Accurate shaping method for special-shaped matching surface rotary assembly body

Abstract

The invention discloses a precise shaping method for a special-shaped matching surface rotary assembly, which comprises the following steps of: reconstructing a stator assembly structure of a stator matching surface based on scanning point cloud of the stator matching surface, calculating a first cylindrical coordinate of the scanning point cloud of the stator matching surface in a stator reference coordinate system, and extracting an actually measured outer contour of a stator rotating body by utilizing the first cylindrical coordinate; the actually-measured outer contour of the stator rotating body is extrapolated according to the assembly clearance to form an ideal outer contour of the rotor rotating body; reconstructing a rotor assembly structure of the rotor matching surface based on the scanning point cloud of the rotor matching surface, performing virtual assembly on the stator assembly structure and the rotor assembly structure, and calculating a second cylindrical coordinate of the scanning point cloud of the rotor matching surface in a stator reference coordinate system; the trimming amount of the ideal outer contour of the virtually-assembled rotor rotating body and the rotor matching surface at the corresponding point is calculated; the problem that the assembly clearance of the special-shaped matching surface rotary assembly body is out of tolerance can be solved.

Description

Technical Field

[0001] This invention belongs to the technical field of irregular surface assembly, and specifically relates to a precise shaping method for an irregular mating surface rotating assembly. Background Technology

[0002] Besides the typical cylindrical mating surfaces, rotating assemblies also have irregularly shaped elliptical and non-standard curved mating surfaces, typically designed to meet specific kinematic or mechanical performance requirements. Using standard geometries would fail to achieve the desired results. However, using irregularly shaped mating surfaces not only increases design complexity but also significantly increases machining and inspection difficulties. This often leads to out-of-tolerance clearances in the rotating assembly's mating surfaces, resulting in noise and runout issues during operation. When machining rotor mating surfaces, if the morphology of the stator mating surfaces can be inspected and the rotor mating surfaces modified to suit the full rotational mating state of the rotor and stator, the rotational clearances can be improved, enhancing operational performance.

[0003] In the prior art, for example, in the patent application with application number "202418000432.7" entitled "A method for predicting the clearance of the control surface based on three-dimensional scanning", when using the three-dimensional point cloud computing of the control surface sealing plate and the fuselage mating section to calculate the control surface clearance, only the clearance calculation method under a single control surface state is considered, and the minimum clearance under the full rotation state of the control surface is not considered.

[0004] For example, in patent application number "202410608217.4" entitled "A Canopy Coordination Method Based on Virtual Assembly Using Point Cloud Measured Data," the skin adjustment amount is calculated under deterministic assembly conditions using measured point clouds of the canopy and fuselage. However, for rotating bodies, the assembly state between the rotor and stator depends on the rotation angle. Different rotation angles result in different clearance fits, making it impossible to evaluate motion clearance using a fixed assembly state.

[0005] Therefore, in view of the problem that the existing technology cannot adjust the assembly gap of the stator mechanism and the rotor mechanism with relative motion and irregular surface matching, resulting in the assembly gap exceeding the tolerance, the present invention discloses a precise shaping method for rotating assemblies with irregular mating surfaces. Summary of the Invention

[0006] This invention discloses a precise shaping method for rotating assemblies with irregular mating surfaces, which can solve the problem of excessive assembly clearance in rotating assemblies with irregular mating surfaces.

[0007] This invention is achieved through the following technical solution:

[0008] A precise shaping method for a rotating assembly with irregular mating surfaces is proposed. The method involves reconstructing the stator assembly structure based on the scanned point cloud of the stator mating surfaces, calculating the first cylindrical coordinates of the scanned point cloud in the stator reference coordinate system, extracting the measured outer contour of the rotating stator using the first cylindrical coordinates, and extrapolating the measured outer contour of the rotating stator according to the assembly gap to form the ideal outer contour of the rotating rotor. The method also involves reconstructing the rotor assembly structure based on the scanned point cloud of the rotor mating surfaces, virtually assembling the stator assembly structure and the rotor assembly structure, calculating the second cylindrical coordinates of the scanned point cloud of the rotor mating surfaces in the stator reference coordinate system, and calculating the adjustment amount between the ideal outer contour of the virtually assembled rotating rotor and the rotor mating surfaces at corresponding points.

