CN105628787A - Nondestructive detection method for wind power yawing and pitch-variable bearing - Google Patents
Nondestructive detection method for wind power yawing and pitch-variable bearing Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/84—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields by applying magnetic powder or magnetic ink
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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 relates to the technical field of bearing detection, and relates to a nondestructive detection method for wind power yawing and pitch-variable bearing. The detection method is a comprehensive detection method including a magnetic particle detection method and an ultrasonic detection method, wherein the magnetic particle detection method is mainly used for detecting the defects on a surface and a near surface of a part; the ultrasonic detection method is mainly used for detecting the defects inside the part; all the defects of all positions inside or outside the bearing part can be detected by combined detection of the magnetic particle detection method and the ultrasonic detection method, and therefore the use reliability of the bearing is improved comprehensively; no blind region exists in a process of detecting the defects on an irregular curved surface of a rollway region on a ferrule by adopting yoke process magnetic particle inspection, and therefore the detection rate is high and the cost is saved.
Description
Technical field
The present invention relates to Bearing testing technical field, it relates to the lossless detection method of wind power yawing, pitch variable bearings.
Background technology
Wind power bearing manufacture is the industry that fast development is got up in recent years. Owing to wind power bearing feature is that environment for use is severe, high maintenance cost, long lifetime so that its process for machining and manufacturing, quality level require very high. The surface crack of bearing and subsurface defect are one of main factors affecting bearing work-ing life, and how effectively to detect out the defect of bearing when low cost and improve material use efficiency be the important topic of pendulum in face of defects detecting technology person.
Summary of the invention
The present invention be exactly in wind power yawing bearing and pitch variable bearings quality detection work exist defect, it is proposed to wind power yawing, pitch variable bearings lossless detection method, the method is method for comprehensive detection, specifically comprises magnetic powder detection method and ultrasonic detection method. The technical requirements that the present invention mainly proposes with reference to European standard EN10228, EN12668, ENISO9934, in conjunction with the technology feature of wind power bearing, and the magnetic powder detection method made and ultrasonic detection method.
The present invention solves the technical scheme of its technical problem: the lossless detection method of wind power yawing, pitch variable bearings, this detection method is method for comprehensive detection, comprise magnetic powder detection method and ultrasonic detection method, magnetic powder detection method is mainly used to the defect detecting piece surface and nearly surface, ultrasonic detection method is mainly used to detect the defect of inside parts, the two combines detection, the defect of all sites inside and outside bearing parts can both be detected, the steps include:
(1) magnetic powder detection method, the method is mainly used to the defect detecting piece surface and nearly surface
1, before flaw detection, bearing parts is carried out clean:
In order to ensure that all surfaces and nearly surperficial manufacturing defect can be detected, magnetic-particle inspection selection of time carries out after final mill processing, and piece surface is used rag wiped clean, it should not have the impurity such as greasy dirt, corrosion, scrap metal, sticky sand to exist. In order to detect out tiny defect, the surface roughness Ra of detected part must not be greater than 6.3 ��m;
2, before flaw detection, reply magnetic flaw detection ink concentration detects:
After magnetic flaw detection ink being stirred before magnetic flaw detection ink concentration determination, shower pipe mouth place magnetic flaw detection ink concentration determination pipe sampling 100mL is watered at magnetic flaw detection ink, then leaving standstill as then 40min��60min observes magnetic flaw detection ink volumetric concentration, the precipitation capacity recommendation value of fluorescent magnetic particles is 0.05mL/100mL��0.25mL/100mL is qualified;
3, before flaw detection, reply magnetic flaw detection ink purity detects:
Magnetic flaw detection ink should be pure, does not allow the impurity being mixed into emery wheel bits or the first-class impact display of fiber to exist. Adopt MTU-3 type standard test block inspection magnetic flaw detection ink, when the magnetic particle indications of MTU-3 type test piece and the difference of standard photographs are obvious, magnetic flaw detection ink should be changed in time;
4, before flaw detection, reply magnetic-particle inspection sensitivity detects:
Castrolstiptype2/A type Calibration Piece for Sensitivity is selected during flaw detection. Calibration Piece for Sensitivity is closely connected in the external diameter surface of bearing parts by mutually perpendicular two directions, and after magnetization spray, the magnetic particle indications in test piece at least should have two or more, and clear to be shown as sensitivity test qualified.
