Method for measuring complex impeller blades based on six-point iteration method and related apparatus

Abstract

The application discloses a kind of based on six-point iterative method's complex impeller blade measurement method and related equipment, this method is on theoretical model, near the top position of model surface inner ring, 3 model points of same height are selected using 120 degree distribution principle;In model surface outer ring, 3 model points are selected using inner and outer symmetrical distribution principle, a total of 6 model points are selected, corresponding 6 entity points are collected on the part, and the entity points are fitted and iterated with model points, establish entity coordinate system, finally the measurement of part is completed under entity coordinate system;This method breaks the traditional coordinate system mode of "3 points construct surface, 2 points construct line, 1 point center", adopts six-point iterative method to construct part coordinate system, reasonably sets 6 points distribution, improves the uniformity of result deviation;This method effectively solves the problem of poor uniformity of impeller surface measurement result, can accurately measure the vector deviation of impeller surface, avoids the misjudgment caused by measurement error.

Description

Technical Field

[0001] This invention belongs to the field of measurement technology for blades of complex impeller parts, specifically relating to a measurement method and related equipment for complex impeller blades based on the six-point iteration method. Background Technology

[0002] As a key component of an engine, the manufacturing quality of the impeller directly affects the engine's aerodynamic performance and mechanical efficiency. Therefore, impeller measurement is a crucial aspect of controlling engine quality. An impeller can be divided into two parts: the hub surface and the blade surface. The typical configuration consists of several blades of equal length or staggered sizes evenly distributed on the hub surface. The blade surface includes covering surfaces, pressure surfaces, and suction surfaces, all of which are composed of non-developable ruled surfaces and free-form surfaces.

[0003] With the rapid development of industry, the requirements for the performance of aero engines are becoming increasingly stringent, and the accuracy, methods, and evaluation of impeller measurements are becoming increasingly important. During the manufacturing of aero engine impellers, a parametric model of the impeller is designed using computer software, and the product is manufactured through casting and machining. Whether the impeller parameters obtained after machining meet the design requirements, especially the thickness and shape parameters of the blades, directly affects the performance of the aero engine.

[0004] For the measurement of some complex impeller blades, traditional measurement methods are limited by the cumulative error of auxiliary references, resulting in poor uniformity of measurement results and making it impossible to verify whether the processed impeller blades meet product requirements. Summary of the Invention

[0005] To overcome the shortcomings of the above-mentioned technologies, the present invention provides a measurement method and related equipment for complex impeller blades based on the six-point iterative method, which can solve the technical problem that the measurement results are not uniform due to the cumulative error of the auxiliary reference in the existing measurement methods.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A measurement method for complex impeller blades based on a six-point iterative method, comprising:

[0008] Six model points are selected on the theoretical model of the impeller blade. The selection steps for the six model points are as follows: on the theoretical model, three model points at the same height are selected near the top of the inner ring of the model surface using a 120-degree distribution principle; on the outer ring of the model surface, three model points are selected using an inner and outer symmetrical distribution principle.

[0009] Six corresponding entity points on the part were collected based on the coordinate positions of six model points;

[0010] The six entity points are fitted to the six model points and the six entity points are iterated until the judgment condition reaches the preset threshold, thus constructing the entity coordinate system.

[0011] Based on the solid coordinate system, the measurement results are output according to the measured values ​​of the scanned part.

[0012] Furthermore, when selecting model points on the outer ring of the model surface, two model points on the outer wall of the impeller and one model point on the inner wall of the impeller are selected, or two model points on the inner wall of the impeller and one model point on the outer wall of the impeller are selected.

[0013] Furthermore, the six corresponding physical points on the part are manually acquired using a coordinate measuring machine.

[0014] Furthermore, after obtaining the entity coordinate system, it also includes:

[0015] Six model points were reselected on the theoretical model, and the parts were automatically collected. After fitting and iterative processing, a refined coordinate system was constructed.

[0016] Furthermore, the preset threshold includes a preset number of iterations and a target precision; the iteration process ends when the actual number of iterations reaches the preset number of iterations or when the precision of the current output reaches the target precision.

[0017] Furthermore, the specific steps for measuring parts using a solid coordinate system include:

[0018] Multiple vector points corresponding to random locations on the model are collected and input into the solid coordinate system to verify the uniformity of vector deviation in each region. Curve scanning is performed on the points in each region of the impeller to evaluate the vector deviation or curve profile of each point. The measured values ​​are then summarized and the measurement results are output based on the measured values.

