelerated test method for rolling contact fatigue of metallic materials with a small slip ratio. In this ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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