Self-adaptive positioning tool for axial flow compressor blade remanufacturing

Abstract

The utility model relates to the technical field of manufacturing of axial flow compressor blades, in particular to a self-adaptive positioning tool for remanufacturing of axial flow compressor blades, which comprises a positioning table, a first positioning table, a second positioning table, a first positioning table and a second positioning table. The clamp table is arranged above the positioning table, an open hole is formed in the clamp table, and the center of the open hole is coaxial with the center of the second fixing piece and coaxial with the center of the first fixing piece; and the multiple clamp assemblies are arranged on the clamp table in the circumferential direction, each clamp assembly comprises at least one curvature clamping block, and the curvature of the curvature clamping blocks is matched with the curvature of the molded surface of the target axial flow compressor blade. The top end and the molded surface of the target axial flow compressor blade are fixed based on the positioning table and the multiple clamp assemblies on the clamp table, the tensile stress and the torsional stress borne by the axial flow compressor blade due to machining are effectively relieved, and low-stress clamping and self-adaptive positioning in the remanufacturing process are achieved.

Description

Technical Field

[0001] This application relates to the field of axial compressor blade manufacturing technology, and in particular to an adaptive positioning tooling for the remanufacturing of axial compressor blades. Background Technology

[0002] Axial compressor blade assemblies are annular structures composed of multiple stationary blades, installed between rotors or at the diffuser inlet. During compressor operation, the angle of the stationary blades controls airflow direction, ensuring the airflow accurately flows into the next stage of moving blades in the designed direction, thus guaranteeing the stability of the internal flow field. Simultaneously, as gas flows through the stationary blades, optimization of parameters such as blade profile and curvature brings the gas closer to an ideal state during compression, reducing energy loss and improving airflow quality, pressure, and flow rate. During the initial manufacturing of axial compressor blade profiles, a center hole is typically created at the tip of the raw blade material as a process hole for clamping and subsequent machining on the machine tool platform. After blade manufacturing, this center hole is removed to facilitate blade installation and unit operation before further installation and operation. Therefore, if blades develop defects such as chips or scratches after manufacturing, failing to meet process requirements, newly manufactured blades must be used, and the defective blades are scrapped.

[0003] In existing positioning fixtures for axial compressor blades, the three-dimensional twisted surface of the stationary blade is difficult to fully conform to the fixed clamp. Therefore, the positioning fixture can only clamp one end of the rectangular tenon of the axial compressor blade. In this case, due to the high vibration value at the unclamped end, machining accuracy cannot be guaranteed. The residual stress inside the blade will continuously change, easily causing stress deformation and preventing stable positioning. Furthermore, a positioning error greater than 0.2mm will lead to uneven thickness of the laser cladding layer on the blade, failing to meet the process requirements of axial compressors. Moreover, the rigid clamping of the stationary blade by the mechanical combination clamp of traditional positioning fixtures causes the clamping force to concentrate on the nickel-based alloy blade, inducing microcracks and resulting in secondary damage to the stationary blade. Utility Model Content

[0004] To address the aforementioned issues, this invention provides an adaptive positioning fixture for the remanufacturing of axial compressor blades. Based on a positioning table and multiple clamping components on the fixture table, the top tip and profile of the target axial compressor blade are fixed, effectively reducing the tensile and torsional stresses on the axial compressor blades caused by processing, and achieving low-stress clamping and adaptive positioning during the remanufacturing process.

[0005] To achieve the objectives of this application, the present utility model provides the following technical solution:

[0006] In a first aspect, this application provides an adaptive positioning fixture for remanufacturing axial compressor blades, comprising:

[0007] The positioning platform includes a first fixing member and a second fixing member, wherein the second fixing member is disposed inside the first fixing member, and the upper surface of the second fixing member is flush with the upper surface of the first fixing member.

[0008] A fixture table is disposed above the positioning table and has an opening inside. The center of the opening is coaxial with the center of the second fixing member and also with the center of the first fixing member.

[0009] Multiple clamping assemblies are circumferentially disposed on the clamping table, each clamping assembly including at least one curvature clamping block, the curvature of which is adapted to the surface curvature of the target axial compressor blade.

