Ultrasonic profiling automatic detection method and system for composite material part

Abstract

The invention discloses an ultrasonic profiling automatic detection method and system for a composite material workpiece. Aiming at the complex structure and defect type of the blade body part of the composite material outer duct stator blade, in order to make up for the defects of a manual detection technology, an ultrasonic profiling automatic detection method is adopted, a profiling automatic detection system matched with the method is matched, and an automatic scanning imaging technology is adopted to detect the defects of the blade body part of the composite material outer duct stator blade. And an ultrasonic signal abnormal area in the product is accurately identified and positioned. And aiming at the abnormal region, evaluating the abnormal region by using an ultrasonic single-probe reflection method. Compared with a waveform signal displayed by an ultrasonic flaw detector during manual detection, the detection result of the method is stored in a computer in an image form and can be traced; the automatic detection method can improve the reliability and consistency of detection.

Description

Technical Field

[0001] The invention relates to an ultrasonic profiling automatic detection method and system for composite material parts, in particular to an ultrasonic profiling automatic detection method and system for composite material outer duct stator blades, belonging to the field of ultrasonic non-destructive testing. Background Art

[0002] Composite materials for aircraft engine blades can not only further improve thrust-to-weight ratio and fuel efficiency, reduce noise and harmful gas emissions, but also effectively reduce mass, improve bypass ratio, specific stiffness, fatigue performance, damage and defect tolerance, etc., and have become one of the development directions of modern aircraft engines. Due to the particularity of the manufacturing process, defects may occur inside the composite material during the molding, curing and use process, which in turn affects the performance of the composite material parts. During the development and production process, the internal quality of the composite blade must be effectively tested.

[0003] Composite material outer duct stator blades are prone to defects such as delamination, dense pores, and looseness during production and use. Ultrasonic non-destructive testing methods are more sensitive to such area defects, and have the advantages of high sensitivity, no radiation, no pollution, and easy operation. The blade part of the outer duct stator blade of an aircraft engine is a variable curvature and variable thickness structure. During manual inspection, defect identification is difficult and easily affected by human factors, which puts forward new requirements for ultrasonic non-destructive testing. Therefore, there is an urgent need for an ultrasonic profiling automatic detection method and a corresponding automatic detection system suitable for this special structure. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art and to provide an ultrasonic profiling automatic detection method and system for composite material parts, so as to identify and locate abnormal ultrasonic signal areas inside the product.

[0005] The technical solution of the present invention is:

[0006] The present invention discloses an ultrasonic profiling automatic detection system for composite material outer duct stator blades, comprising: an ultrasonic flaw detector, an ultrasonic probe, a mechanical scanning device, a water tank, a probe bracket, a product tooling, a computer and a detection module; wherein:

[0007] An ultrasonic flaw detector is connected to an ultrasonic probe; the ultrasonic probe detects the object to be inspected to form an ultrasonic signal;

[0008] The ultrasonic probe is placed at the end of the probe holder;

[0009] The probe bracket is mounted on the end of the mechanical scanning device and moves with the movement of the mechanical scanning device;

[0010] Product tooling, placed at the bottom of the sink, used to install the parts to be tested;

[0011] A water tank for holding deionized water;

[0012] The computer collects the ultrasonic signal in real time and sends it to the detection module;

[0013] The detection module is installed in the computer and is used to input the profiling scanning trajectory; control the movement of the mechanical scanning device according to the profiling scanning trajectory; perform profiling scanning imaging according to the ultrasonic signal to generate an image; and identify the abnormal area according to the image.

[0014] Furthermore, in the above system, the ultrasonic flaw detector has a gain adjustment function and a gate signal peak output function.

[0015] Furthermore, in the above system, the ultrasonic probe includes a transmitting probe and a receiving probe; the probe type is a water-immersed flat probe or a focusing probe; during detection, the transmitting probe, the receiving probe and the detection area of ​​the product to be detected are completely immersed in the deionized water of the sink.

