CN103968974A - Method for quantitative detection of non-destructive stress of ferromagnetic metal workpiece with coating - Google Patents
Method for quantitative detection of non-destructive stress of ferromagnetic metal workpiece with coating Download PDFInfo
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- CN103968974A CN103968974A CN201410205020.2A CN201410205020A CN103968974A CN 103968974 A CN103968974 A CN 103968974A CN 201410205020 A CN201410205020 A CN 201410205020A CN 103968974 A CN103968974 A CN 103968974A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 74
- 238000000576 coating method Methods 0.000 title claims abstract description 74
- 239000002184 metal Substances 0.000 title claims abstract description 69
- 230000005294 ferromagnetic effect Effects 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 230000001066 destructive effect Effects 0.000 title abstract description 4
- 230000005291 magnetic effect Effects 0.000 claims abstract description 36
- 238000012360 testing method Methods 0.000 claims description 26
- 230000008569 process Effects 0.000 claims description 19
- 230000006870 function Effects 0.000 claims description 18
- 239000012141 concentrate Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
- 239000003607 modifier Substances 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000006467 substitution reaction Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 description 13
- 230000006378 damage Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 2
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000011002 quantification Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009675 coating thickness measurement Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
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Abstract
The invention discloses a method for non-destructive quantitative detection of stress of a ferromagnetic metal workpiece with a coating. According to the method, a metal magnetic memory detection method, an eddy current detection method and a magnetic stress detection method are integrated, the coating on the surface of the ferromagnetic metal workpiece does not need to be removed during detection, and thus non-destructive, rapid and accurate quantitative detection of a stress value of a stress concentration portion of the ferromagnetic metal workpiece with the coating is achieved.
Description
Affiliated technical field
The present invention relates to a kind of lossless detection method, particularly relate to the non-failing stress quantitative detecting method of a kind of band coating ferromagnetic metal workpiece.
Background technology
Ferromagnetic metal workpiece is in use subject to the effect of operating load, occurs tired, deformation and produces micro-crack, causes occurring that stress concentrates, if do not find to carry out early repairing treatment, treat stress centralized development to a certain extent, workpiece fracture will occur, cause security incident.So reply ferromagnetic metal workpiece carries out early stage stress diagnosis, finds in time and measure the stress value that ferromagnetic metal workpiece stress is concentrated position, to its assess, repair process.Current have a multiple lossless detection method detecting for ferromagnetic metal workpiece stress, wherein metal magnetic memory detecting method can detect fast, accurately, reliably ferromagnetic metal workpiece stress and concentrate position, but cannot accurately measure the stress value of stress concentration portion position, magnetic strain detection method is determined the size of unrelieved stress by measuring the ferromagnetic material variation that magnetic permeability occurs under the effect of internal stress, can accurately measure ferromagnetic metal workpiece stress and concentrate the stress value at position, in testing process, require detection probe and tested ferromagnetic metal workpiece to fit tightly, ferromagnetic metal surface of the work is had relatively high expectations, before detection, need detection faces to carry out cleaning, ferromagnetic metal workpiece for band coating, because coating can affect the magnetic field intensity in magnetic loop, after needing coating polishing to remove before detection, just can obtain accurate stress value, this is for the ferromagnetic metal workpiece of band coating, it is a kind of destructive detection, after detection, also need again to recover coating, testing process is loaded down with trivial details, testing cost is higher.
Summary of the invention
The object of the invention is to overcome the deficiency of prior art, provide a kind of band coating ferromagnetic metal workpiece stress non-destruction quantitative detecting method, integrated metal magnetic memory detection, EDDY CURRENT, magnetic stress detect three kinds of detection methods, without removing ferromagnetic metal surface coating, realize band coating ferromagnetic metal workpiece stress and concentrate the non-destruction of position stress value, quick, accurate quantification detection.Three kinds of detection methods have respectively following features: metal magnetic memory detecting method is the magnetic memory characteristic that utilizes ferromagnetic metal workpiece, can accurately and reliably detect and on tested workpiece, take stress and concentrate the dangerous position as feature, in testing process without tested surface of the work is processed, detection speed is fast, is ferromagnetic metal workpiece is carried out to the effective ways that early stage stress is concentrated diagnosis; Eddy current detection method is conventional coating thickness measurement method, can accurately measure ferromagnetic metal surface coating thickness; Magnetic strain detection method is determined the size of unrelieved stress by measuring the ferromagnetic material variation that magnetic permeability occurs under the effect of internal stress, can accurately measure the stress value that ferromagnetic metal workpiece stress is concentrated position.
