CN105004790A - Compressor impeller defect phased array ultrasonic detection method - Google Patents
Compressor impeller defect phased array ultrasonic detection method Download PDFInfo
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- CN105004790A CN105004790A CN201510409139.6A CN201510409139A CN105004790A CN 105004790 A CN105004790 A CN 105004790A CN 201510409139 A CN201510409139 A CN 201510409139A CN 105004790 A CN105004790 A CN 105004790A
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Abstract
The invention relates to a compressor impeller defect phased array ultrasonic detection method. The method comprises 1, connecting a probe and a detected wedge by a coupling agent, putting the connected probe and detected wedge into a through hole in a compressor impeller so that the connected probe and detected wedge tightly cling to a cylindrical inner wall, and coating parts between the detected wedge and the cylindrical inner wall with the coupling agent, 2, setting a focus scanning mode as a detection mode of a phased array ultrasonic detection device, and 3, setting a scanning depth of the phased array ultrasonic detection device as the largest thickness of a compressor impeller wheel disc, stimulating 8 or 16 wafers in each group, carrying out detection, and after one detection process, recording and storing the detection result. The detection method realizes detection of wheel disc and blade root internal defects, prevents a detection blind area caused by a complex structure, reduces a residual error rate and has high defect positioning accuracy.
Description
Technical field
The present invention relates to field of non destructive testing, be specifically related to compressor impeller defect phased array ultrasonic detection technical field.
Background technology
Compressor impeller is the important component part of blower unit, by High Rotation Speed, mechanical energy is converted to energy and kinetic energy in gas under arms in process.Structurally, blade and wheel disc are the important component parts of impeller.
Compressor impeller under arms in process by High Rotation Speed mechanical energy to be converted in gas can and kinetic energy.Due to the Service Environment of impeller complexity, it subjects the alternate loads such as huge centrifugal force, bending stress, vibration stress, easily occurs fatigue crack and erosive wear, directly utilizes naked eyes just can observe for impeller surface macroscopic cracking and erosive wear; But for impeller underbead crack, pore, be mingled with and directly with the naked eye cannot observe, in order to ensure that the integrality on blade wheel structure needs to detect it by the means of Non-Destructive Testing.
In conventional lossless detection method, Liquid penetrant testing is merely able to the microcrack detecting impeller surface, and EDDY CURRENT, Magnetic testing are merely able to detect impeller surface and near surface flaw, and these methods are all helpless for the defect of impeller internal; Although ray detection can detect impeller internal defect, its testing cost is too high, has radiation to human body, in order to control the quality of impeller, increases economic efficiency, and correct detection means must be selected to detect the danger of existence in time.Ultrasound examination because of its have that highly sensitive, penetration capacity is strong, good resolution, detection speed are fast, cost is low, equipment Inspection and the series of advantages such as harmless and be widely used in the detection of inside workpiece defect.
Along with current science and technology develops rapidly, phased array ultrasonic detection has been applied in industrial detection widely, but, the geometric configuration more complicated of impeller, in order to complete the detection of impeller internal defect, placement and the detection mode of the phased array probe of prior art have significant limitation, and this brings very large difficulty just to actual detection.Main difficult point has 1) probe of the phased array ultrasonic detection of prior art can only be placed on sheave surface, and also can a unclear position that is placed on be detected all sidedly to whole impeller; 2) the comparatively large or shape of voussoir of popping one's head in is not mated with impeller surface shape, and probe voussoir cannot be placed in a lot of impeller surface position; 3) phased array ultrasonic detection has multiple scan method, and that scan method is applicable to the detection of impeller, and concrete what parameter that adopts detects, and does not record in prior art.
Summary of the invention
Goal of the invention of the present invention is to provide a kind of phased array ultrasonic detecting method that can detect impeller internal defect, can detect wheel disc and blade root inherent vice, avoid the check frequency caused because of labyrinth, reduce loss, there is very high defect location accuracy rate.
