Guide vane shroud machining jig and method

Abstract

The application discloses a guide vane rim plate machining clamp and a machining method, and belongs to the technical field of aero-engines. The guide vane rim plate machining clamp comprises a base plate, a positioning box, a pressing assembly and a positioning assembly. The positioning box is installed on the base plate, the positioning box is provided with a pouring cavity in the inside, and the guide vane is positioned and fixed in the pouring cavity. The pressing assembly is arranged on the base plate, and is used for pressing and limiting the positioning box. The positioning assembly is used for limiting the guide vane, and comprises a positioning block assembly fixed in the positioning box and a positioning pin assembly arranged outside the positioning box. The positioning block assembly is used for abutting against the profile of the guide vane and clamping the guide vane, and the positioning pin assembly is used for pressing the guide vane and locking the guide vane in cooperation with the positioning block assembly. The application changes the traditional complex six-point positioning mode of the blade body, converts the regular surface positioning through the reversible positioning box, effectively improves the positioning accuracy, is convenient to clamp, and can provide a larger machining operation space for the blade.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and in particular, to a guide vane rim machining fixture. Furthermore, this invention also relates to a method for machining guide vane rims including the aforementioned guide vane rim machining fixture. Background Technology

[0002] Guide vanes are one of the core components of aero engines. Their curved shape and manufacturing precision directly determine the propulsion efficiency of the aircraft engine. In addition, the blade shape is complex and irregular. For various precision-cast blades, the main machining workload is concentrated on the flange and tenon. At the same time, with the production tasks increasing year by year, stabilizing machining quality and improving production efficiency has become the top priority.

[0003] The following technical problems exist in the machining process of the guide vane rim plate:

[0004] (1) The blade profile is irregular. How to improve its positioning accuracy and stability to improve machining precision?

[0005] (2) Due to the small size of the blades, it is difficult to clamp the blades directly, resulting in a small operating space for the clamps and difficult operation. Summary of the Invention

[0006] The purpose of this invention is to address the above problems by providing a guide blade edge plate machining fixture. This fixture changes the traditional, complex six-point positioning method of the blade body by using a positioning box to convert it into a regular surface positioning method, thereby effectively improving positioning accuracy. At the same time, the positioning box is used as a positioning reference for subsequent machining, reducing the problem of pressure damage that is easily caused by blade positioning. The positioning box is not only easy to clamp, but also provides a larger machining operation space for the blade.

[0007] In addition, the present invention also provides a machining method involving the above-mentioned guide vane edge plate machining fixture, which can effectively improve machining quality and machining efficiency.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is: a guide vane rim plate processing fixture for clamping guide vanes of aero engines, the guide vane rim plate processing fixture comprising a base plate, a positioning box, a clamping assembly, and a positioning assembly.

[0009] The positioning box is mounted on the base plate. The outer periphery of the positioning box is provided with a positioning reference for clamping and positioning on a machine tool. The positioning box is provided with a casting cavity. The casting cavity is used to load guide blades and cast fusible alloy on the outer periphery of a portion of the guide blades, so as to prepare a positioning block on the outer periphery of the guide blades by means of fusible alloy, and to position and fix the guide blades in the casting cavity by means of the positioning block.

[0010] The clamping assembly is disposed on the base plate, and the clamping assembly is used to clamp and limit the positioning box.

[0011] The positioning component is used to limit the guide vane. The positioning component includes a positioning block component fixedly disposed in the positioning box and a positioning pin component disposed outside the positioning box. The positioning block component is used to abut against the profile of the guide vane and lock the guide vane in place. The positioning pin component is used to press the guide vane and cooperate with the positioning block component to lock the guide vane.

[0012] Furthermore, the positioning box includes a positioning box body and a first movable cover plate and a second movable cover plate detachably connected to the positioning box body. The positioning box body has an opening communicating with the casting cavity. The first movable cover plate and the second movable cover plate are respectively disposed on opposite sides of the opening and together with the positioning box body to form the casting cavity. The first movable cover plate and the second movable cover plate are both used to be removed relative to the positioning box body after the positioning block is formed, thereby making room for the guide blade to feed.

