Sealed cavity thin-wall part micro-convex deformation correction method based on ultrasonic peening

Abstract

The invention relates to the technical field of surface treatment, and discloses a seal cavity thin-wall part micro-convex deformation correction method based on ultrasonic peening, which comprises the following steps of: obtaining a solid model through optical scanning, comparing a design model to obtain a deformation area and deformation amount, importing finite element software to simulate and correct the shape, determining the ultrasonic peening critical moving speed, and correcting the micro-convex deformation of a seal cavity thin-wall part. Secondly, correcting the model by using a real object characteristic piece, determining a reference shape correction parameter and correction parameters of other areas based on a moving speed coefficient, and finally performing iterative shape correction according to the deformation from large to small until the standard is reached; compared with the prior art, deformation can be accurately positioned and quantified, differential parameters are determined in combination with simulation and real objects, green and efficient correction of micro-region, non-uniform and large-size deformation is achieved through real-time feedback dynamic optimization, and a feasible means is provided for repairing and assembling of key parts in the fields of aerospace and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of surface treatment, and in particular to a method for correcting micro-convex deformation of a thin-walled part in a sealed cavity based on ultrasonic impact. Background Art

[0002] Thin-walled components for sealing cavities, key components that enclose thin-walled structures to form closed spaces, are widely used in high-end manufacturing fields such as aerospace and automotive due to their lightweight and highly integrated features. These components, influenced by material properties and processing procedures, are susceptible to non-uniform deformation during machining, heat treatment, and in-service repair (such as welding repair of aircraft engine guide vanes). This deformation is particularly pronounced due to uneven local heat input and stress release, particularly micro-area convex deformation (which can reach large dimensions in some scenarios). This deformation can directly lead to insufficient part assembly precision and even cause product discontinuation or scrapping, severely limiting production efficiency and equipment reliability.

[0003] Among existing shaping technologies, mechanical and thermal shaping have limited effectiveness in correcting micro-regional convex deformation of thin-walled parts in sealed cavities. While shot peening and laser impact technology can be used to correct some thin-walled parts, they are limited by the structural enclosure and interference issues of the sealed cavity and cannot effectively address convex deformation areas. While ultrasonic impact technology has been maturely applied in the field of material strengthening, its application in forming and shaping is still in the exploratory stage. The few existing shaping-related applications can only achieve preliminary adjustments to macroscopic deformation and cannot provide precise and controllable correction solutions for the micro-regional non-uniform convex deformation of thin-walled parts in sealed cavities. Summary of the Invention

[0004] In order to correct the micro-region convex deformation of thin-walled parts in sealed cavities that cannot be repaired by mechanical shaping, thermal shaping, shot peening and laser impact, the present invention provides a method for correcting micro-convex deformation of thin-walled parts in sealed cavities based on ultrasonic impact. The present invention can quickly and accurately locate the micro-convex deformation area and quantify the deformation amount. Combined with simulation and physical verification, the differentiated shaping parameters suitable for different deformation areas are determined, which greatly improves the pertinence and effectiveness of the correction. Secondly, the subsequent operations are adjusted according to the real-time feedback after each shaping, and the dynamic optimization of the correction process is realized. In particular, for complex deformation scenarios of "micro-region, non-uniform, and large size", green and efficient correction is achieved, providing a feasible technical means for the repair and assembly of key parts in fields such as aerospace.

[0005] The present invention is achieved through the following technical solutions: A method for correcting micro-convex deformation of thin-walled parts in a sealed cavity based on ultrasonic impact, comprising the following steps: Step 1: Scan the thin-walled component of the sealed cavity using an optical scanning device, convert the scan data into a solid model, and compare the solid model with the design model to obtain multiple non-uniform micro-convex deformation areas Ni and the deformation amount Di of each area, where i = 1, 2...m, and m is the number of deformation areas; Step 2: Import the solid model into the finite element simulation software, define the model material and material performance parameters, set the ultrasonic impact parameters and simulate the shape correction to determine the critical moving speed of the ultrasonic impact that can cause the convex deformation to produce a concave trend; Step 3: Prepare a physical feature part that matches the physical model. Correct the simulation model from step 2 using ultrasonic impact. Use the correction parameter at the maximum deformation (max(Di)) to determine the reference correction parameter Up. For other areas, use the ratio of the deformation to the maximum deformation as the movement speed coefficient Vp. Based on the movement speed coefficient Vp, correct the reference correction parameter Up to obtain the correction parameters for the corresponding area. Step 4: Perform ultrasonic impact correction on each deformed area in descending order of deformation based on the corresponding correction parameters obtained in step 3. After each correction, re-measure the deformation of each area. Iterate the correction operation according to the re-measurement results until the deformation of all areas meets the assembly technical requirements.

