CN108267502A - The eddy detection system and detection method of case depth - Google Patents
The eddy detection system and detection method of case depth Download PDFInfo
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- CN108267502A CN108267502A CN201611255456.8A CN201611255456A CN108267502A CN 108267502 A CN108267502 A CN 108267502A CN 201611255456 A CN201611255456 A CN 201611255456A CN 108267502 A CN108267502 A CN 108267502A
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- sample
- eddy current
- depth
- standard sample
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
Abstract
The present invention provides a kind of for detecting the eddy detection system of metallic hardfacing layer depth and a kind of detection method.The eddy detection system is included for the eddy current detecting equipment to detection target part progress EDDY CURRENT and the standard sample for calibrating the eddy current detecting equipment；The Stability and veracity of standard sample is improved by the preparation process for improving standard sample, also, influence of the disturbing factor to equipment is reduced by improving detection method, so as to improve the precision of EDDY CURRENT and stability.
Description
Technical field
The present invention relates to for detecting the eddy-current nondestructive detection system of metallic hardfacing layer depth and method.
Background technology
For the critical component of torque transmitting, such as camshaft and gear etc., the characteristic of force-bearing surfaces hardened layer is to it
Mechanical performance has important influence.Therefore, it is necessary to above-mentioned piece surface case depth is carried out in process of production effective
Detection.Traditional Metallographic Analysis method and microhardness analytic approach is the destructive detection side carried out by the sample to extraction
Method has the shortcomings that apparent：It is of high cost, efficiency is low, poor reliability, and the quality of production can not be traced in time.
Detection method of eddy be using metal surface physical characteristic, such as conductivity and magnetic conductivity variation to the action rule of eddy current signal
It is a kind of important method carried out non-destructive testing to metal surface come what is analyzed metal surface.
A kind of vortex inspection for measuring metallic hardfacing layer depth is disclosed in patent document CN200620098397.3
Instrument is surveyed, operation principle is：Metal material to be measured and standard metal material are respectively placed in two groups of complete phases of eddy current sensor
Between the primary and secondary of same induction coil, eddy current sensor then is encouraged with the signal of certain frequency and amplitude, by vortex
The output signal of sensor secondary induction coil is analyzed and processed to obtain the evaluation of estimate to metallic hardfacing layer depth to be measured.
A kind of constant velocity cardan joint double-station eddy current sensor detection is disclosed in patent document CN201320013358.9
Device carries out workpiece using the principle of magnetic effect of electric current the non-destructive testing of bar portion case depth.It is needed before workpiece sensing
Device is calibrated, that is, be placed in eddy current sensor with the standard component made in advance and form initial waveform figure, then adjusted point
The relevant parameter of analysis system is to corresponding numerical value.Then, workpiece for measurement is positioned, measured, and by measured value formed oscillogram with
The oscillogram of standard component carries out similarity comparison, to judge whether the case depth of workpiece is qualified.
However, in practical production detection process, since to eddy current detecting equipment, there are personnel, environment and standard samples
Etc. many influence factors so that detection method of eddy can not carry out metallic hardfacing layer depth accurate reliable measurement.
Therefore, how to prepare more reliable standard sample and how to reduce interference to EDDY CURRENT, improve vortex inspection
The accuracy and stability of survey are the subjects currently to be solved.
Invention content
In order to solve the above-mentioned technical problem, one aspect of the present invention provides a kind of vortex inspection for detecting metallic hardfacing layer
Examining system is improved by the preparation process to standard sample, so that the standard sample prepared has better reliability；
On the other hand a kind of detection method for detecting metallic hardfacing layer is provided, by the improvement to testing process, reduces survey
Influence of the disturbing factor to measurement result during examination, so as to improve the Stability and veracity of testing result.
It is according to the invention a kind of for detecting the eddy detection system of metallic hardfacing layer depth, it is treated including being used for
It surveys part and carries out the eddy current detecting equipment of EDDY CURRENT and the standard sample for demarcating the eddy current detecting equipment.
