Composite material blade cascade detection method

Abstract

The invention discloses a composite material blade grid detection method which comprises the following steps: step 1, clamping a composite material blade grid; 2, measuring equipment is selected, and a positioning coordinate system is established; 3, optically scanning the blade grid profile, then importing the model and matching a coordinate system, and finally generating theoretical coordinate values of blade grid profile points; 4, creating an iterative program of the points, editing the iterative program of the points in the blade grid measurement program, generating a report and storing the measurement program; and 5, replacing the blade cascade and automatically measuring the blade cascade. The method is simple in detection process, high in measurement program universality, simple and convenient to operate, and capable of realizing automatic measurement of the blade grid, improving the working efficiency and reducing the labor intensity.

Description

Technical Field

[0001] The invention belongs to the technical field of geometrical dimension detection, and in particular relates to a composite material blade detection method. Background Art

[0002] Generally, random inspection of composite blades only needs to inspect key dimensions such as the position of the installation side holes, and does not inspect the surface dimensions of the blade grid. However, as the requirements increase, it is necessary to inspect the composite blades in full size according to the three-dimensional digital model to ensure that the reverse thrust value of the reverse thrust device meets the requirements.

[0003] At present, contact type three-coordinate measuring machine is generally used to detect blades, and the blade detection positioning is fixed by a simple positioning fixture assembled with V-blocks or three-coordinate auxiliary positioning plates and positioning piles (such as Figure 1 The disadvantage of this measurement method and fixing method is that the contact type three-dimensional coordinate measuring machine can only measure one scanning line in the blade grid, the detection data is incomplete, and it takes more than 22 hours to compile a detection program for one blade grid, and more than 4 hours to detect one blade in the subsequent program. The programming and program detection time is long. The position difference of the simple combination fixture is large after replacing the new blade grid, and it is impossible to achieve repeated positioning measurement.

[0004] A gas turbine blade accuracy rapid detection device and detection method with publication number CN101694374B is disclosed, in which a blade positioning device is used to position the measured blade; a contour measuring device is symmetrically arranged on both sides of the blade positioning device, and is used to collect contour data of the blade cross section. The invention greatly reduces the workload of obtaining blade body curved surface data; it is less affected by human factors and the data acquisition speed is fast; however, the invention has complex clamping and adjustment and low automation. Summary of the invention

[0005] In order to solve the above problems, the present invention aims to provide a composite material cascade detection method.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme: a composite material cascade detection method, comprising the following steps:

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

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

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

[0010] Step 4: Create an iteration program of points, edit the iteration program of points in the cascade measurement program, generate a report and save the measurement program;

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

[0012] Preferably, the fixture used in step 1 comprises a fixed frame, supporting columns and V-shaped blocks, and the V-shaped blocks clamp the sides of the composite material blade grid from multiple directions.

[0013] Preferably, two supporting columns are installed above the cross beam of the fixed frame, two fixed V-shaped blocks are installed on the first supporting column on one side of the fixed frame, and a U-shaped supporting seat (8) is installed on the second supporting column on the other side of the fixed frame, and the U-shaped supporting seat is height-adjustable by bolts, and an adjustable V-shaped block is installed on the U-shaped supporting seat, and the adjustable V-shaped block is fixed by a screw to stabilize the installation side of the right blade cascade.

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

[0015] The establishment of the positioning coordinate system is as follows: replace the contact spherical probe and calibrate it, use the top plane of the first support column as the reference plane to align the coordinate system Z+, and clear the Z origin. Measure straight line 1 with the left end face of the first support column, perform coordinate system X+ rotation on straight line 1, measure straight line 2 with the plane of the front end face of the first side support column, and get point 1 by intersecting straight line 1 and clear the X and Y origins of point 1 to complete the establishment of the positioning coordinate system.

[0016] Preferably, the optical scanning of the blade cascade profile in step 3 is as follows: replace the linear optical scanning probe and calibrate the probe direction, scan and measure the entire blade cascade profile from the front and rear sides, complete the scanning of all positions of the blade cascade at different angles and directions, and add a safe moving position during the scanning process to prevent collision;

[0017] Then import the cascade UG model into the three-dimensional coordinate measuring machine, operate in the operation window, complete the final matching of the scan data and the model coordinate system, and generate a color difference map;

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

[0019] Preferably, the iteration procedure of the points is as follows:

[0020] FPTR = File / Open, E:\YSH\71-115\115.xyz, Read

[0021] V1 = file / readline, FPTR, {NO USE}

[0022] VP = Loop / Start, Flag = Yes, Number = 1056, Start = 1, Skip =,

[0023] Offset: X-axis = 0, Y-axis = 0, Z-axis = 0, Angle = 0

[0024] V2 = File / Read Line, FPTR, {PNT_NAME} + "" + {TX} + "," + {TY} + "," + {TZ} + "," + {TI} + "," + {TJ} + "," + {TK}

