CN110320283B - Dual-channel probe adjusting mechanism and dual-channel probe water immersion high-frequency ultrasonic flaw detection method - Google Patents
Dual-channel probe adjusting mechanism and dual-channel probe water immersion high-frequency ultrasonic flaw detection method Download PDFInfo
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- 239000000523 sample Substances 0.000 title claims abstract description 196
- 238000001514 detection method Methods 0.000 title claims abstract description 56
- 230000007246 mechanism Effects 0.000 title claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000007654 immersion Methods 0.000 title claims abstract description 26
- 230000007547 defect Effects 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000007514 turning Methods 0.000 claims description 3
- 238000004164 analytical calibration Methods 0.000 claims description 2
- 230000001174 ascending effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 20
- 239000010959 steel Substances 0.000 abstract description 20
- 238000005192 partition Methods 0.000 abstract description 4
- 238000011156 evaluation Methods 0.000 abstract description 3
- 238000010998 test method Methods 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 description 8
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- 230000001360 synchronised effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0609—Display arrangements, e.g. colour displays
- G01N29/0645—Display representation or displayed parameters, e.g. A-, B- or C-Scan
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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
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
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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
- G01N29/04—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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
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- 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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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Abstract
The application relates to a double-channel probe adjusting mechanism and a double-channel probe water immersion high-frequency ultrasonic flaw detection method, and belongs to the technical field of steel flaw detection equipment. The device comprises a first probe frame and a second probe frame, wherein the first probe frame is fixed on a module, and the second probe frame is movably connected with the module through a fine adjustment mechanism and is used for slightly adjusting the horizontal rotation angle of the second probe frame; the first probe frame and the second probe frame bottom are respectively and movably connected with the corresponding first clamping opening and second clamping opening through horizontal adjusting mechanisms, the first clamping opening is used for setting a first probe, and the second clamping opening is used for setting a second probe. According to the application, the defects are positioned and analyzed by a test method for synchronously detecting internal macroscopic defects in the steel through 2 probes with different frequencies, and meanwhile, the internal macroscopic purity of the steel is evaluated; the partition detection of the sample to be detected is synchronously realized, the detection blind area of the sample is reduced, the detection accuracy is improved, and the comprehensive and rapid evaluation of the purity of the steel is facilitated.
Description
Technical Field
The invention relates to a double-channel probe adjusting mechanism and a double-channel probe water immersion high-frequency ultrasonic flaw detection method, and belongs to the technical field of steel flaw detection equipment.
Background
Along with the continuous improvement of the quality requirements of customers on steel, the purity of the steel is increasingly required as an important index of the quality of the steel. Therefore, the control and detection of internal macroscopic and microscopic defect sizes in steel is an important work for metallurgical technicians and inspectors.
There are many nondestructive testing methods for detecting the macroscopic purity of the steel, and ultrasonic flaw detection of steel is a more common method for detecting the quality of steel, and compared with other detection means, ultrasonic flaw detection has many advantages, such as: the device can detect on the premise of not damaging the workpiece, has no pollution, is harmless to human body, has more accurate detection result, is convenient to use, has high speed, is convenient for on-site detection and the like. In general, when a workpiece with a rough surface is subjected to flaw detection by a conventional water mill method, the detection effect is often poor, and the water immersion ultrasonic flaw detection can be well suitable for flaw detection of the workpiece. The water immersion ultrasonic detection method has the characteristics of stable signal, high signal-to-noise ratio, easy realization of automation and the like. However, the signal intensity of the water immersion ultrasonic detection is very weak, so that the defect echo in the workpiece can be found by adjusting the gain of an attenuator to be very high, and according to experimental study, when the probe with the same frequency is used, the signal intensity of the water immersion ultrasonic detection is about 20dB different from the signal intensity of the water grinding method. Therefore, a focusing probe is generally used for increasing the signal intensity in water immersion flaw detection, and although the method can increase the signal intensity to a certain extent, the actual detection effect is not very ideal due to uneven sound beam distribution of the focusing probe, and the defect parameters of steel can be detected only by repeated flaw detection, so that the detection time is greatly wasted, and the detection efficiency is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a double-channel probe adjusting mechanism for installing two ultrasonic probes which operate simultaneously aiming at the prior art, thereby realizing a double-channel probe water immersion high-frequency ultrasonic flaw detection method, and detecting defects with different depths and sizes in steel materials by adopting two probes with different detection frequencies through one-time detection, shortening the detection time and improving the detection accuracy.
