Receiver assembly quality inspection method and receiver front and rear support point coaxiality calculation method

Abstract

The present invention provides a casing assembly quality inspection method and a casing front and rear fulcrum coaxiality calculation method. The casing assembly quality inspection method comprises: attaching at least three target points to each level of stator casing; measuring the coordinates of all target points in the pretend and formal assembly states; calculating the position and attitude matrix of the formal assembly and pretend state of one level of stator casing; calculating the homogeneous matrix of the relative position and attitude change of the remaining levels of stator casing; comparing the homogeneous matrix with the unit matrix to judge the assembly quality. The casing front and rear fulcrum coaxiality calculation method comprises: obtaining the front and rear fulcrum coaxiality in the pretend state; attaching at least three target points to each of the first level casing and the last level casing; measuring the coordinates of all target points in the pretend and formal assembly states; calculating the position and attitude matrix of the formal assembly and pretend state of the first level casing; calculating the homogeneous matrix of the relative position and attitude change of the last level casing; calculating the front and rear fulcrum coaxiality in the formal assembly state.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft engine assembly, and in particular to a casing assembly quality inspection method and a casing front and rear support point coaxiality calculation method. Background Art

[0002] The rotation state of the high-pressure rotor of an aero-engine is not only determined by the assembly performance of the rotor itself, but also related to the coaxiality of the bearing mounting seat where the high-pressure rotor pivot bearing is located. Therefore, in the field of aero-engine assembly, in order to obtain the coaxiality of the front and rear pivot bearing seats, it is necessary to assemble the stator casing separately without the rotor, which is called engine sham, and measure the coaxiality of the front and rear pivot bearing seats in the sham state. However, in the process of general assembly of the stator casing and the rotor and other parts, that is, the formal assembly process, there is no detection method to detect the coaxiality difference between the formal assembly state and the sham state of the engine and the relative position and posture difference of the stator casings at all levels, so as to obtain the coaxiality of the front and rear pivots in the formal assembly state and check the assembly quality of the stator casing. The commonly used method at present is to perform two stator casing sham and coaxiality measurements, and prove the consistency of the formal assembly and sham states based on the measurement repeatability, but this method cannot reflect the true state of the coaxiality of the front and rear pivots in the formal assembly state and the assembly quality of the stator casing, and lacks effective data input when performing high-pressure rotor rotation state and dynamic analysis. Summary of the invention

[0003] An object of the present invention is to provide a casing assembly quality inspection method, which can inspect the assembly quality of the stator casing from the dual perspectives of position and posture.

[0004] The method for inspecting the quality of casing assembly to achieve the above purpose comprises the following steps: faking stator casings at all levels; attaching at least three target points on each stator casing at each level, wherein any three target points on each stator casing at each level are not collinear; measuring the coordinates of all the target points in the faking state; formally assembling stator casings at all levels; measuring the coordinates of all the target points in the formal assembly state; calculating the position and posture matrix of the formal assembly state and the faking state of the stator casing at one level; calculating the relative position and posture variation homogeneous matrix of the stator casings at the remaining levels under the formal assembly state and the faking state with respect to the stator casing at one level, comprising: when the position and posture matrix is ​​the position and posture matrix of the formal assembly state of the stator casing at one level relative to the faking state, using the position and posture matrix The state matrix converts the coordinates of the target points of the remaining stages of the stator casing in the pretend state into the conversion coordinates in the formal assembly coordinate system, and then uses the conversion coordinates and the coordinates of the target points of the remaining stages of the stator casing in the formal assembly state to calculate the homogeneous matrix of the relative position and attitude change; when the position and attitude matrix is ​​the position and attitude matrix of the pretend state of one of the stator casings relative to the formal assembly state, the position and attitude matrix is ​​used to convert the coordinates of the target points of the stator casing in the remaining stages in the formal assembly state into the conversion coordinates in the pretend coordinate system, and then uses the conversion coordinates and the coordinates of the target points of the stator casing in the pretend state to calculate the homogeneous matrix of the relative position and attitude change; the assembly quality of the formal assembly is judged by comparing the homogeneous matrix with the unit matrix.

