Linear cutting machining method for stator blade and clamping device

Abstract

The invention discloses a stator blade machining method and a clamping device, and belongs to the technical field of machining and manufacturing of aero-engine stator blades. The machining method comprises the following steps that S1, a workpiece is clamped; s2, partial cutting; s3, measuring the size; s4, path correction; and S5, complete cutting. According to the method, only the process bosses at the two ends of the blade are partially cut by using a first wire feeding program, and the incompletely cut-off connecting part at one end or two ends is reserved while the blade body is completely reserved, so that the blade is still kept associated with the positioning journal in a clamping state to form a'test piece 'with a reference standard; therefore, when the measurement operation approaches the finished product state, accurate evaluation is carried out by taking the positioning shaft neck as the measurement basis, and the consistency of the measurement result and the subsequent finished product state is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of the processing and manufacturing of stator blades of aero-engines, and particularly to a wire cutting processing method and a clamping device for stator blades. Background Art

[0002] The stator blade of an aero-engine is a stationary blade in the compressor or turbine of the engine. Its main functions are to guide the air flow direction, rectify the flow, improve the efficiency or change the air flow angle so that the moving blades can do work more effectively. The stator blade is not a simple straight blade. It is a three-dimensional curved surface structure with an aerodynamic shape. Therefore, the profile of the blade needs to be precision milled. For the clamping and positioning during precision milling, process bosses are reserved at both the front and rear ends of the blade. A positioning journal is provided on one of the process bosses, and a tail journal is provided on the other process boss. After precision milling, the process bosses and the positioning journal need to be cut off by wire cutting. When using the conventional process for wire cutting, since the process bosses at both ends of the blade are cut off after wire cutting, and the blade itself is also a three-dimensional curved surface structure, it is difficult to measure whether the dimensions are qualified. Summary of the Invention

[0003] The present invention provides a wire cutting processing method and a clamping device for stator blades to solve the technical problem that it is difficult to measure whether the dimensions are qualified during the wire cutting process of the process bosses and the positioning journal after the precision milling of the stator blades.

[0004] According to one aspect of the present invention, a wire cutting processing method for stator blades is provided, including the following steps: S1, workpiece clamping, fixing the semi-finished stator blade to be processed on the wire cutting clamping device for stator blades, and adjusting the angle and position of the stator blade in space according to a predetermined processing reference, and the clamping position is the positioning journal of the semi-finished stator blade;

[0005] S2, partial cutting, using the first wire walking program, starting from the initial reference position of the machine tool, partially cutting the process boss area of the semi-finished stator blade, and keeping an uncompletely cut connection part between the blade and the process boss;

[0006] S3, dimension measurement, using the process boss and the positioning journal as the measurement reference, measuring the dimension data of the stator blade after partial cutting, and judging whether it meets the predetermined tolerance range according to the measurement result;

[0007] S4, path correction, if the measurement result does not meet the tolerance requirement, correcting the first wire walking program, and steps S2 and S3 can be repeated; if the measurement result meets the tolerance requirement, proceed to the next step;

[0008] S5. Full cutting: Using the second wire walking program, the process boss of the stator blade is finally cut to form a finished blade without a boss. In the first wire walking program and the second wire walking program, the paths for dividing the process boss and the stator blade coincide.

[0009] Optionally, in the first wire walking program, the path where the cutting wire exits the part and the path where the cutting wire enters the part are offset, so as to form a groove for detection between the process boss and the stator blade. The surface of the groove close to the stator blade side is the surface to be measured.

[0010] Optionally, in step S2, partial cutting is performed at both ends of the stator blade, so that grooves are formed at both ends of the stator blade.

[0011] Optionally, in the second wire walking program, the cutting wire starts from the same initial reference as the first wire walking program, passes through the end far from the positioning journal, completely cuts off the process boss at the end far from the positioning journal, and then the cutting wire cuts off the process boss from the end close to the positioning journal, so that the stator blade is completely separated from the process boss. After completely cutting off the part, the cutting wire returns to the initial reference position.