[0013] Furthermore, mounting platforms are provided on both sides of the positioning box body, and bolts are provided through the mounting platforms. The bolts cooperate with the pre-set screw holes on the base plate to fix the mounting platforms and the positioning box body as a whole on the base plate.

[0014] Furthermore, the positioning block assembly includes positioning block A1 and positioning block B5. Positioning block A1 is disposed on the bottom plate of the positioning box body. Positioning blocks A2 and A3 are disposed on the side wall of positioning block A1. Positioning block B5 is disposed on the baffle at the rear of the positioning box body. Positioning block B5 is disposed on positioning block B4. Positioning blocks A1, A2, A3, B4 and B5 are respectively used to abut against different surfaces of the guide vane and limit the guide vane.

[0015] Furthermore, the positioning pin assembly includes a third support disposed on the substrate, a support plate hinged to the third support, and a C6 positioning pin provided at the movable end of the support plate, the C6 positioning pin being used to press and lock the guide blade.

[0016] Furthermore, a fastener is provided through the support plate, which engages with a pre-set screw hole on the third support and is used to fasten the support plate to the third support.

[0017] Furthermore, the clamping assembly includes a first support and a second support mounted on the substrate. The first support and the second support are respectively disposed on opposite sides of the positioning box and are used to clamp and fix the positioning box to each other. The first support is also provided with a pressing assembly for pressing the positioning box onto the substrate.

[0018] Furthermore, the pressing assembly includes a pressure plate hinged to the first support, a first clamping screw passing through the pressure plate, the first clamping screw being used to press the positioning box against the substrate in the direction toward the substrate and press the positioning box against the substrate. A second clamping screw passing through the bottom of the second support is used to press the positioning box against the first support in the direction toward the first support and press the positioning box against the first support. A second pressure plate is hinged to the second support, a long screw passing through the second pressure plate, the long screw being arranged in the direction toward the substrate and having a pressure block connected to its end, the pressure block being used to press the guide blade.

[0019] Furthermore, the substrate is provided with a positioning ball for use as a measurement reference, and a positioning seat for positioning the positioning box in the horizontal and vertical directions.

[0020] In addition, the present invention also discloses a processing method using the above-mentioned guide vane edge plate processing fixture, comprising the following steps:

[0021] S100, Install the positioning box: Fix the positioning box on the base plate and use the clamping assembly to clamp and limit the positioning box;

[0022] S200, Clamping the guide vane: The guide vane is partially limited by the positioning block assembly inside the positioning box, and the guide vane is pressed and fixed by the flip-out positioning pin outside the positioning box.

[0023] S300, Casting soluble alloy: Casting soluble alloy into the positioning box to fix the blade;

[0024] S400, Disassemble the positioning box: Remove the first and second movable cover plates on the top of the detachable positioning box before the soluble alloy has completely cooled to avoid interference when machining the guide blade edge plate;

[0025] S500, Positioning box transferred to machining process: The positioning box with the soluble alloy poured in it and the guide blade are transferred as a whole to the machining process for machining the guide blade edge plate. During the machining process, the position of the guide blade is adjusted by reversing the clamping of the positioning box.

[0026] S600, disassembling and assembling guide vanes: After the guide vane edge plate is processed, dissolve the soluble alloy to remove the guide vane.

