A turbine working blade fir-tree tenon cross-bar digital positioning method and device

Abstract

The application provides a turbine working blade fir-tree tenon cross-bar digitized positioning method and device, the method comprises the following steps: S1, using left and right probe self-centering scanning function to respectively perform point sampling treatment on the tangent of the upper and lower tenon working surfaces on both sides of the tenon, to obtain relevant reference planes, combining the relevant reference planes and the right-hand rule of the Cartesian coordinate system, to obtain a blade accumulation axis center coordinate system; S2, using the self-centering scanning function of the probe of the customized three-coordinate measuring machine to calculate the tenon cross-bar distance based on the blade accumulation axis center coordinate system after tangency with the upper and lower tooth profile working surfaces, to complete accurate, automatic and digitized detection of the blade tenon cross-bar size. The application solves the shortcomings of the original method, such as unconfirmed positioning, poor consistency, long clamping time and the like, shortens the clamping time, saves the measurement preparation time, greatly improves the tenon cross-bar distance size detection and positioning accuracy, and improves the measurement efficiency and accuracy.

Description

Technical Field

[0001] This application relates to the field of aero-engine technology, and in particular, to a digital positioning method and device for the strut of the fir tree-shaped tenon of a turbine working blade. Background Technology

[0002] The turbine blades of small and medium-sized aero engines, such as helicopters and starters, mainly consist of a tenon, blade body, and blade crown. The tenon typically uses a fir tree tenon structure to connect with the turbine disk, meaning the tenon serves as the assembly and inspection benchmark for the blade. The stacked axis center of the blade is determined by the symmetry center of the two-stage working surfaces of the fir tree tenon.

[0003] In the machining of fir tree-shaped tenon blades, the measurement benchmark for precision blade feature geometric parameters such as blade shape, edge plate, flow channel, and blade crown is the center line of the blade stacking axis (i.e., the plane of symmetry between the two working surfaces of the tenon). Dimensional inspection is typically performed using the center plane of the tenon tooth crossbar (a standard round bar tangent to the tenon tooth working surface) (see...). Figure 1 Dimension ⑩). The precision of the blade's characteristic geometric dimensions is extremely high, with a maximum precision of 0.02mm. Due to the narrow (less than 1mm) positioning surface and long blade body of small engines, the ratio of the span bar distance to the blade height reaches 1:8. If the tenon span bar positioning is inaccurate, it will amplify the positioning error of the measured blade characteristic parameters. Therefore, the tenon positioning problem of fir tree-shaped blades has always been a difficult problem in the industry.

[0004] Currently, the tenon reference for turbine blades is established using a physical combination of standard rollers, fixtures, and the blade working surface (see...). Figure 2 First, the blade and pressure surface are tightened. Then, a probe is used to measure the extension of the gauge bar to establish a reference. The biggest drawback of this method is that during the blade alignment process, the parallelism of the tenon, the accuracy of the shape and size tolerances, the accuracy of the standard gauge bar, the wear of the fixture, human error, and the skill level of the operator all inevitably cause a loss of blade reference accuracy. Moreover, this accuracy loss is unquantifiable and unpredictable, resulting in poor blade positioning consistency and poor profile consistency.

[0005] The tenon-bar spacing (the distance between the standard measuring bar tangent to the two pressure surfaces) is a critical dimensional requirement for the mating with the turbine disk tenon groove, demanding high precision (0.03mm) and requiring 100% inspection during manufacturing. Currently, the blade tenon-bar spacing is measured manually using a micrometer and roller. The micrometer's resolution is only 0.01mm, which cannot meet the requirement of 1 / 4 of the tenon-bar spacing tolerance (0.03mm), and it is also subject to human error, resulting in low efficiency. Summary of the Invention

[0006] To address the aforementioned technical problems, this application provides a method for digitally positioning the strut of the fir tree tenon of a turbine working blade.

[0007] The technical solution adopted in this application is as follows:

[0008] A method for digitally positioning the strut of the fir tree-shaped tenon of a turbine working blade includes the following steps:

[0009] S1. Using the self-centering scanning function of the left and right probes, multiple points are sampled on the working surfaces of the upper and lower tenons on both sides of the tenon to obtain relevant reference planes. Combining the relevant reference planes and the right-hand rule of the Cartesian coordinate system, the coordinate system of the blade stacking axis center is obtained.

