Variable cycle vane shroud slot machining apparatus

Abstract

The present application relates to a kind of variable cycle vane cover plate groove processing device, belong to the field of aero-engine manufacturing.It includes: fixture, electrode and electrode chuck, variable cycle vane is fixedly installed in the fixture, the upper rotating shaft in the variable cycle vane passes through the electrode, and the electrode is fixedly installed on the electrode chuck;The bottom end of the electrode is provided with a plurality of special-shaped electrodes, a plurality of the special-shaped electrodes are arranged around the upper rotating shaft, the bottom end of the special-shaped electrode is in contact with the cover plate in the variable cycle vane, and a plurality of cover plate grooves corresponding to the shape of the special-shaped electrode are formed under the action of electric pulse.The present application is favorable to simultaneously process a plurality of vane cover plate grooves on variable cycle vane by electric pulse, simplifies tool structure, avoids processing interference and the deformation problem caused by machining, and improves processing precision and efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aero-engine manufacturing, and particularly relates to a variable cycle vane cover plate groove processing device. BACKGROUND

[0002] The variable cycle vane cover plate groove plays an important role in an aero-engine, and is an important channel for vane heat dissipation, which can enhance the cooling effect, and can provide necessary heat dissipation and cooling channels for the vane to ensure normal work of the vane in a high-temperature and high-pressure environment.

[0003] The variable cycle vane is composed of an upper rotating shaft, a vane body and a lower rotating shaft, and a plurality of special-shaped grooves are uniformly distributed on the upper rotating shaft cover plate part and need to be processed. Since the variable cycle vane has a complex structure and the lower rotating shaft is used as a positioning reference and is very narrow, the processing stability is poor, and therefore the processing of the vane cover plate groove also faces many technical challenges. Common groove processing can adopt numerical control milling, laser cutting and electric pulse processing. In the processing process, the processing quality, tool interference and processing cost problems need to be considered, and the deformation problem caused by mechanical cutting force also exists, and the stability of the clamp is required to be high. The processing of a complex profile is not suitable. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a variable cycle vane cover plate groove processing device, which can process a plurality of vane cover plate grooves on the variable cycle vane through electric pulse at the same time.

[0005] The technical scheme for solving the above technical problem is as follows: a variable cycle vane cover plate groove processing device, comprising: a clamp, an electrode and an electrode holder, a variable cycle vane is fixedly installed in the clamp, an upper rotating shaft in the variable cycle vane passes through the electrode, and the electrode is fixedly installed on the electrode holder; a plurality of special-shaped electrodes are arranged at the bottom end of the electrode, the plurality of special-shaped electrodes are arranged around the upper rotating shaft, the bottom end of the special-shaped electrode abuts against a cover plate in the variable cycle vane, and a plurality of cover plate grooves corresponding to the shape of the special-shaped electrode are formed under the action of electric pulse.

[0006] The beneficial effects of the present application are as follows: the plurality of special-shaped electrodes arranged on the electrode are beneficial to processing the cover plate on the variable cycle vane through electric processing, beneficial to processing a plurality of cover plate grooves on the cover plate at the same time, simplify the tooling structure, avoid the deformation problem caused by processing interference and mechanical processing, and improve the processing precision and efficiency; the clamp is beneficial to stably fixing the variable cycle vane, and only one clamping is needed, thereby improving the processing efficiency.

[0007] On the basis of the above technical scheme, the present application can also be improved as follows.

[0008] Further, the electrode further comprises a cylindrical electrode body and an electrode bump, a plurality of the special-shaped electrodes are arranged at the bottom end of the cylindrical electrode body, the electrode bump is arranged at the top end of the cylindrical electrode body, and the electrode bump is connected with the electrode chuck.

[0009] The beneficial effect of the above further scheme is that the plurality of special-shaped electrodes are designed as a whole with the cylindrical electrode body, which is beneficial to improve the efficiency, improve the consistency of the processing size, and reduce the production cost of a single product; the electrode bump is beneficial to facilitate the electrode alignment direction during processing and quickly determine the processing reference.

[0010] Further, the electrode chuck is a block structure provided with a bump fixing groove at the bottom end, the electrode bump is adaptively arranged in the bump fixing groove, a plurality of locking screws are arranged on the outer sidewall of the electrode chuck, the locking screws pass through the sidewall of the electrode chuck and abut against the electrode bump.

