CN1187603C - Automatic flaw detection method for crack detection by dye penetration method - Google Patents
Automatic flaw detection method for crack detection by dye penetration method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/91—Investigating the presence of flaws or contamination using penetration of dyes, e.g. fluorescent ink
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
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Abstract
The present invention relates to an automatic flaw detection method used during crack detection according to a dye penetrant method. According to the inventive method, the workpiece is treated with a penetrant containing dye, during which the dye is concentrated on the locations with surface defects and, after a predetermined development time, is recorded by at least one image recording device. In addition, the recorded image is evaluated for defect problems by scanning and identifying areas where the dye is concentrated in the image processing unit. The method comprises the following steps: recording an image of the same workpiece (10) at least two times t1, t2 after processing the workpiece with the penetrant, and selectively developing at least two recorded images a1, a2 when received; comparing the recorded images a1, a2 and evaluating the comparison result by means of an evaluation logic unit of the signal processing unit (22); outputting, by the evaluation logic unit, signals that depict a change in osmotic agent concentration over the entire time interval Δ t1, Δ t2 that is greater than a change threshold with respect to the reference time difference; and evaluating the measured workpiece-related parameters to generate an evaluation of the crack, e.g. a statement of good/bad, or a defect value evaluation according to a predetermined value interval or in a predetermined surface area.
Description
Technical field
The present invention relates to utilize dye penetration (dye penetrant method) to carry out the automatic flaw detection method of crack detection, the workpiece that wherein is used for the dyestuff penetration test is to utilize the bleeding agent that contains dyestuff to handle, so that dyestuff is concentrated on the surface imperfection, and process predetermined visualization (development) is after the time, note by at least one image recorder, in graphics processing unit, pass through scanning then and detect the zone that dyestuff is concentrated, this record is assessed defective that output at last is just detected and corresponding signal with regard to defect problem.
Background technology
In the production system of the workpiece that will carry out follow-on test such as productions such as continuous casting system, line end tests, it is well-known detecting a flaw by the automatic light of dyestuff penetration test.At present, utilize dyestuff to carry out the light assessment by described light image detection means from the image that workpiece obtains, by well-known dye penetration itself its visible defects that becomes is detected by photoscanning and image detection method, and compared by the defective logical relation of storage.Recently, because the lightweight non-ferrous metal such as aluminium or magnesium alloy and titanium alloy is used widely, for example, be used for aluminium beam, light-weight metal engine components etc., in addition, the range of application of stupalith also constantly enlarges, for example, be used for the shell of valve part, high stress portion etc., therefore, the dyestuff penetration test has caused people's interest again.Here related is in process control to non-magnetic workpiece, for example, and the routine inspection of the crackle in those workpiece that constitute by materials such as magnesium or aluminium alloy or potteries.
Therefore, here related is crack detecting method, in this method, in well-known mode itself, utilization contains the test agent of dyestuff, along with dyestuff concentrates on the surface imperfection, the workpiece that is used for the dyestuff penetration test is handled, then, passing through light irradiation apparatus, for example, the UV under the fluorescent dye situation (ultraviolet ray) light source, and under the irradiation of the lasing light emitter under the suitable absorbing dye situation or other light source, it is assessed.
In this case, usually prepare for the workpiece of dyestuff penetration test as follows, at first it is cleaned, words are if necessary carried out pickling, and make its exsiccation, utilize to contain dyestuff, especially the test agent of fluorescent dye is sprayed, along with dyestuff concentrates on the expression defective, especially on crackle, then, by, for example, the method for striking off or wiping eliminates the unnecessary dye test reagent that contains, if suitable, the workpiece of Chu Liing utilizes developer solution to handle again in this manner, then,, under UV or visible light effect, write down and assess after the time through predetermined visualization.Because it is very short to detect the time of crackle after developing easily, in less than one minute scope, therefore, should just in time in the specific reproducible time interval that follows closely after developing, measure usually.
Up to the present, these dye penetrant inspections are mainly carried out by operating personnel and are assessed by eyes.The applicant has proposed this dyestuff penetration method of testing except that relevant apparatus.Because the people is in carrying out this test process, fatigue can cause frequent latent fault, therefore, people have proposed the automatic checkout system by Flame Image Process, for example, and in German patent application DE19639020.6 or DE 19645377.1, at this full text quoted passage for your guidance, in order to avoid repeat.