[0016] Furthermore, in the above system, the mechanical scanning device has at least three translational degrees of freedom and two rotational degrees of freedom, and the motion range covers the blade body of the stator blade; the ultrasonic probe can perform contour scanning on the object to be inspected with the set trajectory, scanning speed, and scanning spacing; and it has a manual emergency stop switch.

[0017] Furthermore, in the above system, the end positioning accuracy of the mechanical scanning device is better than 1 / 60 of the maximum allowable defect size, and the minimum scanning interval is no more than 1 / 3 of the maximum allowable defect size.

[0018] Furthermore, in the above system, the probe bracket keeps the relative position and posture of the transmitting probe and the receiving probe unchanged during the detection process;

[0019] The present invention discloses an automatic ultrasonic profiling detection method for composite material outer duct stator blades, comprising:

[0020] S1. Using composite material outer duct stator blades with artificial pre-embedded delamination defect specimens, determine the detection sensitivity of the ultrasonic profiling automatic detection system;

[0021] S2. Use an ultrasonic profiling automatic detection system to detect the blade body part of the composite material outer duct stator blade;

[0022] S3, determine whether the inspection task is completed, if so, proceed to step S4; if not, determine whether the number of inspections exceeds the predetermined number of times or whether the time for inspecting batch products exceeds the predetermined time, if so, proceed to step S4, if not, inspect the next product and proceed to step S2;

[0023] S4. Determine whether the sensitivity meets the requirements. If not, perform equipment inspection and calibration, re-test all products that have passed the last sensitivity inspection, and then proceed to step S2. If yes, determine whether the task is completed. If not, proceed to step S2. If yes, the test is completed.

[0024] Furthermore, in the above method, the artificial pre-embedded delamination defect specimen of the composite material outer duct stator blade should meet the following conditions:

[0025] a. The material, ply form, thickness variation and curvature variation of the specimen are consistent with the blade body of the actual composite material outer duct stator blade, and can represent the sound attenuation characteristics of the blade body of the stator blade; the thickness deviation of the specimen shall not exceed 10%, and the curvature deviation shall not exceed 10%;

[0026] b. The sample should contain at least two artificial embedded defects of different sizes, and neither size should be larger than the maximum allowable defect size;

[0027] c. The spacing between artificial pre-embedded defects shall not be less than the maximum allowable defect size, and the distance between artificial pre-embedded defects and the edge of the specimen shall not be less than the maximum allowable defect size;

[0028] d. The buried depth of artificial pre-embedded defects of each size shall include at least three different depths;

[0029] e. Use single or multiple layers of sound-impermeable materials as artificial pre-embedded defects, with the maximum thickness of a single layer not exceeding 0.15mm;

[0030] f. There are no natural defects within the maximum allowable defect size range around the artificial embedded defects.

[0031] Furthermore, in the above method, the detection sensitivity of the ultrasonic profiling automatic detection system is determined by:

[0032] An artificial pre-embedded defect is placed in the composite material outer duct stator blade to generate a test specimen;

[0033] Place the sample on the product fixture fixed in the water tank, and inject an appropriate amount of deionized water into the water tank to make the sample completely immersed in the water;

[0034] Place the transmitting probe and receiving probe on both sides of the sample, and adjust the gain of the ultrasonic flaw detector so that the amplitude of the penetrating wave signal in the area without embedded defects in the sample reaches 70% to 85% of the full screen of the ultrasonic flaw detector;

[0035] Set the scanning interval to no more than 1 / 3 of the maximum allowable defect size;

[0036] Increase the gain of the ultrasonic flaw detector and start the detection module to perform profiling scanning and imaging;

[0037] After the scanning is completed, the flaw detector gain is adjusted according to the size of the abnormal area identified by the detection module, and the profiling scanning imaging is started again until the deviation between the size of the abnormal area of ​​the ultrasonic signal corresponding to the artificial pre-embedded defect and its actual size does not exceed 25%;

[0038] The decibel value of the current flaw detector gain is recorded, which is the detection sensitivity of the blade body of the composite material outer duct stator blade.