The technical solution adopted for the present invention to solve the technical problems is: the non-failing stress quantitative detecting method of a kind of band coating ferromagnetic metal workpiece, is characterized in that:
The first step, adopts the tested ferromagnetic metal workpiece of metal magnetic memory detecting method scanning band coating, detects the stress concentration portion position of the tested ferromagnetic metal workpiece of band coating;
Second step, adopts eddy current detection method to measure the surface coating one-tenth-value thickness 1/10 that the tested ferromagnetic metal workpiece stress of band coating is concentrated position;
The 3rd step, adopt magnetic strain detection method, first by calibration process, obtain stress value and coating thickness value relation function, the surface coating one-tenth-value thickness 1/10 correction then recording in applied stress value and coating thickness value relation function and second step in actual measurement process adopts magnetic strain pick-up unit directly to measure the stress value that the tested ferromagnetic metal workpiece stress of band coating is concentrated position, obtains the true stress value that the tested ferromagnetic metal workpiece stress of band coating is concentrated position; Described true stress value refers to removes after surface coating, adopts the tested ferromagnetic metal workpiece stress that magnetic strain pick-up unit measures to concentrate the stress value at position;
Detecting step has to be demarcated and two processes of actual measurement,
Calibration process is,
A. calibration sample is carried out to unidirectional tension and compression, make calibration sample produce stress and concentrate, adopt magnetic strain pick-up unit to measure the stress value of calibration sample stress concentration portion position; Described calibration sample is to select with tested ferromagnetic metal workpiece material, structure, stressless material that condition of heat treatment is identical to make;
B. the standard thickness test piece of a plurality of different-thickness is placed on surface, calibration sample stress concentration portion position successively to the stress value of the calibration sample stress concentration portion position while adopting magnetic strain pick-up unit to measure the test piece of placement different-thickness standard thickness; Described standard thickness test piece is made by the known nonmetallic materials of thickness, adopts standard thickness test piece simulation coating;
C. adopt the one-tenth-value thickness 1/10 of the standard thickness test piece of the stress value that records in step a, step b and a plurality of different-thickness, make stress value and standard test piece one-tenth-value thickness 1/10 relation curve, obtain stress value and standard test piece one-tenth-value thickness 1/10 relation function, this relation function is stress value and coating thickness value relation function;
Actual measurement process is,
D. adopt magnetic strain pick-up unit directly to measure the stress value that the tested ferromagnetic metal workpiece stress of band coating is concentrated position;
E. by the stress value and the coating thickness value relation function that obtain in the surface coating one-tenth-value thickness 1/10 substitution step c recording in second step, calculate stress modifier value;
F. by the stress modifier value calculating in step e, revise the tested ferromagnetic metal workpiece stress of band coating recording in steps d and concentrate the stress value at position, obtain the true stress value that the tested ferromagnetic metal workpiece stress of band coating is concentrated position.
The invention has the beneficial effects as follows, provide a kind of band coating ferromagnetic metal workpiece non-failing stress quantitative detecting method, integrated metal magnetic memory detection, EDDY CURRENT, magnetic stress detect three kinds of detection methods, in testing process, without removing ferromagnetic metal surface coating, realize band coating ferromagnetic metal workpiece stress and concentrate the non-destruction of position stress value, quick, accurate quantification detection.
Below in conjunction with embodiment, the present invention is described in further detail, but the non-failing stress quantitative detecting method of a kind of band coating ferromagnetic metal workpiece of the present invention is not limited to embodiment.
