Measuring method for upper and lower end faces of rotary body parts based on combination of geometric quantity and roundness

Abstract

This invention relates to the field of contact measurement technology, specifically to a method for measuring the upper and lower end faces of a rotating part based on a combination of geometric quantities and roundness. The method includes the following steps: placing the probe on the upper end face of a standard ring and recording the values ​​of a height sensor and a probe inductance meter; placing the probe on the lower end face of the standard ring and recording the values ​​of the height sensor and the probe inductance meter; calculating the end face error of the standard ring based on the height difference between the upper and lower end faces and the measurement data; placing the probe on the upper end face of the rotating part and recording the values ​​of the height sensor and the probe inductance meter; placing the probe on the lower end face of the rotating part and recording the values ​​of the height sensor and the probe inductance meter; and calculating the distance between the upper and lower end faces of the rotating part based on the end face error and the measurement data. The purpose of this method for measuring the upper and lower end faces of a rotating part based on a combination of geometric quantities and roundness is to solve the problem that traditional contact measurements of rotating parts cannot simultaneously and accurately measure form and position errors and geometric parameters.

Description

Technical Field

[0001] This invention relates to the field of contact measurement technology, and more specifically to a method for measuring the upper and lower end faces of a rotating part based on a combination of geometric quantities and roundness. Background Technology

[0002] Existing contact measurement technologies for rotating parts fall into two categories: one is the geometric measurement method, the most representative of which is the coordinate measuring machine (CMM). This method acquires coordinate points in the X, Y, and Z dimensions to fit the shape of the workpiece and obtain its geometric information. The other is the roundness measurement method, the most representative of which is the roundness meter. This method acquires angle values ​​and measurements on the surface of the rotating body and evaluates the cross-sectional data of the workpiece in polar coordinates.

[0003] Both geometric measurement methods (such as those using coordinate measuring machines, CMMs) and roundness measurement methods have their limitations when measuring rotating parts. While CMMs can meet the requirements for traditional part dimensional measurements, they are ineffective for measuring roundness-related shape parameters of multiple rotating cross-sections, such as roundness, runout, maximum runout, the angle corresponding to the maximum runout, minimum runout, and the angle corresponding to the minimum runout. The difficulty lies in the fact that CMMs can hardly collect the runout value of a complete circular cross-section. Even if they can, due to the working characteristics of CMMs, a reference circle needs to be defined first, and then several points need to be selected on the circle for measurement. If 360 or more points are selected, the measurement time will be very long. Therefore, traditional CMMs are not suitable for measuring accurate shape parameters related to the roundness of circular cross-sections of rotating parts in terms of accuracy and efficiency, and are therefore unsuitable for measuring engine blade tip clearance. On the other hand, roundness testers can collect data from a complete cross section, so they can accurately calculate the form and position errors of rotating parts, such as roundness, runout, maximum runout, the angle corresponding to the maximum runout, minimum runout, and the angle corresponding to the minimum runout. However, roundness testers do not have calibrable geometric data, so they cannot measure and calculate the geometric parameters of rotating parts, and therefore are not suitable for measuring the gap between engine rotor and stator blades.

[0004] Therefore, the inventors have provided a method for measuring the upper and lower end faces of a rotating part based on a combination of geometric quantities and roundness. Summary of the Invention

[0005] (1) Technical problems to be solved

[0006] This invention provides a method for measuring the upper and lower end faces of a rotating part based on a combination of geometric quantities and roundness, which solves the technical problem that traditional contact measurement of rotating parts cannot simultaneously perform accurate measurement of form and position errors and geometric parameters.

[0007] (2) Technical solution

[0008] This invention provides a method for measuring the upper and lower end faces of a rotating part based on a combination of geometric quantities and roundness, comprising the following steps:

[0009] Fix the probe's position and place it on the upper surface of the standard ring. Record the first value of the height sensor and the second value of the probe's inductance meter.

[0010] Maintaining the probe's position, place the probe on the lower end face of the standard ring, and record the third value of the height sensor and the fourth value of the probe inductance meter.

[0011] The end face error of the standard ring is calculated based on the height difference between the upper and lower end faces of the standard ring, the first value, the second value, the third value, and the fourth value.

[0012] Maintaining the probe's position, place the probe on the upper surface of the rotating part, and record the fifth value of the height sensor and the sixth value of the probe inductance meter.

[0013] Maintain the probe's position and place it on the lower end face of the rotating part. Record the seventh value of the height sensor and the eighth value of the probe inductance meter.

[0014] The distance between the upper and lower end faces of the rotating part is calculated based on the end face error, the fifth value, the sixth value, the seventh value, and the eighth value.