[0039] Furthermore, in the above method, whether the sensitivity meets the requirements is determined as follows:

[0040] Measure the deviation between the size of the abnormal area of ​​the ultrasonic signal corresponding to the artificial pre-buried defect and its actual size;

[0041] If the deviation does not exceed 25%, the sensitivity meets the requirements;

[0042] If the deviation exceeds 25% and does not exceed 50%, fine-tune the flaw detector gain appropriately and start the automatic scanning imaging function again until the deviation does not exceed 25%. Record the decibel value of the current flaw detector gain as the recalibrated detection sensitivity. The recalibrated detection sensitivity meets the requirements.

[0043] If the deviation exceeds 50%, the sensitivity does not meet the requirements.

[0044] The beneficial effects of the present invention and the prior art are:

[0045] (1) The present invention adopts an ultrasonic profiling automatic detection method, cooperates with an automatic profiling detection system compatible with the method, and uses automatic scanning imaging technology to achieve accurate identification and positioning of abnormal ultrasonic signal areas inside the product, avoids the influence of human factors on defect identification during manual detection, and improves the reliability and consistency of detection.

[0046] (2) The present invention adopts an automatic detection system to generate an internal quality image of the product, realizes digital storage of the detection results, and solves the problem that the waveform signal displayed by the ultrasonic flaw detector during manual detection cannot be saved and traced.

[0047] (3) The present invention uses an automated testing system to test the product, thereby realizing automated testing of composite material outer duct stator blades and avoiding the problem of reduced efficiency due to fatigue of test personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the structure of the composite material outer duct stator blade;

[0049] Figure 2 It is a schematic diagram of defect distribution of a composite material outer duct stator blade of the present invention in equal proportion with artificial pre-embedded delamination defect specimen;

[0050] Figure 3 It is a schematic diagram of an ultrasonic profiling automatic detection system;

[0051] Figure 4 The abnormal area recognition result of the ultrasonic signal of the artificial pre-buried delamination defect sample of the present invention;

[0052] Figure 5 The abnormal area recognition result of the ultrasonic signal of the defect-free product of the present invention;

[0053] Figure 6 This is the abnormal area identification result of the ultrasonic signal of the defective product of the present invention. DETAILED DESCRIPTION

[0054] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0055] During the production and use of composite material outer duct stator blades, defects such as stratification, dense pores, and looseness are prone to occur. The blade body part has a variable curvature and variable thickness structure. During manual inspection, it is difficult to identify defects and is easily affected by human factors, which puts forward new requirements for ultrasonic non-destructive testing. In view of the complex structure and defect types of the blade body part of the composite material outer duct stator blade, in order to make up for the shortcomings of manual inspection technology, the present invention adopts an ultrasonic profiling automatic detection method, cooperates with a profiling automatic detection system adapted to the method, and accurately identifies and locates abnormal areas of ultrasonic signals inside the product through automatic scanning imaging technology. For abnormal areas, the ultrasonic single probe reflection method is used to evaluate them. Compared with the waveform signal displayed by the ultrasonic flaw detector during manual inspection, the detection results of this method are saved in the computer in the form of images and can be traced; the automatic detection method can improve the reliability and consistency of detection.

