CN114137081A - High-sensitivity small-blind-area ultrasonic detection method for bearing ring - Google Patents
High-sensitivity small-blind-area ultrasonic detection method for bearing ring Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 89
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- 238000007654 immersion Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000009933 burial Methods 0.000 claims description 8
- 238000003384 imaging method Methods 0.000 claims description 6
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- 230000000052 comparative effect Effects 0.000 claims description 5
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- 230000002452 interceptive effect Effects 0.000 claims description 4
- 238000007514 turning Methods 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 18
- 238000002604 ultrasonography Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000005242 forging Methods 0.000 description 4
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- 238000004458 analytical method Methods 0.000 description 2
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- 239000007787 solid Substances 0.000 description 2
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- G—PHYSICS
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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
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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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
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4454—Signal recognition, e.g. specific values or portions, signal events, signatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
Abstract
A high-sensitivity small-blind-area ultrasonic detection method for a bearing ring relates to a detection method for the bearing ring. The method solves the problems of low sensitivity and large blind area in the detection of the micro defects of the bearing ring by the existing water immersion ultrasonic detection method. The method comprises the following steps: firstly, preparing a flat-bottom hole contrast sample and a raceway flat-bottom hole sample; secondly, adjusting the sensitivity of the equipment; and thirdly, placing the raceway flat-bottom hole sample in a three-jaw chuck of water immersion ultrasonic equipment to be locked and centered, detecting the whole outer diameter surface of the raceway flat-bottom hole sample by adopting a longitudinal wave vertical incidence outer diameter surface mode, and shooting the focus of a probe on the outer diameter surface of the raceway flat-bottom hole sample to obtain detection data. The detection ferrule of the invention has a dead zone of 1.5mm of the incident surface and a dead zone of 0.8mm of the reflecting surface, ensures the complete coverage of internal detection, reduces the surface dead zone of ultrasonic detection and improves the defect control range. The invention can accurately detect and position the tiny defects and ensure the detection quality of water immersion ultrasound. The invention is suitable for the high-sensitivity small-blind-area ultrasonic detection of the bearing ring.
Description
Technical Field
The invention relates to a detection method of a bearing ring.
Background
The aviation main shaft bearing is an important transmission component of an aeroengine, and the working reliability of the aviation main shaft bearing irreplaceably influences the safety of aeronautical equipment. The data show that the failure rate of the aero bearing occupies a large proportion in various major mechanical accidents of the aero machinery. Therefore, the method has very important practical significance for safety detection of the aviation bearing, ensuring the failure rate of aviation equipment and reducing aviation accidents. The ring is an important component of the bearing, and along with the development and batch production of three-generation and four-generation machine products, the aviation bearing puts higher requirements on the aspects of reliability, quality, thrust-weight ratio, working conditions, service life and the like, so that the defect control on the bearing material is more and more strict. At present, a method which is suitable for detecting internal defects such as forging, folding and holes of aviation bearing forgings is a water immersion ultrasonic method.
The water immersion ultrasonic detection is mainly based on the propagation characteristic of ultrasonic waves in a workpiece, and is one of detection methods which are widely applied in the method for detecting internal micro-defects at present. The water immersion ultrasonic detection technology in the ultrasonic detection method is a more accurate detection method, and an automatic detection system is used and is combined with an automatic scanning device to realize curved surface tracking scanning, automatic data acquisition and recording, defect positioning and the like. The technical principle is that the physical characteristics of ultrasonic waves propagating in solid and liquid, such as reflection, refraction and mode conversion of the ultrasonic waves at an interface when two media have different impedances, and the energy of the ultrasonic waves propagating in the solid and liquid is attenuated. And the information such as the size, the position and the like of the defect equivalent is realized through signal receiving and analysis. The continuous improvement of the quality requirement of the aviation main shaft bearing provides a plurality of problems for the water immersion ultrasonic detection technology, such as the accurate measurement and positioning of micro defects, the high-sensitivity small-blind-area point focusing ultrasonic detection technology and the like.
The dead zone of the surface of the detection ring is large, and the single side of the total machining allowance of most bearing rings is small. In order to ensure the complete coverage of internal detection, only by increasing the machining allowance of a forging or increasing reverse incidence detection (which is not easy to realize for a smaller ferrule), the size of an incidence blind area needs to be reduced urgently, and the defect control range is improved. Ferrule defects are small, and higher requirements are put on how to define the influence of different depth defects, determine the ultrasonic acceptance level and control the positioning accuracy of detection.
