Method for detecting thickness of super-high-temperature coating on surface of complex curved member

Abstract

The application provides a kind of complex curved surface component surface ultra-high temperature coating thickness detection method, comprising: the surface of complex curved surface component is divided into multiple mark regions, and the reflective marker site and the encoding marker site of multiple mark regions are determined respectively;Reflective marker site and encoding marker site do not overlap in the orthographic projection of reference surface;Reflective marker is pasted at reflective marker site;Encoding marker is pasted at encoding marker site;Complex curved surface component, reflective marker and encoding marker are scanned three-dimensionally, and the three-dimensional stereogram of the surface of complex curved surface component is obtained;The thickness of ultra-high temperature coating at encoding marker site is measured respectively, and the corresponding thickness value is displayed at the corresponding encoding marker site in three-dimensional stereogram.It can effectively evaluate the thickness of ultra-high temperature coating on the surface of complex curved surface component, and promote the industrialization of complex curved surface component and ultra-high temperature coating.

Description

Technical Field

[0001] This application relates to the field of measurement and testing technology for special components of spacecraft, and in particular to a method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components. Background Technology

[0002] In recent years, with the rapid development of the manufacturing industry, the shapes of functional components have become increasingly complex. Various curved geometric components are widely used as key parts in critical fields such as aerospace, energy, and power equipment. These complex curved components, such as turbine engine blades, nose cones, and aerodynamic control leading edges, require high machining precision and are used under complex mechanical loads or extreme working environments, making them highly susceptible to damage defects such as microcracks, porosity, and inclusions. Coatings are typically applied to their surfaces to achieve protection. Coatings on special spacecraft components are generally ultra-high temperature sprayed coatings. The coating's protective function against ablation and other damage is crucial, and its thickness and morphology directly affect the normal use of the component. These coatings are generally thin, and the components have significant curvature, making it difficult to measure their thickness using ordinary thickness measurement methods. Summary of the Invention

[0003] In view of this, the purpose of this application is to propose a method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components.

[0004] To achieve the above objectives, this application provides a method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components, including:

[0005] The surface of the complex curved component is divided into multiple marking regions, and reflective marking sites and coded marking sites are determined for each of the multiple marking regions; the orthographic projection of the reflective marking sites on the reference surface does not overlap with the orthographic projection of the coded marking sites on the reference surface.

[0006] Affix the corresponding reflective marker at the designated reflective marker location;

[0007] Paste the corresponding coded marker at the coded marker site;

[0008] The complex curved surface component, reflective markers, and coded markers are scanned in three dimensions to obtain a three-dimensional image of the complex curved surface component; the three-dimensional image contains reflective marker points and coded marker points;

[0009] The thickness of the ultra-high temperature coating at each of the coded marker sites is measured, and the corresponding thickness value is displayed at the corresponding coded marker site in the three-dimensional image.

[0010] In some embodiments, dividing the surface of the complex curved component into multiple marked regions and determining the encoded marker site for each marked region includes:

[0011] Based on the component type of the complex curved surface component, the surface of the complex curved surface component is divided into corresponding marking regions, and the number of coded marking sites in each marking region is determined; the component type of the complex curved surface component is an R-angle component or a non-R-angle component;

[0012] Determine the distribution of coding marker sites for each marker region.

[0013] In some embodiments, the step of dividing the surface of the complex curved surface component into corresponding marked regions according to the component type, and determining the number of coded marker sites in each marked region specifically includes:

[0014] The complex curved surface component is an R-shaped component, and the marked areas include the top area, upper middle layer area, middle layer area, lower middle layer area and bottom layer area;

[0015] The number of coding marker sites in the marked region is determined based on the angle of the R-angle.

[0016] In some embodiments, determining the number of coding marker sites in the marked region based on the angle of the R-angle includes:

[0017] The R-angle is greater than 50°, and the number of coding marker sites in the top region is greater than or equal to 3; the number of coding marker sites in the upper region, the middle region, the lower middle region, and the bottom region is greater than or equal to 5 respectively.

[0018] In some embodiments, determining the number of coding marker sites in the marked region based on the angle of the R-angle includes:

[0019] The R angle is less than or equal to 50°, and the number of coding marker sites in the top region is greater than or equal to 1; the number of coding marker sites in the upper region, the middle region, the lower middle region, and the bottom region is greater than or equal to 3 respectively.