Embodiment
Embodiment, the non-failing stress quantitative detecting method of a kind of band coating ferromagnetic metal workpiece, is characterized in that:
The first step, adopts the tested ferromagnetic metal workpiece of metal magnetic memory detecting method scanning band coating, detects the stress concentration portion position of the tested ferromagnetic metal workpiece of band coating;
Second step, adopts eddy current detection method to measure the surface coating one-tenth-value thickness 1/10 that the tested ferromagnetic metal workpiece stress of band coating is concentrated position;
The 3rd step, adopt magnetic strain detection method, first by calibration process, obtain stress value and coating thickness value relation function, the surface coating one-tenth-value thickness 1/10 correction then recording in applied stress value and coating thickness value relation function and second step in actual measurement process adopts magnetic strain pick-up unit directly to measure the stress value that the tested ferromagnetic metal workpiece stress of band coating is concentrated position, obtains the true stress value that the tested ferromagnetic metal workpiece stress of band coating is concentrated position; Described true stress value refers to removes after surface coating, adopts the tested ferromagnetic metal workpiece stress that magnetic strain pick-up unit measures to concentrate the stress value at position;
Detecting step has to be demarcated and two processes of actual measurement,
Calibration process is,
A. calibration sample is carried out to unidirectional tension and compression, make calibration sample produce stress and concentrate, adopt magnetic strain pick-up unit to measure the stress value of calibration sample stress concentration portion position; Described calibration sample is to select with tested ferromagnetic metal workpiece material, structure, stressless material that condition of heat treatment is identical to make;
B. the standard thickness test piece of a plurality of different-thickness is placed on surface, calibration sample stress concentration portion position successively to the stress value of the calibration sample stress concentration portion position while adopting magnetic strain pick-up unit to measure the test piece of placement different-thickness standard thickness; Described standard thickness test piece is made by the known nonmetallic materials of thickness, adopts standard thickness test piece simulation coating;
C. adopt the one-tenth-value thickness 1/10 of the standard thickness test piece of the stress value that records in step a, step b and a plurality of different-thickness, make stress value and standard test piece one-tenth-value thickness 1/10 relation curve, obtain stress value and standard test piece one-tenth-value thickness 1/10 relation function, this relation function is stress value and coating thickness value relation function;
Actual measurement process is,
D. adopt magnetic strain pick-up unit directly to measure the stress value that the tested ferromagnetic metal workpiece stress of band coating is concentrated position;
E. by the stress value and the coating thickness value relation function that obtain in the surface coating one-tenth-value thickness 1/10 substitution step c recording in second step, calculate stress modifier value;
F. by the stress modifier value calculating in step e, revise the tested ferromagnetic metal workpiece stress of band coating recording in steps d and concentrate the stress value at position, obtain the true stress value that the tested ferromagnetic metal workpiece stress of band coating is concentrated position.
Above-described embodiment is only used for further illustrating the non-failing stress quantitative detecting method of a kind of band coating ferromagnetic metal workpiece of the present invention; but invention is not limited to embodiment; any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all fall in the protection domain of technical solution of the present invention.
Claims (1)
1. the non-failing stress quantitative detecting method of band coating ferromagnetic metal workpiece, is characterized in that:
The first step, adopts the tested ferromagnetic metal workpiece of metal magnetic memory detecting method scanning band coating, detects the stress concentration portion position of the tested ferromagnetic metal workpiece of band coating;
Second step, adopts eddy current detection method to measure the surface coating one-tenth-value thickness 1/10 that the tested ferromagnetic metal workpiece stress of band coating is concentrated position;
The 3rd step, adopt magnetic strain detection method, first by calibration process, obtain stress value and coating thickness value relation function, the surface coating one-tenth-value thickness 1/10 correction then recording in applied stress value and coating thickness value relation function and second step in actual measurement process adopts magnetic strain pick-up unit directly to measure the stress value that the tested ferromagnetic metal workpiece stress of band coating is concentrated position, obtains the true stress value that the tested ferromagnetic metal workpiece stress of band coating is concentrated position; Described true stress value refers to removes after surface coating, adopts the tested ferromagnetic metal workpiece stress that magnetic strain pick-up unit measures to concentrate the stress value at position;
