CN111060057A - Turbine blade profile measuring method based on three-coordinate measuring machine - Google Patents
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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Abstract
The invention relates to the field of aero-engines, in particular to a turbine blade profile measuring method based on a three-coordinate measuring machine, which comprises the following steps: establishing a coordinate system on a three-coordinate measuring machine according to the blade design positioning points and evaluating and verifying; acquiring blade profile theoretical curve data and manufacturing a theoretical file according to the theoretical height of each section of the blade; setting blade profile measurement parameters; planning and setting measurement control points of each section according to the self curved surface condition and the measurement requirement of the blade: and (4) measuring the leaf profile. By utilizing an advanced high-precision three-coordinate measuring machine and configuring special PCDMIS measuring software, blade analysis software and bladerunner user interface operation software, the blade coordinate system establishing, blade profile theoretical data obtaining and manufacturing, measuring and analyzing functions are integrated, and the blade profile measuring device is used for blade profile measurement of a single-unit turbine working blade with a slit and a multi-unit guide blade, can comprehensively evaluate various parameters, effectively feeds back manufacturing quality and meets the production and processing requirements.
Description
Technical Field
The invention relates to the field of aero-engines, in particular to a turbine blade profile measuring method based on a three-coordinate measuring machine.
Background
At present, an aeroengine turbine working blade with a split seam and a concatemer turbine guide blade are important components of a turbine part and are also important key parts of the whole engine, the aeroengine turbine working blade with the split seam and the concatemer turbine guide blade are large in number of parts, high in precision requirement on geometric dimension of a precisely cast blade profile and large in evaluation parameters, the dimensional quality of the blade profile influences various parameters of an air inlet of the turbine part, the dimensional parameters of the blade profile are comprehensively evaluated, the dimensional quality of the appearance is strictly guaranteed, and a turbine blade profile measuring method based on a three-coordinate measuring machine is provided against the background.
Disclosure of Invention
The invention aims to provide a method for effectively measuring the blade profile of a working blade of a turbine with a split seam, which is effectively and flexibly applied to the measurement of the blade profile of a concatemer guide blade and can comprehensively analyze and evaluate the measurement data on special blade analysis software to evaluate the size and the quality of the blade profile.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a turbine blade profile measuring method based on a three-coordinate measuring machine comprises the following steps:
(1) establishing a coordinate system on a three-coordinate measuring machine according to the blade design positioning points and evaluating and verifying: establishing an iterative coordinate system according to the design positioning points of the blade casting, evaluating XYZ coordinate data, and verifying that the position deviation is smaller than the set positioning tolerance;
(2) obtaining Blade profile theoretical curve data and making a theoretical file according to the theoretical height of each section of the Blade, namely obtaining the Blade theoretical curve data in the PCDMIS and making a Blade theoretical file in Blade software;
(3) setting blade profile measurement parameters: creating an algorithm file and a tolerance file according to measurement requirements, and determining the tolerance of each parameter according to the design tolerance requirement of the blade;
(4) planning and setting measurement control points of each section according to the self curved surface condition and the measurement requirement of the blade:
a. if the single-body turbine working blade with the split seam is measured, each section blade profile is measured in four sections, the section blade profiles comprise a blade basin, a blade back, a front edge and a tail edge, the blade basin, the blade back, the front edge and the tail edge are spliced into a complete blade profile after the measurement is finished by measuring pins with different angles, and bladerunner software is used for converting blade profile data and then analyzing blade profile parameters and comparing theoretical blade profiles by blade;
b. if the measured concatemer turbine guide blade is measured, setting to execute multi-section measurement, setting a plurality of control points, writing a text document according to the section sequence, and calling the text document to plan a scanning path through a PCDMIS blade measuring program;
(5) and (3) blade profile measurement:
after the steps are completed, the bladerunner software is opened, a blade measuring program needing to be measured is selected, all cross sections are selected, the measurement is started after the blade number is input, and a measurement report is automatically stored and printed after the measurement is finished.
Furthermore, because the passage between the blades is narrow, in the step b, the blade profile measuring point control method of the working blade of the single-body turbine with the split seam is set to execute six-section measurement, and six control points are selected.