Disclosure of Invention
The invention aims to solve the problems of low sensitivity and large blind area of the existing water immersion ultrasonic detection method for detecting the micro defects of the bearing ring, and provides the ultrasonic detection method with high sensitivity and small blind area for the bearing ring.
The high-sensitivity small-blind-area ultrasonic detection method for the bearing ring is realized according to the following steps:
firstly, sample preparation:
flat bottom hole comparative sample: the manufacturing material of the flat bottom hole contrast sample is 8Cr4Mo4V, is consistent with the ferrule to be detected, and has the same processing state and size, and the processing size is as follows: the number of the holes is 6, the hole diameters are phi 0.4mm, the diameters are 50.8mm, the burial depths are 1.6mm, 3.2mm, 6.4mm, 12.7mm, 25.4mm and 38.1mm respectively, and the thicknesses are 8.0mm, 9.6mm, 12.8mm, 19.1mm, 31.8mm and 44.5mm respectively;
raceway flat bottom hole test sample: taking a ferrule to be detected, manufacturing flat-bottom holes with different burial depths and near surfaces, wherein the diameter of the flat-bottom hole is phi 0.4mm, the hole depths are respectively 0.4mm, 0.8mm, 1.6mm, 3.2mm, 5mm and 6.4mm, the interval of each hole is 5mm, and the two groups are totally positioned at the center of the circular arc bottom of a channel of the ferrule to be detected and at the distance from the center of the circular arc bottom of the channel to the edge 1/2 of the raceway respectively;
secondly, adjusting the sensitivity of the equipment:
the flat-bottom hole contrast samples are sequentially placed from thin to thick according to the thickness sequence, the reflected wave of the flat-bottom hole with the buried depth of 1.6mm is adjusted to 80% at a high speed, the sensitivity at the moment is set as a reference sensitivity, the gain value of each flat-bottom hole contrast sample with the buried depth of 80% is sequentially recorded, a TCG curve is drawn, and after the TCG curve is manufactured, the reference sensitivity is improved by 10dB to obtain the detection sensitivity of phi 0.4mm-10 dB;
thirdly, detecting a blind area by ultrasonic detection:
and (3) placing the raceway flat bottom hole sample prepared in the step one in a water immersion ultrasonic device three-jaw chuck to be locked and centered, detecting the whole outer diameter surface of the raceway flat bottom hole sample by adopting a longitudinal wave vertical incidence outer diameter surface mode, and shooting the focus of a probe on the outer diameter surface of the raceway flat bottom hole sample to obtain detection data, namely finishing the high-sensitivity small-blind-area ultrasonic detection of the bearing ring.
And C, removing burrs caused in the machining process of the contrast sample with the flat-bottom hole in the step I, and rounding the upper side and the lower side.
The water immersion ultrasonic equipment in the third step adopts a Scan Master disc ring piece ultrasonic water immersion detection system, model LS-500, and has C-Scan imaging function and parameters: the detection sensitivity is phi 0.4mm-10dB equivalent flat-bottom hole, and the pulse repetition frequency is 600 Hz.
In the third step, the probe adopts a longitudinal wave point focusing straight probe with the frequency of 10MHz, the wafer size of 0.43 inch and the focal length of 3.5 inches.
And in the third step, the outer diameter surface is an ultrasonic incident surface, no impurity interfering an ultrasonic detection signal is required, the outer diameter surface is processed by adopting a round-head cutter, and turning lines are not required on the surface.
