Adaptive back-taper machining method for brazing blade disc based on in-machine measurement

Abstract

The application discloses a kind of based on in-machine measurement's brazing blade disc self-adapting root processing method, comprising: S1, constructs blade disc theoretical model, and generates theoretical processing tool path;S2, clamping and fixing to be processed blade disc;S3, in the blade body of target blade planning first parametric line, and planning a row of measurement points on first parametric line and in-machine measurement, multiple measurement points are planned on the blade tip shroud surface and in-machine measurement, and calculate blade registration matrix, and blade alignment is carried out to be processed blade disc;S4, a second parametric line is planned on the blade body of blade after alignment, and a row of measurement points are planned on second parametric line and in-machine measurement, to obtain blade profile error;S5, according to blade registration matrix, blade profile error and blade disc theoretical model generate actual blade model;S6, according to actual blade model adjustment processing tool path, and the root processing of target blade is carried out.The application can effectively improve processing quality and processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of CNC milling manufacturing technology for integral bladed disks of aero engines, and particularly to an adaptive root cleaning method for brazed bladed disks based on in-machine measurement. Background Technology

[0002] like Figure 1 As shown, the brazed blade disk includes a hub 1 and blades 2. 65 blades 2 are fixed to the hub 1 by brazing. Due to blade positioning issues, each blade may have positional deviations in its degrees of freedom during brazing, and since the blades are manufactured independently, they may also have some contour errors. The minimum blade spacing is 2.2 mm, the diameter of the hub surface at the blade welding point is 253.5 mm, the reference end face is the large end face, the reference outer circle is the hub outer circle at the blade welding point, and there is no angular reference.

[0003] During the brazing of blades, a significant amount of solder remains at the weld joint (point 3), requiring the removal of excess solder (commonly known as root cleaning). Currently, root cleaning of brazed blade disks is primarily accomplished through a combination of power tools and manual polishing. Manual polishing demands a high level of worker skill and technique; even slight mishaps can damage the blade with the polishing head, posing a certain risk. Furthermore, it is inefficient and produces poor surface quality. Simultaneously, worker skill levels require extensive training and accumulation, and the polishing workshop is noisy, dusty, and has a poor working environment, potentially impacting the health of operators. High staff turnover in polishing positions hinders the accumulation of polishing techniques, leading to inconsistent part quality during polishing. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an adaptive root cleaning method for brazed blade disks based on in-machine measurement, which has high processing efficiency and good processing quality.

[0005] To address the aforementioned problems, this invention provides an adaptive root cleaning method for brazed blade disks based on in-machine measurement, comprising the following steps:

[0006] S1. Construct a theoretical model of the blade disk and generate theoretical machining toolpaths;

[0007] S2. Clamp and fix the blade disk to be processed;

[0008] S3. Plan the first-order parameter line on the blade body of the target blade, and plan a row of measurement points on the first-order parameter line for in-machine measurement. Plan multiple measurement points on the blade tip shroud surface for in-machine measurement, calculate the blade registration matrix, and perform blade alignment on the blade disk to be processed.

[0009] S4, a second parametric line is planned on the corrected blade, and a row of measuring points are planned on the second parametric line for in-machine measurement to obtain a blade profile error;

[0010] S5, an actual blade model is generated according to the blade registration matrix, the blade profile error and the blade disc theoretical model;

[0011] S6, a machining tool path is adjusted according to the actual blade model, and a target blade is subjected to a root processing.

[0012] In an embodiment of the present application, the number of the first parametric lines is two, and the two first parametric lines are parallel and cooperate with the plurality of measuring points on the tip shroud surface to correct the blade.

[0013] In an embodiment of the present application, in step S2, the blade disc to be processed is clamped and fixed by a clamping tool; the clamping tool comprises a support seat and a pressing plate, the support seat is connected with a workbench, the blade disc to be processed is positioned by a reference end surface and a hub outer circle, and is pressed by the pressing plate.

[0014] In an embodiment of the present application, the method further comprises the following steps:

[0015] S7, the next blade is taken as a target blade, and steps S2-S6 are executed until the root processing of all blades on the blade disc to be processed is completed.

[0016] In an embodiment of the present application, in step S1, a UG software is used to construct a blade disc theoretical model.

[0017] In an embodiment of the present application, in step S1, a flow channel machining strategy of an UltraCAM software is used to generate a theoretical machining tool path, a depth range is set, and a lifting tool path removes residual solder of the blade body.

[0018] The present application also provides a computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to realize the steps of the method of any one of the above.

[0019] The present application also provides a computer readable storage medium, which stores a computer program, wherein the program is executed by a processor to realize the steps of the method of any one of the above.