[0019] Furthermore, it also includes:

[0020] Based on the obtained solid coordinate system, the numerical information of the impeller inner hole and impeller end face of the back-measured part is transmitted to the installation and processing module so that the installation and processing module can process the impeller mounting component according to the numerical information.

[0021] A measurement system for complex impeller blades based on a six-point iterative method, comprising the following steps for the aforementioned measurement method for complex impeller blades based on a six-point iterative method:

[0022] The model point acquisition module is used to select 6 model points on the theoretical model of the impeller blade. The selection steps for the 6 model points are as follows: on the theoretical model, 3 model points at the same height are selected near the top of the inner circle of the model surface using a 120-degree distribution principle; on the outer circle of the model surface, 3 model points are selected using an inner and outer symmetrical distribution principle.

[0023] The solid point acquisition module is used to acquire 6 corresponding solid points on the part based on the coordinate positions of 6 model points;

[0024] The fitting iteration module is used to fit 6 entity points with 6 model points and iterate on the 6 entity points until the judgment condition reaches the preset threshold to construct the entity coordinate system.

[0025] The measurement module is used to output measurement results based on the measurement values ​​of the scanned part, using a solid coordinate system.

[0026] An apparatus comprising:

[0027] Memory, used to store computer programs;

[0028] A processor, configured to execute the computer program to implement the steps of the measurement method for complex impeller blades based on the six-point iteration method as described in any one of claims 1-7.

[0029] A computer-readable storage medium storing a computer program, which, when executed by a processor, is used to implement the steps of the above-described measurement method for complex impeller blades based on the six-point iterative method.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] This invention also provides a measurement method for complex impeller blades based on a six-point iteration method. This method selects three model points at the same height near the top of the inner ring of the theoretical model surface, using a 120-degree distribution principle; and three more model points are selected on the outer ring of the model surface, using an inner-outer symmetrical distribution principle, for a total of six model points. These six corresponding solid points are collected on the part, and the solid points are iteratively fitted with the model points to establish a solid coordinate system. Finally, the part is measured in this solid coordinate system. This method breaks away from the traditional coordinate system construction pattern of "3 points to construct the surface, 2 points to construct the line, and 1 point to determine the center," using a six-point iteration method to construct the part coordinate system. This ensures that the six points are evenly distributed on the impeller profile, taking into account both the inner and outer sides of the blade. When performing coordinate system iteration, it achieves uniform tolerance distribution across the entire impeller surface, avoiding the phenomenon of small contours on the inner side or in some areas, while large contours are found in other locations. This method effectively solves the problem of poor uniformity in impeller profile measurement results, accurately measuring the impeller profile vector deviation and avoiding misjudgments caused by measurement errors.

[0032] Preferably, in this invention, the measurement process is effectively linked with the subsequent installation and processing process. Based on the coordinate system and center position constructed by the "six-point iteration method", the numerical results of the inner hole and impeller end face are measured and fed back to the subsequent processing. This can effectively improve the correspondence between the impeller after installation and the measurement results, and improve the operating performance to a certain extent. Attached Figure Description

[0033] Figure 1 A schematic diagram showing the selection of points in the measurement method for complex impeller blades based on the six-point iteration method provided in this embodiment of the invention;

[0034] Figure 2 A flowchart of a measurement method for complex impeller blades based on a six-point iteration method provided by the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of a measurement system for complex impeller blades based on the six-point iteration method provided by the present invention. Detailed Implementation

[0036] This invention provides a measurement method for complex impeller blades based on a six-point iterative method, such as... Figure 2 As shown, it includes the following steps:

[0037] S1: Select 6 model points on the theoretical model of the impeller blade; the selection steps for the 6 model points are as follows: on the theoretical model, near the top of the inner circle of the model surface, select 3 model points at the same height using the 120-degree distribution principle; on the outer circle of the model surface, select 3 model points using the principle of symmetrical distribution inside and outside.

[0038] Specifically, when selecting model points on the outer ring of the model surface, select two model points on the outer wall of the impeller and one model point on the inner wall of the impeller, or select two model points on the inner wall of the impeller and one model point on the outer wall of the impeller.