[0005] In one or more embodiments of the casing assembly quality inspection method, the stator casings of each stage include a fan casing, a compressor casing, a combustion chamber casing, a high-pressure turbine casing and an interstage casing.

[0006] The casing assembly quality inspection method of the present invention adds target point detection means in the engine pretend state and formal assembly state. According to the changes in the target point coordinates in the two states, the relative position and posture changes of each level of stator casing in the pretend state and the formal assembly state can be accurately obtained, and the assembly quality of the stator casing in the formal assembly state is judged from the dual perspectives of position and posture, and the links that affect the position and posture differences during formal assembly are determined, breaking the limitation of the prior art that the formal assembly quality of the stator casing can only be judged by repetitive measurements, thereby improving the assembly quality of the engine. Only one stator casing pretend and measurement is required, which saves assembly and measurement time, improves assembly efficiency, and can provide effective data input for engine data analysis such as high-pressure rotor rotation state and dynamic analysis.

[0007] Another object of the present invention is to provide a method for calculating the coaxiality of the front and rear fulcrums of a casing, which can accurately obtain the coaxiality of the front and rear fulcrums in the final assembly state.

[0008] The method for calculating the coaxiality of the front and rear fulcrums of a casing to achieve the above purpose comprises the following steps: faking the stator casings of each stage to obtain the coaxiality of the front and rear fulcrums in the faking state; attaching at least three target points on the first stage casing and the last stage casing of each stage of the stator casing, respectively, wherein any three target points on each stage of the stator casing are not collinear; measuring the coordinates of all the target points in the faking state; formally assembling the stator casings of each stage; measuring the coordinates of all the target points in the formal assembly state; calculating the position and posture matrix of the formal assembly state and the faking state of the first stage casing; calculating the relative position and posture change homogeneous matrix of the last stage casing in the formal assembly state and the faking state with the first stage casing, including: when the position and posture matrix is ​​the position and posture matrix of the formal assembly state of the first stage casing relative to the faking state, The position and attitude matrix is ​​used to convert the coordinates of the target point of the last-stage casing in the pretend state into the conversion coordinates in the formal assembly coordinate system, and then the conversion coordinates and the coordinates of the target point of the last-stage casing in the formal assembly state are used to calculate the homogeneous matrix of relative position and attitude changes; when the position and attitude matrix is ​​the position and attitude matrix of the pretend state of the first-stage casing relative to the formal assembly state, the position and attitude matrix is ​​used to convert the coordinates of the target point of the last-stage casing in the formal assembly state into the conversion coordinates in the pretend coordinate system, and then the conversion coordinates and the coordinates of the target point of the last-stage casing in the pretend state are used to calculate the homogeneous matrix of relative position and attitude changes; the homogeneous matrix and the coaxiality of the front and rear fulcrums in the pretend state are used to calculate the coaxiality of the front and rear fulcrums in the formal assembly state.

[0009] In one or more embodiments of the method for calculating the coaxiality of the front and rear fulcrums of the casing, the stator casings of each stage include a fan casing, a compressor casing, a combustion chamber casing, a high-pressure turbine casing and an interstage casing.

[0010] In one or more embodiments of the method for calculating the coaxiality of the front and rear fulcrums of the casing, the first-stage casing is a fan casing, and the last-stage casing is an interstage casing.

[0011] The method for calculating the coaxiality of the front and rear fulcrums of the casing of the present invention adds a means of target point detection in the simulated state and the formal assembly state of the engine. According to the changes in the coordinates of the target points in the two states, the relative position and posture changes of the first-stage casing and the last-stage casing in the simulated state and the formal assembly state can be accurately obtained, and then the final assembly state of the stator casing, that is, the coaxiality of the front and rear fulcrums in the formal assembly state can be calculated, breaking the limitation of the prior art that the coaxiality of the front and rear fulcrums can only be judged by repetitive measurements, improving the assembly quality of the engine, only needing to perform one stator casing simulate and measure, saving assembly and measurement time, improving assembly efficiency, and providing effective data input for engine data analysis such as high-pressure rotor rotation state and dynamic analysis.

