A fast data processing method for electrolytic cathode profile correction

Abstract

The application provides a kind of electrolytic cathode profile correction data fast processing method, it is related to the field of special processing technology, the application is by establishing blade and blade electrolytic cathode UG three-dimensional model, respectively import blade blade profile surface and blade electrolytic cathode forming surface curve into reverse engineering software, save two point cloud files, add vector information to each point in point cloud, form point cloud file with vector direction;Carry out point cloud point coordinate extraction, separate X, Y coordinate and Z coordinate, calculate the Z direction deviation direction and deviation of actual blade blade profile surface corresponding to each vector point on blade blade profile surface, respectively after reverse processing, obtain the new Z value of electrolytic cathode forming surface point cloud, replace Z value, to obtain new electrolytic cathode forming surface point cloud coordinate, generate new electrolytic cathode forming curve;Use new electrolytic cathode forming surface to carry out die programming, realize electrolytic cathode profile correction.

Description

Technical Field

[0001] This invention relates to the field of special processing technology, and in particular to a rapid data processing method for electrolytic cathode profile correction. Background Technology

[0002] The die forging of compressor journal blades for aero-engines and the CNC milling process can cause blade deformation, resulting in blade profile twisting and positional deviations in some sections. To address this, precision electrolytic forming technology has been introduced.

[0003] Currently, for cathode optimization in precision electrolytic forming technology, the process involves first electrolytically machining the blade part using an initial cathode profile, then inspecting the blade profile to identify out-of-tolerance locations and amounts. Based on these out-of-tolerance locations and amounts, the profile of the corresponding electrolytic cathode position is manually adjusted on the UG platform, with compensation performed in the opposite direction. The cathode profile is then programmed and refined according to the compensated cathode profile model before precision electrolytic machining of the blade part is performed. This process is repeated until the blade profile meets the design requirements. However, during the iterative process of precision electrolytic forming, the optimization of the cathode profile in blade electrolytic forming involves a large workload, high dispersion, and difficulty in achieving convergence of iterative results. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a rapid data processing method for electrolytic cathode profile correction. In the research on the iterative method of cathode for precision electrolytic forming of biaxial journal blades based on deformation control, the cathode iterative optimization workload is large, and the deviation dispersion of the electrolytically formed blade profile is high after the cathode blade profile is corrected. Therefore, a method is developed to solidify the cathode profile optimization process, avoid introducing unnecessary boundary elements during the process iteration, make the iteration process stable and convergent, and quickly complete the process development.

[0005] A rapid data processing method for electrolytic cathode profile correction includes the following steps:

[0006] Step 1: Use modeling software to create a theoretical 3D model of the blade. Based on the coordinate system of the theoretical 3D model of the blade and the actual measured blade profile data, create a UG 3D model of the blade and the blade electrolytic cathode. Its coordinate axis is the XYZ coordinate axis. Obtain the blade blade profile surface and the blade electrolytic cathode forming surface, and save them as two surface files.

[0007] Step 2: Import the two surface files obtained in Step 1 into reverse engineering software, generate point clouds with a point spacing of x mm in the u direction and y mm in the v direction, and save them as two point cloud files.

[0008] The uv direction refers to the horizontal and vertical directions of the curved surface, respectively.

[0009] Step 3: Import the two point cloud files obtained in Step 2 into the modeling software, add vector information to each point in the point cloud, and form a point cloud file with vector direction;

[0010] Step 4: Extract the point coordinates of the vector point cloud of the electrolytic cathode forming surface in a certain order, separate the X, Y and Z coordinates, import them into an Excel file and save them;

[0011] Step 5: Import the theoretical 3D model of the blade into the GOM blue light photogrammetry device. Import the point cloud file with vector direction corresponding to the theoretical 3D model of the blade into the GOM blue light photogrammetry device.

[0012] Step 6: Perform blue light photography and scanning measurement on the blade body after electrolytic processing. Use the actual blade body point cloud file obtained by scanning as the target point set. The theoretical 3D model of the blade uses the blade body surface as the reference point set. Perform optimal region matching fitting according to the ICP algorithm, and converge to f(R,T)≤0.03mm.

[0013]

[0014] Where: P i =(p1,p2,…,p n Let Q be the target point set. i ={q1,q2,…,q n Let} be the reference point set, R be the rotation matrix, T be the translation vector; N be the total number of points in the point set, p n With q n These are the nth target point and the reference point, respectively.

