Method for eccentricity correction of engine rotor cross-section measurement based on double cross-section characteristics

Abstract

The application relates to the field of contact measurement technology, in particular to an eccentricity correction method for engine rotary body section measurement based on double-section features. The method comprises the following steps: centering and tilting with the upper and lower sections of an engine rotary body as the reference, recording the first height and the first eccentricity of the centering and tilting reference surface, the first eccentric angle, the first height difference between the upper and lower sections, calculating the relative eccentricity and the relative eccentric angle of the upper and lower sections; obtaining the second height of the measured section, determining the second eccentricity and the second eccentric angle of the measured section relative to the centering and tilting reference surface according to the first height, the second height, the first height difference and the relative eccentricity and the relative eccentric angle; determining the correction value according to the second eccentricity and the second eccentric angle; and performing eccentricity correction on the measured section according to the correction value. The eccentricity correction method for engine rotary body section measurement based on double-section features aims to solve the problem that the eccentricity value of the measured section of the engine rotary body is difficult to eliminate.

Description

Technical Field

[0001] This invention relates to the field of contact measurement technology, and more specifically to an eccentricity correction method for measuring the cross-section of an engine rotating body based on dual-section characteristics. Background Technology

[0002] With the development of measurement technology, one-dimensional inductive inductors and rotary platforms are now commonly used to measure the cross-sections of rotating engine bodies. Since the workpiece is placed on the rotary platform, the workpiece's axis of rotation may not coincide with the platform's axis. Therefore, during cross-section measurement, the eccentricity of the measured cross-section is actually relative to the axis of the rotary platform, not relative to the workpiece's own axis of rotation. Generally, the axis of the workpiece can be aligned with the axis of the rotary platform by adjusting and leveling the workpiece's reference surface. In this case, the obtained eccentricity value of the measured cross-section can be considered to be relative to the workpiece's axis.

[0003] Since self-alignment and leveling cannot make the workpiece axis completely coincide with the axis of the rotary platform, after self-alignment and leveling, the reference plane and the axis of the rotary platform will still maintain an eccentricity of 2 to 10 micrometers. Therefore, the actual eccentricity value of the measured section is still not the eccentricity value relative to the workpiece axis.

[0004] Therefore, the inventors provide an eccentricity correction method for measuring the cross-section of an engine rotating body. Summary of the Invention

[0005] (1) Technical problems to be solved

[0006] This invention provides an eccentricity correction method for measuring the cross-section of an engine rotating body based on dual-section features, which solves the technical problem that the eccentricity value of the measured cross-section of the engine rotating body is difficult to eliminate.

[0007] (2) Technical solution

[0008] This invention provides a method for eccentricity correction based on the measurement of the cross-section of an engine rotating body using dual-section features, comprising the following steps:

[0009] After centering and tilting with the upper and lower sections of the engine rotating body as references, record the first height and first eccentricity, first eccentricity angle of the centering and tilting reference plane, the first height difference between the upper and lower sections, and calculate the relative eccentricity and relative eccentricity angle of the upper and lower sections.

[0010] The second height of the measured section is obtained, and based on the first height, the second height, the first height difference, the relative eccentricity, and the relative eccentricity angle, the second eccentricity and the second eccentricity angle of the measured section relative to the self-aligning and tilting reference plane are determined.

[0011] The correction value is determined based on the second eccentricity and the second eccentricity angle;

[0012] The eccentricity of the measured cross section is corrected based on the correction value.

[0013] Furthermore, the calculation of the relative eccentricity and relative eccentricity angle of the upper and lower cross sections specifically includes the following steps:

[0014] Determine the lower section of the two sections as the reference section, and calculate the eccentricity and eccentricity angle of the upper section relative to the reference section;

[0015] Based on the eccentricity and eccentricity angle of the upper section and the lower section, the relative eccentricity and relative eccentricity angle of the upper section relative to the reference section are determined.