Wherein, the preparation process of the standard sample is as follows：
Step 1, it is prepared according to a series of identical hardening process parameters value C1 of production technology selection a series of with not
With the sample D1 of case depth；
Step 2, the case depth of above-mentioned sample D1 a series of is determined by metallographic method and hardness method；
Step 3, a series of hardening process parameters value C2 are determined according to the testing result to a series of above-mentioned sample D1, and
A series of sample D2 with different case depths are obtained according to a series of hardening process parameters value C2, wherein, it uses
Each hardening process parameters in C2 respectively make n sample；
Step 4, conformity classification is carried out to the sample in D2 by EDDY CURRENT；
Step 5, the case depth of D2 Plays samples is determined.
Wherein it is determined that the process of the case depth of D2 Plays samples is as follows, it is first, consistent at same group
M (m are chosen in D2 samples<N) a sample determines its hardened-depth angle value by metallographic method and hardness method, also, by these
Nominal case depth of the average value of hardened-depth angle value as this group of standard sample.
It is according to the invention a kind of for detecting the eddy current detection method of metallic hardfacing layer depth, wherein, this method
Include the following steps：Standard sample is prepared, initial alignment is carried out to eddy current detecting equipment with the standard sample, with the vortex
Detection device is detected part to be measured and eddy current detecting equipment is carried out with the standard sample intermediate calibration.
Wherein, the initial alignment to equipment includes the following steps:
S1：According to detection target zone selection criteria sample；
S2：Standard sample numerical value is inputted in eddy current detecting equipment；
S3：Demarcate EDDY CURRENT program；
S4：Judge whether correct to the measured value of standard sample.
The initial alignment to equipment can also include the following steps：
S5：Judge whether reliable to the measured value of sample to be tested.
Wherein, the judgement whether reliable to sample to be tested measured value is by the sample to be tested metallographic method
The hardened-depth angle value obtained with hardness method measurement with the hardened-depth angle value obtained with eddy-current method measurement compare
Go out.
Metallic hardfacing layer eddy current detection method as described above, wherein, the intermediate calibration to equipment includes as follows
Step:
S2：Standard sample numerical value is inputted in eddy current detecting equipment；
S3：Demarcate EDDY CURRENT program；
S4：Judge whether correct to the measured value of standard sample；
The intermediate calibration process to equipment periodically carries out.
By using the eddy detection system of the present invention, especially by improvement of the present invention to standard sample preparation process
And the improvement to test method, the Stability and veracity detected using vortex to metallic hardfacing layer depth is improved,
It is effectively guaranteed that product quality, improves production efficiency.
Description of the drawings
Fig. 1 schematically illustrates the flow that the present invention detects the method for metallic hardfacing layer depth.
Fig. 2 schematically illustrates the present invention and detects the stream that standard sample is determined in the method for metallic hardfacing layer depth
Journey.
Fig. 3 schematically illustrate a series of sample D1s of the method according to the invention during standard sample is determined and
D2。
Fig. 4 schematically illustrates the method according to the invention during standard sample is determined to the one of same group of sample
The screening of cause property.
Fig. 5 schematically illustrates the method according to the invention and same group of sample is hardened during standard sample is determined
The computational methods of layer depth.
Fig. 6 is schematically illustrated when the method according to the invention measures workpiece for measurement by using standard sample
The standard calibration curve that measured value fits determines the method for its case depth.
Specific embodiment
In order to which the technical solution and the advantageous effect of acquisition that make technical problem solved by the invention, use are more clear bright
In vain, the present invention is further described in detail with reference to the accompanying drawings and embodiments.
Fig. 1-Fig. 6 shows the preferred embodiment of the present invention.
As shown in Figure 1, before the vortex equipment is used to measure, first have to according to sample to be tested surface geometry parameter and
Surface physical properties select suitable Eddy current test coil or test probe.And to the suitable positioning side of sample to be tested selection
Formula, to improve the precision of test and efficiency.
Fig. 2 shows a kind of flows for preparing standard sample of the present invention.
