A method, system, device and medium for three-coordinate measurement of dovetail mortise

Abstract

The application provides a dovetail mortise three-coordinate measurement method, system, device and medium, including the following steps: establishing a part initial coordinate system by using a three-coordinate measuring machine; establishing an initial local coordinate system based on the first dovetail mortise of the part; measuring the dovetail mortise in the initial local coordinate system to obtain a measurement value, comparing the measurement value with measured data and correcting the initial local coordinate system to obtain a first corrected local coordinate system; constructing a Z plane of the dovetail mortise in the first corrected local coordinate system, and taking the Z plane as the Y axis of the first corrected local coordinate system, again correcting the Y axis, the X axis and the Z axis of the first corrected local coordinate system based on the measured data to obtain a final local coordinate system; constructing a Z plane of each dovetail mortise in the final local coordinate system, judging whether a standard is met based on the difference value of each parameter of the Z plane and the part initial coordinate system, and a preset parameter difference threshold value, and completing detection; and the application improves the efficiency and precision of dovetail mortise detection.

Description

Technical Field

[0001] This invention belongs to the field of product testing technology, specifically relating to a three-coordinate measurement method, system, equipment, and medium for dovetail tenon grooves. Background Technology

[0002] In aero engines, the compressor disk and rotor blades are generally manufactured separately. After manufacturing, the rotor blade tenons are fitted into the dovetail tenons of the disk-like parts to form a whole. During engine operation, the rotor blades rotate together through the dovetail tenons of the disk. Therefore, the dovetail tenon structure in engine disk-like parts is relatively complex, requires high dimensional accuracy, and is difficult to manufacture and inspect.

[0003] Currently, the existing method for measuring dovetail tenons in aero-engine disc parts involves designing and using specialized integrated measuring instruments. This method is not only costly and time-consuming to manufacture, but also inefficient due to the large number of dovetail tenons. Furthermore, the positional accuracy of the dovetail tenons can only be obtained through a combination of indirect measurement using specialized instruments and manual calculation, which is both inefficient and inaccurate. In addition, the specialized measuring instruments are complex to operate and require highly skilled inspectors, making them prone to human error and inaccurate measurement results. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a three-coordinate measurement method, system, equipment and medium for dovetail tenons, which can efficiently and accurately detect dovetail tenons.

[0005] This invention is achieved through the following technical solution:

[0006] A coordinate measuring method for dovetail tenons includes the following steps:

[0007] S1: Establish the initial coordinate system of the part using a coordinate measuring machine;

[0008] S2: Establish an initial local coordinate system based on the first dovetail tenon of the part;

[0009] S3: Measure the dovetail groove in the initial local coordinate system to obtain the measured value, compare the measured value with the actual measured data and correct the initial local coordinate system to obtain the first corrected local coordinate system;

[0010] S4: Construct the Z-plane of the dovetail tenon in the first corrected local coordinate system, and use the Z-plane as the Y-axis of the first corrected local coordinate system. Then, based on the measured data, correct the Y-axis, X-axis and Z-axis of the first corrected local coordinate system to obtain the final local coordinate system.

[0011] S5: Construct the Z-plane of each dovetail tenon in the final local coordinate system. Based on the difference between the parameters of the Z-plane and the initial coordinate system of the part, preset the parameter difference threshold, determine whether it meets the standard, and complete the inspection.

[0012] Furthermore, step S1 includes the following steps:

[0013] Place the part horizontally on the inspection platform of the coordinate measuring machine, collect data at the circumferential reference surface B of the part, and establish the original center coordinates of the part.

[0014] Collect points on the reference surface A of the part end face, establish reference plane A, and then transform plane A through theoretical depth a to obtain axial surface S.

[0015] Furthermore, step S2 includes the following steps:

[0016] Six points with a theoretical radius r from the center of the part were collected on the surface of the first dovetail tenon parallel to the axis of symmetry, and the axis of symmetry of the first groove was established.

[0017] The intersection of the first groove's axis of symmetry c and the axial plane S is the initial center point p of the first dovetail tenon, and it is used as the origin of the initial local coordinate system.

[0018] Rotate the coordinate system around the initial center point p along the inclination direction of the dovetail tenon, with the rotation direction being the theoretical inclination direction of the dovetail tenon and the rotation angle being the inclination angle f of the first dovetail tenon. 0 ;

[0019] At the initial center point p of the first trench, the coordinate system is transformed to the theoretical plane Z, thus completing the creation of the initial local coordinate system.

[0020] Furthermore, each of the six points is located at the same height in pairs.