Concrete technical scheme of the present invention is a kind of compressor impeller defect phased array ultrasonic detecting method, it is characterized in that, the other end that the detection voussoir adopted is installing probe positions relative has the cambered surface coordinated with the cylinder shape inner wall of described compressor impeller inner via hole, this detection method specifically comprises the following steps
(1) be connected with described detection voussoir by couplant by probe, probe is placed into compressor impeller inner via hole after being connected with detection voussoir and is adjacent to its cylinder shape inner wall, between detection voussoir and cylinder shape inner wall, scribble couplant;
(2) detecting pattern of phased array ultrasonic detection instrument is set to focusing scanning;
(3) scan depths of phased array ultrasonic detection instrument is set to the maximum gauge of compressor impeller wheel disc, often group excites 8 or 16 wafers, starts to detect, and after one-time detection, records and stores testing result;
(4) detection voussoir is moved to next detection position, repeats step 3), until detect the cylinder shape inner wall of voussoir traversal compressor impeller inner via hole;
(5) scan depths of phased array ultrasonic detection instrument is set to the minor increment of compressor impeller blade root distalmost end to the cylinder shape inner wall of compressor impeller inner via hole, often group excites 16 wafers, start to detect, after one-time detection, record and store testing result;
(6) detection voussoir is moved to next detection position, repeats step 5), until detect the cylinder shape inner wall of voussoir traversal compressor impeller inner via hole;
(7) compressor impeller defect phased array ultrasonic detection is completed.
Further, the cylinder shape inner wall internal diameter of described compressor impeller inner via hole is 68mm, and described described detection voussoir material is organic glass, radius-of-curvature r is 51.8 ~ 68.1mm, and thickness is 20 ~ 25mm, and width is 30 ~ 40mm, be highly 60 ~ 70mm, the velocity of sound is 2237m/s.
Further, in described step (3), the maximum gauge of compressor impeller wheel disc is 15mm, and in described step (5), compressor impeller blade root distalmost end is 20mm to the minor increment of the cylinder shape inner wall of compressor impeller inner via hole.
Further, described couplant is 30# machine oil, and density is 0.9g/cm3, and the velocity of sound is 1400m/s.
Further, described probe is Olympus5L64A2 type probe, and described phased array ultrasonic detection instrument is Multi2000 phased array ultrasonic detection instrument.
The invention has the beneficial effects as follows 1) the surface of internal cavity smoother of impeller, and also inner space is also larger, and the inner chamber choosing impeller detects, and can facilitate and fully realize the detection to wheel disc and blade root inherent vice; 2) employing has the probe voussoir coordinating cambered surface with the inner chamber of impeller, can be coupled completely, can realize the Ultrasonic Detection to whole impeller with impeller inner chamber; 3) mode of focusing scanning is adopted to detect, what focusing scanning acoustic energy beam compared concentrates, and is convenient to the detection of tiny flaw, and when detecting same defect, under focusing scanning, defect reflection signal is stronger than defect reflection signal under linear sweep, is convenient to the identification of flaw indication; 4) according to the physical dimension of impeller, choose detected parameters targetedly, as the different parts such as wheel disc and blade root, choose different scan depths and wafer mode of excitation, detected energy is high, and loss is low.
Accompanying drawing explanation
Fig. 1 is the principle schematic adopting the phased array ultrasonic detecting method of prior art to detect compressor impeller;
Fig. 2 is the schematic diagram that phased array ultrasonic detecting method of the present invention detects compressor impeller;
Fig. 3 shows aobvious result figure for adopting method of the present invention to hub disk Inner Defect Testing B scanning;
Fig. 4 adopts method of the present invention to the defect A sweep display result figure of a certain scanning position of hub disk defects detection;
Fig. 5 scans display result figure for adopting method of the present invention to impeller blade root Inner Defect Testing B;
Fig. 6 adopts method of the present invention to the defect A sweep display result figure of a certain scanning position of impeller blade root defects detection.
Embodiment
Below in conjunction with accompanying drawing, concrete technical scheme of the present invention is further described.
As shown in Figure 1, when probe 4 is placed on the upper surface place of compressor impeller wheel disc 2, can detect wheel disc 2 inherent vice, but 4 need connecting wedge 3 ' in the detection owing to popping one's head in, and the voussoir connecting phased array probe is general larger, and the less plane domain of wheel disc 2 upper surface limits the placement of probe 4.For the defect of blade root 1 inside, utilize probe 4 connect a kind of tapered wedges 3 ' detect time, because whole impeller structurally exists uncontinuity, verify through test of many times, ultrasound wave is difficult to propagate into blade root 1 position, is difficult to detect, exists undetected to the defect of blade root inside.
