A method for detecting composite material cascades

Abstract

This invention discloses a method for detecting composite material blade cascades, comprising the following steps: Step 1: clamping the composite material blade cascade; Step 2: selecting a measuring device and establishing a positioning coordinate system; Step 3: optically scanning the blade cascade profile, then importing the model and matching the coordinate system, and finally generating the theoretical coordinate values ​​of the blade cascade profile points; Step 4: creating an iterative program for the points, editing the iterative program in the blade cascade measurement program, generating a report and saving the measurement program; Step 5: replacing the blade cascade and automatically measuring the blade cascade. This detection process is simple, the measurement program is highly versatile, and the operation is convenient. It can realize automatic measurement of blade cascades, improve work efficiency, and reduce labor intensity.

Description

Technical Field

[0001] This invention belongs to the field of geometric dimension detection technology, and specifically relates to a method for detecting composite material blade cascades. Background Technology

[0002] Generally, random inspections of composite blade cascades only require checking critical dimensions such as the position of the mounting holes, without inspecting the dimensions of the blade cascade grid surface. However, with increasing requirements, it is necessary to conduct full-dimensional acceptance of composite blade cascades based on three-dimensional digital models to ensure that the thrust reverser force value meets the requirements.

[0003] Currently, contact-type coordinate measuring machines (CMMs) are generally used to inspect blade cascades. The blade cascades are positioned using simple positioning fixtures assembled from V-blocks or CMM auxiliary positioning plates and positioning stakes (e.g.,...). Figure 1 (As shown). The disadvantages of this measurement method and fixing method are that the contact coordinate measuring machine can only measure one scanning line within the blade grid, resulting in incomplete data. Programming a test program for one blade requires more than 22 hours, and subsequent programs for testing one blade require more than 4 hours, leading to long programming and testing times. Furthermore, the simple combination fixture exhibits significant positional differences after replacing the blade, making repeatable positioning measurements impossible.

[0004] A rapid detection device and method for the precision of gas turbine blades, disclosed in CN101694374B, is described. The device uses a blade positioning device to position the blade to be tested. A contour measuring device is symmetrically arranged on both sides of the blade positioning device to collect contour data of the blade cross section. This invention greatly reduces the workload of acquiring blade surface data. It is less affected by human factors and has a fast data acquisition speed. However, the clamping and adjustment of this invention is complex and has low automation. Summary of the Invention

[0005] To address the aforementioned problems, this invention aims to provide a method for detecting composite material cascades.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a method for detecting composite material cascades, comprising the following steps,

[0007] Step 1: Clamping the composite material blade cascade;

[0008] Step 2: Select the measuring equipment and establish the positioning coordinate system;

[0009] Step 3: Optically scan the blade cascade surface, then import the model and match the coordinate system, and finally generate the theoretical coordinate values ​​of the blade cascade surface points;

[0010] Step 4: Create an iterative program for the points. Edit the iterative program for the points in the cascade measurement program, generate a report, and save the measurement program.

[0011] Step 5: Replace the blade cascade and automatically measure the blade cascade.

[0012] Preferably, the fixture used in step 1 includes a fixed frame, a support column, and a V-block, with the V-block clamping the sides of the composite material blade cascade from multiple directions.

[0013] Preferably, two support columns are installed above the crossbeam of the fixed frame. The first support column on one side of the fixed frame is equipped with two fixed V-blocks, and the second support column on the other side of the fixed frame is equipped with a U-shaped support seat (8). The height of the U-shaped support seat is adjusted by bolts. The U-shaped support seat is equipped with an adjustable V-block. The adjustable V-block is fixed and stabilized on the right side of the blade assembly by screws.

[0014] Preferably, the measuring device in step 2 is a coordinate measuring machine with linear optical scanning;

[0015] The specific steps for establishing the positioning coordinate system are as follows: Replace and calibrate the contact ball probe, use the top plane of the first support column as the reference plane to perform coordinate system Z+ alignment, and clear the Z origin to zero. Measure line 1 on the left end face of the first support column, rotate line 1 in the coordinate system X+, measure line 2 on the front end face of the first side support column, and obtain point 1 by the intersection of line 1 and line 2. Clear the X and Y origins of point 1 to zero, thus completing the establishment of the positioning coordinate system.

[0016] Preferably, the optical scanning of the blade grating profile in step 3 is as follows: replace the linear optical scanning probe and calibrate the probe direction; scan and measure the overall blade grating profile from both the front and rear sides; complete the scanning of all positions of the blade grating through different angle directions; and add a safe movement position during the scanning process to prevent collisions.