[0027] The beneficial effects of this invention are:

[0028] When machining guide vanes, which lack a clamping and positioning reference, traditional methods include precision positioning using low-melting-point alloy casting. This involves using an alloy positioning block to position the vane, transferring the positioning reference from the blank vane itself to the alloy positioning body. Specifically, a low-melting-point alloy is cast in a casting fixture. After cooling and solidifying, an alloy block is obtained, which is then used for subsequent machining. The casting of the low-melting-point alloy block and the fixture process is the first critical step in machining, and there are issues with the accuracy and stability of the positioning between the cast alloy block and the vane. Furthermore, the special shape of the alloy block makes it difficult to detach it from the casting fixture after cooling, resulting in inconvenient operation. This invention addresses these issues with the following improvements:

[0029] The positioning box is used for casting easily soluble alloys. The cast alloy serves as the medium for fixing the blade to the positioning box, which then acts as the positioning reference for subsequent machining. This transforms the previous complex six-point positioning of the blade body into regular surface positioning. It also shifts the positioning method from using alloy blocks for positioning and subsequent machining to using the cast alloy as the medium for fixing the blade to the positioning box, which then serves as the positioning reference for subsequent machining. This not only solves the problem of alloy blocks being unable to be removed from the casting fixture, but also ensures that the shape and size of the casting window in the positioning box do not interfere with the two sides of the blade to be machined, and maximizes the casting area to ensure the stability of the blade positioning. Furthermore, using the positioning box to position smaller blades provides more operating space, facilitating machining and measurement operations.

[0030] Of course, any product implementing this invention does not necessarily need to achieve all the advantages described above simultaneously. In addition to the objectives, features, and advantages described above, this invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the installation of the positioning box body according to a preferred embodiment of the present invention.

[0034] Figure 3 This is a schematic diagram of the installation of the first support in a preferred embodiment of the present invention.

[0035] Figure 4This is a schematic diagram of the installation of the positioning block assembly according to a preferred embodiment of the present invention.

[0036] Figure 5 This is a schematic diagram of the installation of the positioning seat according to a preferred embodiment of the present invention.

[0037] Figure 6 This is a schematic diagram of the positioning box according to a preferred embodiment of the present invention.

[0038] Figure 7 This is a schematic diagram of the installation of the second movable cover plate according to a preferred embodiment of the present invention.

[0039] Figure 8 This is a schematic diagram of the positioning box according to a preferred embodiment of the present invention.

[0040] Figure 9 This is a schematic diagram of the positioning component according to a preferred embodiment of the present invention.

[0041] Figure 10 This is a schematic diagram of the positioning block assembly according to a preferred embodiment of the present invention.

[0042] Figure 11 This is a schematic diagram of the clamping state of the guide vane according to a preferred embodiment of the present invention.

[0043] Legend: 1. Positioning ball; 2. Base plate; 3. Positioning seat; 4. First support; 5. Pressure plate; 6. First movable cover plate; 7. Rear baffle; 8. Positioning box body; 9. Mounting platform; 10. Second movable cover plate; 11. Second support; 12. Third support; 13. Pull rod; 14. Positioning assembly; 15. Pressure block; 16. Second pressure plate; 17. First clamping screw; 18. Second clamping screw; 19. A2 positioning block; 20. B4 positioning block; 21. Support plate; 22. B5 positioning block; 23. A1 positioning block; 24. A3 positioning block; 25. C6 positioning pin; 26. Rectangular head screw. Detailed Implementation

[0044] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0045] A guide vane rim plate machining fixture is used to clamp guide vanes of an aero-engine. The guide vane rim plate machining fixture includes a base plate 2, a positioning box, a clamping assembly, and a positioning assembly 14.

[0046] The positioning box is mounted on the base plate 2. The outer periphery of the positioning box is provided with a positioning reference for clamping and positioning on a machine tool. The positioning box is provided with a casting cavity. The casting cavity is used to load guide blades and cast fusible alloy on the outer periphery of a portion of the guide blades, so as to prepare a positioning block on the outer periphery of the guide blades by means of fusible alloy, and to position and fix the guide blades in the casting cavity by means of the positioning block.

[0047] The clamping assembly is disposed on the base plate 2, and the clamping assembly is used to clamp and limit the positioning box;

[0048] The positioning component 14 is used to limit the guide vane. The positioning component 14 includes a positioning block component fixedly disposed in the positioning box and a positioning pin component disposed outside the positioning box. The positioning block component is used to abut against the profile of the guide vane and lock the guide vane in place. The positioning pin component is used to press the guide vane and cooperate with the positioning block component to lock the guide vane.