[0012] The casing assembly quality inspection method and the casing front and rear fulcrum coaxiality calculation method of the present invention can be used in combination, so as to judge the assembly quality of the stator casing in the formal assembly state from the dual perspectives of position and posture, and accurately obtain the coaxiality of the front and rear fulcrums of the stator casing in the final assembly state, and determine the links that affect the position and posture differences and the coaxiality differences of the front and rear fulcrums during formal assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0014] Figure 1 is a schematic diagram of a stator casing and a target point position according to one or more embodiments.

[0015] Figure 2 It is a flow chart of a casing assembly quality inspection method according to one embodiment.

[0016] Figure 3 It is a flow chart of a casing assembly quality inspection method according to another embodiment.

[0017] Figure 4 It is a flow chart of a method for calculating the coaxiality of front and rear fulcrums of a receiver according to one embodiment.

[0018] Figure 5 It is a flow chart of a method for calculating the coaxiality of front and rear fulcrums of a receiver according to another embodiment. DETAILED DESCRIPTION

[0019] The following discloses a variety of different implementation methods or embodiments of the subject technical solution. To simplify the disclosure, specific examples of each element and arrangement are described below. Of course, these are only examples and are not intended to limit the scope of protection of the present invention. It should be noted that the drawings are only examples, which are not drawn according to the conditions of equal proportions, and should not be used to limit the scope of protection actually required by the present invention. In addition, the transformation methods under different embodiments of the present invention can be appropriately combined.

[0020] Figure 1 A stator casing 100 according to one or more embodiments of the present invention is shown, comprising a multi-stage stator casing including a fan casing 1, a compressor casing 2, a combustion chamber casing 3, a high-pressure turbine casing 4 and an interstage casing 5.

[0021] One embodiment of the casing assembly quality inspection method of the present invention is as follows Figure 2 As shown, the following steps are included:

[0022] 1. Pretend that the stator casings of all levels are without rotors;

[0023] 2. At least three target points are attached to each stage of the stator casing, and any three target points on each stage of the stator casing are not collinear, for example, Figure 1 An example of attaching three target points on each stage stator casing is shown, wherein the target points on the fan casing 1 are 11, 12, and 13, the target points on the compressor casing 2 are 21, 22, and 23, the target points on the combustion chamber casing 3 are 31, 32, and 33, the target points on the high-pressure turbine casing 4 are 41, 42, and 43, and the target points on the interstage casing 5 are 51, 52, and 53;

[0024] 3. Measure the coordinates of all target points in the fake state J P m1～mn For example, a laser tracker, iGPS (indoor GPS, also known as indoor GPS), CCD camera, or other equipment can be used to check the assembly quality of the stator casing in the formal assembly state from the dual perspectives of position and attitude. J P m1～mn Using homogeneous coordinates, the coordinates of each target point of each stage stator casing can be expressed in the form of a matrix: Where m represents the number of each stage of the stator casing, n represents the number of the target point on each stage of the stator casing, and Figure 1 For example, the coordinates of the target points 11 to 13 of the fan casing 1 in the pretend state are Coordinates of target points of compressor casing 2, combustion chamber casing 3, high-pressure turbine casing 4 and interstage casing 5 in the simulated stateJ P 21～23 , J P 31～33 , J P 41～43 , J P 51～53 The same can be said and I will not elaborate on it here;

[0025] 4. The stator casings at all levels and the engine rotor and other parts are assembled, that is, formally assembled;

[0026] 5. Measure the coordinates of all target points in the formal assembly state

[0027] 6. Calculate the position and attitude matrix of the formal assembly state of one of the first-stage stator casings relative to the sham state, that is, the transformation matrix T of the coordinates of each target point of the first-stage stator casing in the sham state to the coordinates in the formal assembly state a =S( B P i1～in , J P i1～in ), T a It can be obtained by the coordinate system conversion algorithm, where i is the number of one of the first-stage stator casings. For example, one of the first-stage stator casings is selected as Figure 1 In the fan case 1 of the embodiment shown, T a =S( B P 11～13 , J P 11～13 );