[0016] Furthermore, the relative eccentricity is positively correlated with the eccentricity of the upper cross section, the cosine of the eccentricity angle of the upper cross section, and the sine of the eccentricity angle of the upper cross section, and the relative eccentricity is negatively correlated with the eccentricity of the lower cross section, the cosine of the eccentricity angle of the lower cross section, and the sine of the eccentricity angle of the lower cross section.

[0017] Furthermore, the relative eccentricity angle is positively correlated with the sine of the eccentricity angle of the upper section and the cosine of the eccentricity angle of the lower section, and negatively correlated with the sine of the eccentricity angle of the lower section and the cosine of the eccentricity angle of the upper section.

[0018] Furthermore, the formulas for calculating the relative eccentricity and the relative eccentricity angle are as follows:

[0019]

[0020]

[0021] In the formula, L CC For relative eccentricity, θ CC For relative eccentricity, L UP Let θ be the eccentricity of the upper cross section. UP Let L be the eccentricity angle of the upper section. D Let θ be the eccentricity of the lower section. D The eccentricity angle of the lower section is denoted by .

[0022] Furthermore, the second eccentricity is positively correlated with the relative eccentricity, the cosine of the relative eccentricity angle, and the sine of the relative eccentricity angle.

[0023] Furthermore, the second eccentric angle is positively correlated with the sine value of the relative eccentric angle, and the second eccentric angle is negatively correlated with the cosine value of the relative eccentric angle.

[0024] Furthermore, the formulas for calculating the second eccentricity and the second eccentricity angle are as follows:

[0025]

[0026]

[0027] In the formula, L BM-D For the second eccentricity, θ BM-D H is the second eccentric angle. D H is the highest altitude. BM For the second altitude, H UP -H D This is the first height difference.

[0028] Furthermore, determining the correction value based on the second eccentricity and the second eccentricity angle specifically includes the following steps:

[0029] The measurement data is corrected based on the eccentricity of the measured section relative to the reference section, and the measured value is decomposed into vectors in the X and Y directions according to the measurement angle.

[0030] The eccentricity of the measured section relative to the reference section is decomposed into vectors in the X and Y directions according to the eccentricity angle;

[0031] The correction value is obtained based on the X-direction vector of the measured value, the X-direction vector of the eccentricity, the Y-direction vector of the measured value, and the Y-direction vector of the eccentricity.

[0032] Furthermore, the formula for calculating the correction value is as follows:

[0033]

[0034] In the formula, D BM-X Let D be the decomposition vector of the measured value in the X direction. BM-Y L is the decomposition vector of the measured value in the Y direction. BM-D-X Let L be the decomposition vector of the second eccentricity in the X direction. BM-D-Y Let be the decomposition vector of the second eccentricity in the Y direction.

[0035] (3) Beneficial effects

[0036] In summary, this invention eliminates the eccentricity between the measured section and the axis of rotation by considering the characteristics of the dual-section, the height of the reference plane, and the measured section and its height. This achieves eccentricity correction in the measurement data of the engine's rotating body section, making the eccentricity value obtained from the measured section closer to the true value. Compared to the commonly used method in aero-engine measurement, which involves centering and tilting based on a reference plane, requiring the eccentricity of the reference section to be adjusted to within 2 micrometers before measurement can continue, and which is a very cumbersome and time-consuming process (adjusting the center of the workpiece's reference plane to 2 micrometers can take more than 20 minutes), the eccentricity correction method allows measurement to begin once the reference plane is adjusted to within 10 micrometers, which typically takes only 5 minutes. This method is superior to previous methods in terms of both convenience and time efficiency. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart illustrating an eccentricity correction method for measuring the cross-section of an engine rotating body based on dual-section features, provided in an embodiment of the present invention. Detailed Implementation

[0039] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

[0040] 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.

[0041] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] Figure 1This is a flowchart illustrating an eccentricity correction method for measuring the cross-section of an engine rotating body based on dual-section features, provided by an embodiment of the present invention. The method may include the following steps:

[0043] S100. After centering and tilting with the upper and lower sections of the engine rotating body as references, record the first height and first eccentricity, first eccentricity angle, and first height difference between the upper and lower sections of the centering and tilting reference plane, and calculate the relative eccentricity and relative eccentricity angle between the upper and lower sections.