[0015] Step 7: Calculate the Z-axis deviation direction and amount of the actual blade profile corresponding to each vector point on the blade profile. Import the deviation amounts at all vector points into an Excel file, adjust the format, and then save the Excel file in the order of Step 4.

[0016] Step 8: After reversing the Z-axis deviation of the blade profile obtained in Step 7 in Excel software, add it to the Z coordinate of each point in the point cloud obtained in Step 4 to obtain a new Z value of the point cloud of the electrolytic cathode forming surface.

[0017] Step 9: Replace the Z value with the data obtained in Step 8 for the point cloud coordinates of the electrolytic cathode forming surface obtained in Step 4, so as to obtain the new point cloud coordinates of the electrolytic cathode forming surface.

[0018] Step 10: Use the modeling software platform for reverse engineering to generate a new electrolytic cathode forming curve from the new point cloud coordinates of the electrolytic cathode forming surface obtained in Step 9.

[0019] Step 11: Under the original theoretical three-dimensional model of the electrolytic cathode model, use the new electrolytic cathode forming surface for model modification programming to realize the correction of the electrolytic cathode surface.

[0020] The beneficial effects of adopting the above technical solution are as follows:

[0021] This invention provides a rapid data processing method for electrolytic cathode profile correction. After the point cloud of the blade profile and electrolytic cathode profile is divided, all subsequent operations are fixed in the software, avoiding the risks of uncertainties introduced by manual operation, reducing the intensity of manual iterative optimization of the electrolytic cathode profile, and making the electrolytic cathode modeling process stable and reliable during process iteration. This method can be efficiently used for multiple cathode modeling process iterations. Attached Figure Description

[0022] Figure 1 This is an overall flowchart of the data fast processing method in an embodiment of the present invention. Detailed Implementation

[0023] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0024] A rapid data processing method for electrolytic cathode profile correction, such as Figure 1 As shown, it includes the following steps:

[0025] Step 1: Use modeling software to create a theoretical 3D model of the blade. Based on the coordinate system of the theoretical 3D model of the blade and the actual measured blade profile data, create a UG 3D model of the blade and the blade electrolytic cathode. Its coordinate axis is the XYZ coordinate axis. Obtain the blade blade profile surface and the blade electrolytic cathode forming surface, and save them as two surface files.

[0026] Step 2: Import the two surface files obtained in Step 1 into reverse engineering software. In this embodiment, Imageware software is used to generate point clouds with a spacing of x mm in the u direction and a spacing of y mm in the v direction, and save them as two point cloud files.

[0027] The uv direction refers to the horizontal and vertical directions of the curved surface, respectively.

[0028] x and y can be determined according to the actual situation. Point cloud processing is performed on the design models of the electrolytic cathode and the blade. In the UG drawings of the electrolytic cathode and blade design models, the surface information of the models is extracted in the original coordinate system, imported into Imageware software, and point clouds are generated with a point spacing of 0.1mm in both the u and v directions.

[0029] Step 3: Import the two point cloud files obtained in Step 2 into the modeling software. In this embodiment, GeometryStudio software is used to add vector information to each point in the point cloud to form a point cloud file with vector direction.

[0030] Step 4: Extract the point coordinates of the vector point cloud of the electrolytic cathode forming surface in a certain order, separate the X, Y and Z coordinates, import them into an Excel file and save them;

[0031] Step 5: Import the theoretical 3D model of the blade into the GOM blue light photogrammetry device. Import the point cloud file with vector direction corresponding to the theoretical 3D model of the blade into the GOM blue light photogrammetry device.

[0032] Step 6: Perform blue light photography and scanning measurement on the blade body after electrolytic processing. Use the actual blade body point cloud file obtained by scanning as the target point set. The theoretical 3D model of the blade uses the blade body surface as the reference point set. Perform optimal region matching fitting according to the ICP algorithm, and converge to f(R,T)≤0.03mm.

[0033]

[0034] Where: P i =(p1,p2,…,p n Let Q be the target point set. i ={q1,q2,…,q n Let} be the reference point set, R be the rotation matrix, T be the translation vector; N be the total number of points in the point set, p n With q n These are the nth target point and the reference point, respectively.

[0035] Step 7: Calculate the Z-axis deviation direction and amount of the actual blade profile corresponding to each vector point on the blade profile. Import the deviation amounts at all vector points into an Excel file, adjust the format, and then save the Excel file in the order of Step 4.

