Method for eccentricity correction of engine rotary body section measurement based on end cylindrical surface feature

Abstract

The application relates to the field of contact measurement technology and particularly relates to an eccentricity correction method for engine rotary body section measurement based on end cylindrical surface characteristics. The method comprises the following steps: after centering and tilting are adjusted based on the end surface and the cylindrical surface of the engine rotary body, the inclination amount, the inclination angle, the inclination radius of the reference end surface and the eccentricity amount, the eccentricity angle of the reference cylindrical surface are recorded; the measured section is measured, and the height, the measurement value and the measurement angle of the measured section are recorded; the relative eccentricity amount and the relative eccentricity angle of the measured section relative to the reference cylindrical surface are determined according to the height of the reference end surface, the height of the measured section, the inclination amount, the inclination angle, the inclination radius, the eccentricity amount and the eccentricity angle; the correction value is determined according to the relative eccentricity amount and the relative eccentricity angle; and the eccentricity correction of the measured section is carried out according to the correction value. The eccentricity correction method for engine rotary body section measurement based on end cylindrical surface characteristics 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 end cylindrical surface features. 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 based on the measurement of the cross-section of an engine rotating body using end cylindrical surface features. 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 end cylindrical surface 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 end cylindrical surface features, comprising the following steps:

[0009] After centering and tilting with the end face and cylindrical surface of the engine rotating body as reference, record the tilt amount, tilt angle, tilt radius of the reference end face, and the eccentricity and eccentricity angle of the reference cylindrical surface.

[0010] Measure the cross-section being measured, and record the height, measured value, and measurement angle of the cross-section being measured;

[0011] Based on the height of the reference end face, the height of the measured section, the tilt amount, the tilt angle, the tilt measurement radius, the eccentricity, and the eccentricity angle, the relative eccentricity and relative eccentricity angle of the measured section relative to the reference cylindrical surface are determined.

[0012] The correction value is determined based on the relative eccentricity and the relative eccentricity angle;

[0013] The eccentricity of the measured cross section is corrected based on the correction value.

[0014] Furthermore, the relative eccentricity is positively correlated with the tilt amount, the cosine of the tilt angle, the eccentricity, the cosine of the eccentric angle, and the height difference between the measured cross section and the reference end face, and the relative eccentricity is negatively correlated with the tilt radius.

[0015] Furthermore, the relative eccentricity angle is positively correlated with the sine value of the tilt angle and the sine value of the eccentricity angle, and the relative eccentricity angle is negatively correlated with the cosine value of the tilt angle and the cosine value of the eccentricity angle.

[0016] Furthermore, the formula for calculating the relative eccentricity is as follows:

[0017]

[0018] In the formula, L BM-D H represents the relative eccentricity of the measured cross section relative to the reference cylindrical surface. D H is the height of the reference end face. BM L is the height of the measured section. CC For the skewness, θ CC R is the tilt angle. CC To measure the tilt radius, L D For the eccentricity, θ D It is an off-center angle.

[0019] Furthermore, the formula for calculating the relative eccentricity angle is:

[0020]

[0021] In the formula, θ BM-D H is the relative eccentricity angle of the measured cross section relative to the reference cylindrical surface. D H is the height of the reference end face. BM L is the height of the measured section. CC For the skewness, θ CC R is the tilt angle. CC To measure the tilt radius, L D For the eccentricity, θ D It is an off-center angle.

[0022] Furthermore, determining the correction value based on the relative eccentricity and the relative eccentricity angle specifically includes the following steps:

[0023] The measured value is decomposed into vectors in the X and Y directions according to the measurement angle;

[0024] The relative eccentricity is decomposed into vectors in the X and Y directions based on the relative eccentricity angle;

[0025] The correction value is obtained based on the X-direction vector of the measured value, the X-direction vector of the relative eccentricity, the Y-direction vector of the measured value, and the Y-direction vector of the relative eccentricity.

[0026] Furthermore, the correction value is positively correlated with the X-direction vector of the measured value, the X-direction vector of the relative eccentricity, the Y-direction vector of the measured value, and the Y-direction vector of the relative eccentricity.