[0020] In some embodiments, the step of dividing the surface of the complex curved surface component into corresponding marked regions according to the component type, and determining the number of coded marker sites in each marked region specifically includes:

[0021] The component type of the complex curved surface component is a non-R-angle component, and the marked areas are the upper-middle layer area, the middle layer area, and the lower-middle layer area of ​​the front side; the upper-middle layer area, the middle layer area, and the lower-middle layer area of ​​the back side.

[0022] The number of coding marker sites in the upper-middle layer region, the middle layer region, and the lower-middle layer region is greater than or equal to 3.

[0023] In some embodiments, after affixing the corresponding reflective marker at the reflective marker site, and before affixing the corresponding coded marker at the coded marker site, the following steps are included:

[0024] A ruler is pasted on each of the marked areas; the orthographic projections of the ruler on the reference plane, the orthographic projections of the reflective marking points on the reference plane, and the orthographic projections of the coded marking points on the reference plane do not overlap.

[0025] In some embodiments, the R-shaped member is a nose cone.

[0026] In some embodiments, the non-R-angle member is the leading edge of an air rudder.

[0027] In some embodiments, the 3D scanning is performed using a non-contact 3D scanner.

[0028] As can be seen from the above, the method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components provided in this application divides the surface of the complex curved component into multiple marked areas and determines reflective marking points and coded marking points in each of the multiple marked areas; the orthographic projections of the reflective marking points on the reference plane do not overlap with the orthographic projections of the coded marking points on the reference plane; corresponding reflective markers are pasted at the reflective marking points; corresponding coded markers are pasted at the coded marking points; the complex curved component, reflective markers, and coded markers are three-dimensionally scanned to obtain a three-dimensional image of the surface of the complex curved component; the three-dimensional image includes reflective marking points and coded marking points; the thickness of the ultra-high temperature coating at each coded marking point is measured, and the corresponding thickness value is displayed at the corresponding coded marking point in the three-dimensional image. This method can detect the thickness of ultra-high temperature coatings on the surface of complex curved components, and combined with a three-dimensional imaging system, it can accurately measure and display the thickness of complex curved components from all directions, effectively evaluate the thickness of ultra-high temperature coatings on the surface of complex curved components, and promote the industrialization of complex curved components and ultra-high temperature coatings. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "comprising" or "including," and similar terms used in the embodiments of this application, mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] Currently, ultra-high temperature refractory metal-based composite materials prepared using "micro-nano composite-oxidation inhibition" technology for special spacecraft components exhibit significant performance advantages over other ultra-high temperature materials in terms of mechanical properties, high-temperature erosion and ablation resistance, and machinability. They hold immense potential for application in ultra-high temperature components of hypersonic aerospace weaponry and represent the optimal and feasible solution for special spacecraft components such as nose cones and aerodynamic control leading edges. This ultra-high temperature refractory metal-based composite material is a tungsten-based alloy reinforced with ceramic reinforcement, exhibiting excellent high-temperature erosion and ablation resistance, and can be used at temperatures above 2000℃. To ensure the components' resistance to ablation and oxidation at high temperatures, a heat-insulating ceramic coating of titanium carbide and titanium boride ceramic powder is formed on the component surface using a sintering method. This coating effectively protects the matrix material from oxidation, ensuring the normal operation of components such as nose cones and aerodynamic control leading edges.

[0032] In special spacecraft components, coating specifications include a thickness ≤200μm and a thickness uniformity of ±20μm. Coating thickness and uniformity determine coating performance, making the detection of coating thickness and uniformity crucial for quality control of these components. Currently, the detection of coating thickness for special spacecraft components primarily focuses on planar coatings. The accuracy for detecting the thickness of coatings on curved spacecraft components is insufficient, thus lacking effective methods for measuring the thickness of coatings on curved spacecraft components.

[0033] Based on this, the embodiments of this application provide a method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components, which can solve the problem of insufficient accuracy in detecting the thickness of coatings on curved spacecraft components to a certain extent.