[0010] S2. Utilizing the self-centering scanning function of the probe of the customized coordinate measuring machine, and after tangent to the upper and lower tooth profile working surfaces of the tenon, the tenon span distance based on the coordinate system of the blade stacking axis center is calculated, thus completing the accurate, automatic, and digital detection of the blade tenon span size.

[0011] Furthermore, step S2 specifically includes the following steps:

[0012] S21. The probe of the customized coordinate measuring machine is tangent to the upper and lower tooth working surfaces of the tenon using its self-centering scanning function. The diameter of the spherical probe is the same as the diameter of the standard measuring rod.

[0013] S22. Using a probe to simulate the actual rolling bar, scan the corresponding tooth grooves on the left and right sides of the tenon.

[0014] S23. Record the center coordinates of the left and right probes based on the coordinate system of the blade stacking axis and calculate the distance value. Then add the probe diameter to obtain the span distance of the tenon, thus completing the accurate, automatic and digital detection of the span size of the blade tenon.

[0015] Furthermore, step S1 specifically includes the following steps:

[0016] S11. Using the self-centering scanning function of the left and right probes, sampling points are taken at multiple tangent points on the working surfaces of the upper and lower tenons on both sides of the tenon, and the center coordinates of the probes located at each sampling point are recorded.

[0017] S12. Construct a symmetrical first plane A1 and a second plane A2 on both sides of the tenon, wherein the first plane A1 is tangent to the outer circle of the spherical probe of the probe located at each sampling point on one side of the tenon, and the first plane A1 is tangent to the outer circle of the spherical probe of the probe located at each sampling point on the other side of the tenon.

[0018] S13. Construct the center plane A3 of symmetry between the first plane A1 and the second plane A2;

[0019] S14. Construct a third plane B3, which is perpendicular to the symmetry center plane A3 and tangent to the lowest point of the spherical probe of the probe located at the lowest sampling point on both sides of the tenon.

[0020] S15. Determine the coordinate system of the blade stacking axis center based on the constructed symmetry center plane A3 and the third plane B3.

[0021] Furthermore, step S15 specifically includes the following steps:

[0022] S151. Construct an axial direction X based on the intersection line of the symmetry center plane A3 and the third plane B3, and take the direction of the axial direction X pointing to the trailing edge of the blade as the positive direction;

[0023] S152. Based on the square and Cartesian coordinate system right-hand rule of the axis X, the coordinate system (X, Y, Z) of the blade stacking axis center is obtained.

[0024] Furthermore, in the coordinate system of the blade stacking axis center, the positive direction of the axial direction Y points to the back of the blade, and the positive direction of the axial direction Z points to the tip of the blade.

[0025] Furthermore, in step S11, the self-centering scanning function of the left and right probes is used to collect data at at least four points on the working surfaces of the upper and lower tenons on each side of the tenon, and the center coordinates of the probes located at each sampling point are recorded.

[0026] This application also provides a digital positioning device for the strut of the fir tree tenon of a turbine working blade, comprising:

[0027] The tenon coordinate system establishment module is used to obtain relevant reference planes by using the self-centering scanning function of the left and right probes to perform multi-point sampling on the working surfaces of the upper and lower tenons on both sides of the tenon. Combined with the relevant reference planes and the right-hand rule of the Cartesian coordinate system, the coordinate system of the blade stacking axis center is obtained.

[0028] The tenon span digital detection module is used to calculate the tenon span based on the coordinate system of the blade stacking axis center by using the self-centering scanning function of the probe of a customized coordinate measuring machine and tangent to the upper and lower tooth profile working surfaces of the tenon. This completes the accurate, automatic and digital detection of the blade tenon span size.

[0029] Furthermore, the bar spacing digital detection module includes:

[0030] The tenon self-centering scanning module is used to utilize the self-centering scanning function of the probe of a customized coordinate measuring machine to make it tangent to the upper and lower tooth profile working surfaces of the tenon. The diameter of the spherical probe is the same as the diameter of the standard measuring rod.