[0056] The present invention discloses an ultrasonic profiling automatic detection system for composite material outer duct stator blades, comprising: an ultrasonic flaw detector 1, an ultrasonic probe 2, a mechanical scanning device 3, a water tank 4, a probe bracket 5, a product tooling 6, a computer 7 and a detection module 8; wherein,

[0057] The ultrasonic flaw detector 1 is connected to the ultrasonic probe 2; the ultrasonic probe 2 detects the object to be detected to form an ultrasonic signal;

[0058] The ultrasonic probe 2 is placed at the end of the probe bracket 5;

[0059] The probe bracket 5 is installed at the end of the mechanical scanning device 3 and moves with the movement of the mechanical scanning device 3;

[0060] Product tooling 6, placed at the bottom of the water tank 4, for mounting the part to be tested;

[0061] A water tank 4, used for holding deionized water;

[0062] Computer 7 collects ultrasonic signals in real time and sends them to detection module 8;

[0063] The detection module 8 is installed in the computer 7 and is used to input the profiling scanning trajectory; control the movement of the mechanical scanning device 3 according to the profiling scanning trajectory; perform profiling scanning imaging according to the ultrasonic signal to generate an image; and identify the abnormal area according to the image.

[0064] Preferably, the ultrasonic flaw detector 1 has a gain adjustment function and a gate signal peak output function.

[0065] Preferably, the ultrasonic probe 2 includes a transmitting probe and a receiving probe; the probe type is a water-immersed flat probe or a focusing probe; during detection, the transmitting probe, the receiving probe and the detection area of ​​the product to be detected are completely immersed in the deionized water of the water tank 4.

[0066] Preferably, the mechanical scanning device 3 has at least three translational degrees of freedom and two rotational degrees of freedom, and the range of motion covers the blade body of the stator blade; the ultrasonic probe 2 performs contour scanning on the object to be inspected with a set trajectory, scanning speed, and scanning interval; and has a manual emergency stop switch.

[0067] Preferably, the end positioning accuracy of the mechanical scanning device 3 is better than 1 / 60 of the maximum allowable defect size, and the minimum scanning interval is no more than 1 / 3 of the maximum allowable defect size.

[0068] Preferably, the probe bracket 5 keeps the relative position and posture of the transmitting probe and the receiving probe unchanged during the detection process;

[0069] The present invention discloses an automatic ultrasonic profiling detection method for composite material outer duct stator blades, comprising:

[0070] S1. Using composite material outer duct stator blades with artificial pre-embedded delamination defect specimens, determine the detection sensitivity of the ultrasonic profiling automatic detection system;

[0071] S2. Use an ultrasonic profiling automatic detection system to detect the blade body part of the composite material outer duct stator blade;

[0072] S3, determine whether the inspection task is completed, if so, proceed to step S4; if not, determine whether the number of inspections exceeds the predetermined number of times or whether the time for inspecting batch products exceeds the predetermined time, if so, proceed to step S4, if not, inspect the next product and proceed to step S2;

[0073] S4. Determine whether the sensitivity meets the requirements. If not, perform equipment inspection and calibration, re-test all products that have passed the last sensitivity inspection, and then proceed to step S2. If yes, determine whether the task is completed. If not, proceed to step S2. If yes, the test is completed.

[0074] Preferably, the artificial pre-embedded delamination defect specimen of the composite material outer duct stator blade should meet the following conditions:

[0075] a. The material, ply form, thickness variation and curvature variation of the specimen are consistent with the blade body of the actual composite material outer duct stator blade, and can represent the sound attenuation characteristics of the blade body of the stator blade; the thickness deviation of the specimen shall not exceed 10%, and the curvature deviation shall not exceed 10%;

[0076] b. The sample should contain at least two artificial embedded defects of different sizes, and neither size should be larger than the maximum allowable defect size;

[0077] c. The spacing between artificial pre-embedded defects shall not be less than the maximum allowable defect size, and the distance between artificial pre-embedded defects and the edge of the specimen shall not be less than the maximum allowable defect size;

[0078] d. The buried depth of artificial pre-buried defects of each size shall include at least three different depths;

[0079] e. Use single or multiple layers of sound-impermeable materials as artificial pre-embedded defects, with the maximum thickness of a single layer not exceeding 0.15mm;

[0080] f. There are no natural defects within the maximum allowable defect size range around the artificial embedded defects.