[0006] In the present invention, step 1 accurately locates multiple non-uniform micro-convex deformation areas and obtains deformation amounts through optical scanning and model comparison, providing an accurate deformation data basis for subsequent correction and avoiding errors in traditional detection methods; step 2 determines the critical moving speed of ultrasonic impact with the help of finite element simulation, clarifies the key parameter boundaries that can produce effective correction effects (causing convex deformation to produce a concave trend), and solves the problem of invalid correction or aggravated deformation that may be caused by blind setting of ultrasonic impact parameters; step 3 corrects the simulation model through physical feature parts and determines the benchmark correction parameters and regional correction parameters, realizing the combination of simulation and actual operation, and at the same time realizing different deformation through the moving speed coefficient. The differentiated parameter adaptation of the shaping area ensures the targeted correction; in step 4, the shaping is iterated and re-measured in order from large to small deformation, and the characteristic of "shaping in one area affects the deformation of other areas" in ultrasonic impact shaping is used to gradually optimize the overall deformation through dynamic adjustment, so that all areas finally meet the assembly requirements. It breaks through the limitations of existing technologies such as mechanical shaping, thermal shaping, shot peening and laser impact on the correction of protruding deformation of thin-walled parts in sealed cavities, and is particularly suitable for the correction of non-uniform micro-area protruding deformation of thin-walled parts in sealed cavities in fields such as aerospace during processing, heat treatment and repair. It effectively avoids the scrapping of parts due to excessive deformation, and realizes green manufacturing and cost reduction and efficiency improvement.

[0007] Furthermore, the optical scanning device is a blue light three-dimensional scanner, which can perform high-precision scanning on thin-walled parts of sealed cavities and convert the scanning data into a solid model, thereby accurately identifying multiple non-uniform micro-convex deformation areas Ni and obtaining the deformation amount Di of each area, providing an accurate initial deformation data basis for subsequent correction work, and after obtaining the deformation amount Di, it is necessary to re-measure the deformation area and deformation amount with high-precision measuring tools, which can further verify the reliability of the deformation area and deformation amount, avoid the error that may exist in a single scan affecting the accuracy of subsequent simulation, parameter determination and correction operations, and ensure that a true and reliable basis is provided for the entire ultrasonic impact correction process from the deformation detection stage.

[0008] Furthermore, in step 2, the ultrasonic impact parameters include vibration frequency, amplitude, applied load, line spacing and moving speed. By clarifying these parameters, the simulation can be more consistent with the actual ultrasonic impact scenario, laying the foundation for the subsequent determination of the critical moving speed of ultrasonic impact that can cause convex deformation to produce a concave trend, thereby ensuring the scientificity and accuracy of the simulation.

[0009] Furthermore, in step 2, the simulated correction is performed by fixing the vibration frequency, amplitude, applied load, and line spacing parameters, and only changing the moving speed to determine the critical moving speed of the ultrasonic wave. By controlling the variables, the interference of other parameters on the correction effect is eliminated, and the relationship between the key parameter of moving speed and the tendency of convex deformation to produce concave is accurately located, thereby efficiently determining the critical moving speed that can achieve the correction effect (i.e., produce a concave trend).

[0010] Furthermore, in step 2, when the ultrasonic impact parameters are simulated for correction, the values ​​of the parameters are determined based on the material properties and deformation degree of the thin-walled parts of the sealed cavity to be corrected, which can make the simulation more in line with the actual situation of the specific parts, and the simulation process needs to synchronously record the residual stress distribution and deformation trend changes under different moving speeds. In this way, the relationship between the moving speed and the residual stress and deformation trend can be clearly presented, which can not only provide data support for the determination of the critical moving speed (that is, the speed threshold at which convex deformation produces a concave trend), but also provide a reference basis for the subsequent correction of the simulation model with physical feature parts, ensuring the consistency of the simulation model with the actual correction scenario.