The invention has the following advantages:
aeroengine bearings, as an important transmission component, tend to have high internal quality acceptance requirements, and therefore sensitivity level requirements for ultrasonic testing are also very high. Meanwhile, the bearing has high requirements on the surface and near-surface quality, and the near-surface blind area of ultrasonic detection is expected to be as small as possible. However, for ultrasonic detection, the presence of a near-surface blind area is inevitable, and as the detection sensitivity increases, the near-surface blind area will also increase. Therefore, on the premise of ensuring that the requirement of high detection sensitivity is met, the blind area of ultrasonic detection is reduced as much as possible; the invention combines the forging processing mode of the bearing ring to manufacture the flat-bottom hole test block, sets the detection sensitivity according to factors such as the signal-to-noise ratio of ultrasonic detection, the size of a material noise signal and the like, controls the equivalent phi of 0.4mm to 10dB equivalent flat-bottom hole aiming at the current detection of the bearing ring, and makes the flat-bottom hole processed for determining the dead zone, wherein the signal of the current buried deep hole 0.4mm away from the back reflecting surface is smaller, the deep hole 0.8mm away from the back reflecting surface is clearly visible, the buried deep hole 1.5mm away from the incident surface is clearly visible, and the reflecting surface and the dead zone of the incident surface can be determined at present. The dead zone of the incidence surface of the detection ring is 1.5mm, and the dead zone of the reflection surface is 0.8mm, so that the whole coverage of internal detection is ensured, the surface dead zone of ultrasonic detection is reduced, and the defect control range is improved. The invention can accurately detect and position the tiny defects and ensure the detection quality of water immersion ultrasound.
The invention is suitable for the high-sensitivity small-blind-area ultrasonic detection of the bearing ring.
Drawings
FIG. 1 is a schematic representation of a sample of a raceway flat bottom hole of an example embodiment, where reference numeral 1 is at the channel width of a trench side 1/4; marking 2 as a processing point groove bottom; marks 3 and 4 are 5 flat bottom holes processed along the circumferential direction of the roller path, and the interval of each hole is 5 mm;
fig. 2 is a schematic diagram of the detection of a longitudinal wave point focusing straight probe in an embodiment, where D is a wafer size, F is a focal length, H is a water distance of 88.9mm, a is a position of a focal point in water, a 'is a position of the focal point in a detected object, l is a depth of the focal point in the detected object, and l' is a depth of the focal point in water;
FIG. 3 is a real view of the outer ring of the finished bearing ring in the embodiment;
FIG. 4 is a schematic diagram of longitudinal wave normal incidence and auxiliary end face detection performed on an outer diameter surface in an embodiment, where an incidence direction 3 is a main ultrasonic incidence surface, an incidence direction 1 is an auxiliary ultrasonic incidence surface, and an incidence direction 2 is an auxiliary ultrasonic incidence surface;
FIG. 5 is an ultrasonic C-scan of the example.
Detailed Description
The technical solution of the present invention is not limited to the following specific embodiments, but includes any combination of the specific embodiments.
The first embodiment is as follows: the high-sensitivity small-blind-area ultrasonic detection method for the bearing ring is realized according to the following steps:
firstly, sample preparation:
flat bottom hole comparative sample: the manufacturing material of the flat bottom hole contrast sample is 8Cr4Mo4V, is consistent with the ferrule to be detected, and has the same processing state and size, and the processing size is as follows: the number of the holes is 6, the hole diameters are phi 0.4mm, the diameters are 50.8mm, the burial depths are 1.6mm, 3.2mm, 6.4mm, 12.7mm, 25.4mm and 38.1mm respectively, and the thicknesses are 8.0mm, 9.6mm, 12.8mm, 19.1mm, 31.8mm and 44.5mm respectively;
raceway flat bottom hole test sample: taking a ferrule to be detected, manufacturing flat-bottom holes with different burial depths and near surfaces, wherein the diameter of the flat-bottom hole is phi 0.4mm, the hole depths are respectively 0.4mm, 0.8mm, 1.6mm, 3.2mm, 5mm and 6.4mm, the interval of each hole is 5mm, and the two groups are totally positioned at the center of the circular arc bottom of a channel of the ferrule to be detected and at the distance from the center of the circular arc bottom of the channel to the edge 1/2 of the raceway respectively;
secondly, adjusting the sensitivity of the equipment:
the flat-bottom hole contrast samples are sequentially placed from thin to thick according to the thickness sequence, the reflected wave of the flat-bottom hole with the buried depth of 1.6mm is adjusted to 80% at a high speed, the sensitivity at the moment is set as a reference sensitivity, the gain value of each flat-bottom hole contrast sample with the buried depth of 80% is sequentially recorded, a TCG curve is drawn, and after the TCG curve is manufactured, the reference sensitivity is improved by 10dB to obtain the detection sensitivity of phi 0.4mm-10 dB;
thirdly, detecting a blind area by ultrasonic detection:
and (3) placing the raceway flat bottom hole sample prepared in the step one in a water immersion ultrasonic device three-jaw chuck to be locked and centered, detecting the whole outer diameter surface of the raceway flat bottom hole sample by adopting a longitudinal wave vertical incidence outer diameter surface mode, and shooting the focus of a probe on the outer diameter surface of the raceway flat bottom hole sample to obtain detection data, namely finishing the high-sensitivity small-blind-area ultrasonic detection of the bearing ring.
