CN116660377A - An ultrasonic C-scan testing equipment for the curved surface of an adaptive disk ring - Google Patents

Abstract

The invention discloses an ultrasonic C-scan detection device for the curved surface of an adaptive disc ring, which includes an adaptive curved surface C-scan detection system and a scanning detection structure. The scanning detection structure includes a water tank, a scanning device frame and a motion adjustment mechanism. The curved surface C-scan detection system conducts pre-scanning on the curved surface of the disk and ring to perform three-dimensional reconstruction on the surface of the disk and ring. According to the reconstruction results, the system can automatically plan the scanning path and adhere Fully automatic detection of joint structures.

Description

An ultrasonic C-scan testing equipment for the curved surface of an adaptive disk ring

technical field

The invention relates to the technical field of ultrasonic testing, in particular to an ultrasonic C-scan testing device for adapting to the curved surface of a disk ring.

Background technique

As one of the most demanding and important parts in various rocket or missile engines, the ring-disk has extensive and important strategic needs in the national defense and aerospace industries.

With the improvement of engine performance, the working environment of each engine component is also more severe, which also increases the reliability requirements of each engine component. In addition, in order to protect the disc ring from high-temperature air flow erosion and cause structural failure, a thermal barrier coating is generally applied to the curved surface of the disc ring in contact with the high-temperature air flow to protect the disc ring. However, the coating on the disc ring is bonded to the metal surface of the disc ring by bonding process. During the production process, due to the flaws in the production process, the thermal barrier coating is easily debonded from the metal surface of the disc ring. , resulting in the failure of the thermal barrier coating and the ablation of the disk ring, threatening the operation safety of the engine. The existing C-scan detection method needs to manually measure the surface information of the disc ring, reconstruct the surface function, and then manually plan the scanning path according to the obtained surface information to ensure that the received energy amplitude of each sampling point is the largest. In this way, it is necessary to manually reconstruct the surface function during the detection of disc ring parts of different specifications, which leads to a large workload and low detection efficiency.

Therefore, it is very necessary to develop a set of equipment that can adapt to different curved surfaces of disc and ring parts and effectively detect the debonding defects of the thermal barrier coating of disc and ring parts. The detection equipment developed in this invention can adapt to disk rings with different curvatures, automatically plan the scanning path, and improve the detection efficiency.

Contents of the invention

The purpose of the present invention is to solve the technical problems existing in the prior art, and provide an ultrasonic C-scan detection device that adapts to the curved surface of the disc ring.

In order to achieve the above object, the technical solution provided by the present invention is: an ultrasonic C-scan detection equipment for the curved surface of an adaptive disc ring, including an adaptive curved surface C-scan detection system and a scanning detection structure, and the scanning detection structure includes a water tank, a scanning Device frame and motion adjustment mechanism, a positioning chuck is arranged in the water tank, a reducer is arranged on the outer bottom of the water tank, a water tank turntable is arranged on the reducer, and the water tank turntable is connected to the positioning card through eight fastening screws The discs are rigidly connected, and the motion adjustment mechanism includes an X-axis module rigidly connected to the scanning device frame through fastening screws. The X-axis module is slidably connected to an X-axis slider, and the X-axis slider The Y-axis module is rigidly connected with the Y-axis module through the positioning pin and the fastening screw. The Y-axis slider is slidably connected with the Y-axis slider. The Y-axis slider is rigidly connected with the Z-axis module through the positioning pin and the fastening screw. The Z-axis module is slidably connected with a Z-axis slider, and the Z-axis slider is rigidly connected with a probe fixture through fastening screws and positioning pins. The upper end of the probe fixture is provided with a double swing angle adjustment mechanism. The double swing angle adjustment mechanism includes a swing turntable, on which a rotating shaft and a driving pulley engaged with the rotating shaft are arranged, and an ultrasonic probe is arranged on the lower end of the probe fixture through a driven pulley.