[0011] Furthermore, in step 3, the moving speed of the reference correction parameter Up is greater than the critical moving speed of the ultrasonic impact determined in step 2, which can ensure the correctness of the correction direction; if it is not satisfied, one of the ultrasonic impact parameters is adjusted, and steps 2 and 3 are repeated, so as to re-determine the adapted critical moving speed and reference correction parameter, forming a closed-loop logic for parameter adjustment, thereby avoiding correction failure due to improper initial parameter setting.

[0012] Furthermore, in step 3, the correction parameters of other areas are the product of the moving speed coefficient Vp and the reference correction parameter Up. By taking the reference correction parameter Up determined at the maximum deformation as the basis and combining the ratio of the deformation amount of other areas to the maximum deformation amount to calculate the corresponding correction parameters, the ultrasonic impact intensity of each deformed area can be matched with its own deformation degree, thereby ensuring the accuracy of the correction.

[0013] Furthermore, the iterative correction in step 4 is specifically as follows: Step 41: Since the ultrasonic impact correction of a certain area will affect the deformation of other areas, the area with the maximum deformation max(Di) is first corrected using the reference correction parameter Up; Step 42: After the first calibration, re-measure the deformation of each area N2i to obtain D2i. The ratio of the new maximum deformation max(D2i) to the initial maximum deformation max(Di) is used as the movement speed coefficient Vp2. The parameter obtained by Vp2×Up is used to calibrate the position at max(D2i). Through iteration, the mutual influence during the calibration process can be utilized to gradually reduce the overall deformation, avoiding local over-calibration or under-calibration due to disordered calibration. Step 43: Repeat step 42. This iterative method uses repeated measurements to provide real-time feedback on deformation changes and dynamically adjust operations. Ultimately, the deformation in all areas can gradually converge to meet the technical requirements, effectively solving the problem of thin-walled parts in sealed cavities being scrapped due to multiple non-uniform protruding deformations that are difficult to correct.

[0014] Furthermore, in step 4, the optical scanning equipment and high-precision measuring tools used in the re-measurement process are the same as those used in step 1, so as to ensure the consistency and accuracy of the deformation measurement.

[0015] Furthermore, the micro-convex deformation of the thin-walled part of the sealing cavity is a non-uniform micro-region convex deformation generated during processing, heat treatment or service repair, and the deformation amount includes a large-scale convex deformation scenario.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: In the existing technology, mechanical profiling and thermal profiling have limited effects on correcting the micro-region convex deformation of thin-walled parts in sealed cavities. Although shot peening, laser impact and other technologies can correct concave deformation or open deformation, they cannot cope with the micro-region convex deformation of parts with large interference such as sealed cavities. The present invention is specifically aimed at the non-uniform micro-region convex deformation generated by thin-walled parts in sealed cavities during processing, heat treatment and service repair, breaking through the application limitations of the existing technology, and can effectively correct such deformation that cannot be repaired by traditional methods; the present invention uses optical scanner scanning combined with high-precision measuring tool re-measurement to accurately obtain the deformation area and deformation amount, and uses finite element simulation to determine the critical moving speed of ultrasonic impact, and then uses physical feature parts to correct the model and determine the benchmark profiling parameters. At the same time, the moving speed coefficient is used to achieve differentiated parameter adaptation for different deformation areas, and finally iterative profiling and re-measurement from large to small according to the deformation amount, forming a complete closed loop of "detection-simulation-parameter optimization-iterative correction", ensuring that the correction process is accurate and controllable, and can achieve fine adjustment of micro-region deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings: Figure 1 A schematic diagram of the deformation correction process provided by the present invention; Figure 2 A schematic diagram of the convex deformation of a thin-walled member of a sealed cavity provided in an embodiment of the present invention; Figure 3 Schematic diagram of the distribution of measurement points when ultrasonic impact test is performed on thin-walled parts in sealed cavities; Figure 4 Schematic diagram of the distribution of measurement points of thin-walled parts in a sealed cavity when the method of the present invention is used for iterative shape correction. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0019] Example 1 This embodiment 1 provides a method for correcting micro-convex deformation of thin-walled parts in a sealed cavity based on ultrasonic impact, such as Figure 1 As shown, the calibration process is as follows: First, step 1 is the deformation detection stage: the operator uses a blue light three-dimensional scanner to scan the sealed cavity thin-walled part, converts the scanned point cloud data into a complete solid three-dimensional model, and then imports the solid model and the original design model into the comparison software. Through point-by-point deviation analysis, all non-uniform micro convex deformation areas (marked as Ni, i = 1, 2…m, m is the number of deformation areas) are located, and the deformation of each large size deformation area (marked as Di, i = 1, 2…m, m is the number of deformation areas) is quantified. To ensure data reliability, high-precision micrometer or three-coordinate measuring instrument is used to retest the most obvious deformation area and the corresponding deformation, if the deviation between the retest value and the scanning value is within 0.01mm, the deformation data is effective, otherwise it needs to be rescaned.