[0012] Optionally, in step S5, a blade body supporting component is provided at the wire cutting station. The blade body supporting component is located below the stator blade. When the stator blade is completely separated from the process boss, the blade body supporting component supports the stator blade to prevent the stator blade from falling.

[0013] According to another aspect of the present invention, a wire cutting clamping device for a stator blade is further provided, which includes a bottom plate for connecting to a wire cutting machine tool and providing a reference surface for tool setting;

[0014] An elastic positioning component, including a mounting seat and an elastic positioning shaft arranged on the mounting seat. The elastic positioning shaft has an elastic chuck for clamping the positioning journal of the stator blade to achieve axial center positioning of the positioning journal, and the end face of the elastic chuck is used to abut against the end face of the process boss of the stator blade to achieve axial positioning of the positioning journal;

[0015] An angular positioning component is arranged on the mounting seat and is used to cooperate with the positioning surface on the positioning journal to achieve angular positioning of the positioning journal.

[0016] Optionally, it further includes a tail journal tightening component, and the tail journal tightening component includes a supporting plate and a supporting board;

[0017] The supporting board is fixed on the bottom plate and is used to support the supporting plate. A hole for cooperating with the tail journal of the semi-finished stator blade is provided on the supporting plate.

[0018] Optionally, a chute is axially formed in the strut along the tail journal, and the support plate is slidably mounted in the chute of the strut so that the support plate can be moved closer to or away from the tail journal by sliding the support plate along the chute.

[0019] Optionally, it further includes a blade body supporting assembly detachably connected to the bottom plate. The blade body supporting assembly includes a blade body tightening seat and a blade body stop pin. The inclination angle of the upper surface of the blade body tightening seat matches the inclination angle of the stator blade profile, so as to support the blade body part of the stator blade. The blade body stop pin is arranged on the lower side of the blade body tightening seat to prevent the stator blade from slipping off the blade body tightening seat.

[0020] Optionally, the angular positioning assembly includes an angular block and an adjusting screw. The angular block is slidably engaged with the mounting seat, and the adjusting screw is threadedly connected to the mounting seat. By rotating the adjusting screw, the angular block can be pushed to move so that the angular block abuts against the positioning surface of the positioning journal.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] In traditional machining, after the process boss of the stator blade is removed in one go, since the blade body has been completely separated from the front and rear journals, it is impossible to rely on the original clamping reference for re-measurement. As a result, the dimensional evaluation can only rely on speculation before machining or the theoretical values of the program, and it is impossible to verify the positional error between the actual blade body and the axis. There is a risk of inaccurate measurement and unstable data. To address this problem, this method only partially cuts the process bosses at both ends of the blade using the first wire cutting program. While ensuring the integrity of the blade body is retained, one or both ends of the incompletely cut connection parts are retained, so that the blade still maintains its association with the positioning journal in the clamped state, forming a "test piece" with a reference benchmark. Thus, the measurement operation can be carried out while approaching the finished product state, and accurate evaluation can be performed with the positioning journal as the measurement benchmark, ensuring that the measurement results are consistent with the subsequent finished product state. Subsequently, the dimensions of the test piece are collected by precise instruments, and the relative positional relationship between the blade body of the blade and the process boss can be accurately quantified. Based on this data, it can be determined whether the product tolerance requirements are met. If a deviation is found, the first program path can be fine-tuned and the test cutting and measurement can be re-executed until the dimensions are confirmed to be qualified. Thus, when the final complete cutting is achieved in the second wire cutting program, it can be ensured that the path of separating the blade body from the process boss completely coincides with the verified test path, achieving consistency between prediction and reality, and improving the qualified rate and controllability of the finished product dimensions.