Preferably, the motion adjustment mechanism is configured with six motion coordinate axes of X, Y, Z, U, A, and B, including: the X-axis slider drives the longitudinal translation of the Y-axis module on the water tank That is, it moves in the X direction; the Y-axis slider drives the Z-axis module to move laterally, that is, the Y direction; the Z-axis slider drives the probe fixture to move up and down, that is, the Z direction movement; the probe fixture drives the The ultrasonic probe and the oscillating turntable rotate around the vertical axis, that is, move in the direction A; the probe fixture drives the ultrasonic probe to rotate around the horizontal axis, that is, move in the B direction; the water tank turntable drives the positioning chuck to rotate, that is, move in the U direction; automatic scanning , the motion adjustment mechanism can realize multi-axis linkage of X, Y, Z, U swing angle A and turntable B.

Preferably, an electrical installation cabinet is rigidly connected to the frame of the scanning device through fastening screws.

Preferably, the adaptive curved surface C-scan detection system includes an industrial computer, a pulse generator and a servo motor, a signal acquisition card and a motion control card are inserted into the industrial computer, and the adaptive curved surface C-scan detection system uses a curved interface digital In the reconstruction method, by controlling the industrial computer to control the ultrasonic probe to move along the tangent line of the curved interface of the disc ring, the signal acquisition card collects the ultrasonic signal according to the specified step length and calculates the sampling points. When the signal is lost, it calculates the The deflection angle of the ultrasonic probe, after the deflection of the ultrasonic probe is completed, if the signal of the ultrasonic probe recovers, continue to move along the tangent line of the interface until the signal is completely lost, and repeat the above steps; If it is not recovered, the profiling sampling ends, and finally the predicted surface trend is calculated through all known points.

Preferably, the scanning detection steps of the adaptive curved surface C-scan detection system are as follows:

Step 1: Turn on the self-adaptive curved surface C-scan detection system, place the disk ring to be detected on the positioning chuck on the turntable of the water tank, and fill the water tank with water as a coupling agent;

Step 2: Select two-dimensional profiling on the operation interface of the industrial computer, move the ultrasonic probe to the top of the curved surface of the disc ring, fine-tune the distance between the ultrasonic probe and the top of the curved surface, and make the ultrasonic probe perpendicular to the sampling surface point to maximize the echo amplitude, and use this as the starting point of the profiling scan to start profiling;

Step 3: After the profiling is finished, set the scanning speed and profiling step length scanning parameters, and the adaptive surface C-scan detection system automatically generates a scanning path according to profiling data and scanning parameter settings;

Step 4: Click to start detection, and the ultrasonic probe will automatically move to the starting point of the profiling scan, which is used as the starting point of the scan. The ultrasonic probe will move to the next sampling position along the curved surface every time it completes a round of sampling on the curved surface until the scanning After checking the entire curved surface of the ring, the industrial computer will automatically save the scanning data of the ring for data processing and viewing.

Preferably, the sampling position spacing in step 4 can be set by itself.

Beneficial effects of the present invention:

1. The present invention can perform three-dimensional profiling to reconstruct the surface function of the disk and ring with unknown model parameters, and then automatically set the scanning path according to the reconstruction result, and perform fully automatic bonding structure of the thermal barrier coating on the curved surface of the disk and ring. The detection improves the detection efficiency of the debonding defect of the thermal barrier coating on the curved surface of the disc and ring, and reduces the detection cost.

2. The present invention can adapt to different types of disk ring parts, and can perform rapid three-dimensional profiling reconstruction on them, so that different types of disk ring parts can be detected, greatly improving detection efficiency, reducing labor costs, and meeting the requirements of The requirements put forward by relevant industrial departments are more versatile.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute improper limitations to the present invention.

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is a structural representation of the X-axis module of the present invention:

Fig. 3 is the structural representation of Y-axis module and motor of the present invention;

Fig. 4 is a structural schematic diagram of a Z-axis module and a motor of the present invention;

Fig. 5 is a schematic diagram of the X, Y, Z direction movement of the movement adjustment mechanism during automatic scanning of the present invention;

Fig. 6 is a schematic diagram of the movement of the movement adjustment mechanism in the U direction during the automatic scanning of the present invention;

Fig. 7 is a schematic diagram of the movement of the movement adjustment mechanism in directions A and B during automatic scanning of the present invention;

Fig. 8 is a schematic diagram of the connection between the water tank turntable, the positioning chuck and the water tank of the present invention;

Fig. 9 is profiling flowchart of the present invention;

Fig. 10 is the automatic detection flowchart of the present invention

Fig. 11 is the amplitude imaging diagram of the curved surface of the disk ring in embodiment 1 of the present invention

Fig. 12 is an overall system diagram of the present invention.