[0044] Specifically, this step includes the following steps:

[0045] S101. Determine the lower section of the two sections as the reference section, and calculate the eccentricity and eccentricity angle of the upper section relative to the reference section;

[0046] S102. Based on the eccentricity and eccentricity angle of the upper section and the lower section, determine the relative eccentricity and relative eccentricity angle of the upper section relative to the reference section.

[0047] The relative eccentricity is positively correlated with the eccentricity of the upper cross section, the cosine of the eccentricity angle of the upper cross section, and the sine of the eccentricity angle of the upper cross section. Conversely, the relative eccentricity is negatively correlated with the eccentricity of the lower cross section, the cosine of the eccentricity angle of the lower cross section, and the sine of the eccentricity angle of the lower cross section. Similarly, the relative eccentricity angle is positively correlated with the sine of the eccentricity angle of the upper cross section and the cosine of the eccentricity angle of the lower cross section.

[0048] The formulas for calculating relative eccentricity and relative eccentricity angle are as follows:

[0049]

[0050]

[0051] In the formula, L CC For relative eccentricity, θ CC For relative eccentricity, L UP Let θ be the eccentricity of the upper cross section. UP Let L be the eccentricity angle of the upper section. D Let θ be the eccentricity of the lower section. D The eccentricity angle of the lower section is denoted by .

[0052] S200. Obtain the second height of the measured section, and determine the second eccentricity and second eccentricity angle of the measured section relative to the self-aligning and tilting reference plane based on the first height, the second height, the first height difference, the relative eccentricity, and the relative eccentricity angle.

[0053] Specifically, the second eccentricity is positively correlated with the relative eccentricity, the cosine of the relative eccentricity angle, and the sine of the relative eccentricity angle; the second eccentricity angle is positively correlated with the sine of the relative eccentricity angle; and the second eccentricity angle is negatively correlated with the cosine of the relative eccentricity angle.

[0054] The formulas for calculating the second eccentricity and the second eccentricity angle are as follows:

[0055]

[0056]

[0057] In the formula, L BM-D For the second eccentricity, θ BM-D H is the second eccentric angle. D H is the highest altitude. BM For the second altitude, H UP -H D This is the first height difference.

[0058] S300. Determine the correction value based on the second eccentricity and the second eccentricity angle.

[0059] Specifically, this step includes the following steps:

[0060] S301. Correct the measurement data according to the eccentricity of the measured section relative to the reference section, and decompose the measured value into vectors in the X and Y directions according to the measurement angle.

[0061] S302. The eccentricity of the measured section relative to the reference section is decomposed into vectors in the X and Y directions according to the eccentricity angle;

[0062] S303. The correction value is obtained based on the X-direction vector of the measured value, the X-direction vector of the eccentricity, the Y-direction vector of the measured value, and the Y-direction vector of the eccentricity.

[0063] The formula for calculating the correction value is as follows:

[0064]

[0065] In the formula, D BM-X Let D be the decomposition vector of the measured value in the X direction. BM-Y L is the decomposition vector of the measured value in the Y direction. BM-D-X Let L be the decomposition vector of the second eccentricity in the X direction. BM-D-Y Let be the decomposition vector of the second eccentricity in the Y direction.

[0066] S400, perform eccentricity correction on the measured section based on the correction value.

[0067] Specifically, the correction values ​​for all points on the measured cross section are calculated according to the above steps to complete the eccentricity correction during the measurement of the engine rotating body cross section.

[0068] Example 1

[0069] (1) To carry out the cross-sectional measurement of a certain engine rotating body, the first step is to use the eccentricity of the upper and lower cross-sections of the engine rotating body to adjust the center and tilt.

[0070] (2) After the centering and tilting are completed, record the eccentricity, eccentricity angle, height of the two sections and height difference between the sections. The lower section is the reference section. The eccentricity and eccentricity angle of the upper section relative to the reference section should be calculated.