[0025] PNT_NAME = Feature / Laser / Surface Point / Default, Cartesian Coordinates

[0026] Theoretical Values / <TX, TY, TZ>, <TI, TJ, TK>

[0027] Actual Values / <369.9377, -21.2001, 1003.335>, <-0.7128967, 0.0209924, -0.<7009548>

[0028] Target Values / <TX, TY, TZ>, <TI, TJ, TK>

[0029] Capture = No

[0030] Display Feature Parameters = No

[0031] Display LASER Parameters = Yes

[0032] Reference ID = COP1

[0033] Sound = Off

[0034] Horizontal Clip = 2, Vertical Clip = 1

[0035] Outer Layer Removal = Off

[0036] Delete Points outside Normal = Off.

[0037] Preferably, the specific steps of step 5 are as follows. After the cascade size detection is completed, loosen the screw, adjust the V-block to the rightmost position, remove the cascade, replace it with a new one, fix the left mounting edge of the cascade in the left fixed V-block of the fixture, place the bottom mounting edge of the cascade on the top surfaces of the two support columns, fix the adjustable V-block on the right mounting edge of the cascade, tighten the screw to complete the replacement of the same type of cascade, and then place the cursor in front of the optical scanning cascade program and automatically run the measurement program from the cursor position.

[0038] Compared with the prior art, the present invention has the following advantages: The detection process is simple, the measurement program has strong versatility, the operation is simple, it can realize automatic measurement of the cascade, improve work efficiency, and reduce labor intensity. Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings required for use 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 ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 It is a schematic diagram of the composite material cascade detection method of the present invention;

[0041] Figure 2 Schematic diagram of the composite blade cascade clamped by the detection and positioning fixture of the present invention Figure 1 ;

[0042] Figure 3 Schematic diagram of the composite blade cascade clamped by the detection and positioning fixture of the present invention Figure 2 ;

[0043] Figure 4 is a schematic diagram of a cascade generated by a positioning coordinate system program of the present invention;

[0044] Figure 5 is a cascade scan diagram of the present invention;

[0045] Figure 6 It is the theoretical coordinate value diagram of the surface point of the present invention;

[0046] Figure 7 It is the iterative point procedure of the present invention that generates the cascade diagram.

[0047] In the figure, 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-V-block. DETAILED DESCRIPTION

[0048] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0049] A composite material cascade grid surface detection method, the steps of which are:

[0050] 1.Reference Figure 1-Figure 3, Combined positioning fixture: A longitudinal support block 1 is installed at the bottom of the crossbeam of the fixed frame 2, which is used to raise the clamping height of the blade cascade and stabilize the fixture. Two support columns 3 are installed above the crossbeam of the fixed frame 2 to support the stability of the blade cascade. The height of the support column 3 can be adjusted through the nut 4, and the top of the column is wrapped with anti-collision tape to prevent the blade cascade from being bumped. Two fixed V-shaped blocks 6 are installed on the first support column 5 of the fixed frame 2 to fix the installation edge of the left blade cascade to be stable. The V-shaped blocks are wrapped with anti-collision tape to prevent the blade cascade from being bumped. A U-shaped support seat 8 is installed on the second support column 7 of the fixed frame 2. The U-shaped support seat 8 can adjust the height through the bolt 9. An adjustable V-shaped block 10 is installed on the U-shaped support seat 8. The adjustable V-shaped block 10 fixes the installation edge of the right blade cascade to be stable through the screw 11. The V-shaped block is wrapped with anti-collision tape to prevent the blade cascade from being bumped. At the same time, the U-shaped support seat 8 can adjust the V-shaped block 10 to fix the position of the parts to prevent the V-shaped block 10 from blocking the installation edge hole.

[0051] 2. Clamping composite blades: When clamping the blades, first adjust the V-block 10 to the rightmost position to prevent scratching of parts, and loosen the bolts 9 to make the U-shaped support seat 8 free. Fix the left installation edge of the blade in the V-block 6 fixed on the left side of the fixture, and then place the bottom installation edge of the blade on the two support columns 3. Adjust the height of the blade by turning the nuts 4, and adjust the left installation edge of the blade to the appropriate position of the V-block 6 fixed on the left side of the fixture (the appropriate position is the position that does not block the installation edge hole and is easy to fix). Adjust the position of the U-shaped support seat 8 so that the adjustable V-block 10 is fixed to the appropriate position of the right installation edge of the blade, tighten the bolts 9 and the screw 11, and the blade clamping is completed.

[0052] 3. Select the measuring device: a three-dimensional coordinate measuring machine with linear optical scanning (for example: Hexagon GLOBALADVANTAGE 15.22.10).