When preparing standard sample, the allowed band of empirical value and part surface parameter to be measured, such as surface can be first depending on
The upper lower limit value of case depth obtains a series of hardening process parameters C1.Here, as shown in figure 3, when using electron beam to gold
Metal surface carry out cure process when, C1 can be the electron-beam curing equipment current value (A1, A2, A3, A4, A5, A6 ...,
Ax, Ay).Correspondingly, a series of sample D1 are prepared for by using above-mentioned hardening process parameters C1.By using metallographic method and micro-
Hardness method measures D1, can obtain D1 a series of hardened-depth angle value (d1, d2, d3, d4, d5, d6 ..., dx,
dy).Wherein, a series of above-mentioned hardened-depth angle value cover sample to be tested case depth bound.
Then, according to measurement it is specific need to choose from a series of above-mentioned sample D1 have hardened-depth angle value (d1,
D2, d5 ..., dy) a series of sample D2.According to the corresponding hardening process parameters C2 of D2 (A1, A2, A5 ..., Ay) with identical
Electron-beam curing equipment prepares sample using identical method for curing.Wherein, it is respectively made using each hardening process parameters in C2
It is standby go out one group of n sample.By carrying out EDDY CURRENT respectively to every group of sample, corresponding case depth vortex inspection can be obtained
Measured value D_WL.As shown in figure 4, n=10, the case depth EDDY CURRENT value of 10 samples is respectively D_WL_1 to D_ in the group
WL_10.Wherein, the measured value D_WL_1 to D_WL_9 included in dashed circle in figure has good consistency, and D_WL_
10 do not have enough consistency with other measured values, therefore are excluded and do not have to.
As shown in figure 5, choosing 4,6,8 and No. 9 samples in corresponding sample from above-mentioned D_WL_1 to D_WL_9 carries out metallographic
Method and hardness method measure, and obtain the hardened-depth angle value such as figure.Meet using their average value 0.33 as the group residue
The case depth of the sample of coherence request.In this way, just prepare the standard sample that one group of case depth is 0.33.
After all required standard samples are prepared, it is possible to carry out initial alignment to eddy current detecting equipment using them
.As shown in fig. 6, standard testing curve is fitted by the measured value of standard sample after calibration.
In order to reduce error, calibrated eddy current detecting equipment is also tested with standard sample.As shown in fig. 1,
If not being inconsistent with the testing result of standard sample and the hardened-depth angle value deviation of standard sample, restart measurement and prepared
Journey.Preferably, the Measurement reliability of eddy current detecting equipment is also examined with part to be measured after the inspection by standard sample.Its
In, the judgement whether reliable to sample to be tested measured value is by the sample to be tested metallographic method and microhardness
The hardened-depth angle value that method measurement obtains carries out what comparison obtained with the hardened-depth angle value obtained with eddy-current method measurement.If partially
Difference is excessive will also to restart to measure set-up procedure.
After having passed through the Measurement reliability of eddy current detecting equipment examined with part to be measured, it is possible to start to part to be measured
Formally have detected.As shown in fig. 6, when measuring, the hardened-depth angle value of workpiece for measurement can be by the detection signal of workpiece and upper
The standard testing curve stated determines jointly.
Since eddy current detecting equipment is to the sensibility of environment, the especially sensibility to temperature and electromagnetic field, therefore, in order to
The error that environment is brought is reduced, also needs to carry out eddy current detecting equipment periodically intermediate demarcate in detection process.Calibration
The step of be：
S2：Standard sample numerical value is inputted in eddy current detecting equipment；
S3：Demarcate EDDY CURRENT program；
S4：Judge whether correct to the measured value of standard sample.
Is preferably 1 hour.
In addition to Eddy current test method, the present invention also provides a kind of for detecting the inspection of the vortex of metallic hardfacing layer depth
Examining system, including being used to carry out the eddy current detecting equipment of EDDY CURRENT to detection target part and be set for calibrating the EDDY CURRENT
Standby standard sample；Wherein, the standard sample is prepared according to the method described above.
The specific embodiment of the present invention is described above by embodiment, it will be understood by those skilled in the art, however, that
The above embodiments are merely exemplary rather than limitation of the invention, and those skilled in the art are according to this hair
The equivalent modification and variation that bright spirit is made should all cover within the scope of the present invention.