[0027] Furthermore, the formula for calculating the correction value is as follows:

[0028]

[0029] 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 relative eccentricity in the X direction. BM-D-Y This is the decomposition vector of the relative eccentricity in the Y direction.

[0030] (3) Beneficial effects

[0031] In summary, this invention eliminates the eccentricity between the measured section and the axis of rotation by considering the end face, cylindrical surface features, reference surface height, and the measured section and height. This achieves eccentricity correction of the engine rotating body section measurement data, making the eccentricity value obtained from the measured section data closer to the true value. Compared to the commonly used method in the field of aero-engine measurement, which involves adjusting the center and tilt of the reference surface before measurement, the eccentricity of the reference section must be adjusted to within 2 micrometers before measurement can continue. The center and tilt adjustment process is very cumbersome and time-consuming, and adjusting the center of the workpiece reference surface to 2 micrometers may take more than 20 minutes. Attached Figure Description

[0032] 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.

[0033] Figure 1 This is a schematic flowchart of an eccentricity correction method for measuring the cross-section of an engine rotating body, provided by an embodiment of the present invention. Detailed Implementation

[0034] 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, and any modifications, substitutions and improvements to the parts, components and connection methods are covered without departing from the spirit of the present invention.

[0035] 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.

[0036] 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.

[0037] Figure 1 This is a flowchart illustrating an eccentricity correction method for measuring the cross-section of an engine rotating body based on end cylindrical surface features, provided by an embodiment of the present invention. The method may include the following steps:

[0038] S100. After centering and tilting with the end face and cylindrical surface of the engine rotating body as reference, record the tilt amount, tilt angle, tilt radius of the reference end face, and the eccentricity and eccentricity angle of the reference cylindrical surface.

[0039] Specifically, for the self-alignment and tilting situation adopted, the self-alignment and tilting are performed by utilizing the characteristics of the end cylinder surface (the tilt value of the reference end surface and the eccentricity value of the reference cylinder surface). After the self-alignment and tilting are completed, the tilt value of the reference end surface (including the tilt amount, tilt angle, and tilt measurement radius) and the eccentricity value of the reference cylinder surface (including the eccentricity amount and eccentricity angle) are recorded.

[0040] S200. Measure the cross-section to be measured and record the height, measured value and measurement angle of the cross-section.

[0041] Specifically, the cross-section under test is measured, and the measurement data (including the measured value and the measured angle) is recorded. The height of the cross-section under test is also recorded.

[0042] S300. Based on the height of the reference end face, the height of the measured section, the inclination, the inclination angle, the inclination radius, the eccentricity, and the eccentricity angle, determine the relative eccentricity and relative eccentricity angle of the measured section relative to the reference cylindrical surface.

[0043] Specifically, the relative eccentricity is positively correlated with the tilt, the cosine of the tilt angle, the eccentricity, the cosine of the eccentricity angle, and the height difference between the measured section and the reference end face; however, the relative eccentricity is inversely correlated with the tilt radius. The relative eccentricity is positively correlated with the sine of the tilt angle and the sine of the eccentricity angle; however, the relative eccentricity is inversely correlated with the cosine of the tilt angle and the cosine of the eccentricity angle.

[0044] The formula for calculating the relative eccentricity is as follows:

[0045]

[0046] The formula for calculating the relative eccentricity is as follows:

[0047]

[0048] In the formula, θ BM-D H is the relative eccentricity angle of the measured cross section relative to the reference cylindrical surface. D H is the height of the reference end face. BM L is the height of the measured section. CC For the skewness, θ CC R is the tilt angle. CC To measure the tilt radius, L D For the eccentricity, θ D It is an off-center angle.

[0049] S400. Determine the correction value based on the relative eccentricity and relative eccentricity angle.