[0009] To better realize the present invention, the following steps are further included:

[0010] Step 1: Use a 3D scanning device to obtain the scanning point cloud of the stator mating surface and the rotor mating surface;

[0011] Step 2: Reconstruct the stator assembly structure of the stator mating surface based on the scanned point cloud of the stator mating surface, and establish a stator reference coordinate system on the stator assembly structure. Calculate the first cylinder coordinates of the scanned point cloud of the stator mating surface in the stator reference coordinate system.

[0012] Step 3: Extract the measured outer contour of the stator rotating body based on the first cylindrical coordinate, calculate the normal vector of each point on the measured outer contour of the stator rotating body, and generate the ideal outer contour of the rotor rotating body in the direction of the normal vector with the assembly gap.

[0013] Step 4: Reconstruct the rotor assembly structure of the rotor mating surfaces based on the scanned point cloud of the rotor mating surfaces, and establish a rotor reference coordinate system on the rotor assembly structure. Based on the ideal pose relationship between the stator reference coordinate system and the rotor reference coordinate system, perform virtual assembly of the stator assembly structure and the rotor assembly structure;

[0014] Step 5: Calculate the second cylindrical coordinates of the scanned point cloud of the rotor mating surface in the stator reference coordinate system;

[0015] Step 6: Calculate the adjustment amount at corresponding points between the ideal outer contour coordinates of the rotor rotating body after virtual assembly and the second cylindrical coordinates of the rotor mating surface.

[0016] To better realize the present invention, step 2 further includes:

[0017] Step 2.1: Establish the stator reference coordinate system and calculate the vector coordinates of each point on the stator mating surface in the stator reference coordinate system:

[0018]

[0019] Where: P TmThis represents the 4×1 position vector of each point on the stator mating surface in the stator reference coordinate system; P represents the inverse matrix of the stator reference coordinate system; m This represents the 4×1 position vector of each point on the stator mating surface in the global coordinate system;

[0020] Step 2.2: Calculate the first cylindrical coordinates of the scanned point cloud of the stator mating surface in the stator reference coordinate system based on vector coordinates:

[0021]

[0022] Where: P Tm ·x、P Tm ·y、P Tm ·z represents the X, Y, and Z coordinates of the scanned point cloud of the stator mating surface in the stator reference coordinate system; ρ m θ m z m These represent the polar radius, polar angle, and height of the scanned point cloud of the stator mating surface in the stator reference coordinate system, respectively.

[0023] To better realize the present invention, step 3 further includes:

[0024] Step 3.1: Extract the measured outer contour of the stator rotating body using the polar radius and height of each point on the stator mating surface:

[0025]

[0026] Where: h m ·a represents the x-coordinate of each point on the measured outer contour of the stator rotating body; h m ·b represents the ordinate of each point on the measured outer contour of the stator rotating body; i represents the i-th point on the measured outer contour of the stator rotating body; Ω i Let represent the set of contour lines on the i-th mating surface of the stator, consisting of all points with the same polar radius;

[0027] Step 3.2: Calculate the normal vectors at each point on the measured outer contour of the stator rotating body. Generate the ideal outer contour of the rotor rotating body along the assembly gap in the direction of the normal vectors:

[0028]

[0029] in: These represent the abscissa and ordinate of each point on the ideal outer contour of the rotor rotating body, respectively; v m a、v m .b represents the abscissa and ordinate of the normal vector of each point on the measured outer contour of the stator rotating body, respectively; δ represents the assembly clearance.

[0030] To better realize the present invention, step 4 further includes:

[0031] Step 4.1: Establish the rotor reference coordinate system and calculate the coordinates of each point on the rotor mating surface in the rotor reference coordinate system:

[0032]

[0033] Where: P Tn This represents the 4×1 position vector of each point on the rotor mating surface in the rotor reference coordinate system; P represents the inverse matrix of the rotor reference coordinate system; n This represents the 4×1 position vector of each point on the rotor mating surface in the global coordinate system;

[0034] Step 4.2: Establish the ideal pose relationship between the stator reference coordinate system and the rotor reference coordinate system, and perform virtual assembly of the stator assembly structure and the rotor assembly structure to satisfy:

[0035]

[0036] in: This represents the ideal pose relationship between the stator reference coordinate system and the rotor reference coordinate system.

[0037] To better realize the present invention, the calculation formula for the adjustment amount in step 6 is further as follows:

[0038]

[0039] Where: Δ represents the adjustment amount; z n ρ represents the height of the rotor mating surface in the second cylindrical coordinate system of the stator reference coordinate system. n d represents the polar diameter of the rotor mating surface in the second cylindrical coordinate system of the stator reference coordinate system; d represents the adjustment threshold.

