CN108469468A - Eddy-current method flaw detection steel ball control sample responsiveness determination method - Google Patents
Eddy-current method flaw detection steel ball control sample responsiveness determination method Download PDFInfo
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- CN108469468A CN108469468A CN201810700433.6A CN201810700433A CN108469468A CN 108469468 A CN108469468 A CN 108469468A CN 201810700433 A CN201810700433 A CN 201810700433A CN 108469468 A CN108469468 A CN 108469468A
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- control sample
- sample
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- eddy
- responsiveness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9073—Recording measured data
- G01N27/9086—Calibrating of recording device
Abstract
Eddy-current method flaw detection steel ball control sample responsiveness determination method, is related to eddy current inspection technical field.The present invention is to solve the problems, such as that existing steel ball control sample responsiveness degeneration determination method accuracy is low.Eddy-current method flaw detection steel ball control sample responsiveness determination method of the present invention, the detection parameters of Eddy current detector are set according to testing goal and sample defect situation；The test point that original Contrast's sample is placed on to Eddy current detector operates 3s~5s, record and preserve the testing result of the detection parameters of Eddy current detector and original Contrast's sample in operation process, in above-mentioned operation process under the conditions of the detection parameters of Eddy current detector, the test point that control sample to be determined is placed on to Eddy current detector operates 3s~5s, records and preserve the testing result of control sample to be determined；Two groups of testing results are compared, when the testing result of control sample to be determined is identical as the testing result of original Contrast's sample, then the responsiveness of control sample to be determined does not decay, otherwise decays.
Description
Technical field
The invention belongs to eddy current inspection technical fields.
Background technology
In the flaw detection of aircraft bearing steel ball surface defect in the test of control sample responsiveness, since steel ball itself is in sphere
Particularity, so for face crack detection generally use eddy-current method.This method using artificial contrast's sample method into
Row Defect Equivalent is evaluated, and control sample in use can because of protecting improper or the reasons such as be repeatedly detected and cause to wear,
Therefore responsiveness can be caused to degenerate.
In the prior art, the degree degenerated for above-mentioned responsiveness does not have good method to judge, typically merely by meat
Eye has seen whether scuffing to judge, therefore, it is determined that result is not accurate enough.When using manual eddy-current method test mode, due to depositing
In more serious lift-off, and it is difficult to realize entire spherical surface scanning, and then causes to identify whether steel ball overall surface is sent out completely
Raw response is degenerated.Therefore, a kind of responsiveness degeneration determination method that can be accurate, stable is found, for accurately judging steel ball whirlpool
The accuracy of the system stability and examination equivalent that flow flaw detection is all particularly significant, to ensureing the control of aircraft bearing steel ball surface defect
Play very important effect.
Invention content
The present invention is to solve the problems, such as that existing steel ball control sample responsiveness degeneration determination method accuracy is low, now carry
For eddy-current method flaw detection steel ball control sample responsiveness determination method.
Eddy-current method flaw detection steel ball control sample responsiveness determination method, includes the following steps：
Step 1：The detection parameters of Eddy current detector are set according to testing goal and sample defect situation；
Step 2：The test point that original Contrast's sample is placed on to Eddy current detector operates 3s~5s, records and preserves and operated
The testing result of the detection parameters of Eddy current detector and original Contrast's sample in journey, the testing result are fault location signal amplitude and material
Expect ambient noise amplitude；
Step 3：In step 2 operation process under the conditions of the detection parameters of Eddy current detector, control sample to be determined is placed
3s~5s is operated in the test point of Eddy current detector, records and preserve the testing result of control sample to be determined, original Contrast's examination
Sample is identical as the sample parameter of control sample to be determined；
Step 4：The testing result that step 2 and step 3 obtain is compared, when the detection of control sample to be determined
As a result when identical as the testing result of original Contrast's sample, then the responsiveness of control sample to be determined does not decay, otherwise waits for
The responsiveness of judgement control sample decays.
When the responsiveness of control sample to be determined decays, including following attenuation：
When control sample to be determined material Background noise amplitude be more than original Contrast's sample material Background noise amplitude,
When the fault location signal amplitude of control sample to be determined is equal to the fault location signal amplitude of original Contrast's sample, then comparison to be determined
Specimen surface generates abrasion；
When control sample to be determined fault location signal amplitude be less than original Contrast's sample fault location signal amplitude, wait sentencing
When determining the material Background noise amplitude of control sample equal to material Background noise amplitude, then control sample fault location to be determined exists
It is abnormal；
When control sample to be determined fault location signal amplitude be less than original Contrast's sample fault location signal amplitude, wait sentencing
The material Background noise amplitude for determining control sample is more than the material Background noise amplitude of original Contrast's sample, then to be determined to having a competition
Sample surface generates abrasion and fault location has exception.