[0031] The left and right tooth groove scanning module is used to scan the corresponding tooth grooves on the left and right sides of the tenon teeth respectively by simulating the actual rolling bar with a probe;

[0032] The tenon span dimension detection module is used to record the center coordinates of the left and right probes based on the coordinate system of the blade stacking axis center, calculate the distance value, and add the probe diameter to obtain the tenon span distance, thus completing the accurate, automatic and digital detection of the blade tenon span dimension.

[0033] Furthermore, the tenon coordinate system establishment module includes:

[0034] The multi-point sampling module is used to collect samples at multiple tangential points on the upper and lower tenon working surfaces on both sides of the tenon using the self-centering scanning function of the left and right probes, and to record the center coordinates of the probes located at each sampling point.

[0035] A symmetrical plane construction module is used to construct a first plane A1 and a second plane A2 on both sides of the tenon, wherein the first plane A1 is tangent to the outer circle of the spherical probe of the probe located at each sampling point on one side of the tenon, and the first plane A1 is tangent to the outer circle of the spherical probe of the probe located at each sampling point on the other side of the tenon.

[0036] A symmetry center plane construction module is used to construct the symmetry center plane A3 of the first plane A1 and the second plane A2;

[0037] The third plane construction module is used to construct the third plane B3, which is perpendicular to the symmetry center plane A3 and tangent to the lowest point of the spherical probe of the probe located at the lowest sampling point on both sides of the tenon.

[0038] The blade stacking axis center coordinate system construction module is used to determine the blade stacking axis center coordinate system based on the constructed symmetry center plane A3 and the third plane B3.

[0039] Furthermore, the blade stacking axis center coordinate system construction module includes:

[0040] The axial X construction module is used to construct the axial X based on the intersection line of the symmetry center plane A3 and the third plane B3, with the direction of the axial X pointing towards the trailing edge of the blade as the positive direction;

[0041] The coordinate system construction module is used to obtain the coordinate system (X, Y, Z) of the blade stacking axis center based on the square and Cartesian coordinate system right-hand rule of the X-axis.

[0042] This application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the digital positioning method for the crossbar of the fir tree tenon of the turbine working blade.

[0043] This application also provides a storage medium including a stored program that, when the program is executed, controls the device where the storage medium is located to perform the steps of the digital positioning method for the turbine working blade fir tree tenon strut.

[0044] Compared with the prior art, this application has the following advantages:

[0045] This application provides a digital positioning method and device for the span bar of the fir tree-shaped tenon of a turbine working blade. The method includes the following steps: S1, using the self-centering scanning function of the probe of a customized coordinate measuring machine to calculate the span bar distance of the tenon after tangenting it to the upper and lower tooth working surfaces of the tenon, thus completing the accurate, automatic and digital detection of the span bar size of the blade tenon; S2, using the self-centering scanning function of the left and right probes to perform point sampling processing at multiple points tangent to the upper and lower tenon working surfaces on both sides of the tenon to obtain relevant reference planes, and combining the relevant reference planes and the right-hand rule of the Cartesian coordinate system to obtain the coordinate system of the blade stacking axis center.

[0046] Compared with existing technologies, this application has the following advantages:

[0047] a. This application employs a custom-designed probe, utilizing its "balanced" position for precise positioning of the tenon roller. This constructs a virtual roller baseline to establish the blade stacking axis center reference. By overcoming the problems of the original physical roller's cylindricity difference (0.005mm), variability, and uncontrollable manual clamping force, it achieves efficient and accurate positioning of the blade tenon reference and significantly improves the accuracy of tenon spacing dimension detection and positioning. The spacing dimension accuracy was verified using standard gauge blocks, a lever micrometer, and standard rollers. The dimensional deviation was within 0.002mm. Analysis using the MSA measurement system showed a %Gage R&R of 7.58% (<10%), verifying the acceptableness of this measurement method.