5, before flaw detection, the uv radiation intensity of response environment illumination and piece surface detects:
Luxmeter is adopted the environment illumination of flaw detection to be detected, require that white light illumination is not more than 20Lx, ultraviolet radiation meter is adopted to be detected by the uv radiation intensity at workpiece surface place, requiring that uv radiation intensity is not less than 1000 �� w/cm2, flaw detection work must carry out the light adaptation of more than 5 minutes before working;
6, yoke(magnetizing)method carrying out flaw detection:
The two poles of the earth of yoke are ridden on the corresponding position of ball track, distance between two poles should control between 50mm��200mm, effective inspection area is limited in two magnetic pole line both sides 1/4 maximum magnetic flux interpole gaps, during magnetization, distance between two poles should have the overlap of more than 25mm every time, magnetic flaw detection ink is drenched in spray, magnetization, stops stopping magnetization again after magnetic flaw detection ink is drenched in spray, then observing magnetic trace, piece surface must not have any crack defect;
7, detect with the lasso Special magnetic particle detector of tooth:
For the lasso with tooth, employing Special magnetic particle detector detects, select circumferential magnetization electric current within the scope of 0A��9000A, Calibration Piece for Sensitivity is adopted to determine circumferential magnetization electric current, longitudinal magnetization mmf continuously adjustabe within the scope of 0A��10000AT, Calibration Piece for Sensitivity is adopted to determine longitudinal magnetization mmf, employing continuous processing is detected a flaw, magnetic flaw detection ink is applied while magnetizing during magnetization, detected face is covered by magnetic flaw detection ink, and at least repeatedly magnetize twice, magnetizing time is 1s��3s, after stopping applying magnetic flaw detection ink, magnetization more than 1s should be continued, when applying magnetic flaw detection ink, should notice that the magnetic flaw detection ink of flowing must not destroy the magnetic trace formed, then magnetic trace is observed, piece surface must not have any crack defect,
8, record
Magnetic testing fills in Magnetic testing record after terminating, Magnetic testing report is provided after gathering, the content of magnetic-particle inspection record should comprise organization, device name, unit type, part mark, magnetizing parameters, be visited the quantity of workpiece, the sequence number of detection workpiece, qualified quantity, inspection persons eligible and signature, survey date, such as existing defects, defect record should comprise coordinate position, the size size of defect and distribution situation roughly;
(2) ultrasonic detection method, the method is mainly used to detect the defect of inside parts
1, before flaw detection, bearing parts is carried out clean:
In order to improve accuracy of detection, ensure that the subsurface defect in all directions of all sites can be detected as much as possible, the choose opportunities of ultrasound examination hole after forging Vehicle Processing and milling tooth before, piece surface is used rag wiped clean, the impurity such as greasy dirt, corrosion, scrap metal, sticky sand that do not have exist, roughness Ra��6.3 ��m of piece surface;
2, ultrasonic probe is selected before flaw detection:
To the UT (Ultrasonic Testing) of wind power bearing part, the straight beam probe B4S of GE company of employing U.S. production, twin crystal probe SEB-4 or SEB-40 ��, size are angle beam searching unit SWB45 ��-4 or SWB45 ��-2 of 14 �� 14. Use machine oil is couplant, must use same couplant when instrument calibration and during actually operating;
3, ultrasound examination sensitivity is determined before flaw detection:
(1) when adopting straight beam probe B4S, Scanning sensitivity can be determined by a kind of method in following method:
A) withDistance gain size curve (DAC method) is done based on flat hole,
B) when detection faces is parallel with bottom surface, or when cylindrical surface and thickness are greater than 3 times of probe near field region, end ripple reflection method can be used, do AVG curve;
(2) when adopting SEB-4 or SEB-40 �� of twin crystal to pop one's head in, withDistance gain size curve (DAC method) is done based on flat hole;
(3) when employing size is SWB45 ��-4 of 14 �� 14 or SWB45 ��-2 shear wave is popped one's head in, DAC method usesThe cross-drilled hole of diameter;
4, scanning mode is determined before flaw detection:
(1) should being swept in all cross sections of part on vertical two directions of workpiece during ultrasound examination and look into, probe moves to the coincidence of rare 10% every time, looks into whole part to guarantee to sweep completely, and manual sweep velocity must not more than 150mm/s;
(2) straight beam probe and twin crystal probe are that threaded shaft bearing ring outer diameter face and end face carry out 100% sweep and look into,