When the responsiveness of control sample to be determined decays, judge whether the signal-to-noise ratio of control sample to be determined is more than
It is that then there is no degenerating, otherwise the control sample to be determined exists degenerates the control sample to be determined equal to 3.
Since most of aircraft bearing with steel ball is high-volume, more specifications, in spherical, generally used to improve detection efficiency
Automation equipment is detected, wherein in the presence of certain the case where running at high speed or move detection, therefore it is used to having a competition
Sample is easier to failure (responsiveness degeneration) occur.
Eddy-current method flaw detection steel ball control sample responsiveness determination method of the present invention, passes through meridian scan mode
It realizes spherome surface being fully deployed under eddy current probe, demarcates and compare using ambient noise amplitude and artificial defect amplitudes of hindering
Method judgement control sample vortex responsiveness situation, to determine whether exemplar still meets the detection under certain sensitivity, energy
It is enough accurately to find whether control sample fails at any time, judge whether its reliability and control sample need replacing, for steel ball
The detection reliability of defect plays an important role, and can effectively ensure that the reliability of detection process.
Description of the drawings
Fig. 1 is the flow chart of eddy-current method flaw detection steel ball control sample responsiveness determination method；
Fig. 2 is amplitude time history plot.
Specific implementation mode
Specific implementation mode one：Present embodiment is illustrated with 2 referring to Fig.1, the eddy-current method described in present embodiment is visited
Wound steel ball control sample responsiveness determination method, includes the following steps：
Step 1：Using AVIKO G Series Vortex detectors, using the expanding wheel suitable for corresponding ball size, according to
The detection parameters of testing goal and sample defect situation setting Eddy current detector, the detection parameters sets requirement of the Eddy current detector are as follows：
(1) frequency is 400KHz~1000KHz；
(2) flaw indication phase angle is 55 °~65 °, and flaw indication phase angle is differed with material noise phase angle；
(3) signal-to-noise ratio is more than or equal to 3；
(4) gain is -36dB~+12dB.
Step 2：Control sample conduct is hindered using size identical as control sample to be determined, alloy composition, the artificial of state
Original Contrast's sample, original Contrast's specimen surface are useful for verification eddy-current instrument system stability and examination equivalent size defect etc.
The artificial of grade hinders defect, and original Contrast's sample should be fresh sample.When test, control sample surface cannot have the oil of disturbed test
Fat, dirt, corrosion, oxide skin or other impurity influential on eddy current inspection.
Original Contrast's sample row is detected using miniature probe, miniature probe can eliminate non-directional and extend defect to commenting
Estimate the influence of signal, the distance between miniature probe and original Contrast's sample are 130 μm~150 μm, and original Contrast's sample is put
The test point set in Eddy current detector operates 3~5s, records and preserves the detection parameters of Eddy current detector and original Contrast's examination in operation process
The testing result of sample, the testing result are fault location signal amplitude and material Background noise amplitude.
Step 3：In step 2 operation process under the conditions of the detection parameters of Eddy current detector, using miniature probe to be determined
Control sample row detects, and the distance between miniature probe and control sample to be determined are 130 μm~150 μm, by comparison to be determined
The test point that sample is placed on Eddy current detector operates 3~5s, records and preserve the testing result of control sample to be determined.
Step 4：The testing result that step 2 and step 3 obtain is compared, when the detection of control sample to be determined
As a result when identical as the testing result of original Contrast's sample, then the responsiveness of control sample to be determined does not decay, otherwise waits for
The responsiveness of judgement control sample decays.
When the responsiveness of control sample to be determined decays, including following attenuation：
When control sample to be determined material Background noise amplitude be more than original Contrast's sample material Background noise amplitude,
When the fault location signal amplitude of control sample to be determined is equal to the fault location signal amplitude of original Contrast's sample, then comparison to be determined
Specimen surface generates abrasion；
When control sample to be determined fault location signal amplitude be less than original Contrast's sample fault location signal amplitude, wait sentencing
When determining the material Background noise amplitude of control sample equal to material Background noise amplitude, then control sample fault location to be determined exists
It is abnormal；
When control sample to be determined fault location signal amplitude be less than original Contrast's sample fault location signal amplitude, wait sentencing
The material Background noise amplitude for determining control sample is more than the material Background noise amplitude of original Contrast's sample, then to be determined to having a competition
Sample surface generates abrasion and fault location has exception.
When the responsiveness of control sample to be determined decays, judge whether the signal-to-noise ratio of control sample to be determined is more than
It is that then there is no degenerating, otherwise the control sample to be determined exists degenerates the control sample to be determined equal to 3.
The above method in practical application, sample will produce an amplitude curve figure with time change when detecting,
As shown in Fig. 2, sample ambient noise peak point can be obtained and manually hinder the signal amplitude of fault location, with height percent shape
Formula indicates.Control sample to be determined occurs defect compared with original Contrast's Specimen Determination value and shows width under certain detection parameters
Value is obviously reduced or when ambient noise apparent increase, illustrates that control sample responsiveness to be determined is degenerated, when defect show amplitude with
Maximum noise amplitude ratio is less than 3:It fails when 1, control sample need to be updated.