[0039] S2: Collect 6 corresponding entity points on the part based on the coordinate positions of 6 model points; among them, the 6 corresponding entity points on the part are collected manually using a coordinate measuring machine.

[0040] S3: Fit the 6 entity points to the 6 model points and iterate over the 6 entity points until the judgment condition reaches the preset threshold to construct the entity coordinate system.

[0041] To improve the measurement accuracy of the constructed coordinate system, after obtaining the solid coordinate system, six model points were reselected on the theoretical model, and the parts were automatically collected. After fitting and iterative processing, a refined coordinate system was constructed.

[0042] Here, the aforementioned preset thresholds include the preset number of iterations and the target precision; the iteration process ends when the actual number of iterations reaches the preset number of iterations or when the precision of the current output reaches the target precision.

[0043] S4: Based on the solid coordinate system, output the measurement results according to the measured values ​​of the scanned part.

[0044] The specific steps for measuring parts using a solid coordinate system include:

[0045] Multiple vector points corresponding to random locations on the model are collected and input into the solid coordinate system to verify the uniformity of vector deviation in each region. Curve scanning is performed on the points in each region of the impeller to evaluate the vector deviation or curve profile of each point. The measured values ​​are then summarized and the measurement results are output based on the measured values.

[0046] To effectively improve the correlation between the impeller installation and measurement results, this method also includes:

[0047] Based on the obtained solid coordinate system, the numerical information of the impeller inner hole and impeller end face of the back-measured part is transmitted to the installation and processing module so that the installation and processing module can process the impeller mounting component according to the numerical information.

[0048] like Figure 3 As shown, this invention also provides a measurement system for complex impeller blades based on a six-point iteration method, comprising: a model point acquisition module for selecting six model points on a theoretical model of the impeller blade; wherein the selection steps for the six model points are as follows: on the theoretical model, three model points at the same height are selected near the top of the inner ring of the model surface using a 120-degree distribution principle; three model points are selected on the outer ring of the model surface using an inner-outer symmetrical distribution principle; a solid point acquisition module for acquiring six corresponding solid points on the part based on the coordinate positions of the six model points; a fitting iteration module for fitting the six solid points with the six model points and iterating the six solid points until the judgment condition reaches a preset threshold, thereby constructing a solid coordinate system; and a measurement module for outputting measurement results based on the solid coordinate system and the measurement values ​​of the scanned part.

[0049] The present invention also provides an apparatus comprising: a memory for storing a computer program; and a processor for executing the computer program to implement the steps of the measurement method for complex impeller blades based on the six-point iteration method.

[0050] When the processor executes the computer program, it implements the steps for measuring complex impeller blades based on the six-point iteration method, for example: selecting six model points on the theoretical model of the impeller blade; wherein, the selection steps for the six model points are as follows: on the theoretical model, near the top position of the inner ring of the model surface, three model points at the same height are selected using a 120-degree distribution principle; on the outer ring of the model surface, three model points are selected using an inner-outer symmetrical distribution principle; based on the coordinate positions of the six model points, six corresponding solid points on the part are collected; the six solid points are fitted with the six model points and iterated on the six solid points until the judgment condition reaches a preset threshold, thus constructing a solid coordinate system; based on the solid coordinate system, the measurement results are output according to the measurement values ​​of the scanned part.

[0051] Alternatively, when the processor executes the computer program, it implements the functions of each module in the above system, such as: a model point acquisition module, used to select 6 model points on the theoretical model of the impeller blade; wherein the selection steps of the 6 model points are as follows: on the theoretical model, near the top position of the inner circle of the model surface, 3 model points at the same height are selected according to the 120-degree distribution principle; on the outer circle of the model surface, 3 model points are selected according to the inner and outer symmetrical distribution principle; a solid point acquisition module, used to acquire 6 corresponding solid points on the part based on the coordinate positions of the 6 model points; a fitting iteration module, used to fit the 6 solid points with the 6 model points and iterate the 6 solid points until the judgment condition reaches the preset threshold, and construct a solid coordinate system; a measurement module, used to output the measurement results based on the solid coordinate system and the measurement values ​​of the scanned part.