Notes on drawings:

1-scanning device frame, 2-reducer, 3-water tank, 4-X-axis module, 5-probe fixture, 6-Z-axis module, 7-Y-axis module, 8-electrical installation cabinet, 9-X Axis slider, 10-servo motor, 11-rotation axis, 12-Y-axis slider, 14-Z-axis slider, 15-positioning chuck, 16-swing turntable, 17-central shaft, 18-ultrasonic probe.

Detailed ways

This part will describe the specific embodiment of the present invention in detail, and the preferred embodiment of the present invention is shown in the accompanying drawings. Each technical feature and overall technical solution of the invention, but it should not be understood as a limitation on the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc. indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, several means one or more, and multiple means more than two. Greater than, less than, exceeding, etc. are understood as not including the original number, and above, below, within, etc. are understood as including the original number. If the description of the first and second is only for the purpose of distinguishing the technical features, it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features relation.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

Referring to Fig. 1-Fig. 8, a preferred embodiment of the present invention, an ultrasonic C-scan detection device for an adaptive curved surface of a disk ring, includes an adaptive curved surface C-scan detection system and a scanning detection structure, and the scanning detection structure includes a water tank 3 , the scanning device frame 1 and the motion adjustment mechanism, the positioning chuck 15 is set in the water tank 3, the speed reducer 2 is arranged on the outer bottom of the water tank 3, and the water tank turntable is arranged on the speed reducer 2, and the water tank turntable passes through eight A fastening screw is rigidly connected to the positioning chuck 15, and the motion adjustment mechanism includes an X-axis module 4 rigidly connected to the scanning device frame 1 by a fastening screw, and the X-axis module 4 slides An X-axis slider 9 is connected, specifically, the X-axis module 4 is provided with a screw, and the X-axis slider 9 is arranged on the screw, and the X-axis slider 9 is rigidly fixed by positioning pins and fastening screws A Y-axis module 7 is connected, and a Y-axis slider 12 is slidably connected to the Y-axis module 7. Specifically, the Y-axis module 7 is provided with a screw, and the Y-axis slider 12 is arranged on the screw , the Y-axis slider 12 is rigidly connected to the Z-axis module 6 through positioning pins and fastening screws, and the Z-axis module 6 is slidably connected to the Z-axis slider 14. Specifically, the Z-axis module 6 is provided with a lead screw, and the Z-axis slider 14 is arranged on the lead screw. The Z-axis slider 14 is rigidly connected to the probe fixture 5 through fastening screws and positioning pins. The upper end of the probe fixture 5 is provided with a double swing angle The adjustment mechanism, the double swing angle adjustment mechanism includes a swing turntable 16, the swing turntable 16 is provided with a rotating shaft 11 and a driving pulley engaged with the rotating shaft 11, and the lower end of the probe holder 5 is set by a driven pulley There is an ultrasonic probe 18, the driven pulley is fixed on the lower end of the probe holder 5 through the central rotating shaft 17, and the driving pulley is linked with the driven pulley.

The linkage between the driving pulley and the driven pulley is a conventional technical means in this technical field, because it is not described in detail, it is not shown in Fig. 7 .

In this embodiment, the motion adjustment mechanism is configured with six motion coordinate axes of X, Y, Z, U, A, and B, including: the X-axis slider 9 drives the Y-axis module 7 on the water tank 3 The longitudinal translation of the X-axis is the movement in the X direction; the Y-axis slider 12 drives the Z-axis module 6 to move laterally in the Y direction; the Z-axis slider 14 drives the probe fixture 5 to move up and down, that is, the Z-direction movement; The probe fixture 5 drives the ultrasonic probe 18 to rotate around the vertical axis, that is, to move in the A direction; the probe fixture 5 drives the ultrasonic probe 18 to rotate around the horizontal axis, that is, to move in the B direction, and the water tank turntable drives the positioning chuck 15 to rotate That is, movement in the U direction; during automatic scanning, the movement adjustment mechanism can realize multi-axis linkage of X, Y, Z, U swing angle A and turntable B.

In this embodiment, an electrical installation cabinet 8 is rigidly connected to the scanning device frame 1 through fastening screws, and an accommodating cavity for placing a water tank 3 is provided in the scanning device frame 1 .