[0049] This invention employs a positioning box to cast easily soluble alloys, allowing the cast alloy to serve as the medium for fixing the guide blades and the positioning box. The positioning box then acts as a positioning reference for subsequent machining. This transforms the previous complex six-point positioning of the blade body into regular surface positioning, and shifts the positioning method from using alloy blocks for positioning and subsequent machining to using the cast alloy as the medium for fixing the blades and the positioning box as the positioning reference for subsequent machining. This not only solves the problem of alloy blocks being unable to be removed from the casting fixture, but also ensures that the shape and size of the casting window in the positioning box do not interfere with the two sides of the blade to be machined, while maximizing the casting area to ensure the stability of the blade positioning.

[0050] This invention uses a clamping and positioning box to position small blades, providing a larger operating space and facilitating processing and measurement. It solves the problem that because the blades are small, it is difficult to ensure stability using six-point positioning and to meet the processing requirements of the blade in two directions. It also solves the problems of traditional casting fixtures requiring six positioning pins to be included in the casting of low-melting-point alloy blocks, resulting in limited operating space and difficult operation.

[0051] Preferably, please refer to Figure 1 , 6As shown in Figures 7 and 8, the positioning box includes a positioning box body 8 and a first movable cover plate 6 and a second movable cover plate 10 that are detachably connected to the positioning box body 8. The positioning box body 8 has an opening that communicates with the casting cavity. The first movable cover plate 6 and the second movable cover plate 10 are respectively disposed on opposite sides of the opening and together with the positioning box body 8 to form the casting cavity. The first movable cover plate 6 and the second movable cover plate 10 are both used to be removed relative to the positioning box body 8 after the positioning block is formed, thereby making room for the guide blade to feed.

[0052] It is understandable that by combining the positioning box body 8, the first movable cover plate 6, the rear baffle plate 7, and the second movable cover plate 10 into a detachable positioning box, an easily soluble alloy is poured into the casting cavity inside the positioning box. The poured alloy serves as a medium to fix the blades to the positioning box, allowing the positioning box to serve as a positioning reference for subsequent processing. This facilitates the reversal of the positioning box and the blades as a whole, making processing operations easier. It also solves the problem that irregularly shaped alloys cannot be removed from the square box when using low-melting-point alloys as processing references in the traditional method.

[0053] The shape and size of the positioning box pouring window ensure that the two sides of the flange to be processed are not interfered with and that the pouring area is maximized to ensure the stability of the blade positioning, while providing more space for processing operations.

[0054] It should be noted that the first movable cover plate 6 and the second movable cover plate 10 should be removed from the positioning box body 8 before the poured soluble alloy has completely cooled, in order to avoid interference during the subsequent processing of the double side edge plates.

[0055] In addition, the positioning box body 8 is designed with process reference holes to facilitate measurement and clamping in subsequent machining.

[0056] Preferably, please refer to Figure 1 , 6 As shown in Figures 7 and 8, mounting platforms 9 are provided on both sides of the positioning box body 8. Bolts are installed through the mounting platforms 9, and the bolts cooperate with the pre-set screw holes on the base plate 2 to fix the mounting platforms 9 and the positioning box body 8 as a whole on the base plate 2. In addition, detachable pull rods 13 are provided on the side walls of the positioning box body 8, the first movable cover plate 6, and the second movable cover plate 10.

[0057] It is understandable that the pull rod 13 can be a threaded rod for easy disassembly and assembly. The pull rod 13 can be used to lift, transport, and disassemble various components. It should be noted that, because angle pads need to be added to the fixture or the angle of the entire device needs to be adjusted to keep the casting window of the positioning box horizontal when casting fusible alloys, mounting platforms 9 are set on both sides of the positioning box body 8 to facilitate the adjustment and assembly of the positioning box body 8.