[0081] Preferably, the detection sensitivity of the ultrasonic profiling automatic detection system is determined by:

[0082] An artificial pre-embedded defect is placed in the composite material outer duct stator blade to generate a test specimen;

[0083] Place the sample on the product fixture fixed in the water tank, and inject an appropriate amount of deionized water into the water tank to make the sample completely immersed in the water;

[0084] Place the transmitting probe and the receiving probe on both sides of the sample respectively, and adjust the gain of the ultrasonic flaw detector 1 so that the amplitude of the penetrating wave signal in the area without embedded defects in the sample reaches 70% to 85% of the full screen of the display screen of the ultrasonic flaw detector 1;

[0085] Set the scanning interval to no more than 1 / 3 of the maximum allowable defect size;

[0086] Increase the gain of the ultrasonic flaw detector 1 and start the detection module 8 to perform profiling scanning and imaging;

[0087] After the scanning is completed, the flaw detector gain is adjusted according to the size of the abnormal area identified by the detection module, and the profiling scanning imaging is started again until the deviation between the size of the abnormal area of ​​the ultrasonic signal corresponding to the artificial pre-embedded defect and its actual size does not exceed 25%;

[0088] The decibel value of the current flaw detector gain is recorded, which is the detection sensitivity of the blade body of the composite material outer duct stator blade.

[0089] Preferably, whether the sensitivity meets the requirements is determined as follows:

[0090] Measure the deviation between the size of the abnormal area of ​​the ultrasonic signal corresponding to the artificial pre-buried defect and its actual size;

[0091] If the deviation does not exceed 25%, the sensitivity meets the requirements;

[0092] If the deviation exceeds 25% and does not exceed 50%, fine-tune the flaw detector gain appropriately and start the automatic scanning imaging function again until the deviation does not exceed 25%. Record the decibel value of the current flaw detector gain as the recalibrated detection sensitivity. The recalibrated detection sensitivity meets the requirements.

[0093] If the deviation exceeds 50%, the sensitivity does not meet the requirements.

[0094] Example

[0095] The composite material outer duct stator blade in this specific embodiment is composed of a blade body, an inner edge, and an outer edge, and its structure is as follows: Figure 1 The blade body is about 320mm long and 110mm wide. The technical acceptance conditions for this product are: the blade body is not allowed to have stratification, pores or loose defects larger than Φ12mm.

[0096] The same material and the same layer form were used to make the same proportion of artificial pre-embedded delamination defect samples to determine the detection sensitivity of the stator blades. Three sizes of defects, Φ3mm, Φ6mm, and Φ9mm, were pre-embedded respectively. Each defect had three burial depths, near the surface, middle depth, and near the bottom surface. Figure 2 The embedded defect is a double-layer polytetrafluoroethylene film, and the thickness of each layer is 0.15 mm.

[0097] The composite material outer duct stator blade ultrasonic profiling automatic detection method of the present invention is used in conjunction with an ultrasonic profiling automatic detection system (such as Figure 3 The ultrasonic profiling automatic detection system is composed of ultrasonic flaw detector 1, ultrasonic probe 2, mechanical scanning device 3, water tank 4, probe bracket 5, product tooling 6, computer 7, detection module 8 and other main components.

[0098] The Sonatest brand Masterscan 700M ultrasonic flaw detector was selected, which has a transmit-receive function, gain adjustment function and gate signal peak output function.

[0099] Two water-immersion focused ultrasonic probes with a frequency of 5 MHz and a chip diameter of 0.25 in were selected as the transmitting probe and the receiving probe respectively.

[0100] The automatic contour scanning system uses a six-axis industrial robot as a mechanical scanning device. The movement radius of the robot end is greater than 1000mm, which can completely cover the blade part of the stator blade, and the repeated positioning accuracy is 0.1mm.