[0040] To better realize the present invention, when the adjustment amount Δ > 0, the current position on the rotor mating surface needs to be lowered; when the adjustment amount Δ < 0, the current position on the rotor mating surface needs to be raised; when the adjustment amount Δ = 0, the current position on the rotor mating surface remains unchanged.

[0041] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0042] This invention uses the measured shape of the stator mating surface of the irregular mating surface rotating assembly as a benchmark to calculate the adjustment amount of the matching rotor mating surface to satisfy the full rotation state, thereby ensuring the accurate assembly of the irregular mating surface rotating body. When calculating the adjustment amount of the rotor mating surface, the calculation process of the adjustment amount is simplified by introducing a cylindrical coordinate system. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the process steps of the present invention;

[0044] Figure 2 This is a schematic diagram of the mating structure of the rotor and stator;

[0045] Figure 3 A schematic diagram of Shizuko;

[0046] Figure 4 This is a schematic diagram of the rotor;

[0047] Figure 5 This is a schematic diagram of the virtual assembly of the stator and rotor. Detailed Implementation

[0048] Example 1:

[0049] This embodiment provides a precise shaping method for a rotating assembly with irregular mating surfaces. The method involves reconstructing the stator assembly structure based on the scanned point cloud of the stator mating surfaces, calculating the first cylindrical coordinates of the scanned point cloud in the stator reference coordinate system, extracting the measured outer contour of the stator rotating body using the first cylindrical coordinates, and extrapolating the measured outer contour of the stator rotating body according to the assembly gap to form the ideal outer contour of the rotor rotating body. The method also involves reconstructing the rotor assembly structure based on the scanned point cloud of the rotor mating surfaces, virtually assembling the stator assembly structure and the rotor assembly structure, calculating the second cylindrical coordinates of the scanned point cloud of the rotor mating surfaces in the stator reference coordinate system, and calculating the adjustment amount between the ideal outer contour of the rotor rotating body and the rotor mating surfaces at corresponding points after virtual assembly.

[0050] like Figure 1 As shown, the specific steps include:

[0051] Step 1: Use a 3D scanning device to obtain the scanning point cloud of the stator mating surface and the rotor mating surface;

[0052] Step 2: Reconstruct the stator assembly structure of the stator mating surface based on the scanned point cloud of the stator mating surface, and establish a stator reference coordinate system on the stator assembly structure. Calculate the first cylinder coordinates of the scanned point cloud of the stator mating surface in the stator reference coordinate system.

[0053] Step 3: Extract the measured outer contour of the stator rotating body based on the first cylindrical coordinate, calculate the normal vector of each point on the measured outer contour of the stator rotating body, and generate the ideal outer contour of the rotor rotating body in the direction of the normal vector with the assembly gap.

[0054] Step 4: Reconstruct the rotor assembly structure of the rotor mating surfaces based on the scanned point cloud of the rotor mating surfaces, and establish a rotor reference coordinate system on the rotor assembly structure. Based on the ideal pose relationship between the stator reference coordinate system and the rotor reference coordinate system, perform virtual assembly of the stator assembly structure and the rotor assembly structure;

[0055] Step 5: Calculate the second cylindrical coordinates of the scanned point cloud of the rotor mating surface in the stator reference coordinate system;

[0056] Step 6: Calculate the adjustment amount at corresponding points between the ideal outer contour coordinates of the rotor rotating body and the second cylindrical coordinates of the rotor mating surface after virtual assembly. The stator and rotor after virtual assembly are as follows: Figure 5 As shown.

[0057] In step 1, the 3D scanning device is used to scan the image of the image. Figure 2 The irregularly shaped rotating mating structure composed of the rotor and stator shown is scanned to obtain the scanned point cloud of the stator mating surface and the scanned point cloud of the rotor mating surface.

[0058] Furthermore, step 2 specifically includes:

[0059] Step 2.1, establish as follows Figure 3 The stator reference coordinate system T shown m The vector coordinates of each point on the stator mating surface in the stator reference coordinate system are calculated as follows:

[0060]

[0061] Where: P Tm This represents the 4×1 position vector of each point on the stator mating surface in the stator reference coordinate system; T represents the stator reference coordinate system. m The inverse matrix of P; m This represents the 4×1 position vector of each point on the stator mating surface in the global coordinate system;

[0062] Step 2.2: Calculate the first cylindrical coordinates of the scanned point cloud of the stator mating surface in the stator reference coordinate system based on vector coordinates:

[0063]

[0064] Where: P Tm ·x、P Tm ·y、P Tm ·z represents the X, Y, and Z coordinates of the scanned point cloud of the stator mating surface in the stator reference coordinate system; ρ m θ m z m These represent the polar radius, polar angle, and height of the scanned point cloud of the stator mating surface in the stator reference coordinate system, respectively.