Claims (9)
1. it is a kind of for detecting the eddy current detection method of metallic hardfacing layer depth, including the use of standard sample to EDDY CURRENT
Equipment carries out initial alignment and part to be measured is detected with the eddy current detecting equipment by initial alignment, wherein, institute
Standard sample is stated to prepare in accordance with the following methods：
Step 4, conformity classification is carried out, and exclude the examination not in the range of consistency to the sample D2 of preparation by EDDY CURRENT
Sample；
Step 5, the case depth of the sample in D2 in the range of consistency is determined, and as the hardening of corresponding standard sample
Layer depth.
2. it is described in accordance with the claim 1 for detecting the eddy current detection method of metallic hardfacing layer depth, wherein it is determined that D2
The process of the case depth of Plays sample is as follows, first, m examination is chosen in same group of consistent D2 sample
Sample, determines the hardened-depth angle value of the m sample by metallographic method and hardness method, also, by the m hardened-depth
Case depth of the average value of angle value as this group of standard sample.
3. according to claims 1 or 2 for the method for detecting metallic hardfacing layer depth, wherein, prepare the standard examination
The step of sample, further includes：
Step 1, it is prepared according to a series of identical hardening process parameters value C1 of production technology selection a series of with different hard
Change the sample D1 of layer depth；
Step 2, the case depth of above-mentioned sample D1 a series of is determined by metallographic method and hardness method；
Step 3, a series of hardening process parameters value C2 are determined according to the testing result to a series of above-mentioned sample D1, and according to
A series of hardening process parameters value C2 obtain a series of sample D2 with different case depths, wherein, using in C2
Each hardening process parameters respectively make n (n>M) a sample.
4. such as claims 1 or 2 for the method for detecting metallic hardfacing layer depth, wherein, the EDDY CURRENT set
Standby initial alignment includes the following steps:
S1：According to detection target zone selection criteria sample；
S2：Standard sample numerical value is inputted in eddy current detecting equipment；
S3：Demarcate EDDY CURRENT program；
S4：Judge whether correct to the measured value of standard sample.
5. the method as claimed in claim 4 for detecting metallic hardfacing layer depth, wherein, to the eddy current detecting equipment
Initial alignment further includes following steps:
S5：Judge whether the measured value of sample to be tested is reliable.
6. the method as claimed in claim 5 for detecting metallic hardfacing layer depth, wherein, it is described to sample to be tested measured value
Whether reliable judgement is case depth by being obtained to sample to be tested metallographic method and hardness method measurement
Value carries out what comparison obtained with the hardened-depth angle value obtained with eddy-current method measurement.
7. such as claims 1 or 2 for the method for detecting metallic hardfacing layer depth, wherein, it further includes with the standard
Sample demarcates the intermediate of the eddy current detecting equipment, and the intermediate calibration to the eddy current detecting equipment includes following step
Suddenly：
S2：Standard sample numerical value is inputted in eddy current detecting equipment；
S3：Demarcate EDDY CURRENT program；
S4：Judge whether correct to the measured value of standard sample.
8. the method as claimed in claim 7 for detecting metallic hardfacing layer depth, which is characterized in that described in equipment
Between calibration process periodically carry out.
9. it is a kind of for detecting the eddy detection system of metallic hardfacing layer depth, vortex inspection is carried out to part to be measured including being used for
The eddy current detecting equipment of survey and the standard sample for calibrating the eddy current detecting equipment；Wherein, the standard sample according to
It is prepared by the method in claim 1 to 2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611255456.8A CN108267502B (en) | 2016-12-30 | 2016-12-30 | Eddy current detection system and method for depth of hardened layer |
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| CN201611255456.8A CN108267502B (en) | 2016-12-30 | 2016-12-30 | Eddy current detection system and method for depth of hardened layer |
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| CN108267502B CN108267502B (en) | 2022-06-17 |
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| CN111413244A (en) * | 2019-01-04 | 2020-07-14 | 国电锅炉压力容器检验有限公司 | Calibration method of oxide skin detector |
| JP2020144084A (en) * | 2019-03-08 | 2020-09-10 | 新東工業株式会社 | Non-destructive inspection method for steel product |
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| CN108267502B (en) | 2022-06-17 |
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