[0023] In addition to the purposes, features, and advantages described above, the present invention has other purposes, features, and advantages. The present invention will be further described in detail below with reference to the drawings. Description of the Drawings

[0024] The accompanying drawings, which form a part of this application, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 is a schematic structural diagram of the wire cutting clamping device for the stator blade of the present invention;

[0026] Figure 2 is Figure 1 a sectional view along M-M;

[0027] Figure 3 is Figure 1 a side view of

[0028] Figure 4 is a schematic diagram of the path of the first wire walking program;

[0029] Figure 5 is a schematic diagram of the path of the second wire walking program.

[0030] Legend description:

[0031] 1. Base plate; 2. Mounting seat; 3. Elastic positioning shaft; 4. Outer end nut; 5. Angular block; 6. Adjusting screw; 7. Cover plate; 8. Support plate; 9. Support plate; 10. Pulling plate; 11. Blade body stop pin; 12. Blade body tightening seat. Detailed implementation manners

[0032] The following will describe in detail the embodiments of the present invention with reference to the accompanying drawings. However, the present invention can be implemented in many different ways defined and covered by the following.

[0033] The following will describe Figures 1-5 the present application in further detail.

[0034] The embodiments of the present application disclose a wire cutting processing method and a clamping device for stator blades.

[0035] Referring to Figure 1 , the wire cutting clamping device for stator blades is used for precise positioning and stable clamping of blades during the wire cutting processing of stator blades of aeroengines, meeting the high-precision clamping requirements for the angles and positions of blades under different wire walking paths. It includes a base plate 1, an elastic positioning shaft 3, an angular positioning component, and a tail journal tightening component. Among them, the base plate 1 provides an installation reference for the whole system and is fixed to the machine tool. The elastic positioning shaft 3 realizes the clamping and axial positioning of the blade main journal through an elastic chuck method. The angular positioning component precisely controls the angular position of the blade around the journal, and the tail journal tightening component provides support at the tail of the blade to prevent the finished product from falling or being damaged after cutting, keeping the whole processing process stable and controllable.

[0036] The bottom plate 1 is the load-bearing structure of this clamping device. Its function is to uniformly install and firmly connect each functional component - including the elastic positioning shaft 3, the angular positioning component, and the tail shaft neck tightening component - to the workbench of the wire cutting machine tool, forming an integral clamping platform with rigidity, positioning accuracy, and a tool setting reference. In a specific implementation, the bottom plate 1 is made of pre-hardened steel S136H, connected to the machine tool through bolts or pins, providing stable mechanical support, and is provided with a tool setting reference surface for defining the starting point of the wire walking program. Multiple mounting positions are provided on the bottom plate 1 for fixing components such as the elastic positioning shaft 3, the angular positioning component, and the tail shaft neck tightening component, enabling a unified coordinate relationship among the components and achieving multi-point collaborative positioning. In addition, as the assembly foundation of the entire set of fixtures, the bottom plate 1 not only bears the loads of each component but also ensures that the position of the blade does not drift during the cutting process through its geometric accuracy and installation consistency. It is a key component for achieving the dimensional stability and path repeatability of the blade.

[0037] The elastic positioning component includes a mounting seat 2 and an elastic positioning shaft 3 provided on the mounting seat 2. The elastic positioning shaft 3 has an elastic chuck for clamping the positioning shaft neck of the stator blade to achieve axial center positioning of the positioning shaft neck. The end face of the elastic chuck is used to abut against the end face of the process boss of the stator blade to achieve axial positioning of the positioning shaft neck. When installing this structure, first fix the mounting seat 2 on the bottom plate 1 through screws and pins to form a rigid connection, and then embed the elastic positioning shaft 3 into the mounting seat 2 to ensure that its axis is aligned with the machine tool coordinates.