[0015] Furthermore, the end face error of the standard ring is positively correlated with the first value, the second value, and the fourth value, and the end face error of the standard ring is negatively correlated with the third value.

[0016] Furthermore, the formula for calculating the end face error of the standard ring is as follows:

[0017] e = (H TS +a TS )-(H BS -a BS )-E;

[0018] In the formula, e is the end face error of the standard ring, and H TS For the first value, a TS H is the first value. BS For the third value, a BS The fourth value is E, where E is the height difference between the upper and lower end faces of the standard ring.

[0019] Furthermore, the distance between the upper and lower end faces of the rotating part is positively correlated with the fifth, sixth, and eighth values, and the distance between the upper and lower end faces of the rotating part is negatively correlated with the seventh value.

[0020] Furthermore, the formula for calculating the distance between the upper and lower end faces of the rotating part is as follows:

[0021] d=(H TM +a TM )-(H BM -a BM )-e;

[0022] In the formula, d is the distance between the upper and lower end faces of the rotating part, and H is... TM For the first value, a TM H is the first value. BM For the third value, a BM The fourth value is denoted as 'e', ​​where 'e' is the end face error of the standard ring.

[0023] Furthermore, the height difference between the upper and lower end faces of the standard ring is a known value.

[0024] Furthermore, the probe inductance meter is used to measure roundness.

[0025] Furthermore, the roundness is calculated by rotating the rotating part on an air-bearing turntable and reading the inductance meter reading pressed onto the rotating part.

[0026] (3) Beneficial effects

[0027] In summary, this invention achieves simultaneous measurement of the distance between the upper and lower end faces of a rotating part (e.g., the blade tip clearance between the rotor and stator blades of an engine) and shape parameters related to roundness (e.g., roundness, runout, maximum runout value, angle corresponding to the maximum runout value, minimum runout value, angle corresponding to the minimum runout value, etc.) by combining the measurement method of the radius and roundness of the rotating part. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a flowchart illustrating a method for measuring the upper and lower end faces of a rotating part based on a combination of geometric quantities and roundness, as provided in an embodiment of the present invention.

[0030] Figure 2This is a schematic diagram of the calibration and measurement structure of a standard ring for measuring engine blade tip clearance based on a combination of geometric quantities and roundness, provided in Embodiment 1 of the present invention.

[0031] Figure 3 This is a schematic diagram of the structure of a measuring device for engine blade tip clearance based on a combination of geometric quantities and roundness, provided in Embodiment 1 of the present invention.

[0032] In the picture:

[0033] 1-Standard ring; 2-Self-aligning table; 3-Probe; 4-Rotating parts. 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.

[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] Figure 1 This is a flowchart illustrating a method for measuring the upper and lower end faces of a rotating part based on a combination of geometric quantities and roundness, according to an embodiment of the present invention. The method may include the following steps:

[0037] S100. Fix the probe position and place the probe 3 on the upper surface of the standard ring 1. Record the first value of the height sensor and the second value of the probe inductance meter.

[0038] Specifically, the height difference between the upper and lower end faces of standard ring 1 is a known value, and the inductance meter is used to measure roundness. The rotating part 4 is carried on an air-bearing turntable and rotated. The inductance meter reading pressed against the rotating part 4 is then used to calculate roundness. The specific measurement process for the relevant geometric quantities and roundness of the upper end face of standard ring 1 is not detailed here.

[0039] S200. Maintain the probe's position and place probe 3 on the lower end face of standard ring 1. Record the third value from the height sensor and the fourth value from the probe inductance meter. The specific procedures for measuring the relevant geometric quantities and roundness of the lower end face of standard ring 1 are not detailed here.

[0040] S300. Based on the height difference between the upper and lower end faces of standard ring 1, the first value, the second value, the third value, and the fourth value, calculate the end face error of standard ring 1.

[0041] Specifically, the end face error of standard ring 1 is positively correlated with the first, second, and fourth values, and the end face error of standard ring 1 is negatively correlated with the third value.

[0042] The formula for calculating the end face error of the standard ring is as follows:

[0043] e = (H TS +a TS )-(H BS -a BS )-E;

[0044] In the formula, e is the end face error of the standard ring, and H TS As the first value, a TS H is the first value. BS The third value, a BS E is the fourth value, where E is the height difference between the upper and lower end faces of the standard ring.

[0045] S400. Maintain the probe's position and place probe 3 on the upper surface of the rotating part 4. Record the fifth value of the height sensor and the sixth value of the probe inductance meter. The specific process for measuring the relevant geometric quantities and roundness of the upper surface of the rotating part 4 will not be elaborated.