5, defect size and distribution is determined:
When adopting 3 kinds of probes that by above-mentioned scanning mode, bearing parts is carried out ultrasound examination respectively, when Defect Equivalent is more than or equal toTime, it is necessary to recording its equivalent size and the coordinate position on part thereof, the assessment of long strip type defect adopts 6dB method;
6, grade is checked and accepted:
(1) all be judged to white point, burning, shrinkage cavity, implosion type defect do not allow exist;
(2) current, the specification of quality of bearing parts performs by the standard of quality grade;
(3) except above-mentioned requirements, benchmark cross section can only be received in 5 discontinuous isolated points that can record occur at most.
7, record:
UT (Ultrasonic Testing) record should comprise organization, INSTRUMENT MODEL, probe specification, couplant, part mark, be visited the quantity of workpiece, qualified quantity, testing staff's qualification and signature, detection date. Such as existing defects, defect record should comprise coordinate position, defect size size and roughly distribution situation flaw detection the method for inspection, parameters.
The invention has the beneficial effects as follows: the magneticpowder testing method in ball track and flank of tooth induction quenching district. Easy and simple to handle, testing cost is low, highly sensitive. The ultrasonic detection method of bearing parts subsurface defect is highly sensitive, and blind area is little, it is possible to guarantees flaw detection sensitivity when not increasing the finishing allowance of forging, thus saves the material cost of bearing.
Magnetic powder detection method is mainly used to the defect detecting piece surface and nearly surface, ultrasonic detection method is mainly used to detect the defect of inside parts, the two combines detection, the defect of all sites inside and outside bearing parts can both be able to be detected, thus comprehensively improve the reliability that bearing uses, wherein the defect of the raceway region Irregular Boundary Surface on yoke(magnetizing)method magnetic-particle inspection detection lasso has without blind area, recall rate height, saves the advantages such as cost.
And ultrasonic detection method is owing to have employed import probe, and three kinds of probe joint-detection, there is blind area little, save the finishing allowance of forging, part need not be overturn, save time and manpower, highly sensitive.
Accompanying drawing explanation
Fig. 1 is straight beam probe and the twin crystal probe scanning schematic diagram of the present invention;
Fig. 2 is that the angle beam searching unit of the present invention is swept and looked into schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described: the wind power yawing of the present invention, the lossless detection method of pitch variable bearings, the steps include:
(1) magnetic powder detection method, the method is mainly used to the defect detecting piece surface and nearly surface
1, before flaw detection, bearing parts is carried out clean:
In order to ensure that all surfaces and nearly surperficial manufacturing defect can be detected, magnetic-particle inspection selection of time carries out after final mill processing, and piece surface is used rag wiped clean, it should not have the impurity such as greasy dirt, corrosion, scrap metal, sticky sand to exist. In order to detect out tiny defect, the surface roughness Ra of detected part must not be greater than 6.3 ��m;
2, before flaw detection, reply magnetic flaw detection ink concentration detects:
After magnetic flaw detection ink being stirred before magnetic flaw detection ink concentration determination, shower pipe mouth place magnetic flaw detection ink concentration determination pipe sampling 100mL is watered at magnetic flaw detection ink, then leaving standstill as then 40min��60min observes magnetic flaw detection ink volumetric concentration, the precipitation capacity recommendation value of fluorescent magnetic particles is 0.05mL/100mL��0.25mL/100mL is qualified;
3, before flaw detection, reply magnetic flaw detection ink purity detects:
Magnetic flaw detection ink should be pure, does not allow the impurity being mixed into emery wheel bits or the first-class impact display of fiber to exist. Adopt MTU-3 type standard test block inspection magnetic flaw detection ink, when the magnetic particle indications of MTU-3 type test piece and the difference of standard photographs are obvious, magnetic flaw detection ink should be changed in time;
4, before flaw detection, reply magnetic-particle inspection sensitivity detects:
Castrolstiptype2/A type Calibration Piece for Sensitivity is selected during flaw detection. Calibration Piece for Sensitivity is closely connected in the external diameter surface of bearing parts by mutually perpendicular two directions, and after magnetization spray, the magnetic particle indications in test piece at least should have two or more, and clear to be shown as sensitivity test qualified.
