CN1605860A - Radiographic inspection compensation method - Google Patents
Radiographic inspection compensation method Download PDFInfo
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- CN1605860A CN1605860A CN 200410087558 CN200410087558A CN1605860A CN 1605860 A CN1605860 A CN 1605860A CN 200410087558 CN200410087558 CN 200410087558 CN 200410087558 A CN200410087558 A CN 200410087558A CN 1605860 A CN1605860 A CN 1605860A
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Abstract
The radiography inspection compensating method includes detecting the blackness values of different films via comparison, and drawing the characteristic curve with the characteristic curve data of different films to select films suitable for radiography inspection; verifying the reasonability and reliability of effective transillumination area selection via detecting the light beam homogeneity in X-ray machine; and final selecting filling and compensating powder with density, ray adsorption and attenuation same or near to the detected material, and filling powder of 0.1-0.3 mm size densely before the part transillumination. The present invention is reasonable and effective radiography inspection process suitable for use in industrial production environment.
Description
Technical field
The present invention relates to a kind of part of appliance Non-Destructive Testing, be specifically related to a kind of radiographic inspection compensation method.
Background technology
As everyone knows, in the commercial production strictness detection being carried out in processing or amended equipment component quality, has been the program that must carry out, and the method for its check is more various.But some are had the detection that high performance requirements, structure are complicated again, have the part of appliance of inner chamber, then require to have stricter quality testing.For example, high-pressure turbine blade is the vital part of aero gas turbine engine, and there is the complicated cavity of guaranteeing that blade cools and intensity needs in blade interior, and at the numerous small exhausr port of blade surface preparation.The variation of blade inner chamber has reflected the size of blade cooling degree, has reflected that the blade working temperature exceeds the degree that the blade metal material allows serviceability temperature, and the final decision blade is so that the usefulness of turbine.The high-pressure turbine blade internal soundness will directly influence the security of operation of engine, and the reliability requirement of its use also will be trusted to a great extent in the Dynamic Non-Destruction Measurement that adopts except that the precision casting technology of using high temperature casting alloy and advanced person.
At present, domestic internal soundness detection to gas turbine engine blade is by measuring the current value in hole, crack, finding the unusual of inner chamber, but can not affirm fully and cause owing to the inner chamber foreign matter.That is to say the situation that can not reflect the inner chamber cleanliness intuitively, exactly.Prior art adopts Computerized chromatographic (CT) detection technique morely in the world.Though this detection method is the testing product quality preferably, this method device therefor expense height, the processing time is quite long, and production efficiency is low, the production cost height; To detecting on-the-spot environmental requirement, be not suitable for the relatively poor commercial production scene of condition than higher.
Summary of the invention
The objective of the invention is the problem at the prior art existence, seek a kind of new detection approach---radiographic inspection compensation method, its technology is simple, the production efficiency height, and cost is low, can be applicable to the general industrial production environment.
The technical scheme that realizes the object of the invention is: the film of selecting to be fit to radiographic examination (complete), determine radiographic X effective transillumination district then, the selection and the padding of compensation powder, main points are blackness value and specificity analysises that the utilization comparative approach is measured different films, select to be fit to the film of radiographic examination (complete); By X-ray production apparatus is measured rationality and the reliability that beam uniformity verifies that effective transillumination district is selected; The density of the compensation powder of filling is selected identically with detected density of material or close before the parts transillumination, close to absorption, the decay of ray, the filling powder size is elected 0.1～0.3mm as, and powder filling is closely knit, does not interspace.
For guaranteeing the image quality of radiographic examination (complete), at first adopt comparative measurement to carry out the analysis of film characteristic and select for use, concrete grammar is that X-ray film is wrapped black paper, its loam cake stereotype, have exposure hole on the stereotype, during exposure stereotype is moved, X ray makes film segmentation exposure by aperture, obtains the photographic density under the different exposures.Each exposure station blackness is surveyed three times, got the family curve test data that its mean value draws different films, make the performance diagram of different films, select the film that is fit to radiographic examination (complete) at last with these data.
X-ray production apparatus is determined effective transillumination district by the method for measuring beam uniformity.Its beam uniformity test is: place 5 identical metal testing plates on a plumbous platform of circle, wherein 4 are placed on the circumference circle, mutually at an angle of 90, one is placed on the center of circle, transillumination is carried out in 5 test pieces simultaneously, the blackness value that guarantees to obtain on every egative film in 2.5～3.5 scope, the blackness value on every egative film can not overcenter photographic density value ± 0.3, promptly to satisfy the following formula condition:
D
0-0.30D
0≤D≤D
0+0.30D
0
Wherein: D
0It is the blackness of central ray bundle indication place's test piece ray
D is each metal testing plate radiographic film blackness
The present invention compared with the prior art, its outstanding feature and effect are:
1, the utilization radiographic inspection compensation method detects the internal soundness of aero gas turbine engine part, than Computerized chromatographic (CT) detection technique that prior art adopted, its technology is simple, easy to operate, the time is short, the efficient height, production cost is lower relatively, cost of equipment is low, and the time is short, more can be applicable to various industrial production environments.