[0048] b. This application uses a customized coordinate probe to replace the physical roller, which solves the shortcomings of the original method such as unconfirmed positioning, poor consistency, and long clamping time. The clamping time is shortened by 3 times, which greatly saves measurement preparation time.

[0049] c. This application has implemented an adaptive digital reference positioning method for tenons and cross-bar spacing dimension detection, laying a digital positioning foundation for matrix batch detection of turbine blades and automated detection with robotic arms.

[0050] d. This application realizes the merging of turbine blade inspection processes. The original method required manual inspection of the cross-bar spacing using a micrometer. With this method, the cross-bar spacing dimension specified in the drawing can be inspected at the same time as the tenon datum is established during the blade profile inspection process, which greatly saves the time of switching processes.

[0051] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. The application will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0052] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0053] Figure 1 This is a schematic flowchart of a preferred embodiment of the digital positioning method for the strut of the fir tree-shaped tenon of the turbine working blade in this application.

[0054] Figure 2 This is a flowchart illustrating a sub-step of step S1 in a preferred embodiment of this application.

[0055] Figure 3 This is a flowchart illustrating a sub-step of step S15 in a preferred embodiment of this application.

[0056] Figure 4 This is a schematic diagram of the coordinate system of the blade stacking axis center in a preferred embodiment of this application.

[0057] Figure 5 This is a flowchart illustrating a sub-step of step S2 in a preferred embodiment of this application.

[0058] Figure 6 This is a schematic diagram of the digital positioning device module for the turbine working blade fir tree tenon strut crossbar according to a preferred embodiment of this application.

[0059] Figure 7 A schematic diagram of a sub-module of the cross-bar spacing digital detection module in a preferred embodiment of this application.

[0060] Figure 8 This is a schematic diagram of a submodule of the tenon coordinate system establishment module in a preferred embodiment of this application.

[0061] Figure 9 This is a schematic diagram of a submodule of the blade stacking axis center coordinate system construction module in a preferred embodiment of this application.

[0062] Figure 10 This is a schematic diagram of digital detection of the span distance according to a preferred embodiment of this application.

[0063] Figure 11 This is a schematic block diagram of an electronic device according to a preferred embodiment of this application.

[0064] Figure 12 This is an internal structural diagram of a computer device according to a preferred embodiment of this application. Detailed Implementation

[0065] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0066] Reference Figure 1 A preferred embodiment of this application provides a method for digitally positioning the strut of the fir tree-shaped tenon of a turbine working blade, comprising the following steps:

[0067] S1. Using the self-centering scanning function of the left and right probes, multiple points are sampled on the working surfaces of the upper and lower tenons on both sides of the tenon to obtain relevant reference planes. Combining the relevant reference planes and the right-hand rule of the Cartesian coordinate system, the coordinate system of the blade stacking axis center is obtained.

[0068] S2. Utilizing the self-centering scanning function of the probe of the customized coordinate measuring machine, and after tangent to the upper and lower tooth profile working surfaces of the tenon, the tenon span distance based on the coordinate system of the blade stacking axis center is calculated, thus completing the accurate, automatic, and digital detection of the blade tenon span size.

[0069] The self-centering scanning technology works by utilizing the high-speed, continuous data acquisition and direct determination of the two-dimensional vector direction at the contact point by a three-coordinate analog probe sensor. When measuring the center of a specific inner surface (such as a V-groove, tapered hole, gear groove, etc.), the three-dimensional analog probe performs vector point scanning search on the inner surface. When the probe senses an imbalance in the measuring force, it adjusts the force changes and probe vector position on both axes (X-axis and Y-axis) in real time until the measuring forces on both sides of the sensor reach equilibrium, at which point the coordinates of the equilibrium point are read (see...). Figure 3 As shown), the center of the V-groove is found in an adaptive manner.

[0070] Compared with existing technologies, this application has the following advantages:

[0071] a. This embodiment uses a customized probe to precisely locate the tenon roller position using the probe's "balance" position. This constructs a virtual roller baseline to establish the blade stacking axis center reference. By overcoming the problems of the original physical roller's cylindricity difference (0.005mm), variability, and uncontrollable manual clamping force, it achieves efficient and accurate positioning of the blade tenon reference and significantly improves the accuracy of tenon spacing dimension detection and positioning. The spacing dimension accuracy was verified using standard gauge blocks, a lever micrometer, and standard rollers. The dimensional deviation was within 0.002mm. Analysis using the MSA measurement system showed a %Gage R&R of 7.58% (<10%), verifying the acceptableness of this measurement method.