[0046] S500. Maintain the probe's position and place probe 3 on the lower end face of the rotating part 4. Record the seventh value of the height sensor and the eighth value of the probe inductance meter. The specific process for measuring the relevant geometric quantities and roundness of the lower end face of the rotating part 4 will not be elaborated.

[0047] S600. Based on the end face error, the fifth value, the sixth value, the seventh value and the eighth value, calculate the distance between the upper and lower end faces of the rotating part 4.

[0048] Specifically, the distance between the upper and lower end faces of the rotating part 4 is positively correlated with the fifth, sixth, and eighth values, and the distance between the upper and lower end faces of the rotating part 4 is negatively correlated with the seventh value.

[0049] The formula for calculating the distance between the upper and lower end faces of the rotating part 4 is as follows:

[0050] d=(H TM +a TM )-(H BM -a BM )-e;

[0051] In the formula, d is the distance between the upper and lower end faces of the rotating part, and H is... TM As the first value, a TM H is the first value. BM The third value, a BM The fourth value is denoted by 'e', ​​where 'e' represents the end face error of the standard ring.

[0052] Example 1

[0053] Measure the distance between the upper and lower end faces of the rotating part 4, using methods such as... Figure 3 The measuring device shown has the rotating part 4 placed on the self-aligning table 2:

[0054] (1) The height difference between the upper and lower sections of standard ring 1 is E = 20;

[0055] (2) Figure 2 As shown, with the probe in a fixed position, place the probe on the upper surface of the standard ring 1 and record the height sensor value H. TS =29.81 and the value of the probe inductance meter a TS =0.2;

[0056] (3) Maintain the probe position, place probe 3 on the lower end face of standard ring 1, and record the height sensor value H. BS =10.19 and the probe inductance meter value a BS =0.2;

[0057] (4) Calculate the end face error e = (H TS +a TS )-(H BS -a BS -E = 0.02;

[0058] (5) Maintain the probe position, place probe 3 on the upper surface of rotating part 4, and record the height sensor value H. TM =50 and the value of the probe inductance meter a TM =0.2;

[0059] (6) Maintain the probe position, place probe 3 on the lower end face of rotating part 4, and record the height sensor value H. BM =40 and the value of the probe inductance meter a BM =0.1;

[0060] (7) Calculate the distance between the upper and lower end faces of the rotating part 4.

[0061] d=(H TM +a TM )-(H BM -a BM )-e=10.28.

[0062] 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.

[0063] 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 measuring the upper and lower end faces of a rotating part based on a combination of geometric quantities and roundness, characterized in that, The method includes the following steps: Fix the probe's position and place it on the upper surface of the standard ring. Record the first value of the height sensor and the second value of the probe's inductance meter. Maintaining the probe's position, place the probe on the lower end face of the standard ring, and record the third value of the height sensor and the fourth value of the probe inductance meter. Based on the height difference between the upper and lower end faces of the standard ring, the first value, the second value, the third value, and the fourth value, the end face error of the standard ring is calculated; the formula for calculating the end face error of the standard ring is: e = (H TS +a TS )-(H BS -a BS )-E; where e is the end face error of the standard ring, H TS For the first value, a TS H is the second value. BS For the third value, a BS The fourth value is E, which is the height difference between the upper and lower end faces of the standard ring. The height difference between the upper and lower end faces of the standard ring is a known value. Maintaining the probe's position, place the probe on the upper surface of the rotating part, and record the fifth value of the height sensor and the sixth value of the probe inductance meter. Maintain the probe's position and place it on the lower end face of the rotating part. Record the seventh value of the height sensor and the eighth value of the probe inductance meter. Based on the end face error of the standard ring, the fifth value, the sixth value, the seventh value, and the eighth value, the distance between the upper and lower end faces of the rotating part is calculated; the formula for calculating the distance between the upper and lower end faces of the rotating part is: d = (H TM +a TM )-(H BM -a BM )-e; where d is the distance between the upper and lower end faces of the rotating part, H TM For the fifth value, a TM H is the sixth value. BM For the seventh value, a BM The eighth value is denoted as 'e', ​​where 'e' is the end face error of the standard ring.

2. The method for measuring the upper and lower end faces of a rotating part based on a combination of geometric quantities and roundness according to claim 1, characterized in that, The probe inductance meter is used to measure roundness.

3. The method for measuring the upper and lower end faces of a rotating part based on a combination of geometric quantities and roundness according to claim 2, characterized in that, The roundness is calculated by rotating the rotating part on an air-bearing turntable and reading the inductance meter reading of the probe pressed onto the rotating part.

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