[0017] Then, the UG model of the blade cascade is imported into the coordinate measuring machine. The operation is performed in the operation window to complete the final matching of the scan data and the model coordinate system, and a color difference map is generated.

[0018] Finally, the measurement points are manually distributed on the blade cascade digital model, and the spatial coordinates and vector direction coordinates of the points are obtained. A TXT format file is generated and saved.

[0019] The preferred iterative procedure for the points is as follows:

[0020] Step 41: Open the file in the specified location;

[0021] Step 42: Read the row data, and read the theoretical coordinate values ​​of the facet points row by row;

[0022] Step 43: Read the row data in a loop, starting from row 1 and ending at row 1056;

[0023] Step 44: Assign the read row data to TX, TY, TZ, TI, TJ, and TK in the program points respectively;

[0024] Step 45: The theoretical value and the actual value are evaluated by the coordinate position of the point to obtain the coordinate deviation value of the point.

[0025] Preferably, step 5 is as follows: After the blade grating size detection is completed, loosen the screw, adjust the V-block to the rightmost position, remove the blade grating, replace it with a new blade grating, fix the left mounting edge of the blade grating in the left fixing V-block of the fixture, place the bottom mounting edge of the blade grating on the top surface of the two support columns, fix the adjustable V-block to the right mounting edge of the blade grating, tighten the screw, and complete the replacement of the same type of blade grating. Then place the cursor in front of the optical scanning blade grating program, and automatically run the measurement program from the cursor position.

[0026] Compared with the prior art, the present invention has the following advantages: the detection process is simple, the measurement program is highly versatile, the operation is convenient, it can realize automatic measurement of the blade cascade, improve work efficiency, and reduce labor intensity. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the composite material blade cascade detection method in this invention;

[0029] Figure 2 This is a schematic diagram of the composite material blade cascade clamped in the detection and positioning fixture of the present invention. Figure 1 ;

[0030] Figure 3 This is a schematic diagram of the composite material blade cascade clamped in the detection and positioning fixture of the present invention. Figure 2 ;

[0031] Figure 4 This is a schematic diagram of the positioning coordinate system program generating the leaf cascade according to the present invention;

[0032] Figure 5 This is a scan of the blade cascade of the present invention;

[0033] Figure 6 This is a diagram of the theoretical coordinate values ​​of the curved surface points of this invention;

[0034] Figure 7 The iterative point program of this invention generates leaf cascade diagrams.

[0035] In the diagram, 1-longitudinal support block; 2-fixed frame; 3-support column; 4-nut; 5-first support column; 6-fixed V-block; 7-second support column; 8-U-shaped support seat; 9-bolt; 10-adjustable V-block; 11-screw. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0037] A method for detecting the lattice profile of a composite material blade cascade includes the following steps:

[0038] 1.Reference Figures 1-3 The combined positioning fixture consists of: A longitudinal support block 1 at the bottom of the crossbeam of the fixed frame 2, used to raise the clamping height of the blade cassette and stabilize the fixture. Two support columns 3 are mounted above the crossbeam of the fixed frame 2, providing stability to the blade cassette. The height of the support columns 3 can be adjusted via nuts 4, and the tops of the columns are wrapped with anti-collision tape to prevent damage to the blade cassette. Two fixing V-blocks 6 are mounted on the first support column 5 of the fixed frame 2, used to stabilize the left side of the blade cassette mounting edge. The V-blocks are also wrapped with anti-collision tape to prevent damage to the blade cassette. A U-shaped support seat 8 is mounted on the second support column 7 of the fixed frame 2. The height of the U-shaped support seat 8 can be adjusted via bolts 9. An adjustable V-block 10 is mounted on the U-shaped support seat 8, which stabilizes the right side of the blade cassette mounting edge via screws 11. The V-block is also wrapped with anti-collision tape to prevent damage to the blade cassette. Simultaneously, the position of the V-block 10 can be fixed by adjusting the V-block 10 via the U-shaped support seat 8, preventing the V-block 10 from obstructing the mounting edge holes.

[0039] 2. Clamping the composite material blade cascade: When clamping the blade cascade, first adjust the V-block 10 to the rightmost position to prevent scratching the parts, and loosen the bolt 9 to allow the U-shaped support 8 to be in a free state. Fix the left mounting edge of the blade cascade in the left fixing V-block 6 of the fixture, and then place the bottom mounting edge of the blade cascade on the two support columns 3. Adjust the height of the blade cascade by turning the nut 4, and adjust the left mounting edge of the blade cascade to a suitable position on the left fixing V-block 6 of the fixture (the suitable position is one that does not obstruct the mounting edge hole and is convenient for fixing). Adjust the position of the U-shaped support 8 so that the adjustable V-block 10 is fixed in a suitable position on the right mounting edge of the blade cascade, tighten the bolt 9 and the screw 11, and the blade cascade clamping is complete.