[0038] The number of stator blades is huge in the assembly of aero-engines. Generally, the number in one disk is more than 50. Moreover, the positioning structure of the blade journal on the fixture directly affects the precision of the finally cut blades. Conventionally, the part journal is positioned directly inside the mounting seat 2 using a positioning bushing. Even if the positioning bushing uses wear-resistant material CrWMn, with the increase in the number of clamped blades, the positioning holes of the positioning bushing at the part journal will definitely wear, and furthermore, there are also errors in the machining dimensions of the blade journal. These factors will all lead to unstable machining. Therefore, we use an elastic chuck structure that can both position and clamp the journal. The end face of the chuck and the end face of the front journal positioning boss of the part are supported. The elastic chuck has 4 slots with a width of 0.5 mm and a depth of 25 mm at the opening for deformation during clamping. The elastic chuck and the head of the outer end nut 4 are connected with a 7:24 taper for clamping the blade positioning journal when tightened. The positioning shaft is made of material 9SiCr and heat-treated to HRC44 - 48; the mounting nut of the elastic chuck is made of material 40CrNiMoA and heat-treated to HRC44 - 48 as well. The elastic chuck in the present invention can adapt to the dimensional errors of the blade journal, avoid machining instability caused by wear or error accumulation of the positioning bushing; meanwhile, it has advantages such as quick clamping, high repeat positioning accuracy, and strong versatility. Replaceable methods include using a taper sleeve tightening structure, a snap ring structure, or a replaceable limit block combination. For rotors with different diameters, modular matching can also be achieved by replacing the elastic chuck assembly or setting multiple groups of mounting holes, so as to take into account the clamping requirements of multiple types of blades.

[0039] Refer to Figure 2 , in a specific embodiment of the present invention, in order to enable the rear end of the stator blade to also obtain stable support during the cutting process and prevent it from falling after being cut, a tail journal tightening assembly is added to the wire cutting clamping device. The tightening assembly includes a support plate 8 and a support plate 9, where the support plate 9 is vertically fixed to the bottom plate 1 by bolts or pins. A through hole matching the tail journal of the stator blade is provided on the support plate 8, which can support the blade tail end and limit its large displacement before and during cutting. Specifically, a chute is axially provided on the support plate 9 along the tail journal, and the support plate 8 can slide back and forth in this chute and is precisely adjusted by screws or positioning pins, so as to fit the rear journal of the blade with different sizes or different tolerances. In this way, after the front end of the blade is clamped, the support plate 8 can move along the chute to a predetermined position and cooperate with the journal hole to fix the blade tail, forming a front and rear two-point support structure, effectively improving the overall clamping rigidity and stability.

[0040] To prevent the support plate 8 from accidentally falling off or moving out of its travel range during repeated clamping or cutting vibration, one end of the support plate 8 passing through the chute is bolted to a pull plate 10. The pull plate 10 can be opposite to the support plate 9 outside the chute, blocking the path of excessive sliding of the support plate 8. The operator only needs to loosen the corresponding screw to move the support plate 8 forward or backward in the chute, making it closer to or farther from the blade journal. In practical applications, if it is necessary to adjust the tail clamping position or replace the clamping mode for different models of stator blades, the support plate 8 can be slid out of the chute and replaced with a support plate 8 with a suitable hole diameter or shape, or multiple chutes with different specifications can be opened on the support plate 9 to adapt to various tail journal shapes or sizes. Components such as the support plate 8 and the support plate 9 can be made of non-conductive materials such as metal or POM acetal, which not only ensures the bearing capacity but also prevents current interference in the high-speed wire cutting area.

[0041] Referring to Figure 1 and Figure 3 , an angular positioning assembly is provided on the mounting seat 2 and is used to cooperate with the positioning surface on the positioning journal to achieve angular positioning of the positioning journal. The angular positioning assembly includes an angular block 5 and an adjusting screw 6. The angular block 5 is slidably engaged with the mounting seat 2, and the adjusting screw 6 is threadedly connected to the mounting seat 2 so that by rotating the adjusting screw 6, the angular block 5 can be pushed to move, making the angular block 5 press against the positioning surface of the positioning journal. In a specific embodiment, a square groove is formed on the mounting seat 2, and the straight inner wall of the groove prevents the angular block 5 from rotating or tilting and provides guidance for subsequent sliding adjustment. The angular block 5 and other wear-resistant materials are placed in the groove in a manner adapted to the groove, and their own attitude is kept stable through the close fit of the square cross-section.