[0011] The beneficial effect of the above further scheme is that the bump fixing groove cooperates with the locking screw to fix the electrode bump, thereby fixing the electrode in the electrode chuck.

[0012] Further, the cylindrical electrode body is axially provided with a first upper rotating shaft through hole, the electrode chuck is axially provided with a second upper rotating shaft through hole, and the upper rotating shaft passes through the first upper rotating shaft through hole and the second upper rotating shaft through hole.

[0013] The beneficial effect of the above further scheme is that the first upper rotating shaft through hole and the second upper rotating shaft through hole are beneficial to limit the upper rotating shaft of the variable cycle blade, avoid interference problems, and are also beneficial to the determination of the electrode center line.

[0014] Further, the clamp comprises two clamping mechanisms, an upper positioning block, a lower positioning block, a blade body positioning block, a bottom plate and a vertical plate; the vertical plate is vertically installed on one side of the bottom plate, the two clamping mechanisms are one-to-one correspondingly installed on the upper and lower sidewalls of the vertical plate, the upper positioning block and the lower positioning block are installed on the vertical plate and correspond to the two clamping mechanisms one-to-one, and the blade body positioning block is installed on the vertical plate and arranged between the two clamping mechanisms; and the variable cycle blade is installed and fixed in the clamp.

[0015] The beneficial effect of the above further scheme is that the two clamping mechanisms cooperate with the upper positioning block and the lower positioning block to limit and fix the upper rotating shaft and the lower rotating shaft of the variable cycle blade, and the blade body positioning block is beneficial to abut and fix the blade body of the variable cycle blade.

[0016] Further, the clamping mechanism comprises two fixed supports, a pressing plate, a wing nut and a movable bolt; the two fixed supports are installed on the two sides of the vertical plate respectively; one end of the pressing plate is hinged to one of the fixed supports through a pin shaft; the other end of the pressing plate is a U-shaped clamping block; the movable bolt passes through the U-shaped clamping block and is connected to the other fixed support through a pin shaft at the bottom end; the wing nut is installed at the top end of the movable bolt; the U-shaped clamping block is arranged between the other fixed support and the wing nut; and the side of the pressing plate close to the vertical plate is provided with a V-shaped groove.

[0017] The beneficial effect of the above further scheme is that the wing nut and the movable bolt are beneficial to limit and fix the other end of the pressing plate, and cooperate with the hinging of one end of the pressing plate to the fixed support, so as to facilitate the clamping and dismounting of the upper rotating shaft and the lower rotating shaft of the variable cycle vane.

[0018] Further, the upper positioning block comprises an upper fixed plate, a limiting boss and two upper clamping blocks; the upper fixed plate is installed on the vertical plate; the upper clamping blocks and the limiting boss are installed on the upper fixed plate; the sides of the two upper clamping blocks close to each other form a V-shaped structure; and the limiting boss abuts against the top end of the cover plate.

[0019] The beneficial effect of the above further scheme is that the V-shaped structure formed by the two upper clamping blocks is beneficial to improve the stability when the upper rotating shaft and the lower rotating shaft of the variable cycle vane are clamped, and the abutment of the limiting boss and the top end of the cover plate is beneficial to limit the variable cycle vane in the axial direction.

[0020] Further, the lower positioning block comprises a lower fixed plate and a lower clamping block; the lower fixed plate is installed on the vertical plate; and the lower clamping block is a plate-shaped structure installed on the lower fixed plate and provided with a V-shaped groove close to the side of the pressing plate.

[0021] The beneficial effect of the above further scheme is that the V-shaped groove provided on the side of the lower clamping block close to the pressing plate is beneficial to improve the stability when the upper rotating shaft and the lower rotating shaft of the variable cycle vane are clamped.

[0022] Further, the variable cycle vane further comprises a lower rotating shaft; the upper rotating shaft in the variable cycle vane is adaptively arranged in the V-shaped structure formed by the two upper clamping blocks and the V-shaped groove of the pressing plate; and the lower rotating shaft is adaptively arranged in the V-shaped groove of the lower clamping block and the V-shaped groove of the pressing plate.

[0023] The beneficial effect of the further scheme is that the V-shaped structure formed by the upper clamping block and the V-shaped groove of the pressing plate is beneficial to adapt and connect the upper rotating shaft of the variable cycle blade, the V-shaped groove of the lower clamping block and the V-shaped groove of the pressing plate are beneficial to adapt and connect the lower rotating shaft of the variable cycle blade, thereby improving the stability of clamping the variable cycle blade.