[0028] 7. Under ideal conditions, the relative position and attitude of each level of stator casing in the sham state are consistent with that in the formal assembly state. Then the position and attitude matrix of the formal assembly state of each level of stator casing relative to the sham state should be T a Therefore, using T a Convert the coordinates of each target point of the remaining stator casings in the dummy state into the conversion coordinates in the formal assembly coordinate system B* P m*1～m*n =T a · J P m*1～m*n , where m * Indicates the numbers of the remaining stator casings except for the aforementioned first-stage stator casing i. For example, if one of the first-stage stator casings i is selected as Figure 1 In the fan case 1 of the embodiment shown in the figure, m * =2, 3, 4 or 5;

[0029] 8. Under the aforementioned ideal conditions, according to the conversion coordinates calculated in the previous step B*P m*1～m*n Should be equal to the coordinates in the formal assembly state B P m*1～m*n However, in the actual assembly process, the relative position and posture between the stator casings at all levels will change in the formal assembly state compared with the fake state. Therefore, according to the conversion coordinates of the target points of the remaining stator casings at all levels, B* P m*1～m*n Coordinates in the formal assembly state B P m*1～m*n , the relative position and attitude change homogeneous matrix ΔT of the remaining stator casings in the formal assembly state and the fake state with respect to the aforementioned stator casing i of one stage can be calculated m* =S( B P m*1～m*n , B* P m*1～m*n );

[0030] 9. The relative position and attitude change of the remaining stator casings are converted into homogeneous matrices ΔT m* Compared with the unit matrix I, the quality of the formal assembly is judged. The closer the two are, the higher the consistency between the formal assembly state and the pretend state of the stator casing of this level. Since only the stator casings of each level are assembled in the pretend state, it is easier to adjust the stator casings of each level to a more ideal state. Therefore, the higher the consistency between the formal assembly state and the pretend state, the better the assembly quality of the formal assembly. If the homogeneous matrix ΔT of the relative position and attitude change of a certain level of stator casing is m* If there is a large difference from the unit matrix I, it is necessary to check the formal assembly of the stator casing of this stage.

[0031] Another embodiment of the casing assembly quality inspection method of the present invention is as follows Figure 3 As shown, the following steps are included:

[0032] 1. Pretend that the stator casings of all levels are without rotors;

[0033] 2. At least three target points are attached to each stage of the stator casing, and any three target points on each stage of the stator casing are not collinear, for example, Figure 1 An example of attaching three target points on each stage stator casing is shown, wherein the target points on the fan casing 1 are 11, 12, and 13, the target points on the compressor casing 2 are 21, 22, and 23, the target points on the combustion chamber casing 3 are 31, 32, and 33, the target points on the high-pressure turbine casing 4 are 41, 42, and 43, and the target points on the interstage casing 5 are 51, 52, and 53;

[0034] 3. Measure the coordinates of all target points in the fake state JP m1～mn For example, a laser tracker, iGPS (indoor GPS, also known as indoor GPS), CCD camera, or other equipment can be used to check the assembly quality of the stator casing in the formal assembly state from the dual perspectives of position and attitude. J P m1～mn Using homogeneous coordinates, the coordinates of each target point of each stage stator casing can be expressed in the form of a matrix: Where m represents the number of each stage of the stator casing, n represents the number of the target point on each stage of the stator casing, and Figure 1 For example, the coordinates of the target points 11 to 13 of the fan casing 1 in the pretend state are Coordinates of target points of compressor casing 2, combustion chamber casing 3, high-pressure turbine casing 4 and interstage casing 5 in the simulated state J P 21～23 , J P 31～33 , J P 41～43 , J P 51～53 The same can be said and I will not elaborate on it here;

[0035] 4. The stator casings at all levels and the engine rotor and other parts are assembled, that is, formally assembled;

[0036] 5. Measure the coordinates of all target points in the formal assembly state

[0037] 6. Calculate the position and attitude matrix of the fake state of one of the first-stage stator casings relative to the formal assembly state, that is, the transformation matrix T of each target point of the first-stage stator casing in the formal assembly state to the coordinates in the fake state b =S( J P i1～in , B P i1～in ), T b It can be obtained by the coordinate system conversion algorithm, where i is the number of one of the first-stage stator casings. For example, one of the first-stage stator casings is selected as Figure 1 In the fan case 1 of the embodiment shown, T b =S( J P 11～13 , B P 11～13 );