[0042] To facilitate assembly and limit the vertical floating of the angular block 5, a cover plate 7 is provided above the groove and fastened to the mounting seat 2 by a number of screws. An appropriate gap is left between the cover plate 7 and the groove, enabling the angular block 5 to slide smoothly in the groove in one direction. One side of the angular block 5 is threadedly engaged with the adjusting screw 6, and the adjusting screw 6 passes through the mounting seat 2 and forms a rotatable threaded engagement relationship with it; when the operator rotates the screw, the angular block 5 moves back and forth in the groove.

[0043] In use, after clamping the front end of the positioning journal of the stator blade with the elastic positioning shaft 3, the adjusting screw 6 is used to drive the angular block 5 to finely adjust the position along the groove, so that the angular block 5 presses against the positioning surface on the journal. In this way, the blade obtains accurate angular limitation in the circumferential direction and is consistent with the machine tool coordinate system. During cutting, the angular block 5 can effectively prevent the blade from generating rotational displacement due to vibration or local stress, ensuring that the wire cutting path conforms to the predetermined position of the blade. In order to adapt to different models of blades or different angular requirements, the angular block 5 and the groove can be designed in various sizes and specifications, and a buffer pad or a limiting surface can also be added to the end of the angular block 5. The angular block 5 can be made of SKD11, DC50 or other wear-resistant materials, the cover plate 7 is made of material S136, and the mounting base 2 is made of material S136H.

[0044] It also includes a blade body supporting component, which includes a blade body tightening seat 12 and a blade body retaining pin 11; the upper surface inclination angle of the blade body tightening seat 12 matches the inclination angle of the stator blade profile to support the blade body part of the stator blade. The blade body retaining pin 11 is arranged on the lower side of the blade body tightening seat 12 to prevent the stator blade from slipping off the blade body tightening seat 12. The blade body tightening seat 12 is arranged above the bottom plate 1, and its upper surface inclination angle is close to the inclination angle of the stator blade profile and is made of a non-conductive material (such as POM acetal) to ensure that there are no safety hazards such as electric leakage during the high-speed wire cutting process. The tightening seat is usually fixed on the bottom plate 1 by the cooperation of a cylindrical pin and a diamond pin, so that it can be conveniently disassembled or replaced when needed. When the cutting program executes to the moment when the blade is completely separated from the process boss, the blade body can smoothly fall on this inclined surface, instead of falling onto the machine tool like the traditional method, resulting in scratches or time-consuming cleaning after pasting with plasticine.

[0045] To further prevent the blade body from slipping or shifting along the inclined direction, the blade body retaining pin 11 is arranged on the lower side of the tightening seat. Generally, two pins arranged side by side or front and back are set, which can effectively intercept the blade from sliding out of the lower inclined surface. Compared with the traditional method of pasting plasticine on the blade body, the solution of the present invention can be reused, is easy to operate, avoids the problems of plasticine loosening and contaminating parts in high-temperature or vibration environments, and also keeps the blade intact after cutting. Especially for blades of different models or different blade profile inclination angles, it can also be adapted by replacing the tightening seat with different inclination angles or materials, thus effectively improving the universality of clamping and production efficiency.

[0046] Refer to Figure 4 and Figure 5 , the wire cutting processing method of the stator blade includes the following steps:

[0047] S1, workpiece clamping, fixing the semi-finished stator blade to be processed on the wire cutting clamping device of the stator blade, and adjusting the angle and position of the stator blade in space according to the predetermined processing reference. The clamping position is the positioning journal of the semi-finished stator blade.

[0048] In this step, the operator places the semi-finished stator blade to be processed on the clamping device of the wire cutting machine tool, and adjusts the angle and position of the blade in space according to a predetermined reference such as the machine tool coordinate system G54, etc. The key is to use components such as the elastic positioning shaft 3 and the angular positioning assembly to clamp the blade positioning journal, so that the blade can meet the requirements of the wire walking program both radially and angularly. Since the fixture base plate 1 provides a unified tool setting surface and reduces instability caused by wear or dimensional deviation through elastic chuck type positioning, the accuracy of the subsequent wire walking path can be ensured after clamping. This precise clamping can also keep the blade rigid enough before cutting to prevent vibration from affecting the process effect.