[0101] The size of the water tank is approximately 1200mm×1000mm×800mm (length×width×height), which can ensure that the transmitting probe, the receiving probe and the blade body of the composite material outer duct stator blade are completely immersed in water.

[0102] Fixing the transmitting probe and the receiving probe at the two ends of the U-shaped probe bracket can ensure that the relative position and posture of the transmitting probe and the receiving probe remain unchanged during the detection process. Fix the U-shaped probe bracket at the end of the robot.

[0103] Place the special product tooling for composite material outer duct stator blades at the specified position in the water tank. The pin holes at the bottom of the product tooling match well with the positioning pins in the water tank to ensure the repeated placement accuracy of the product to be tested.

[0104] A data acquisition card is installed in the computer, which can collect the analog voltage signal output by the ultrasonic flaw detector according to the set rules.

[0105] The detection module is installed in the computer and has the functions of profiling scanning trajectory input, mechanical scanning device motion control, ultrasonic signal real-time acquisition, profiling automatic scanning imaging and ultrasonic signal abnormal area recognition.

[0106] Place the composite material outer duct stator blade artificial pre-embedded defect sample on the product tooling fixed in the water tank, and inject an appropriate amount of deionized water into the water tank so that the sample is completely immersed in the water. Adjust the relative position of the probe and the sample so that the transmitting probe and the receiving probe are placed on both sides of the sample respectively, and adjust the flaw detector gain so that the amplitude of the penetrating wave signal in the sample without pre-embedded defects reaches about 80% of the full screen of the flaw detector display. At this time, the flaw detector gain is 45dB. Set the scanning interval to 2mm, increase the flaw detector gain appropriately, and start the automatic scanning and imaging function in the detection module. After the scanning is completed, fine-tune the flaw detector gain appropriately according to the size of the abnormal area identified by the ultrasonic signal abnormal area recognition function in the detection module, and start the automatic scanning and imaging function again until the deviation between the size of the ultrasonic signal abnormal area corresponding to the artificial pre-embedded defect and its actual size does not exceed 25%. The current gain of the flaw detector is 51dB, which is the detection sensitivity of the blade body part of the composite material outer duct stator blade. The recognition results of the abnormal area of ​​the ultrasonic signal of the artificial pre-embedded defect sample are shown in the figure. Figure 4 As shown, in addition to 9 embedded defects, the sample contains two natural defects (shown in red circles in the figure). The distance between the natural defects and the artificial embedded defects is greater than 12 mm, which meets the sample production requirements.

[0107] The composite material outer duct stator blade to be inspected is placed on the product tooling, the sensitivity of the automatic inspection system is set to 51dB, the scanning interval is set to 2mm, and the automatic scanning imaging function of the profiling is started. The ultrasonic signal abnormal area recognition results of the defect-free product and a defective product are shown as follows: Figure 5 , Figure 6 As shown, the red circle is the abnormal area of ​​ultrasound signal.

[0108] During the batch product inspection process, the detection sensitivity of the automatic detection system is checked every 4 hours using artificial pre-embedded layered defect samples: the artificial pre-embedded defect samples are placed on the product fixture fixed in the water tank, the sensitivity of the automatic detection system is set to 51dB, the scanning interval is set to 2mm, and the automatic scanning imaging function of the profiling is started. After the scanning is completed, the deviation between the size of the abnormal area of ​​the ultrasonic signal corresponding to the artificial pre-embedded defect and its actual size is measured: if the deviation does not exceed 25%, it means that the sensitivity of the entire detection system is normal; if the deviation exceeds 25% and does not exceed 50%, the flaw detector gain is appropriately fine-tuned, and the automatic scanning imaging function of the profiling is started again until the deviation does not exceed 25%, and the decibel value of the current flaw detector gain is recorded as the recalibrated detection sensitivity for subsequent product inspection; if the deviation exceeds 50%, that is, the detection sensitivity is abnormal, the detection work should be suspended, and all parts of the entire detection system should be checked. After solving the problem causing the deviation of the detection sensitivity, the detection sensitivity should be re-checked. If an abnormality is found in the detection sensitivity check, after the detection sensitivity is recalibrated, all products detected after the last detection sensitivity check should be re-tested.