[0024] Further, the blade positioning block comprises an abutting block fixing plate and a blade abutting block, the abutting block fixing plate is installed on the vertical plate, and the blade abutting block is a plate-shaped structure installed on the abutting block fixing plate and abutting with the blade in the variable cycle blade.

[0025] The beneficial effect of the further scheme is that the blade abutting block abuts with the blade in the variable cycle blade, which is beneficial to further improve the stability of the clamp when clamping the variable cycle blade. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The overall structure front view is provided for the embodiment of the application;

[0027] Figure 2 The overall structure side view is provided for the embodiment of the application;

[0028] Figure 3 The structure schematic diagram of the clamp is provided for the embodiment of the application;

[0029] Figure 4 The structure schematic diagram of the electrode is provided for the embodiment of the application;

[0030] Figure 5 The structure schematic diagram of the electrode chuck is provided for the embodiment of the application;

[0031] Figure 6 The structure schematic diagram of the variable cycle blade is provided for the embodiment of the application.

[0032] In the drawings, the components represented by each number are listed as follows:

[0033] 1, clamp; 2, electrode; 3, electrode holder; 4, variable cycle vane; 11, clamping mechanism; 12, upper positioning block; 13, lower positioning block; 14, vane positioning block; 15, bottom plate; 16, vertical plate; 21, special-shaped electrode; 22, cylindrical electrode body; 23, electrode protrusion; 31, protrusion fixing groove; 32, second upper rotating shaft through hole; 33, threaded hole; 34, locking screw; 41, upper rotating shaft; 42, lower rotating shaft; 43, vane; 44, cover plate; 111, fixed support; 112, pressing plate; 113, butterfly nut; 114, movable bolt; 121, upper fixed plate; 122, limiting boss; 123, upper clamping block; 131, lower fixed plate; 132, lower clamping block; 141, abutting block fixed plate; 142, vane abutting block; 221, first upper rotating shaft through hole; 441, cover plate groove; 1121, U-shaped clamping block. DETAILED DESCRIPTION

[0034] The principles and characteristics of the present application are described below, and the examples are only used to explain the present application, and not to limit the scope of the present application.

[0035] As shown in Figures 1 to 6 A variable cycle vane cover plate groove processing device, comprising: a clamp 1, an electrode 2 and an electrode holder 3, a variable cycle vane 4 is fixedly installed in the clamp 1, an upper rotating shaft 41 in the variable cycle vane 4 passes through the electrode 2, and the electrode 2 is fixedly installed on the electrode holder 3; a plurality of special-shaped electrodes 21 are arranged at the bottom end of the electrode 2, the plurality of special-shaped electrodes 21 are arranged around the upper rotating shaft 41, the bottom end of the special-shaped electrode 21 abuts against a cover plate 44 in the variable cycle vane 4, and a plurality of cover plate grooves 441 corresponding to the shape of the special-shaped electrode 21 are formed under the action of an electric pulse.

[0036] It should be noted that in the technical scheme of the present application, the lower side chamfer of the special-shaped electrode 21 is beneficial to reduce the weight of the electrode 2.

[0037] The beneficial effects of the present application are: the plurality of special-shaped electrodes arranged on the electrode are beneficial to process the cover plate on the variable cycle vane by means of electric processing, are beneficial to process a plurality of cover plate grooves on the cover plate at the same time, simplify the tooling structure, avoid the deformation problem caused by processing interference and mechanical processing, and improve the processing precision and efficiency; the clamp is beneficial to stably fix the variable cycle vane, and only one clamping is needed, thereby improving the processing efficiency.

[0038] Preferably, as shown in Figure 4As shown, the electrode 2 further comprises a cylindrical electrode body 22 and an electrode bump 23, a plurality of the special-shaped electrodes 21 are arranged around the bottom end of the cylindrical electrode body 22, and the electrode bump 23 is arranged at the top end of the cylindrical electrode body 22, and the electrode bump 23 is connected with the electrode chuck 3.

[0039] It should be noted that, in the technical scheme of the present application, the electrode bump 23 is a cuboid structure.

[0040] The beneficial effects of the above preferred scheme are: the plurality of special-shaped electrodes are designed integrally with the cylindrical electrode body, which is beneficial to improve the efficiency, improve the consistency of the processing size, and reduce the production cost of a single product; the electrode bump is beneficial to facilitate the electrode alignment direction during processing and quickly determine the processing reference.