[0072] b. In this embodiment, a customized three-coordinate probe is used to replace the physical roller, which solves the shortcomings of the original method, such as unconfirmed positioning, poor consistency, and long clamping time. The clamping time is shortened by 3 times, which greatly saves the measurement preparation time.

[0073] c. This embodiment realizes the adaptive digital reference positioning method for tenons and the detection of span distance, laying a digital positioning foundation for the matrix batch detection of turbine blades and the automated detection with the cooperation of robotic arms.

[0074] d. This embodiment realizes the merging of turbine blade inspection processes. The original method required manual inspection of the cross-bar spacing using a micrometer. With this method, the cross-bar spacing dimension specified in the drawing can be inspected at the same time as the tenon datum is established during the blade profile inspection process, which greatly saves the switching time.

[0075] Specifically, such as Figure 2 and Figure 4 As shown, the specific steps of step S1 are as follows:

[0076] S11. Using the self-centering scanning function of the left and right probes, sampling points are taken at multiple tangent points on the working surfaces of the upper and lower tenons on both sides of the tenon, and the center coordinates of the probes located at each sampling point are recorded.

[0077] S12. Construct a symmetrical first plane A1 and a second plane A2 on both sides of the tenon, wherein the first plane A1 is tangent to the outer circle of the spherical probe of the probe located at each sampling point on one side of the tenon, and the first plane A1 is tangent to the outer circle of the spherical probe of the probe located at each sampling point on the other side of the tenon.

[0078] S13. Construct the center plane A3 of symmetry between the first plane A1 and the second plane A2;

[0079] S14. Construct a third plane B3, which is perpendicular to the symmetry center plane A3 and tangent to the lowest point of the spherical probe of the probe located at the lowest sampling point on both sides of the tenon.

[0080] S15. Determine the coordinate system of the blade stacking axis center based on the constructed symmetry center plane A3 and the third plane B3.

[0081] Specifically, such as Figure 3 and Figure 4 As shown, step S15 specifically includes the following steps:

[0082] S151. Construct an axial direction X based on the intersection line of the symmetry center plane A3 and the third plane B3, and take the direction of the axial direction X pointing to the trailing edge of the blade as the positive direction;

[0083] S152. Based on the square and Cartesian coordinate system right-hand rule of the X-axis, the coordinate system (X, Y, Z) of the blade stacking axis center is obtained.

[0084] Specifically, such as Figure 4As shown, in the coordinate system of the blade stacking axis center, the positive direction of the axial direction Y points to the back of the blade, and the positive direction of the axial direction Z points to the tip of the blade.

[0085] Specifically, in step S11, the left and right probes are used to perform self-centering scanning at at least four points on the upper and lower tenon working surfaces on each side of the tenon, and the center coordinates of the probes at each sampling point are recorded, thereby ensuring the accurate construction of the symmetrical center plane A3 of the first plane A1 and the second plane A2.

[0086] Specifically, such as Figure 5 As shown, step S2 specifically includes the following steps:

[0087] S21. The probe of the customized coordinate measuring machine is tangent to the upper and lower tooth working surfaces of the tenon using its self-centering scanning function. The diameter of the spherical probe is the same as the diameter of the standard measuring rod.

[0088] S22. Using a probe to simulate the actual rolling bar, scan the corresponding tooth grooves on the left and right sides of the tenon.

[0089] S23. Record the center coordinates of the left and right probes based on the coordinate system of the blade stacking axis and calculate the distance value. Then add the probe diameter to obtain the span distance of the tenon, thus completing the accurate, automatic and digital detection of the span size of the blade tenon.

