CN103076389B - Massive casting valve magnetic powder detection method - Google Patents
Massive casting valve magnetic powder detection method Download PDFInfo
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- CN103076389B CN103076389B CN201210569625.0A CN201210569625A CN103076389B CN 103076389 B CN103076389 B CN 103076389B CN 201210569625 A CN201210569625 A CN 201210569625A CN 103076389 B CN103076389 B CN 103076389B
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- 238000001514 detection method Methods 0.000 title claims abstract description 34
- 238000005266 casting Methods 0.000 title claims abstract description 16
- 239000006247 magnetic powder Substances 0.000 title claims description 3
- 238000007689 inspection Methods 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 43
- 238000012360 testing method Methods 0.000 claims abstract description 34
- 230000007547 defect Effects 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 230000005415 magnetization Effects 0.000 claims abstract description 15
- 230000035945 sensitivity Effects 0.000 claims abstract description 15
- 239000006249 magnetic particle Substances 0.000 claims abstract description 14
- 238000005286 illumination Methods 0.000 claims abstract description 9
- 238000009434 installation Methods 0.000 claims abstract description 7
- 238000012512 characterization method Methods 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims abstract description 4
- 238000012795 verification Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000002932 luster Substances 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 abstract description 4
- 239000000976 ink Substances 0.000 abstract 3
- 238000005516 engineering process Methods 0.000 description 9
- 208000037656 Respiratory Sounds Diseases 0.000 description 5
- 206010039509 Scab Diseases 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The present invention relates to a kind of new process of massive casting valve Magnetic testing.Its method step is: 1 pair of valve body surface processes; 2 pairs of valve body surface evenly spray contrast enhancement agents; Whether 3 inspection machines are in the verification term of validity; 4 configuration magnetic flaw detection inks, Particle content is within the scope of 10-25g/L; 5 by A
1-30/100 Calibration Piece for Sensitivity utilizes standard test piece stationary installation to be fixed on detected place, evaluates detection system combination property; 6 magnetize surface of the work with behind magnetic flaw detection ink wetted workpieces surface, adopt and exchange yoke continuity method, implement inspection according to valve body inspection Special magnetizing path profile to valve body; 7 utilize the vapour-pressure type watering can being applicable to the band illumination functions of magnetic particle inspection, observe immediately after magnetic trace is formed, and accomplish limit magnetization, magnetic flaw detection ink is sprayed on limit, limit is observed; 8 record detected parameters and defect magnetic traces, the defect magnetic trace according to display carries out classification according to characterization processes standard to workpiece quality, determines whether this workpiece detects qualified according to quality acceptance standard.As needs are reviewed, then readjust detection system sensitivity and workpiece is detected again, until meet the demands.The inventive method can carry out effective Magnetic testing to massive casting valve.
Description
Technical field
The present invention relates to a kind of new process of massive casting valve Magnetic testing, effective Magnetic testing can be carried out to massive casting valve according to this technique.
Technical background
In recent years, fuel-burning power plant shows massive casting valve leak phenomenon frequently, directly results in device damage, unit outage.Valve is widely used in power plant, chemical plant, petrochemical plant etc. as special equipment accessory, once lose efficacy to cause great economic loss and serious social influence.Carry out outgoing inspection to this type of valve at present, main external appearance and dimension inspection are main, and common Magnetic testing technique sampling observation is auxiliary, checks and accepts according to bulge test result; But occur that valve body is in operation because crackle causes the phenomenon of leaking to indicate such scheme and there is wretched insufficiency in the recent period.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of Magnetic testing new technology for massive casting valve, can carry out effective Magnetic testing according to this technique to massive casting valve.
technical scheme of the present inventionfor: massive casting valve Magnetic testing new technology of the present invention: its method step is:
1. pair valve body surface processes, and within the scope of Magnetic testing, the corrosion that all impacts detect, splashing and oxide skin all should give removing, exposing surface metallic luster.
2. pair valve body surface evenly sprays contrast enhancement agents.Scene contrast enhancement agents heating cabinet is used contrast enhancement agents to be heated to design temperature, generally at 20-50 DEG C before spraying.
3. whether inspection machine is in the verification term of validity.
4. configure magnetic flaw detection ink, Particle content is within the scope of 10-25g/L.
5. by A
1-30/100 Calibration Piece for Sensitivity utilizes standard test piece stationary installation to be fixed on detected place, evaluates detection system combination property, confirms that the Calibration Piece for Sensitivity back side has magnetic trace to assemble.