German patent DE 39 07 732 has been separated the method that is used to monitor by the equipment of dye penetration assessment surface crack, wherein monitor the characteristic of the intensity of light source and test agent, and under the unsatisfied situation of result, shutdown system and the quality by video camera verification test sample.No matter but supervisory signal only is used for shutdown system, does not provide the content of test agent or readjusting of the intensity of light source, also the data file relevant with system action.Therefore, this known system is merely able to carry out the action of shutdown system.German patent application DE 19645377.1 discloses the enforcement to check and proof system reliability and testability.
German patent application 19645377.1 has proposed the variation of the setting of automatic gauging image recorder, for example, the change of focal length, the perhaps change of the recording unit geometric layout relevant with specimen, these changes are easy to change, and similarly, many parameters have appreciable impact to test, for example, the characteristic of clean-out system, test fluid, mordant and temperature.
With regard to known method, method of testing and restriction thereof, test error and control thereof, performance limit, tolerance information or the like, these all are that today is needed, all obtained monitoring, and the duplicating of result's record and/or establishment and result, that is to say that the detection of the feature content of detection system itself also is guaranteed.If in test macro, especially in Auto-Test System, in long relatively operation time period, exist and somely will be categorized as defective workpiece and can obtain the relevant viewpoint of determinacy assessed more reliably with reducing cost or improve, so, this just provides extra guarantee.
The rule that utilization contains the so-called test body of predefine test defect is passed through, can determine whether these test bodies are correctly detected, still, by this method, only might determine that those test bodies do not obtain detecting, and can not determine and why do not obtain detecting.Owing to do not set up any file, what the point of therefore can not display system working no longer satisfactorily can not be illustrated as.
In this case, measurement utilizes bleeding agent to carry out, because the surface tension phenomenon, bleeding agent lures into depression and other surface modification place, for example, and defective, space, pore, depression etc.Simultaneously, the variation of supposing bleeding agent in whole period is, for example, owing to mix with some compositions (for example, remaining grease thing, pollutant etc.) of workpiece in whole period that the result that concentrated change produced due to the solvent evaporation of bleeding agent causes, therefore, up to the present, measurement is to utilize bleeding agent/developer solution to carry out in short relatively time interval after workpiece is handled, after this, defective shows and to change, and this is called as defective " bloom " (" blooming ").This means the bleeding agent dyestuff on defective/in high concentration reduced, dyestuff flows out from defective once more, therefore, its contrast becomes worse and worse.Therefore, utilize the defect estimation of dye powder method to stand dynamic change, it has an immense impact on to measurement result.These changes that defective shows in whole period also do not take in by the high self check characteristic of known system.As the dynamic result of defective demonstration, owing to can not accurately keep therefore, usually can making a mistake from using bleeding agent/developer solution to the time interval the graphics processing unit record sample.According to prior art, because the dynamic behaviour that defective shows, because some defectives as a result of " blooming " have been over-evaluated rapidly, other defectives then do not detect, therefore, and the assessment that often makes a mistake.
Therefore, although utilize the reliability and the validity of the crackle test macro of dye penetration to improve,, still exist the penetrating fluid different problem along with the difference of workpiece to a great extent that concentrates.Simultaneously, the surface condition of workpiece also is different with the surface tension that sepage liquid forms in the above from a kind of material to another kind of material, defective shows blooms and depends on the type of defective and take place, that is to say, according to the degree of depth of defective, the poriness and the smoothness of the surface of material, blooming that defective shows takes place with different speed.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of penetration testing that utilizes and detect improving one's methods of defective.
According to the present invention, the objective of the invention is to realize by the method for generation that contains the following step.
