CN103335926B - Method for measuring concentration of magnetic suspension for magnetic powder inspection - Google Patents
Method for measuring concentration of magnetic suspension for magnetic powder inspection Download PDFInfo
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- CN103335926B CN103335926B CN201310264792.9A CN201310264792A CN103335926B CN 103335926 B CN103335926 B CN 103335926B CN 201310264792 A CN201310264792 A CN 201310264792A CN 103335926 B CN103335926 B CN 103335926B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000006247 magnetic powder Substances 0.000 title claims abstract description 20
- 239000000725 suspension Substances 0.000 title claims abstract description 19
- 238000007689 inspection Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 34
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 32
- 230000033001 locomotion Effects 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims description 32
- 239000013049 sediment Substances 0.000 claims description 30
- 230000008021 deposition Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 12
- 230000007547 defect Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000011088 calibration curve Methods 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 3
- 238000011179 visual inspection Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000006249 magnetic particle Substances 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- 230000005426 magnetic field effect Effects 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
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- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention relates to a method for measuring concentration of magnetic suspension for magnetic powder inspection, also relates to a corresponding device, and belongs to the technical field of material defect detection. The method comprises the steps of building a reference unit which can calibrate the concentration of the magnetic suspension, obtaining a reference standard sample after relative movement of the reference unit in a magnetic field, obtaining a group of electromagnetic induction measured values, building a change relation curve between the electromagnetic induction measured values and the magnetic suspension concentrations in a two-dimensional coordinate system, obtaining a flatly deposited to-be-tested sample, and determining the corresponding magnetic suspension concentration value according to the change relation curve.The invention breaks the convention of visual inspection in measurement of the existing technology, realizes the scientific quantitative measurement on the magnetic powder content in the magnetic suspension by instruments and the calibration curve, and has the remarkable advantages of being accurate, rapid, simple and convenient to operate, and the like.
Description
Technical field
The present invention relates to a kind of measuring method of Non-Destructive Testing material, especially a kind of concentration of magnetic suspension for magnetic powder inspection measuring method, also relates to corresponding device simultaneously, belongs to technical field of material flaw detection.
Background technology
Magnetic testing is a kind of lossless detection method utilizing magnetic phenomenon to detect ferrimagnet surface of the work and near surface flaw.Its ultimate principle is: when workpiece is magnetized, due to the existence of uncontinuity defect, the magnetic line of force on surface of the work and nearly surface is made local distortion to occur and produce stray field, absorption is applied to the magnetic of surface of the work, under suitable illumination, form visual visible magnetic trace, thus demonstrate the position of uncontinuity defect, size, shape and the order of severity.
Magnetic powder detection method, according to carrier fluid used in testing process or carrier difference, can be divided into wet method to detect and dry method detection.Wet method comparatively dry method detects, and has that detection efficiency is high, magnetic flaw detection ink is recyclable, a detection sensitivity advantages of higher to surface of the work tiny flaw, applies more extensive.And an index very important to the evaluation of magnetic flaw detection ink is Particle content in wet method detection, the sensitivity impact of this concentration on display defect is very large, and concentration is different, and magnetic particle testing sensitivity is also different.Concentration is too low, affects the adsorbance of stray field to magnetic, and magnetic particle indications is unintelligible thus cause undetected; Concentration is too high, can be detained a lot of magnetic, form excessive background, likely cause subterranean weakness magnetic particle indications at surface of the work.In addition, when wet method Magnetic testing is carried out to different workpiece, suitable Particle content should be selected according to the surface state of workpiece.Under normal circumstances, the magnetic flaw detection ink that forging that shaggy foundry goods wants specific surface bright and clean selects concentration higher is detected.Therefore, regularly, fast, quantitatively, accurately grasp the size of Particle content in Magnetic testing process, to guarantee detection sensitivity and result reliability, avoid erroneous judgement, leak visit very important.