[0020] Second, step 2 is the simulation parameter determination stage: the verified solid model is imported into the finite element simulation software, and the material and related material performance parameters (such as the elastic modulus, Poisson's ratio, yield strength and other performance parameters of aluminum alloy and titanium alloy) of the solid model are defined. Then, according to the existing ultrasonic impact process, set the basic parameters of ultrasonic impact, vibration frequency 20KHz, amplitude 20μm, load 500N, line spacing 0.03mm. After fixing these parameters, only change the moving speed of the impact head (range 5-1000mm / s) to simulate the correction effect at different speeds. When the simulation result shows that the convex deformation area begins to appear concave trend, record the moving speed at this time as the critical moving speed of ultrasonic impact. When the impact effect exceeds the critical value, it will produce convex trend, that is, the deformation of the deformation area increases, which is a negative effect. Therefore, this speed is the highest threshold of subsequent correction without aggravating deformation.

[0021] Then step 3 is the correction parameter adaptation stage: according to the deformation characteristics of the solid model, a physical feature part with the same convex deformation characteristics is processed with the same material. The simulation model obtained in the above step is corrected by ultrasonic impact. Specifically, the correction requirement at the maximum deformation max(Di) is used to determine the reference correction parameter Up, the deformation degree area is calculated according to the ratio of its deformation Di to the maximum deformation max(Di) to obtain the moving speed coefficient Vp, and the correction parameter of the corresponding area is obtained by "Vp x Up" (such as a region with a deformation of 60% of the maximum deformation, its moving speed is 60% of the reference speed). Among them, the reference correction parameter Up should ensure that the moving speed is greater than the critical moving speed of the modified model, otherwise adjust one of the ultrasonic impact parameters (frequency, amplitude, load, line spacing), and repeat steps 2 and 3 until the requirements are met.

[0022] The last step 4 is an iterative correction phase: for the deformation of multiple non-uniform micro-regions of large size, the ultrasonic impact parameters are fixed, and different correction effects are achieved by controlling the moving speed coefficient Vp and the corresponding region. Since the ultrasonic impact correction method utilizes the plastic deformation generated instantaneously, the deformation degree of other places will be reduced when correction is performed at a certain place, therefore, in this embodiment, the deformation is first corrected at the place with the largest deformation max (Di) using the reference correction parameter Up according to the order from large to small; after the first correction, the deformation of each region N2i is measured to obtain D2i, and the ratio of the new maximum deformation max (D2i) to the initial maximum deformation max (Di) is taken as the moving speed coefficient Vp2, and the parameters obtained by Vp2x Up are used to correct max (D2i); after the second correction, the deformation of each region N3i is measured to obtain D3i, and the ratio of the new maximum deformation max (D3i) to the initial maximum deformation max (Di) is taken as the moving speed coefficient Vp3, and the parameters obtained by Vp3x Up are used to correct max (D3i); in this way, the deformation from large to small and the corresponding position are iteratively corrected until the technical conditions are met. In this way, the deformation of all regions is controlled within the assembly requirements, and the correction is finally completed.