[0010] In one possible implementation, the target axial compressor blade has at least a first positioning reference surface and a second positioning reference surface; during positioning, the first positioning reference surface is connected to the upper surface of the second fixing member, and the second positioning reference surface is connected to the curvature surface of the curvature clamp.

[0011] In one possible implementation, the second fixing member is a vacuum adsorption assembly, which includes a vacuum generator and a plurality of honeycomb suction hole units connected to the vacuum generator: wherein each of the honeycomb suction hole units is configured to be independently controlled, and the plurality of honeycomb suction hole units apply an axial force to the target axial compressor blades based on the first positioning reference.

[0012] In one possible implementation, the vacuum adsorption component is a vacuum suction cup, and the dial of the vacuum suction cup is made of aluminum alloy, carbon fiber, or a polymer material.

[0013] In one possible implementation, the second fastener is one or more magnetic cores.

[0014] In one possible implementation, the plurality of clamping assemblies are distributed around the positioning stage based on a preset angle; the clamping assembly further includes a clamping base and a fixing screw; the clamping base is connected to the curvature clamping block through the fixing screw, wherein the clamping base is L-shaped and its base is fixed to the upper surface of the clamping stage.

[0015] In one possible implementation, a bracket is provided on the positioning platform, and the bracket has an internal channel for the target axial compressor blades to pass through.

[0016] In one possible implementation, the bracket includes a plurality of support members, each of which is bolted to the edge of the positioning platform.

[0017] In one possible implementation, the support member is a telescopic rod.

[0018] In one possible implementation, the positioning table is bolted movably connected to any machining platform.

[0019] The adaptive positioning fixture for remanufacturing axial compressor blades provided in this application restricts the axial displacement of the axial compressor blades by adsorbing and limiting the axial orientation. This achieves axial fixation, and then the blades are circumferentially fixed by surface-fitting through the fixture table and multiple fixture components on the fixture table. This restricts the radial displacement of the blades during remanufacturing and reduces the internal stress of the blade profile. This effectively prevents torsional and bending deformation caused by processing, and allows the already formed axial compressor blades to be remanufactured, promoting the reuse of materials and opening up new ideas for green manufacturing. Attached Figure Description

[0020] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0021] Figure 1 A schematic diagram of the adaptive positioning tooling for remanufacturing axial compressor blades provided in an embodiment of this application;

[0022] Figure 2 A schematic diagram of the assembly structure of the positioning stage provided in an embodiment of this application;

[0023] Figure 3 A schematic diagram of an optional structure of the clamping assembly provided in an embodiment of this application;

[0024] Figure 4 This is a flowchart illustrating the adaptive positioning method for remanufacturing axial compressor blades provided in an embodiment of this application.

[0025] Figure label:

[0026] 11, First fixing component; 12, Second fixing component; 2, Fixture table; 3, Fixture assembly; 31, Curvature clamping block; 32, Fixing screw; 33, Fixture fixing seat; 4, Target axial compressor blade; 5, Support component. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.

[0029] Axial compressor blades are an indispensable component of compressors, typically installed between rotors or at the diffuser inlet. They are annular structures composed of multiple stationary blades. By adjusting the angle of the stationary blades, they control the airflow direction and pre-compress, thereby improving airflow quality and increasing pressure and flow rate. One end of an axial compressor blade is an elliptical plane, and the other end is a rectangular tenon shape. During blade profile manufacturing, a center hole is often made at the tip of the raw blade material as a process hole to facilitate clamping and subsequent processing on the machine tool platform. To facilitate blade installation and unit operation, the center hole is removed after blade manufacturing. If the blade has gaps, scratches, or other defects that prevent it from meeting process requirements and needs remanufacturing, the removed center hole prevents the elliptical plane end of the blade from being secured by the original fixture, rendering it unusable for secondary processing and necessitating scrapping.