[0053] Reference Figure 4-Figure 7 ,

[0054] 4. Establish the positioning coordinate system: replace the contact spherical probe and calibrate it, use the plane 1 at the top of the first support column 5 as the reference plane to align the coordinate system Z+, and clear the Z origin. Measure the straight line 1 with the left end face of the first support column 5, perform the coordinate system X+ rotation on the straight line 1, and measure the straight line 2 with the plane of the front end face of the first support column 5. The straight line 1 intersects with the straight line 2 to obtain point 1, and clear the X and Y origins of point 1 to complete the establishment of the positioning coordinate system.

[0055] 5. Optically scan the blade surface: Replace the linear optical scanning probe and calibrate the probe direction, scan and measure the overall blade surface from the front and back, scan all positions of the blade at different angles and directions, and add safe moving positions during the scanning process to prevent collisions.

[0056] 6. Import the model and match the coordinate system: Import the cascade UG model into the three-dimensional coordinate measuring machine, click "Cloud Operation" in the X-negative view, select the "Select" command in the operation window, select the redundant scanned parts other than the cascade parts, select "Outside" and click "Create" to complete the preliminary deletion of redundant scanned data. Click "Point Cloud Coordinate System", select "Automatic Calculation", "Precise Calculation" and confirm in the operation window to complete the preliminary matching of the scanned data and the digital model. Click "Point Cloud Operation", select "Clear" in the operation window, enter "2" for the maximum distance, and click Apply to clear the redundant objects in the scanned data. Click "Filter", select "Incident Angle 75°" in the operation window and apply it to clear the redundant objects at the boundary of the scanned data. Click "Cloud Coordinate System", select "Automatic Calculation", "Precise Calculation" and confirm in the operation window to complete the final matching of the scanned data and the model coordinate system, and generate a color difference map.

[0057] 7. Generate theoretical coordinate values ​​of blade surface points: manually distribute measurement points on the blade digital model and obtain the spatial coordinate values ​​and vector direction coordinate values ​​of the points, generate a TXT format file and save it.

[0058] 8. Create point iteration program: Edit the point iteration program in the cascade measurement program, generate a report and save the measurement program. The point iteration program is as follows:

[0059] FPTR = File / Open, E:\YSH\71-115\115.xyz, Read (Note: This program statement is used to iterate the point to read the location of the theoretical coordinate value of the surface point, that is, the location where the theoretical coordinate value file of the surface point saved in step 7 is saved)

[0060] V1 = file / readline, FPTR, {NO USE}

[0061] (Note: The function of this program statement is to iterate point by line to read the theoretical coordinate values ​​of the surface points)

[0062] V P =Loop / Start, Flag=Yes, Number=1056, Start=1, Skip=,

[0063] Offset: X axis = 0, Y axis = 0, Z axis = 0, angle = 0

[0064] (Note: This program statement is used to iterate the number of point loops, that is, the total number of surface points, the loop start point, and the information of the points that need to be skipped)

[0065] V2 = file / readline, FPTR, {PNT_NAME}+""+{TX}+","+{TY}+","

[0066] +{TZ}+","+{TI}+","+{TJ}+","+{TK}

[0067] (Note: The function of this program statement is to iterate the order of reading the theoretical coordinate values of surface points)

[0068] PNT_NAME = Feature / Laser / Surface Point / Default, Cartesian coordinates

[0069] Theoretical value / <TX, TY, TZ>, <TI, TJ, TK>

[0070] Actual value / <369.9377, -21.2001, 1003.335>,

[0071] <-0.7128967, 0.0209924, -0.<7009548>

[0072] Target value / <TX, TY, TZ>, <TI, TJ, TK>

[0073] Capture = No

[0074] Display feature parameters = No

[0075] Display LASER parameters = Yes

[0076] Reference identifier = COP1

[0077] Sound = Off

[0078] Horizontal clipping = 2, Vertical clipping = 1

[0079] Outer layer removal = Off

[0080] Delete points outside the normal = Off (Note: This program is the measurement program for iterative points. The theoretical values of the points are obtained by reading from the saved TXT file in step 7, and the actual values of the points are obtained by actual measurement. Through the evaluation of the coordinate positions of the points, the coordinate deviation values of the points can be obtained)

[0081] 9. Replace the cascade: After the cascade size detection is completed, loosen the screw 11, adjust the V-block 10 to the rightmost position, remove the cascade, replace it with a new cascade, fix the left mounting edge of the cascade in the fixed V-block 6 on the left side of the fixture, place the bottom mounting edge of the cascade on the top surfaces of the two support columns 3, fix the adjustable V-block 10 on the right mounting edge of the cascade, and tighten the screw 11 to complete the replacement of the same type of cascade.