[0040] 3. Select measurement equipment: a coordinate measuring machine with linear optical scanning (e.g., Hexagon GlobalAdvantage 15.22.10).

[0041] Reference Figures 4-7 ,

[0042] 4. Establish the positioning coordinate system: Replace and calibrate the contact ball probe. Use the top plane 1 of the first support column 5 as the reference plane to perform coordinate system Z+ alignment, and reset the Z origin to zero. Measure line 1 on the left end face of the first support column 5, rotate line 1 in the coordinate system X+, and measure line 2 on the front end face of the first support column 5. The intersection of line 1 and line 2 yields point 1. Reset the X and Y origins of point 1 to zero, thus completing the establishment of the positioning coordinate system.

[0043] 5. Optical scanning of the blade profile: Replace the linear optical scanning probe and calibrate the probe direction. Scan and measure the overall blade profile from both the front and rear sides. Complete the scanning of all positions of the blade profile through different angle directions and add a safe movement position during the scanning process to prevent collisions.

[0044] 6. Import Model and Match Coordinate System: Import the blade cascade UG model into the coordinate measuring machine. In the X negative view, click "Cloud Operation," and in the operation window, select the "Select" command. Select the redundant scanned parts outside the blade cascade parts, select "External," and click "Create" to complete the initial deletion of redundant scanned data. Click "Point Cloud Coordinate System," and in the operation window, select "Automatic Calculation," "Refinement Calculation," and confirm to complete the initial matching of scanned data and the digital model. Click "Point Cloud Operation," and in the operation window, select "Clear," enter "2" for the maximum distance, and click Apply to clear redundant objects in the scanned data. Click "Filter," and in the operation window, select "Incident Angle 75º" and apply to clear redundant objects at the boundaries of the scanned data. Click "Cloud Coordinate System," and in the operation window, select "Automatic Calculation," "Refinement Calculation," and confirm to complete the final matching of the scanned data and the model coordinate system, and generate a color difference map.

[0045] 7. Generate theoretical coordinate values ​​of blade cascade surface points: Manually distribute measurement points on the blade cascade digital model and obtain the spatial coordinate values ​​and vector direction coordinate values ​​of the points, generate a TXT format file and save it.

[0046] 8. Creating an iterative program for the points: Edit the iterative program for the points in the cascade measurement program, generate a report, and save the measurement program. The iterative program for the points is as follows:

[0047] FPTR = File / Open, E:\YSH\71-115\115.xyz, Read

[0048] (Note: This program statement is used to iterate and read the theoretical coordinate values ​​of the surface points, which is the location where the theoretical coordinate values ​​of the surface points saved in step 7 are saved.)

[0049] V1=file / read line, FPTR, {NO USE}

[0050] (Note: The function of this program statement is to iteratively click and read the theoretical coordinate values of the point-by-row type surface points)

[0051] V = Loop / Start, Identifier = Yes, Number = 1056, Start = 1, Skip =,

[0052] Offset: X-axis = 0, Y-axis = 0, Z-axis = 0, Angle = 0

[0053] (Note: The function of this program statement is to iterate the number of loop points, that is, the total number of surface points, the starting point of the loop, and the information of the points to be skipped)

[0054] V2 = File / Read Line, FPTR, {PNT_NAME}+“ ”+{TX}+“,”+{TY}+“,”+{TZ}+“,”+{TI}+“,”+{TJ}+“,”+{TK}

[0055] (Note: The function of this program statement is to iterate the order of reading the theoretical coordinate values of the surface points)

[0056] PNT_NAME = Feature / Laser / Surface Point / Default, Cartesian Coordinates

[0057] Theoretical Value / <TX, TY, TZ>, <TI, TJ, TK>

[0058] Actual Value / <369.9377, -21.2001,1003.335>, <-0.7128967,0.0209924, -0.<7009548>

[0059] Target Value / <TX, TY, TZ>, <TI, TJ, TK>

[0060] Capture = No

[0061] Display Feature Parameters = No

[0062] Display LASER Parameters = Yes

[0063] Reference Identifier = COP1

[0064] Sound = Off

[0065] Horizontal Clip = 2, Vertical Clip = 1

[0066] Outer Layer Removal = Off

[0067] Delete Points outside Normal = Off

[0068] ​(Note: This program is an iterative point measurement program. The theoretical value of the point is read from the TXT file saved in step 7, and the actual value of the point is obtained by actual measurement. The coordinate deviation value of the point can be obtained by evaluating the coordinate position of the point.)

