CN112924559A - Test block for ultrasonic detection of blade body and T-shaped blade root of steam turbine blade - Google Patents
Test block for ultrasonic detection of blade body and T-shaped blade root of steam turbine blade Download PDFInfo
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- CN112924559A CN112924559A CN202110106571.3A CN202110106571A CN112924559A CN 112924559 A CN112924559 A CN 112924559A CN 202110106571 A CN202110106571 A CN 202110106571A CN 112924559 A CN112924559 A CN 112924559A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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Abstract
The invention discloses a test block for ultrasonic detection of a turbine blade body and a T-shaped blade root, which comprises a test block body, wherein the test block body comprises a blade T-shaped blade root and a blade body at a shoulder part which are sequentially connected from bottom to top; the front side of the blade body is provided with a first artificial clamping groove and a second artificial notch groove; the back of the blade body is provided with a third manual notch groove and a fourth manual notch groove; a fifth artificial notch is formed in the back of the T-shaped blade root of the blade; the front of the T-shaped blade root of the blade is provided with a sixth artificial notch groove, and the test block can effectively improve the reliability of the blade body and the T-shaped blade root of the ultrasonic detection blade.
Description
Technical Field
The invention relates to a test block, in particular to a test block for ultrasonic detection of a blade body and a T-shaped blade root of a turbine blade.
Background
The turbine blade operates under the working conditions of high temperature, high pressure and high-speed rotation for a long time, and the surface state and the tissue performance of the blade are gradually degraded under the action of temperature and a medium; under the action of comprehensive factors such as stress, high-speed steam flow impact force and the like, stress concentration conditions can be generated at the joint of the blade body and the blade root and the sleeved part of the blade root and the rim of the steam turbine rotor, and harmful defects such as cracks and the like are generated at weak parts such as original defects, medium flowing corrosion scouring and the like and are rapidly expanded to cause serious equipment and personal casualty accidents. Therefore, the test block for ultrasonic detection of the blade body and the T-shaped blade root of the steam turbine blade is developed, the reference detection sensitivity in the field detection of the blade body and the T-shaped blade root of the steam turbine blade is standardized, and the test block has extremely important significance for ensuring the safe and economic operation of the steam turbine blade.
The ultrasonic detection can find the surface opening defect, the near surface defect and the internal defect of the blade, is the most important detection method in the nondestructive detection, has high detection efficiency and high accuracy, and is widely applied to the detection of the blade body and the blade root of the blade. Before detection is carried out, a regular reflector such as a manual groove on a test block is adopted, the echo signal of the reflector is adjusted to 80% of the full screen of the instrument, and then a certain dB value is adjusted to be used as the on-site detection sensitivity.
The conventional blade ultrasonic detection test block is mainly designed to be a circular through hole in a regular reflector during longitudinal wave detection, can not effectively simulate the blade or blade root to generate a crack-like planar easy-to-tear hazardous defect in the running process, can not determine the equivalent size of the defect, has a great divergence effect when the circular through hole is scanned by an ultrasonic sound beam, is not beneficial to detection sensitivity adjustment, and can not effectively simulate the cracking condition of a part with concentrated stress on the blade root. Therefore, a test block capable of simulating the actual cracking of the blade and the blade root is developed, and the reliability in ultrasonic detection can be greatly improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a test block for ultrasonic detection of a blade body and a T-shaped blade root of a steam turbine blade, which can effectively improve the reliability of ultrasonic detection of the blade body and the T-shaped blade root.
In order to achieve the purpose, the test block for ultrasonic detection of the blade body and the T-shaped blade root of the steam turbine blade comprises a test block body, wherein the test block body comprises a T-shaped blade root and a blade body at a shoulder part of the blade which are sequentially connected from bottom to top;
the front side of the blade body is provided with a first artificial clamping groove and a second artificial notch groove;
the back of the blade body is provided with a third manual notch groove and a fourth manual notch groove;
a fifth artificial notch is formed in the back of the T-shaped blade root of the blade;
and a sixth artificial notch is arranged on the front surface of the T-shaped blade root of the blade.
The thickness of the test block body is 20 mm; the height of the test block body is 240 mm;
the height of the blade body of the blade is 140 mm;
the height of the blade root is 100mm, the distance between the shoulder part and the upper step of the T-shaped blade root is 20mm, the distance between the upper step of the T-shaped blade root and the lower step of the T-shaped blade root is 60mm, and the distance between the lower step of the T-shaped blade root and the bottom of the T-shaped blade root is 20 mm.
The width of test block body is 80mm, and the width of blade body is 40mm, and the width on blade root upper portion is 80mm, and the width at blade root middle part is 20mm, and the width of blade root lower part is 60 mm.