[0021] Furthermore, step S3 includes the following steps:

[0022] In the local coordinate system, measure the two sides of the working surface at the inlet and outlet of the first dovetail groove of the part, determine the axis of the dovetail groove, create the axis of symmetry, and record the data from the Y-axis to the Z-plane.

[0023] Using measured data, the X-axis was transformed and the local coordinate system was corrected to obtain the first corrected local coordinate system.

[0024] Furthermore, step S4 includes the following steps:

[0025] Twelve points are taken on the pressure surface of each side of the first dovetail tenon of the part, forming two planes K1 and K2. The center dividing plane of these two planes is plane K3, which is the dividing plane and the symmetry plane of the dovetail tenon.

[0026] Based on the theoretical width w of plane Z and working pressure surface, plane K3 is translated to both sides to obtain plane K4 and plane K5;

[0027] Plane K6 is constructed based on the two intersection lines of plane K4 and plane K5 with the working surface. Plane K6 is the Z-plane.

[0028] The Z-plane is the Y-axis of the local coordinate system. The actual measured values ​​obtained by re-measuring with a coordinate measuring machine are used to correct the Y-axis, X-axis and Z-axis of the local coordinate system.

[0029] Furthermore, step S5 includes the following steps:

[0030] Twelve points are collected on each dovetail tenon pressure surface, and two planes K1 and K2 are synthesized. Plane K3 is constructed through planes K1 and K2. Plane K3 is offset to the left and right by the measuring tool width distance to obtain planes K4 and K5. Plane K6 is established using the intersection of planes K1 and K4 and the intersection of planes K2 and K5 to obtain plane Z.

[0031] Record the angle between the Z-plane and the reference A on the end face of the part to obtain the perpendicularity relationship between the Z-plane and the reference A on the end face of the part and the uniformity of its distribution;

[0032] Record the distance from the Z-plane to the initial coordinate system of the part to obtain the position dimension r of the Z-plane and the uniformity of its distribution;

[0033] Record the distance from plane K3 to the center point of the initial coordinate system of the part to obtain the offset d of the dovetail tenon and the uniformity of its distribution;

[0034] Record the intersection values ​​of plane K3 and plane K6 on the axial plane S to obtain the value e of the specific positional degree of each dovetail tenon;

[0035] Based on the pre-set threshold values ​​of various parameters in the design drawings, the perpendicularity relationship between the Z-plane and the datum A on the end face of the part and its uniformity of distribution, the positional dimension r of the Z-plane and its uniformity of distribution, the offset d of the dovetail tenon and its uniformity of distribution, and the offset d of the dovetail tenon and its uniformity of distribution are compared and judged.

[0036] A coordinate measuring system for dovetail tenons includes:

[0037] The initial coordinate system establishment module is used to establish the initial coordinate system of a part using a coordinate measuring machine.

[0038] The initial local coordinate system establishment module is used to establish an initial local coordinate system based on the first dovetail tenon of the part;

[0039] The initial correction module is used to measure the dovetail groove in the initial local coordinate system to obtain the measured value, compare the measured value with the actual measured data and correct the initial local coordinate system to obtain the first corrected local coordinate system;

[0040] The second correction module is used to construct the Z-plane of the dovetail tenon in the first correction local coordinate system, and use the Z-plane as the Y-axis of the first correction local coordinate system. Based on the measured data, the Y-axis, X-axis and Z-axis of the first correction local coordinate system are corrected again to obtain the final local coordinate system.

[0041] The detection module is used to construct the Z-plane of each dovetail tenon in the final local coordinate system. Based on the difference between the parameters of the Z-plane and the initial coordinate system of the part, a preset parameter difference threshold is set to determine whether it meets the standard and complete the detection.

[0042] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of a coordinate measuring method for a dovetail tenon as described above.

[0043] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the coordinate measuring method for a dovetail tenon.

[0044] Compared with the prior art, the present invention has the following beneficial technical effects:

[0045] This invention provides a coordinate measuring method, system, device, and medium for measuring dovetail tenons, comprising the following steps: establishing an initial coordinate system for the part using a coordinate measuring machine; establishing an initial local coordinate system based on the first dovetail tenon of the part; measuring the dovetail tenon in the initial local coordinate system to obtain measured values, comparing the measured values ​​with actual measured data, and correcting the initial local coordinate system to obtain a first corrected local coordinate system; constructing the Z-plane of the dovetail tenon in the first corrected local coordinate system, and using the Z-plane as the Y-axis of the first corrected local coordinate system, further correcting the Y-axis, X-axis, and Z-axis of the first corrected local coordinate system based on actual measured data to obtain a final local coordinate system; constructing each... The Z-plane of the dovetail tenon is used to determine whether the parameters meet the standard based on the difference between the Z-plane and the parameters of the initial coordinate system of the part. The detection is completed by setting a threshold for the parameter difference. This application does not require any auxiliary tools. It can directly measure the perpendicularity, position, and offset of the dovetail tenon of aero-engine compressor disk parts by taking points on the surface of the dovetail tenon with a coordinate measuring machine and then performing two coordinate system corrections. This reduces the measurement cost of dovetail tenon inspection of disk parts, improves the accuracy of dovetail tenon size measurement, reduces the over-reliance on inspection personnel and the risk of errors, and greatly improves the efficiency of dovetail tenon inspection. Attached Figure Description

[0046] Figure 1 A schematic diagram showing the dimensional requirements for the dovetail tenon section of disc-shaped parts;

[0047] Figure 2 A schematic diagram showing the dimensional requirements for the dovetail tenon section of disc-shaped parts;

[0048] Figure 3 This is a schematic diagram illustrating the initial local coordinate system of the first trench for this invention.

[0049] Figure 4 This is a schematic diagram illustrating the calculation process of the local coordinate system for correcting the dovetail tenon groove in this invention. Detailed Implementation

[0050] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0051] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0053] This invention provides a coordinate measuring method for dovetail tenons, comprising the following steps:

[0054] S1: Establish the initial coordinate system of the part using a coordinate measuring machine;

[0055] S2: Establish an initial local coordinate system based on the first dovetail tenon of the part;

[0056] S3: Measure the dovetail groove in the initial local coordinate system to obtain the measured value, compare the measured value with the actual measured data and correct the initial local coordinate system to obtain the first corrected local coordinate system;

[0057] S4: Construct the Z-plane of the dovetail tenon in the first corrected local coordinate system, and use the Z-plane as the Y-axis of the first corrected local coordinate system. Then, based on the measured data, correct the Y-axis, X-axis and Z-axis of the first corrected local coordinate system to obtain the final local coordinate system.

[0058] S5: Construct the Z-plane of each dovetail tenon in the final local coordinate system. Based on the difference between the parameters of the Z-plane and the initial coordinate system of the part, preset the parameter difference threshold, determine whether it meets the standard, and complete the inspection.

[0059] Preferably, step S1 includes the following steps:

[0060] Place the part horizontally on the inspection platform of the coordinate measuring machine, collect data at the circumferential reference surface B of the part, and establish the original center coordinates of the part.

[0061] Collect points on the reference surface A of the part end face, establish reference plane A, and then transform plane A through theoretical depth a to obtain axial surface S.

[0062] Preferred, such as Figure 3 As shown, step S2 includes the following steps:

[0063] Six points with a theoretical radius r from the center of the part were collected on the surface of the first dovetail tenon parallel to the axis of symmetry, and the axis of symmetry of the first groove was established.

[0064] The intersection of the first groove's axis of symmetry c and the axial plane S is the initial center point p of the first dovetail tenon, and it is used as the origin of the initial local coordinate system.

[0065] Rotate the coordinate system around the initial center point p along the inclination direction of the dovetail tenon, with the rotation direction being the theoretical inclination direction of the dovetail tenon and the rotation angle being the inclination angle f of the first dovetail tenon. 0 ;

[0066] At the initial center point p of the first trench, the coordinate system is transformed to the theoretical plane Z, thus completing the creation of the initial local coordinate system.

[0067] Furthermore, each of the six points is located at the same height in pairs.

[0068] Preferably, step S3 includes the following steps:

[0069] In the local coordinate system, measure the two sides of the working surface at the inlet and outlet of the first dovetail groove of the part, determine the axis of the dovetail groove, create the axis of symmetry, and record the data from the Y-axis to the Z-plane.

[0070] Using measured data, the X-axis was transformed and the local coordinate system was corrected to obtain the first corrected local coordinate system.

[0071] Preferred, such as Figure 4 As shown, twelve points are taken on the pressure surface of each side of the first dovetail tenon of the part, forming two planes K1 and K2. The center dividing plane of these two planes is plane K3, which is the dividing plane and the symmetry plane of the dovetail tenon.

[0072] Based on the theoretical width w of plane Z and working pressure surface, plane K3 is translated to both sides to obtain plane K4 and plane K5;

[0073] Plane K6 is constructed based on the two intersection lines of plane K4 and plane K5 with the working surface. Plane K6 is the Z-plane.