[0071] The specific process is as follows: Let the eccentricity and eccentricity angle of the upper section be L respectively. UP =0.005 and θ UP =45°, the eccentricity and eccentricity angle of the reference section are L and L respectively. D =0.003 and θ D =30°, with relative eccentricity and eccentricity angle set as L respectively. CC and θ CC The formulas for calculating relative eccentricity and eccentricity angle are as follows:

[0072]

[0073]

[0074] (3) Measure the cross section to be measured. While recording the measurement data (including the measured value and the measured angle), record the height of the cross section to be measured as 100.

[0075] (4) Calculate the eccentricity of the cross-section relative to the datum plane. The height of the datum cross-section is H. D =0, the height of the measured section is H BM =100, the height difference between the upper and lower sections is H UP -H D =200, the eccentricity and eccentricity angle of the measured section relative to the reference plane are L. BM-D and θ BM-D The formulas for calculating the eccentricity and eccentricity angle of the measured section relative to the reference plane are as follows:

[0076]

[0077]

[0078] (5) Correct the measurement data according to the relative eccentricity of the cross section. For example, the measured value D of one of the data points. BM=0.01, the measurement angle is 45°. The measured value is decomposed into vectors D in the X and Y directions according to the measurement angle. BM-X =0.007 and D BM-Y =0.007, and at the same time, the eccentricity of the measured section relative to the reference plane is also decomposed into vectors L in the X and Y directions according to the eccentricity angle. BM-D-X =0.003 and L BM-D-Y =0.0025, add the X-direction vector of the measured value to the X-direction vector of the eccentricity, and add the Y-direction vector of the measured value to the Y-direction vector of the eccentricity. The correction value at that angle is then calculated using the following formula:

[0079]

[0080] (6) Calculate the correction values ​​for all points on the measured section according to the above steps to complete the correction.

[0081] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0082] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art without departing from the scope of the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A method for eccentricity correction based on the measurement of the cross-section of an engine rotating body using dual-section features, characterized in that, The method includes the following steps: After centering and tilting using the upper and lower sections of the engine's rotating body as references, the lower section is determined as the reference section. The eccentricity and eccentricity angle of the upper section, the eccentricity and eccentricity angle of the lower section, the first height of the lower section, and the first height difference between the upper and lower sections are recorded. The relative eccentricity and relative eccentricity angle of the upper and lower sections are then calculated. The formulas for calculating the relative eccentricity and relative eccentricity angle are as follows: In the formula, L CC For relative eccentricity, θ CC For relative eccentricity, L UP Let θ be the eccentricity of the upper cross section. UP Let L be the eccentricity angle of the upper section. D Let θ be the eccentricity of the lower section. D The eccentricity angle of the lower section; Obtain the second height of the measured section, and based on the first height, the second height, the difference between the first heights, the relative eccentricity, and the relative eccentricity angle, determine the second eccentricity and the second eccentricity angle of the measured section relative to the reference section; the calculation formulas for the second eccentricity and the second eccentricity angle are as follows: In the formula, L BM-D For the second eccentricity, θ BM-D H is the second eccentric angle. D H is the highest altitude. BM For the second altitude, H UP -H D This is the first height difference; Based on the second eccentricity and the second eccentricity angle, a correction value is determined; specifically as follows: the measured value of the measured section is decomposed into vectors in the X and Y directions according to the measurement angle; the second eccentricity of the measured section relative to the reference section is decomposed into vectors in the X and Y directions according to the second eccentricity angle; based on the vector in the X direction of the measured value, the vector in the X direction of the second eccentricity, the vector in the Y direction of the measured value, and the vector in the Y direction of the second eccentricity, the correction value is obtained; the formula for calculating the correction value is: In the formula, D BM-X Let D be the vector of the measured values ​​in the X direction. BM-Y Let L be the vector of the measured values ​​in the Y direction. BM-D-X Let L be the vector of the second eccentricity in the X direction. BM-D-Y Let be the vector of the second eccentricity in the Y direction; The eccentricity of the measured cross section is corrected based on the correction value.

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