Therefore, when probe 4 connection detection voussoir 3 is placed on impeller inner chamber, utilize compressional wave can complete detection to wheel disc 2 inherent vice, now sound wave can be propagated in wheel disc 2, and be connected on wheel disc 2 due to blade root 1, therefore the two structurally has continuity, and sound wave can continue to propagate, and can complete the detection to blade root 1 inherent vice.
And also verify through test of many times, adopt the sound field sound pressure of focusing scanning larger than linear sweep sound pressure, and its flaw indication reflecting acoustic pressure intensity is large when detecting same defect, is convenient to the discovery of defect, focusing scanning is therefore adopted to be more conducive to defects detection.
As shown in Figure 2, a kind of compressor impeller defect phased array ultrasonic detecting method of the present invention, the other end that detection voussoir 3 is installing probe 4 position relative of employing has the cambered surface coordinated with the cylinder shape inner wall of described compressor impeller inner via hole.
This detection method specifically comprises the following steps,
(1) be connected with described detection voussoir 3 by couplant by probe 4, probe is placed into compressor impeller inner via hole after being connected with detection voussoir 3 and is adjacent to its cylinder shape inner wall, between detection voussoir 3 and cylinder shape inner wall, scribble couplant;
(2) detecting pattern of phased array ultrasonic detection instrument is set to focusing scanning;
(3) scan depths of phased array ultrasonic detection instrument is set to the maximum gauge of compressor impeller wheel disc 2, often group excites 8 or 16 wafers, starts to detect, and after one-time detection, records and stores testing result;
(4) detection voussoir 3 is moved to next detection position, repeats step 3), until detect the cylinder shape inner wall that voussoir 3 travels through compressor impeller inner via hole;
(5) scan depths of phased array ultrasonic detection instrument is set to the minor increment of compressor impeller blade root 1 distalmost end to the cylinder shape inner wall of compressor impeller inner via hole, often group excites 16 wafers, start to detect, after one-time detection, record and store testing result;
(6) detection voussoir 3 is moved to next detection position, repeats step 5), until detect the cylinder shape inner wall that voussoir 4 travels through compressor impeller inner via hole;
(7) compressor impeller defect phased array ultrasonic detection is completed.
In the present embodiment, described couplant is 30# machine oil, and density is 0.9g/cm3, and the velocity of sound is 1400m/s.
The cylinder shape inner wall internal diameter of described compressor impeller inner via hole is 68mm, described detection voussoir 3 material is organic glass, radius-of-curvature r is 51.8 ~ 68.1mm, the number of degrees corresponding to arc length detecting voussoir 3 are 13.5 °, thickness is 20 ~ 25mm, width is 30 ~ 40mm, is highly 60 ~ 70mm, and the velocity of sound is 2237m/s.
Adopt Multi2000 phased array ultrasonic detection instrument, it often group can excite 32 wafers at most, but the more accuracy of detection that can improve of the wafer once excited finds less defect brings detection efficiency low simultaneously, meeting under testing conditions, often group is set and excites 16 wafers, scanning stepping is 1 wafer, and origination wafer is the 1st wafer.
In described step (3), the maximum gauge of compressor impeller wheel disc is 15mm, and in described step (5), compressor impeller blade root distalmost end is 20mm to the minor increment of the cylinder shape inner wall of compressor impeller inner via hole.
Utilize electric spark at the preset diameter 0.6mm in cylinder shape inner wall 14mm place of wheel disc 2 inner distance impeller inner via hole, the flat-bottom hole of dark 10mm; At the blade root 1 inner distance impeller internal chamber wall 20mm preset diameter 0.8mm in place, after the flat-bottom hole of dark 10mm, method of the present invention is adopted to detect.
As shown in Figure 3, for hub disk Inner Defect Testing A sweep result figure, defectiveness place is stronger compared to the acoustic signals at zero defect place, show as B signal colour heavier, utilize B to show and significantly can recognize flaw indication, judge whether defect exists, Fig. 4 is the defect A sweep Signal aspects figure of a certain scanning position in wheel disc testing process, obvious jump signal is had at 13.9mm place in figure, this jump signal can be judged as flaw indication compared with the 14mm of actual defects position, and this is consistent more by force with flaw indication intensity.Utilize B display to show with A and can judge whether defect exists and position defect preferably.