The roughness of the surface of the test piece body is less than or equal to 1.6 mu m.
The distance between the first notch groove and the top of the blade body of the blade is 30mm, and the test block is formed by processing from the edge of the right side of the test block body, wherein the length of the first notch groove is 10mm, the width of the first notch groove is 0.15mm, and the depth of the first notch groove is 10 mm;
the distance between second cutting and the blade top is 60mm, and begins processing from the trial block body left side edge and forms, and the length of second cutting is 10mm, and the width is 0.15mm, and the degree of depth is 10 mm.
The distance between the third notch and the top of the blade body of the blade is 90mm, and the test block is formed by processing from the edge of the right side of the test block body, wherein the length of the third notch is 10mm, the width of the third notch is 0.15mm, and the depth of the third notch is 10 mm;
the distance between the fourth notch groove and the blade body is 120mm, the fourth notch groove is formed by processing the edge of the left side of the test block body, the length of the fourth notch groove is 10mm, the width of the fourth notch groove is 0.15mm, and the depth of the fourth notch groove is 10 mm.
The fifth notch groove is located on the upper step of the T-shaped blade root of the blade, the distance between the fifth notch groove and the top of the blade body of the blade is 160mm, the processing is started from the edge of the left side of the test block body, the length of the fifth notch groove is 10mm, the width of the fifth notch groove is 0.15mm, and the depth of the fifth notch groove is 20 mm.
The sixth notch groove is located on the lower step part of the T-shaped blade root of the blade, the distance between the sixth notch groove and the top of the blade body of the blade is 220mm, the processing is started from the edge of the right side of the test block body, the length of the sixth notch groove is 10mm, the width of the sixth notch groove is 0.15mm, and the depth of the sixth notch groove is 20 mm.
The invention has the following beneficial effects:
the test block for ultrasonic detection of the blade body and the T-shaped blade root of the steam turbine blade comprises a test block body, wherein the test block body comprises the T-shaped blade root and the blade body at the shoulder part of the blade which are sequentially connected from bottom to top, and the front side of the blade body is provided with a first artificial clamping groove and a second artificial carving groove; the back of the blade body is provided with a third manual notch groove and a fourth manual notch groove; a fifth artificial notch is formed in the back of the T-shaped blade root of the blade; the front surface of the T-shaped blade root of the blade is provided with a sixth artificial notch, the condition that the blade is cracked at different parts due to stress in the operation process is simulated, and the detection sensitivity of ultrasonic detection of the blade body of the blade is determined according to the artificial notches at different depths; the artificial notch of the T-shaped blade root of the blade is designed at the edge parts of the upper step and the lower step of the T-shaped blade root of the blade, the pressure of the steam flow on the blade is transmitted to the T-shaped blade root of the blade during operation, the stress is mainly concentrated at the 2 positions, the condition that the position is cracked is simulated, and the detection sensitivity of the ultrasonic detection of the T-shaped blade root of the blade is determined according to the 2 artificial notches.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a rear view of the present invention;
fig. 3 is a side view of the present invention.
Wherein, 1 is a first notch, 2 is a second notch, 3 is a third notch, 4 is a fourth notch, 5 is a sixth notch, and 6 is a sixth notch.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, 2 and 3, the test block for ultrasonic testing of a turbine blade body and a T-shaped blade root according to the present invention includes a test block body, wherein the test block body includes a T-shaped blade root and a blade body at a shoulder portion, which are sequentially connected from bottom to top; the front side of the blade body is provided with a first artificial clamping groove 1 and a second artificial notch 2; the back of the blade body is provided with a third manual notch 3 and a fourth manual notch 4; a fifth artificial notch 5 is arranged on the back of the T-shaped blade root of the blade; and a sixth artificial notch 6 is arranged on the front surface of the T-shaped blade root of the blade.
The thickness of the test block body is 20 mm; the height of the test block body is 240 mm; the height of the blade body of the blade is 140 mm; the height of the blade root is 100mm, the distance between the shoulder part and the upper step of the T-shaped blade root is 20mm, the distance between the upper step of the T-shaped blade root and the lower step of the T-shaped blade root is 60mm, and the distance between the lower step of the T-shaped blade root and the bottom of the T-shaped blade root is 20 mm.
The width of test block body is 80mm, and the width of blade body is 40mm, and the width on blade root upper portion is 80mm, and the width at blade root middle part is 20mm, and the width of blade root lower part is 60 mm.
The roughness of the surface of the test piece body is less than or equal to 1.6 mu m.