9-12, in this embodiment, the adaptive curved surface C-scan detection system includes an industrial computer, a pulse generator and a servo motor 10,

The pulse generator is used to generate an excitation signal of the ultrasonic probe 18, so that the ultrasonic probe 18 emits ultrasonic waves of a specific frequency;

There are 6 servo motors 10 in total, which are used to output power to the scanning detection structure, including the X-axis slider 9, the Y-axis slider 12, and the Z-axis slider 14 connected with the lead screw, and the servo motor 10 drives the lead screw to rotate, and then Drive the X-axis slider 9, Y-axis slider 12, and Z-axis slider 14 on the screw to move linearly along the screw; in the U direction, the servo motor 10 is connected to the input end of the reducer 2, and the reducer 2 drives the water tank The turntable rotates; in the A and B directions, the servo motor 10 is connected to the rotating shaft 11, and the rotating shaft 11 is connected to the synchronous pulley, and the rotational torque is transmitted to the A and B directions after being decelerated by the synchronous pulley.

A signal acquisition card and a motion control card are inserted into the industrial computer, and the adaptive curved surface C-scan detection system adopts a curved interface digital reconstruction method, by controlling the industrial computer to control the ultrasonic probe 18 to move along the tangent line of the curved interface of the ring part. The signal acquisition card collects the ultrasonic signal according to the specified step length and calculates the sampling point. When the signal is lost, the ultrasonic probe 18 offset angle is calculated according to the known point. After the ultrasonic probe 18 completes the deflection, if the ultrasonic probe 18 signal recovery, then continue to move along the tangent line of the interface until the signal is completely lost, and repeat the above steps; if the signal has not recovered after the deflection of the ultrasonic probe 18, the profiling sampling ends, and finally the predicted surface is calculated through all known points towards.

Specifically, the digital reconstruction method of the curved interface is specifically to establish a world coordinate system, through the reflected echo signal of the sampling point, inversely solve the position of each sampling point on the world coordinate system, and then fit the relationship through a series of points Surface function, so as to realize the three-dimensional reconstruction of the surface.

In this embodiment, the scanning detection steps of the adaptive curved surface C-scan detection system are as follows:

Step 1: Turn on the self-adaptive curved surface C-scan detection system, place the disk ring to be detected on the positioning chuck 15 on the turntable of the water tank, and fill the water tank 3 with water as a coupling agent;

Step 2: Select two-dimensional profiling on the operation interface of the industrial computer, move the ultrasonic probe 18 to the top of the curved surface of the disc ring, fine-tune the distance between the ultrasonic probe 18 and the top of the curved surface, and make the ultrasonic probe 18 Vertical to the sampling point, so that the echo amplitude is the largest, and use this as the starting point of the profiling scanning, and start profiling;

Step 3: After the profiling is finished, set the scanning speed and profiling step length scanning parameters, and the adaptive surface C-scan detection system automatically generates a scanning path according to profiling data and scanning parameter settings;

Step 4: click to start detection, and the ultrasonic probe 18 will move to the profiling scanning starting point by itself, and use this as the scanning starting point, and the ultrasonic probe 18 will move to the next sampling position along the curved surface every time the sampling of the curved surface is completed for one week ( The distance between the sampling positions can be set by yourself), until the entire curved surface of the ring is scanned, the industrial computer will automatically save the scanning data of the ring for data processing and viewing.

Specifically, the scanning method of step 4 is that the ultrasonic probe 18 will move according to the scanning path planned by the industrial computer, and at each sampling position, it can be ensured that the ultrasonic probe 18 is perpendicular to the curved surface and the distance between the ultrasonic probe 18 and the curved surface is just right. is the focal length of the ultrasonic probe 18; after the ultrasonic probe 18 arrives at the sampling position, the water tank turntable will drive the disc ring to rotate one circle to complete the sampling of the curved surface for one circle. sampling location.