As shown in Figure 5, for impeller blade root Inner Defect Testing B scanning result figure, similar to defects detection in wheel disc, whether defectiveness place is comparatively strong compared to the acoustic signals at zero defect place, shows as B signal colour heavier, utilize B display can pick out defect clearly and exist, Fig. 6 is the defect A sweep display figure of a certain position in blade root testing process, according to the position 19.4mm of sign mutation, the physical location 20mm of binding deficient, can position defect accurately.
Utilize phased array ultrasonic detecting method, can complete hub disk and blade root Inner Defect Testing, and show the existence that can judge defect accurately in conjunction with B display with A and defect is positioned.
Claims (5)
1. a compressor impeller defect phased array ultrasonic detecting method, it is characterized in that, the other end that the detection voussoir adopted is installing probe positions relative has the cambered surface coordinated with the cylinder shape inner wall of described compressor impeller inner via hole, and this detection method specifically comprises the following steps
(1) be connected with described detection voussoir by couplant by probe, probe is placed into compressor impeller inner via hole after being connected with detection voussoir and is adjacent to its cylinder shape inner wall, between detection voussoir and cylinder shape inner wall, scribble couplant;
(2) detecting pattern of phased array ultrasonic detection instrument is set to focusing scanning;
(3) scan depths of phased array ultrasonic detection instrument is set to the maximum gauge of compressor impeller wheel disc, often group excites 8 or 16 wafers, starts to detect, and after one-time detection, records and stores testing result;
(4) detection voussoir is moved to next detection position, repeats step 3), until detect the cylinder shape inner wall of voussoir traversal compressor impeller inner via hole;
(5) scan depths of phased array ultrasonic detection instrument is set to the minor increment of compressor impeller blade root distalmost end to the cylinder shape inner wall of compressor impeller inner via hole, often group excites 16 wafers, start to detect, after one-time detection, record and store testing result;
(6) detection voussoir is moved to next detection position, repeats step 5), until detect the cylinder shape inner wall of voussoir traversal compressor impeller inner via hole;
(7) compressor impeller defect phased array ultrasonic detection is completed.
2. a kind of compressor impeller defect phased array ultrasonic detecting method as claimed in claim 1, it is characterized in that, the cylinder shape inner wall internal diameter of described compressor impeller inner via hole is 68mm, described described detection voussoir material is organic glass, radius-of-curvature r is 51.8 ~ 68.1mm, and thickness is 20 ~ 25mm, and width is 30 ~ 40mm, be highly 60 ~ 70mm, the velocity of sound is 2237m/s.
3. a kind of compressor impeller defect phased array ultrasonic detecting method as claimed in claim 2, it is characterized in that, in described step (3), the maximum gauge of compressor impeller wheel disc is 15mm, and in described step (5), compressor impeller blade root distalmost end is 20mm to the minor increment of the cylinder shape inner wall of compressor impeller inner via hole.
4. a kind of compressor impeller defect phased array ultrasonic detecting method as claimed in claim 3, it is characterized in that, described couplant is 30# machine oil, and density is 0.9g/cm
3, the velocity of sound is 1400m/s.
5. a kind of compressor impeller defect phased array ultrasonic detecting method as claimed in claim 4, is characterized in that, described probe is Olympus5L64A2 type probe, and described phased array ultrasonic detection instrument is Multi2000 phased array ultrasonic detection instrument.
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Cited By (4)
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| CN105259253A (en) * | 2015-11-06 | 2016-01-20 | 国网山东省电力公司电力科学研究院 | Phased array detection method of main valve rod |
| CN105572228A (en) * | 2015-12-04 | 2016-05-11 | 南昌航空大学 | Imaging detection method of aviation impeller diffusion welding three-dimensional interface and multi-axis automatic scanning device of imaging detection method |
| CN109060956A (en) * | 2018-06-29 | 2018-12-21 | 中国能源建设集团科技发展有限公司 | Turbine shaft to assembly fir-tree root longitudinal wave ultrasonic detection method |
| CN112697880A (en) * | 2020-12-08 | 2021-04-23 | 苏州热工研究院有限公司 | Phased array ultrasonic detection method for sleeved rotor impeller |
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| CN112697880A (en) * | 2020-12-08 | 2021-04-23 | 苏州热工研究院有限公司 | Phased array ultrasonic detection method for sleeved rotor impeller |
| CN112697880B (en) * | 2020-12-08 | 2023-08-22 | 苏州热工研究院有限公司 | Phased array ultrasonic detection method for sleeved rotor impeller |
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Application publication date: 20151028 |