A high-pressure whole blade ring blade profile three-dimensional optical measurement method

Abstract

The application provides a high-pressure integral blade ring blade profile three-dimensional optical measurement method, which realizes high-pressure closed integral blade ring blade profile three-dimensional optical measurement by developing agent spraying treatment on the surface of the integral blade ring, especially the inlet and outlet edges. The surface of the part is sprayed with developing agent before measurement; in order to improve the scanning quality of the high-pressure integral blade ring blade profile, especially the inlet and outlet edges, a mixture of titanium dioxide and industrial alcohol is used for spraying; a special tool clamp is designed to connect the part and the optical measurement machine, which has an automatic centering function and facilitates the data collection of the measurement head on the upper and lower parts of the integral blade ring. The surface data of the integral blade ring blade profile is optically scanned. The application has the advantages that the high-pressure integral blade ring three-dimensional optical automatic measurement is realized, the measurement precision of the high-pressure integral blade ring blade profile is improved, the efficiency is improved by more than 50%, and the method can be popularized to the measurement of fan integral blade rings, so that the application has wide market prospects and huge economic benefits.

Description

Technical Field

[0001] This invention relates to the field of integral blade ring measurement technology, and in particular to a three-dimensional optical measurement method for the blade profile of a high-pressure integral blade ring. Background Technology

[0002] The high-pressure integral blade ring is located at the high-pressure compressor end of the engine. Its complex blade shape and thinner edges, coupled with its double-blade structure, pose significant challenges to inspection. Conventional three-dimensional optical measurement methods require attaching and assembling reference points to the part surface, and the quality of edge data scanning is inconsistent, resulting in unreliable measurement accuracy and an inability to accurately represent the machining state of the integral blade ring. Summary of the Invention

[0003] This invention summarizes and establishes a three-dimensional optical measurement method for the high-pressure integral blade ring profile of aero-engines. This method adopts a three-dimensional optical measurement process, determines the developer spraying parameters and optical scanning parameters before part measurement, and designs a special measurement fixture, thereby realizing three-dimensional optical measurement of the high-pressure integral blade ring profile and improving measurement accuracy and efficiency.

[0004] This invention provides a three-dimensional optical measurement method for the blade profile of a high-pressure integral blade ring. Before optical measurement of the high-pressure integral blade ring, the surface of the integral blade ring, especially the inlet and outlet edges, is treated with a developer spray. Appropriate optical measurement parameters are selected, and a special measurement fixture is used to realize the three-dimensional optical measurement of the blade profile of a high-pressure closed integral blade ring.

[0005] (1) Before measurement, spray the surface of the part with a developer. To improve the overall blade profile of the high-pressure air intake and exhaust, especially the scanning quality of the intake and exhaust edges, a mixture of titanium dioxide and industrial alcohol is used for spraying. The number of sprayings does not exceed 5, and the visual coverage reaches more than 100%.

[0006] (2) Design and application of special measuring fixtures To avoid attaching reference points to the surface of the parts, fix the parts, and facilitate the adjustment of the optical probe's measurement posture, a special tooling fixture is designed to connect the parts to the optical measuring machine. It has an automatic centering function, which facilitates the probe to collect data in the upper and lower parts of the overall blade ring.

[0007] The fixture consists of a support column assembly, a support cover plate assembly, a large contact ring, an outer center adjustment assembly, a small contact ring, an inner center adjustment assembly, a angular positioning structure, and a scale positioning assembly. The support column assembly includes a column, a bottom connecting plate, and a top connecting structure. The support cover plate assembly includes a support arm and a connecting block. The outer center adjustment assembly includes an axial positioning structure and a radial clamping structure. The inner centering assembly includes an axial positioning structure and a radial clamping structure. The scale positioning assembly includes a scale mounting slot, a clamping device, and a lifting ring. The support column assembly is bolted to the equipment turntable. The top connecting structure and the support cover plate assembly are connected with a clearance fit and angular bolts for tightening. The part is placed on the axial positioning plate of the inner centering assembly. The knob is adjusted to align the part, fixture, and turntable on the same axis of rotation. The outer center adjustment assembly is then adjusted to a suitable position. Figure 1 As shown.