5, before flaw detection, the uv radiation intensity of response environment illumination and piece surface detects:
Luxmeter is adopted the environment illumination of flaw detection to be detected, require that white light illumination is not more than 20Lx, ultraviolet radiation meter is adopted to be detected by the uv radiation intensity at workpiece surface place, requiring that uv radiation intensity is not less than 1000 �� w/cm2, flaw detection work must carry out the light adaptation of more than 5 minutes before working;
6, yoke(magnetizing)method carrying out flaw detection:
The two poles of the earth of yoke are ridden on the corresponding position of ball track, distance between two poles should control between 50mm��200mm, effective inspection area is limited in two magnetic pole line both sides 1/4 maximum magnetic flux interpole gaps, during magnetization, distance between two poles should have the overlap of more than 25mm every time, magnetic flaw detection ink is drenched in spray, magnetization, stops stopping magnetization again after magnetic flaw detection ink is drenched in spray, then observing magnetic trace, piece surface must not have any crack defect;
7, detect with the lasso Special magnetic particle detector of tooth:
For the lasso with tooth, employing Special magnetic particle detector detects, select circumferential magnetization electric current within the scope of 0A��9000A, Calibration Piece for Sensitivity is adopted to determine circumferential magnetization electric current, longitudinal magnetization mmf continuously adjustabe within the scope of 0A��10000AT, Calibration Piece for Sensitivity is adopted to determine longitudinal magnetization mmf, employing continuous processing is detected a flaw, magnetic flaw detection ink is applied while magnetizing during magnetization, detected face is covered by magnetic flaw detection ink, and at least repeatedly magnetize twice, magnetizing time is 1s��3s, after stopping applying magnetic flaw detection ink, magnetization more than 1s should be continued, when applying magnetic flaw detection ink, should notice that the magnetic flaw detection ink of flowing must not destroy the magnetic trace formed, then magnetic trace is observed, piece surface must not have any crack defect,
8, record.
Magnetic testing fills in Magnetic testing record after terminating, Magnetic testing report is provided after gathering, the content of magnetic-particle inspection record should comprise organization, device name, unit type, part mark, magnetizing parameters, be visited the quantity of workpiece, the sequence number of detection workpiece, qualified quantity, inspection persons eligible and signature, survey date, such as existing defects, defect record should comprise coordinate position, the size size of defect and distribution situation roughly;
(2) ultrasonic detection method, the method is mainly used to detect the defect of inside parts
1, before flaw detection, bearing parts is carried out clean:
In order to improve accuracy of detection, ensure that the subsurface defect in all directions of all sites can be detected as much as possible, the choose opportunities of ultrasound examination hole after forging Vehicle Processing and milling tooth before, piece surface is used rag wiped clean, the impurity such as greasy dirt, corrosion, scrap metal, sticky sand that do not have exist, roughness Ra��6.3 ��m of piece surface;
2, ultrasonic probe is selected before flaw detection:
To the UT (Ultrasonic Testing) of wind power bearing part, the straight beam probe B4S of GE company of employing U.S. production, twin crystal probe SEB-4 or SEB-40 ��, size are angle beam searching unit SWB45 ��-4 or SWB45 ��-2 of 14 �� 14. Use machine oil is couplant, must use same couplant when instrument calibration and during actually operating;
3, ultrasound examination sensitivity is determined before flaw detection:
(1) when adopting straight beam probe B4S, Scanning sensitivity can be determined by a kind of method in following method:
C) withDistance gain size curve (DAC method) is done based on flat hole,
D) when detection faces is parallel with bottom surface, or when cylindrical surface and thickness are greater than 3 times of probe near field region, end ripple reflection method can be used, do AVG curve;
(2) when adopting SEB-4 or SEB-40 �� of twin crystal to pop one's head in, withDistance gain size curve (DAC method) is done based on flat hole;
(3) when employing size is SWB45 ��-4 of 14 �� 14 or SWB45 ��-2 shear wave is popped one's head in, DAC method usesThe cross-drilled hole of diameter;
4, scanning mode is determined before flaw detection:
(1) should being swept in all cross sections of part on vertical two directions of workpiece during ultrasound examination and look into, probe moves to the coincidence of rare 10% every time, looks into whole part to guarantee to sweep completely, and manual sweep velocity must not more than 150mm/s;
(2) straight beam probe and twin crystal probe are that threaded shaft bearing ring outer diameter face and end face carry out 100% sweep and look into, and as shown in Figure 1, namely the face indicated by grid is that the face of looking into is swept in flaw detection;
(3) angle beam searching unit carries out 100% sweep and look into two directions respectively around lasso outer diameter face, sweeps and looks into direction and region as shown in Figure 2;
5, defect size and distribution is determined:
When adopting 3 kinds of probes that by above-mentioned scanning mode, bearing parts is carried out ultrasound examination respectively, when Defect Equivalent is more than or equal toTime, it is necessary to recording its equivalent size and the coordinate position on part thereof, the assessment of long strip type defect adopts 6dB method;
6, grade is checked and accepted:
(1) all be judged to white point, burning, shrinkage cavity, implosion type defect do not allow exist;
(2) current, the standard that the specification of quality of bearing parts presses quality grade 4 in list 1 and table 2 performs;
(3) except above-mentioned requirements, benchmark cross section can only be received in 5 discontinuous isolated points that can record occur at most.
Table 1 straight beam probe quality grade, record level and standard for acceptance
In table 1, end ripple reduces coefficients R=Fn/Fo, n. In formula: the n=1 as t >=60mm, the n=2 as t��60mm. Fn is wave amplitude at the bottom of n-th time of discontinuous place. Fo, n are in the scope same with Fn, apart from wave amplitude at the bottom of n-th time of nearest normal region, discontinuous place. R only causes end ripple to decay fast for discontinuous existence. If end wave attenuation exceedes record level, should detect further.
Table 2 angle beam searching unit (DAC method) quality grade, record level and standard for acceptance
7, record:
UT (Ultrasonic Testing) record should comprise organization, INSTRUMENT MODEL, probe specification, couplant, part mark, be visited the quantity of workpiece, qualified quantity, testing staff's qualification and signature, detection date. Such as existing defects, defect record should comprise coordinate position, defect size size and roughly distribution situation flaw detection the method for inspection, parameters.