[0034] This application provides a method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components, including:

[0035] Step (a) involves dividing the surface of the complex curved component into multiple marking regions, and determining the reflective marking sites and coded marking sites for each of the multiple marking regions; the orthographic projections of the reflective marking sites onto the reference surface and the orthographic projections of the coded marking sites onto the reference surface do not overlap; wherein, the reference surface can be, for example, a horizontal surface;

[0036] Step (b): Affix the corresponding reflective marker at the reflective marker location;

[0037] Step (c): Affix the corresponding coded marker at the coded marker site;

[0038] Step (d) involves performing a three-dimensional scan on the complex curved surface component, reflective markers, and coded markers to obtain a three-dimensional stereoscopic image of the complex curved surface component's surface; the three-dimensional stereoscopic image includes reflective marker points and coded marker points.

[0039] Step (e) involves measuring the thickness of the ultra-high temperature coating at each of the coded marker sites and displaying the corresponding thickness value at the corresponding coded marker site in the three-dimensional image.

[0040] The method for detecting the thickness of ultra-high temperature coatings on complex curved surface components provided in this application divides the surface of the complex curved surface component into multiple marked areas and determines reflective marking points and coded marking points in each of the multiple marked areas. The orthographic projections of the reflective marking points on the reference plane do not overlap with the orthographic projections of the coded marking points on the reference plane. Corresponding reflective markers are affixed to the reflective marking points; corresponding coded markers are affixed to the coded marking points; the complex curved surface component, reflective markers, and coded markers are three-dimensionally scanned to obtain a three-dimensional image of the surface of the complex curved surface component; the three-dimensional image includes reflective marker points and coded marking points; the thickness of the ultra-high temperature coating at each coded marking point is measured, and the corresponding thickness value is displayed at the corresponding coded marking point in the three-dimensional image. This method enables the detection of the thickness of ultra-high temperature coatings on the surface of complex curved surface components. Combined with a three-dimensional imaging system, it allows for accurate measurement and display of the thickness of complex curved surface components from all directions, effectively evaluating the thickness of ultra-high temperature coatings on the surface of complex curved surface components, and promoting the industrialization of complex curved surface components and ultra-high temperature coatings.

[0041] In step (a), the surface of the complex curved surface component can be divided according to its type to obtain multiple marked regions. The number of coded marker sites and their specific distribution in each marked region are then determined. The types of complex curved surface components can include rounded (R-angle) components and non-R-angle components. R-angle components can be understood as components with curved corners, such as rounded corner components, including nose cones. Non-R-angle components can be understood as components with right angles, such as rectangular and trapezoidal shapes, including leading edges of air rudders.

[0042] Reflective markers are used to image complex curved surfaces during subsequent 3D scanning. It should be understood that the principle for setting reflective markers is to ensure that each area can be clearly imaged by the 3D scanning equipment. At least three reflective markers can be set in each marked area of ​​the complex curved surface. Different reflective markers must not overlap, and any two reflective markers should not be too close together to avoid the 3D scanning system being unable to correctly identify them. Furthermore, reflective markers need to be randomly placed, avoiding a regular straight line arrangement, to ensure the 3D scanning system can correctly identify the reflective markers.

[0043] The distribution principles for coded marker sites are as follows: coded marker sites must not overlap with reflective marker sites; different coded marker sites must not overlap, meaning any two coded marker sites cannot overlap. The coded marker sites should be randomly distributed, avoiding a regular straight line arrangement, to facilitate subsequent scanning of the coded marker sites, and to ensure that at least six clear coded marker sites appear in each captured image. Sufficient coded marker sites must be placed in suitable and easily accessible locations to facilitate subsequent thickness marking at the coded marker sites.

[0044] In some embodiments, dividing the surface of the complex curved component into multiple marked regions and determining the coded marker sites in each marked region includes: dividing the surface of the complex curved component into corresponding marked regions according to the component type of the complex curved component, and determining the number of coded marker sites in each marked region; the component type of the complex curved component is an R-angle component or a non-R-angle component; and determining the distribution of coded marker sites in each marked region. Specifically, when determining the number and distribution of coded marker sites in each marked region, each marked region can be divided evenly before determining the number and distribution of coded marker sites.