[0050] Specifically, this step includes the following steps:

[0051] S401. Decompose the measured value into vectors in the X and Y directions according to the measurement angle;

[0052] S402. Decompose the relative eccentricity into vectors in the X and Y directions based on the relative eccentricity angle;

[0053] S403. Based on the X-direction vector of the measured value, the X-direction vector of the relative eccentricity, the Y-direction vector of the measured value, and the Y-direction vector of the relative eccentricity, obtain the correction value.

[0054] Among them, the correction value is positively correlated with the X-direction vector of the measured value, the X-direction vector of the relative eccentricity, the Y-direction vector of the measured value, and the Y-direction vector of the relative eccentricity.

[0055] The formula for calculating the correction value is as follows:

[0056]

[0057] 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 relative eccentricity in the X direction. BM-D-Y This is the decomposition vector of the relative eccentricity in the Y direction.

[0058] S500, perform eccentricity correction on the measured section based on the correction value.

[0059] Specifically, calculate the correction values ​​for all points on the measured cross section according to the steps described above to complete the correction.

[0060] Example 1

[0061] (1) To carry out the cross-section measurement of a certain engine rotating body, firstly, the tilt and eccentricity values ​​of the reference end face and the reference cylindrical surface are used for self-alignment and tilting.

[0062] (2) After the self-alignment and tilting are completed, record the tilt value of the reference end face (including the tilt amount L). CC =0.0022, tilt angle θ CC =65.27°, tilt radius R CC =200), and the eccentricity of the reference cylinder (including the eccentricity L). D =0.005 and eccentricity θ D =30°).

[0063] (3) Measure the cross-section to be measured and record the measurement data (including the measured value and the measured angle), and at the same time record the height H of the cross-section to be measured. BM =100.

[0064] (4) Calculate the eccentricity of the measured section relative to the reference plane. The specific method is as follows: Let the height of the reference end face be H. D =0, the eccentricity and eccentricity angle of the measured section relative to the reference plane are L. BM-D and θ BM-D The calculation is as follows, based on the formula:

[0065]

[0066]

[0067] (5) Correct the measurement data based on the eccentricity of the reference cylinder. The specific method is as follows: Let the measured value D BM =0.01, the 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 LBM-D-Y =0.0025, add the Y-direction vector of the measured value to the Y-direction vector of the eccentricity, and calculate the correction value at that angle. The calculation formula is as follows:

[0068]

[0069] (6) Calculate the correction values ​​for all points on the measured section according to the above steps to complete the correction.

[0070] 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.

[0071] 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 end cylindrical surface features, characterized in that, The method includes the following steps: After centering and tilting with the end face and cylindrical surface of the engine rotating body as reference, record the tilt amount, tilt angle, tilt radius of the reference end face, and the eccentricity and eccentricity angle of the reference cylindrical surface. Measure the cross-section being measured, and record the height, measured value, and measurement angle of the cross-section being measured; Based on the height of the reference end face, the height of the measured section, the inclination amount, the inclination angle, the inclination measurement radius, the eccentricity, and the eccentricity angle, the relative eccentricity and relative eccentricity angle of the measured section relative to the reference cylindrical surface are determined; the calculation formulas for the relative eccentricity and relative eccentricity angle are as follows: In the formula, L BM-D θ is the relative eccentricity of the measured cross section relative to the reference cylindrical surface. BM-D H is the relative eccentricity angle of the measured cross section relative to the reference cylindrical surface. D H is the height of the reference end face. D =0, H BM L is the height of the measured section. CC For the skewness, θ CC R is the tilt angle. CC To measure the tilt radius, L D For the eccentricity, θ D It is an off-center angle; Based on the relative eccentricity and the relative eccentricity angle, a correction value is determined; specifically as follows: the measured value is decomposed into vectors in the X and Y directions according to the measured angle; the relative eccentricity is decomposed into vectors in the X and Y directions according to the relative eccentricity angle; based on the vectors in the X direction of the measured value, the vector in the X direction of the relative eccentricity, the vector in the Y direction of the measured value, and the vector in the Y direction of the relative 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 relative eccentricity in the X direction. BM-D-Y Let be the vector of relative eccentricity in the Y direction; The eccentricity of the measured cross section is corrected based on the correction value.

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