[0030] To achieve the remanufacturing of axial compressor blades, this embodiment considers the existing positioning fixtures for axial compressor blades. However, since the three-dimensional twisted surface of the stationary blade is difficult to fit completely with the fixed fixture, the positioning cannot be stable. Furthermore, when the positioning error is greater than 0.2 mm, it will cause uneven thickness of the laser cladding layer on the blade, which cannot meet the process requirements of axial compressors. At the same time, the rigid clamping of the stationary blade by the mechanical combination fixture of the traditional positioning fixture makes the clamping force easily concentrated on the nickel-based alloy blade, causing microcracks and resulting in secondary damage to the stationary blade.

[0031] To address the aforementioned technical problems, the present invention proposes the following technical solutions and corresponding embodiments.

[0032] Example 1

[0033] The following is combined Figures 1 to 4 The illustrated embodiments describe the technical solution of the present invention:

[0034] Figures 1 to 3 A schematic diagram of an adaptive positioning fixture for remanufacturing axial compressor blades according to an embodiment of this application is shown. As shown in the figure, the adaptive positioning fixture for remanufacturing axial compressor blades according to an embodiment of this application includes: a positioning table, a clamping table 2, and multiple clamping assemblies 3. Wherein:

[0035] The positioning platform includes a first fixing member 11 and a second fixing member 12. The second fixing member 12 is disposed inside the first fixing member 11, and the upper surface of the second fixing member 12 is flush with the upper surface of the first fixing member 11.

[0036] The fixture table 2 has an opening inside, the center of which is coaxial with the center of the second fixing member 12 and with the center of the first fixing member 11.

[0037] Multiple clamping assemblies 3 are disposed on the clamping table 2. Each clamping assembly 3 includes at least one curvature clamping block 31, the curvature of which is adapted to the surface curvature of the target axial compressor blade 4.

[0038] In this embodiment, the target axial compressor blade 4 includes a first positioning reference surface and a second positioning reference surface. When the second fixing member 12 performs positioning processing in the adaptive positioning fixture of this application, its upper surface contacts and adsorbs with the first positioning reference surface, thereby realizing the axial positioning of the axial compressor blade. The second positioning reference surface is connected to the curvature surfaces of multiple curvature clamps 31, thereby limiting the radial displacement during blade remanufacturing.

[0039] In this embodiment, the second fixing member 12 is a vacuum adsorption assembly. This vacuum adsorption assembly includes multiple honeycomb suction units and a vacuum generator connected to the multiple honeycomb suction units. The vacuum generator independently controls each honeycomb suction unit. When the upper surface of a honeycomb suction unit picks up the target axial compressor blade 4, the vacuum generator controls the honeycomb suction unit to open a vacuum, applying an adsorption force to the target axial compressor blade 4, thereby achieving axial fixation. As a feasible implementation, a separate one-way valve is built into the adsorption through-hole of each honeycomb suction unit to prevent vacuum leakage when the first positioning reference surface of the adsorbed blade does not completely cover all honeycomb suction units during blade adsorption. Thus, the uncovered honeycomb suction units close when not in contact with the blade, without affecting the operation of the vacuum adsorption assembly. Exemplarily, the honeycomb suction unit adopts a reinforced structure with a fiber-reinforced layer.

[0040] As one feasible implementation, vacuum suction cups made of elastic materials such as rubber are disposed on the exterior of multiple honeycomb suction units. Exemplarily, the shape of the vacuum suction cups can be customized based on the first positioning reference surface of a conventional axial compressor blade, so that when blades of the corresponding specifications are remanufactured, the vacuum suction cups can be replaced with the corresponding model.

[0041] As one feasible implementation method, the dial of the vacuum suction cup is made of aluminum alloy, carbon fiber, or polymer material.

[0042] In this embodiment, multiple curvature clamps 31 arranged circumferentially along the target axial compressor blade 4 have different curvatures at different positions on the blade. This allows the clamping surfaces of the multiple curvature clamps 31 to completely fit the surface of the stationary blade, achieving radial positioning stability and reducing the internal stress of the blade profile. As a feasible implementation, each clamp assembly includes a clamp fixing seat 33 and a fixing screw 32. In each clamp assembly, the clamp fixing seat 33 is connected to the curvature clamps 31 via the fixing screw 32. The clamp fixing seat 33 is an L-shaped cube with a threaded hole in its base, fixed to the upper surface of the clamping table by screws. The upper end of the L-shaped cube is movably connected to the clamp fixing seat 33 via a helical drive based on the uniform threads on the screw surface. The screw type can be changed depending on the blade specifications.