Utilize bleeding agent handle after at least two times (t1, t2) go up to same workpiece write down (A1, A2);
Relatively at different time (t1, t2) go up the record (A1 that produces, A2), obtain the difference value between intensity of when very first time t1, measuring and the intensity of when the second time t2, measuring by video camera by video camera also by the evaluate logic unit evaluation comparative result in the light image processing unit;
Export the signal of described difference value by the evaluate logic unit, these signal indications with the record (A1, A2) in the corresponding zone bleeding agent concentration at (Δ t1 of the whole time interval, Δ t2) variation on, described variation and (Δ t1 of the identical time interval, Δ t2) reference value is compared, on predetermined threshold value; With
The signal exported behind the relevant parameter of the workpiece performance variable with test macro relevant has been considered in one assessment, to generate the assessment variable that forms relevant comprising/bad information with crackle, perhaps, by in the predetermined surface zone, carrying out the defect size assessment at interval with preliminary dimension.
Other useful improvement can obtain according to dependent claims.
Owing to can obtain and estimate the dynamic behaviour of the dyestuff that concentrates on surperficial discontinuous place now reliably, therefore, might carry out new evaluation to surface imperfection fully.Utilizing image processing method to obtain in enterprising line item of several time intervals and the difference of calculating contrast that time behavior that defective shows makes might be by in the difference of this side's automatic Evaluation of data handling system between the record of being done on the different time, defective is classified, defective is estimated, export the demonstration of specific type of defects then.
Mainly compared with the past by the assessment that the people carries out, because video camera does not have any fatigue phenomenon, therefore, the method according to this invention has the advantage that can avoid artificial defect, and this artificial defect is inevitable in the process of similar image being carried out long-time relatively research.
Beyond thought is according to the present invention, might be presented at whole temporal dynamic behaviour by defective now defective is classified.The fact that can measure and store initial value in a kind of like this system means can be for very the sample and the test fluid scope of wide region are provided with system.As assessing the defective result displayed by recording unit, the performance variable file associated test report that now also might write out and be monitored.
Automatically interrelate by utilizing image recorder the selection and the assessment of window and scanning window, crack defect to be set and to show, and the data of obtaining from described image output are handled by computing machine and are realized that evaluate image output is favourable with cycle tests (cycling time).
Simultaneously, can prepare to generate record on the preset time interval unchangeably for recording unit.Go up the single record cell that generates at least two records at interval by being provided at regular time, the whole dimension of crackle test macro and cost thereof can remain on the reduced levels, in addition, can also prevent to use many individual caused problems of record cell of not carrying out identical operation.
But, also workpiece can be directed to and past at least two recording unit K1 by transfer equipment, K2, ..., the Kn place is located to test in the identical physical positioning, so that generate by each recording unit K1, K2, ..., Kn is in the constant physical positioning but utilizing the record A1 that on the different time of bleeding agent after handling workpiece is done, A2, ..., An, and will be from the record A1 of each recording unit by the evaluate logic unit, A2, ..., An compares mutually, then, according to elapsed time between the record at interval, form signal from the difference between the record, these signals are important for type or its dynamic behaviour of defective.Using forwarder and many recording units to have makes mass part very promptly obtain the advantage of testing.With reference data Δ A1, Δ A2 and and record between the mistiming Δ tn in each time interval of process, the data storage that Δ tn+1 is relevant is easily in the storer of evaluate logic unit, and the evaluate logic unit is compared to check that measured difference is whether within the reference range of regulation.This makes and might only be chosen in the defective that shows in the specified time interval.
If the Fixed Time Interval between twice measurement is not set, so, this can be by determining twice record (An at image recorder, An+1) (the Δ tn of the mistiming between, Δ tn+1) and in the contrast measure of the change in future use this mistiming, obtain the time interval that is used to measure.For example, if can not make various piece, do being necessary so in the given time by recording unit.
Under any circumstance, recommendable be allow each building block of system come under observation at interval at the fixed time the unit supervision and allow supervisory signal output, the measured value processing unit is checked this supervisory signal, and therefore exports this supervisory signal.In this case, the geometric layout of at least one image recorder, focal length and function; And/or the quality of the following liquid that uses in the method: test fluid and/or developer solution and/or pickle and/or cleaning device and or the groove data, for example, the groove temperature, liquid level and pollutant are all checked by surveillance equipment.These supervisory signals can be used to control the unit of readjusting of this system and/or it.
