CN105651216B - A kind of no positioning reference plane blade parts coordinate system measurement method - Google Patents

A kind of no positioning reference plane blade parts coordinate system measurement method Download PDF

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Publication number
CN105651216B
CN105651216B CN201410627946.0A CN201410627946A CN105651216B CN 105651216 B CN105651216 B CN 105651216B CN 201410627946 A CN201410627946 A CN 201410627946A CN 105651216 B CN105651216 B CN 105651216B
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measurement
coordinate
feature
measurement point
fitted
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CN201410627946.0A
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Chinese (zh)
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CN105651216A (en
Inventor
张露
单纯利
李景尧
王东
周永兆
于绍永
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沈阳黎明航空发动机(集团)有限责任公司
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Abstract

A kind of no positioning reference plane blade parts coordinate system measurement method, using the measurement method without direct positioning datum blade, steps are as follows:1. according to blade profile coordinate data, the MBD models of part are generated using spline surface feature;2. MBD models are imported off line Survey Software, adjustment model coordinate systems direction is consistent with measuring machine coordinate system direction, avoids that virtual gauge head is caused to generate interference with model;3. designing measurement point distribution:Referring to attached drawing 3, ensure measurement point covering measured surface or part length;Not only part requirements had been met but also coincidence measurement economy principle;The measurement method without direct positioning datum part realizes the measurement of special-shaped feature, has played important function to engine running quality stabilization, has improved product quality and detection efficiency, have larger economy and social value.

Description

A kind of no positioning reference plane blade parts coordinate system measurement method

Technical field

The present invention relates to measurement method technical fields, specifically provide a kind of no positioning reference plane blade parts coordinate system Measurement method.

Background technology

There are a kind of common without direct positioning datum part in aero-engine.The characteristics of this kind of part is positioning datum Face is too small or positioning reference plane is unable to measure.For the part that positioning reference plane is too small, when measured profile Distance positioning benchmark compared with When remote, there are deviations for measurement result and actual parts.It can there are add for indirect addressing benchmark surface parts, in general production process Work benchmark, piece test only carry out in process, and final part is without detection.

Aero-engine stator blade (Fig. 1) is exactly a kind of indirect addressing benchmark noodles part, when part cuts off processing base After standard, X-direction and Y-direction positioning reference plane A and B (Fig. 2) can not be measured directly, cause part end-state that can not check and accept production Quality.

People are highly desirable to obtain a kind of excellent no positioning reference plane blade parts coordinate system measurement side of technique effect Method.

Invention content

The object of the present invention is to provide a kind of excellent no positioning reference plane blade parts coordinate systems of technique effect to measure Method.It solves the problems, such as to define technology using MBD models there are detection error and being unable to measure without direct positioning datum class part Each measurement is carried out afterwards by being tested three dimensional type face detection data automatic Fitting part coordinate system with non-geometry feature fitting technique Parameter evaluation.

It is proposed for current piece surface features of shape a kind of based on MBD model holotypes face fitting locating element coordinate system Measurement method.This method carries out offline programming by model, determines part coordinate system, and holotype face departure is calculated and commented again later Valence.Solve the problems, such as no reference plane or the smaller measurement of reference plane based on model measurement technology.The application of off line measuring technique, carries High detection the degree of automation, detects quality and efficiency.

The MBD models are a kind of part expression methods of full three-dimensional feature, are characterized fitting and provide unique theoretical detection Foundation.

The distributing position and quantity that point is determined according to piece surface features of shape make it meet part requirements coincidence measurement again Economy principle;According to MBD model planning survey methods, optimize measuring route;It is fitted by non-geometry feature, utilizes tested type The measurement point and theoretical model in face determine part positioning reference plane by three-dimensional approximating method;

Using no positioning reference plane blade parts coordinate system measurement method, steps are as follows:

1. according to part blade profile coordinate data, the MBD models of part are generated using spline surface feature;

2. MBD models are imported off line Survey Software, adjustment model coordinate systems direction is consistent with measuring machine coordinate system direction, It avoids that virtual gauge head is caused to generate interference with model;

3. designing measurement point distribution:Ensure measurement point covering measured surface or part length;