[0065] To better realize the present invention, step 3 further includes:

[0066] Step 3.1: Extract the measured outer contour of the stator rotating body using the polar radius and height of each point on the stator mating surface:

[0067]

[0068] Where: h m ·a represents the x-coordinate of each point on the measured outer contour of the stator rotating body; h m ·b represents the ordinate of each point on the measured outer contour of the stator rotating body; i represents the i-th point on the measured outer contour of the stator rotating body; Ω i Let represent the set of contour lines on the i-th mating surface of the stator, consisting of all points with the same polar radius;

[0069] Step 3.2: Calculate the normal vectors at each point on the measured outer contour of the stator rotating body. Generate the ideal outer contour of the rotor rotating body along the assembly gap in the direction of the normal vectors:

[0070]

[0071] in: These represent the abscissa and ordinate of each point on the ideal outer contour of the rotor rotating body, respectively; v m a、v m .b represents the abscissa and ordinate of the normal vector of each point on the measured outer contour of the stator rotating body, respectively; δ represents the assembly clearance.

[0072] To better realize the present invention, step 4 further includes:

[0073] Step 4.1, establish as follows Figure 4 The rotor reference coordinate system T shown n The coordinates of each point on the rotor mating surface in the rotor reference coordinate system are calculated as follows:

[0074]

[0075] Where: P Tn This represents the 4×1 position vector of each point on the rotor mating surface in the rotor reference coordinate system; Represents the rotor reference coordinate system T n The inverse matrix of P; n This represents the 4×1 position vector of each point on the rotor mating surface in the global coordinate system;

[0076] Step 4.2: Establish the ideal pose relationship between the stator reference coordinate system and the rotor reference coordinate system, and perform virtual assembly of the stator assembly structure and the rotor assembly structure to satisfy:

[0077]

[0078] in: This represents the ideal pose relationship between the stator reference coordinate system and the rotor reference coordinate system.

[0079] To better realize the present invention, the calculation formula for the adjustment amount in step 6 is further as follows:

[0080]

[0081] Where: Δ represents the adjustment amount; z n ρ represents the height of the rotor mating surface in the second cylindrical coordinate system of the stator reference coordinate system. n d represents the polar diameter of the rotor mating surface in the second cylindrical coordinate system of the stator reference coordinate system; d represents the adjustment threshold.

[0082] To better realize the present invention, when the adjustment amount Δ > 0, the current position on the rotor mating surface needs to be lowered; when the adjustment amount Δ < 0, the current position on the rotor mating surface needs to be raised; when the adjustment amount Δ = 0, the current position on the rotor mating surface remains unchanged.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for precise shaping of a rotary assembly with irregular mating surfaces, characterized in that, The stator assembly structure of the stator mating surface is reconstructed based on the scanned point cloud of the stator mating surface. The first cylindrical coordinate of the scanned point cloud of the stator mating surface in the stator reference coordinate system is calculated. The measured outer contour of the stator rotating body is extracted using the first cylindrical coordinate. The measured outer contour of the stator rotating body is extrapolated according to the assembly gap to form the ideal outer contour of the rotor rotating body. The rotor assembly structure of the rotor mating surface is reconstructed based on the scanned point cloud of the rotor mating surface. The stator assembly structure and the rotor assembly structure are virtually assembled. The second cylindrical coordinate of the scanned point cloud of the rotor mating surface in the stator reference coordinate system is calculated. The adjustment amount of the ideal outer contour of the rotor rotating body and the rotor mating surface at corresponding points after virtual assembly is calculated.