[0069] 9. Replace the blade cascade: After the blade cascade size is checked, loosen the screw 11, adjust the adjustable V-block 10 to the rightmost position, remove the blade cascade, replace it with a new blade cascade, fix the left mounting edge of the blade cascade in the left fixing V-block 6 of the fixture, place the bottom mounting edge of the blade cascade on the top surface of the two support columns 3, fix the adjustable V-block 10 to the right mounting edge of the blade cascade, tighten the screw 11, and complete the replacement of the same model blade cascade.

[0070] 10. Automatic measurement of blade grating: Place the cursor before the optical scanning blade grating program and use the shortcut key "Ctrl+U" to automatically run the measurement program from the cursor position.

[0071] The present invention has provided a detailed description of a composite material cascade detection method. Specific examples have been used to illustrate the structure and working principle of the invention. The descriptions of the embodiments are merely for the purpose of helping to understand the method and core ideas of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A method for detecting composite material cascades, characterized in that: Includes the following steps, Step 1: Clamping the composite material blade cascade; Step 2: Select the measuring equipment and establish the positioning coordinate system; Step 3: Optically scan the blade profile, then import the model and match the coordinate system, and finally generate the theoretical coordinate values ​​of the blade profile points. Specifically, replace the linear optical scanning probe and calibrate the probe direction. Scan and measure the overall blade profile from both the front and rear sides. Complete the scanning of all positions of the blade profile through different angles and directions, and add a safe movement position during the scanning process to prevent collisions. Then, the UG model of the blade cascade is imported into the coordinate measuring machine. The operation is performed in the operation window to complete the final matching of the scan data and the model coordinate system, and a color difference map is generated. Finally, the measurement points are manually distributed on the cascade digital model, and the spatial coordinates and vector direction coordinates of the points are obtained. A TXT file is generated and saved. Step 4: Create an iterative program for the points. Edit the iterative program for the points in the cascade measurement program, generate a report, and save the measurement program, as follows: Step 41: Open the file in the specified location; Step 42: Read the row data, and read the theoretical coordinate values ​​of the facet points row by row; Step 43: Read the row data in a loop, starting from row 1 and ending at row 1056; Step 44: Assign the read row data to TX, TY, TZ, TI, TJ, and TK in the program points respectively; Step 45: The theoretical value and the actual value are evaluated by the coordinate position of the point to obtain the coordinate deviation value of the point; Step 5: Replace the blade cascade and automatically measure the blade cascade.

2. The composite material cascade detection method according to claim 1, characterized in that: The fixture used in step 1 includes a fixed frame (2), a support column (3), and a V-block. The V-block clamps the sides of the composite material blade cascade from multiple directions.

3. The composite material cascade detection method according to claim 2, characterized in that: Two support columns (3) are installed above the crossbeam of the fixed frame (2). Two fixed V-blocks (6) are installed on the first support column (5) on one side of the fixed frame (2). A U-shaped support seat (8) is installed on the second support column (7) on the other side of the fixed frame (2). The height of the U-shaped support seat (8) is adjusted by bolts (9). An adjustable V-block (10) is installed on the U-shaped support seat (8). The adjustable V-block (10) is fixed by screws (11) to make the right side of the blade cascade installation edge stable.

4. The composite material cascade detection method according to claim 1, characterized in that: The measuring device in step 2 is a coordinate measuring machine with linear optical scanning; The specific steps for establishing the positioning coordinate system are as follows: Replace and calibrate the contact ball probe, use the top plane 1 of the first support column (5) as the reference plane to perform coordinate system Z+ alignment, and clear the Z origin to zero. Measure line 1 on the left end face of the first support column (5), rotate line 1 in the coordinate system X+, measure line 2 on the front end face of the first support column (5), and obtain point 1 by the intersection of line 1 and line 2. Clear the X and Y origins of point 1 to zero, and complete the establishment of the positioning coordinate system.

5. The composite material cascade detection method according to claim 1, characterized in that: Step 5 is as follows: After the blade grating size detection is completed, loosen the screw (11), adjust the adjustable V-block (10) to the rightmost position, remove the blade grating, replace it with a new blade grating, fix the left mounting edge of the blade grating in the fixed V-block (6) on the left side of the fixture, place the bottom mounting edge of the blade grating on the top surface of the two support columns (3), fix the adjustable V-block (10) on the right mounting edge of the blade grating, tighten the screw (11), and complete the replacement of the same type of blade grating. Then place the cursor in front of the optical scanning blade grating program and automatically run the measurement program from the cursor position.

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