[0023] Example 2 The following is a correction method for the micro-region convex deformation of a seal cavity thin-walled part of a certain guide, and the specific implementation process is as follows: After the repair welding of the aircraft engine guide, as shown in Figure 2 , micro convex deformation out-of-tolerance occurs near the welding area, with a maximum deformation of 1.6 mm, which can only be scrapped if it cannot be corrected. At this time, a blue light three-dimensional scanner is used to scan the guide comprehensively, and the data obtained by scanning is converted into an accurate solid model. Then, the solid model is carefully compared with the original design model of the guide, and the deformed regions are clearly identified with the help of professional analysis software, and are divided into 1# to 8# a total of 8 micro convex deformation zones, as shown in Figure 3 and Figure 4 . By measuring the axial distance from each region to the bottom surface, the maximum axial distance value is determined to be 1243.25 mm (corresponding to the maximum deformation zone), and the minimum is 1242.95 mm, thereby quantifying the deformation of each region. In order to ensure the accuracy of the data, high-precision measuring tools such as three-coordinate measuring machines are used to re-measure the key deformation regions and deformation, and to ensure that the measurement error is within a very small range, thereby providing a reliable data basis for subsequent correction work.

[0024] The constructed solid model was imported into the ABAQUS finite element simulation software, and the material and various performance parameters of the guide were input. For example, for specific high-temperature alloy materials, key parameters such as elastic modulus and Poisson's ratio were accurately set. The relevant parameters of ultrasonic impact were preliminarily set, including vibration frequency, amplitude, applied load, line spacing, etc. During the shape correction simulation process, the parameters such as vibration frequency, amplitude, applied load, and line spacing were fixed, and only the moving speed was changed (the moving speed was set within a certain range, such as 100-800mm / min). By continuously simulating the shape correction effects under different moving speeds and deeply analyzing the stress distribution, it was finally found that when the moving speed reached 300mm / min, the convex deformation area began to show a concave trend, thus determining that the critical moving speed of ultrasonic impact is 300mm / min.

[0025] Based on the solid model converted from the scan data, a physical feature part with corresponding deformation characteristics is manufactured. The simulation model is corrected by ultrasonic impact. Then, based on the correction requirements at the maximum deformation point, the baseline correction parameter Up is determined. The movement speed is set to 500mm / min, which is greater than the previously determined critical movement speed of 300mm / min. At the same time, the vibration frequency is set to 20kHz, the amplitude is 0.02mm, the applied load is 500N, and the line spacing is 0.03mm. For other deformation areas, the movement speed coefficient Vp is calculated according to the ratio of its own deformation to the maximum deformation. For example, if the deformation of a certain area is 0.8mm, its movement speed coefficient Vp = 0.8÷1.6=0.5, then the corresponding movement speed of this area is 500×0.5 = 250mm / min, while the remaining parameters such as vibration frequency, amplitude, applied load, line spacing, etc. remain consistent with the baseline correction parameter Up, thereby achieving adaptation of the correction parameters of different deformation areas.

[0026] Starting from the largest deformation, the most deformed area (1#) was first calibrated using the baseline calibration parameters Up. During the impact process, the impact head moved at a uniform speed along the circumference, impacting the deformed area. After the first calibration, each area was immediately re-measured using a blue light scanner. The deformation of area 1# had dropped to 0.5mm, and the new largest deformation area became area 2# (1.4mm). Based on the ratio of the new maximum deformation to the initial maximum deformation, the velocity coefficient Vp2 was calculated as 1.4÷1.6 = 0.875. The calibration parameters were then updated, adjusting the velocity to 500×0.875 = 437.5mm / min. Next, area 2# was calibrated using the updated parameters. After calibration, the deformation was re-measured again, and the deformation was reduced to 0.3mm. Calibration was performed on areas 3# through 8# in this manner, with the parameters readjusted based on the new maximum deformation after each calibration. After multiple rounds of iterative correction, the axial distances of all areas became 1241.93mm (maximum) and 1241.90mm (minimum), respectively, both meeting the technical requirement of less than 1241.65mm, and the guide correction work was successfully completed.

[0027] Through the above implementation process, the effectiveness and accuracy of the ultrasonic impact-based micro-convex deformation correction method for thin-walled parts of sealing cavities in practical applications are fully demonstrated. It can effectively solve the problem of non-uniform micro-region convex deformation of thin-walled parts of sealing cavities during processing, heat treatment or service repair, and has important application value, especially for the repair of key components such as aircraft engine guides.