The distance between the first notch 1 and the top of the blade body of the blade is 30mm, and the test block is formed by processing from the edge of the right side of the test block body, wherein the length of the first notch 1 is 10mm, the width of the first notch is 0.15mm, and the depth of the first notch is 10 mm; the distance between the second notch 2 and the top of the blade body is 60mm, the test block is formed by processing the edge of the left side of the test block body, the length of the second notch 2 is 10mm, the width of the second notch is 0.15mm, and the depth of the second notch is 10 mm.
The distance between the third notch 3 and the top of the blade body of the blade is 90mm, and the test block is formed by processing from the edge of the right side of the test block body, the length of the third notch 3 is 10mm, the width of the third notch is 0.15mm, and the depth of the third notch is 10 mm; the distance between the fourth notch 4 and the blade body is 120mm, and the test block is formed by processing the edge of the left side of the test block body, the length of the fourth notch 4 is 10mm, the width of the fourth notch is 0.15mm, and the depth of the fourth notch is 10 mm.
The fifth notch 5 is located on the upper step of the T-shaped blade root of the blade, the distance between the fifth notch 5 and the top of the blade body of the blade is 160mm, the processing is started from the edge of the left side of the test block body, the length of the fifth notch 5 is 10mm, the width of the fifth notch is 0.15mm, and the depth of the fifth notch is 20 mm.
The sixth notch 6 is located on the lower step part of the T-shaped blade root of the blade, the distance between the sixth notch 6 and the top of the blade body of the blade is 220mm, the processing is started from the edge of the right side of the test block body, the length of the sixth notch 6 is 10mm, the width of the sixth notch is 0.15mm, and the depth of the sixth notch is 20 mm.
The method comprises the steps that a longitudinal wave straight probe or a small-angle longitudinal wave inclined probe is placed at the top of a test block before a blade body of a blade is detected by ultrasonic waves, the ultrasonic waves sequentially pass through a first notch 1, a second notch 2, a third notch 3 and a fourth notch 4, echo signals of the notches are adjusted to 80% of the full screen of an instrument, a DAC curve is manufactured, and a certain dB value is adjusted to serve as the on-site detection sensitivity.
Before the T-shaped blade root of the blade is detected by ultrasonic, a longitudinal wave straight probe or a small-angle longitudinal wave inclined probe is placed at the top of a test block, ultrasonic waves sequentially pass through a fifth notch 5 and a sixth notch 6, an echo signal of the notches is adjusted to 80% of the full screen of the instrument, and a certain dB value is adjusted to be used as the on-site detection sensitivity.
Before blade body and blade T-shaped blade root of the ultrasonic detection blade, the surface wave probe is placed on the front or back of the top of the test block, the probe is over against each notch, ultrasonic waves sequentially pass through a first notch 1, a second notch 2, a third notch 3, a fourth notch 4, a fifth notch 5 and a sixth notch 6, echo signals of the notches are adjusted to 80% of the full screen of the instrument, a DAC curve is made, and a certain dB value is adjusted to be used as the on-site detection sensitivity.
The invention considers the influence of factors such as blade surface cracking, edge effect, surface condition and the like on ultrasonic detection in actual detection, truly simulates various detection conditions encountered in the field, increases the detection method of a longitudinal wave straight probe and a small-angle longitudinal wave inclined probe, determines the corresponding detection sensitivity, and effectively detects the T-shaped blade root of the blade while detecting the blade body of the blade, so that the adaptability is wider.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments and application fields, and the above-described embodiments are illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.
Claims (8)
1. A test block for ultrasonic detection of a blade body and a T-shaped blade root of a steam turbine blade is characterized by comprising a test block body, wherein the test block body comprises a T-shaped blade root and a blade body at a shoulder part of the blade which are sequentially connected from bottom to top;
the front side of the blade body is provided with a first artificial clamping groove (1) and a second artificial notch groove (2);
the back of the blade body is provided with a third manual notch groove (3) and a fourth manual notch groove (4);
a fifth artificial notch groove (5) is arranged on the back of the T-shaped blade root of the blade;
and a sixth artificial notch groove (6) is formed in the front surface of the T-shaped blade root of the blade.
2. The test block for ultrasonic testing of blade bodies and T-shaped blade roots of steam turbine blades according to claim 1, wherein the thickness of the test block body is 20 mm; the height of the test block body is 240 mm;
the height of the blade body of the blade is 140 mm;
the height of the blade root is 100mm, the distance between the shoulder part and the upper step of the T-shaped blade root is 20mm, the distance between the upper step of the T-shaped blade root and the lower step of the T-shaped blade root is 60mm, and the distance between the lower step of the T-shaped blade root and the bottom of the T-shaped blade root is 20 mm.