By means of by the quality of the method according to this invention check system and the effect that degree of accuracy produced of quality control, in general, be necessary on medium with supervisory signal and/or from the signal record of measured value processing unit, also be inevitable.For this purpose, usually also be necessary directly to measure the parameter relevant with workpiece, for example, component identification number and part number if necessary, are noted them.Supervisory signal is used to readjust the placement of the equipment of the content of the concentration of the concentration of the transducer sensitivity of intensity of illumination and/or illumination monitoring sensor and/or test agent and content and/or clean-out system and content and mordant and/or image recorder, for example, the geometric layout of focal length or sensitivity.
Can allow the test pieces that has reference defect pass through automatically as " integrated testability " (" integral test "), and can check the quality of total system by measuring them to system.
Obviously, the creative method according to the present invention, by at quality inspection illumination system and surveillance, the operation of system can obtain check and remain on the same level.By automatically guaranteeing the function of check system and its composition on the interval at the fixed time, can provide following advantage:
At first, might automatically carry out the differentiation between the defective on the sample now, therefore improve the degree of accuracy and the ability of this method considerably.In addition, also might comprise that the documentation of system is tested in whole operation behavior to system on the time.
Description of drawings
With reference to the accompanying drawings, explain the preferred embodiments of the present invention in detail, the invention is not restricted to this embodiment, but any other embodiment knows those skilled in the art.
Fig. 1 has shown the calcspar of dyestuff penetration method of testing;
Fig. 2 has shown the synoptic diagram according to the crackle test macro of first embodiment of the invention;
Fig. 3 has shown in accordance with another embodiment of the present invention, has contained the synoptic diagram of the crackle test macro of several recording units.
Embodiment
As can be seen from Figure 1, utilizing the splitting in the method for testing of dye penetration, at first in most cases being that the sample to be tested of non-iron carries out prerinse, words are if necessary carried out pickling, make its exsiccation then, and utilize test agent, be also referred to as dye penetrant and handle.Dispose afterwards unnecessary dye penetrant at the appointed time at interval, workpiece is carried out the centre clean, yet utilize developer solution solution to handle.After certain development time, words if necessary become dry workpiece, and in the different time it are checked, then, according to the different recording on the different time, state the defective of relevant workpiece, if desirable words also can be compiled into file with it.
As can be seen from Figure 2, the workpiece 10 that developed is used as sample and introduces test board, wherein schematically shown dye penetrant (promptly from storage container, the dye penetrant cylinder) 12 flow out by spray nozzle and are sprayed onto application process on the workpiece, in fact, sample by other platform, utilizes cleaning and Acidwash solution, developer solution solution and dye solution to handle there, but these platforms is not shown here earlier.Suppose that what directly conduit is guided to sprinkler head is test agent check and dosage measuring system (metered redosing system) 17 again, preferably a kind of according to that of German patent application DE-A-44 38510.2.
, test agent is tested at operability herein, and, if necessary, can with dyestuff or similarly thing measure in accordance with regulations and be input in the storage container (that is dye penetrant cylinder) 12.Utilize under the situation that fluorescent dye operates at present embodiment, sample is by 11 irradiations of UV light source, and UV light source 11 itself can monitor in known manner that therefore its electric current can be readjusted.
From the storage container 12 that is connected with ebullator (passing through spray means) at simple embodiment, be used for the test fluid of labeled surface defective, present by feed conduit, and be sprayed on the whole surface of workpiece 10 by the sprinkler head 13 of sprinkling system.Test fluid is distributed on the whole work-piece, and the dyestuff particulate concentrates on the crackle by well-known physical phenomenon-surface tension effects.Therefore, particle concentration constantly increases on these positions.Unnecessary test fluid can be removed, and for example, eliminates by the method for wiping.Then, utilize developer solution that sample is handled.Through after the development time, decide by experiment for every kind of test layouts and this development time of sample, with the surface of light source 11 irradiation workpiece 10.The result is, particulate in the test fluid is fluoresced or absorb, and the stationary particles that concentrates on gradually in the zone of surface crack noted by video camera 16, and this recording storage is in image processing system 22.After the time interval of second, carry out the record second time at about 20-150, similarly, this recording storage is in image processing system 22.Now, this twice record compared mutually, and be the comparable value distribution time interval by the evaluate logic unit in the graphics processing unit.If desirable words can also further write down At All Other Times and handle.Then, in the evaluate logic unit, utilize the stored reference value table that the comparable value of calculating is compared, so just determined that the image modification value is to be positioned within the preset range, still on predetermined threshold.Correspondingly, can show, and can classify or give up to fall measured parts it by evaluate logic unit output defective.Best, what interrelate with the operability of system is the self-checking equipment that is used to monitor or monitor certainly relevant operational parameter, that is to say, each performance variable is remained within the setting interval.If test value is outside required measured value range, so, such self-checking system can be readjusted in specialized range, the result is, can avoid such as because the too early replacement of marking agent or owing to resemble the too early customary unnecessary waste of material that is caused of replacing of the illumination apparatus the UV light source.This is the service life of prolonged test system significantly, also can not have interruptedly the operation longer time, therefore, similarly can reduce relevant running cost, and about the cost of the material and the energy.This self-checking equipment 14 preferably is connected with documentation equipment 30, can generate test report in documentation equipment 30, utilizes the operability that this test report can verification system.