[0109] After the single product profiling automatic inspection is completed, if an abnormal area of ​​ultrasonic signal is identified, a single probe reflection method is used to manually re-inspect using an ultrasonic probe with a frequency of 5MHz, a chip diameter of 0.25in, and a delay block. Figure 6 The abnormal area of ​​ultrasonic signal is a pore defect with a size of about 20mm×6mm.

[0110] So far, the detection method and system of the present invention have been used to detect the blade body of nearly a thousand composite material external duct stator blades of a certain model. Compared with the original manual detection method, the influence of human factors on the detection results is reduced, the reliability, consistency and efficiency of the detection are improved, and the detection results are stored in the computer in the form of pictures, which can be traced and have a good application effect.

[0111] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

[0112] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. An ultrasonic profiling automatic detection system for composite material outer duct stator blades, characterized in that: include: Ultrasonic flaw detector (1), ultrasonic probe (2), mechanical scanning device (3), water tank (4), probe bracket (5), product tooling (6), computer (7) and detection module (8); wherein, An ultrasonic flaw detector (1) is connected to an ultrasonic probe (2); the ultrasonic probe (2) detects the object to be detected to form an ultrasonic signal; The ultrasonic probe (2) is placed at the end of the probe bracket (5); A probe bracket (5) is mounted on the end of the mechanical scanning device (3) and moves along with the movement of the mechanical scanning device (3); A product tooling (6) is placed at the bottom of the water tank (4) and is used to install the part to be tested; A water tank (4) for holding deionized water; A computer (7) collects ultrasonic signals in real time and sends them to a detection module (8); The detection module (8) is installed in the computer (7) and is used to input a profiling scanning trajectory; control the movement of the mechanical scanning device (3) according to the profiling scanning trajectory; perform profiling scanning imaging according to the ultrasonic signal to generate an image; and identify the abnormal area according to the image.

2. The ultrasonic profiling automatic detection system for composite material outer duct stator blades according to claim 1, characterized in that: The ultrasonic probe (2) comprises a transmitting probe and a receiving probe; the probe type is a water-immersed flat probe or a focusing probe; during detection, the transmitting probe, the receiving probe and the detection area of ​​the product to be detected are completely immersed in the deionized water of the water tank (4).

3. The ultrasonic profiling automatic detection system for composite material outer duct stator blades according to claim 1, characterized in that: The mechanical scanning device (3) has at least three translational degrees of freedom and two rotational degrees of freedom, and the range of motion covers the blade body of the stator blade; the ultrasonic probe (2) performs contour scanning of the object to be inspected at a set trajectory, scanning speed, and scanning interval; and the device has a manual emergency stop switch.

4. The ultrasonic profiling automatic detection system for composite material outer duct stator blades according to claim 1, characterized in that: The end positioning accuracy of the mechanical scanning device (3) is better than 1 / 60 of the maximum allowable defect size, and the minimum scanning interval is no more than 1 / 3 of the maximum allowable defect size.

5. The ultrasonic profiling automatic detection system for composite material outer duct stator blades according to claim 1, characterized in that: The probe bracket (5) keeps the relative position and posture of the transmitting probe and the receiving probe unchanged during the detection process.

6. The ultrasonic profiling automatic detection system for composite material outer duct stator blades according to claim 1, characterized in that: The ultrasonic flaw detector (1) has a gain adjustment function and a gate signal peak output function.