The present invention can carry out three-dimensional profiling to reconstruct the surface function of the disk ring with unknown model parameters, and then automatically set the scanning path according to the reconstruction result, and carry out automatic detection of the thermal barrier coating bonding structure on the curved surface of the disk ring, The detection efficiency of the debonding defect of the thermal barrier coating on the curved surface of the disk ring is improved, and the detection cost is reduced; moreover, the invention can adapt to different types of disk rings, and can perform rapid three-dimensional profiling reconstruction on them, so that It can detect different types of disk rings, which greatly improves the detection efficiency, reduces labor costs, meets the requirements of relevant industrial departments, and has stronger versatility.

Example 1

Due to the particularity of the detection of debonding defects of the thermal barrier coating of disc and ring parts, there is no need for comparison test blocks for precision adjustment in the detection. Debonding defects can be judged through the C-scan imaging results and A-scan waveforms of the disc ring.

The following is the detection of a certain type of disk ring.

(1) Using the American Olympus water immersion focusing probe, its parameters are: frequency: 10MHz, chip diameter is 10mm, probe diameter is 19mm, length is 90mm, focal length is 12.5mm;

(2) Select a certain type of disc ring, whose outer diameter is 216mm, inner diameter is 85mm, and height is 45mm. Fix the disc ring on the positioning chuck 15 in the water tank 3, and fill the water tank 3 with water;

(3) Turn on the industrial computer, confirm that the industrial computer is normal, select two-dimensional profiling on the operation interface, move the ultrasonic probe 18 to the top of the curved surface of the ring, fine-tune the distance between the ultrasonic probe 18 and the top of the curved surface, and make the ultrasonic probe 18 Vertical to the sampling point, make the echo amplitude the largest, take this as the starting point of the profiling scan, and adjust the gain value of the pulse generator at the same time, so that the height of the first bottom wave is 80% of the wave height, and use this gain value as the scan Gain in process, start profiling;

(4) After the profiling is finished, the industrial computer will automatically generate the surface function on the operation interface, and adjust the sampling step and scanning speed (such as scanning parameters) on the scanning interface. The sampling step is set to 1°, and the scanning speed is set to 20°/s, the industrial computer will automatically plan the scanning path according to the set scanning parameters;

(5) Click to start flaw detection, and the ultrasonic probe 18 will automatically move to the starting point of the profiling scan, which is used as the starting point of the scan. The ultrasonic probe 18 will move to the next sampling position along the curved surface every time it completes a round of sampling on the curved surface until the scanning is completed. The entire curved surface of the ring is displayed on the display screen of the industrial computer, and the C-scan circumference expansion diagram of the curved surface of the ring is displayed, and the A-scan waveform of any point can be displayed in real time on the software interface;

(6) After the scan is completed, click Save, and the industrial computer will automatically save the scan data of the coil and ring for data processing and viewing; at this time, the scan results can be processed, and multiple imaging methods can be used to comprehensively judge whether there are defects.

Referring to Fig. 11, it is an imaging diagram of the curved surface of this type of disc ring part. The echo of the well bonded part is high, which is displayed in gray, and there is no echo in the weakly bonded part, which is displayed in black, which shows that the method used in the present invention has no effect on the curved surface of the disc ring part and the heat. The barrier-coated interface enables reliable and efficient detection.

On the premise of no conflict, those skilled in the art can freely combine and superimpose the above additional technical features.

The above descriptions are only the preferred implementation modes of the present invention, as long as the technical solutions to achieve the purpose of the present invention by basically the same means fall within the scope of protection of the present invention.

Claims (6)

1. An ultrasonic C scanning detection device of self-adaptation disc ring curved surface, its characterized in that: including self-adaptation curved surface C scanning detecting system and scanning detection structure, the scanning detection structure includes basin (3), scanning device frame (1) and motion adjustment mechanism, set up positioning chuck (15) in basin (3), the bottom is provided with speed reducer (2) outside basin (3), be provided with basin revolving stage on speed reducer (2), the basin revolving stage pass through eight fastening screw with positioning chuck (15) rigid connection, motion adjustment mechanism includes X axle module (4) on scanning device frame (1) through fastening screw rigid connection, sliding connection has X axle slider (9) on X axle module (4), there is Y axle module (7) on X axle slider (9) through locating pin and fastening screw rigid connection, sliding connection has Y axle slider (12) on Y axle module (7), Y axle slider (12) are through locating pin and fastening screw rigid connection have Z axle module (6), sliding connection has Z axle slider (14) on Z axle module (6), Z axle slider (14) are through fastening screw rigid connection X axle slider (9) have Y axle slider (6) through locating pin and fastening screw rigid connection, swing angle adjustment mechanism (16) are provided with on swing angle probe (5), the swing turntable (16) is provided with a rotating shaft (11) and a driving belt pulley meshed with the rotating shaft (11), and the lower end of the probe clamp (5) is provided with an ultrasonic probe (18) through a driven belt pulley.