[0043] In this embodiment, four sets of clamping assemblies 3 are circumferentially arranged on the positioning platform. These four sets of clamping assemblies 3 are distributed in an array at a preset angle, each facing the center point of the clamping platform (i.e., the center of the opening / the center of the second fixing member 12 / the center of the first fixing member 11). For example, the preset angle can be 45°, 60°, or 90°. Here, the selection of the curvature clamping block 31 is determined by the curvature of the corresponding position of the clamped axial compressor blade. In some embodiments, since the width of a large axial compressor blade is several times that of a small axial compressor blade, two to four additional sets of clamps are required to prevent torsional and bending deformation.

[0044] As one feasible implementation, the positioning table and the fixture table are cylindrical, and a rectangular opening is provided in the middle of the fixture table. The width of the rectangular opening is greater than the width of the target axial compressor blade 4, so that the target axial compressor blade 4 can pass through the rectangular opening of the fixture table.

[0045] As a feasible implementation method, the clamping bases 33 are L-shaped, and there are eight of them, used to clamp large axial compressor blades. The clamping assemblies 3 are arranged along both sides of the rectangular opening of the clamping table, facing the center of the circumference of the clamping table. Based on this clamping method, the tip and profile of the axial compressor blade are effectively fixed, which effectively reduces the tensile and torsional stresses on the axial compressor blades caused by processing.

[0046] In this embodiment, a bracket is provided on the positioning platform, and the interior of the bracket has a channel for the target axial compressor blades 4 to pass through. The bracket includes multiple support members 5, each support member 5 being fixed to the edge of the positioning platform by bolts at its bottom, and the top of each support member 5 being connected to the fixture platform through bolt holes. As one possible implementation, see reference... Figure 1 The support member 5 shown can be a tile-shaped block distributed on the outer side of the truncated circle of the positioning platform, and the support member can be a telescopic structure to adapt to different types and models of axial compressor blades.

[0047] In this embodiment of the application, the adaptive positioning fixture is installed on the machining platform of the machine tool by fixing bolts at the bottom of the positioning table, and is used to manufacture pre-formed axial compressor blades.

[0048] Here, the second fixing member 12 can also be one or more magnetic cores, so that the first positioning reference surface can be attracted to the positioning stage by means of the magnetic cores.

[0049] The adaptive positioning fixture for remanufacturing axial compressor blades provided in this application uses a positioning table to adsorb and restrict the axial displacement of the axial compressor blades, achieving axial orientation fixation. Then, in the radial direction, the blades are circumferentially fixed by surface-fitting through a fixture table and multiple fixture components 3 on the fixture table, limiting radial displacement during blade remanufacturing and reducing internal stress on the blade profile. This effectively prevents torsional and bending deformation caused by processing, achieving low-stress clamping and adaptive positioning. Simultaneously, the remanufacturing of already formed axial compressor blades promotes material reuse, explores new ideas for green manufacturing, and minimizes environmental harm and maximizes resource utilization throughout the entire lifecycle of the blades, from design, manufacturing, use to disposal, thus contributing to the coordinated optimization of enterprise economic and social benefits.

[0050] Example 2

[0051] Based on the foregoing embodiments, this application also provides an adaptive positioning method for remanufacturing axial compressor blades, referencing... Figure 4 As shown, the content includes the following steps S401 to S404:

[0052] Step S401: Install the fixing bolts and connect the positioning table to the machine tool processing platform;

[0053] Step S402: The target axial compressor blades pass through the rectangular opening of the fixture table, so that the blade tips fit with the multiple honeycomb suction hole units of the positioning table to open the vacuum adsorption assembly of the machine tool.

[0054] Step S403: Adjust the curvature clamp to make its curvature surface match the blade profile;

[0055] Step S404: Rotate the fixing screw to push the curvature clamping block to fit the blade profile and clamp it.