[0074] The Z-plane is the Y-axis of the local coordinate system. The actual measured values ​​obtained by re-measuring with a coordinate measuring machine are used to correct the Y-axis, X-axis and Z-axis of the local coordinate system.

[0075] Preferred, such as Figure 4 As shown, step S5 includes the following steps:

[0076] Twelve points are collected on each dovetail tenon pressure surface, and two planes K1 and K2 are synthesized. Plane K3 is constructed through planes K1 and K2. Plane K3 is offset to the left and right by the measuring tool width distance to obtain planes K4 and K5. Plane K6 is established using the intersection of planes K1 and K4 and the intersection of planes K2 and K5 to obtain plane Z.

[0077] like Figure 1 and Figure 2 As shown, the angle between the Z plane and the reference A on the end face of the part is recorded to obtain the perpendicularity relationship between the Z plane and the reference A on the end face of the part and the uniformity of its distribution.

[0078] Record the distance from the Z-plane to the initial coordinate system of the part to obtain the position dimension r of the Z-plane and the uniformity of its distribution;

[0079] Record the distance from plane K3 to the center point of the initial coordinate system of the part to obtain the offset d of the dovetail tenon and the uniformity of its distribution;

[0080] Record the intersection values ​​of plane K3 and plane K6 on the axial plane S to obtain the value e of the specific positional degree of each dovetail tenon;

[0081] Based on the pre-set threshold values ​​of various parameters in the design drawings, the perpendicularity relationship between the Z-plane and the datum A on the end face of the part and its uniformity of distribution, the positional dimension r of the Z-plane and its uniformity of distribution, the offset d of the dovetail tenon and its uniformity of distribution, and the offset d of the dovetail tenon and its uniformity of distribution are compared and judged.

[0082] The present invention also provides a coordinate measuring system for dovetail tenons, comprising:

[0083] The initial coordinate system establishment module is used to establish the initial coordinate system of a part using a coordinate measuring machine.

[0084] The initial local coordinate system establishment module is used to establish an initial local coordinate system based on the first dovetail tenon of the part;

[0085] The initial correction module is used to measure the dovetail groove in the initial local coordinate system to obtain the measured value, compare the measured value with the actual measured data and correct the initial local coordinate system to obtain the first corrected local coordinate system;

[0086] The second correction module is used to construct the Z-plane of the dovetail tenon in the first correction local coordinate system, and use the Z-plane as the Y-axis of the first correction local coordinate system. Based on the measured data, the Y-axis, X-axis and Z-axis of the first correction local coordinate system are corrected again to obtain the final local coordinate system.

[0087] The detection module is used to construct the Z-plane of each dovetail tenon in the final local coordinate system. Based on the difference between the parameters of the Z-plane and the initial coordinate system of the part, a preset parameter difference threshold is set to determine whether it meets the standard and complete the detection.

[0088] In another embodiment of the present invention, a computer device is provided, comprising a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions from the computer storage medium to achieve a corresponding method flow or corresponding function. The processor described in this embodiment of the present invention can be used for the operation of a coordinate measuring method for dovetail tenons.

[0089] In another embodiment of the present invention, a storage medium is provided, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, the storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the coordinate measuring method for a dovetail tenon in the above embodiments.

[0090] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied 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.

[0091] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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 illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0092] 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.

