Multi-stage rotor and stator measuring and assembling method based on unification of measuring benchmark and assembling benchmark

Abstract

The invention provides a multi-stage rotor and stator measuring and assembling method based on unification of a measuring reference and an assembling reference, and particularly belongs to the technical field of aerospace engines. Measurement and assembly benchmark errors can be reduced through measurement and assembly integration, evaluation data are fed back to a measurement and assembly system, aerospace engine rotor and stator assembly precision regulation and control based on data guidance can be achieved, unification of a measurement benchmark and an assembly benchmark can be guaranteed, benchmark deviation between assembly and measurement can be effectively removed, and measurement accuracy is improved. Actual measurement of the rotor and the stator can be achieved while installation and detection are conducted, data can be used for geometric error evaluation and assembly prediction, and feasibility of the method for achieving rapid measurement evaluation and accurate assembly prediction of geometric parameters while installation and detection is conducted is proved. The device comprises a measuring rotary table, an assembling chuck, a center and inclination adjusting table and a measuring sensor. A center and inclination adjusting table is installed on the top face of the measuring rotary table, an assembling chuck is arranged on the top face of the center and inclination adjusting table, stand columns are fixedly installed on the two sides of the top face of the measuring rotary table, cross arms are installed on the two stand columns, and measuring sensors are installed at one ends of the cross arms.

Description

TECHNICAL FIELD

[0001] The application relates to a multi-stage rotor-stator measurement and assembly method based on measurement datum and assembly datum unification, and particularly belongs to the technical field of aerospace engines. BACKGROUND

[0002] The aerospace engine is a product integrating high-new and cutting-edge technologies in the fields of aerospace manufacturing, and its research and production capacity is currently mastered by only a few countries in the world. The aerospace engine has important positions in military and economy due to its characteristics of high technology concentration, high investment and high added value. The aerospace engine mainly comprises a turbine passage, a rocket ramjet combined combustion chamber and a combined cycle rocket engine. The engine operates in a harsh environment of high temperature and high pressure, and therefore extremely high reliability is required for the whole engine. The turbine passage is the core of the aerospace engine, and is composed of a turbine, an intermediate casing and other rotor-stator components. During assembly, the central transmission shaft is used as the assembly datum, and the rotor and the stator are alternately assembled.

[0003] Publication No. "CN111664124A" is a stator structure, a rotor-stator assembly structure and an assembly method thereof, which comprises a stator casing, the inner wall of the stator casing has an annular limiting groove; two half-ring edge rings are arranged on the inner side of the stator casing and are in abutment with each other to form an edge ring; one end of the edge ring is clamped into the annular limiting groove; two half-ring stator inner rings are in abutment with each other to form a stator inner ring; each half-ring stator inner ring is arranged in a corresponding half-ring edge ring; two groups of stator blades are arranged in a corresponding half-ring edge ring and a corresponding half-ring stator inner ring along the circumferential direction, the blade tips of the stator blades are formed on the inner wall of the corresponding half-ring edge ring, and the blade roots are formed on the outer wall of the corresponding half-ring stator inner ring. In the traditional assembly process, the engine measurement and assembly stations are separated from each other, and the operating workers continuously adjust the poses of the rotor and the stator based on offline rotor-stator surface runout data to improve the assembly precision. The current "measurement and assembly separation" process seriously depends on the experience of the assembly workers due to the lack of a reliable datum unification model as a reference, and the different measurement and assembly datums also reduce the repeatability of the assembly precision index. SUMMARY

[0004] The purpose of the present application is to provide a multi-stage rotor-stator measurement and assembly method based on measurement datum and assembly datum unification, so as to solve the problem of insufficient measurement and assembly precision caused by the non-unification of the measurement and assembly datums during the measurement and assembly of the multi-stage rotor-stator.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows: the present application comprises a measurement turntable, an assembly chuck, a centering and tilting table and a measurement sensor. The top surface of the measuring rotary table is provided with a centering and tilting table, the top surface of the centering and tilting table is provided with an assembly chuck, and the two sides of the top surface of the measuring rotary table are fixedly provided with stand columns, the two stand columns are provided with horizontal arms, one end of the horizontal arm is provided with a measuring sensor, and the measuring sensor is arranged above the assembly chuck.

[0006] The specific steps of the multi-stage rotor-stator measurement and assembly method based on the unity of the measurement reference and the assembly reference include: Step one: establishing a unified model of the measurement reference and the assembly reference; Step two: establishing a rapid measurement and evaluation system of roundness, concentricity, coaxiality, perpendicularity and flatness geometric form and position error based on the measured data; Step three: researching an online assembly prediction method based on geometric characteristic data; Further, the unified model established in step one includes the construction of the measurement reference and the cooperative measurement and assembly of the rotor-stator components, the rotor-stator components include bearing inner rings and bearing outer rings, the bearing inner rings and the bearing outer rings are correspondingly arranged, and the bearing outer ring assembly surface of the rotor-stator is taken as the measurement surface during measurement.