Furthermore, in the step b, control points are increased or decreased according to the actual situation of the blade, and a safe space and a measuring seat angle are set in the measuring program.
The invention has the beneficial effects that: by utilizing an advanced high-precision three-coordinate measuring machine and configuring special PCDMIS measuring software, blade analysis software and bladerunner user interface operation software, the blade coordinate system establishment, blade profile theoretical data acquisition and manufacturing, measurement and analysis functions are integrated, and the blade profile measuring device is used for blade profile measurement of a single-unit turbine working blade with a slit and a multi-unit guide blade, can comprehensively evaluate various parameters, effectively feeds back manufacturing quality and meets the production and processing requirements; the defects that the blade profile of the working blade of the single-connected turbine with the split seam and the blade profile of the multi-connected guide blade can only be spliced in the PCDMIS multi-section measurement and cannot be analyzed in a multi-section integration mode are effectively overcome.
Drawings
FIG. 1 is a schematic diagram of a synergistic relationship of leaf profile measurements according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of coordinate system establishment according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a blade profile control point of a single-unit turbine working blade with a slit in the embodiment of the invention;
FIG. 4 is a schematic view of a multi-row turbine guide vane in an embodiment of the invention;
FIG. 5 is a schematic view of setting control points of a blade profile of a guide blade of a multi-union turbine in an embodiment of the invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but the scope of the claimed invention is not limited thereto.
Referring to fig. 1-5, a turbine blade profile measuring method based on a three-coordinate measuring machine comprises the following steps:
(1) establishing a coordinate system on a three-coordinate measuring machine according to the blade design positioning points and evaluating and verifying:
since the coordinate system of the turbine blade is not usually on the blade, the coordinate system is established by using the "3, 2, 1" iterative method, in which three points of a point a1, a point a2 and a point A3 are subjected to an alignment operation, two points of a point B4 and a point B5 are subjected to a rotation operation, and a point C6 is subjected to an origin operation. In order to obtain a more accurate establishment of the coordinate system, the target radius of the time point of establishing the coordinate system by the iterative method, the target tolerance and the number of times of increasing the iteration can be modified, as shown in fig. 2.
And evaluating the established XYZ coordinate data under the established coordinate system, and verifying the position deviation of the six-point positioning point, wherein the position deviation is smaller than the set positioning tolerance.
(2) Obtaining blade profile theoretical curve data according to the theoretical height of each section of the blade and manufacturing a theoretical file (NOM):
and acquiring Blade theoretical curve data in the PCDMIS, and making a Blade theoretical file in Blade software. The method specifically comprises the following steps: in preparation for measurement, theoretical values of the measured cross section are obtained from CAD (computer aided design) numerical models of the blade, and a high-level scanning module is used in PCDMIS (computer aided design information system) to intercept theoretical lines. Due to the particularity of the blade with the slit, the theoretical line is intercepted by using 'line-cutting scanning' to jump over the position (close to the tail edge) of the slit of the exhaust edge, and the theoretical profile is obtained. In the open-line scanning, the type of variable scanning is used, the maximum increment value and the minimum increment value are modified according to the actual situation of the blade, the data of the place (front and rear edges) with large blade profile curvature change is ensured to be more, the data of the place (basin back) with gentle curvature is proper, and in addition, the boundary condition and the section vector are required to be ensured to be correct.
According to the method, all the section theoretical values are sequentially intercepted, and all the section theoretical profile scanning commands are generated.
In the PCDMIS software, theoretical scan profile data is derived as XYZ file using a derivation function.
Nom (theoretical value file) is used for the analysis software to compare with the measured data.
Generating an NOM file according to the method; then, a theoretical value file (. nom) and a theoretical profile file (. MTH) of the leaf shape generated after creating each cross section are imported into the blank. And checking whether the contour lines are complete or abnormal.
(3) Setting blade profile measurement parameters:
an algorithm file (. FLV) is created, and parameters to be evaluated, such as maximum profile (maxform), minimum profile (minimum), chord length (chord), are determined according to blade requirements.