The invention solves the problems by adopting the following technical scheme: the two-channel probe adjusting mechanism is arranged on a module capable of ascending and descending in the Z-axis direction (vertical direction), and comprises a first probe frame and a second probe frame, wherein the first probe frame is fixed on the module, and the second probe frame is movably connected with the module through a fine adjustment mechanism and is used for slightly adjusting the deflection of the second probe frame relative to the Z-axis direction; the first probe frame and the second probe frame bottom are respectively and movably connected with the corresponding first clamping opening and second clamping opening through horizontal adjusting mechanisms and are used for adjusting the positions of the first clamping opening and the second clamping opening in the horizontal direction, the first clamping opening is used for setting the first probe, and the second clamping opening is used for setting the second probe.
The fine adjustment mechanism comprises a movable disc, an elastic ejection rod, an ejection micrometer rod and a shifting block, wherein the movable disc is vertically arranged on the side face of the module, the movable disc can deflect in a vertical plane around the center of the movable disc, the shifting block is fixed at the edge of the movable disc, the elastic ejection rod is positioned on one side of the shifting block and always elastically pushes the shifting block, and the ejection micrometer rod is positioned on the other side of the shifting block and reversely pushes the shifting block to enable the elastic ejection rod to be reversely resisted.
The horizontal adjusting mechanism comprises a fixed block, an adjusting block and an adjusting screw, wherein the fixed block is fixed at the bottom of the probe frame, the adjusting block is fixedly connected with the clamping opening, the adjusting screw is horizontally arranged on the fixed block, the adjusting screw is in threaded connection with the adjusting block, and the adjusting block can horizontally displace along the rotating adjusting screw.
A water immersion high-frequency ultrasonic flaw detection method of a double-channel probe specifically comprises the following steps:
(1) Two-channel probe adjusting mechanism installation: the method comprises the steps of arranging a double-channel probe adjusting mechanism on a module of a Z-axis of a water immersion high-frequency ultrasonic flaw detector, arranging two probes with different frequencies in a first clamping opening and a second clamping opening, and connecting the two probes with a standard UHF interface;
(2) And (3) instrument calibration and debugging: setting a standard sample in a water tank of a high-frequency ultrasonic flaw detector, and adjusting the incidence angles of the first probe and the second probe to enable the incidence directions of the first probe and the second probe to be perpendicular to a flat bottom hole on the standard sample; the distance between the probe and the water layer is adjusted through the position of the adjusting module in the Z-axis direction, so that the echo of the flat bottom hole defect on the standard sample is maximum; adjusting the gain and determining basic dB values of the two probes;
(3) Sample heat treatment and processing: after heat treatment is carried out on the round bar sample to be detected, turning a wagon on the surface of the sample and polishing the wagon, so that a detection blind area is reduced;
(4) Sample scanning: the round bar sample in the third step is arranged on a chuck of a water tank of the water immersion high-frequency ultrasonic flaw detector, a double-channel mode is started, the water immersion ultrasonic flaw detector is subjected to system zeroing, and then the incidence angles of the first probe and the second probe and the probe height are adjusted; inputting sample parameters and flaw detection stepping speed of a flaw detector, so that the first probe and the second probe synchronously scan and detect;
(5) And (3) detection: the two probes respectively form A, C scan patterns after the scanning is finished; in the A scanning diagram, when the inclusion is scanned, sound waves are reflected, the height of the reflection waves on the ordinate in the diagram represents the size of the inclusion, and the abscissa represents the position and depth of the inclusion from the surface of the sample; projection image corresponding to the A scan image, namely C scan image: the intensity of the color represents the height of the reflected wave, and the abscissa represents the expansion of the sample; the ordinate indicates the size and number of inclusions;
if the inclusion in the sample needs to be positioned and analyzed, a C scanning image is opened through analysis software, a probe return function is applied to move to the position of the inclusion, the sample is rotated by 360 degrees, when the reflection echo of the inclusion is maximum, a mark is made on the surface of the sample vertically below the probe, the mark is the position closest to the inclusion on the surface, and meanwhile, the size, the quantity and the distribution information of the inclusion are recorded.