[0090] like Figure 6 As shown, another preferred embodiment of this application also provides a digital positioning device for the strut of the fir tree-shaped tenon of a turbine working blade, comprising:

[0091] The tenon coordinate system establishment module is used to obtain relevant reference planes by using the self-centering scanning function of the left and right probes to perform multi-point sampling on the working surfaces of the upper and lower tenons on both sides of the tenon. Combined with the relevant reference planes and the right-hand rule of the Cartesian coordinate system, the coordinate system of the blade stacking axis center is obtained.

[0092] The tenon span digital detection module is used to calculate the tenon span based on the coordinate system of the blade stacking axis center by using the self-centering scanning function of the probe of a customized coordinate measuring machine and tangent to the upper and lower tooth profile working surfaces of the tenon. This completes the accurate, automatic and digital detection of the blade tenon span size.

[0093] Specifically, such as Figure 7 As shown, the bar spacing digital detection module includes:

[0094] The tenon self-centering scanning module is used to utilize the self-centering scanning function of the probe of a customized coordinate measuring machine to make it tangent to the upper and lower tooth profile working surfaces of the tenon. The diameter of the spherical probe is the same as the diameter of the standard measuring rod.

[0095] The left and right tooth groove scanning module is used to scan the corresponding tooth grooves on the left and right sides of the tenon teeth respectively by simulating the actual rolling bar with a probe;

[0096] The tenon span dimension detection module is used to record the center coordinates of the left and right probes based on the coordinate system of the blade stacking axis center, calculate the distance value, and add the probe diameter to obtain the tenon span distance, thus completing the accurate, automatic and digital detection of the blade tenon span dimension.

[0097] Specifically, such as Figure 8 As shown, the tenon coordinate system establishment module includes:

[0098] The multi-point sampling module is used to collect samples at multiple tangential points on the upper and lower tenon working surfaces on both sides of the tenon using the self-centering scanning function of the left and right probes, and to record the center coordinates of the probes located at each sampling point.

[0099] A symmetrical plane construction module is used to construct a first plane A1 and a second plane A2 on both sides of the tenon, wherein the first plane A1 is tangent to the outer circle of the spherical probe of the probe located at each sampling point on one side of the tenon, and the first plane A1 is tangent to the outer circle of the spherical probe of the probe located at each sampling point on the other side of the tenon.

[0100] A symmetry center plane construction module is used to construct the symmetry center plane A3 of the first plane A1 and the second plane A2;

[0101] The third plane construction module is used to construct the third plane B3, which is perpendicular to the symmetry center plane A3 and tangent to the lowest point of the spherical probe of the probe located at the lowest sampling point on both sides of the tenon.

[0102] The blade stacking axis center coordinate system construction module is used to determine the blade stacking axis center coordinate system based on the constructed symmetry center plane A3 and the third plane B3.

[0103] Specifically, such as Figure 9 As shown, the blade stacking axis center coordinate system construction module includes:

[0104] The axial X construction module is used to construct the axial X based on the intersection line of the symmetry center plane A3 and the third plane B3, with the direction of the axial X pointing towards the trailing edge of the blade as the positive direction;

[0105] The coordinate system construction module is used to obtain the coordinate system (X, Y, Z) of the blade stacking axis center based on the square and Cartesian coordinate system right-hand rule of the X-axis.

[0106] The following section uses the digital detection process across bar spacing as an example to further illustrate this application.

[0107] Measure the tenon-bar spacing within the measurement section specified on the blade drawing. A typical inspection example is shown below. Figure 10 In this embodiment, the digital detection method for the span distance of the blade tenon span bar in the above embodiments of this application is used to detect the span distance of the upper and lower sets of tenon teeth on the blade fir tree tenon, and the results are as follows. Figure 10 The dimensions P (span distance of the upper tenon) and M (span distance of the lower tenon) are shown. Specifically, taking dimension P as an example, the center axis of the probe spheres on both sides is obtained by using a self-centering scanning method on the two corresponding tenons on the left and right sides. The distance between the corresponding points of the two axes projected onto the third plane B3 plus the diameter of the probe head is the span distance dimension P. The measurement process of dimension M is similar and will not be described in detail here.

[0108] In addition, the positioning method of this application has the following characteristics:

[0109] 1. The sphericity and diameter of the custom probes are required to be high, and both must be controlled within 0.0005mm.