The water immersion ultrasonic equipment in the third step of the embodiment has an automatic scanning device, can finish multi-axis accurate scanning and profiling tracking of curved surfaces and complex surfaces by using a precision mechanical system, has a water immersion ultrasonic imaging function, has a C scanning real-time imaging function in a detection process, and can judge and track and position defects.
In the third step of the embodiment, a longitudinal wave point focusing straight probe is adopted, the energy of a focusing area of the point focusing probe is large, the sensitivity is high, the diameter of a focus sound beam is small, the resolution is good, and the signal to noise ratio is good.
The second embodiment is as follows: the difference between the embodiment and the first embodiment is that burrs caused in the machining process of the flat-bottom hole contrast sample in the first step are removed, and the upper side and the lower side are rounded. The rest is the same as the first embodiment.
The third concrete implementation mode: the difference between the first embodiment and the second embodiment is that the water immersion ultrasonic equipment in the third step adopts a Scan Master disc ring piece ultrasonic water immersion detection system, model LS-500, and has a C-Scan imaging function and parameters: the detection sensitivity is phi 0.4mm-10dB equivalent flat-bottom hole, and the pulse repetition frequency is 600 Hz. The rest is the same as the first embodiment.
The fourth concrete implementation mode: the difference between this embodiment and the first embodiment is that in the third step, the probe employs a longitudinal wave point focusing straight probe with a frequency of 10MHz, a wafer size of 0.43 inch, and a focal length of 3.5 inches. The rest is the same as the first embodiment.
The fifth concrete implementation mode: the difference between this embodiment and the first embodiment is that the outer diameter surface in step three is an ultrasonic incident surface, and there is no impurity interfering with the ultrasonic detection signal, and the outer diameter surface should be machined by a round-head tool, and there should be no turning lines on the surface. The rest is the same as the first embodiment.
The noise interference that the lathe work line can cause in this embodiment.
The beneficial effects of the present invention are demonstrated by the following examples:
example (b):
the high-sensitivity small-blind-area ultrasonic detection method for the bearing ring is realized according to the following steps:
firstly, sample preparation:
flat bottom hole comparative sample: the manufacturing material of the flat bottom hole contrast sample is 8Cr4Mo4V, is consistent with the ferrule to be detected, and has the same processing state and size, and the processing size is as follows: the number of the holes is 6, the hole diameters are phi 0.4mm, the diameters are 50.8mm, the burial depths are 1.6mm, 3.2mm, 6.4mm, 12.7mm, 25.4mm and 38.1mm respectively, and the thicknesses are 8.0mm, 9.6mm, 12.8mm, 19.1mm, 31.8mm and 44.5mm respectively;
raceway flat bottom hole test sample: taking a ferrule to be detected, manufacturing flat-bottom holes with different burial depths and near surfaces, wherein the diameter of the flat-bottom hole is phi 0.4mm, the hole depths are respectively 0.4mm, 0.8mm, 1.6mm, 3.2mm, 5mm and 6.4mm, the interval of each hole is 5mm, and the two groups are totally positioned at the center of the circular arc bottom of a channel of the ferrule to be detected and at the distance from the center of the circular arc bottom of the channel to the edge 1/2 of the raceway respectively;
secondly, adjusting the sensitivity of the equipment:
the flat-bottom hole contrast samples are sequentially placed from thin to thick according to the thickness sequence, the reflected wave of the flat-bottom hole with the buried depth of 1.6mm is adjusted to 80% at a high speed, the sensitivity at the moment is set as a reference sensitivity, the gain value of each flat-bottom hole contrast sample with the buried depth of 80% is sequentially recorded, a TCG curve is drawn, and after the TCG curve is manufactured, the reference sensitivity is improved by 10dB to obtain the detection sensitivity of phi 0.4mm-10 dB;
thirdly, detecting a blind area by ultrasonic detection:
and (3) placing the raceway flat bottom hole sample prepared in the step one in a water immersion ultrasonic device three-jaw chuck to be locked and centered, detecting the whole outer diameter surface of the raceway flat bottom hole sample by adopting a longitudinal wave vertical incidence outer diameter surface mode, and shooting the focus of a probe on the outer diameter surface of the raceway flat bottom hole sample to obtain detection data, namely finishing the high-sensitivity small-blind-area ultrasonic detection of the bearing ring.