7. An automatic ultrasonic profiling detection method for composite material outer duct stator blades, characterized in that: include: S1. Using composite material outer duct stator blades with artificial pre-embedded delamination defect specimens, determine the detection sensitivity of the ultrasonic profiling automatic detection system; S2. Use an ultrasonic profiling automatic detection system to detect the blade body part of the composite material outer duct stator blade; S3, determine whether the inspection task is completed, if so, proceed to step S4; if not, determine whether the number of inspections exceeds the predetermined number of times or whether the time for inspecting batch products exceeds the predetermined time, if so, proceed to step S4, if not, inspect the next product and proceed to step S2; S4. Determine whether the sensitivity meets the requirements. If not, perform equipment inspection and calibration, re-test all products that have passed the last sensitivity inspection, and then proceed to step S2. If yes, determine whether the task is completed. If not, proceed to step S2. If yes, the test is completed.

8. The method for automatic ultrasonic profiling detection of composite material outer duct stator blades according to claim 7, characterized in that: The composite material outer duct stator blade artificial pre-embedded delamination defect specimen shall meet the following conditions: a. The material, ply form, thickness variation and curvature variation of the specimen are consistent with the blade body of the actual composite material outer duct stator blade, and can represent the sound attenuation characteristics of the blade body of the stator blade; the thickness deviation of the specimen shall not exceed 10%, and the curvature deviation shall not exceed 10%; b. The sample should contain at least two artificial embedded defects of different sizes, and neither size should be larger than the maximum allowable defect size; c. The spacing between artificial pre-embedded defects shall not be less than the maximum allowable defect size, and the distance between artificial pre-embedded defects and the edge of the specimen shall not be less than the maximum allowable defect size; d. The buried depth of artificial pre-buried defects of each size shall include at least three different depths; e. Use single or multiple layers of sound-impermeable materials as artificial pre-embedded defects, with the maximum thickness of a single layer not exceeding 0.15mm; f. There are no natural defects within the maximum allowable defect size range around the artificial embedded defects.

9. The method for automatic ultrasonic profiling detection of composite material outer duct stator blades according to claim 7, characterized in that: The specific method for determining the detection sensitivity of the ultrasonic profiling automatic detection system is as follows: An artificial pre-embedded defect is placed in the composite material outer duct stator blade to generate a test specimen; Place the sample on the product fixture fixed in the water tank, and inject an appropriate amount of deionized water into the water tank to make the sample completely immersed in the water; Placing a transmitting probe and a receiving probe on both sides of the sample respectively, and adjusting the gain of the ultrasonic flaw detector (1) so that the amplitude of the penetrating wave signal in the area without embedded defects in the sample reaches 70% to 85% of the full screen of the display screen of the ultrasonic flaw detector (1); Set the scanning interval to no more than 1 / 3 of the maximum allowable defect size; The gain of the ultrasonic flaw detector (1) is increased, and the detection module (8) is started to perform profiling scanning and imaging; After the scanning is completed, the flaw detector gain is adjusted according to the size of the abnormal area identified by the detection module, and the profiling scanning imaging is started again until the deviation between the size of the abnormal area of ​​the ultrasonic signal corresponding to the artificial pre-embedded defect and its actual size does not exceed 25%; The decibel value of the current flaw detector gain is recorded, which is the detection sensitivity of the blade body of the composite material outer duct stator blade.

10. The method for automatic ultrasonic profiling detection of composite material outer duct stator blades according to claim 7, characterized in that: Determine whether the sensitivity meets the requirements, specifically: Measure the deviation between the size of the abnormal area of ​​the ultrasonic signal corresponding to the artificial pre-buried defect and its actual size; If the deviation does not exceed 25%, the sensitivity meets the requirements; If the deviation exceeds 25% and does not exceed 50%, fine-tune the flaw detector gain appropriately and start the automatic scanning imaging function again until the deviation does not exceed 25%. Record the decibel value of the current flaw detector gain as the recalibrated detection sensitivity. The recalibrated detection sensitivity meets the requirements. If the deviation exceeds 50%, the sensitivity does not meet the requirements.

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