3. The test block for ultrasonic testing of blade bodies and T-shaped blade roots of steam turbines according to claim 1, wherein the width of the test block body is 80mm, the width of the blade body is 40mm, the width of the upper portion of the blade root is 80mm, the width of the middle portion of the blade root is 20mm, and the width of the lower portion of the blade root is 60 mm.
4. The test block for ultrasonic testing of turbine blade bodies and T-roots according to claim 1, wherein the surface roughness of the block body is 1.6 μm or less.
5. The test block for the ultrasonic testing of the blade body and the T-shaped blade root of the steam turbine blade according to claim 1, wherein the distance between the first notch (1) and the top of the blade body is 30mm, and the test block is processed from the right edge of the test block body, the length of the first notch (1) is 10mm, the width of the first notch is 0.15mm, and the depth of the first notch is 10 mm;
the distance between the second notch groove (2) and the top of the blade body is 60mm, the test block is formed by processing the edge of the left side of the test block body, the length of the second notch groove (2) is 10mm, the width of the second notch groove is 0.15mm, and the depth of the second notch groove is 10 mm.
6. The test block for the ultrasonic testing of the blade body and the T-shaped blade root of the steam turbine blade according to claim 1, wherein the distance between the third notch (3) and the top of the blade body is 90mm, and the test block is processed from the right edge of the test block body, the length of the third notch (3) is 10mm, the width of the third notch is 0.15mm, and the depth of the third notch is 10 mm;
the distance between the fourth notch groove (4) and the blade body is 120mm, the test block is formed by processing the edge of the left side of the test block body, the length of the fourth notch groove (4) is 10mm, the width of the fourth notch groove is 0.15mm, and the depth of the fourth notch groove is 10 mm.
7. The test block for the ultrasonic testing of the blade body and the T-shaped blade root of the steam turbine blade according to claim 1, wherein the fifth notch (5) is located on the upper step of the T-shaped blade root of the blade, the distance between the fifth notch (5) and the top of the blade body is 160mm, and the processing is started from the left edge of the test block body, and the length of the fifth notch (5) is 10mm, the width is 0.15mm, and the depth is 20 mm.
8. The test block for the ultrasonic testing of the blade body and the T-shaped blade root of the steam turbine blade according to claim 1, wherein the sixth notch (6) is located on the lower step part of the T-shaped blade root of the blade, the distance between the sixth notch (6) and the top of the blade body is 220mm, the test block is machined from the right edge of the test block body, and the sixth notch (6) has the length of 10mm, the width of 0.15mm and the depth of 20 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110106571.3A CN112924559A (en) | 2021-01-26 | 2021-01-26 | Test block for ultrasonic detection of blade body and T-shaped blade root of steam turbine blade |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110106571.3A CN112924559A (en) | 2021-01-26 | 2021-01-26 | Test block for ultrasonic detection of blade body and T-shaped blade root of steam turbine blade |
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| CN112924559A true CN112924559A (en) | 2021-06-08 |
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| CN202110106571.3A Pending CN112924559A (en) | 2021-01-26 | 2021-01-26 | Test block for ultrasonic detection of blade body and T-shaped blade root of steam turbine blade |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535648A (en) * | 2014-12-03 | 2015-04-22 | 国网河南省电力公司电力科学研究院 | Method for detecting ultrasonic guided wave of turbine blades |
| CN106383175A (en) * | 2016-08-29 | 2017-02-08 | 中航动力股份有限公司 | Ultrasonic flaw detection test block for blade detection |
| CN210090385U (en) * | 2019-05-06 | 2020-02-18 | 西安热工研究院有限公司 | Gas turbine compressor blade root ultrasonic testing uses test block |
| CN210221927U (en) * | 2019-06-30 | 2020-03-31 | 深圳市中昌检测技术有限公司 | Smoke turbine blade phased array detects reference block |
-
2021
- 2021-01-26 CN CN202110106571.3A patent/CN112924559A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535648A (en) * | 2014-12-03 | 2015-04-22 | 国网河南省电力公司电力科学研究院 | Method for detecting ultrasonic guided wave of turbine blades |
| CN106383175A (en) * | 2016-08-29 | 2017-02-08 | 中航动力股份有限公司 | Ultrasonic flaw detection test block for blade detection |
| CN210090385U (en) * | 2019-05-06 | 2020-02-18 | 西安热工研究院有限公司 | Gas turbine compressor blade root ultrasonic testing uses test block |
| CN210221927U (en) * | 2019-06-30 | 2020-03-31 | 深圳市中昌检测技术有限公司 | Smoke turbine blade phased array detects reference block |
Non-Patent Citations (1)
| Title |
|---|
| 何成 等: "汽轮机Ｔ型叶根的超声相控阵检测", 《无损检测》 * |
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