Another embodiment that is used for implementing the system of the method according to this invention is presented at Fig. 3.In this case, some measurement units 16,16 ', 16 " can export their record, these records are fed to each input end of graphics processing unit 22.In this case, each workpiece 10 is carried out twice record at least at different time, and pass through, for example, subtract each other and determine the poor of two records.These differences can be fed to, and for example, visual display unit 20 perhaps is connected the sorting device in downstream, and this sorting device automatically will be categorized into poor isolation of components and come out.
Login based on the data stream of brightness value do not realize by video camera, but also can advantageously utilize diode or realize such as other appropriate device that those skilled in the art are familiar with.Certainly, also can come long-range foundation and storage file by remote data communication by equipment.
Now, at first the fact that the dynamic behaviour on surface of the work is assessed to test agent makes and can classify to defective unexpectedly, like this can be more accurately to giving up parts and useful parts are distinguished, if possible, parts are divided into grade by quality, for example, be divided into A and B grade.
Although describe the present invention by the preferred embodiments of the present invention; but it is apparent to those skilled in the art that its various modification of doing all within the protection domain of claims, therefore; in any case the present invention can not be limited by the examples.
Claims (15)
1. automatic flaw detection method of utilizing dye penetration to carry out crack detection, the workpiece that wherein is used for dye test is to utilize the bleeding agent that contains dyestuff to handle, and dyestuff is concentrated on the surface imperfection, the process predetermined visualization is after the time, carry out record by at least one image recorder, the zone of concentrating by scanning and detection dyestuff is assessed described record in graphics processing unit then, defective that output at last is just detected and corresponding signal, described method comprises the following steps:
Utilizing bleeding agent at least two time t1, t2, same workpiece to be carried out record after handling, to obtain document image A1, A2;
Compare the document image A1, the A2 that on different time t1, t2, produce, and, obtain the difference value between intensity of when very first time t1, measuring and the intensity of when the second time t2, measuring by video camera by video camera by the evaluate logic unit evaluation comparative result in the light image processing unit;
Export the signal of described difference value by the evaluate logic unit, these signal indications with the corresponding zone of document image A1, A2 in the variation of bleeding agent concentration on whole time interval t2-t1, described variation is compared with the reference value of identical time interval t2-t1, on predetermined threshold value; With
The signal exported behind the relevant parameter of the workpiece performance variable with test macro relevant has been considered in assessment, to generate the assessment variable that forms relevant comprising/bad information with crackle, perhaps, in the predetermined surface zone, carry out the defect size assessment at interval with preliminary dimension.
2. the method for claim 1, wherein, assessing signal output is by will utilizing selection that image recorder is provided with window and scanning window, crack defect with assessment and show and automatically interrelate with cycle tests, and the data of obtaining from described image is exported are handled by computing machine and realized.
3. method as claimed in claim 1 or 2, wherein, described image recorder generates record on constant preset time interval.
4. method as claimed in claim 1 or 2, wherein,
Pass through transfer equipment, with workpiece be directed to in the past at least two recording unit K1, K2 ..., in the identical physical positioning in Kn place place so that generate by each image recorder K1, K2 ..., Kn in the constant physical positioning but utilizing the record A1, the A2 that on the different time of bleeding agent after handling workpiece are done ..., An; With
By the evaluate logic unit will from each recording unit K1, K2 ..., Kn record A1, A2 ..., An compares mutually, and at interval according to elapsed time between the record, from record A1, A2 ..., the difference between the An forms signal.