2. An ultrasonic C-scan inspection apparatus for an adaptive disc annulus curvature as defined in claim 1, wherein: the motion adjustment mechanism configuration X, Y, Z, U, A, B includes 6 motion coordinate axes: the X-axis sliding block (9) drives the Y-axis module (7) to move in the X direction, namely, the longitudinal translation of the Y-axis module on the water tank (3); the Y-axis sliding block (12) drives the Z-axis module (6) to transversely translate, namely move in the Y direction; the Z-axis sliding block (14) drives the probe clamp (5) to move up and down, namely, move in the Z direction; the probe clamp (5) drives the ultrasonic probe (18) and the swinging turntable (16) to rotate around a vertical axis, namely, move in the direction A; the probe clamp (5) drives the ultrasonic probe (18) to rotate around a horizontal shaft, namely, move in the direction B, and the water tank turntable drives the positioning chuck (15) to rotate, namely, move in the direction U; during automatic scanning, the motion adjusting mechanism can realize multi-axis linkage of the X, Y, Z, U swing angle A and the turntable B.

3. An ultrasonic C-scan inspection apparatus for an adaptive disc annulus curvature as defined in claim 1, wherein: the scanning device frame (1) is rigidly connected with an electric installation cabinet (8) through fastening screws.

4. An ultrasonic C-scan inspection apparatus for an adaptive disc annulus curvature as defined in claim 1, wherein: the self-adaptive curved surface C scanning detection system comprises an industrial personal computer, a pulse generator and a servo motor (10), wherein a signal acquisition card and a motion control card are inserted into the industrial personal computer, the self-adaptive curved surface C scanning detection system adopts a curved interface digital reconstruction method, the ultrasonic probe (18) is controlled by the control industrial personal computer to move along a curved interface tangent line of a disc ring piece, the signal acquisition card acquires ultrasonic signals according to a specified step length and calculates sampling points, when the signals are lost, the offset angle of the ultrasonic probe (18) is calculated according to known points, after the ultrasonic probe (18) finishes deflection, if the signals of the ultrasonic probe (18) are recovered, the ultrasonic probe continues to move along the interface tangent line until the signals are completely lost, and the steps are repeated; if the signal is not recovered after the deflection of the ultrasonic probe (18), the profiling sampling is finished, and finally the predicted curve trend is calculated through all known points.

5. An ultrasonic C-scan inspection apparatus for an adaptive disc annulus curvature as defined in claim 4, wherein: the scanning detection steps of the self-adaptive curved surface C scanning detection system are as follows:

step 1: opening the self-adaptive curved surface C scanning detection system, placing a disc ring to be detected on the positioning chuck (15) on the water tank turntable, and filling water in the water tank (3) as a coupling agent;

step 2: selecting two-dimensional profiling on an operation interface of the industrial personal computer, moving the ultrasonic probe (18) to the top of the curved surface of the disc ring, finely adjusting the distance between the ultrasonic probe (18) and the top of the curved surface, enabling the ultrasonic probe (18) to be perpendicular to a sampling point, enabling the amplitude of an echo to be maximum, taking the amplitude as a profiling scanning starting point, and starting profiling;

step 3: after profiling, setting scanning speed and profiling step scanning parameters, wherein the self-adaptive curved surface C scanning detection system automatically generates a scanning path according to profiling data and scanning parameter settings;

step 4: the detection is started by clicking, the ultrasonic probe (18) automatically moves to a profiling scanning starting point to serve as a scanning starting point, the ultrasonic probe (18) moves to the next sampling position along the curved surface every time the curved surface is sampled for one circle until the curved surface is scanned completely, and the industrial personal computer automatically stores scanning data of the ring-shaped plate for data processing and viewing.

6. An ultrasonic C-scan inspection apparatus for an adaptive disc annulus curvature as defined in claim 5, wherein: the sampling position interval in the step 4 can be set by oneself.