2, radiographic inspection compensation method of the present invention has and can accurately reflect casting grid inner chamber foreign matter, guarantees the image quality and the sensitivity of radiographic examination (complete).Owing to choose the density of compensation powder and the density basically identical of blade material in this method, thereby much at one to the coefficient of ray, decay, the non-metallic inclusion that is lower than density of material that exists in the cavity is when radiographic examination (complete) so, will inevitably bring tangible contrast, on egative film, form the video bigger than other position blackness, the filling that promptly compensates powder has improved the homogeneity of blade inner chamber radiographic film video blackness, makes the foreign matter video more clear, is easy to differentiate.Filling powder film scanning video and accompanying drawing 4 filling powder film scanning aspect ratios are not very tangible to its effect from accompanying drawing 3.
Description of drawings
Fig. 1 measures the synoptic diagram of film density value for the present invention adopts comparative measurement;
Among the figure 1, X ray, 2, exposure mouthful, 3, plumbous multitudinous plate, 4, film, 5, stereotype, I
0Represent the incident transmitted intensity, I represents transmitted ray intensity
Fig. 2 is the characteristic curve of film of the present invention;
Fig. 3 is a not filling powder film scanning video of the aero engine turbine blades chosen among the embodiment;
Fig. 4 is the aero engine turbine blades filling powder film scanning video of choosing among the embodiment.
Embodiment
Choosing aero engine turbine blades, is a casting grid type cavity structure, and purpose is to check its inner chamber cleanliness, stops up gas channel to have prevented foreign matter, guarantees the cooling effect of blade.At first adopt comparative measurement to carry out the analysis of film characteristic and select for use; Get the X-ray film of long * wide (11 inches * 1.5 inches) and wrap black paper, its loam cake stereotype, thickness must be enough to make film not influenced by X ray.Have the hole that diameter is 15mm on the stereotype, during exposure stereotype is progressively moved, X ray makes film segmentation exposure by aperture, as shown in Figure 1.In this example, select SEIFERT ISOVOT320/13 type stationary X-ray equipment for use, basic transmitting illumination parameter is tube voltage 95KV, tube current 3mA, focal length 1800mm, each time shutter is 8,16,32,94,128,256,512 seconds, and logH lgE is respectively 1.38,1.68,1.98,2.28,2.59,2.89,3.19.Select six kinds of different films for use,, obtain the photographic density under the different exposures by transillumination.Each exposure station blackness is surveyed three times, got the family curve test data that its mean value just draws six kinds of different films, make the family curve of different films.Characteristic curve of film test data sees Table 1, and family curve is seen Fig. 2.The test result that obtains six kinds of different film key properties from performance diagram sees Table 2.From the characteristic curve of film as can be seen, the light sensitivity of various model films and average Grad have tangible difference, have only low speed, and the particulate type high sensitivity radiographic examination (complete) film of high average gradient could satisfy the application conditions of radioscopy compensation method.