In the first step of this example, burrs caused during machining of the flat-bottom hole comparative sample were removed, and the upper and lower edges were rounded.
The material of the ferrule to be tested in the first step of the embodiment is 8Cr4Mo 4V.
In the third step of this embodiment, the water immersion ultrasonic device adopts a Scan Master disc ring ultrasonic water immersion detection system, model LS-500, and has a C-Scan imaging function, parameters: the detection sensitivity is phi 0.4mm-10dB equivalent flat-bottom hole, and the pulse repetition frequency is 600 Hz.
In the third step of this embodiment, the probe employs a straight longitudinal wave point focusing probe with a frequency of 10MHz, a wafer size of 0.43 inch, and a focal length of 3.5 inches.
In the third step of this embodiment, the outer diameter surface is an ultrasonic incident surface, and there is no impurity interfering with the ultrasonic detection signal, and the outer diameter surface should be processed by a round-nose tool, and there should be no turning line on the surface.
A schematic diagram of a raceway flat bottom hole sample in the first step of the embodiment is shown in fig. 1, and it can be seen that the center position of the circular arc bottom of the channel of the ferrule to be detected and the distance from the center of the circular arc bottom of the channel to the edge 1/2 of the raceway are located; where the distance of the raceway edge 1/2 is the location labeled 1 in fig. 1, i.e., the channel width of the channel side 1/4; the position marked as 2 is the groove bottom of the processing point; and marks 3 and 4 are 5 flat-bottom holes processed along the circumferential direction of the roller path, and the interval of each hole is 5 mm.
The detection schematic diagram of the longitudinal wave point focusing straight probe in this embodiment is shown in fig. 2, where D is the wafer size, F is the focal length, H is the water distance of 88.9mm, a is the position of the focal point in the water, a 'is the position of the focal point in the detected object, l is the depth of the focal point in the detected object, and l' is the depth of the focal point in the water.
In the second step of this embodiment, verification is performed after the sensitivity of the device is adjusted:
preparing test pieces with different surface roughness, and testing the ultrasonic effect of the back reflection wave height condition and the noise signal. Because the surface roughness of the actual forged piece ring is better, the field forged piece ring is used for carrying out the test. During detection, the ferrule is placed on a three-jaw chuck to be locked and self-centered, the turntable rotates, the focus of the water immersion ultrasonic probe is shot on the surface of the outer diameter, and the probe is vertically incident to the outer diameter and is scanned in a vertical stepping mode along the direction of the outer diameter; the 3 ferrules to be tested are marked 1, 2 and 3 respectively.
See table 1 for preparation:
| numbering | Outer diameter (mm) | Roughness μm of |
| 1# | 137 | 0.443 |
| 2# | 183 | 0.326 |
| 3# | 225 | 0.652 |
The verification results are shown in table 2: under the current test result, the larger noise signal under-10 dB is 16%, which is close to the upper limit of 20%, the number of gains which can be improved is small, the noise is obviously increased or even disappears under the condition of actual increase, and the sensitivity space which can be improved is small because the surface roughness of the part is small. Due to the limitation of detection materials, when the detection sensitivity is increased, the increase of material noise obviously affects the accurate identification of detection signals, and the signal-to-noise ratio is reduced.
TABLE 2
In the embodiment, the ultrasonic detection blind area is detected, the longitudinal wave direct incidence method is adopted to test the surface of the flat-bottom hole defect and the surface blind area, transmission correction and corresponding defect ultrasonic signal waveform analysis are carried out, and finally, a water immersion point focusing longitudinal wave probe of 10MHz, a wafer diameter of 0.43 inch and a focal length of 3.5 inches is determined and selected, phi 0.4mm-10dB is used as detection sensitivity, a probe with higher frequency is influenced by surface noise and material crystal grains, and clutter is relatively higher. The finished ferrule is an outer ring (figure 3), an outer diameter surface is selected for sound wave vertical incidence, and end surface detection is assisted (figure 4, wherein an incidence direction 3 is a main ultrasonic incidence surface, an incidence direction 1 is an auxiliary ultrasonic incidence surface, and an incidence direction 2 is an auxiliary ultrasonic incidence surface).