Claims (1)
1. the lossless detection method of wind power yawing, pitch variable bearings, it is characterized in that, this detection method is method for comprehensive detection, comprise magnetic powder detection method and ultrasonic detection method, magnetic powder detection method is mainly used to the defect detecting piece surface and nearly surface, and ultrasonic detection method is mainly used to detect the defect of inside parts, and the two combines, the defect of all sites inside and outside bearing parts being detected, its method steps is:
(1) magnetic powder detection method
1), before flaw detection, bearing parts is carried out clean:
Magnetic-particle inspection selection of time carries out after final mill processing, and piece surface is used rag wiped clean, it should not having the impurity such as greasy dirt, corrosion, scrap metal, sticky sand to exist, the surface roughness Ra of detected part must not be greater than 6.3 ��m;
2), before flaw detection, magnetic flaw detection ink concentration is detected:
After magnetic flaw detection ink being stirred before magnetic flaw detection ink concentration determination, shower pipe mouth place magnetic flaw detection ink concentration determination pipe sampling 100mL is watered at magnetic flaw detection ink, then leaving standstill as then 40min��60min observes magnetic flaw detection ink volumetric concentration, the precipitation capacity recommendation value of fluorescent magnetic particles is 0.05mL/100mL��0.25mL/100mL is qualified;
3), before flaw detection, magnetic flaw detection ink purity is detected:
Magnetic flaw detection ink should be pure, does not allow the impurity being mixed into emery wheel bits or the first-class impact display of fiber to exist, adopts MTU-3 type standard test block inspection magnetic flaw detection ink, when the magnetic particle indications of MTU-3 type test piece and the difference of standard photographs are obvious, should change magnetic flaw detection ink in time;
4), before flaw detection, magnetic-particle inspection sensitivity is detected:
Castrolstiptype2/A type Calibration Piece for Sensitivity is selected during flaw detection, Calibration Piece for Sensitivity is closely connected in the external diameter surface of bearing parts by mutually perpendicular two directions, after magnetization spray, the magnetic particle indications in test piece at least should have two or more, and clear to be shown as sensitivity test qualified
5), before flaw detection, the uv radiation intensity of environment illumination and piece surface is detected:
Luxmeter is adopted the environment illumination of flaw detection to be detected, require that white light illumination is not more than 20Lx, ultraviolet radiation meter is adopted to be detected by the uv radiation intensity at workpiece surface place, requiring that uv radiation intensity is not less than 1000 �� w/cm2, flaw detection work must carry out the light adaptation of more than 5 minutes before working;
6), yoke(magnetizing)method carrying out flaw detection:
The two poles of the earth of yoke are ridden on the corresponding position of ball track, distance between two poles should control between 50mm��200mm, effective inspection area is limited in two magnetic pole line both sides 1/4 maximum magnetic flux interpole gaps, during magnetization, distance between two poles should have the overlap of more than 25mm every time, magnetic flaw detection ink is drenched in spray, magnetization, stops stopping magnetization again after magnetic flaw detection ink is drenched in spray, then observing magnetic trace, piece surface must not have any crack defect;
7), detect with the lasso Special magnetic particle detector of tooth:
For the lasso with tooth, employing Special magnetic particle detector detects, select circumferential magnetization electric current within the scope of 0A��9000A, Calibration Piece for Sensitivity is adopted to determine circumferential magnetization electric current, longitudinal magnetization mmf continuously adjustabe within the scope of 0A��10000AT, Calibration Piece for Sensitivity is adopted to determine longitudinal magnetization mmf, employing continuous processing is detected a flaw, magnetic flaw detection ink is applied while magnetizing during magnetization, detected face is covered by magnetic flaw detection ink, and at least repeatedly magnetize twice, magnetizing time is 1s��3s, after stopping applying magnetic flaw detection ink, magnetization more than 1s should be continued, when applying magnetic flaw detection ink, should notice that the magnetic flaw detection ink of flowing must not destroy the magnetic trace formed, then magnetic trace is observed, piece surface must not have any crack defect,
(2) ultrasonic detection method
1), before flaw detection, bearing parts is carried out clean:
The choose opportunities of ultrasound examination is holed after forging Vehicle Processing and before milling tooth, piece surface is used rag wiped clean, it should not have the impurity such as greasy dirt, corrosion, scrap metal, sticky sand to exist, roughness Ra��6.3 ��m of piece surface;
2), ultrasonic probe is selected before flaw detection:
To the UT (Ultrasonic Testing) of wind power bearing part, the straight beam probe B4S of GE company of employing U.S. production, twin crystal probe SEB-4 or SEB-40 ��, size are angle beam searching unit SWB45 ��-4 or SWB45 ��-2 of 14 �� 14, use machine oil is couplant, must use same couplant when instrument calibration and during actually operating;
3), ultrasound examination sensitivity is determined before flaw detection:
(1) when adopting straight beam probe B4S, Scanning sensitivity can be determined by a kind of method in following method:
Distance gain size curve is done based on the flat hole of �� 2mm;
When detection faces is parallel with bottom surface, or when cylindrical surface and thickness are greater than 3 times of probe near field region, end ripple reflection method can be used, do AVG curve;
(2) when adopting SEB-4 or SEB-40 �� of twin crystal to pop one's head in, based on the flat hole of �� 2mm, distance gain size curve is done;
(3) when employing size is SWB45 ��-4 of 14 �� 14 or SWB45 ��-2 shear wave is popped one's head in, DAC method uses the cross-drilled hole of �� 3mm diameter;
4), scanning mode is determined before flaw detection:
(1) should being swept in all cross sections of part on vertical two directions of workpiece during ultrasound examination and look into, probe moves to the coincidence of rare 10% every time, looks into whole part to guarantee to sweep completely, and manual sweep velocity must not more than 150mm/s;
(2) straight beam probe and twin crystal probe are that threaded shaft bearing ring outer diameter face and end face carry out 100% sweep and look into;
(3) angle beam searching unit carries out 100% sweep and look into two directions respectively around lasso outer diameter face;
5) defect size and distribution, is determined:
When adopting 3 kinds of probes that by above-mentioned scanning mode, bearing parts is carried out ultrasound examination respectively, when Defect Equivalent is more than or equal to �� 2mm, it is necessary to record its equivalent size and the coordinate position on part thereof, the assessment of long strip type defect adopts 6dB method;
6), grade is checked and accepted:
(1) all be judged to white point, burning, shrinkage cavity, implosion type defect do not allow exist;
(2) specification of quality of bearing parts performs by the standard of quality grade;
(3) except above-mentioned requirements, only it is received in benchmark cross section and 5 discontinuous isolated points that can record occur at most.
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| CN201511018301.8A CN105628787A (en) | 2015-12-30 | 2015-12-30 | Nondestructive detection method for wind power yawing and pitch-variable bearing |
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| CN201511018301.8A CN105628787A (en) | 2015-12-30 | 2015-12-30 | Nondestructive detection method for wind power yawing and pitch-variable bearing |
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| CN108205014A (en) * | 2017-12-29 | 2018-06-26 | 江苏共昌轧辊股份有限公司 | The ultrasonic surface detection method of minor diameter working roll for forged steel cold rolling |
| CN109298067A (en) * | 2018-03-23 | 2019-02-01 | 上海宏钢电站设备铸锻有限公司 | A kind of lossless detection method for reducing cast steel part defect processing and appearing |
| CN110261474A (en) * | 2019-04-24 | 2019-09-20 | 武汉船用机械有限责任公司 | Failure detector for ring-shaped work pieces |
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| CN111261305A (en) * | 2019-12-30 | 2020-06-09 | 太原科技大学 | Nondestructive flaw detection method for reactor pressure vessel head of offshore floating nuclear power station |
| CN114113305A (en) * | 2021-09-29 | 2022-03-01 | 华电电力科学研究院有限公司 | Device and method for detecting bolt holes of cylinder body of steam turbine of thermal power plant |
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| CN204065018U (en) * | 2014-04-26 | 2014-12-31 | 国家电网公司 | A kind of yoke method detects the measurement test block of the degree of depth |
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| CN108205014A (en) * | 2017-12-29 | 2018-06-26 | 江苏共昌轧辊股份有限公司 | The ultrasonic surface detection method of minor diameter working roll for forged steel cold rolling |
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| CN114113305A (en) * | 2021-09-29 | 2022-03-01 | 华电电力科学研究院有限公司 | Device and method for detecting bolt holes of cylinder body of steam turbine of thermal power plant |
| CN114113305B (en) * | 2021-09-29 | 2023-06-16 | 华电电力科学研究院有限公司 | Device and method for detecting bolt holes of steam turbine cylinder body of thermal power plant |
| CN116297818A (en) * | 2023-05-17 | 2023-06-23 | 中国核工业二四建设有限公司 | Nondestructive testing method for steel lining wallboard |
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