5. the method for claim 1, wherein be used for image modification A2-A1 reference data and with the record A1, A2 ..., between the An the mistiming t in each time interval of process
N+1-t
nRelevant data storage is in the storer of evaluate logic unit, and the evaluate logic unit makes comparisons checking measured difference whether in the threshold range of regulation, thus at the fixed time at interval in output only represent the signal of defective.
6. method as claimed in claim 2, wherein, if there is not the cycling time of fixing test sequence, so, by determining the mistiming t between twice record An, An+1 of image recorder
N+1-t
nAnd in the contrast measure of the change in future, use this mistiming, obtain the time interval that is used to measure.
7. the method for claim 1, wherein gone up each building block and the parameter of surveillance at the fixed time at interval and exported supervisory signal by monitor unit, the measured value processing unit is checked these supervisory signals, and therefore exports these supervisory signals.
8. method as claimed in claim 7, wherein system's each building block that will monitor and the parameter geometric layout, focal length and the function that are at least one image recorder; Quality with the function of light irradiation apparatus and/or the liquid that in described method, uses.
9. method as claimed in claim 8, wherein, test fluid, developer solution and pickle are applied in the described method.
10. method as claimed in claim 8, wherein, the groove data that monitored are temperature, liquid level and pollutants of each groove.
11. method as claimed in claim 7, wherein, supervisory signal is used for the unit of readjusting of control system and/or it.
12. the method for claim 1, wherein supervisory signal and/or all be recorded on the medium from the signal of measured value processing unit.
13. the method for claim 1, wherein directly measure the parameter relevant, if necessary, they noted with workpiece.
14. method as claimed in claim 7, wherein, supervisory signal is used to readjust the content of the concentration of the concentration of the transducer sensitivity of intensity of illumination and/or illumination monitoring sensor and/or test agent and content and/or clean-out system and content and mordant and/or comprises focal length or the setting of the image recorder of the geometric layout of sensitivity.
15. the method for claim 1, wherein allow the test block that has reference defect pass through automatically, and check the quality of total system by testing them.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19902525A DE19902525C2 (en) | 1999-01-22 | 1999-01-22 | Procedure for the automatic detection of defects in the crack inspection according to the dye penetration procedure |
| DE19902525.8 | 1999-01-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1293758A CN1293758A (en) | 2001-05-02 |
| CN1187603C true CN1187603C (en) | 2005-02-02 |
Family
ID=7895111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB008000581A Expired - Fee Related CN1187603C (en) | 1999-01-22 | 2000-01-21 | Automatic flaw detection method for crack detection by dye penetration method |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1066510A1 (en) |
| KR (1) | KR20010092248A (en) |
| CN (1) | CN1187603C (en) |
| DE (1) | DE19902525C2 (en) |
| WO (1) | WO2000043758A1 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10150566B4 (en) * | 2001-10-15 | 2004-08-12 | Mr-Chemie Gmbh | Methods for testing plastics |
| DE10353042B4 (en) * | 2003-11-13 | 2006-05-18 | Siemens Ag | Method for verifying hairline cracks in a solder joint that connects a component to a printed circuit board |
| DE10357924B3 (en) * | 2003-12-11 | 2005-07-21 | Daimlerchrysler Ag | Testing for crack formation in diverse types of mold by passing hot fluid through cooling channels and observing any leakage using heat detecting monitor |