[0020] The present application also provides a processor, which is used to run a program, wherein the program is executed to realize the method of any one of the above.

[0021] The present application also provides a brazing blade disc, which is processed by the brazing blade disc adaptive root processing method based on in-machine measurement of any one of the above.

[0022] The beneficial effects of the present application are as follows:

[0023] The adaptive root processing method for brazing blade disc based on in-machine measurement of the present application determines the actual position and profile error of the blade, reconstructs the actual blade disc model, and adaptively adjusts the theoretical tool path, so that the processing surface and the original surface are smoothly connected, avoiding the use of electric tools and manual finishing and polishing, effectively ensuring the processing quality of the parts, and significantly improving the processing efficiency of the parts.

[0024] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are as follows. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of a brazing blade disc;

[0026] Figure 2 is a flowchart of the adaptive root processing method for brazing blade disc based on in-machine measurement in embodiment one of the present application;

[0027] Figure 3 is a schematic diagram of the theoretical processing tool path in embodiment one of the present application;

[0028] Figure 4 is a schematic diagram of the planned blade alignment measurement point and blade tip measurement point in embodiment one of the present application;

[0029] Figure 5 is a schematic diagram of the planned blade profile measurement point in embodiment one of the present application;

[0030] Figure 6 is a measurement path of the planned blade alignment measurement point, blade tip measurement point and blade profile measurement point in embodiment one of the present application;

[0031] Figure 7 is a measurement needle setting page in UltraCAM in embodiment one of the present application;

[0032] Figure 8 is a measurement path parameter setting page in UltraCAM in embodiment one of the present application;

[0033] Figure 9 is a blade alignment best fitting mode page in embodiment one of the present application;

[0034] Figure 10 is an adaptive mode page of UltraFIT in embodiment one of the present application;

[0035] Figure 11 is the page of connecting UltraFIT with machine tool in embodiment one of the present application;

[0036] Figure 12 is the blade profile error diagram obtained in embodiment one of the present application;

[0037] Figure 13 is the actual blade model generated in embodiment one of the present application;

[0038] Figure 14 is the page of configuring UltraCAM program path in embodiment one of the present application;

[0039] Figure 15 is the page of configuring UltraCAM project file path in embodiment one of the present application;

[0040] Figure 16 is the page of selecting post-processing configuration file in embodiment one of the present application.

[0041] Marking description:

[0042] 1, hub; 2, blade; 3, welding place. DETAILED DESCRIPTION

[0043] The present application will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present application and implement it, but the embodiments are not limiting to the present application.

[0044] Embodiment one

[0045] As shown in Figure 2 , the embodiment discloses a self-adaptive root cleaning processing method of brazed blade disc based on in-machine measurement, comprising the following steps:

[0046] Step S1, constructing a blade disc theoretical model and generating a theoretical processing tool path;

[0047] Optionally, in step S1, the UG software is used to construct the blade disc theoretical model, and the format is *.iges or *.step.

[0048] Optionally, since the residual solder covers the hub area between the blade roots and the blades, in step S1, the flow channel processing strategy of the UltraCAM software is used to compile the processing tool path, the depth range is set, and the tool path is lifted to remove the residual solder of the blade body.

[0049] In an embodiment of the present application, the depth range is set to 0.4-1.0, and the processing parameters are shown in Table 1. The theoretical processing tool path is shown in Figure 3 .

[0050] Table 1 Processing parameters

[0051]

[0052] Optionally, in this embodiment, equipment is used for processing:

[0053] Machine tool: Aomeite GS1000 / 5-T five-axis machine tool;

[0054] CNC system: Heidenhain TNC530;

[0055] Probe: Renishaw OMP400;

[0056] Step S2: Clamp and fix the blade disk to be processed;

[0057] In one embodiment of the present invention, in step S2, the blade disk to be processed is clamped and fixed by a clamping fixture; the clamping fixture includes a support base and a pressure plate, the support base is connected to the worktable, the blade disk to be processed is positioned by the reference end face and the outer circle of the hub, and is pressed by the pressure plate.

[0058] Step S3: Plan the first-order parameter line on the blade body of the target blade, and plan a row of measurement points on the first-order parameter line for in-machine measurement, denoted as blade alignment measurement points. Plan multiple measurement points on the blade tip shroud surface for in-machine measurement, denoted as blade tip measurement points, and calculate the blade registration matrix to align the blade disk to be processed; wherein, the blade alignment measurement points refer to... Figure 4 Left-middle image, reference point for leaf tip measurement Figure 4 The image is shown in the middle right corner.

[0059] Optionally, the number of the first isoparameter lines is two, and the two first isoparameter lines are parallel and cooperate with multiple measurement points on the blade tip shroud surface to perform blade alignment.