The length of the sample in the third step is 300-600 mm, the diameter is 30-120 mm, and the finish is less than 1.0 mu m, and the curvature is less than or equal to 2mm/m.
Compared with the prior art, the invention has the advantages that: a dual-channel probe adjusting mechanism and a dual-channel probe water immersion high-frequency ultrasonic flaw detection method are provided, the dual-channel probe adjusting mechanism is directly arranged on a Z axis of a water immersion ultrasonic flaw detector, and defects are positioned and analyzed through a test method for synchronously detecting internal macroscopic defects in steel by using 2 probes with different frequencies, and meanwhile, the internal macroscopic purity of the steel is evaluated. The whole test period is short, the samples are not damaged, the radial partition detection of the samples to be tested is synchronously realized, the detection dead zone of the samples is further reduced, the detection accuracy is improved, the comprehensive and rapid evaluation of the purity of the steel is facilitated, and the method is very important for further inclusion positioning and anatomic qualitative analysis.
Drawings
FIG. 1 is a schematic diagram of a dual channel probe adjustment mechanism according to an embodiment of the present invention;
FIG. 2 is a graph A of a 10MHz probe scan;
FIG. 3 is a graph C of a 10MHz probe scan;
FIG. 4 is a graph A of a 25MHz probe scan;
FIG. 5 is a graph C of a 25MHz probe scan;
In the figure, a module 1, a fine adjustment mechanism 2, an ejection micrometer 2.1, a movable disc 2.2, an elastic ejection rod 2.3, a shifting block 2.4, a first probe frame 3, a second probe frame 4, a first clamping opening 5, a second clamping opening 6, a horizontal adjustment mechanism 7, a fixed block 7.1, an adjustment block 7.2 and an adjustment screw 7.3 are arranged.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1, a two-channel probe adjusting mechanism in the present embodiment is provided on a module 1 that can be lifted and lowered in the Z-axis direction. The adjusting mechanism comprises a first probe frame 3 and a second probe frame 4 which are arranged on the same side, wherein the first probe frame 3 is fixed on the module 1, the second probe frame 4 is movably connected with the module 1 through a fine adjusting mechanism 2, and the fine adjusting mechanism 2 is used for slightly adjusting the rotation angle of the second probe frame; the bottoms of the first probe frame 3 and the second probe frame 4 are respectively and movably connected with the corresponding first clamping opening 5 and the corresponding second clamping opening 6 through a horizontal adjusting mechanism 7, and the horizontal adjusting mechanism 7 adjusts the positions of the first clamping opening 5 and the second clamping opening 6. The first probe is arranged in the first clamping opening 5 and the second probe is arranged in the second clamping opening 6. The height of the first probe and the second probe is adjusted by adjusting the position of the module 1 on the Z axis; the horizontal adjusting mechanism 7 adjusts the incidence angle of the first probe; the horizontal adjusting mechanism 7 and the fine adjusting mechanism 2 adjust the incident angle of the second probe, so that synchronous detection of the two probes is realized, the partition detection of the sample to be detected is realized, the detection time is effectively shortened, and the detection efficiency of the sample is greatly improved.