Detecting step has to be demarcated and two processes of actual measurement,
Calibration process is,
A. calibration sample is carried out to unidirectional tension and compression, make calibration sample produce stress and concentrate, adopt magnetic strain pick-up unit to measure the stress value of calibration sample stress concentration portion position; Described calibration sample is to select with tested ferromagnetic metal workpiece material, structure, stressless material that condition of heat treatment is identical to make;
B. the standard thickness test piece of a plurality of different-thickness is placed on surface, calibration sample stress concentration portion position successively to the stress value of the calibration sample stress concentration portion position while adopting magnetic strain pick-up unit to measure the test piece of placement different-thickness standard thickness; Described standard thickness test piece is made by the known nonmetallic materials of thickness, and standard thickness test piece is used for simulating coating;
C. adopt the one-tenth-value thickness 1/10 of the standard thickness test piece of the stress value that records in step a, step b and a plurality of different-thickness, make stress value and standard test piece one-tenth-value thickness 1/10 relation curve, obtain stress value and standard test piece one-tenth-value thickness 1/10 relation function, this relation function is stress value and coating thickness value relation function;
Actual measurement process is,
D. adopt magnetic strain pick-up unit directly to measure the stress value that the tested ferromagnetic metal workpiece stress of band coating is concentrated position;
E. by the stress value and the coating thickness value relation function that obtain in the surface coating one-tenth-value thickness 1/10 substitution step c recording in second step, calculate stress modifier value;
F. by the stress modifier value calculating in step e, revise the tested ferromagnetic metal workpiece stress of band coating recording in steps d and concentrate the stress value at position, obtain the true stress value that the tested ferromagnetic metal workpiece stress of band coating is concentrated position.
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| CN201410205020.2A CN103968974B (en) | 2014-05-15 | 2014-05-15 | A kind of band coating ferromagnetic metal workpiece non-demolition stress quantitative detecting method |
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| CN201410205020.2A CN103968974B (en) | 2014-05-15 | 2014-05-15 | A kind of band coating ferromagnetic metal workpiece non-demolition stress quantitative detecting method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898182A (en) * | 2015-06-01 | 2015-09-09 | 广东省特种设备检测研究院 | Sample tube and verifying method for verifying test capability of stress concentration magnetic detector |
| CN114993367A (en) * | 2022-05-31 | 2022-09-02 | 山东电力工业锅炉压力容器检验中心有限公司 | A standard device and method for supervision and detection of metal equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06102104A (en) * | 1992-09-18 | 1994-04-15 | Kiyoshi Fukui | Magnetic force type stress measuring method of non-ferrous metal material |
| CN101718747A (en) * | 2009-12-18 | 2010-06-02 | 北京工业大学 | Method for discriminating stress concentration of ferromagnetic materials by utilizing detection of metal magnetic memory |
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- 2014-05-15 CN CN201410205020.2A patent/CN103968974B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06102104A (en) * | 1992-09-18 | 1994-04-15 | Kiyoshi Fukui | Magnetic force type stress measuring method of non-ferrous metal material |
| CN101718747A (en) * | 2009-12-18 | 2010-06-02 | 北京工业大学 | Method for discriminating stress concentration of ferromagnetic materials by utilizing detection of metal magnetic memory |
Non-Patent Citations (3)
| Title |
|---|
| 刘书俊: "金属磁记忆检测技术研究进展综述", 《化工机械》, vol. 38, no. 6, 31 December 2011 (2011-12-31), pages 663 - 665 * |
| 汪滨波等: "金属磁记忆检测技术的研究现状及发展", 《无损检测》, vol. 32, no. 6, 31 December 2010 (2010-12-31), pages 467 - 474 * |
| 爱德森（厦门）电子有限公司: "无损检测新方法-磁记忆效应原理与应用", 《热力发电》, no. 4, 31 December 2000 (2000-12-31), pages 62 - 63 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898182A (en) * | 2015-06-01 | 2015-09-09 | 广东省特种设备检测研究院 | Sample tube and verifying method for verifying test capability of stress concentration magnetic detector |
| CN114993367A (en) * | 2022-05-31 | 2022-09-02 | 山东电力工业锅炉压力容器检验中心有限公司 | A standard device and method for supervision and detection of metal equipment |
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