6. with behind magnetic flaw detection ink wetted workpieces surface, surface of the work is magnetized, adopt and exchange yoke continuity method, magnetizing time is 1-3s, stops executing magnetic flaw detection ink and at least can stop magnetization after 1s, yoke spacing 75mm is set, according to valve body inspection Special magnetizing path profile, inspection is implemented to valve body.
7. utilize the vapour-pressure type watering can being applicable to the band illumination functions of magnetic particle inspection, observe immediately after magnetic trace is formed, accomplish limit magnetization, magnetic flaw detection ink is sprayed on limit, limit is observed.
8. record detected parameters and defect magnetic trace, defect magnetic trace according to display carries out classification according to characterization processes standard to workpiece quality, determine whether this workpiece detects according to quality acceptance standard qualified, valve body surfaces externally and internally should be bright and clean, must not have the defects such as crackle, shrinkage cavity, scab, cold shut, solder skip, sand holes, loose and sharp-pointed cut.As needs are reviewed, then readjust detection system sensitivity and workpiece is detected again, until meet the demands.
principle of the present invention and research processbe:
Content of the present invention can be summarized as: one, adopt the pre-service of contrast enhancement agents heating cabinet realization to contrast enhancement agents; Two, standard test piece stationary installation is utilized to realize fixing standard test piece; Three, (yoke method clamps workpiece with fixed electromagnetic yoke two magnetic pole to carry out Overall magnetization, or carry out local magnetized, for finding the defect vertical with two magnetic pole lines with portable electric yoke two magnetic pole contact surface of the work to adopt interchange yoke continuity method.Exchanging yoke continuity method is a kind of existing common method), magnetizing time is 1-3s, stops executing magnetic flaw detection ink and at least can stop magnetization after 1s, arrange yoke spacing 75mm, implement inspection according to the valve body inspection Special magnetizing path profile of the present invention's exploitation to valve body; Four, utilize the vapour-pressure type watering can being applicable to the band illumination functions of magnetic particle inspection, observe immediately after magnetic trace is formed, accomplish limit magnetization, magnetic flaw detection ink is sprayed on limit, limit is observed.
First, should the factor that should consider massive casting valve magnetic particle inspection technics institution of first dissecting needle.
1. treatment
Because examined valve oxide skin is thicker, therefore expose metallic luster to polishing to tested position; Contrast enhancement agents should be used before inspection to be verified face contrast to increase simultaneously.
Contrast enhancement agents is widely used in magnetic particle inspection examined workpiece surface-treated assistant product as one.But when using in the winter time, Yin Wendu is too low, is difficult to contrast enhancement agents fully to shake up, uniform gasoloid cannot be sprayed, cause extend drying time, reduce work efficiency, and the uniform coating of thickness cannot be formed, affect test effect.Therefore, patent 201220205028.5 provides a kind of contrast enhancement agents heating cabinet.This new technology realizes the pre-service to contrast enhancement agents with this equipment.
2. standard test piece
Indispensable equipment when Magnetic testing standard test piece is Magnetic testing, its purposes is:
(1) for checking the combination property (system sensitivity) of Magnetic testing equipment, magnetic and magnetic flaw detection ink;
(2) for detecting the magnetic direction on examined workpiece surface, effective magnetizing district and roughly effective magnetic field intensity;
(3) for investigate defects detecting technology code used and method of operating whether appropriate;
(4) when cannot the magnetization specification of calculation of complex workpiece time, the little and test piece of softness is attached to the different parts of complex part, roughly can determines comparatively ideal magnetization specification.
For this special-shaped workpiece, owing to adopting commonsense method standard test piece to be difficult to be fixed on valve body variable cross section place, and seem extremely important to sensitivity evaluation herein, patent 201220205026.6 provides a kind of standard test piece stationary installation being applicable to magnetic particle inspection.This new technology realizes standard test piece fixing on each position of valve body with this device.
3. Magnitizing method
Common Magnitizing method has current flow method, contact method, coil method, yoke method etc.For the Large Abnormal Castings of this site layout project, current flow method etc. are difficult to implement.This new technology utilizes yoke method to test, but detecting of defect could be realized because yoke need be put into the direction being conducive to defect detection by yoke method, Workpiece inspection for complex geometry is more difficult, therefore the magnetic path of science must be formulated, to increase the detection sensitivity of key position, prevent the undetected of harmfulness crack defect.
4. key position
The key position of this massive casting valve should be specified when formulating magnetization technology, ensure the detection sensitivity of key position, guarantee that the defect of all directions is all detected.