[0058] Preferably, please refer to Figure 2 ,9 As shown in Figure 10, the positioning block assembly includes positioning block A1 23 and positioning block B5 22. Positioning block A1 23 is disposed on the bottom plate of the positioning box body 8. Positioning block A2 19 and positioning block A3 24 are disposed on the side wall of positioning block A1 23. Positioning block B5 22 is disposed on the baffle at the rear of the positioning box body 8. Positioning block B5 22 is disposed on positioning block B4 20. Positioning blocks A1 23, A2 19, A3 24, B4 20, and B5 22 are respectively used to abut against different surfaces of the guide vane and limit the guide vane. The baffle at the rear of the positioning box body 8 is a rear baffle 7, which is bolted to the rear of the positioning box body 8.

[0059] Understandably, the positioning block assembly inside the positioning box enables five-point positioning of the irregularly shaped guide vane, which can limit the vane locally after it is clamped. However, the vane is not completely locked at this time and can still be disassembled or its position adjusted. With the help of the flip-out positioning pin and the pressure block 15, the vane can be locked and fixed.

[0060] Preferably, please refer to Figure 2 , 9 As shown in Figure 10, the positioning pin assembly includes a third support 12 disposed on the base plate 2, a support plate 21 is hinged to the third support 12, and a C6 positioning pin 25 is provided at the movable end of the support plate 21. The C6 positioning pin 25 is used to press and lock the guide blade.

[0061] Understandably, after the blade is partially limited by the positioning block assembly, it is finally locked and fixed by rotating the reversible positioning pin. The positioning block assembly and the reversible positioning pin can lock the blade onto three different sides, and finally, the pressure block 15 can press down to further secure the blade. Because both the C6 positioning pin 25 and the pressure block 15 are detachable movable parts, a large amount of space can be adjusted during blade installation and removal, providing greater operating space and facilitating operation.

[0062] Preferably, please refer to Figure 5 As shown, a fastener is provided through the support plate 21. The fastener cooperates with the pre-set screw hole on the third support 12 and is used to fasten the support plate 21 and the third support 12.

[0063] Understandably, the hinged support plate 21 can be rotated, while the fasteners can restrict and fix the position of the support plate 21. The fasteners can be rectangular head screws 26 or wing bolts, which are convenient for manual tightening.

[0064] Preferably, please refer to Figure 1 , 2As shown in Figures 3, 4, and 5, the clamping assembly includes a first support 4 and a second support 11 mounted on the base plate 2. The first support 4 and the second support 11 are respectively disposed on opposite sides of the positioning box and are used to clamp and fix the positioning box to each other. The first support 4 is also provided with a pressing component for pressing the positioning box onto the base plate 2.

[0065] Specifically, the pressing assembly includes a pressure plate 5 hinged to the first support 4. A first clamping screw 17 is provided through the pressure plate 5. The first clamping screw 17 is used to press the positioning box against the base plate 2 in the direction toward the base plate 2 and press the positioning box against the base plate 2. A second clamping screw 18 is provided through the bottom of the second support 11. The second clamping screw 18 is used to press the positioning box against the first support 4 in the direction toward the first support 4 and press the positioning box against the first support 4. A second pressure plate 16 is hinged to the second support 11. A long screw is provided through the second pressure plate 16. The long screw is provided in the direction toward the base plate 2 and has a pressure block 15 connected to its end. The pressure block 15 is used to press the guide blade.

[0066] Understandably, the first clamping screw 17 clamps and limits the top of the positioning box, the second clamping screw 18 clamps and limits the front of the positioning box, and the first support 4 also limits the rear baffle 7, thus limiting the back of the positioning box. In addition, the positioning box body 8 is fixedly installed on the base plate 2 by the mounting platform 9 and bolts, thereby achieving multi-directional limiting and fixing of the positioning box as a whole, ensuring the positioning accuracy of the positioning box.

[0067] Preferably, please refer to Figure 1 and Figure 5 As shown, the base plate 2 is provided with a positioning ball 1 used as a measurement reference, and a positioning seat 3 used to position the positioning box in the horizontal and vertical directions.