The method of existing magnetic powder inspection technology controlling and process Particle content is the qualified bound scope that the milliliter number precipitated in pyriform sediment tube (100ml) with magnetic demarcates (namely determining) Particle content mostly.Relevant magnetic non-destructive testing standard specifies in table 1 the bound scope of qualified magnetic liquid concentration both at home and abroad.
The Particle content scope of table 1 correlation standard
The time of observing magnetic precipitation milliliter number in concentration sediment tube (100ml) specifies according to related standards, and oiliness carrier fluid magnetic flaw detection ink is observed after needing within 1 hour, precipitate, and water carrier fluid magnetic flaw detection ink needs to observe after 30 minutes.
Reflect in practice that there are the following problems:
1) observe the magnetic settling time in concentration sediment tube oversize (oiliness carrier fluid 1 hour, water carrier fluid 30 minutes) in magnetic flaw detection ink, be unfavorable for ensureing normally carrying out of production.
2) observe the concentration of particle content in the milliliter number reflection magnetic flaw detection ink of magnetic precipitation in concentration sediment tube, be easy to by magnetic flaw detection ink pollutant (dust, staple foreign material, greasy dirt etc.) impact, accuracy of detection is lower, is difficult to obtain testing result accurately.
Summary of the invention
Primary and foremost purpose of the present invention is: for above-mentioned prior art Problems existing, proposes a kind of concentration of magnetic suspension for magnetic powder inspection measuring method that quick and precisely can obtain testing result, provides corresponding device simultaneously.
Further aim of the present invention is: propose a kind of concentration of magnetic suspension for magnetic powder inspection measuring method that more fast, accurately can obtain testing result, provide corresponding device simultaneously.
In order to reach above primary and foremost purpose, concentration of magnetic suspension for magnetic powder inspection measuring method of the present invention comprises the following steps:
Step one, general's at least three predetermined qualities (such as 0.1 gram, 0.2 gram,) magnetic put into the concentration sediment tube of respective amount respectively, the liquid medium (oiliness carrier fluid or water carrier fluid) demarcating volume (demarcating volume by relevant criterion is 100ml) is injected again respectively, as the reference cell demarcating Particle content in each concentration sediment tube;
Step 2, do relative motion using as the uniform magnetic field demarcating the reference cell of Particle content and put into predetermined strength, make magnetic uniform settling in concentration sediment tube, obtain the benchmark standard specimen that deposition is smooth;
Step 3, in the given time, puts into the electromagnetic induction coil that (one by one or simultaneously) is connected to Displaying Meter, obtains one group of electromagnetic induction measured value by benchmark standard specimen;
Step 4, being X, Y-coordinate with the quality of electromagnetic induction measured value and unit volume (can be equal with demarcating volume) interior magnetic respectively, setting up two-dimensional coordinate system, formation electromagnetic induction measured value and Particle content variation relation curve;
Step 5, the collection of use concentration sediment tube demarcate the magnetic flaw detection ink to be measured of the same liquid medium of volume, and the uniform magnetic field putting into predetermined strength does relative motion, makes magnetic uniform settling in concentration sediment tube, obtains the sample to be tested that deposition is smooth;
Step 6, in the given time, sample to be tested is put into the electromagnetic induction coil being connected to Displaying Meter, obtain electromagnetic induction measured value; And determine corresponding Particle content value by above-mentioned electromagnetic induction measured value with Particle content variation relation curve.
In order to reach further object, above-mentioned steps two is with step 5, make magnetic in concentration sediment tube in uniform settling process, apply a disturbed magnetic field (its change of magnetic field strength), magnetic sedimentation can be accelerated further like this, and avoid a small amount of magnetic to be adsorbed on tube wall thus guarantee accuracy of detection.
Further, described uniform magnetic field and disturbed magnetic field are formed by horizontal circle coil, and the radial direction of described wound coil is vertical with concentration sediment tube direction of motion.The magnetic field intensity of described disturbed magnetic field changes with sinusoidal rule.The uniform magnetic field that predetermined strength put into by concentration sediment tube does at the uniform velocity relative motion.