Table 1 characteristic curve of film test data
| The exposure station sequence number | LogH lgE | Six kinds of different photographic density D test values | |||||
| ????GYL-III | It N-III | Tianjin V | ????KX221 | ????GX-47 | Russia PT-5 | ||
| ??1 | ???1.38 | ????0.50 | ????0.45 | ????0.30 | ????0.33 | ????0.31 | ????0.27 |
| ??2 | ???1.68 | ????0.56 | ????0.50 | ????0.32 | ????0.40 | ????0.40 | ????0.28 |
| ??3 | ???1.98 | ????0.89 | ????0.67 | ????0.34 | ????0.66 | ????0.58 | ????0.32 |
| ??4 | ???2.28 | ????1.42 | ????1.03 | ????0.46 | ????1.17 | ????0.91 | ????0.39 |
| ??5 | ???2.58 | ????2.26 | ????1.69 | ????0.72 | ????1.98 | ????1.58 | ????0.57 |
| ??6 | ???2.89 | ????3.25 | ????2.83 | ????1.17 | ????3.13 | ????2.65 | ????0.92 |
| ??7 | ???3.19 | ????4.31 | ????4.46 | ????2.02 | ????4.57 | ????4.18 | ????1.55 |
Table 2 film characteristic test result
| The film model | LgE value during D=1.0 | Light sensitivity S 0 | Inclination angle [theta] | Average gradient G |
| Tianjin GYL-III | 2.05 | ????8.913 | ????69.39° | ????2.654 |
| Tianjin N-III | 2.26 | ????5.495 | ????71.34° | ????2.955 |
| Tianjin V | 2.79 | ????1.622 | ????73.43° | ????3.353 |
| Lekai KX221 | 2.20 | ????6.310 | ????71.39° | ????2.964 |
| Shanghai GX-A7 | 2.34 | ????4.571 | ????72.26° | ????3.119 |
| Russia PT-5 | 2.94 | ????1.148 | ????72.88° | ????3.239 |
To the microradiography X film selected after, determine effective transillumination district of X-ray production apparatus, and can verify rationality and the reliability that effective transillumination district is selected by the method for measuring beam uniformity.Radiographic examination (complete) equipment is ISOVOLT320/13 type X-ray production apparatus, and its illumination angle theta equals 20 °; The maximum focal length of Fmax device therefor is 1360mm; After being placed in diameter and being the plumbous platform of 720mm, this lead platform is used to carry high-pressure turbine blade L1 and has only 1100mm, can calculate its effective transillumination district L according to formula, i.e. L=2L1tg θ=2 (1100tg20 °)=801mm.This shows that whole plumbous platform all is in effective transillumination district,, adopt beam uniformity to verify for rationality and the reliability of verifying that effective transillumination district is selected.Experimental procedure is: place the metal testing plate of 5 identical (about thickness 6.5mm) on the plumbous platform of circle, wherein 4 are placed on circumference, allow them mutually at an angle of 90; 1 is placed on the center of circle.According to the energy of used X-ray production apparatus, selected focal length and exposure transillumination is carried out in 5 test pieces simultaneously, the blackness value that should guarantee to obtain on every egative film is all in 2.5～3.5 scope; Measure the photographic density value of 5 test pieces then, the blackness value on every egative film can not surpass the center sheet blackness value ± 0.3, promptly to satisfy following formula condition: D
0-0.30D
0≤ D≤D
0+ 0.30D
0Wherein: D
0It is the blackness value of central ray bundle indication place's test piece ray.The blackness test value of 5 test pieces sees Table 3.As can be seen from the table, the radiographic film blackness of 5 test pieces all satisfies the formula requirement, and whole plumbous platform is in effective transillumination district, can guarantee the blackness of engine high pressure turbo blade inner chamber cleanliness radiographic examination (complete).
Table 3 beam uniformity test photographic density test value
| Sequence number | Test piece radiographic film blackness test value | Average blackness | |||||
| ????1 # | ????3.31 | ????3.22 | ????3.23 | ????3.08 | ????3.16 | ????3.05 | ????3.175 |
| ????2 # | ????3.00 | ????3.01 | ????3.05 | ????3.03 | ????3.02 | ????2.94 | ????3.008 |
| ????3 # | ????2.95 | ????3.04 | ????3.07 | ????3.02 | ????3.04 | ????2.97 | ????3.015 |
| ????4 # | ????3.03 | ????3.05 | ????3.12 | ????2.87 | ????3.06 | ????2.90 | ????3.005 |
| ????5 # | ????3.29 | ????3.28 | ????3.44 | ????3.28 | ????3.26 | ????3.30 | ????3.30 |
At last the compensation powder is analyzed and is selected for use: to aero engine turbine blades by energy spectrum analysis, choose the powder З П 741H П alloy powder close with the turbo blade chemical constitution, powder size is selected in 0.1～0.3mm scope, and particle size range is not less than 50% of full powder at the powder of 0.18～0.3mm.Selected powder is filled in detected turbo blade inner chamber, and filling is closely knit, not drain voids.Adopt the mode of not filling powder and filling powder to carry out transillumination respectively, the radiographic film comparative test result is seen Fig. 3, Fig. 4.
Claims (4)
1, a kind of radiographic inspection compensation method, at first select to be fit to the film of radiographic examination (complete), determine the selection and the padding of radiographic X effective transillumination district and compensation powder then, it is characterized in that the blackness value that uses comparative approach to measure different films and carry out specificity analysis, select to be fit to the film of radiographic examination (complete); By X-ray production apparatus is measured rationality and the reliability that beam uniformity verifies that effective transillumination district is selected; Before the parts transillumination, the density of the compensation powder of selection filling is identical with detected density of material or close at last, and also close to absorption, the decay of ray simultaneously, the filling powder size is elected 0.1～0.3mm as, and powder filling is closely knit, does not interspace.