[0052] For example, the computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing preset functions, wherein the instruction segments describe the execution process of the computer program in the measuring device for complex impeller blades based on the six-point iterative method. For example, the computer program can be divided into a model point acquisition module, a solid point acquisition module, a fitting iteration module, and a measurement module; the specific functions of each module are as follows: The model point acquisition module is used to select 6 model points on the theoretical model of the impeller blade; wherein, the selection steps of the 6 model points are as follows: on the theoretical model, near the top position of the inner ring of the model surface, 3 model points at the same height are selected according to the 120-degree distribution principle; on the outer ring of the model surface, 3 model points are selected according to the inner and outer symmetrical distribution principle; The solid point acquisition module is used to acquire 6 corresponding solid points on the part based on the coordinate positions of the 6 model points; The fitting iteration module is used to fit the 6 solid points with the 6 model points and iterate the 6 solid points until the judgment condition reaches the preset threshold, and construct a solid coordinate system; The measurement module is used to output the measurement results based on the solid coordinate system and the measurement values ​​of the scanned part.

[0053] The measurement device for complex impeller blades based on the six-point iterative method can be a desktop computer, laptop, handheld computer, or cloud server, etc. The measurement device for complex impeller blades based on the six-point iterative method may include, but is not limited to, processors and memory. Those skilled in the art will understand that the above examples of measurement devices for complex impeller blades based on the six-point iterative method do not constitute a limitation on such devices. They may include more components than described above, or combine certain components, or use different components. For example, the measurement device for complex impeller blades based on the six-point iterative method may also include input / output devices, network access devices, buses, etc.

[0054] The processor can 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. The general-purpose processor can be a microprocessor, or any conventional processor. This processor is the control center for measuring the complex impeller blades based on the six-point iterative method, connecting various parts of the measurement equipment using various interfaces and lines.

[0055] The memory can be used to store the computer program and / or modules. The processor realizes various functions of the measurement device for complex impeller blades based on the six-point iteration method by running or executing the computer program and / or modules stored in the memory and calling the data stored in the memory.

[0056] The memory may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a given function (such as sound playback or image playback). The data storage area may store data created based on the use of the mobile phone (such as audio data and phonebook entries). Furthermore, the memory may include high-speed random access memory and non-volatile memory, such as hard disks, RAM, plug-in hard disks, smart media cards (SMC), secure digital cards (SD), flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0057] The present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method for measuring complex impeller blades based on a six-point iterative method.

[0058] If the integrated module / unit of the measurement system for complex impeller blades based on the six-point iteration method is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0059] Based on this understanding, the present invention can implement all or part of the process of the above-mentioned measurement method for complex impeller blades based on the six-point iteration method. This can also be accomplished by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the above-mentioned measurement method for complex impeller blades based on the six-point iteration method. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or a preset intermediate form, etc.

[0060] The computer-readable storage medium may include any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0061] It should be noted that the content contained in the computer-readable storage medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable storage medium does not include electrical carrier signals and telecommunication signals.

[0062] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0063] Example

[0064] As mentioned in the background section, traditional measurement methods suffer from poor uniformity in measurement results due to the cumulative error of auxiliary references, making it impossible to verify whether the processed impeller blades meet product requirements.

[0065] To address the aforementioned problems, this invention provides a measurement method for complex impeller blades based on a six-point iteration method, the specific steps of which are as follows:

[0066] (1) Using a coordinate measuring machine combined with an impeller digital model, a coordinate system is constructed using a 6-point iterative method, specifically:

[0067] a. Import the model into the measurement software and break away from the traditional mode of constructing the coordinate system by “3, 2, 1 (3 points to construct the surface, 2 points to construct the line, 1 point to determine the center of the circle)”. Based on the characteristics of the impeller profile, use the 6-point iteration method and reasonably set the distribution of the 6 points to improve the uniformity of the result deviation.

[0068] The specific explanation is as follows:

[0069] First, the traditional "3, 2, 1" method refers to a surface element consisting of 3 points, a line element consisting of 2 points, and a coordinate system origin element on the part. Since the impeller is a curved rotating body and there are no specific planar or line elements on the part, the traditional "3, 2, 1" method cannot be applied to the impeller. To achieve iterative measurement on the impeller, another method needs to be found. Therefore, the "6-point" iterative method was developed to realize its coordinate system iterative function and complete the related measurement of the impeller profile.