The present invention breaches in existing magnetic powder inspection technique the routine measured Particle content and detect by an unaided eye, by the device of calibration curve and quick and stable sedimentation magnetic and the quantitative measurment achieving science of carrying out particle content in magnetic flaw detection ink in conjunction with electromagnetic induction measurement mechanism, have accurately, fast, remarkable advantage such as grade easy and simple to handle.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is the magnetic suspension concentration measurement device for magnetic powder flaw detection structural representation of one embodiment of the invention.
Embodiment
Embodiment one
The magnetic suspension concentration measurement device for magnetic powder flaw detection of the present embodiment as shown in Figure 1, forms the horizontal circle coil 2 of uniform magnetic field after frame 1 being mounted with energising, the vertical lift device 8 that the top of horizontal circle coil 2 settles motor 3 to be driven by gear train.The positioned beneath energising of horizontal circle coil 2 controls the disturbance coil 9 forming disturbed magnetic field.Namely uniform magnetic field and disturbed magnetic field are formed by horizontal circle coil, and the radial direction of wound coil is vertical with concentration sediment tube direction of motion.Frame 1 both sides settle electromagnetic induction measurement mechanism 6 and Displaying Meter 7 respectively.Electromagnetic induction measurement mechanism 6 is made up of the electromagnetic induction coil 6-1 of bottom and the support 6-2 on top, and the signal output part of electromagnetic induction coil 6-1 connects display instrument 7.As electric elements installation site in frame 1.
When carrying out concentration of magnetic suspension for magnetic powder inspection measurement, carry out as follows:
Step one, the one group of predetermined grams 0.1 accurately will weighed with balance, 0.2,0.6 MPI fluorescent magnetic particles puts into one group of concentration sediment tube 4 respectively, the oiliness carrier fluid (water carrier fluid also can) demarcating volume 100ml will be injected respectively, as the reference cell demarcating Particle content again in each concentration sediment tube.Described oiliness carrier fluid can be the mixed liquor prepared by a certain percentage of transformer oil and kerosene or directly use tasteless kerosene, then adds appropriate magnetic, is oiliness magnetic flaw detection ink.Described water carrier fluid can be that mixed liquor prepared by a certain percentage by water and spreading agent, defoamer, rust preventive etc., after adding appropriate magnetic, is water-based magnetic flaw detection ink.
Step 2, the concentration sediment tube 4 as reference cell is placed in jacking gear 8 successively, starter motor 3, put it into in the uniform magnetic field at horizontal circle coil 2 center of Current Control predetermined strength gradually, relative magnetic field uniform motion, simultaneously by disturbed magnetic field effect, make magnetic rapid uniform settling in concentration sediment tube, obtain smooth, the loose dress of magnetic of deposition than consistent benchmark standard specimen.Disturbed magnetic field preferably changes with sinusoidal rule.
Step 3, within the 2-3min schedule time, be put into one by one by benchmark standard specimen on electromagnetic induction measurement mechanism 6, lower end enters and is connected in the electromagnetic induction coil 6-2 of Displaying Meter 7, obtains one group of electromagnetic induction measured value.
Step 4, be X, Y-coordinate with the predetermined grams of magnetic contained by electromagnetic induction measured value and 100ml oiliness carrier fluid (water carrier fluid also can) respectively, set up two-dimensional coordinate system, and according to predetermined grams described point in two-dimensional coordinate system of electromagnetic induction measured value corresponding to each benchmark standard specimen and magnetic, again each point smooth curve is connected, form electromagnetic induction measured value and Particle content variation relation curve.
Step 5, gather the magnetic flaw detection ink to be measured of 100ml same liquid medium at production scene concentration sediment tube, be placed in jacking gear 8, starter motor 3, put it into in the uniform magnetic field at horizontal circle coil 2 center of Current Control predetermined strength gradually, relative magnetic field uniform motion, simultaneously by disturbed magnetic field effect, make magnetic rapid uniform settling in concentration sediment tube, obtain the sample to be tested that deposition is smooth.