[0049] S2. Partial cutting: Using the first wire walking program, starting from the initial reference position of the machine tool, partially cut the process boss area of the semi-finished stator blade, and keep an uncompletely cut connection part between the blade and the process boss.

[0050] The path of the first wire walking program is as follows: Place the blade with the back of the blade facing up, and let the wire cutting wire partially cut one end of the blade body close to the positioning journal and the end far from the positioning journal in sequence, but keep the uncompletely disconnected connection parts. Specifically, the wire starts from the initial origin G54, first reaches the end far from the positioning journal to perform partial cutting, then bypasses the left side of the blade body to reach the end close to the positioning journal, and then performs local cutting. Finally, the wire returns from this proximal blade body along the left side of the blade body to G54 again to form a closed wire walking path.

[0051] Execute the first wire walking program, sequentially perform local cutting on the process bosses of the stator blade from the initial reference position of the machine tool, and keep an uncompletely cut connection part between the boss and the blade body, so as to form a groove at each of the front and rear ends. This groove is slightly offset by adjusting the infeed and retraction paths of the cutting wire to keep a surface to be measured on one side of the blade. Compared with cutting off at one time, partial cutting can maintain the overall integrity and positioning reference of the blade, prevent the workpiece from suddenly falling or being scratched. This method makes the blade body approach the final shape at the "test piece" stage and provides a directly readable slit or step for subsequent measurement, which helps to detect deviations and correct them in time.

[0052] In the first wire cutting process, there is an offset between the path where the cutting wire exits the part and the path where the cutting wire enters the part, forming a groove for detection between the process boss and the stator blade. Specifically, when setting the program, a slight translation or offset is set for the wire trajectory when cutting into and out of the workpiece, so that the wire does not enter and exit along the same path, but forms a slightly misaligned closed wire cutting trajectory. When the wire cuts in and exits from different positions, a groove will be dug between the process boss and the blade body, and the surface of the groove close to the blade side becomes a smooth and intuitive plane for measurement, which is convenient for the measuring tool or microscope probe to compare and detect the actual shape of the blade.

[0053] In step S2, partial cutting is performed at both ends of the stator blade, so that grooves are formed at both ends of the stator blade. Performing local cutting at both ends of the stator blade simultaneously and forming grooves is mainly to retain the uncompletely disconnected connection segments at both ends, which can not only keep the blade's overall rigidity and clamping reference, but also form detectable "surfaces to be measured" on both the front and back sides, facilitating the comprehensive evaluation of dimensional errors from the blade's inlet edge, exhaust edge, or different assembly positions. Such a setting also enables the blade to be measured and corrected separately for the front and back ends before the final cutting, improving the machining accuracy and preventing the blade from falling off or being damaged due to one-time cutting.

[0054] S3, Dimension measurement: Using the process boss and the positioning journal as the measurement reference, measure the dimensional data of the stator blade after partial cutting, and judge whether it meets the predetermined tolerance range according to the measurement results; when the blade is in an uncompletely cut state, the process boss and the positioning journal can be used as the reference, and the actual dimensions and positions of the blade body relative to the journal center line can be measured by a measuring tool. When it is found that the deviation exceeds the tolerance range, it can be corrected by modifying the first wire cutting program. This measurement mode after partial cutting can significantly reduce the scrap rate: on the one hand, the blade still maintains its basic integrity, and the measurement data has sufficient accuracy; on the other hand, cutting and measurement can be repeated multiple times to achieve the purpose of gradually approaching the design dimensions.