[0038] 7. Under ideal conditions, the relative position and posture of each level of stator casing in the sham state are consistent with that in the formal assembly state. Then the position and posture matrix of each level of stator casing in the sham state relative to the formal assembly state should be Tb Therefore, using T b Convert the coordinates of the target points of the remaining stator casings in the formal assembly state into the conversion coordinates in the pseudo coordinate system J* P m*1～m*n =T b · B P m*1～m*n , where m * Indicates the numbers of the remaining stator casings except for the aforementioned first-stage stator casing i. For example, if one of the first-stage stator casings i is selected as Figure 1 In the fan case 1 of the embodiment shown in the figure, m * =2, 3, 4 or 5;

[0039] 8. Under the aforementioned ideal conditions, according to the conversion coordinates calculated in the previous step J* P m*1～m*n Should be equal to the coordinates in the pretend state J P m*1～m*n However, in the actual assembly process, the relative position and posture between the stator casings at all levels will change in the formal assembly state compared with the fake state. Therefore, according to the conversion coordinates of the target points of the remaining stator casings at all levels, J* P m*1～m*n and the coordinates in the fake state J P m*1～m*n , the relative position and attitude change homogeneous matrix ΔT of the remaining stator casings in the formal assembly state and the fake state with respect to the aforementioned stator casing i of one stage can be calculated m* =S( J* P m*1～m*n , J P m*1～m*n );

[0040] 9. The relative position and attitude change of the remaining stator casings are converted into homogeneous matrices ΔT m* Compared with the unit matrix I, the quality of the formal assembly is judged. The closer the two are, the higher the consistency between the formal assembly state and the pretend state of the stator casing of this level. Since only the stator casings of each level are assembled in the pretend state, it is easier to adjust the stator casings of each level to a more ideal state. Therefore, the higher the consistency between the formal assembly state and the pretend state, the better the assembly quality of the formal assembly. If the homogeneous matrix ΔT of the relative position and attitude change of a certain level of stator casing is m* If there is a large difference from the unit matrix I, it is necessary to check the formal assembly of the stator casing of this stage.

[0041] The casing assembly quality inspection method of the present invention adds target point detection means in the engine pretend state and formal assembly state. According to the changes in the target point coordinates in the two states, the relative position and posture changes of each level of stator casing in the pretend state and the formal assembly state can be accurately obtained, and the assembly quality of the stator casing in the formal assembly state is judged from the dual perspectives of position and posture, and the links that affect the position and posture differences during formal assembly are determined, breaking the limitation of the prior art that the formal assembly quality of the stator casing can only be judged by repetitive measurements, thereby improving the assembly quality of the engine. Only one stator casing pretend and measurement is required, which saves assembly and measurement time, improves assembly efficiency, and can provide effective data input for engine data analysis such as high-pressure rotor rotation state and dynamic analysis.

[0042] An embodiment of the method for calculating the coaxiality of the front and rear fulcrums of the casing of the present invention is as follows: Figure 4 As shown, the following steps are included:

[0043] 1. Pretend the stator casings of each level without rotor. The pretend process can be carried out on a precision turntable. The precision turntable is used to measure the runout data of the bearing seat (front fulcrum) benchmark of the first-stage casing and the bearing seat (rear fulcrum) benchmark of the last-stage casing in each level of the stator casing relative to the turntable coordinate system. The coaxiality or concentricity of the rear fulcrum relative to the front fulcrum in the pretend state is obtained by using the fitting algorithm and coordinate transformation. J D, the coaxiality of the front and rear fulcrums in the fake state can be obtained through the calculation and conversion function of the precision turntable. J D, in order to reflect the change of the coaxiality of the front and rear fulcrums in the fake state and the formal assembly state from the dual perspectives of position and posture, J D is expressed in the form of homogeneous coordinates;

[0044] 2. At least three target points are attached to the first stage casing and the last stage casing respectively, where any three target points on each stage stator casing are not collinear. For example, Figure 1 In the example of the stator casing 100 shown, the first-stage casing is a fan casing 1, which is affixed with three target points 11, 12, and 13, and the last-stage casing is an interstage casing 5, which is affixed with three target points 51, 52, and 53;

