CN109933896B - Automatic positioning method for multistage compressor wheel disc - Google Patents
Automatic positioning method for multistage compressor wheel disc Download PDFInfo
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Abstract
The invention discloses an automatic positioning method for a multistage compressor wheel disc, which is used for solving the technical problem of low efficiency of the conventional multistage compressor wheel disc positioning method. Firstly, extracting coordinates of positioning key points on upper and lower positioning surfaces of each stage of wheel disc, automatically calculating a horizontal and vertical coordinate difference value between the positioning key points on the upper positioning surface of the upper-stage wheel disc and the positioning key points on the upper positioning surface of the lower-stage wheel disc, and adding the difference value to the coordinates of the positioning points of the lower-stage wheel disc to obtain a correct position of the lower-stage wheel disc; and deleting the original wheel disc at the stage, and guiding the correct position of the wheel disc at the stage to realize the positioning of the multi-stage wheel disc. By the method, the positioning of the wheel disc of the multistage compressor is completed within a few seconds, and the positioning efficiency of the wheel disc of the multistage compressor is improved.
Description
Technical Field
The invention relates to a multistage compressor wheel disc positioning method, in particular to an automatic multistage compressor wheel disc positioning method.
Background
The compressor is an important component of an aircraft gas turbine engine and is used for compressing air flowing through the aircraft engine to provide a larger thrust effect for the engine.
The document 'optimization analysis of rotor structure strength of a combined compressor, Nanjing aerospace university, 2013' discloses a multistage compressor wheel disc positioning method. According to the method, three-dimensional parameterized models of three-level axial flow and one-level centrifugal compressor rotor structures are established according to positions of wheel discs of all levels, and then a UG assembly module is utilized, and the three-dimensional parameterized model of the combined compressor rotor structure is established by adopting contact alignment and concentric assembly constraint at each level of connection parts. According to the method, the positions of the wheel discs of the compressor at all stages need to be obtained in advance, and the preparation work at the early stage of modeling is complicated, so that the positioning efficiency of the wheel discs of the compressor at all stages is low.
Disclosure of Invention
In order to overcome the defect of low efficiency of the conventional multistage compressor wheel disc positioning method, the invention provides an automatic multistage compressor wheel disc positioning method. Firstly, extracting coordinates of positioning key points on upper and lower positioning surfaces of each level of wheel disc, automatically calculating a horizontal and vertical coordinate difference value between the positioning key points on the upper positioning surface of the upper level of wheel disc and the positioning key points on the upper positioning surface of the level of wheel disc, and adding the difference value to the coordinates of the positioning points of the lower level of wheel disc to obtain a correct position of the level of wheel disc; and deleting the original wheel disc at the stage, and guiding the correct position of the wheel disc at the stage to realize the positioning of the multi-stage wheel disc. By the method, the positioning of the wheel disc of the multistage compressor is completed within a few seconds, and the positioning efficiency of the wheel disc of the multistage compressor is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows: an automatic positioning method for a multistage compressor wheel disc is characterized by comprising the following steps:
the method comprises the following steps of firstly, dividing the compressor wheel disc into four types of drum drums with equal bands on two sides, drum drums with only left side bands, drum drums with only right side bands and drum drums with no band on two sides according to the difference of the geometric shapes of the compressor wheel disc. And finishing the establishment of each compressor wheel disc model. During modeling, the maximum number of the existing key points is recorded as KMAX, and KMAX +1 is used as the first key point number of the wheel disc when the wheel disc key points are established. The lower right corner of the hub of the compressor wheel disc is selected as a positioning point 1, parameters of the compressor wheel disc are started by g% i%, linkage of all sizes is realized on the basis of ensuring that a model is not distorted, and modeling of a compressor wheel disc model base is completed.
Wherein KMAX-the existing key point maximum number, KMAX + 1-the first key point number of the wheel disk at the level, and g% i% -the beginning of the wheel disk parameter name.
And step two, the contact surface of the wheel disc and the wheel disc at the higher level is an upper positioning surface, and the contact surface of the wheel disc and the wheel disc at the lower level is a lower positioning surface. The method comprises the following steps of naming a position key point A of a lower positioning surface of the wheel disc in a control Y direction as KMAX +100, and naming a position key point B of a lower positioning surface of the wheel disc in a control X direction as KMAX + 101; and a positioning surface control Y direction positioning key point C on the wheel disc is named as KMAX +200, and a positioning surface control X direction positioning key point D under the wheel disc is named as KMAX + 201.
And step three, automatically calculating the coordinate difference of the positioning key points.