[0070] (2) Adopting the selection principle of 3 points with approximately the same height of the inner ring of the impeller, 2 points on the inner side of the outer ring of the impeller blade and 1 point on the outer side, a coordinate system is established by the 6-point method to replace the selection method of the surface formed by 3 points, the line formed by 2 points and the origin of the coordinate system.

[0071] (3) The advantage of this six-point iteration method is that it makes the six points evenly distributed on the impeller profile, taking into account both the inner and outer sides of the blade. When the coordinate system iteration is performed, it can achieve uniform tolerance distribution on all aspects of the impeller surface, avoiding the phenomenon that the inner side or local profile is small while the profile of other positions is large in the measurement results.

[0072] (4) The specific process of establishing the coordinate system is as follows: import the model into the software, select 6 points on the model using the 6-point method as iteration points and iteration target accuracy, establish the coordinate system in manual mode, then execute the coordinate system program, manually collect the corresponding 6 points on the model according to the prompts on the part, and after completing the initial selection, refine the coordinate system in automatic mode. This eliminates the measurement error introduced by the deviation between the measurement direction and the surface normal direction when the 6-point measurement vector is used during manual collection and automatic measurement, which is the vector of the corresponding point on the model. This improves the accuracy of coordinate system establishment and thus improves the measurement accuracy of impeller profile. The above is one of the inventive points of this invention.

[0073] like Figure 1 As shown, the steps for selecting model points are as follows: First, at the top of the impeller model surface, near the inner ring of the impeller surface, and maintaining approximately the same height, set 3 points at a 120-degree angle. Then, set the remaining 3 points on the outer ring of the impeller, using the principle of symmetrical distribution inside and outside, that is, select 2 model points on the outer wall of the impeller and 1 model point on the inner wall of the impeller, or select 2 model points on the inner wall of the impeller and 1 model point on the outer wall of the impeller. Figure 1 In the process, two model points on the inner wall of the impeller and one model point on the outer wall of the impeller are selected.

[0074] b. Set the number of iterations and the target accuracy, and manually collect the corresponding 6 entity points on the physical part; the coordinate machine automatically iterates multiple times to complete the initial construction of the coordinate system and the fitting of the coordinate system between the part and the digital model, until the actual number of iterations reaches the preset number of iterations or the accuracy of the current output reaches the target accuracy, then the iteration process ends; the iteration here is specifically as follows: using 6 model points as iteration points, the coordinate machine continuously collects 6 entity points on the part along the vector direction, making them as close as possible to the corresponding model points; the purpose of this step is to associate the entity coordinate system with the theoretical model.

[0075] (2) Six points were reset on the theoretical model and the automatic acquisition function was used to complete the "six-point iterative method" to refine the coordinate system and improve the accuracy of the measurement results. When the physical coordinate system was initially established, the manual acquisition method was used. The manual acquisition to build the coordinate system would bring certain errors. In order to minimize the errors, the above process was repeated with the automatic acquisition method to obtain the refined coordinate system, which made the subsequent measurement results more accurate.

[0076] In this step, the measurement software is set to DCC automatic mode. Six points are re-established on the model using the six-point selection principle to create coordinate system 2. The iterative coordinate system is then automatically executed to complete the "six-point selection method" for precise coordinate system construction, improving the accuracy of the coordinate system and the overall rim measurement results.

[0077] (3) On the model, vector points are randomly collected at multiple locations to verify the uniformity of vector deviation in each region, thereby verifying whether the entity coordinate system meets the construction requirements. Through verification, the measurement results can be made more accurate. Then, the curve scanning function is used to complete the point scanning of each region of the impeller and evaluate the vector deviation or curve profile of each point to obtain the final measurement results.

[0078] In addition, this embodiment includes the following steps to effectively link the part measurement process with the subsequent assembly and machining process:

[0079] (4) Measurement results compensate for the process:

[0080] The profile measurement results obtained from the above measurement method represent the shape error of the impeller surface itself, excluding positional errors. The impeller's performance during installation and use is controlled based on the combined effect of shape and positional errors. Therefore, to ensure the performance of the product in later use, positional tolerances should be controlled accordingly.