[0008] (3) Optical scanning of overall blade ring airfoil surface data Based on the accuracy requirements of high-pressure integral blade ring measurement, a suitable optical lens group and standard scale are selected, the scanning probe path is compiled, and appropriate scanning process parameters are set to obtain three-dimensional data of the high-pressure integral blade ring surface.

[0009] Advantages of this invention: The three-dimensional optical measurement method for high-pressure integral blade ring profile described in this invention, using the measurement method described in this patent, realizes automatic three-dimensional optical measurement of high-pressure integral blade ring profile, improves the measurement accuracy of high-pressure integral blade ring profile, increases efficiency by more than 50%, and can be extended to the measurement of fan integral blade rings, with broad market prospects and huge economic benefits. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a special fixture; Figure 2 Assembly drawing of the integral blade ring three-dimensional optical measurement fixture; Figure 3 Schematic diagram of a hexagonal ring structure; Figure 4 Schematic diagram of centering component with graduated lines and angular orientation structure; Figure 5 Schematic diagram of the scale positioning component; Figure 6 Paste the reference point and the code point; Figure 7 Schematic diagram of spraying developer; Figure 8 Simulation diagram of measurement fixtures and measurement path; In the diagram, there are: 1. Support column assembly; 2. Support cover plate assembly; 3. Large abutment ring; 4. Outer center adjustment assembly; 5. Small abutment ring; 6. Inner centering assembly; 7. Angular structure; and 8. Scale positioning assembly. Detailed Implementation

[0011] The present invention will be further explained below with reference to specific implementation schemes, but it is not limited to the present invention. The structures, proportions, sizes, etc. shown in the accompanying drawings are only used to complement the content disclosed in the specification, so as to enable those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0012] (1) Select appropriate measuring equipment Taking a high-pressure integral blade ring with a diameter of 510mm and 101 blades as an example, a measuring machine with the required accuracy is selected. Considering the characteristic that the inlet and outlet edge radius of the blade is about 0.2mm, the pixel spacing of the imaging grid is selected to be less than 0.05mm, ensuring that there are no less than 12 edge imaging points. The selected lens group has a shape error ≤0.002mm, a size error ≤0.004mm, and a ball spacing error ≤0.006mm. A 0.8mm dedicated measurement reference point and a 2.5mm coded point are selected. The measuring machine has a path simulation function.

[0013] (2) Paste reference points and coding points Dedicated reference points and coded points are affixed to the surfaces of the large and small affix rings and the scale positioning components on the tooling to ensure that within any measurement volume of 170x130x110mm, there are no fewer than 8 reference points and no fewer than 3 coded points. Figure 6 As shown.

[0014] (3) Spray a special developer on the surface of the parts. Wipe the surface of the nozzle ring part to be tested to remove dirt and ensure the surface is clean and dry. Transport the prepared part to the powder coating room for powder coating. Prepare a developer by mixing industrial alcohol and special titanium dioxide powder (diameter less than 0.001mm, particles that do not easily adhere) in a 1:10 to 1:15 ratio. Keep the nozzle 200-300mm away from the part surface, spraying at a speed not exceeding 0.2m / s, and at the edges not exceeding 0.1m / s. Do not spray the same area more than 3 times. The spraying area should cover the part to be tested and the measurement reference area. Visually inspect the developer coverage on the part surface; it should be greater than 100%. Figure 7 As shown, after the powder coating is completed, it is clamped onto a special fixture.