Calculating to obtain the coordinate difference values of the upper-level wheel disc and the lower-level wheel disc in the Y direction and the X direction:
DY＝UY(A)-UY(C) (1)
DX＝UX(B)-UX(D) (2)
in the formula, UY (A) -the lower positioning surface of the upper-level wheel disc controls the longitudinal coordinate of a positioning key point in the Y direction, UY (C) -the upper positioning surface of the level wheel disc controls the longitudinal coordinate of the positioning key point in the Y direction, DY-the coordinate difference value of the upper-level wheel disc and the lower-level wheel disc in the Y direction, UX (B) -the lower positioning surface of the upper-level wheel disc controls the transverse coordinate of the positioning key point in the X direction, UX (D) -the upper positioning surface of the level wheel disc controls the transverse coordinate of the positioning key point in the X direction, and DX-the coordinate difference value of the upper-level wheel disc and the lower-level wheel disc in the X direction.
And fourthly, adding a coordinate difference DX in the X direction to the abscissa of the positioning point 1 of the lower-level wheel disc, and adding a coordinate difference DY in the Y direction to the ordinate of the positioning point 1 to obtain a correct new position of the lower-level wheel disc.
In the text, the coordinate difference value of the DX-upper wheel disc and the DX-lower wheel disc in the X direction and the coordinate difference value of the DY-upper wheel disc and the DX-lower wheel disc in the Y direction.
And fifthly, deleting the original lower-level wheel disc, and importing a new lower-level wheel disc file to realize the automatic positioning of the multi-level wheel disc.
The invention has the beneficial effects that: firstly, extracting coordinates of positioning key points on upper and lower positioning surfaces of each level of wheel disc, automatically calculating a horizontal and vertical coordinate difference value between the positioning key points on the upper positioning surface of the upper level of wheel disc and the positioning key points on the upper positioning surface of the level of wheel disc, and adding the difference value to the coordinates of the positioning points of the lower level of wheel disc to obtain a correct position of the level of wheel disc; and deleting the original wheel disc at the stage, and guiding the correct position of the wheel disc at the stage to realize the positioning of the multi-stage wheel disc. By the method, the positioning of the wheel disc of the multistage compressor is completed within a few seconds, and the positioning efficiency of the wheel disc of the multistage compressor is improved.
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic diagram of a compressor wheel disc with drum barrels on both sides in the automatic positioning method of the multistage compressor wheel disc of the invention.
Fig. 2 is a schematic view of a compressor disk without a drum on both sides in the automatic positioning method of a multistage compressor disk according to the present invention.
In the figure, 1-positioning point, A-positioning surface under the wheel disc controls the key point of Y-direction positioning, B-positioning surface under the wheel disc controls the key point of X-direction positioning, C-positioning surface on the wheel disc controls the key point of Y-direction positioning, and D-positioning surface under the wheel disc controls the key point of X-direction positioning.
Detailed Description
Reference is made to fig. 1-2. The automatic positioning method of the multistage compressor wheel disc comprises the following specific steps:
step one, establishing a compressor wheel disc model base.
According to the difference of the geometric shape of the compressor wheel disc, the compressor wheel disc is divided into four types of drum cylinders with equal bands on two sides, only drum cylinders with a left side, only drum cylinders with a right side and no drum cylinders on two sides. And establishing a model of each compressor wheel disc by adopting an ANSYS Parametric Design Languge. During modeling, the maximum number of the existing key points is recorded as KMAX, and KMAX +1 is used as the first key point number of the wheel disc when the wheel disc key points are established. The lower right corner of the hub of the compressor wheel disc is selected as a positioning point 1, parameters of the compressor wheel disc start at g% i%, linkage of all sizes is achieved on the basis of ensuring that a model is not distorted, and modeling is completed.
Herein KMAX-maximum number of existing keypoints, KMAX + 1-first keypoint number of the wheel at this level, g% i% -beginning of wheel parameter name.
And step two, selecting and extracting the positioning key points.
The contact surface of the wheel disc and the wheel disc at the upper level is an upper positioning surface, and the contact surface of the wheel disc and the wheel disc at the lower level is a lower positioning surface. The method comprises the following steps of naming a position key point A of a lower positioning surface of the wheel disc in a control Y direction as KMAX +100, and naming a position key point B of a lower positioning surface of the wheel disc in a control X direction as KMAX + 101; and a positioning surface control Y direction positioning key point C on the wheel disc is named as KMAX +200, and a positioning surface control X direction positioning key point D under the wheel disc is named as KMAX + 201.
And step three, automatically calculating the coordinate difference of the positioning key points.