A tolerance file (. TOL) is created and the tolerances for each parameter are determined based on the blade design tolerance requirements.
(4) Planning and setting measurement control points of each section according to the self curved surface condition and the measurement requirement of the blade:
① single body turbine blade with slit:
the measurement of each section blade profile is completed in four sections, including a blade basin, a blade back, a front edge and a tail edge, the blade basin, the blade back, the front edge and the tail edge are spliced into a complete blade profile after the measurement is completed by measuring pins with different angles, and the blade profile parameters and the comparison theoretical blade profile are analyzed by bladerenner after bladese data are converted.
Performing four-segment measurement requires five control points, which are respectively used as the basin scanning starting point (point TE-CC2), the basin scanning end point (leading edge scanning starting point, point LE-CC), the leading edge scanning end point (leaf back scanning starting point, point LE-CV), the leaf back scanning end point (trailing edge scanning starting point, point TE-CV) and the trailing edge scanning end point (point TE-CC1), as shown in FIG. 3. And selecting the five points in the theoretical value file, writing the five points into a text document according to the sequence of the section, and calling the text document by the PCDMIS blade measurement program to plan a scanning path.
② concatemer turbine guide vanes:
referring to fig. 4, due to the narrow passage between the blades, the blade profile measuring point control method of the working blade of the reference single-unit split slit turbine is generally set to execute six-segment measurement, and six control points are selected from the points TE-CV → TE-CC, TE-CC → M-CC, M-CC → LE-CC, LE-CC → LE-CV, LE-CV → M-CV and M-CV → TE-CV, as shown in fig. 5, the seven control points are selected from a theoretical value file and written into a text document according to the sequence of the cross section, and the pcmmis blade measuring program calls the text document to plan the scanning path. Control points can be increased or decreased according to the actual situation of the blade, and a safe space and a measuring seat angle are set in a measuring program.
(5) And (3) blade profile measurement:
after the steps are completed, bladerunner software is opened, a blade measuring program needing to be measured is selected, all cross sections are selected, measurement is started after a blade number is input, and a measurement report is automatically opened after the measurement is finished.
In the invention, the measurement of the leaf profile is completed by three software in a cooperative way, PCDMIS measurement software is used for establishing a leaf coordinate system and acquiring leaf theoretical data, blade analysis software is used for analyzing various parameters of the leaf profile of the leaf, bladerunner is user interface operation software used for connecting PCDMIS and blade, and the cooperative relation of the PCDMIS and the blade is shown in figure 1.
By utilizing an advanced high-precision three-coordinate measuring machine and configuring special PCDMIS measuring software, blade analysis software and bladerunner user interface operation software, the blade coordinate system establishment, blade profile theoretical data acquisition and manufacturing, measurement and analysis functions are integrated, and the blade profile measuring device is used for blade profile measurement of a single-unit turbine working blade with a slit and a multi-unit guide blade, can comprehensively evaluate various parameters, effectively feeds back manufacturing quality and meets the production and processing requirements; the defects that the blade profile of the working blade of the single-connected turbine with the split seam and the blade profile of the multi-connected guide blade can only be spliced in the PCDMIS multi-section measurement and cannot be analyzed in a multi-section integration mode are effectively overcome.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A turbine blade profile measuring method based on a three-coordinate measuring machine is characterized by comprising the following steps:
(1) establishing a coordinate system on a three-coordinate measuring machine according to the blade design positioning points and evaluating and verifying: establishing an iterative coordinate system according to the design positioning points of the blade casting, evaluating XYZ coordinate data, and verifying that the position deviation is smaller than the set positioning tolerance;
(2) obtaining Blade profile theoretical curve data and making a theoretical file according to the theoretical height of each section of the Blade, namely obtaining the Blade theoretical curve data in the PCDMIS and making a Blade theoretical file in Blade software;
(3) setting blade profile measurement parameters: creating an algorithm file and a tolerance file according to measurement requirements, and determining the tolerance of each parameter according to the design tolerance requirement of the blade;
(4) planning and setting measurement control points of each section according to the self curved surface condition and the measurement requirement of the blade:
a. if the single-body turbine working blade with the split seam is measured, each section blade profile is measured in four sections, the section blade profiles comprise a blade basin, a blade back, a front edge and a tail edge, the blade basin, the blade back, the front edge and the tail edge are spliced into a complete blade profile after the measurement is finished by measuring pins with different angles, and bladerunner software is used for converting blade profile data and then analyzing blade profile parameters and comparing theoretical blade profiles by blade;
b. if the measured concatemer turbine guide blade is measured, setting to execute multi-section measurement, setting a plurality of control points, writing a text document according to the section sequence, and calling the text document to plan a scanning path through a PCDMIS blade measuring program;
(5) and (3) blade profile measurement:
after the steps are completed, the bladerunner software is opened, a blade measuring program needing to be measured is selected, all cross sections are selected, the measurement is started after the blade number is input, and a measurement report is automatically stored and printed after the measurement is finished.