[0068] Understandably, since the blades need to be flipped during processing, the fixture needs interchangeable positioning references. Therefore, process holes are designed on the main body 8 of the positioning box as processing measurement references. The positioning ball 1 can be used to ensure the measurement of each positioning point, and the positioning seat 3 is used to position the main body 8 of the positioning box to ensure its positioning in the horizontal and vertical directions. Multiple measures improve the overall positioning accuracy of the positioning box, thereby improving the accuracy and quality of processing.

[0069] In addition, the present invention also discloses a method for machining guide vane rim plates using the above-mentioned guide vane rim plate machining fixture, comprising the following steps:

[0070] S100, Install the positioning box: Fix the positioning box on the base plate 2, and use the clamping assembly to clamp and limit the positioning box;

[0071] S200, Clamping the guide vane: The guide vane is partially limited by the positioning block assembly inside the positioning box, and the guide vane is pressed and fixed by the flip-out positioning pin outside the positioning box.

[0072] S300, Casting soluble alloy: Casting soluble alloy into the positioning box to fix the blade;

[0073] S400, Disassemble the positioning box: Before the soluble alloy has completely cooled, disassemble the first movable cover plate 6 and the second movable cover plate 10 on the top of the detachable positioning box to avoid interference when machining the guide blade edge plate; S500, Transfer the positioning box to the machining process: Transfer the positioning box with the soluble alloy and the guide blade as a whole to the machining process for machining the guide blade edge plate. During the machining process, the position of the guide blade is adjusted by reversing the clamping of the positioning box;

[0074] S600, disassembling and assembling guide vanes: After the guide vane edge plate is processed, dissolve the soluble alloy to remove the guide vane.

[0075] It is understandable that in step S400, disassembling the first movable cover plate 6 and the second movable cover plate 10 before the soluble alloy has completely cooled can avoid interference when machining the double side edge plates in the subsequent process, provide a larger machining operation space, facilitate the disassembly and assembly of the positioning box body 8, reduce the overall weight of the positioning box, and facilitate transportation.

[0076] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0077] This document describes the principles and implementation methods of the present invention. The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A guide vane rim plate machining fixture for clamping guide vanes of aero engines, characterized in that, The guide vane edge plate processing fixture includes a base plate (2), a positioning box, a clamping assembly and a positioning assembly (14). The positioning box is mounted on the base plate (2). The outer periphery of the positioning box is provided with a positioning reference for clamping and positioning on a processing machine tool. The positioning box is provided with a casting cavity. The casting cavity is used to load the guide blade and cast a fusible alloy on the outer periphery of a portion of the guide blade. The fusible alloy is used to prepare a positioning block on the outer periphery of the guide blade and the positioning block is used to position and fix the guide blade in the casting cavity. The clamping assembly is disposed on the base plate (2), and the clamping assembly is used to clamp and limit the positioning box; The positioning component (14) is used to limit the guide vane. The positioning component (14) includes a positioning block component fixedly disposed in the positioning box and a positioning pin component disposed outside the positioning box. The positioning block component is used to abut against the surface of the guide vane and lock the guide vane. The positioning pin component is used to press the guide vane and cooperate with the positioning block component to lock the guide vane. The positioning box includes a positioning box body (8) and a first movable cover plate (6) and a second movable cover plate (10) detachably connected to the positioning box body (8). The positioning box body (8) is provided with an opening communicating with the casting cavity. The first movable cover plate (6) and the second movable cover plate (10) are disposed on opposite sides of the opening and together with the positioning box body (8) to form the casting cavity. The first movable cover plate (6) and the second movable cover plate (10) are both used to be removed relative to the positioning box body (8) after the positioning block is formed, thereby making room for the guide vane to enter the cutting space.