Automatically calculating to obtain the coordinate difference values of the upper-level wheel disc and the lower-level wheel disc in the Y direction and the X direction:
DY＝UY(A)-UY(C) (1)
DX＝UX(B)-UX(D) (2)
in the formula, UY (A) -the lower positioning surface of the upper-level wheel disc controls the longitudinal coordinate of a positioning key point in the Y direction, UY (C) -the upper positioning surface of the level wheel disc controls the longitudinal coordinate of the positioning key point in the Y direction, DY-the coordinate difference value of the upper-level wheel disc and the lower-level wheel disc in the Y direction, UX (B) -the lower positioning surface of the upper-level wheel disc controls the transverse coordinate of the positioning key point in the X direction, UX (D) -the upper positioning surface of the level wheel disc controls the transverse coordinate of the positioning key point in the X direction, and DX-the coordinate difference value of the upper-level wheel disc and the lower-level wheel disc in the X direction.
And step four, determining the correct position of the stage of the compressor wheel disc.
And adding a coordinate difference DX in the X direction to the abscissa of the positioning point 1 of the lower-level wheel disc, and adding a coordinate difference DY in the Y direction to the ordinate of the positioning point 1 of the lower-level wheel disc to obtain a correct new position of the lower-level wheel disc.
In the text, the coordinate difference value of the DX-upper wheel disc and the DX-lower wheel disc in the X direction and the coordinate difference value of the DY-upper wheel disc and the DX-lower wheel disc in the Y direction.
And step five, realizing automatic positioning.
And deleting the original lower-level wheel disc, and importing a new lower-level wheel disc file to realize the automatic positioning of the multi-level wheel disc.
Claims (1)
1. An automatic positioning method for a multistage compressor wheel disc is characterized by comprising the following steps:
the method comprises the following steps that firstly, according to the difference of the geometric shapes of the compressor wheel disc, the compressor wheel disc is divided into four types of drum drums with equal bands on two sides, drum drums with only left sides, drum drums with only right sides and drum drums without both sides; completing the establishment of each compressor wheel disc model; during modeling, recording the existing maximum number of the key points as KMAX, and taking KMAX +1 as the first key point number of the wheel disc when the key points of the wheel disc are established; selecting the lower right corner of the hub of the compressor wheel disc as a positioning point 1, starting parameters of the compressor wheel disc by g% i%, realizing linkage of various sizes on the basis of ensuring that a model is not distorted, and completing modeling of a compressor wheel disc model library;
wherein KMAX-the existing key point maximum number, KMAX + 1-the first key point number of the wheel disc at the level, and g% i% -the beginning of the wheel disc parameter name;
secondly, the contact surface of the wheel disc and the upper wheel disc is an upper positioning surface, and the contact surface of the wheel disc and the lower wheel disc is a lower positioning surface; the method comprises the following steps of naming a position key point A of a lower positioning surface of the wheel disc in a control Y direction as KMAX +100, and naming a position key point B of a lower positioning surface of the wheel disc in a control X direction as KMAX + 101; the method comprises the following steps of naming a positioning key point C point of a positioning surface on the wheel disc in a Y direction as KMAX +200, and naming a positioning key point D point of a positioning surface under the wheel disc in an X direction as KMAX + 201;
step three, automatically calculating the coordinate difference of the positioning key points;
calculating to obtain the coordinate difference values of the upper-level wheel disc and the lower-level wheel disc in the Y direction and the X direction:
DY＝UY(A)-UY(C) (1)
DX＝UX(B)-UX(D) (2)
in the formula, UY (A) -the lower positioning surface of the upper-level wheel disc controls the longitudinal coordinate of a positioning key point in the Y direction, UY (C) -the upper positioning surface of the level wheel disc controls the longitudinal coordinate of the positioning key point in the Y direction, DY-the coordinate difference value of the upper-level wheel disc and the lower-level wheel disc in the Y direction, UX (B) -the lower positioning surface of the upper-level wheel disc controls the transverse coordinate of the positioning key point in the X direction, UX (D) -the upper positioning surface of the level wheel disc controls the transverse coordinate of the positioning key point in the X direction, and DX-the coordinate difference value of the upper-level wheel disc and the lower-level wheel disc in the X direction;
adding a coordinate difference DX in the X direction to the abscissa of a positioning point 1 of the lower-level wheel disc, and adding a coordinate difference DY in the Y direction to the ordinate of the positioning point 1 to obtain a correct new position of the lower-level wheel disc;
in the text, the coordinate difference value of the DX-upper wheel disc and the lower wheel disc in the X direction, and the coordinate difference value of the DY-upper wheel disc and the lower wheel disc in the Y direction;
and fifthly, deleting the original lower-level wheel disc, and importing a new lower-level wheel disc file to realize the automatic positioning of the multi-level wheel disc.
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