[0055] S4, Path correction: If the measurement result does not meet the tolerance requirements, correct the first wire cutting program, and steps S2 and S3 can be repeated; if the measurement result meets the tolerance requirements, proceed to the next step. If it is found that the cutting error is large, fine-tune the first wire cutting path through the numerical control program, and partial cutting and re-measurement can be performed again; if the error is within the range, enter the final cutting stage. The feasibility of this multiple-cycle process stems from retaining some connections, so that the blade will not be completely separated and lose the clamping reference. Compared with the traditional mode of one-time cutting and then detection, the present invention significantly improves the dimensional qualification rate and reduces the risk of scratching or dropping.

[0056] S5. Complete cutting: Using the second wire threading process, the process boss of the stator vane is finally cut to form a finished vane without a boss. In the first and second wire threading processes, the paths for dividing the process boss and the stator vane coincide.

[0057] The path of the second wire threading process is as follows: The same starting point G54 as in Route 1 is adopted, but the wire sequentially cuts off the process bosses at one end far from the positioning journal and at one end close to the positioning journal. The specific process is as follows: The wire starts from one end far from the positioning journal, completely cuts off the boss at this end, then bypasses the right side of the blade body, and then cuts off the boss at one end close to the positioning journal until the blade is completely separated from the boss. After the cutting is completed, the wire returns to the initial reference G54 from the left side position of the blade body to achieve the complete separation of the entire blade body from the bosses at both ends. In the second wire threading process, the cutting wire starts from the same initial reference as in the first wire threading process, passes through one end far from the positioning journal, completely cuts off the process boss at one end far from the positioning journal, and then the cutting wire cuts off the process boss from one end close to the positioning journal to completely separate the stator vane from the process boss. After completely cutting the part, the cutting wire returns to the initial reference position. This design is mainly to ensure that the final finished cut is completely consistent with the measurement reference determined in the previous "test cutting". The grooves and measurement data formed after partial cutting in the first wire threading process are all based on the same wire threading path; if the second wire threading process starts from the same reference point along the same trajectory, it can ensure that the path coincides with the previously verified path during the final complete cutting, and there will be no dimensional inaccuracy or need for repositioning due to tool path deviation. Cutting the distal boss first and then the proximal boss can also further stabilize the blade clamping and prevent the blade from loosening or falling before complete separation, thereby effectively improving the cutting accuracy and the qualified rate of the finished product.

[0058] In step S5, a blade body supporting component is provided at the wire cutting station. The blade body supporting component is located below the stator vane. When the stator vane is completely separated from the process boss, the blade body supporting component supports the stator vane to prevent the stator vane from falling. The purpose of setting the blade body supporting component is to prevent the stator vane from suddenly losing support and falling after the process boss is completely removed, causing blade scratches or machine tool interference. Specifically, the blade body supporting component is usually installed above the bottom plate 1 and is designed in cooperation with the blade profile: its upper surface or inclined surface has the same angle as the blade profile and can catch or abut against the bottom of the blade at the moment when the blade is completely cut off from the boss. In addition, anti-slip structures such as retaining pins and blocks can be provided on the component to ensure that the blade will not slide out along the inclined surface. Since the cutting wire often breaks or vibrates during the final separation, without this supporting device, the blade may fall onto the machine tool table and cause scratches or knocks. Through this supporting component of the present invention, the blade can be safely "transited" to the fully processed state and can maintain a good posture even after the process boss is removed, thereby significantly reducing the quality risk and the additional operation burden.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for processing stator blades by wire cutting, characterized in that: The steps include: S1, workpiece clamping, fixing the semi-finished stator blade to be processed on the stator blade wire cutting clamping device, and adjusting the angle and position of the stator blade in space according to the predetermined processing reference, and the clamping position is the positioning journal of the semi-finished stator blade; S2, partial cutting, using the first wire feeding program, starting from the initial reference position of the machine tool, partially cutting the process boss area of ​​the stator blade semi-finished product, and maintaining an uncut connection between the blade and the process boss; S3, dimensional measurement, using the process boss and the positioning journal as the measurement reference, measuring the dimensional data of the stator blade after partial cutting, and judging whether it meets the predetermined tolerance range according to the measurement results; S4, path correction, if the measurement result does not meet the tolerance requirement, the first wire-feeding program is corrected, and steps S2 and S3 can be repeated; if the measurement result meets the tolerance requirement, the next step is performed; S5, complete cutting, using the second wire-cutting program to perform final cutting on the process boss of the stator blade to form a finished blade without the boss; the first wire-cutting program and the second wire-cutting program keep the trajectory overlapped on the segmentation path of the process boss and the stator blade.