4. the measurement point by extraction creates characteristic element:Characteristic element is created by 3D approximating methods, is fitted using 3D Method at least needs three measurement elements:(1) measurement point is fitted element on leaf basin;(2) measurement point is fitted element in leading edge;(3) Reference plane measurement point is fitted element;

5. specified best fit type for 3D coordinate systems, selects correct constraint from Optimum Fitting Methods;Constraint can answer For 3D best fit coordinate systems, when measurement data is associated with gross data, coordinate system will pass through rotation in fit procedure Turn constraint and/or translational constraints are changed;It is minimum to reach maximum variation between measurement data and gross data, and constraint is flat Shifting refers to that coordinate system is only rotated and cannot be translated;Constraint rotation refers to that coordinate system is only translated and cannot be rotated.

6. the weighting of feature is set, according to the weight design weighted value of the coordinate system established characteristic element;

The each feature being fitted has weighted value, the weighted value of default value 1, each feature to influence the fitting of final coordinate system As a result, characteristic weighing value is bigger, gained coordinate system result will lay particular stress on and weight big feature;Match each characteristic measurements and theory When, allow to define preferential weighted value, if input feature vector weights are equal, integrates all features;If weighted value etc., Closer to theoretical value based on the big feature of weights.

Each feature will be associated with dimensional tolerance according to it and drawing technology requires to assign weighted value.

7. the process of measurement worked out by measurement point and coordinate system fitting parameter, is realized in machine all automatic measurement.

The basis of the no positioning reference plane blade parts coordinate system measurement method implementation model digital measuring process, It has pushed engine complex structural member Design of digital, manufacture, detection integrated process, will also promote crucial detection technique and inspection Survey efficiency;The measurement for realizing special-shaped feature has played important function to engine running quality stabilization, has improved product quality And detection efficiency, there is larger economy and social value.

Description of the drawings

Below in conjunction with the accompanying drawings and embodiment the present invention is described in further detail:

Fig. 1 is aero-engine stator blade schematic diagram;

Fig. 2 is stator blade positioning reference plane schematic diagram;

Fig. 3 is blade profile measurement point distributed architecture schematic diagram;

Planar survey point schematic diagram on the basis of Fig. 4.

Specific implementation mode

Embodiment 1

Using no positioning reference plane blade parts coordinate system measurement method, steps are as follows:

1. according to part blade profile coordinate data, the MBD models of part are generated using spline surface feature;

2. MBD models are imported off line Survey Software, adjustment model coordinate systems direction is consistent with measuring machine coordinate system direction, It avoids that virtual gauge head is caused to generate interference with model;

3. designing measurement point distribution:Ensure measurement point covering measured surface or part length;

4. the measurement point by extraction creates characteristic element:Characteristic element is created by 3D approximating methods, is fitted using 3D Method at least needs three measurement elements:(1) measurement point is fitted element on leaf basin;(2) measurement point is fitted element in leading edge;(3) Reference plane measurement point is fitted element;

5. specified best fit type for 3D coordinate systems, selects correct constraint from Optimum Fitting Methods;Constraint can answer For 3D best fit coordinate systems, when measurement data is associated with gross data, coordinate system will pass through rotation in fit procedure Turn constraint and/or translational constraints are changed;It is minimum to reach maximum variation between measurement data and gross data, and constraint is flat Shifting refers to that coordinate system is only rotated and cannot be translated;Constraint rotation refers to that coordinate system is only translated and cannot be rotated.

6. the weighting of feature is set, according to the weight design weighted value of the coordinate system established characteristic element;

The each feature being fitted has weighted value, the weighted value of default value 1, each feature to influence the fitting of final coordinate system As a result, characteristic weighing value is bigger, gained coordinate system result will lay particular stress on and weight big feature;Match each characteristic measurements and theory When, allow to define preferential weighted value, if input feature vector weights are equal, integrates all features;If weighted value etc., Closer to theoretical value based on the big feature of weights.

Each feature will be associated with size tolerance requirements according to it and assign weighted value.

7. the process of measurement worked out by measurement point and coordinate system fitting parameter, is realized in machine all automatic measurement.