[0060] Specifically, since the blade is a ruled surface, two rows of measurement points are planned during the blade alignment stage. Simultaneously, six measurement points are planned on the blade tip shroud to constrain the blade's Z-degree of freedom of translation, working together with the blade measurement points to align the position of a single blade. During the profile compensation stage, an isoparametric line is planned for measuring the blade to obtain the blade profile error, which is then compensated for across the entire blade. The measurement scheme is shown in Table 2.

[0061] Table 2 Measurement Scheme

[0062]

[0063] Step S4: Draw a second isoparameter line on the blade after alignment, and plan a row of measurement points on the second isoparameter line for in-machine measurement to obtain the blade profile error; wherein, the measurement points planned on the second isoparameter line are recorded as blade profile measurement points, referring to... Figure 5 .

[0064] Further, the measurement path of the blade alignment measurement point, the blade tip measurement point and the blade profile measurement point is shown in the following figure Figure 6 In the figure, the left side is the measurement path of the blade alignment measurement point, the middle is the measurement path of the blade tip measurement point, and the right side is the measurement path of the blade profile measurement point. The corresponding measurement path is obtained by setting the measuring needle, the measurement path parameter and the direction of the measuring needle. Referring to Figure 7 It is the measuring needle setting page in UltraFIT, referring to Figure 8 It is the measurement path parameter setting page in UltraFIT.

[0065] For the adaptive machining of the root of the whole blade disc, the adaptive tool path adjustment of the transition area between the actual blade and the hub surface is involved, and the distance between the blades of the brazing disc is small, so the control of the tool axis is high. Therefore, the method of constructing an actual blade, then automatically calling UltraCAM to replace the blade and calculating the tool path, and finally returning the tool path to UltraFIT to complete the adaptive machining is adopted to realize the residual solder machining of the brazing blade disc.

[0066] Before measuring the blade profile and constructing the actual blade, the alignment measurement points and the blade tip measurement points under the reference group are measured in sequence, the registration matrix is calculated according to the best fitting mode, and the blade is aligned. Since there may be deviations in six degrees of freedom during brazing of the blade, the best fitting mode of the "reference group" is selected as the full-degree-of-freedom registration mode of "point-surface", "rotation + translation" and "3-axis of freedom". Referring to Figure 9 .

[0067] Since the adaptive machining is performed by constructing an actual blade and then calling UltraCAM to automatically calculate the tool path, the tool path generated by UltraCAM software is the adaptive tool path matched with the actual blade, so the adaptive mode of UltraFIT is set to be unchanged. Referring to Figure 10 .

[0068] When connecting the machine tool, the "setting" command under the "engineering" menu of the UltraFIT software is selected to enter the option dialog box, "numerical control system" is selected, "Heidenhain" numerical control system is selected, and the corresponding Ometec GS1000 machine tool is selected, that is, the connection of the UltraFIT software and the numerical control machine tool is completed, and the adaptive software can drive the machine tool to measure the workpiece, return the measurement result, send the machining program, drive the machine tool to process and the like. Referring to Figure 11 . Referring to Figure 12 It is a schematic diagram of the blade profile error obtained in one embodiment.

[0069] Step S5, generating an actual blade model according to the blade registration matrix, the blade profile error and the blade disc theoretical model; referring to Figure 13 It is the generated actual blade model;

[0070] Specifically, in the UltraFIT software, "Generate Adaptive Model" under "Machining" is selected, and the actual blade is calculated according to the registration matrix, the blade profile error and the theoretical blade in the theoretical model of the blade disc.

[0071] Specifically, referring to Figure 14-15 , the UltraCAM calculation is started, the "Settings" under the "Engineering" menu is selected, the "Options dialog box" is opened, the UltraCAM program path is configured by switching to the "General" page, the "Machining" node opens the "Machining Properties" dialog box, and the UltraCAM engineering file path is configured by switching to the "Blade Repair Settings" page. The "Start UltraCAM calculation" under the "Machining" node is selected, and the UltraFIT automatically starts the UltraCAM software, replaces the original theoretical blade with the actual blade of the module, and calculates the tool path. After the calculation is completed, the tool path is automatically saved to the specified directory, and the UltraFIT software automatically reads the tool path according to the set directory.

[0072] Step S6, adjusting the machining tool path according to the actual blade model, and performing the root processing of the target blade.

[0073] Specifically, after the adaptive mode is executed on the tool path during machining, the "adaptive tool path" node is automatically added. Since the adaptive mode is "unchanged", the adaptive tool path is the same as the UltraCAM calculation tool path automatically read. The "post-processing configuration file" of the corresponding machine tool is selected on the "post-processing" page of the "options" dialog box, and the post-processor configuration is completed as shown in Figure 16 . The "machining" operation is performed on the "adaptive tool path" node, and the UltraFIT software directly completes the post-processing of the adaptive tool path and sends the NC file to the machine tool for machining.