From the production casting process analyzing valve, easily occur that the key position of defect is: preprocessing place of the joint of all cast gates, rising head and foundry goods, the abrupt change of cross-section and weld seam termination.
From the key position analyzing valve stress distribution situation determination valve be in operating conditions: shoulder, valve body variable cross section.
Draw thus, the key position of this valve magnetic particle inspection should be shoulder and valve body variable cross section place.Therefore Special magnetizing path profile must be formulated to realize the emphasis inspection of key position.
5. valve body inspection Special magnetizing path profile
Common yoke method inspection process utilizes portable yoke instrument bipod to stand on valve body to implement continuous magnetization to position, intermediate portion, also do not have special technological requirement to the inspection of shoulder.
There is the part direction such as key positions such as yoke spacing is uncontrollable, magnetization current type does not specify, shoulder defect and undetected, may examine position and not examine position and the drawback such as cannot to distinguish in the above-mentioned method of inspection.In order to find the defect in any direction of valve body, according to the valve magnetic particle inspection key position that above-mentioned analysis draws, spy have developed valve body inspection Special magnetizing path profile (as accompanying drawing 1), and dotted line represents magnetic path.Use and exchange yoke, yoke spacing 75mm is set, the quick test on a large scale of latticed non-blind area can be realized according to this valve body inspection Special magnetizing path profile, effectively raise the recall rate of defect.
6. the observation of defect
The observational technique of defect magnetic trace is directly connected to inspection net result.Patent 201220075814.8 provides a kind of vapour-pressure type watering can being applicable to the band illumination functions of magnetic particle inspection.When this equipment can realize magnetic particle inspection, light-illuminating angle and orientation and magnetic flaw detection ink spray position consistency, meet the illumination requirement being verified position, and then improve observation ability, improve quality inspection, increase work efficiency.And circuit water inlet is shone in the sprinkling that this equipment avoids magnetic flaw detection ink.Extend the serviceable life of equipment.The requirement of illuminance when this new technology meets Observation of Defects with this equipment.
beneficial effect of the present inventioncan be summarized as:
1, by contrast effect being strengthened to contrast enhancement agents heating pretreatment, uniform contrasting background is formed on examined workpiece surface;
2, standard test piece stationary installation is utilized to realize, to standard test piece fixing on special-shaped valve body, ensure that valve body magnetic particle inspection sensitivity.
3, have developed valve body inspection Special magnetizing path profile, achieve the quick test on a large scale of latticed non-blind area, the crackle being conducive to valve key position detects.
4, utilize the vapour-pressure type watering can being applicable to the band illumination functions of magnetic particle inspection, the illumination requirement being verified position can be met, improve quality inspection, and circuit water inlet is shone in the sprinkling avoiding magnetic flaw detection ink.Extend the serviceable life of equipment.
Adopt this Magnetic testing new technology can detect casting valve valve body crack defect, reduction valve body operational process causes the risk factor of leakage because of crackle, ensure that the person and device security.
Accompanying drawing explanation
Fig. 1 is valve body of the present invention inspection Special magnetizing path profile;
In figure, dotted line represents magnetic path.
Embodiment
Be below the process of the present invention one specific embodiment:
1. pair valve body surface processes, and within the scope of Magnetic testing, the corrosion that all impacts detect, splashing and oxide skin all should give removing, exposing surface metallic luster.
2. pair valve body surface evenly sprays contrast enhancement agents.Use scene contrast enhancement agents heating cabinet that contrast enhancement agents is heated to design temperature before spraying.
3. whether inspection machine is in the verification term of validity.
4. configure magnetic flaw detection ink, Particle content is within the scope of 10-25g/L.
5. by A
1-30/100 Calibration Piece for Sensitivity utilizes standard test piece stationary installation to be fixed on detected place, evaluates detection system combination property, confirms that the Calibration Piece for Sensitivity back side has magnetic trace to assemble.
6. with behind magnetic flaw detection ink wetted workpieces surface, surface of the work is magnetized, adopt and exchange yoke continuity method, magnetizing time is 1-3s, stop executing magnetic flaw detection ink and at least can stop magnetization after 1s, yoke spacing 75mm is set, according to valve body inspection Special magnetizing path profile (as shown in Figure 1), inspection is implemented to valve body.
7. utilize the vapour-pressure type watering can being applicable to the band illumination functions of magnetic particle inspection, observe immediately after magnetic trace is formed, accomplish limit magnetization, magnetic flaw detection ink is sprayed on limit, limit is observed.