[0045] In some embodiments, dividing the surface of the complex curved surface component into corresponding marking regions based on its component type and determining the number of coded marker sites in each marking region specifically includes: the component type of the complex curved surface component is an R-angle component, and the marking regions include a top region, an upper-middle region, a middle region, a lower-middle region, and a bottom region; the number of coded marker sites in the marking regions is determined based on the angle of the R-angle. The top region, upper-middle region, middle region, lower-middle region, and bottom region can be understood as being divided from top to bottom according to the actual usage state of the R-angle component. For example, the top region, upper-middle region, middle region, lower-middle region, and bottom region can be divided according to the direction from the narrow top to the wide bottom of the nose cone.

[0046] In some embodiments, determining the number of coded marker sites in the marking region based on the angle of the R-angle includes: if the R-angle angle is greater than 50°, the number of coded marker sites in the top region is greater than or equal to 3; and the number of coded marker sites in the upper region, the middle region, the lower middle region, and the bottom region is greater than or equal to 5 each. In other embodiments, determining the number of coded marker sites in the marking region based on the angle of the R-angle includes: if the R-angle angle is less than or equal to 50°, the number of coded marker sites in the top region is greater than or equal to 1; and the number of coded marker sites in the upper region, the middle region, the lower middle region, and the bottom region is greater than or equal to 3 each. This facilitates subsequent uniform testing of the thickness of the R-angled component, etc.

[0047] In some embodiments, dividing the surface of the complex curved surface component into corresponding marked areas according to the component type, and determining the number of coded marker sites in each marked area specifically includes: the component type of the complex curved surface component is a non-R-angle component; the marked areas are the upper-middle layer area, the middle layer area, and the lower-middle layer area of ​​the front side; and the upper-middle layer area, the middle layer area, and the lower-middle layer area of ​​the back side; the number of coded marker sites in the upper-middle layer area, the middle layer area, and the lower-middle layer area of ​​the front side and the upper-middle layer area, the middle layer area, and the lower-middle layer area of ​​the back side are each greater than or equal to 3. Here, the front and back sides can be understood as symmetrical upper and lower halves divided with the center as the plane of symmetry according to the actual usage state of the aerodynamic rudder leading edge. For example, the upper-middle layer area, the middle layer area, and the lower-middle layer area of ​​the front side can be obtained by dividing the front side of the aerodynamic rudder leading edge from top to bottom. The upper-middle, middle, and lower-middle regions on the reverse side can be divided from bottom to top along the reverse side of the aerodynamic rudder leading edge, meaning they are symmetrical about the center plane to the top-to-bottom division of the front side. Each region has at least three coded markers. This facilitates subsequent uniform testing of the thickness of non-R-angle components.

[0048] In some embodiments, in step (b), the reflective marker may be a reflective marker ball or the like.

[0049] In some embodiments, after step (b), the process may further include placing adhesive rulers in the marked areas; the orthographic projections of the rulers on the reference plane, the orthographic projections of the reflective marking points on the reference plane, and the orthographic projections of the coded marking points on the reference plane do not overlap. The reference plane can be understood as a horizontal plane, etc. The principles for attaching (i.e., placing) the rulers include ensuring the rulers are placed in a location easily accessible for photography, and that the rulers do not deform after photography. When placing the rulers, it is necessary to avoid squeezing the ends of the rulers, avoid placing heavy objects on the ruler rod, and avoid fixing only the two sides of the ruler while leaving the middle part suspended, etc., to better prevent ruler deformation. For large components, the rulers need to be placed around the perimeter of the component.

[0050] In some embodiments, in step (c), the coded marker can be a reflective marker ball or the like with a numerical designation. For example, a numerical designation can be affixed to the surface of the reflective marker ball to give it a numerical designation.

[0051] In some embodiments, in step (d), the surface of a complex curved component can be scanned in three dimensions using a non-contact 3D scanner. That is, the 3D scan is performed using a non-contact 3D scanner. This method of using a non-contact 3D scanner offers advantages such as ease of transport to industrial sites or production workshops, and the ability to perform measurements based on the size, shape, and scanning environment of the component. The non-contact 3D scanner can acquire 3D data of complex curved components using an industrial camera based on machine vision principles, and automatically stitch the data together using reflective marker information to achieve basic 3D scanning and measurement functions.