2. The precise shaping method for a rotary assembly with irregular mating surfaces according to claim 1, characterized in that, Includes the following steps: Step 1: Use a 3D scanning device to obtain the scanning point cloud of the stator mating surface and the rotor mating surface; Step 2: Reconstruct the stator assembly structure of the stator mating surface based on the scanned point cloud of the stator mating surface, and establish a stator reference coordinate system on the stator assembly structure. Calculate the first cylinder coordinates of the scanned point cloud of the stator mating surface in the stator reference coordinate system. Step 3: Extract the measured outer contour of the stator rotating body based on the first cylindrical coordinate, calculate the normal vector of each point on the measured outer contour of the stator rotating body, and generate the ideal outer contour of the rotor rotating body in the direction of the normal vector with the assembly gap. Step 4: Reconstruct the rotor assembly structure of the rotor mating surfaces based on the scanned point cloud of the rotor mating surfaces, and establish a rotor reference coordinate system on the rotor assembly structure. Based on the ideal pose relationship between the stator reference coordinate system and the rotor reference coordinate system, perform virtual assembly of the stator assembly structure and the rotor assembly structure; Step 5: Calculate the second cylindrical coordinates of the scanned point cloud of the rotor mating surface in the stator reference coordinate system; Step 6: Calculate the adjustment amount at corresponding points between the ideal outer contour coordinates of the rotor rotating body after virtual assembly and the second cylindrical coordinates of the rotor mating surface.

3. The method for precise shaping of a rotary assembly with irregular mating surfaces according to claim 2, characterized in that, Step 2 specifically includes: Step 2.1: Establish the stator reference coordinate system and calculate the vector coordinates of each point on the stator mating surface in the stator reference coordinate system: Where: P Tm This represents the 4×1 position vector of each point on the stator mating surface in the stator reference coordinate system; P represents the inverse matrix of the stator reference coordinate system; m This represents the 4×1 position vector of each point on the stator mating surface in the global coordinate system; Step 2.2: Calculate the first cylindrical coordinates of the scanned point cloud of the stator mating surface in the stator reference coordinate system based on vector coordinates: Where: P Tm ·x、P Tm ·y、P Tm ·z represents the X, Y, and Z coordinates of the scanned point cloud of the stator mating surface in the stator reference coordinate system; ρ m θ m z m These represent the polar radius, polar angle, and height of the scanned point cloud of the stator mating surface in the stator reference coordinate system, respectively.

4. The method for precise shaping of a rotary assembly with irregular mating surfaces according to claim 3, characterized in that, Step 3 specifically includes: Step 3.1: Extract the measured outer contour of the stator rotating body using the polar radius and height of each point on the stator mating surface: Where: h m ·a represents the x-coordinate of each point on the measured outer contour of the stator rotating body; h m ·b represents the ordinate of each point on the measured outer contour of the stator rotating body; i represents the i-th point on the measured outer contour of the stator rotating body; Ω i Let represent the set of contour lines on the i-th mating surface of the stator, consisting of all points with the same polar radius; Step 3.2: Calculate the normal vectors at each point on the measured outer contour of the stator rotating body. Generate the ideal outer contour of the rotor rotating body along the assembly gap in the direction of the normal vectors: in: These represent the abscissa and ordinate of each point on the ideal outer contour of the rotor rotating body, respectively; v m a、v m .b represents the abscissa and ordinate of the normal vector of each point on the measured outer contour of the stator rotating body, respectively; δ represents the assembly clearance.

5. The method for precise shaping of a rotary assembly with irregular mating surfaces according to claim 4, characterized in that, Step 4 specifically includes: Step 4.1: Establish the rotor reference coordinate system and calculate the coordinates of each point on the rotor mating surface in the rotor reference coordinate system: Where: P Tn This represents the 4×1 position vector of each point on the rotor mating surface in the rotor reference coordinate system; P represents the inverse matrix of the rotor reference coordinate system; n This represents the 4×1 position vector of each point on the rotor mating surface in the global coordinate system; Step 4.2: Establish the ideal pose relationship between the stator reference coordinate system and the rotor reference coordinate system, and perform virtual assembly of the stator assembly structure and the rotor assembly structure to satisfy: in: This represents the ideal pose relationship between the stator reference coordinate system and the rotor reference coordinate system.

6. The method for precise shaping of a rotary assembly with irregular mating surfaces according to claim 4, characterized in that, The formula for calculating the adjustment amount in step 6 is: Where: Δ represents the adjustment amount; z n ρ represents the height of the rotor mating surface in the second cylindrical coordinate system of the stator reference coordinate system. n d represents the polar diameter of the rotor mating surface in the second cylindrical coordinate system of the stator reference coordinate system; d represents the adjustment threshold.

7. The method for precise shaping of a rotary assembly with irregular mating surfaces according to claim 5, characterized in that, When the adjustment amount Δ > 0, the current position on the rotor mating surface needs to be lowered; when the adjustment amount Δ < 0, the current position on the rotor mating surface needs to be raised; when the adjustment amount Δ = 0, the current position on the rotor mating surface remains unchanged.

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