8. record detected parameters and defect magnetic trace, defect magnetic trace according to display carries out classification according to characterization processes standard to workpiece quality, determine whether this workpiece detects according to quality acceptance standard qualified, valve body surfaces externally and internally should be bright and clean, must not have the defects such as crackle, shrinkage cavity, scab, cold shut, solder skip, sand holes, loose and sharp-pointed cut.
Claims (1)
1. massive casting valve magnetic powder detection method, is characterized in that its method step is:
(1). process valve body surface, within the scope of Magnetic testing, the corrosion that all impacts detect, splashing and oxide skin all should give removing, exposing surface metallic luster;
(2). evenly contrast enhancement agents is sprayed to valve body surface; Scene contrast enhancement agents heating cabinet is used contrast enhancement agents to be heated to design temperature, at 20-50 DEG C before spraying;
(3). whether inspection machine is in the verification term of validity;
(4). configuration magnetic flaw detection ink, Particle content is within the scope of 10-25g/L;
(5). by A
1-30/100 Calibration Piece for Sensitivity utilizes standard test piece stationary installation to be fixed on detected place, evaluates detection system combination property, confirms that the Calibration Piece for Sensitivity back side has magnetic trace to assemble;
(6). with behind magnetic flaw detection ink wetted workpieces surface, surface of the work is magnetized, adopt and exchange yoke continuity method, magnetizing time is 1-3s, stops executing magnetic flaw detection ink and at least can stop magnetization after 1s, yoke spacing 75mm is set, according to valve body inspection Special magnetizing path profile, inspection is implemented to valve body;
(7). utilize the vapour-pressure type watering can being applicable to the band illumination functions of magnetic particle inspection, observe immediately after magnetic trace is formed, accomplish limit magnetization, magnetic flaw detection ink is sprayed on limit, limit is observed;
(8). record detected parameters and defect magnetic trace, the defect magnetic trace according to display carries out classification according to characterization processes standard to workpiece quality, determines whether this workpiece detects qualified according to quality acceptance standard; As needs are reviewed, then readjust detection system sensitivity and workpiece is detected again, until meet the demands.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210569625.0A CN103076389B (en) | 2012-12-25 | 2012-12-25 | Massive casting valve magnetic powder detection method |
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| CN201210569625.0A CN103076389B (en) | 2012-12-25 | 2012-12-25 | Massive casting valve magnetic powder detection method |
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| CN103076389B true CN103076389B (en) | 2016-03-16 |
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| CN106018546B (en) * | 2016-07-11 | 2023-09-01 | 广东省特种设备检测研究院珠海检测院 | Test piece auxiliary device for magnetic powder detection sensitivity verification |
| CN106525958A (en) * | 2016-10-31 | 2017-03-22 | 广州电力机车有限公司 | Spring maintenance method |
| CN106940342B (en) * | 2017-04-14 | 2023-10-24 | 沧州市计量测试所 | Comprehensive calibration standard device of magnetic yoke type magnetic particle inspection machine |
| CN110398535B (en) * | 2019-08-13 | 2021-08-17 | 玉环市大众铜业制造有限公司 | Valve body detection method in valve production process |
| CN110376278B (en) * | 2019-08-20 | 2023-04-25 | 上海圣克赛斯液压股份有限公司 | Valve body detection method |
| CN110455912B (en) * | 2019-08-30 | 2023-07-11 | 广东省铭鸿通风设备有限公司 | Method for detecting surface dent of valve body |
| CN110726578A (en) * | 2019-10-22 | 2020-01-24 | 洛阳Lyc轴承有限公司 | Preposed sampling method for testing high-carbon chromium bearing steel carbide banding |
| CN111171635A (en) * | 2019-12-30 | 2020-05-19 | 苏州新美达探伤器材有限公司 | Anchor chain contrast enhancer and preparation method thereof |
| CN115100154B (en) * | 2022-06-29 | 2024-02-27 | 西安热工研究院有限公司 | Magnetic particle detection standard test piece magnetic mark evaluation method |
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Inventor after: Wang Qing Inventor after: Wang Qiang Inventor after: Niu Xiaoguang Inventor after: Chen Ersong Inventor after: Hao Xiaojun Inventor after: Zheng Xiangfeng Inventor after: Wu Nan Inventor after: Li Wenpeng Inventor after: Zhao Jifeng Inventor before: Wang Qiang Inventor before: Niu Xiaoguang Inventor before: Chen Ersong Inventor before: Wang Qing Inventor before: Hao Xiaojun Inventor before: Zheng Xiangfeng Inventor before: Wu Nan Inventor before: Li Wenpeng Inventor before: Zhao Jifeng |
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