[0007] Further, the evaluation system in step two is rapidly evaluated in real time through the least square algorithm and will be fed back to the measurement and assembly system.

[0008] Further, the measured data in step two is the shape and position error data of the rotor-stator single component collected by using the measuring sensor, and the shape and position error data specifically includes: The angle during measurement of the multi-stage component obtained by the precision angle acquisition module and the analog signals of the lever probe module and the telescopic probe module collected by the precision measurement signal acquisition module.

[0009] Further, the high-speed signal modulation and demodulation unit accurately converts the multi-source data signals into digital adjustable signals, and transmits the signals to the software for parameter evaluation of the shape and position error data.

[0010] Further, the prediction method in step three is to obtain the deviation angle of the rotor-stator by using the tilt straight line equation based on the measurement reference and the assembly reference, so as to analyze the influence of the deviation angle and the component height on the assembly deviation caused by the reference deviation error.

[0011] The beneficial effects of the present application are: Through the measurement and assembly integration, the measurement and assembly reference error can be reduced, the evaluation data can be fed back to the measurement and assembly system, the data guidance based air and space engine rotor-stator assembly precision control can be realized, the unity of the measurement reference and the assembly reference can be ensured, the reference deviation between assembly and measurement can be effectively removed, the real measurement of the rotor-stator can be realized, the data can be used for geometric error evaluation and assembly prediction, and the feasibility of the rapid measurement and evaluation and accurate assembly prediction method of the geometric parameters of the edge assembly and edge detection is proved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of a multi-stage rotor-stator measurement and assembly device based on the unification of measurement datum and assembly datum of the present invention; Figure 2 This is a schematic diagram of the coordinated assembly of the rotor and stator components of the present invention; Figure 3 This is a schematic diagram of the present invention's rapid measurement and evaluation of geometric parameters during installation and inspection, and accurate assembly prediction; Figure 4 Schematic diagram of the distribution of the measuring and mounting axes and centroid axes of the three-level components of the present invention in space; Figure 5 Schematic diagram showing the influence of component radius and component height on reference error characteristics of the present invention; Figure 6 It is a schematic diagram of the coordinated measurement of the rotor and stator components of the present invention.

[0013] 1. Measuring turntable; 2. Assembly chuck; 3. Bearing inner ring; 4. Bearing outer ring; 5. Centering and tilting table; 6. Measuring sensor. DETAILED DESCRIPTION

[0014] The following will be combined with the Figure 1-6 , clearly and completely describe the technical solutions in the embodiments.

[0015] Specific implementation method 1: Figure 1 As shown, the specific steps of the multi-stage stator measurement and assembly method based on the unification of measurement datum and assembly datum include: Step 1: Establish a unified model of measurement benchmark and assembly benchmark; Step 2: Establish a rapid measurement and evaluation system for geometric errors of roundness, concentricity, coaxiality, perpendicularity, and flatness based on measured data; Step 3: Study the online assembly prediction method based on geometric characteristic data; The device is constructed by including a measuring turntable 1, an assembly chuck 2, a centering and tilting table 5 and a measuring sensor 6; the top surface of the measuring turntable 1 is equipped with a centering and tilting table 5, the top surface of the centering and tilting table 5 is equipped with an assembly chuck 2, the assembly chuck 2 is equipped with a bearing inner ring 3 and a bearing outer ring 4 in sequence from the inside to the outside, the bearing inner ring 3 and the bearing outer ring 4 are arranged correspondingly, columns are fixedly installed on both sides of the top surface of the measuring turntable 1, and cross arms are installed on both columns. A measuring sensor 6 is installed at one end of the cross arm, and the measuring sensor 6 is arranged above the assembly chuck 2 The measurement datum is primarily constructed from the measurement turntable 1 itself, and the assembly datum is coaxial with the measurement datum via a custom assembly chuck 2. The measurement datum is perpendicular to the datum plane of the measured rotor and stator via a centering and tilting table 5. Therefore, the linear equation can be solved by analyzing the inclination of the datum plane: (1) In formula (1): θ x is the tilt angle of the X axis; θ y is the tilt angle of the Y axis.

[0016] As Figure 2 and Figure 6 shown, the main operation process for realizing collaborative edge measurement and edge detection based on the measurement reference is as follows: first, install the intermediate bearing inner ring 3, and cooperate the bearing inner ring 3 and the bearing outer ring 4 based on the intermediate stator reference. Perform centering and tilting based on the centering and tilting table 5, evaluate the geometric and positional errors of the rotor-stator combination, and install the rotor-stator alternately based on the assembly process; When measuring, take the stator outer ring assembly surface as the measurement surface to determine the overall geometric and positional errors. The phase of component installation is the same as that of the previous component installation and adjustment. The stator can only be fine-tuned by adjusting the bolt holes of the first stator and the last stator. After one end is completed, evaluate the one-side coaxiality based on the intermediate bearing and the bearing at the other end. After installation and adjustment are completed, evaluate the overall geometric and positional errors based on the bearings at both ends, and finally complete the collaborative measurement and assembly of the rotor-stator components; The geometric and positional error evaluation of the rotor-stator roundness, concentricity, coaxiality, perpendicularity and flatness is based on real-time and rapid evaluation of the measured data through least squares algorithm, and is fed back to the measurement and assembly system, so as to realize the precision control of the space engine rotor-stator assembly based on data guidance.