[0045] 3. Measure the coordinates of all target points in the fake state J P m1～mn For example, a laser tracker, iGPS (indoor GPS, also known as indoor GPS), CCD camera, or other equipment can be used to reflect the coaxiality changes of the front and rear fulcrums in the fake state and the formal assembly state from the dual perspectives of position and posture. J P m1～mnUsing homogeneous coordinates, the coordinates of each target point of each stage stator casing can be expressed in the form of a matrix: Where m represents the number of the first stage casing or the last stage casing, and n represents the number of the target point on each stage stator casing. Figure 1 For example, the first stage casing is the fan casing 1, and the coordinates of each target point 11 to 13 in the pretend state are The last stage casing is the interstage casing 5, and the coordinates of its target points 51-53 in the dummy state are

[0046] 4. The stator casings at all levels and the engine rotor and other parts are assembled, that is, formally assembled;

[0047] 5. Measure the coordinates of all target points in the formal assembly state

[0048] 6. Calculate the position and posture matrix of the formal assembly state of the first-stage casing relative to the pretend state, that is, the transformation matrix T of the coordinates of each target point of the first-stage casing in the pretend state to the coordinates in the formal assembly state a =S( B P 11～1n , J P 11～1n ), T a It can be obtained by coordinate system conversion algorithm, for example Figure 1 In the example of the stator casing 100 shown, the first stage casing is a fan casing 1, T a =S( B P 11～13 , J P 11～13 );

[0049] 7. Under ideal conditions, the relative position and posture of the first-stage casing and the last-stage casing in the sham state are consistent with those in the formal assembly state. Then the position and posture matrices of the formal assembly state of the first-stage casing and the last-stage casing relative to the sham state should be T a Therefore, using T a Convert the coordinates of each target point of the last stage casing in the fake state into the conversion coordinates in the formal assembly coordinate system B* P j1～jn =T a · J P j1～jn , where j represents the number of the last stage casing, for example Figure 1 In the example of the stator casing 100 shown, the last stage casing is the interstage casing 5, using T a Convert the coordinates of each target point in the fake state into B* P51～53 =T a · J P 51～53 ;

[0050] 8. Under the aforementioned ideal conditions, according to the conversion coordinates calculated in the previous step B* P j1～jn Should be equal to the coordinates in the formal assembly state B P j1～jn However, in the actual assembly process, the relative position and posture of the first-stage casing and the last-stage casing in the formal assembly state and the fake state will change to a certain extent. Therefore, according to the conversion coordinates of each target point of the last-stage casing B* P j1～jn Coordinates in the formal assembly state B P j1～jn , the relative position and attitude change matrix ΔT of the last stage casing in the formal assembly state and the fake state with the first stage casing can be calculated j =S( B P j1～jn , B* P j1～jn );

[0051] 9. Using the aforementioned homogeneous matrix ΔT j The coaxiality of the front and rear pivots in the fake state can be calculated by the coaxiality JD of the front and rear pivots in the formal assembly state. B D=ΔT j · J D.

[0052] Another embodiment of the method for calculating the coaxiality of the front and rear fulcrums of the casing of the present invention is as follows Figure 5 As shown, the following steps are included:

[0053] 1. Pretend the stator casings of each level without rotor. The pretend process can be carried out on a precision turntable. The precision turntable is used to measure the runout data of the bearing seat (front fulcrum) benchmark of the first-stage casing and the bearing seat (rear fulcrum) benchmark of the last-stage casing in each level of the stator casing relative to the turntable coordinate system. The coaxiality or concentricity of the rear fulcrum relative to the front fulcrum in the pretend state is obtained by using the fitting algorithm and coordinate transformation. J D, the coaxiality of the front and rear fulcrums in the fake state can be obtained through the calculation and conversion function of the precision turntable. J D, in order to reflect the change of the coaxiality of the front and rear fulcrums in the fake state and the formal assembly state from the dual perspectives of position and posture, J D is expressed in the form of homogeneous coordinates;

[0054] 2. At least three target points are attached to the first stage casing and the last stage casing respectively, where any three target points on each stage stator casing are not collinear. For example, Figure 1 In the example of the stator casing 100 shown, the first-stage casing is a fan casing 1, which is affixed with three target points 11, 12, and 13, and the last-stage casing is an interstage casing 5, which is affixed with three target points 51, 52, and 53;