[0028] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for correcting micro-convex deformation of thin-walled parts in sealed cavities based on ultrasonic impact, characterized in that: The steps include: Step 1: Scan the thin-walled component of the sealed cavity using an optical scanning device, convert the scan data into a solid model, and compare the solid model with the design model to obtain multiple non-uniform micro-convex deformation areas Ni and the deformation amount Di of each area, where i = 1, 2...m, and m is the number of deformation areas; Step 2: Import the solid model into the finite element simulation software, define the model material and material performance parameters, set the ultrasonic impact parameters and simulate the shape correction to determine the critical moving speed of the ultrasonic impact that can cause the convex deformation to produce a concave trend; Step 3: Prepare a physical feature part that matches the physical model. Correct the simulation model from step 2 using ultrasonic impact. Use the correction parameter at the maximum deformation (max(Di)) to determine the reference correction parameter Up. For other areas, use the ratio of the deformation to the maximum deformation as the movement speed coefficient Vp. Based on the movement speed coefficient Vp, correct the reference correction parameter Up to obtain the correction parameters for the corresponding area. Step 4: Perform ultrasonic impact correction on each deformed area in descending order of deformation based on the corresponding correction parameters obtained in step 3. After each correction, re-measure the deformation of each area. Iterate the correction operation according to the re-measurement results until the deformation of all areas meets the assembly technical requirements.

2. The method for correcting micro-convex deformation of thin-walled parts in sealed cavities based on ultrasonic impact according to claim 1, characterized in that: The optical scanning device is a blue light three-dimensional scanner, and after obtaining the deformation amount Di, the deformation area and deformation amount need to be re-measured using a high-precision measuring tool.

3. The method for correcting micro-convex deformation of thin-walled parts in sealed cavities based on ultrasonic impact according to claim 1, characterized in that: In step 2, the ultrasonic impact parameters include vibration frequency, amplitude, applied load, line distance and moving speed.

4. The method for correcting micro-convex deformation of thin-walled parts in sealed cavities based on ultrasonic impact according to claim 3, characterized in that: In step 2, the simulation calibration is performed by fixing the vibration frequency, amplitude, applied load, and line spacing parameters and only changing the moving speed to determine the critical moving speed of the ultrasonic wave.

5. The method for correcting micro-convex deformation of thin-walled parts in sealed cavities based on ultrasonic impact according to claim 4, characterized in that: In step 2, when the ultrasonic impact parameters are simulated for correction, the parameter values ​​are determined based on the material properties and deformation degree of the thin-walled parts of the sealed cavity to be corrected, and the simulation process needs to synchronously record the residual stress distribution and deformation trend changes under different moving speeds.

6. The method for correcting micro-convex deformation of thin-walled parts in sealed cavities based on ultrasonic impact according to claim 1, characterized in that: In step 3, the moving speed of the reference correction parameter Up is greater than the critical moving speed of the ultrasonic impact determined in step 2; if not, one of the ultrasonic impact parameters is adjusted, and steps 2 and 3 are repeated.

7. The method for correcting micro-convex deformation of thin-walled parts in sealed cavities based on ultrasonic impact according to claim 6, characterized in that: In step 3, the correction parameter of other areas is the product of the moving speed coefficient Vp and the reference correction parameter Up.

8. The method for correcting micro-convex deformation of thin-walled parts in sealed cavities based on ultrasonic impact according to claim 1, characterized in that: The iterative correction in step 4 is specifically as follows: Step 41: Perform correction at the maximum deformation max(Di) using the reference correction parameter Up; Step 42: After the first calibration, re-measure the deformation of each area N2i to obtain D2i. The ratio of the new maximum deformation max(D2i) to the initial maximum deformation max(Di) is used as the movement speed coefficient Vp2. The parameter obtained by Vp2×Up is used to calibrate the position at max(D2i). Step 43: Repeat step 42 until the size meets the technical requirements.

9. The method for correcting micro-convex deformation of thin-walled parts in sealed cavities based on ultrasonic impact according to claim 8, characterized in that: In step 4, the optical scanning equipment and high-precision measuring tools used in the re-measurement process are the same as those in step 1.

10. The method for correcting micro-convex deformation of thin-walled parts in sealed cavities based on ultrasonic impact according to claim 8, characterized in that: The micro-convex deformation of the thin-walled part of the sealing cavity is a non-uniform micro-region convex deformation generated during processing, heat treatment or service repair, and the deformation amount includes large-scale convex deformation scenarios.

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