The present invention is monitored for aircraft bearing steel ball eddy current inspection control sample responsiveness, determines if to fail, and is led to
The determination surface defects detection vortex control sample responsiveness decline situation that this method can be accurate, stable is crossed, is effectively judged
The validity of control sample.Solve the problems, such as that no suitable steel ball eddy current inspection control sample validity determines method.
Claims (7)
1. eddy-current method flaw detection steel ball control sample responsiveness determination method, which is characterized in that include the following steps：
Step 1：The detection parameters of Eddy current detector are set according to testing goal and sample defect situation；
Step 2：The test point that original Contrast's sample is placed on to Eddy current detector operates 3s~5s, records and preserves in operation process
The testing result of the detection parameters and original Contrast's sample of Eddy current detector, the testing result are that fault location signal amplitude and material are carried on the back
Scape noise amplitude；
Step 3：In step 2 operation process under the conditions of the detection parameters of Eddy current detector, control sample to be determined is placed on whirlpool
The test point for flowing instrument operates 3s~5s, records and preserve the testing result of control sample to be determined, original Contrast's sample with
The sample parameter of control sample to be determined is identical；
Step 4：The testing result that step 2 and step 3 obtain is compared, when the testing result of control sample to be determined
When identical as the testing result of original Contrast's sample, then the responsiveness of control sample to be determined does not decay, otherwise to be determined
The responsiveness of control sample decays.
2. eddy-current method flaw detection steel ball control sample responsiveness determination method according to claim 1, which is characterized in that wait for
When the responsiveness of judgement control sample decays, including following attenuation：
When control sample to be determined material Background noise amplitude be more than original Contrast's sample material Background noise amplitude, wait sentencing
When determining the fault location signal amplitude of control sample and being equal to the fault location signal amplitude of original Contrast's sample, then control sample to be determined
Surface generates abrasion；
When control sample to be determined fault location signal amplitude be less than original Contrast's sample fault location signal amplitude, it is to be determined right
When material Background noise amplitude than sample is equal to material Background noise amplitude, then there are different for control sample fault location to be determined
Often；
When control sample to be determined fault location signal amplitude be less than original Contrast's sample fault location signal amplitude, it is to be determined right
Than the material Background noise amplitude that the material Background noise amplitude of sample is more than original Contrast's sample, then control sample table to be determined
Face generates abrasion and fault location has exception.
3. eddy-current method flaw detection steel ball control sample responsiveness determination method according to claim 1 or 2, feature exist
In when the responsiveness of control sample to be determined decays, judging whether the signal-to-noise ratio of control sample to be determined is more than or equal to
3, it is that then there is no degenerating, otherwise the control sample to be determined exists degenerates the control sample to be determined.
4. eddy-current method flaw detection steel ball control sample responsiveness determination method according to claim 3, which is characterized in that institute
It includes size, material, machining state and defect state to state sample parameter, and the defect state includes people caused by process
Industrial injury and natural flaw.
5. eddy-current method flaw detection steel ball control sample responsiveness determination method according to claim 3, which is characterized in that step
The detection parameters sets requirement of a rapid Eddy current detector is as follows：
Frequency is 400KHz~1000KHz；
Flaw indication phase angle is 55 °~65 °, and flaw indication phase angle is differed with material noise phase angle；
Signal-to-noise ratio is more than or equal to 3；
Gain is -36dB~+12dB.
6. eddy-current method flaw detection steel ball control sample responsiveness determination method according to claim 3, which is characterized in that adopt
Original Contrast's sample or control sample to be determined are detected with miniature probe, and miniature probe and original Contrast's sample or waited for
Judge that the distance between control sample is 130 μm~150 μm.
7. eddy-current method flaw detection steel ball control sample responsiveness determination method according to claim 3, which is characterized in that whirlpool
Stream instrument is AVIKO G Series Vortex detectors.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111380952A (en) * | 2018-12-29 | 2020-07-07 | 宝武特种冶金有限公司 | Nondestructive testing device and method for dirt and carburization defects of inner wall of seamless steel pipe |
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| JP2000310619A (en) * | 1999-04-28 | 2000-11-07 | Amatsuji Steel Ball Mfg Co Ltd | Eddy current flaw detector of steel sphere |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111380952A (en) * | 2018-12-29 | 2020-07-07 | 宝武特种冶金有限公司 | Nondestructive testing device and method for dirt and carburization defects of inner wall of seamless steel pipe |
| CN111380952B (en) * | 2018-12-29 | 2023-05-19 | 宝武特种冶金有限公司 | Nondestructive testing device and method for dirt and carburization defects of inner wall of seamless steel tube |
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