[0110] 2. During self-centering scanning, parameters such as scanning force, retraction distance, and point density should be set reasonably according to the tenon space, angle, and different probe diameters to ensure measurement accuracy and efficiency.

[0111] 3. During the establishment of the tenon datum, the plane and axis fitting should be performed reasonably in strict accordance with the Cartesian coordinate system establishment method, and the coordinates of the side sphere center should be ensured to fall on the effective entity of the blade tenon to avoid the extension error caused by the non-parallelism of the axis.

[0112] 4. The technical solution designed in this application has universal applicability and is applicable to the positioning of fir tree-shaped tenons and the detection of span distance of turbine working blades of various sizes. It can also be extended to the positioning and detection of dovetail-shaped tenons of compressor blades, and has strong promotional value.

[0113] like Figure 11 As shown, another preferred embodiment of this application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of the digital positioning method for the turbine working blade fir tree tenon strut in the above embodiment.

[0114] like Figure 12 As shown, another preferred embodiment of this application also provides a computer device, which may be a terminal or a liveness detection server, and its internal structure diagram may be as follows. Figure 12As shown. The computer device includes a processor, memory, and a network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The network interface is used to communicate with other external computer devices via a network connection. When the computer program is executed by the processor, it implements the steps of the aforementioned digital positioning method for the turbine working blade fir tree tenon strut.

[0115] Those skilled in the art will understand that Figure 12 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0116] Another preferred embodiment of this application also provides a storage medium, the storage medium including a stored program, which, when the program is executed, controls the device where the storage medium is located to perform the steps of the digital positioning method for the turbine working blade fir tree tenon strut in the above embodiments.

[0117] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0118] If the functions described in this embodiment are implemented as software functional units and sold or used as independent products, they can be stored in one or more computing device-readable storage media. Based on this understanding, the parts of this application's embodiments that contribute to the prior art or the technical solutions can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a computing device (which may be a personal computer, server, mobile computing device, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage media include: USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media capable of storing program code.

[0119] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0120] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0121] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0122] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0123] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0124] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for digitally positioning the strut of a fir-tree-shaped tenon on a turbine working blade, characterized in that, Including the following steps: S1. Using the self-centering scanning function of the left and right probes, multiple points are sampled on the working surfaces of the upper and lower tenons on both sides of the tenon to obtain relevant reference planes. Combining the relevant reference planes and the right-hand rule of the Cartesian coordinate system, the coordinate system of the blade stacking axis center is obtained. S2. Utilize the self-centering scanning function of the probe of the customized coordinate measuring machine to calculate the tenon span distance based on the coordinate system of the blade stacking axis center after it is tangent to the upper and lower tooth profile working surfaces of the tenon. This completes the accurate, automatic, and digital detection of the blade tenon span size. Step S2 specifically includes the following steps: S21. The probe of the customized coordinate measuring machine is tangent to the upper and lower tooth working surfaces of the tenon using its self-centering scanning function. The diameter of the spherical probe is the same as the diameter of the standard measuring rod. S22. Using a probe to simulate the actual rolling bar, scan the corresponding tooth grooves on the left and right sides of the tenon. S23. Record the center coordinates of the left and right probes based on the coordinate system of the blade stacking axis and calculate the distance value. Then add the probe diameter to obtain the span distance of the tenon, and complete the accurate, automatic and digital detection of the span size of the blade tenon. The specific steps of step S1 are as follows: S11. Using the self-centering scanning function of the left and right probes, sampling points are taken at multiple tangent points on the working surfaces of the upper and lower tenons on both sides of the tenon, and the center coordinates of the probes located at each sampling point are recorded. S12. Construct a symmetrical first plane A1 and a second plane A2 on both sides of the tenon, wherein the first plane A1 is tangent to the outer circle of the spherical probe of the probe located at each sampling point on one side of the tenon, and the first plane A1 is tangent to the outer circle of the spherical probe of the probe located at each sampling point on the other side of the tenon. S13. Construct the center plane A3 of symmetry between the first plane A1 and the second plane A2; S14. Construct a third plane B3, which is perpendicular to the symmetry center plane A3 and tangent to the lowest point of the spherical probe of the probe located at the lowest sampling point on both sides of the tenon. S15. Determine the coordinate system of the blade stacking axis center based on the constructed symmetry center plane A3 and the third plane B3; S15 specifically includes the following steps: S151. Construct an axial direction X based on the intersection line of the symmetry center plane A3 and the third plane B3, and take the direction of the axial direction X pointing to the trailing edge of the blade as the positive direction; S152. Based on the square and Cartesian coordinate system right-hand rule of the X-axis, the coordinate system (X, Y, Z) of the blade stacking axis center is obtained. In step S11, the self-centering scanning function of the left and right probes is used to collect data at at least four points on the working surfaces of the upper and lower tenons on each side of the tenon, and the center coordinates of the probes located at each sampling point are recorded.