2. The method for wire cutting of stator blades according to claim 1, characterized in that: In the first wire feeding program, there is an offset between the path of the cutting wire exiting the part and the path of the cutting wire entering the part, and thus a groove for dimension measurement is machined between the process boss and the stator blade, and the surface of the groove close to the stator blade side is a positioning surface that can be measured.

3. The method for wire cutting of stator blades according to claim 2, characterized in that: In step S2, partial cutting is performed on both ends of the stator blade, so that grooves are formed on both ends of the stator blade.

4. The method for wire cutting of stator blades according to claim 3, characterized in that: In the second wire feeding program, the cutting wire starts from the initial reference consistent with the first wire feeding program, so that the cutting wire first completes the complete removal of the process boss away from the end of the positioning shaft neck, and then completes the removal of the process boss close to the end of the positioning shaft neck, and finally completely separates the stator blade from the process boss, and returns to the initial reference position after the cutting is completed.

5. The method for wire cutting of stator blades according to claim 4, characterized in that: In step S5, a blade support assembly is provided at the online cutting station, and the blade support assembly is used to support the blade body of the stator blade when the stator blade is completely separated from the process boss.

6. A stator blade wire cutting clamping device, used in the stator blade wire cutting processing method according to any one of claims 1 to 5, characterized in that: include: A base plate (1) is used for connecting with a wire cutting machine and providing a reference surface for tool setting; An elastic positioning assembly comprises a mounting seat (2) and an elastic positioning shaft (3) arranged on the mounting seat (2), wherein the elastic positioning shaft (3) has an elastic chuck, the elastic chuck is used to radially clamp and position the positioning journal of a stator blade, and the end face of the elastic chuck is used to abut against the end face of a process boss of the stator blade to achieve axial positioning; The angular positioning component is arranged on the mounting seat (2) and is used to cooperate with the positioning surface on the stator blade positioning journal to achieve angular positioning.

7. The stator blade wire cutting clamping device according to claim 6, characterized in that: It also includes a tail shaft neck clamping assembly, which includes a support plate (8) and a support plate (9); The support plate (9) is fixed on the bottom plate (1) and is used to support the bearing plate (8). The support plate is provided with a hole for matching with the tail journal of the semi-finished stator blade.

8. The stator blade wire cutting clamping device according to claim 7, characterized in that: A slide groove is provided on the support plate (9) along the axial direction of the tail journal, and the support plate (8) is slidably installed in the slide groove of the support plate (9), so that the support plate (8) can be slid along the slide groove to make the support plate (8) approach or move away from the tail journal.

9. The stator blade wire cutting clamping device according to claim 6, characterized in that: It also includes a blade support assembly detachably connected to the base plate (1), the blade support assembly including a blade support seat (12) and a blade stop pin (11); The upper surface of the blade support seat (12) is arranged as an inclined surface matching the inclination angle of the stator blade profile, and is used to support the blade body of the stator blade; The blade body stop pin (11) is arranged on the lower side of the blade body holding seat (12) and is used to prevent the stator blades from sliding off the holding seat.

10. The stator blade wire cutting clamping device according to claim 9, characterized in that: The angular positioning assembly comprises an angular block (5) and an adjusting screw (6), wherein the angular block (5) is slidably matched with the mounting seat (2), and the adjusting screw (6) is threadedly connected with the mounting seat (2) and abuts against the end face of the angular block (5), so that the angular block (5) moves radially by rotating the adjusting screw (6), thereby tightening the positioning surface of the stator blade positioning journal to achieve angular limiting.

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