[0082] 10. Automatically measure the cascade: Place the cursor in front of the optical scanning cascade program, and use the shortcut key "Ctrl+U" to automatically run the measurement program from the cursor position.

[0083] The above is a detailed introduction to a composite material cascade detection method provided by the present invention. This article uses specific examples to illustrate the structure and working principle of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A composite material cascade detection method, characterized in that: The following steps are included: Step 1: Clamping the composite blade cascade; Step 2: Select the measuring device and establish the positioning coordinate system; Step 3: Optically scan the blade surface, then import the model and match the coordinate system, and finally generate the theoretical coordinate values ​​of the blade surface points; Step 4: Create an iteration program of points, edit the iteration program of points in the cascade measurement program, generate a report and save the measurement program; Step 5: Replace the blades and automatically measure the blades.

2. The composite material cascade detection method according to claim 1, characterized in that: The fixture used in step 1 comprises a fixing frame (2), a supporting column (3) and a V-shaped block, and the V-shaped block is used to clamp the side of the composite material blade grid from multiple directions.

3. The composite material cascade detection method according to claim 2, characterized in that: Two supporting columns (3) are installed above the crossbeam of the fixed frame (2); two fixed V-shaped blocks (6) are installed on the first supporting column (5) on one side of the fixed frame (2); a U-shaped supporting seat (8) is installed on the second supporting column (7) on the other side of the fixed frame (2); the height of the U-shaped supporting seat (8) is adjusted by bolts (9); an adjustable V-shaped block (10) is installed on the U-shaped supporting seat (8); the adjustable V-shaped block (10) is fixed to the right blade installation side by a screw (11) to stabilize it.

4. The composite material cascade detection method according to claim 1, characterized in that: The measuring device in step 2 is a three-dimensional coordinate measuring machine with linear optical scanning; The specific steps of establishing the positioning coordinate system are as follows: replace the contact spherical probe and calibrate it, use the plane 1 at the top of the first support column (5) as the reference plane to perform Z+ alignment of the coordinate system, and clear the Z origin. Use the left end face of the first support column (5) to measure straight line 1, perform X+ rotation of straight line 1, use the front end face of the first support column (5) to measure straight line 2, straight line 1 intersects with straight line 2 to obtain point 1, clear the X and Y origins of point 1, and complete the establishment of the positioning coordinate system.

5. The composite material cascade detection method according to claim 1, characterized in that: The optical scanning of the blade surface in step 3 is as follows: replace the linear optical scanning probe and calibrate the probe direction, scan and measure the entire blade surface from the front and rear sides, complete the scanning of all positions of the blade at different angles and directions, and add a safe moving position during the scanning process to prevent collision; Then import the cascade UG model into the three-dimensional coordinate measuring machine, operate in the operation window, complete the final matching of the scan data and the model coordinate system, and generate a color difference map; Finally, the measurement points are manually distributed on the blade cascade digital model and the spatial coordinate values ​​and vector direction coordinate values ​​of the points are obtained. A TXT format file is generated and saved.

6. The composite material cascade detection method according to claim 1, characterized in that: The iterative procedure of the points is as follows: FPTR = File / Open, E:\YSH\71-115\115.xyz, Read V1 = file / readline, FPTR, {NO USE} V P =Loop / Start, Flag=Yes, Number=1056, Start=1, Skip=, Offset: X axis = 0, Y axis = 0, Z axis = 0, angle = 0 V2 = file / readline, FPTR, {PNT_NAME}+""+{TX}+","+{TY}+","+{TZ}+","+{TI}+","+{TJ}+","+{TK} PNT_NAME = Feature / Laser / Surface Point / Default, Cartesian Coordinates Theoretical value / <TX,TY,TZ> ,<TI,TJ,TK> Actual value / <369.9377, -21.2001, 1003.335>, <-0.7128967,0.0209924，-0.7009548> Target value / <TX,TY,TZ> ,<TI,TJ,TK> capture=no Show Feature Parameters = No Show LASER parameters = Yes Reference ID = COP1 Sound = Off Horizontal Clip = 2, Vertical Clip = 1 Outer Layer_Remove = Off Delete points outside normals = Off.

7. The composite material cascade detection method according to claim 1, characterized in that: The step 5 is specifically as follows: after the blade size detection is completed, the screw rod (11) is loosened, the V-shaped block (10) is adjusted to the rightmost position, the blade is removed, and a new blade is replaced. The left mounting edge of the blade is fixed in the V-shaped block (6) on the left side of the fixture, the bottom mounting edge of the blade is placed on the top surfaces of the two supporting columns (3), the adjustable V-shaped block (10) is fixed to the right mounting edge of the blade, the screw rod (11) is tightened, and the same type of blade is replaced. Then, the cursor is placed in front of the optical scanning blade program, and the measurement program is automatically run from the cursor position.

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