[0015] (4) Tooling installation and adjustment Clamp the special fixture onto the measuring machine turntable. First, align the four holes on the fixture base with the four threaded holes on the measuring machine turntable. Simultaneously, align the position of the angle bolt hole in the fixture with the mark X1 on the turntable's graduations, and tighten the angle bolt. Install the part onto the measuring fixture, ensuring your hands primarily contact the inner ring of the part and avoid touching the powder-coated area to prevent damage to the powder coating. Install the scale into the mounting slot on the top of the fixture. Figure 8 As shown.

[0016] (5) Measurement trajectory planning During shooting, it is recommended to first photograph the scale position, and simultaneously use a turntable to measure, rotating the shooting fixture and scale at different tilt angles from top to bottom. Use a scanning measurement series to scan single or several blades, with the binocular line of the measuring head roughly parallel to the blade's inlet and outlet. When photographing the inlet and outlet edges, tilt the measuring head slightly by about 20°-40°, then photograph the edge at multiple angles along the edge as the axis. More scanning parameters can be selected to improve the stability of the sampling points and avoid missing points in some areas due to uneven powder spraying. After the trajectory is generated, run the automatic acquisition program as follows: Figure 8 As shown.

[0017] (6) Quality inspection of three-dimensional data grid After completing a data acquisition, the measured point cloud is meshed. When the point cloud data is too large to be handled manually, the median filtering method is used to smooth the mesh to generate the three-dimensional data of the measured part. The mesh quality is checked to see if there are any defects such as missing points or folds on the mesh surface. Steps 5 and 6 above are repeated until the mesh data is complete and smooth.

[0018] (7) Overall leaf ring leaf shape data analysis Import the overall blade ring model into the software, establish a benchmark according to the drawing requirements, and align the theoretical model with the actual test model by aligning geometric elements or by surface-line-point alignment. Calculate and evaluate the blade section parameters according to the testing process.

[0019] Matters not covered in this invention are common knowledge.

[0020] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure shrouded blade ring blade profile three-dimensional optical measurement method, characterized by: Before high-pressure integral blade ring optical measurement, the surface of the integral blade ring, including the inlet and outlet edges, is treated with developer spraying to realize high-pressure closed integral blade ring blade shape three-dimensional optical measurement. (1) Before measurement, spray a developer onto the surface of the part; To improve the quality of high-pressure integral blade ring profile, including the scanning quality of the inlet and outlet edges, a mixture of titanium dioxide and industrial alcohol is used for spraying. The number of spraying times does not exceed 5, and the visual coverage reaches more than 100%. (2) Design and application of special measuring fixtures; To avoid attaching reference points to the surface of the parts, fix the parts, and facilitate the adjustment of the measurement posture of the optical probe, a special tooling fixture is designed to connect the parts to the optical measuring machine. It has an automatic centering function, which makes it convenient for the probe to collect data in the upper and lower parts of the overall blade ring. (3) Optical scanning of overall blade ring and blade profile surface data; Based on the accuracy requirements for measuring the high-pressure integral blade ring, a suitable optical lens group and standard scale are selected, a scanning probe path is compiled, and appropriate scanning process parameters are set to acquire three-dimensional data of the high-pressure integral blade ring surface. The specialized tooling fixture comprises a support column assembly, a support cover plate assembly, a large contact ring, an outer center adjustment assembly, a small contact ring, an inner center adjustment assembly, a fixed angular structure, and a scale positioning assembly. The support column assembly includes a column, a bottom connecting plate, and a top connecting structure. The support cover plate assembly includes a support arm and a connecting block. The outer center adjustment assembly includes an axial positioning structure and a radial clamping structure. The inner center adjustment assembly includes an axial positioning structure and a radial clamping structure. The scale positioning assembly includes a scale mounting groove, a clamping device, and a lifting ring; the support column assembly is bolted to the equipment turntable, the top connecting structure is clearance-fitted to the support cover plate assembly, and the angular bolts are used for clamping connection; the part is placed on the axial positioning plate of the inner centering assembly, the knob is adjusted to make the part, tooling, and turntable on the same rotation axis, and the outer centering adjustment assembly is adjusted to the appropriate position.

Images