[0056] In this way, by limiting the axial and radial displacement of the blades through the positioning table on the processing platform, the tip of the axial compressor blade is attached to the table surface, fixing the axial orientation of the blade. Furthermore, by utilizing the feature that the clamping surface of the curvature block on the fixture table completely fits the blade surface, the radial displacement of the blade is limited during remanufacturing, thereby completing the remanufacturing of the axial compressor blade, improving the blade's utilization efficiency and further reducing equipment costs.

[0057] In the several embodiments provided in this application, it should be understood that the disclosed systems, modules, and methods can be implemented in other ways. For example, the module embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between modules or units, and may be electrical, mechanical, or other forms.

[0058] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. This application is not limited to the exact structures described above and illustrated in the accompanying drawings, and it should not be considered that the specific implementation of this application is limited to these descriptions. For those skilled in the art, various changes and modifications made without departing from the concept of this application should be considered to fall within the protection scope of this application.

Claims

1. An adaptive positioning tooling for remanufacturing axial compressor blades, characterized in that, include: The positioning platform includes a first fixing member (11) and a second fixing member (12), the second fixing member (12) is disposed inside the first fixing member (11), and the upper surface of the second fixing member (12) is flush with the upper surface of the first fixing member (11); A fixture table (2) is disposed above the positioning table. It has an opening inside. The center of the opening is coaxial with the center of the second fixing member (12) and coaxial with the center of the first fixing member (11). Multiple clamping assemblies (3) are circumferentially disposed on the clamping table (2). Each clamping assembly (3) includes at least one curvature clamping block (31), the curvature of which is adapted to the surface curvature of the target axial compressor blade (4).

2. The adaptive positioning fixture for remanufacturing axial compressor blades according to claim 1, characterized in that, The target axial compressor blade (4) has at least a first positioning reference surface and a second positioning reference surface; During positioning, the first positioning reference surface is connected to the upper surface of the second fixing member (12), and the second positioning reference surface is connected to the curvature surface of the curvature clamp (31).

3. The adaptive positioning fixture for remanufacturing axial compressor blades according to claim 2, characterized in that, The second fixing member (12) is a vacuum adsorption assembly, which includes a vacuum generator and multiple honeycomb suction hole units connected to the vacuum generator: Each of the honeycomb suction units is configured to be independently controlled, and the multiple honeycomb suction units apply axial force to the target axial compressor blade (4) based on the first positioning reference.

4. The adaptive positioning fixture for remanufacturing axial compressor blades according to claim 3, characterized in that, The vacuum adsorption component is a vacuum suction cup, and the dial of the vacuum suction cup is made of aluminum alloy, carbon fiber, or polymer material.

5. The adaptive positioning fixture for remanufacturing axial compressor blades according to claim 2, characterized in that, The second fastener (12) is one or more magnet cores.

6. The adaptive positioning fixture for remanufacturing axial compressor blades according to claim 1, characterized in that, The plurality of clamping assemblies (3) are distributed around the clamping table (2) at a preset angle; The clamp assembly also includes a clamp fixing seat (33) and a fixing screw (32); the clamp fixing seat (33) is connected to the curvature clamp block (31) through the fixing screw (32), wherein the clamp fixing seat (33) is L-shaped and its base is fixed to the upper surface of the clamp table (2).

7. The adaptive positioning fixture for remanufacturing axial compressor blades according to claim 1, characterized in that, A bracket is provided on the positioning platform, and the inside of the bracket is provided with a channel for the target axial compressor blade (4) to pass through.

8. The adaptive positioning fixture for remanufacturing axial compressor blades according to claim 7, characterized in that, The bracket includes multiple support members (5), each of which is bolted to the edge of the positioning platform.

9. The adaptive positioning fixture for remanufacturing axial compressor blades according to claim 8, characterized in that, The support member (5) is a telescopic rod.

10. The adaptive positioning fixture for remanufacturing axial compressor blades according to any one of claims 1-9, characterized in that, The positioning table is bolted to any machining platform.

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