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A comparison sample preparation method for thermal damage eddy current testing acceptance criteria

An eddy current testing and acceptance standard technology, applied in the field of comparative sample making and thermal damage eddy current testing acceptance standards, can solve the problem of difficult to obtain burn defect samples, and achieve a true and reliable judgment conclusion, obvious effect, and easy-to-control production process. Effect

Active Publication Date: 2022-05-03
LANDING GEAR ADVANCED MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a solution to the problem that there are differences between burn defects produced by laser heating or tempering heat treatment and grinding burn defects in the prior art, and it is difficult to obtain burn defect samples of different severity by grinding. A comparative sample preparation method for thermal damage eddy current testing acceptance criteria, using the method of grinding to generate heat to make burn defects, which is extremely representative of the grinding and burn defects of actual workpieces, using the method of layered removal of the burn surface Make grinding burn defects of different severity, the operation is simple and controllable, and can be used for the judgment of thermal damage eddy current testing after actual workpiece grinding and the calibration of eddy current testing equipment

Method used

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  • A comparison sample preparation method for thermal damage eddy current testing acceptance criteria
  • A comparison sample preparation method for thermal damage eddy current testing acceptance criteria
  • A comparison sample preparation method for thermal damage eddy current testing acceptance criteria

Examples

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Embodiment 1

[0035] Such as figure 1 As shown, a method for making a comparison sample for the acceptance criteria of thermal damage eddy current testing provided in this embodiment includes the following steps:

[0036] 1. Making samples

[0037] Select 300M round steel and make it into solid cylindrical sample 1# by machining. The size of sample 1# is Ф180mm×80mm. The central axis direction of sample 1# is consistent with the rolling direction. Make an eccentric top hole on both ends of # respectively, and the connection line between the two eccentric top holes is parallel to the direction of the central axis.

[0038] In this embodiment, the eccentric tip hole deviates from the central axis of sample 1# by 1 mm, has a diameter of 20 mm, a depth of 30 mm, and a chamfer of 2×30°. The purpose of setting the eccentric center hole in this way is to make the burn defect produced later is a partial surface instead of the entire circumferential surface, so that the obtained burn defect is als...

Embodiment 2

[0058] 1. Steps 1-6 in Example 1 were used to make sample 3# with severe burn defects.

[0059] 2. Make burn defects between severe burn defects and minor burn defects

[0060] For sample 3#, use normal grinding parameters to grind the entire circumferential surface several times, and the removal amount of each grinding is 0.005mm. The white surrounded by dark black or dark black gradually changes to a color between dark gray and dark black, that is, from a severe burn defect to a burn defect between a severe burn defect and a slight burn defect, and the result is between a severe burn defect and a slight burn defect. Burn defect sample 3# between burn defect and slight burn defect.

[0061] 3. Thermal damage eddy current testing

[0062] The thermal damage eddy current detection probe was used to scan the non-burned area and burned area of ​​sample 3#, and the obtained impedance amplitude was shown in Figure 4. It can be seen from Figure 4 that the impedance amplitude of th...

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Abstract

The invention discloses a comparison sample preparation method for thermal damage eddy current detection and acceptance criteria, which adopts the method of grinding to generate heat to produce burn defects, and the produced burn defects are consistent with the burn defects produced when the actual workpiece is improperly ground and processed , the produced burn defects are very representative, and the conclusions of thermal damage eddy current testing based on this sample are true and reliable; the production method is simple; the burn defect can be produced in the local area of ​​the cylindrical sample by using the method of eccentric center hole, which avoids the The entire circumferential surface is a burnt area, and the effect is obvious when it is used for eddy current testing and adjustment; the production process of grinding burn defects of different severity is easy to control, and after severe burn defects are first produced, then the burnt surface is removed by layering Grinding burn defects of different severity can be produced by this method, and the operation is simple and controllable. It can be used for the judgment of thermal damage eddy current detection and the calibration of eddy current detection equipment after the actual workpiece is ground.

Description

technical field [0001] The invention belongs to non-destructive testing technology, and in particular relates to a comparison sample preparation method used for acceptance criteria of thermal damage eddy current testing. Background technique [0002] When grinding high-strength steel workpieces, improper grinding parameters can easily cause grinding burns on the surface of the workpiece. Grinding burns can lead to premature failure of the workpiece or reduce fatigue life. Therefore, it is necessary to perform burn detection on the grinding surface. The traditional method of detecting burns is usually the acid etching method, but this method is a destructive detection method, and the acid and alkali in the detection process are harmful to the human body, and more importantly, this method can only detect visually accessible areas . At present, there is a new non-destructive testing method, that is, eddy current testing method. The appearance of this method has solved the prob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/44G01N1/32G01N27/72G01N27/90
CPCG01N1/44G01N1/32G01N27/725G01N27/90
Inventor 付能李志栋沙晓岗谢景新石尚王聪龚勤
Owner LANDING GEAR ADVANCED MFG