The fine adjustment mechanism comprises a movable disc 2.2, an elastic ejection rod 2.3, an ejection micrometer rod 2.1 and a shifting block 2.4, wherein the movable disc 2.2 is vertically arranged on the side surface of the module 1, the movable disc 2.2 can deflect in a vertical plane around the center of the movable disc 2.2, the movable disc 2.2 is fixedly connected with the second probe frame 4, and when the movable disc 2.2 deflects, the second probe frame 4 synchronously deflects. The shifting block 2.4 is fixed at the top edge of the movable disc 2.2, the elastic ejection rod 2.3 is positioned at one side of the shifting block 2.4 and always elastically pushes against the shifting block 2.4, the ejection dial indicator 2.1 is arranged in the movable disc 2.2, and the ejection dial indicator 2.1 is positioned at the other side of the shifting block 2.4 to reversely push against the shifting block 2.4 so as to reversely resist the elastic ejection rod 2.3. When the ejection micrometer rod 2.1 approaches the elastic ejection rod 2.3, the ejection micrometer rod 2.1 props against the shifting block 2.4 to approach the ejection rod 2.3 and presses the ejection rod 2.3 back, and the shifting block 2.4 drives the movable disc 2.2 to deflect towards the elastic ejection rod 2.3; when the ejection micrometer rod 2.1 is far away from the elastic ejection rod 2.3, the elastic ejection rod 2.3 ejects and drives the shifting block 2.4 to approach the ejection micrometer rod 2.1, and the shifting block 2.4 drives the movable disc 2.2 to deflect towards the ejection micrometer rod 2.1 side so as to adjust the deflection angle of the second probe frame 4.
The ejector pin in this embodiment is the micrometer head of an outside micrometer.
Above-mentioned horizontal adjustment mechanism 7 includes fixed block 7.1 and regulating block 7.2, and fixed block 7.1 is fixed in the probe frame bottom, regulating block 7.2 and clamping mouth fixed connection are equipped with the recess on the fixed block 7.1, are equipped with the lug on the regulating block 7.2, and the recess matches and inserts regulating screw 7.3 in fixed block 7.1 and the regulating block 7.2 with the lug for fixed block 7.1 and regulating screw 7.3 fixed connection, regulating block 7.2 and regulating screw 7.3 swing joint. When the adjusting screw 7.3 is rotated, the adjusting block 7.2 moves along the track of the adjusting screw 7.3, so that the position of the clamping block is adjusted.
The water immersion high-frequency ultrasonic flaw detection method of the double-channel probe specifically comprises the following steps:
Step one: the method comprises the steps that a double-channel probe adjusting mechanism is arranged on a module 1 of a Z axis of a water immersion high-frequency ultrasonic flaw detector, a 10MHz probe serving as a first probe and a 25MHz probe serving as a second probe are respectively arranged in a first clamping opening 5 and a second clamping opening 6, and the two probes are connected with a standard UHF interface and connected with image analysis software;
Step two: placing a standard sample in a water tank of a high-frequency ultrasonic flaw detector, firstly adjusting a horizontal adjusting mechanism 7, and then adjusting a fine adjusting mechanism 2, so that a first probe, a second probe and a flat bottom hole on the standard sample are mutually perpendicular (namely, the incident angle is 90 °); the distance between the first probe and the second probe and the water layer is adjusted through manually adjusting the position of the module 1 on the Z axis, so that the maximum amplitude of the flat bottom hole defect echo on the standard sample is achieved; and a locking module. At this time, the gain is adjusted so that the amplitude is 80%, and the basic dB values of 2 probes are determined;
Step three: taking a round bar sample with the length of about 300mm and the diameter of about 60mm, quenching and tempering, turning a skin on the surface of the round bar sample, and polishing to ensure that the finish degree of the sample is 0.8 mu m and the bending degree is 1.8mm/m, thereby reducing the detection blind area;
Step four: the round bar sample in the third step is arranged on a chuck of a water tank of the water immersion high-frequency ultrasonic flaw detector, a double-channel mode is started, the water immersion ultrasonic flaw detector is subjected to system zeroing, the incidence angle of a first probe is firstly adjusted to be 90 degrees through a horizontal adjusting mechanism, the incidence angle of a second probe is adjusted through the horizontal adjusting mechanism and a fine adjusting mechanism, the incidence angle is made to be 90 degrees, and then the heights of the first probe and the second probe are adjusted; parameters such as sample parameters, flaw detection steps, speed and the like of the flaw detector are input into the water immersion high-frequency ultrasonic flaw detector, so that synchronous scanning detection of the double probes is realized;