Step 6, within the 2-3min schedule time, sample to be tested is put on electromagnetic induction measurement mechanism 6, lower end enters and is connected in the electromagnetic induction coil 6-2 of Displaying Meter 7, obtains electromagnetic induction measured value, then determines corresponding Particle content value by above-mentioned variation relation curve.
The present embodiment establishes method of testing and the device of a set of Particle content accurately and rapidly.Direct quantitative can measure the particle content (mg/100ml) of magnetic flaw detection ink in concentration sediment tube, and not by non magnetic pollutant effects in magnetic flaw detection ink, not only increase the precision of detection, in real time obtain best Particle content scope under field working conditions simultaneously, instruct actual production, improve the precision ratio of defect there is vital role.
Facts have proved, from being sampled to, measuring method of the present invention determines that the time of the whole process of Particle content numerical value only needs 3-6 minute, detection speed and efficiency far are higher than domestic and foreign current standard regulation, and namely oiliness carrier fluid precipitates 1 hour, water carrier fluid observes magnetic subsidence volumn in concentration sediment tube after precipitating 30 minutes (or height).This device takes full advantage of uniform magnetic field, disturbed magnetic field is to the adjustment of magnetic rapid subsidence, magnetic flatness and reduce magnetic wall cling phenomenon role, thus reaches the technique effect of quick, steady precipitation magnetic.Wherein, uniform magnetic field mainly plays the sedimentation of acceleration magnetic, regulates the effect of magnetic flatness; Disturbed magnetic field also has acceleration magnetic settlement action, but it mainly plays minimizing magnetic wall cling phenomenon.In a word, the present embodiment measures the method for Particle content and overcomes the deficiency that Particle content in existing magnetic powder inspection technique measures long, complicated operation detection time, utilize the device of calibration curve and quick and stable sedimentation magnetic, accurate, the Quick Measurement to particle content in magnetic flaw detection ink is achieved in conjunction with electromagnetic detection, and the optimum value of Particle content under concrete operating mode can be provided rapidly, to the on-the-spot defects detecting technology of optimization, improve the accuracy rate detected and there is important directive function.
In addition to the implementation, the present invention can also have other embodiments.In theory, concentration sediment tube is inconsistent with the non-vertical relatively uniform Movement in Magnetic Field of other direction of motion, disturbed magnetic field and uniform magnetic field direction, is also feasible.In addition, in theory, the wound coil forming uniform magnetic field and the disturbance coil forming disturbed magnetic field both can be arranged respectively, also can unite two into one.Obviously, the inventive method is also applicable to the measurement of the Particle content of visible magnetic particle.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (5)
1. a concentration of magnetic suspension for magnetic powder inspection measuring method, is characterized in that comprising the following steps:
Step one, the magnetic of at least three predetermined qualities is put into respectively the concentration sediment tube of respective amount, then in each concentration sediment tube, inject the liquid medium demarcating volume respectively, as the reference cell demarcating Particle content;
Step 2, do relative motion using as the uniform magnetic field demarcating the reference cell of Particle content and put into predetermined strength, make magnetic uniform settling in concentration sediment tube, obtain the benchmark standard specimen that deposition is smooth;
Step 3, in the given time, benchmark standard specimen is put into the electromagnetic induction coil being connected to Displaying Meter, obtain one group of electromagnetic induction measured value;
Step 4, respectively with the quality of magnetic in electromagnetic induction measured value and unit volume be X, Y-coordinate, set up two-dimensional coordinate system, form electromagnetic induction measured value and Particle content variation relation curve;
Step 5, the collection of use concentration sediment tube demarcate the magnetic flaw detection ink to be measured of the same liquid medium of volume, and the uniform magnetic field putting into predetermined strength does relative motion, makes magnetic uniform settling in concentration sediment tube, obtains the sample to be tested that deposition is smooth;
Step 6, in the given time, sample to be tested is put into the electromagnetic induction coil being connected to Displaying Meter, obtain electromagnetic induction measured value; And determine corresponding Particle content value by above-mentioned electromagnetic induction measured value with Particle content variation relation curve.