2. The digital positioning method for the strut of the fir tree-shaped tenon of the turbine working blade according to claim 1, characterized in that, In the coordinate system of the blade stacking axis center, the positive direction of the Y axis points to the back of the blade, and the positive direction of the Z axis points to the tip of the blade.

3. A digital positioning device for the crossbar of the fir tree-shaped tenon of a turbine working blade, characterized in that, include: The tenon coordinate system establishment module is used to obtain relevant reference planes by using the self-centering scanning function of the left and right probes to perform multi-point sampling on the working surfaces of the upper and lower tenons on both sides of the tenon. Combined with the relevant reference planes and the right-hand rule of the Cartesian coordinate system, the coordinate system of the blade stacking axis center is obtained. The tenon span detection module is used to calculate the tenon span based on the coordinate system of the blade stacking axis center by using the self-centering scanning function of the probe of the customized coordinate measuring machine and tangent to the upper and lower tooth profile working surfaces of the tenon. This completes the accurate, automatic and digital detection of the blade tenon span size. The bar spacing digital detection module includes: The tenon self-centering scanning module is used to utilize the self-centering scanning function of the probe of a customized coordinate measuring machine to make it tangent to the upper and lower tooth profile working surfaces of the tenon. The diameter of the spherical probe is the same as the diameter of the standard measuring rod. The left and right tooth groove scanning module is used to scan the corresponding tooth grooves on the left and right sides of the tenon teeth respectively by simulating the actual rolling bar with a probe; The straddle dimension detection module is used to record the center coordinates of the left and right probes based on the coordinate system of the blade stacking axis center, calculate the distance value, and add the probe diameter to obtain the straddle distance of the tenon, thus completing the accurate, automatic and digital detection of the straddle dimension of the blade tenon; The tenon coordinate system establishment module includes: The multi-point sampling module is used to collect samples at multiple tangential points on the upper and lower tenon working surfaces on both sides of the tenon using the self-centering scanning function of the left and right probes, and to record the center coordinates of the probes located at each sampling point. A symmetrical plane construction module is used to construct a first plane A1 and a second plane A2 on both sides of the tenon, wherein the first plane A1 is tangent to the outer circle of the spherical probe of the probe located at each sampling point on one side of the tenon, and the first plane A1 is tangent to the outer circle of the spherical probe of the probe located at each sampling point on the other side of the tenon. A symmetry center plane construction module is used to construct the symmetry center plane A3 of the first plane A1 and the second plane A2; The third plane construction module is used to construct the third plane B3, which is perpendicular to the symmetry center plane A3 and tangent to the lowest point of the spherical probe of the probe located at the lowest sampling point on both sides of the tenon. The blade stacking axis center coordinate system construction module is used to determine the blade stacking axis center coordinate system based on the constructed symmetry center plane A3 and the third plane B3. The module for constructing the coordinate system of the blade stacking axis center includes: The axial X construction module is used to construct the axial X based on the intersection line of the symmetry center plane A3 and the third plane B3, with the direction of the axial X pointing towards the trailing edge of the blade as the positive direction; The coordinate system construction module is used to obtain the coordinate system (X, Y, Z) of the blade stacking axis center according to the square and Cartesian coordinate system right-hand rule of the axis X.

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