Step five: as shown in fig. 2, 3, 4 and 5, after the scanning is finished, each double probe forms A, C scanning images, sound waves are reflected when the inclusions are scanned in the A scanning images, the height of the reflection waves on the ordinate represents the size of the inclusions, and the abscissa represents the positions and depths of the inclusions from the surface of the sample; projection image corresponding to the A scan image, namely C scan image: the intensity of the color represents the height of the reflected wave, and the abscissa represents the expansion of the sample; the ordinate indicates the size and number of inclusions;
if the inclusion in the sample needs to be positioned and analyzed, a C scanning image is opened through analysis software, a probe return function is applied to move to the position of the inclusion, the sample is rotated by 360 degrees, when the reflection echo of the inclusion is maximum, a mark is made on the surface of the sample vertically below the probe, the mark is the position closest to the inclusion on the surface, and meanwhile, the size, the quantity and the distribution information of the inclusion are recorded.
The whole steps include: ① The double-channel probe adjusting mechanism and the mounting of the probe; ② Performing high-frequency ultrasonic flaw detector calibration by using a standard sample; ③ Processing a sample; ④ After the sample is installed, the double probes perform scanning detection at the same time; ⑤ And respectively analyzing and determining the size, the number, the distribution and other information of the defects in the sample according to A, C scan patterns formed by the two frequency probes.
The invention directly sets a double-channel probe adjusting mechanism on the water immersion ultrasonic flaw detector, and the defects with different depths are positioned and analyzed by a test method for synchronously detecting internal macroscopic defects in steel by using 2 probes with different frequencies, and meanwhile, the internal macroscopic purity of the steel is evaluated. The whole test period is short, the sample is not damaged, the partition detection of the sample to be tested is synchronously realized, the detection blind area of the sample is further reduced, the detection accuracy is improved, the comprehensive and rapid evaluation of the purity of the steel is facilitated, and the method is very important for further inclusion positioning and anatomic qualitative analysis.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions that are formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.
Claims (3)
1. The double-channel probe adjusting mechanism is arranged on a module (1) capable of ascending and descending in the Z-axis direction and comprises a first probe frame (3) and a second probe frame (4), wherein the first probe frame (3) is fixed on the module, and the second probe frame (4) is movably connected with the module (1) through a fine adjusting mechanism (2) and is used for slightly adjusting the deflection of the second probe frame (4) relative to the Z-axis direction; the bottoms of the first probe frame (3) and the second probe frame (4) are respectively and movably connected with a corresponding first clamping opening (5) and a corresponding second clamping opening (6) through a horizontal adjusting mechanism (7) and are used for adjusting the positions of the first clamping opening (5) and the second clamping opening (6) in the horizontal direction, the first clamping opening (5) is used for setting a first probe, and the second clamping opening (6) is used for setting a second probe;
The fine adjustment mechanism (2) comprises a movable disc (2.2), an elastic ejection rod (2.3), an ejection micrometer rod (2.1) and a shifting block (2.4), wherein the movable disc (2.2) is vertically arranged on the side face of the module (1), the movable disc can deflect in a vertical plane around the center of the movable disc, the shifting block (2.4) is fixed at the edge of the movable disc (2.2), the elastic ejection rod (2.3) is positioned on one side of the shifting block (2.4) and always elastically pushes the shifting block, and the ejection micrometer rod is positioned on the other side of the shifting block (2.4) to reversely push the shifting block (2.4) so as to reversely resist the elastic ejection rod (2.3);
The horizontal adjusting mechanism (7) comprises a fixed block (7.1), an adjusting block (7.2) and an adjusting screw (7.3), wherein the fixed block (7.1) is fixed at the bottom of the probe frame, the adjusting block (7.2) is fixedly connected with the clamping opening, the adjusting screw (7.3) is horizontally arranged on the fixed block (7.1), the adjusting screw (7.3) is in threaded connection with the adjusting block (7.2), and the adjusting block (7.2) can horizontally displace along the rotating adjusting screw (7.3).