[0055] 3. Measure the coordinates of all target points in the fake state J P m1～mn For example, a laser tracker, iGPS (indoor GPS, also known as indoor GPS), CCD camera, or other equipment can be used to reflect the coaxiality changes of the front and rear fulcrums in the fake state and the formal assembly state from the dual perspectives of position and posture. J P m1～mn Using homogeneous coordinates, the coordinates of each target point of each stage stator casing can be expressed in the form of a matrix: Where m represents the number of the first stage casing or the last stage casing, and n represents the number of the target point on each stage stator casing. Figure 1 For example, the first stage casing is the fan casing 1, and the coordinates of each target point 11 to 13 in the pretend state are The last stage casing is the interstage casing 5, and the coordinates of its target points 51-53 in the dummy state are

[0056] 4. The stator casings at all levels and the engine rotor and other parts are assembled, that is, formally assembled;

[0057] 5. Measure the coordinates of all target points in the formal assembly state

[0058] 6. Calculate the position and attitude matrix of the first-stage casing's fake state relative to the formal assembly state, that is, the transformation matrix T of each target point of the first-stage casing in the formal assembly state to the coordinates in the fake state b =S( J P 11～1n , B P 11～1n ), T b It can be obtained by coordinate system conversion algorithm, for example Figure 1 In the example of the stator casing 100 shown, the first stage casing is a fan casing 1, T b =S( J P 11～13 , B P 11～13 );

[0059] 7. Under ideal conditions, the relative position and posture of the first-stage casing and the last-stage casing in the sham state are consistent with those in the formal assembly state. Then the position and posture matrices of the formal assembly state of the first-stage casing and the last-stage casing relative to the sham state should be T b Therefore, using T b Convert the coordinates of each target point of the last stage casing in the formal assembly state into the conversion coordinates in the pseudo coordinate system J* P j1～jn =T b · B P j1～jn , where j represents the number of the last stage casing, for example Figure 1 In the example of the stator casing 100 shown, the last stage casing is the interstage casing 5, using T b The coordinates of each target point in the formal assembly state are converted into J* P 51～53 =T b · B P 51～53 ;

[0060] 8. Under the aforementioned ideal conditions, according to the conversion coordinates calculated in the previous step J* P j1～jn Should be equal to the coordinates in the pretend state J P j1～jn However, in the actual assembly process, the relative position and posture of the first-stage casing and the last-stage casing in the formal assembly state and the fake state will change to a certain extent. Therefore, according to the conversion coordinates of each target point of the last-stage casing J* P j1～jn and the coordinates in the fake state J P j1～jn , the relative position and attitude change matrix ΔT of the last stage casing in the formal assembly state and the fake state with the first stage casing can be calculated j =S( J* P j1～jn , J P j1～jn );

[0061] 9. Using the aforementioned homogeneous matrix ΔT j Coaxiality with the front and rear pivots in the fake state J D, which can calculate the coaxiality of the front and rear fulcrums in the formal assembly state B D=ΔT j · J D.

[0062] The method for calculating the coaxiality of the front and rear fulcrums of the casing of the present invention adds a means of target point detection in the simulated state and the formal assembly state of the engine. According to the changes in the coordinates of the target points in the two states, the relative position and posture changes of the first-stage casing and the last-stage casing in the simulated state and the formal assembly state can be accurately obtained, and then the final assembly state of the stator casing, that is, the coaxiality of the front and rear fulcrums in the formal assembly state can be calculated, breaking the limitation of the prior art that the coaxiality of the front and rear fulcrums can only be judged by repetitive measurements, improving the assembly quality of the engine, only needing to perform one stator casing simulate and measure, saving assembly and measurement time, improving assembly efficiency, and providing effective data input for engine data analysis such as high-pressure rotor rotation state and dynamic analysis.

[0063] The casing assembly quality inspection method and the casing front and rear fulcrum coaxiality calculation method of the present invention can be used in combination, so as to judge the assembly quality of the stator casing in the formal assembly state from the dual perspectives of position and posture, and accurately obtain the coaxiality of the front and rear fulcrums of the stator casing in the final assembly state, and determine the links that affect the position and posture differences and the coaxiality differences of the front and rear fulcrums during formal assembly.