[0041] Preferably, as shown in Figure 5 As shown, the electrode chuck 3 is a block structure provided with a bump fixing groove 31 at the bottom end, the electrode bump 23 is adaptively arranged in the bump fixing groove 31, a plurality of locking screws 34 are arranged on the outer side wall of the electrode chuck 3, the locking screws 34 pass through the side wall of the electrode chuck 3 and abut against the electrode bump 23.

[0042] It should be noted that, in the technical scheme of the present application, the top end of the electrode chuck 3 is provided with a plurality of threaded holes 33 for fixing the electrode chuck 3 on a machine tool.

[0043] The beneficial effects of the above preferred scheme are: the bump fixing groove cooperates with the locking screw to fix the electrode bump, thereby fixing the electrode in the electrode chuck.

[0044] Preferably, as shown in Figure 4 and Figure 5 As shown, the cylindrical electrode body 22 is axially provided with a first upper rotating shaft through hole 221, the electrode chuck 3 is axially provided with a second upper rotating shaft through hole 32, and the upper rotating shaft 41 passes through the first upper rotating shaft through hole 221 and the second upper rotating shaft through hole 32.

[0045] The beneficial effects of the above preferred scheme are: the first upper rotating shaft through hole and the second upper rotating shaft through hole are beneficial to limit the upper rotating shaft of the variable cycle vane, avoid interference problems, and are also beneficial to the determination of the electrode center line.

[0046] Preferably, as shown in Figures 1 to 3As shown, the clamp 1 includes: two clamping mechanisms 11, an upper positioning block 12, a lower positioning block 13, a blade positioning block 14, a base plate 15, and a vertical plate 16; the vertical plate 16 is vertically installed on one side of the base plate 15, the two clamping mechanisms 11 are installed one-to-one on the upper and lower side walls of the vertical plate 16, the upper positioning block 12 and the lower positioning block 13 are installed on the vertical plate 16 and correspond one-to-one with the two clamping mechanisms 11, the blade positioning block 14 is installed on the vertical plate 16 and is disposed between the two clamping mechanisms 11, and the variable circulation blade 4 is installed and fixed in the clamp 1.

[0047] The advantages of adopting the above preferred solution are: the two clamping mechanisms, together with the upper and lower positioning blocks, are conducive to limiting and fixing the upper and lower rotation axes of the variable circulation blade, and the blade positioning block is conducive to abutting and fixing the blade body of the variable circulation blade.

[0048] Preferred, such as Figure 3 As shown, the clamping mechanism 11 includes: two fixed supports 111, a pressure plate 112, a wing nut 113, and a movable bolt 114; the two fixed supports 111 are installed one-to-one on both sides of the upright plate 16; one end of the pressure plate 112 is hinged to one of the fixed supports 111 by a pin; the other end of the pressure plate 112 is a U-shaped locking block 1121; the movable bolt 114 passes through the U-shaped locking block 1121 and its bottom end is connected to the other fixed support 111 by a pin; the wing nut 113 is installed on the top of the movable bolt 114; the U-shaped locking block 1121 is disposed between the other fixed support 111 and the wing nut 113; and the pressure plate 112 has a V-shaped groove on the side near the upright plate 16.

[0049] The advantages of adopting the above preferred solution are: the wing nut and the movable bolt help to limit and fix the other end of the pressure plate, and the hinge of one end of the pressure plate to the fixed support facilitates the clamping and disassembly of the upper and lower rotating shafts of the variable circulation blade.

[0050] Preferred, such as Figure 3 As shown, the upper positioning block 12 includes: an upper fixing plate 121, a limiting boss 122, and two upper clamping blocks 123; the upper fixing plate 121 is mounted on the upright plate 16, the upper clamping blocks 123 and the limiting boss 122 are both mounted on the upper fixing plate 121, the two upper clamping blocks 123 form a V-shaped structure on the side that is close to each other, and the limiting boss 122 abuts against the top of the cover plate 44.

[0051] The beneficial effect of the above preferred scheme is that the V-shaped structure formed by the two upper clamping blocks is conducive to improving the stability of the upper rotating shaft and the lower rotating shaft of the clamped variable cycle vane.