[0052] The specific scanning process may include connecting a 3D scanning device to a computer according to the operating procedures, entering the scanning software, creating a new scanning session and entering photogrammetry mode to perform photogrammetry work, and calculating the 3D coordinates of the centers of the reflective marker sites and coded marker sites. Finally, the reflective markers, coded markers, and component surfaces are scanned to generate a 3D stereoscopic image of the component, outputting a 3D deviation chromatogram for each tolerance or an output 2D image, and generating a 3D scanning dimension measurement report.

[0053] In some embodiments, in step (e), the thickness of the ultra-high temperature coating at the coded marker site can be measured using an eddy current thickness gauge, achieving a measurement accuracy of ±2 μm. After the thickness measurement, the thickness data for each coded marker point can be displayed on the aforementioned generated three-dimensional image. This allows for a visual observation of the thickness of the complex curved surface component from different orientations in a three-dimensional format.

[0054] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0055] Example 1

[0056] Complex curved surface component: a nose cone with an R-angle of 50°. The component material is a tungsten-based alloy reinforced with ceramic, and the coating material is a ceramic coating. Nine nose cones were used for omnidirectional thickness measurement, and the nine nose cones were named as No. 1, No. 2, No. 3, No. 4, No. 5, No. 6, No. 7, No. 8, and No. 9.

[0057] Test Method: A non-contact 3D scanner (e.g., XTOM-MATRIX high-precision 3D scanner) was used to scan the surface of the complex curved component to obtain a 3D model. During measurement, two coded marker points were used in the top region; four coded marker points were used in each of the upper, middle, lower-middle, and bottom regions. An eddy current thickness gauge was used to measure the thickness. The measured thickness values ​​were then displayed on the 3D model corresponding to the coded marker points.

[0058] Test results: The test results of Example 1 are shown in Table 1.

[0059] Verification Example 1

[0060] The difference from Example 1 is that the nose cones numbered 1 and 5 were subjected to destructive processing, and the coating thickness was measured using a metallographic microscope.

[0061] Test results: The test results for verification example 1 are shown in Table 2.

[0062] Example 2

[0063] Complex curved surface component: the leading edge of the air rudder, the component material is tungsten-based alloy with ceramic reinforcement, and the coating material is ceramic coating. Nine air rudder leading edges were set up for all-round thickness measurement, and the nine nose cones were named number 1, number 2, number 3, number 4, number 5, number 6, number 7, number 8 and number 9 respectively.

[0064] Test Method: A non-contact 3D scanner (e.g., XTOM-MATRIX high-precision 3D scanner) was used to scan the surface of the complex curved component to obtain a 3D model. During measurement, three coded markers were used for each of the front (upper-middle, middle, and lower-middle areas) and the reverse (upper-middle, middle, and lower-middle areas). An eddy current thickness gauge was used to measure the thickness. The measured thickness values ​​were then displayed on the 3D model corresponding to the coded marker positions.

[0065] Test results: The test results of Example 2 are shown in Table 3.

[0066] Verification Example 2

[0067] The difference from Example 2 is that the leading edges of the air rudders numbered 1 and 5 were subjected to destructive processing, and the coating thickness was measured using a metallographic microscope.

[0068] Test results: The test results for verification example 2 are shown in Table 4.

[0069] Table 1: Coating thickness measurement results for the 9 nose cones with an R-angle of 50° in Example 1

[0070]

[0071] Table 2: Coating thickness measurement results for the two nose cones with an R-angle of 50° in Verification Example 1

[0072]

[0073] Results Analysis: As shown in Tables 1 and 2, the method for measuring coating thickness using omnidirectional three-dimensional imaging in this application has an error of less than 5% between the coating thickness measured for the R-angle nose cone component and the coating thickness measured by metallographic method. Therefore, the method in this application has good testing accuracy for the coating thickness of the R-angle nose cone component.

[0074] Table 3: Coating thickness measurement results of the leading edges of the nine non-R-angle aerodynamic rudders in Example 2

[0075]

[0076] Table 4: Coating thickness measurement results of the two non-R-angled air rudder leading edges in Verification Example 2

[0077]

[0078] Results Analysis: As shown in Tables 3 and 4, the method for measuring coating thickness using omnidirectional three-dimensional imaging in this application has an error of less than 5% compared to the coating thickness measured by metallographic methods for the leading edge of non-R-angle air rudders. Therefore, the method in this application demonstrates good testing accuracy for the coating thickness of the leading edge of air rudders.