[0064] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for inspecting the quality of casing assembly, characterized in that: The following steps are involved: Disguise the stator casings at all levels; At least three target points are respectively attached to the stator casing of each stage, wherein any three target points on the stator casing of each stage are not collinear; measuring the coordinates of all the target points in the fake state; The stator casings of each level are formally assembled; measuring the coordinates of all the target points in the formal assembly state; Calculating the position and attitude matrix of the formal assembly state and the pretend state of the stator casing of one stage; Calculating the relative position and attitude change homogeneous matrix of the stator casings of the remaining stages in the formal assembly state and the pretend state with respect to the one-stage stator casing, including: When the position and attitude matrix is ​​the position and attitude matrix of the formal assembly state of one of the first-stage stator casings relative to the pretend state, the coordinates of the target points of the remaining stages of the stator casings in the pretend state are converted into conversion coordinates in the formal assembly coordinate system by using the position and attitude matrix, and then the relative position and attitude change amount homogeneous matrix is ​​calculated by using the conversion coordinates and the coordinates of the target points of the remaining stages of the stator casings in the formal assembly state; When the position and attitude matrix is ​​the position and attitude matrix of the pretended state of one of the first-stage stator casings relative to the formal assembly state, the coordinates of the target points of the remaining stages of the stator casings in the formal assembly state are converted into conversion coordinates in a pretended coordinate system by using the position and attitude matrix, and then the relative position and attitude change amount homogeneous matrix is ​​calculated by using the conversion coordinates and the coordinates of the target points of the remaining stages of the stator casings in the pretended state; The assembly quality of the formal assembly is determined by comparing the homogeneous matrix with the identity matrix.

2. The casing assembly quality inspection method according to claim 1, characterized in that: The stator casings of each stage include a fan casing, a compressor casing, a combustion chamber casing, a high-pressure turbine casing and an interstage casing.

3. The method for calculating the coaxiality of the front and rear support points of the casing is characterized by: The following steps are involved: The stator casings of each level are simulated to obtain the coaxiality of the front and rear pivots under simulated state; At least three target points are respectively attached to the first stage casing and the last stage casing of each stage of the stator casing, wherein any three target points on each stage of the stator casing are not collinear; measuring the coordinates of all the target points in the fake state; The stator casings of each level are formally assembled; measuring the coordinates of all the target points in the formal assembly state; Calculating the position and posture matrix of the formal assembly state and the pretend state of the first-stage casing; Calculating the relative position and attitude change homogeneous matrix of the last stage casing in the formal assembly state and the pretend state with the first stage casing, including: When the position and attitude matrix is ​​the position and attitude matrix of the formal assembly state of the first-stage casing relative to the pretend state, the coordinates of the target point of the last-stage casing in the pretend state are converted into conversion coordinates in the formal assembly coordinate system by using the position and attitude matrix, and then the relative position and attitude change amount homogeneous matrix is ​​calculated by using the conversion coordinates and the coordinates of the target point of the last-stage casing in the formal assembly state; When the position and attitude matrix is ​​the position and attitude matrix of the pretended state of the first-stage casing relative to the formal assembly state, the coordinates of the target point of the last-stage casing in the formal assembly state are converted into conversion coordinates in a pretended coordinate system by using the position and attitude matrix, and then the relative position and attitude change amount homogeneous matrix is ​​calculated by using the conversion coordinates and the coordinates of the target point of the last-stage casing in the pretended state; The coaxiality of the front and rear fulcrums in the formal assembly state is calculated by using the homogeneous matrix and the coaxiality of the front and rear fulcrums in the pretend state.

4. The method for calculating the coaxiality of the front and rear fulcrums of the casing according to claim 3, characterized in that: The stator casings of each stage include a fan casing, a compressor casing, a combustion chamber casing, a high-pressure turbine casing and an interstage casing.

5. The method for calculating the coaxiality of the front and rear fulcrums of the casing according to claim 4, characterized in that: The first-stage casing is a fan casing, and the last-stage casing is an interstage casing.

Images