[0052] Preferably, as shown in Figure 3 The lower positioning block 13 includes a lower fixed plate 131 and a lower clamping block 132, the lower fixed plate 131 is installed on the vertical plate 16, and the lower clamping block 132 is a plate-shaped structure provided with a V-shaped groove on one side close to the pressing plate 112.

[0053] The beneficial effect of the above preferred scheme is that the V-shaped groove on the side of the lower clamping block close to the pressing plate is conducive to improving the stability of the upper rotating shaft and the lower rotating shaft of the clamped variable cycle vane.

[0054] Preferably, as shown in Figure 3 The variable cycle vane 4 further includes a lower rotating shaft 42, and the upper rotating shaft 41 in the variable cycle vane 4 is adaptively arranged in the V-shaped structure formed by the two upper clamping blocks 123 and the V-shaped groove of the pressing plate 112, and the lower rotating shaft 42 is adaptively arranged in the V-shaped groove of the lower clamping block 132 and the V-shaped groove of the pressing plate 112.

[0055] The beneficial effect of the above preferred scheme is that the V-shaped structure formed by the upper clamping block and the V-shaped groove of the pressing plate are conducive to adaptively clamping the upper rotating shaft of the variable cycle vane, and the V-shaped groove of the lower clamping block and the V-shaped groove of the pressing plate are conducive to adaptively clamping the lower rotating shaft of the variable cycle vane, thereby improving the stability of the clamped variable cycle vane.

[0056] Preferably, as shown in Figure 3 The vane body positioning block 14 includes an abutting block fixed plate 141 and a vane body abutting block 142, the abutting block fixed plate 141 is installed on the vertical plate 16, and the vane body abutting block 142 is a plate-shaped structure adaptively abutting with the vane body 43 in the variable cycle vane 4.

[0057] The beneficial effect of the above preferred scheme is that the vane body abutting block adaptively abuts with the vane body in the variable cycle vane, which is conducive to further improving the stability of the clamped variable cycle vane.

[0058] In the preferred embodiment of the present application, the rough machining is followed by the fine machining, a margin is left during the rough machining, the final size requirement is reached during the fine machining, the cross-sectional area of the special-shaped electrode 21 during the fine machining is smaller than that of the cover plate groove 441, the shape is consistent with that of the cover plate groove 441, the single-sided discharge gap of 0.05 is considered, the cross-sectional area of the special-shaped electrode 21 during the rough machining is smaller than that of the special-shaped electrode 21 during the fine machining, and the single-sided margin of 0.5 is considered.

[0059] The rough machining parameters are as follows: pulse width 10, pulse interval 8, current 5, and voltage 60.

[0060] The fine machining parameters are as follows: pulse width 8, pulse interval 10, current 3, and voltage 60.

[0061] The rough machining has large pulse discharge energy, can quickly remove a large amount of material, and significantly improves the machining efficiency; the fine machining can achieve millimeter-level or even higher machining precision, the pulse discharge duration is short, the heat does not have time to conduct to the inside of the material, so that the surface heat affected zone is small, the precision can be controlled within 0.02 by selecting appropriate equipment and parameters during the fine machining, and the surface roughness can reach Ra1.6μm or higher, thereby meeting the high-precision requirement.

[0062] The material selection: according to the machining requirement and the use environment, the special-shaped electrode 21 preferentially selects a graphite material with high density, high strength, high conductivity, and good corrosion resistance, the graphite electrode has high machining efficiency, is 2 to 3 times faster than a copper electrode, can greatly shorten the machining period, has high machining precision, stable quality, and is easy to machine various complex-shaped parts, the graphite electrode has a small expansion coefficient, and is not easy to be affected by thermal deformation during the machining process, thereby affecting the precision and quality of the electrode.

[0063] The present application has the following positive effects:

[0064] 1. The selection of the electro-machining mode is beneficial to simplify the tool structure, avoid machining interference, improve the machining precision and efficiency, and improve the machining precision and efficiency.

[0065] 2. The upper and lower positioning blocks, the clamping mechanism, and the blade positioning block of the clamp are beneficial to stably fix the blade in the clamp, and improve the stability of the clamp by using the V-shaped structure.

[0066] 3. The selection of the graphite electrode material is beneficial to high machining efficiency, and can greatly shorten the machining period.

[0067] 4. The electrode is machined in the sequence of rough machining and fine machining, the rough machining has large pulse discharge energy, can quickly remove a large amount of material, and significantly improves the machining efficiency; the fine machining can achieve millimeter-level or even higher machining precision, and significantly improves the product quality.