2, according to the described a kind of radiographic inspection compensation method of claim 1, it is characterized in that using comparative approach to select to be fit to the film of radiographic examination (complete), be that X-ray film is wrapped black paper, its loam cake stereotype, have exposure hole on the stereotype, during exposure stereotype is moved, X ray makes film segmentation exposure by aperture, obtains the photographic density under the different exposures; Each exposure station blackness is surveyed three times, is got its mean value, different characteristic curve of film test datas, make the performance diagram of different films with these data, select the film that is fit to radiographic examination (complete).
3, according to the described a kind of radiographic inspection compensation method of claim 2, the exposure hole diameter that it is characterized in that on the stereotype being opened is 15mm.
4, according to the described a kind of radiographic inspection compensation method of claim 1, it is characterized in that described by X-ray production apparatus mensuration beam uniformity is verified effective transillumination district, its step is to place 5 identical metal testing plates on a plumbous platform of circle, wherein 4 are placed on circumference, mutually at an angle of 90, one is placed on the center of circle, and transillumination is carried out in 5 test pieces simultaneously, make the blackness value that obtains on every egative film in 2.5～3.5 scope, the blackness value on every egative film satisfies the following formula condition:
D
0-0.30D
0≤D≤D
0+0.30D
0
Wherein: D
0It is the blackness of central ray bundle indication place's test piece radiographic film
D is each metal testing plate radiographic film blackness.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100875584A CN100545642C (en) | 2004-11-17 | 2004-11-17 | A kind of radiographic inspection compensation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100875584A CN100545642C (en) | 2004-11-17 | 2004-11-17 | A kind of radiographic inspection compensation method |
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| Publication Number | Publication Date |
|---|---|
| CN1605860A true CN1605860A (en) | 2005-04-13 |
| CN100545642C CN100545642C (en) | 2009-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100875584A Expired - Fee Related CN100545642C (en) | 2004-11-17 | 2004-11-17 | A kind of radiographic inspection compensation method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156140A (en) * | 2011-03-21 | 2011-08-17 | 武汉钢铁(集团)公司 | Radiographic inspection compensating daub for materials with unequal thicknesses and preparation method thereof |
| CN102788808A (en) * | 2011-05-19 | 2012-11-21 | 国核电站运行服务技术有限公司 | Test method of standard film characteristic curve |
| CN104122275A (en) * | 2014-06-30 | 2014-10-29 | 中国化学工程第十四建设有限公司 | Radiographic method for 9% Ni steel |
| CN104698013A (en) * | 2013-12-05 | 2015-06-10 | 珠海格力电器股份有限公司 | Integral flaw detection method for aluminum alloy impeller |
| CN109613027A (en) * | 2018-11-29 | 2019-04-12 | 中国航发沈阳黎明航空发动机有限责任公司 | To the process unit and method of turbo blade leading edge air film hole X-ray detection |
| CN112683936A (en) * | 2020-11-26 | 2021-04-20 | 中国船舶重工集团公司第十二研究所 | Radiographic inspection method for complex structural part |
-
2004
- 2004-11-17 CN CNB2004100875584A patent/CN100545642C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156140A (en) * | 2011-03-21 | 2011-08-17 | 武汉钢铁(集团)公司 | Radiographic inspection compensating daub for materials with unequal thicknesses and preparation method thereof |
| CN102788808A (en) * | 2011-05-19 | 2012-11-21 | 国核电站运行服务技术有限公司 | Test method of standard film characteristic curve |
| CN104698013A (en) * | 2013-12-05 | 2015-06-10 | 珠海格力电器股份有限公司 | Integral flaw detection method for aluminum alloy impeller |
| CN104122275A (en) * | 2014-06-30 | 2014-10-29 | 中国化学工程第十四建设有限公司 | Radiographic method for 9% Ni steel |
| CN109613027A (en) * | 2018-11-29 | 2019-04-12 | 中国航发沈阳黎明航空发动机有限责任公司 | To the process unit and method of turbo blade leading edge air film hole X-ray detection |
| CN112683936A (en) * | 2020-11-26 | 2021-04-20 | 中国船舶重工集团公司第十二研究所 | Radiographic inspection method for complex structural part |
| CN112683936B (en) * | 2020-11-26 | 2023-11-10 | 中国船舶重工集团公司第十二研究所 | Radiographic inspection method for complex structural member |
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|---|---|
| CN100545642C (en) | 2009-09-30 |
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