[0079] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0080] With the specific details (e.g., circuits) set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that embodiments of this application may be practiced without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0081] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0082] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components, characterized in that, include: The surface of the complex curved component is divided into multiple marking regions, and the reflective marking sites and coded marking sites of the multiple marking regions are determined respectively; The orthographic projection of the reflective marker site onto the reference plane does not overlap with the orthographic projection of the coded marker site onto the reference plane; wherein, the complex curved surface component is a spacecraft component; Affix the corresponding reflective marker at the designated reflective marker location; Paste the corresponding coded marker at the coded marker site; The complex curved surface component, reflective markers, and coded markers are scanned in three dimensions to obtain a three-dimensional image of the complex curved surface component; the three-dimensional image contains reflective marker points and coded marker points; The thickness of the ultra-high temperature coating at each of the coded marker sites is measured, and the corresponding thickness value is displayed at the corresponding coded marker site in the three-dimensional image. The step of dividing the surface of the complex curved component into multiple marked regions and determining the encoded marker sites for each marked region includes: Based on the component type of the complex curved surface component, the surface of the complex curved surface component is divided into corresponding marking regions, and the number of coded marking sites in each marking region is determined; the component type of the complex curved surface component is either an R-angle component or a non-R-angle component; the marking regions of R-angle components and non-R-angle components are different; Determine the distribution of coding marker sites in each marker region; Specifically, when determining the number and distribution of coding marker sites in each marker region, each marker region is divided into equal parts, and then the number and distribution of coding marker sites in each marker region are determined.

2. The method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components according to claim 1, characterized in that, The step of dividing the surface of a complex curved surface component into corresponding marked regions based on its component type and determining the number of coded marker sites in each marked region specifically includes: The complex curved surface component is an R-shaped component, and the marked areas include the top area, upper middle layer area, middle layer area, lower middle layer area and bottom layer area; The number of coding marker sites in the marked region is determined based on the angle of the R-angle.

3. The method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components according to claim 2, characterized in that, The determination of the number of coding marker sites in the marked region based on the angle of the R angle includes: The R-angle is greater than 50°, and the number of coding marker sites in the top region is greater than or equal to 3; the number of coding marker sites in the upper region, the middle region, the lower middle region, and the bottom region is greater than or equal to 5 respectively.

4. The method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components according to claim 2, characterized in that, The determination of the number of coding marker sites in the marked region based on the angle of the R angle includes: The R angle is less than or equal to 50°, and the number of coding marker sites in the top region is greater than or equal to 1; the number of coding marker sites in the upper region, the middle region, the lower middle region, and the bottom region is greater than or equal to 3 respectively.

5. The method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components according to claim 1, characterized in that, The step of dividing the surface of a complex curved surface component into corresponding marked regions based on its component type and determining the number of coded marker sites in each marked region specifically includes: The component type of the complex curved surface component is a non-R-angle component, and the marked areas are the upper-middle layer area, the middle layer area, and the lower-middle layer area of ​​the front side; the upper-middle layer area, the middle layer area, and the lower-middle layer area of ​​the back side. The number of coding marker sites in the upper-middle layer region, the middle layer region, and the lower-middle layer region is greater than or equal to 3.

6. The method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components according to claim 1, characterized in that, After affixing the corresponding reflective marker at the reflective marker site, and before affixing the corresponding coded marker at the coded marker site, the process further includes: A ruler is pasted on each of the marked areas; the orthographic projections of the ruler on the reference plane, the orthographic projections of the reflective marking points on the reference plane, and the orthographic projections of the coded marking points on the reference plane do not overlap.

7. The method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components according to claim 1, characterized in that, The R-shaped component is a nose cone.

8. The method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components according to claim 1, characterized in that, The non-R-angle component is the leading edge of the air rudder.

9. The method for detecting the thickness of ultra-high temperature coatings on the surface of complex curved components according to claim 1, characterized in that, The 3D scan is performed using a non-contact 3D scanner.

Images