[0081] The specific method involves back-measuring the position of the center hole in the impeller part's mounting coordinate system under an iterative method (marking the direction and deviation results), as well as the deviation value and positive / negative direction of the impeller top surface height from the theoretical height on the model. The results are then fed back into subsequent machining processes for height allowance and center position adjustments. This method achieves coordination and unification between the optimal impeller profile and the center and high / low origin points, improving the actual operational performance of the product.

[0082] In summary, this invention provides a measurement method for complex impeller blades based on a six-point iterative method, which has the following advantages compared to existing measurement methods:

[0083] This method effectively solves the problem of poor uniformity in impeller profile measurement results, accurately measuring the vector deviation of the impeller profile and avoiding misjudgments caused by measurement errors. Based on the coordinate system and center position constructed using the "six-point iteration method," the numerical results of the inner hole and impeller component end face are measured and fed back into subsequent processing, effectively improving the correspondence between the impeller after installation and the measurement results, and enhancing operational performance to a certain extent. Through the use of a measurement method for complex impeller blades based on the six-point iteration method, and through practical data analysis, the part qualification rate has reached over 98%.

[0084] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A measurement method for complex impeller blades based on a six-point iterative method, characterized in that, include: Six model points are selected on the theoretical model of the impeller blade. The selection steps for the six model points are as follows: on the theoretical model, three model points at the same height are selected near the top of the inner ring of the model surface using a 120-degree distribution principle; on the outer ring of the model surface, three model points are selected using an inner and outer symmetrical distribution principle. Six corresponding entity points on the part were collected based on the coordinate positions of six model points; The six entity points are fitted to the six model points and the six entity points are iterated until the judgment condition reaches the preset threshold, thus constructing the entity coordinate system. Based on the solid coordinate system, the measurement results are output according to the measured values ​​of the scanned part; Specifically, when selecting model points on the outer ring of the model surface, two model points on the outer wall of the impeller and one model point on the inner wall of the impeller are selected, or two model points on the inner wall of the impeller and one model point on the outer wall of the impeller are selected. After obtaining the entity coordinate system, it also includes: Six model points were reselected on the theoretical model, and the parts were automatically collected. After fitting and iterative processing, a refined coordinate system was constructed. Also includes: Based on the obtained solid coordinate system, the numerical information of the impeller inner hole and impeller end face of the back-measured part is transmitted to the installation and processing module so that the installation and processing module can process the impeller mounting component according to the numerical information.

2. The measurement method for complex impeller blades based on the six-point iteration method according to claim 1, characterized in that, in, The six corresponding solid points on the part were manually acquired using a coordinate measuring machine.

3. The measurement method for complex impeller blades based on the six-point iteration method according to claim 1, characterized in that, The preset threshold includes a preset number of iterations and a target precision; The iteration process ends when the actual number of iterations reaches the preset number of iterations or when the accuracy of the current output reaches the target accuracy.

4. The measurement method for complex impeller blades based on the six-point iteration method according to claim 1, characterized in that, The specific steps for measuring parts using a solid coordinate system include: Multiple vector points corresponding to random locations on the model are collected and input into the solid coordinate system to verify the uniformity of vector deviation in each region. Curve scanning is performed on the points in each region of the impeller to evaluate the vector deviation or curve profile of each point. The measured values ​​are then summarized and the measurement results are output based on the measured values.

5. A measurement system for complex impeller blades based on a six-point iterative method, used to implement the steps of the measurement method for complex impeller blades based on a six-point iterative method as described in any one of claims 1-4, characterized in that, include: The model point acquisition module is used to select 6 model points on the theoretical model of the impeller blade. The selection steps for the 6 model points are as follows: on the theoretical model, 3 model points at the same height are selected near the top of the inner circle of the model surface using a 120-degree distribution principle; on the outer circle of the model surface, 3 model points are selected using an inner and outer symmetrical distribution principle. The solid point acquisition module is used to acquire 6 corresponding solid points on the part based on the coordinate positions of 6 model points; The fitting iteration module is used to fit 6 entity points with 6 model points and iterate on the 6 entity points until the judgment condition reaches the preset threshold to construct the entity coordinate system. The measurement module is used to output measurement results based on the measurement values ​​of the scanned part, using a solid coordinate system.

6. A device, characterized in that, include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the steps of the measurement method for complex impeller blades based on the six-point iterative method 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 is used to implement the steps of the measurement method for complex impeller blades based on the six-point iteration method as described in any one of claims 1-4.

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