[0074] In an embodiment of the present application, the following steps are further included:

[0075] Step S7, taking the next blade as the target blade, and performing steps S2-S6 until the root processing of all blades on the blade disc to be machined is completed.

[0076] The brazed blade disc has a total of 65 blades, and a single "blade repair" module node can only complete the measurement, adaptation and machining operation of one blade. Therefore, the "array module" function is used to generate the remaining 64 "blade repair" module nodes in a circumferential array mode around the Z axis. The total of 65 "blade repair nodes" are added to the automation queue in order, and the "execute" is clicked to completely automatically perform the adaptive machining of the entire blade disc.

[0077] Through on-site processing verification, UltraFIT can complete the self-adaptive processing of the flow channel of the brazed blade disc, the blade is aligned by measurement, the actual blade profile is reconstructed, the self-adaptive tool path is generated, and the processing result meets the accuracy and tool joint requirements.

[0078] The brazed blade disc self-adaptive finishing processing method based on on-machine measurement of the present application determines the actual position and profile error of the blade, reconstructs the actual blade disc model, and adaptively adjusts the theoretical tool path, so that the processing surface and the original surface are smoothly connected, and the manual finishing and polishing by electric tools are avoided, thereby effectively ensuring the processing quality of the part and significantly improving the processing efficiency of the part.

[0079] The present application also provides a computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method of any one of the above embodiments when executing the program.

[0080] The preferred embodiment of the present application also provides a computer readable storage medium, which stores a computer program, and the program is executed by the processor to implement the steps of the method in the above embodiments.

[0081] The preferred embodiment of the present application also provides a processor, which is used to run a program, wherein the program is executed to implement the method in the above embodiments.

[0082] The preferred embodiment of the present application also provides a brazed blade disc, which is processed by the brazed blade disc self-adaptive finishing processing method based on on-machine measurement.

[0083] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent replacement or transformation of the present application based on the present application is within the protection scope of the present application. The protection scope of the present application is subject to the claims.

Claims

1. A self-adapting scarfing method for a brazing blade disk based on in-machine measurement, characterized by, The method comprises the following steps: S1, constructing a theoretical model of the blade disc and generating a theoretical machining tool path; S2, clamping and fixing the blade disc to be machined; S3, planning a first parametric line on the blade body of the target blade and planning a row of measurement points on the first parametric line for in-machine measurement, planning a plurality of measurement points on the tip shroud surface for in-machine measurement, and calculating a blade registration matrix to perform blade alignment on the blade disc to be machined; S4, planning a second parametric line on the blade body of the aligned blade and planning a row of measurement points on the second parametric line for in-machine measurement to obtain a blade profile error; S5, generating an actual blade model according to the blade registration matrix, the blade profile error, and the theoretical model of the blade disc; S6, adjusting the machining tool path according to the actual blade model to perform a finishing machining on the target blade; S7, taking the next blade as the target blade and performing steps S2-S6 until the finishing machining on all blades of the blade disc to be machined is completed.

2. The self-adaptive scarfing process of a brazing blade disk based on on-machine measurement according to claim 1, characterized in that, The number of the first parametric lines is two, and the two first parametric lines are parallel and cooperate with the plurality of measurement points on the tip shroud surface to perform blade alignment.

3. The self-adaptive scarfing process of a brazing blade disk based on on-machine measurement according to claim 1, characterized in that, In step S2, the blade disc to be machined is clamped and fixed by a clamping tool; the clamping tool comprises a support seat and a pressing plate, the support seat is connected with a workbench, the blade disc to be machined is positioned by a reference end surface and a hub outer circle, and the pressing plate is used for pressing.

4. The self-adaptive scarfing process of a brazing blade disk based on on-machine measurement according to claim 1, characterized in that, In step S1, the theoretical model of the blade disc is constructed by using UG software.

5. The self-adaptive scarfing process of a brazing blade disk based on on-machine measurement according to claim 1, wherein, In step S1, the theoretical machining tool path is generated by using the flow channel machining strategy of UltraCAM software, a depth range is set, and the tool path is lifted to remove the residual solder of the blade body.

6. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the steps of the method of any one of claims 1 to 5 when executing the program.

7. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the steps of the method of any one of claims 1 to 5.

8. A processor, comprising: The processor is configured to run a program, and the program, when running, implements the method of any one of claims 1 to 5.

9. A brazed vane disc, characterized by The brazed blade disc is machined by using the self-adaptive finishing machining method based on in-machine measurement of any one of claims 1 to 5.

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