The outer diameter surface vertical incidence detection is adopted, the defect positions on the test piece are effectively detected, an ultrasonic C scanning graph is shown in figure 5, and the test shows that the flat-bottom hole with the depth of 0.4mm of the raceway surface hole of the finished bearing ring is also identified to a certain extent, but the signal is slightly weak, but the signal of the hole with the depth of 0.8mm is larger, so that the ultrasonic detection on the back reflection surface is relatively ideal and can be controlled to be 0.8 mm. The flat bottom hole pitch outer diameter can be calculated to be 1.5mm according to the fact that the thickness of the middle position of the roller path is 7.9mm in the dead zone of the incident surface, the hole signal is large, and the dead zone of the incident surface can reach 1.5mm when the signal to noise ratio is high.
Claims (5)
1. The ultrasonic detection method for the bearing ring with high sensitivity and small blind area is characterized by comprising the following steps:
firstly, sample preparation:
flat bottom hole comparative sample: the manufacturing material of the flat bottom hole contrast sample is 8Cr4Mo4V, is consistent with the ferrule to be detected, and has the same processing state and size, and the processing size is as follows: the number of the holes is 6, the hole diameters are phi 0.4mm, the diameters are 50.8mm, the burial depths are 1.6mm, 3.2mm, 6.4mm, 12.7mm, 25.4mm and 38.1mm respectively, and the thicknesses are 8.0mm, 9.6mm, 12.8mm, 19.1mm, 31.8mm and 44.5mm respectively;
raceway flat bottom hole test sample: taking a ferrule to be detected, manufacturing flat-bottom holes with different burial depths and near surfaces, wherein the diameter of the flat-bottom hole is phi 0.4mm, the hole depths are respectively 0.4mm, 0.8mm, 1.6mm, 3.2mm, 5mm and 6.4mm, the interval of each hole is 5mm, and the two groups are totally positioned at the center of the circular arc bottom of a channel of the ferrule to be detected and at the distance from the center of the circular arc bottom of the channel to the edge 1/2 of the raceway respectively;
secondly, adjusting the sensitivity of the equipment:
the flat-bottom hole contrast samples are sequentially placed from thin to thick according to the thickness sequence, the reflected wave of the flat-bottom hole with the buried depth of 1.6mm is adjusted to 80% at a high speed, the sensitivity at the moment is set as a reference sensitivity, the gain value of each flat-bottom hole contrast sample with the buried depth of 80% is sequentially recorded, a TCG curve is drawn, and after the TCG curve is manufactured, the reference sensitivity is improved by 10dB to obtain the detection sensitivity of phi 0.4mm-10 dB;
thirdly, detecting a blind area by ultrasonic detection:
and (3) placing the raceway flat bottom hole sample prepared in the step one in a water immersion ultrasonic device three-jaw chuck to be locked and centered, detecting the whole outer diameter surface of the raceway flat bottom hole sample by adopting a longitudinal wave vertical incidence outer diameter surface mode, and shooting the focus of a probe on the outer diameter surface of the raceway flat bottom hole sample to obtain detection data, namely finishing the high-sensitivity small-blind-area ultrasonic detection of the bearing ring.
2. The ultrasonic detection method for the bearing ring with high sensitivity and small blind area according to claim 1, wherein burrs caused in the machining of the contrast sample with the flat-bottom hole in the step one are removed, and the upper side and the lower side of the contrast sample are rounded.
3. The ultrasonic detection method for the bearing ring with high sensitivity and small blind area according to claim 1, characterized in that the water immersion ultrasonic equipment in the third step adopts a Scan Master disc ring piece ultrasonic water immersion detection system, model LS-500, and has C-Scan imaging function and parameters: the detection sensitivity is phi 0.4mm-10dB equivalent flat-bottom hole, and the pulse repetition frequency is 600 Hz.
4. The method of claim 1, wherein the probe in step three is a straight longitudinal wave point focusing probe with a frequency of 10MHz, a wafer size of 0.43 inch, and a focal length of 3.5 inches.
5. The ultrasonic detection method for the bearing ring with high sensitivity and small blind area according to claim 1, characterized in that the outer diameter surface in the third step is an ultrasonic incident surface, and is required to have no impurities interfering ultrasonic detection signals, the outer diameter surface is processed by a round-head cutter, and the surface should not have turning lines.
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