| DE102007024059B4 (en) | 2007-05-22 | 2017-11-09 | Illinois Tool Works Inc. | Apparatus and method for evaluating a control body in a color penetration method |
| DE102007032439A1 (en) * | 2007-07-10 | 2009-01-22 | Volker Dr.-Ing. Grießbach | Method for determining properties of three-dimensional objects |
| DE102012200767B4 (en) * | 2012-01-19 | 2014-11-13 | MTU Aero Engines AG | Non-destructive testing of workpiece surfaces |
| CN102914548A (en) * | 2012-08-27 | 2013-02-06 | 沈阳黎明航空发动机(集团)有限责任公司 | Linear display fault improvement method for nondestructive inspection of ribbed plate of shell |
| DE102013110742B4 (en) * | 2013-09-27 | 2019-06-27 | Cavonic GmbH | Test method and tester for barrier layer |
| CN104237255A (en) * | 2014-09-22 | 2014-12-24 | 合肥鑫晟光电科技有限公司 | Detection method of glass substrate |
| CN104475352A (en) * | 2014-12-12 | 2015-04-01 | 湖南省新化县长江电子有限责任公司 | Method for sorting unqualified ceramic products after sintering |
| CN105021524A (en) * | 2015-08-04 | 2015-11-04 | 大族激光科技产业集团股份有限公司 | Crack detecting method for surface of granite basic part of machine tool |
| CN106556494A (en) * | 2015-09-30 | 2017-04-05 | 鸿富锦精密工业(武汉)有限公司 | Water-leakage detecting system and leakage detection method |
| CN107918691B (en) * | 2016-10-07 | 2023-09-29 | 福特全球技术公司 | Method and device for evaluating a signal |
| DE102019130701B3 (en) * | 2019-11-14 | 2021-04-01 | Lufthansa Technik Aktiengesellschaft | Process for the visualization of damaged areas of the surface microstructure of a microstructured surface |
| CN112378925A (en) * | 2020-09-24 | 2021-02-19 | 宁波市鄞州世纪耀达市政建设有限公司 | CCTV-based pipeline detection method |
| CN112881424A (en) * | 2021-01-13 | 2021-06-01 | 广东省特种设备检测研究院珠海检测院 | AI + fluorescence permeation small-sized pipe surface defect detection and quality grading method and system |
| CN115950892B (en) * | 2023-03-14 | 2023-05-26 | 江阴市华昌不锈钢管有限公司 | Automatic spraying detection device for identifying microcracks on outer surface of stainless steel pipe based on image |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3762216A (en) * | 1971-02-23 | 1973-10-02 | E Mendoza | Automated liquid penetrant inspection system |
| DE3440473A1 (en) * | 1984-11-06 | 1986-05-07 | Karl Deutsch Prüf- und Meßgerätebau GmbH + Co KG, 5600 Wuppertal | Method and device for determining fractures on the surface of workpieces |
| DE3731947A1 (en) * | 1987-09-23 | 1989-04-13 | Kurt Dr Sauerwein | METHOD AND DEVICE FOR DETECTING AND EVALUATING SURFACE CRACKS IN WORKPIECES |
| DE3907732A1 (en) * | 1989-03-10 | 1990-09-13 | Isotopenforschung Dr Sauerwein | METHOD FOR MONITORING A DEVICE FOR AUTOMATICALLY DETECTING AND EVALUATING SURFACE CRACKS |
| DE9416218U1 (en) * | 1994-10-09 | 1995-02-16 | Tiede GmbH + Co Rissprüfanlagen, 73457 Essingen | Crack test system with self-check |
| DE19527446A1 (en) * | 1995-04-28 | 1996-10-31 | Karl Deutsch Pruef Und Mesgera | Method for optical surface inspection of workpieces |
| DE19639020A1 (en) * | 1996-09-23 | 1998-04-02 | Tiede Gmbh & Co Risspruefanlagen | Crack test system with self-check |
| DE19645377C2 (en) * | 1996-11-04 | 1998-11-12 | Tiede Gmbh & Co Risspruefanlagen | Crack testing system for workpieces using the dye penetration method and method for automatic crack detection |
-
1999
- 1999-01-22 DE DE19902525A patent/DE19902525C2/en not_active Expired - Fee Related
-
2000
- 2000-01-21 WO PCT/DE2000/000183 patent/WO2000043758A1/en not_active Application Discontinuation
- 2000-01-21 CN CNB008000581A patent/CN1187603C/en not_active Expired - Fee Related
- 2000-01-21 KR KR1020007010460A patent/KR20010092248A/en not_active Application Discontinuation
- 2000-01-21 EP EP00906158A patent/EP1066510A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE19902525C2 (en) | 2001-03-22 |
| DE19902525A1 (en) | 2000-08-17 |
| EP1066510A1 (en) | 2001-01-10 |
| WO2000043758A1 (en) | 2000-07-27 |
| CN1293758A (en) | 2001-05-02 |
| KR20010092248A (en) | 2001-10-24 |
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