2. concentration of magnetic suspension for magnetic powder inspection measuring method according to claim 1, is characterized in that: in described step 2 and step 5, make magnetic in concentration sediment tube in uniform settling process, apply a disturbed magnetic field.
3. concentration of magnetic suspension for magnetic powder inspection measuring method according to claim 2, it is characterized in that: in described step 4, predetermined grams described point in two-dimensional coordinate system of the electromagnetic induction measured value corresponding according to each benchmark standard specimen and magnetic, then each point smooth curve is connected into electromagnetic induction measured value and Particle content variation relation curve.
4. the concentration of magnetic suspension for magnetic powder inspection measuring method according to Claims 2 or 3, is characterized in that: described uniform magnetic field and disturbed magnetic field are formed by horizontal circle coil, and the radial direction of described wound coil is vertical with concentration sediment tube direction of motion.
5. concentration of magnetic suspension for magnetic powder inspection measuring method according to claim 4, is characterized in that: the magnetic field intensity of described disturbed magnetic field changes with sinusoidal rule, and the uniform magnetic field that predetermined strength put into by concentration sediment tube does at the uniform velocity relative motion.
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| CN104330408A (en) * | 2014-10-28 | 2015-02-04 | 南京化工特种设备检验检测研究所 | Antirust non-fluorescent water-based magnetic suspension and preparation method thereof |
| CN104330464A (en) * | 2014-10-28 | 2015-02-04 | 南京化工特种设备检验检测研究所 | Nonfluorescent oil-base magnetic suspension for magnetic powder flaw detection and preparation method of nonfluorescent oil-base magnetic suspension |
| CN105548343B (en) * | 2015-12-10 | 2018-12-25 | 浙江大学 | Detection method based on maglev part defect |
| CN107870140B (en) * | 2016-09-22 | 2019-12-27 | 宝山钢铁股份有限公司 | Device and method for calculating concentration of magnetic suspension in round steel magnetic powder flaw detection |
| RU175148U1 (en) * | 2017-06-06 | 2017-11-23 | Владимир Александрович Чуприн | Installation for magnetic particle inspection of products |
| CN114062211A (en) * | 2020-08-04 | 2022-02-18 | 中车沈阳机车车辆有限公司 | Magnetic suspension volume concentration detection method, detection system and magnetic powder flaw detection system |
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| CN85103661B (en) * | 1985-05-18 | 1987-05-27 | 西安交通大学 | Apparatus for measuring the concentration of magnetic suspended fluid |
| US5793199A (en) * | 1995-11-10 | 1998-08-11 | New Cosmos Electric Co., Ltd. | Method and apparatus for determining magnetic powder concentration by using the electromagnetic induction method |
| JP2006266723A (en) * | 2005-03-22 | 2006-10-05 | Toyota Motor Corp | Apparatus and method for inspecting coil damage |
| CN2809639Y (en) * | 2005-07-15 | 2006-08-23 | 曾德文 | Magnetic powder concentration sensor for magnetic suspension |
| US7614940B2 (en) * | 2006-03-23 | 2009-11-10 | Robert Bosch Gmbh | Accessory with hub for use with multiple types of rotary tool mandrels |
| CN202886327U (en) * | 2012-08-31 | 2013-04-17 | 爱德森（厦门）电子有限公司 | Device for carrying out online real-time dynamic monitoring on concentration of magnetic suspension |
| CN103063554A (en) * | 2012-12-28 | 2013-04-24 | 河北省电力公司电力科学研究院 | Rapid and qualitative measurement method for magnetic suspension solution concentration based on transmittance |
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