[0017] The implementation process is shown in Figure 3 , and the specific operation includes using the measurement sensor 6 to collect the geometric and positional error data of the single-stage component, i.e. collecting error data signals based on a high-precision multi-channel data acquisition card, including the angle obtained by the precision angle acquisition module during measurement of the multi-stage component, analog signals collected by the precision measurement signal acquisition module, lever probe module, telescopic probe module, etc. The high-speed signal modulation and demodulation unit accurately converts the multi-source data signals into digital adjustable signals. When the measurement and assembly reference is unified, the signals are transmitted to the software for geometric and positional error parameter evaluation, and then the geometric and positional error evaluation value is input into the assembly error and prediction module to guide the assembly.

[0018] Specific implementation method two: as Figure 4-5 shown, the deviation angle is obtained based on the tilt straight line equation of the measurement reference and the assembly reference, and the influence of the deviation angle and the component height on the assembly deviation caused by the reference deviation error is analyzed. The initial coaxiality of the component can be set to 10 μm, the tilt angle range is 0-10", the component height range is 10-120 mm, and the component radius is 15-20 mm.

[0019] The measurement and assembly integration can reduce the measurement and assembly reference error, but the measurement cannot realize the consistency in ideal condition, and thus the measurement and assembly reference error is also caused. Since the measurement and assembly reference error cannot be directly measured, the error separation method based on optimization can be used to separate the measurement and assembly reference deviation. The pure measured data can be obtained after the separation, and the data can support the rapid measurement and evaluation of geometric parameters. The evaluation data is fed back to the measurement and assembly system, so that the precision regulation and control of the space engine rotor-stator assembly based on data guidance is realized.

[0020] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as the above preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any simple modification, equivalent replacement and improvement of the above embodiments, which are within the scope of the present application, the technical essence of the present application, and the spirit and principles of the present application, are still within the protection scope of the present application.

Claims

1. A multi-stage rotor-stator measurement and assembly device based on the unification of measurement datum and assembly datum, characterized in that: It includes a measuring turntable (1), an assembly chuck (2), a centering and tilting table (5) and a measuring sensor (6); A centering and tilting platform (5) is installed on the top surface of the measuring turntable (1), an assembly chuck (2) is provided on the top surface of the centering and tilting platform (5), columns are fixedly installed on both sides of the top surface of the measuring turntable (1), a cross arm is installed on each of the two columns, a measuring sensor (6) is installed at one end of the cross arm, and the measuring sensor (6) is arranged above the assembly chuck (2).

2. The multi-stage rotor-stator measurement and assembly method based on the unification of measurement datum and assembly datum according to claim 1 is characterized in that: The specific steps include: Step 1: Establish a unified model of measurement benchmark and assembly benchmark; Step 2: Establish a rapid measurement and evaluation system for geometric errors of roundness, concentricity, coaxiality, perpendicularity, and flatness based on measured data; Step 3: Study the online assembly prediction method based on geometric characteristic data.

3. The multi-stage rotor-stator measurement and assembly method based on the unification of measurement datum and assembly datum according to claim 2 is characterized in that: The unified model established in step 1 includes the construction of a measurement benchmark and the coordinated measurement and assembly of the rotor-stator components. The rotor-stator components include a bearing inner ring (3) and a bearing outer ring (4). The bearing inner ring (3) and the bearing outer ring (4) are set in correspondence. During measurement, the assembly surface of the bearing outer ring (4) of the rotor-stator is used as the measurement surface.

4. The multi-stage rotor-stator measurement and assembly method based on the unification of measurement datum and assembly datum according to claim 2, characterized in that: The evaluation system in step 2 is evaluated quickly and in real time through least squares and other algorithms, and is fed back to the measurement and assembly system.

5. The multi-stage rotor-stator measurement and assembly method based on the unification of measurement datum and assembly datum according to claim 2, characterized in that: The measured data in step 2 is the shape and position error data of the stator-rotor single-stage component collected by the measuring sensor (6). The shape and position error data specifically include: The precision angle acquisition module obtains the angle during multi-level component measurement, and the precision measurement signal acquisition module acquires analog signals from the lever probe module and the telescopic probe module.

6. The multi-stage rotor-stator measurement and assembly method based on the unification of measurement datum and assembly datum according to claim 2, characterized in that: The high-speed signal modulation and demodulation unit accurately converts multi-source data signals into digitally adjustable signals and transmits the signals to the software for parameter evaluation of form and position error data.

7. The multi-stage rotor-stator measurement and assembly method based on the unification of measurement datum and assembly datum according to claim 2, characterized in that: The prediction method in step three is to calculate the deviation angle of the stator based on the inclined straight line equation between the measurement datum and the assembly datum, so as to analyze the influence of the deviation angle and component height on the assembly deviation caused by the datum offset error.

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