2. The method for measuring the blade profile of a turbine blade based on a three-coordinate measuring machine as claimed in claim 1, wherein the control method of the blade profile measuring points of the working blade of the single-unit turbine with the split seam in step b is set to execute six-segment measurement and select six control points.
3. The method of claim 1, wherein the control points are increased or decreased according to the actual condition of the blade in step b, and the safety space and the measuring seat angle are set in the measuring program.
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| CN111678477A (en) * | 2020-06-20 | 2020-09-18 | 贵阳航发精密铸造有限公司 | Automatic detection and measurement method for final inspection of turbine working blade |
| CN112623262A (en) * | 2020-12-30 | 2021-04-09 | 中航贵州飞机有限责任公司 | Assembling tool installation and maintenance method |
| CN112729182A (en) * | 2021-01-19 | 2021-04-30 | 黄亮 | Method for establishing coordinate system in three-coordinate measuring electrode |
| CN113390377A (en) * | 2021-07-21 | 2021-09-14 | 中国航发成都发动机有限公司 | Three-coordinate measuring machine detection data management system |
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| CN114166160A (en) * | 2021-11-03 | 2022-03-11 | 安徽应流航源动力科技有限公司 | Method for detecting multiple blades by using single tool based on three-coordinate measuring machine |
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| CN113639700B (en) * | 2021-08-23 | 2023-10-27 | 中国航发贵阳发动机设计研究所 | Three-coordinate measuring method for throat area of turbine guide |
| CN113701665B (en) * | 2021-08-27 | 2023-08-15 | 中国航发沈阳黎明航空发动机有限责任公司 | Digital scanning measurement method for exhaust area of guide vane |
| CN113701665A (en) * | 2021-08-27 | 2021-11-26 | 中国航发沈阳黎明航空发动机有限责任公司 | Digital scanning measurement method for exhaust area of guide vane |
| CN113701606A (en) * | 2021-08-31 | 2021-11-26 | 中国航发沈阳黎明航空发动机有限责任公司 | Three-coordinate surface compensation detection method for blisk |
| CN113701606B (en) * | 2021-08-31 | 2024-01-30 | 中国航发沈阳黎明航空发动机有限责任公司 | Three-coordinate curved surface compensation detection method for blisk |
| CN114166160A (en) * | 2021-11-03 | 2022-03-11 | 安徽应流航源动力科技有限公司 | Method for detecting multiple blades by using single tool based on three-coordinate measuring machine |
| CN114111685A (en) * | 2021-11-19 | 2022-03-01 | 华能国际电力股份有限公司 | Turbine blade measuring method |
| CN114111685B (en) * | 2021-11-19 | 2023-09-01 | 华能国际电力股份有限公司 | Turbine blade measurement method |
| CN115372412A (en) * | 2022-10-24 | 2022-11-22 | 北京汉飞航空科技有限公司 | Characteristic measurement method for turbine blade based on six-point positioning |
| CN115372412B (en) * | 2022-10-24 | 2023-01-10 | 北京汉飞航空科技有限公司 | Characteristic measurement method for turbine blade based on six-point positioning |
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