The basis of the no positioning reference plane blade parts coordinate system measurement method implementation model digital measuring process, It has pushed engine complex structural member Design of digital, manufacture, detection integrated process, will also promote crucial detection technique and inspection Survey efficiency;The measurement for realizing special-shaped feature has played important function to engine running quality stabilization, has improved product quality And detection efficiency, there is larger economy and social value.

Embodiment 2

Steps are as follows for the no positioning reference plane blade parts coordinate system measurement method:

1. according to blade profile coordinate data, the MBD models of part are generated using spline surface feature;

2. MBD models are imported off line Survey Software, adjustment model coordinate systems direction is consistent with measuring machine coordinate system direction, It avoids that virtual gauge head is caused to generate interference with model;

3. designing measurement point distribution:Ensure measurement point covering measured surface or part length;The point arranged using 8 rows 10 It is evenly distributed on blade, leaf basin, blade back, leading edge, trailing edge etc. are all uniformly distributed measurement point, caused by avoiding a certain region leak source The distribution of coordinate fitting deviation is uneven, and reference plane measurement point can be uniformly distributed, and is determined according to tested surface size and measures points.

4. the measurement point by extraction creates characteristic element:3D approximating methods create characteristic element, using 3D approximating methods At least need three measurement elements:(1) measurement point is fitted element on leaf basin;(2) measurement point is fitted element in leading edge;(3) benchmark Planar survey point is fitted element;Referring specifically to attached drawing 4.Series of points should be calculated as characteristic element.Best fit is attempted to search " distance " between the mathematical point of minimum value, i.e. measurement point and extraction is minimum.

5. specified best fit type for 3D coordinate systems, will also select correctly to constrain from Optimum Fitting Methods;Control Rotation and translation of the part in 3 axis.

6. the weighting of feature is set, according to the weight design weighted value of the coordinate system established characteristic element.

The weighting of feature is:Inputting each fit characteristic element has weighted value, weighted value to affect final coordinate system, The weighted value of characteristic element is bigger, and gained coordinate system will be closer to this feature theoretical value.This allows for defining in a coordinate system excellent First element.

7. the process of measurement worked out by measurement point and coordinate system fitting parameter, is realized in machine all automatic measurement.

Claims (1)

1. a kind of no positioning reference plane blade parts coordinate system measurement method, it is characterised in that:The step of measurement method It is as follows:
1. according to part blade profile coordinate data, the MBD models of part are generated using spline surface feature;
2. MBD models are imported off line Survey Software, adjustment model coordinate systems direction is consistent with measuring machine coordinate system direction, avoids Virtual gauge head is caused to generate interference with model;
3. designing measurement point distribution:Ensure measurement point covering measured surface or part length;
4. the measurement point by extraction creates characteristic element:Characteristic element is created by 3D approximating methods, using 3D approximating methods At least need three measurement elements:(1) measurement point is fitted element on leaf basin;(2) measurement point is fitted element in leading edge;(3) benchmark Planar survey point is fitted element;
5. specifying best fit type under 3D coordinate systems, correct constraint is selected from best fit type;When measurement data with When gross data is associated, coordinate system will be changed in fit procedure by rotation condition and/or translational constraints;Reach survey It is minimum to measure maximum variation between data and gross data;
6. the weighting of feature is set, according to the weight design weighted value of the coordinate system established characteristic element;
The each feature being fitted has weighted value, the weighted value of default value 1, each feature to influence final coordinate system fitting knot Fruit, characteristic weighing value is bigger, and gained coordinate system result will lay particular stress on and weight big feature;Match each characteristic measurements and theoretical value When, allow to define preferential weighted value, if input feature vector weights are equal, integrates all features;If weighted value etc., It is fitted based on the big feature of weights;
7. the process of measurement worked out by measurement point and coordinate system fitting parameter, is realized in machine all automatic measurement.
CN201410627946.0A 2014-11-10 2014-11-10 A kind of no positioning reference plane blade parts coordinate system measurement method CN105651216B (en)

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Address after: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6

Patentee after: Chinese Hangfa Shenyang Liming Aero engine limited liability company

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