2. A two-channel probe water immersion high-frequency ultrasonic flaw detection method based on the two-channel probe adjusting mechanism as claimed in claim 1, which is characterized in that: the method specifically comprises the following steps:
Step one: two-channel probe adjusting mechanism installation: the two-channel probe adjusting mechanism is arranged on a module (1) of a Z-axis of the water immersion high-frequency ultrasonic flaw detector, two probes with different frequencies are arranged in a first clamping opening (5) and a second clamping opening (6), and the two probes are connected with a standard UHF interface;
Step two: and (3) instrument calibration and debugging: setting a standard sample in a water tank of a high-frequency ultrasonic flaw detector, and adjusting the incidence angles of the first probe and the second probe to enable the incidence directions of the first probe and the second probe to be perpendicular to a flat bottom hole on the standard sample; the distance between the probe and the water layer is adjusted through the position of the adjusting module (1) in the Z-axis direction, so that the echo of the flat bottom hole defect on the standard sample is maximum; adjusting the gain and determining basic dB values of the two probes;
step three: sample heat treatment and processing: after heat treatment is carried out on the round bar sample to be detected, turning a wagon on the surface of the sample and polishing the wagon, so that a detection blind area is reduced;
Step four: sample scanning: the round bar sample in the third step is arranged on a chuck of a water tank of the water immersion high-frequency ultrasonic flaw detector, a double-channel mode is started, the water immersion ultrasonic flaw detector is subjected to system zeroing, and then the incidence angles of the first probe and the second probe and the probe height are adjusted; inputting sample parameters and flaw detection stepping speed of a flaw detector, so that the first probe and the second probe synchronously scan and detect;
Step five: and (3) detection: the two probes respectively form A, C scan patterns after the scanning is finished; in the A scanning diagram, when the inclusion is scanned, sound waves are reflected, the height of the reflection waves on the ordinate in the diagram represents the size of the inclusion, and the abscissa represents the position and depth of the inclusion from the surface of the sample; projection image corresponding to the A scan image, namely C scan image: the intensity of the color represents the height of the reflected wave, and the abscissa represents the expansion of the sample; the ordinate indicates the size and number of inclusions;
if the inclusion in the sample needs to be positioned and analyzed, a C scanning image is opened through analysis software, a probe return function is applied to move to the position of the inclusion, the sample is rotated by 360 degrees, when the reflection echo of the inclusion is maximum, a mark is made on the surface of the sample vertically below the probe, the mark is the position closest to the inclusion on the surface, and meanwhile, the size, the quantity and the distribution information of the inclusion are recorded.
3. The method according to claim 2, characterized in that: the length of the sample in the third step is 300-600 mm, the diameter is 30-120 mm, and the finish is less than 1.0 mu m, and the curvature is less than or equal to 2mm/m.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001004602A (en) * | 1999-06-16 | 2001-01-12 | Sumitomo Metal Ind Ltd | Ultrasonic flaw detecting method and apparatus |
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| JP2001004602A (en) * | 1999-06-16 | 2001-01-12 | Sumitomo Metal Ind Ltd | Ultrasonic flaw detecting method and apparatus |
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