[0093] 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.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A three-coordinate measurement method for dovetail tenons, characterized in that, Includes the following steps: S1: Establish the initial coordinate system of the part using a coordinate measuring machine; Place the part horizontally on the inspection platform of the coordinate measuring machine, collect points on the circumferential reference surface B of the part, and establish the original center coordinates of the part; Collect points on the reference surface A of the part end face, establish a reference plane, and then transform the reference plane through the theoretical depth a to obtain the axial surface S; S2: Establish an initial local coordinate system based on the first dovetail tenon of the part; S3: Measure the dovetail groove in the initial local coordinate system to obtain the measured value, compare the measured value with the actual measured value obtained by re-measuring with a coordinate measuring machine, and correct the initial local coordinate system to obtain the first corrected local coordinate system; S4: Construct the Z-plane of the dovetail tenon in the initial corrected local coordinate system, and use the Z-plane as the Y-axis of the initial corrected local coordinate system. Then, based on the actual measurement values ​​obtained by re-measuring with a coordinate measuring machine, correct the Y-axis, X-axis, and Z-axis of the initial corrected local coordinate system to obtain the final local coordinate system; as detailed below: Twelve points are taken on each side of the working pressure surface of the first dovetail tenon of the part, forming two planes K1 and K2. The center dividing plane of these two planes is plane K3, which is the dividing plane and the symmetry plane of the dovetail tenon. Based on the theoretical width w of the Z plane and the working pressure surface, plane K3 is translated to both sides to obtain plane K4 and plane K5; Plane K6 is constructed based on the two intersection lines of planes K4 and K5 with the working pressure surface. Plane K6 is the Z-plane. The Z-plane is the Y-axis of the local coordinate system that was first corrected. The actual measurement values ​​obtained by re-measuring with a coordinate measuring machine are used to correct the Y-axis, X-axis and Z-axis of the local coordinate system. S5: Construct the Z-plane for each dovetail tenon in the final local coordinate system. Based on the differences between the parameters of the Z-plane and the initial coordinate system of the part, preset parameter difference thresholds are used to determine whether the standard is met, thus completing the inspection; details are as follows: Record the angle between the Z-plane and the reference A on the end face of the part to obtain the perpendicularity relationship between the Z-plane and the reference A on the end face of the part and the uniformity of its distribution; Record the distance from the Z-plane to the initial coordinate system of the part to obtain the position dimension r of the Z-plane. Z And the uniformity of its distribution; Record the distance from plane K3 to the center point of the initial coordinate system of the part to obtain the offset d of the dovetail tenon and the uniformity of its distribution; Record the intersection values ​​of plane K3 and plane K6 on the axial plane S to obtain the value e of the specific positional degree of each dovetail tenon; Based on the pre-set threshold values ​​for various parameters according to the geometric tolerances in the design drawings, the perpendicularity relationship between the Z-plane and the datum A on the end face of the part, the uniformity of their distribution, and the positional dimension r of the Z-plane are compared. Z The uniformity of its distribution, the offset d of the dovetail tenon and the uniformity of its distribution, and the judgment are made.

2. The coordinate measuring method for a dovetail tenon according to claim 1, characterized in that, Step S2 includes the following steps: Six points with a theoretical radius r0 from the center of the part were collected on the surface of the first dovetail tenon parallel to the axis of symmetry, and the axis of symmetry of the first groove was established. The intersection of the first groove's axis of symmetry c and the axial plane S is the initial center point p of the first dovetail tenon, and it is used as the origin of the initial local coordinate system. Rotate the coordinate system around the initial center point p along the inclination direction of the dovetail tenon, with the rotation direction being the theoretical inclination direction of the dovetail tenon and the rotation angle being the inclination angle f of the first dovetail tenon. 0 ; Transform the coordinate system from the initial center point p of the first trench to the theoretical plane Z. ’ This completes the creation of the initial local coordinate system.

3. The coordinate measuring method for a dovetail tenon according to claim 2, characterized in that, Of the six points, each pair is located at the same height.

4. The coordinate measuring method for a dovetail tenon according to claim 1, characterized in that, Step S3 includes the following steps: In the initial local coordinate system, measure both sides of the working pressure surface at the inlet and outlet of the first dovetail groove of the part to determine the axis of the dovetail groove and create the axis of symmetry. The actual measured values ​​were remeasured using a coordinate measuring machine, the X-axis was transformed, and the initial local coordinate system was corrected to obtain the first corrected local coordinate system.

5. A coordinate measuring system for dovetail tenons, characterized in that, A coordinate measuring method for a dovetail tenon according to any one of claims 1-4 includes: The initial coordinate system establishment module is used to establish the initial coordinate system of a part using a coordinate measuring machine. The initial local coordinate system establishment module is used to establish an initial local coordinate system based on the first dovetail tenon of the part; The initial correction module is used to measure the dovetail groove in the initial local coordinate system to obtain the measurement value, compare the measurement value with the actual measurement value obtained by re-measuring with a coordinate measuring machine, and correct the initial local coordinate system to obtain the first corrected local coordinate system. The second correction module is used to construct the Z-plane of the dovetail tenon in the first correction local coordinate system, and use the Z-plane as the Y-axis of the first correction local coordinate system. Based on the actual measurement values ​​obtained by re-measuring with a coordinate measuring machine, the Y-axis, X-axis and Z-axis of the first correction local coordinate system are corrected again to obtain the final local coordinate system. The detection module is used to construct the Z-plane of each dovetail tenon in the final local coordinate system. Based on the difference between the parameters of the Z-plane and the initial coordinate system of the part, a preset parameter difference threshold is set to determine whether it meets the standard and complete the detection.

6. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the three-coordinate measurement method for a dovetail tenon as described in any one of claims 1-4.

7. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the three-coordinate measurement method for a dovetail tenon as described in any one of claims 1-4.

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