[0036] In this embodiment, under the optimal fit condition, the "intersection with the grid" measurement principle is used to calculate each point in the imported point cloud file with vector direction, obtain the actual corresponding point of each theoretical point on the measured point cloud of the blade, and calculate the deviation value between the actual point and the theoretical point.

[0037] Step 8: After reversing the Z-axis deviation of the blade profile obtained in Step 7 in Excel software, add it to the Z coordinate of each point in the point cloud obtained in Step 4 to obtain a new Z value of the point cloud of the electrolytic cathode forming surface.

[0038] In this embodiment, the reverse processing involves multiplying the deviation value by (-1) and adding it to each point in the point cloud extracted from the blade electrolytic cathode design model.

[0039] Step 9: Replace the Z value with the data obtained in Step 8 for the point cloud coordinates of the electrolytic cathode forming surface obtained in Step 4, so as to obtain the new point cloud coordinates of the electrolytic cathode forming surface.

[0040] Step 10: Reverse engineering using a modeling software platform. In this embodiment, UG software is used to generate a new electrolytic cathode forming curve from the new point cloud coordinates of the electrolytic cathode forming surface obtained in Step 9.

[0041] Step 11: Under the original theoretical three-dimensional model of the electrolytic cathode model, use the new electrolytic cathode forming surface for model modification programming to realize the correction of the electrolytic cathode surface.

[0042] In this embodiment, the point cloud file extracted from the calculated blade electrolytic cathode design model is imported into Imageware software to generate a sheet file. The sheet file is then imported into UG software for milling programming.

[0043] The above description is merely a preferred embodiment of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A rapid data processing method for electrolytic cathode profile correction, characterized in that, Includes the following steps: Step 1: Use modeling software to create a theoretical 3D model of the blade. Based on the coordinate system of the theoretical 3D model of the blade and the actual measured blade profile data, create a UG 3D model of the blade and the blade electrolytic cathode. Its coordinate axis is the XYZ coordinate axis. Obtain the blade blade profile surface and the blade electrolytic cathode forming surface, and save them as two surface files. Step 2: Import the two surface files obtained in Step 1 into reverse engineering software, generate point clouds with a point spacing of x mm in the u direction and y mm in the v direction, and save them as two point cloud files. Step 3: Import the two point cloud files obtained in Step 2 into the modeling software, add vector information to each point in the point cloud, and form a point cloud file with vector direction; Step 4: Extract the point coordinates of the vector point cloud of the electrolytic cathode forming surface in a certain order, separate the X, Y and Z coordinates, import them into an Excel file and save them; Step 5: Import the theoretical 3D model of the blade into the GOM blue light photogrammetry device. Import the point cloud file with vector direction corresponding to the theoretical 3D model of the blade into the GOM blue light photogrammetry device. Step 6: Perform blue light scanning and measurement on the blade after electrolytic processing. Use the obtained point cloud file of the actual blade as the target point set. The theoretical 3D model of the blade uses the blade profile as the reference point set. Perform optimal region matching and fitting according to the ICP algorithm, converging to... f ( R , T ≤0.03mm; ； in: i = ( 1, 2, … , n Let Q be the target point set. i = { 1, 2, … , n } is the reference point set. For rotation matrix, T The translation vector is n; n is the total number of points in the point set, and p is the translation vector. n With q n These are the nth target point and the reference point, respectively. Step 7: Calculate the Z-axis deviation direction and amount of the actual blade profile corresponding to each vector point on the blade profile. Import the deviation amounts at all vector points into an Excel file, adjust the format, and then save the Excel file in the order of Step 4. Step 8: After reversing the Z-axis deviation of the blade profile obtained in Step 7 in Excel software, add it to the Z coordinate of each point in the point cloud obtained in Step 4 to obtain a new Z value of the point cloud of the electrolytic cathode forming surface. Step 9: Replace the Z value with the data obtained in Step 8 for the point cloud coordinates of the electrolytic cathode forming surface obtained in Step 4, so as to obtain the new point cloud coordinates of the electrolytic cathode forming surface. Step 10: Use the modeling software platform for reverse engineering to generate a new electrolytic cathode forming curve from the new point cloud coordinates of the electrolytic cathode forming surface obtained in Step 9. Step 11: Under the original theoretical three-dimensional model of the electrolytic cathode model, use the new electrolytic cathode forming surface for model modification programming to realize the correction of the electrolytic cathode surface.

2. The rapid data processing method for electrolytic cathode profile correction according to claim 1, characterized in that, In step 2, the v direction refers to the horizontal and vertical directions of the curved surface, respectively.

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