2. The guide vane rim plate machining fixture according to claim 1, characterized in that, The positioning box body (8) is provided with mounting platforms (9) on both sides. Bolts are provided through the mounting platforms (9). The bolts cooperate with the pre-set screw holes on the base plate (2) to fix the mounting platforms (9) and the positioning box body (8) as a whole on the base plate (2).

3. The guide vane rim plate machining fixture according to claim 1, characterized in that, The positioning block assembly includes an A1 positioning block (23) and a B5 positioning block (22). The A1 positioning block (23) is located on the bottom plate of the positioning box body (8). The A2 positioning block (19) and the A3 positioning block (24) are located on the side wall of the A1 positioning block (23). The B5 positioning block (22) is located on the baffle at the rear of the positioning box body (8). The B5 positioning block (22) is located on the B4 positioning block (20). The A1 positioning block (23), A2 positioning block (19), A3 positioning block (24), B4 positioning block (20) and B5 positioning block (22) are respectively used to abut against different surfaces of the guide vane and limit the guide vane.

4. The guide vane rim plate machining fixture according to claim 3, characterized in that, The positioning pin assembly includes a third support (12) disposed on the base plate (2), a support plate (21) is hinged on the third support (12), and a C6 positioning pin (25) is provided on the movable end of the support plate (21). The C6 positioning pin (25) is used to press and lock the guide blade.

5. The guide vane rim plate machining fixture according to claim 4, characterized in that, Fasteners are provided through the support plate (21), and the fasteners cooperate with the pre-set screw holes on the third support (12) to fasten the support plate (21) and the third support (12).

6. The guide vane rim plate machining fixture according to claim 1, characterized in that, The clamping assembly includes a first support (4) and a second support (11) mounted on the base plate (2). The first support (4) and the second support (11) are respectively located on opposite sides of the positioning box and are used to clamp and fix the positioning box to each other. The first support (4) is also provided with a pressing assembly for pressing the positioning box onto the base plate (2).

7. The guide vane rim plate machining fixture according to claim 6, characterized in that, The pressing assembly includes a pressure plate (5) hinged to the first support (4). A first clamping screw (17) is provided through the pressure plate (5). The first clamping screw (17) is used to press the positioning box against the substrate (2) in the direction toward the substrate (2) and press the positioning box against the substrate (2). A second clamping screw (18) is provided through the bottom of the second support (11). The second clamping screw (18) is used to press the positioning box against the first support (4) in the direction toward the first support (4) and press the positioning box against the first support (4). A second pressure plate (16) is hinged to the second support (11). A long screw is provided through the second pressure plate (16). The long screw is provided in the direction toward the substrate (2) and a pressure block (15) is connected to its end. The pressure block (15) is used to press the guide blade.

8. The guide vane rim plate machining fixture according to claim 1, characterized in that, The base plate (2) is provided with a positioning ball (1) used as a measurement reference and a positioning seat (3) used to position the positioning box in the horizontal and vertical directions.

9. A method for processing guide vane rim plates, characterized in that, Using the guide vane rim plate machining fixture as described in any one of claims 1-8, the guide vane rim plate machining method includes the following steps: S100, Install the positioning box: Fix the positioning box on the base plate (2) and press and limit the positioning box by the pressing assembly; S200, Clamping the guide vane: The guide vane is partially limited by the positioning block assembly inside the positioning box, and the guide vane is pressed and fixed by the flip-out positioning pin outside the positioning box. S300, Casting soluble alloy: Casting soluble alloy into the positioning box to fix the blade; S400, Disassemble the positioning box: Before the soluble alloy is completely cooled, remove the first movable cover plate (6) and the second movable cover plate (10) on the top of the detachable positioning box to avoid interference when machining the guide blade edge plate; S500, Positioning box transferred to machining process: The positioning box with the soluble alloy poured in it and the guide blade are transferred as a whole to the machining process for machining the guide blade edge plate. During the machining process, the position of the guide blade is adjusted by reversing the clamping of the positioning box. S600, disassembling and assembling guide vanes: After the guide vane edge plate is processed, dissolve the soluble alloy to remove the guide vane.

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