[0068] In the description of the application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0069] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0070] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0072] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0073] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A variable cycle vane shroud slot machining apparatus characterized by, The utility model relates to a variable cycle vane electrode clamp structure, including: Clamp (1), electrode (2) and electrode chuck (3), variable cycle vane (4) is fixedly installed in the clamp (1), the upper rotation shaft (41) in the variable cycle vane (4) passes through the electrode (2), and the electrode (2) is fixedly installed on the electrode chuck (3); The bottom end of the electrode (2) is provided with a plurality of special-shaped electrodes (21), and the plurality of special-shaped electrodes (21) are arranged around the upper rotation shaft (41). The bottom end of the special-shaped electrode (21) abuts against the cover plate (44) in the variable cycle vane (4) and forms a plurality of cover plate grooves (441) corresponding to the shape of the special-shaped electrode (21) under the action of an electric pulse. The electrode (2) further includes a cylindrical electrode body (22) and an electrode protrusion (23). The plurality of special-shaped electrodes (21) are arranged around the bottom end of the cylindrical electrode body (22). The electrode protrusion (23) is arranged at the top end of the cylindrical electrode body (22). The electrode protrusion (23) is connected to the electrode chuck (3). The cylindrical electrode body (22) is axially provided with a first upper rotation shaft through hole (221). The electrode chuck (3) is axially provided with a second upper rotation shaft through hole (32). The upper rotation shaft (41) passes through the first upper rotation shaft through hole (221) and the second upper rotation shaft through hole (32). The clamp (1) includes two clamping mechanisms (11), an upper positioning block (12), a lower positioning block (13), a blade body positioning block (14), a bottom plate (15), and a vertical plate (16). The vertical plate (16) is vertically installed on one side of the bottom plate (15). The two clamping mechanisms (11) are one-to-one correspondingly installed on the upper and lower side walls of the vertical plate (16). The upper positioning block (12) and the lower positioning block (13) are installed on the vertical plate (16) and correspond to the two clamping mechanisms (11) one-to-one. The blade body positioning block (14) is installed on the vertical plate (16) and arranged between the two clamping mechanisms (11). The variable cycle vane (4) is fixedly installed in the clamp (1). The upper positioning block (12) includes an upper fixed plate (121), a limiting boss (122), and two upper clamping blocks (123). The upper fixed plate (121) is installed on the vertical plate (16). The upper clamping blocks (123) and the limiting boss (122) are both installed on the upper fixed plate (121). The two upper clamping blocks (123) are formed in a V-shaped structure on the side close to each other. The limiting boss (122) abuts against the top end of the cover plate (44).

2. A variable cycle vane shroud slot machining apparatus as claimed in claim 1, wherein The electrode chuck (3) is a block-shaped structure provided with a protrusion fixing groove (31) at the bottom end. The electrode protrusion (23) is adaptively arranged in the protrusion fixing groove (31). A plurality of locking screws (34) are arranged on the outer side wall of the electrode chuck (3). The locking screws (34) pass through the side wall of the electrode chuck (3) and abut against the electrode protrusion (23).

3. A variable cycle vane shroud slot machining apparatus as claimed in claim 1, wherein The clamping mechanism (11) comprises two fixed supports (111), a pressing plate (112), a butterfly nut (113) and a movable bolt (114); the two fixed supports (111) are installed on the two sides of the vertical plate (16) one by one, one end of the pressing plate (112) is hinged to one of the fixed supports (111) through a pin shaft, the other end of the pressing plate (112) is a U-shaped clamping block (1121), the movable bolt (114) passes through the U-shaped clamping block (1121), and the bottom end is connected to the other fixed support (111) through a pin shaft, the butterfly nut (113) is installed at the top end of the movable bolt (114), the U-shaped clamping block (1121) is arranged between the other fixed support (111) and the butterfly nut (113), and the side of the pressing plate (112) close to the vertical plate (16) is provided with a V-shaped groove.

4. A variable cycle vane shroud slot machining apparatus as claimed in claim 3, wherein The lower positioning block (13) comprises a lower fixed plate (131) and a lower clamping block (132), the lower fixed plate (131) is installed on the vertical plate (16), and the lower clamping block (132) is a plate-shaped structure provided with a V-shaped groove on the side close to the pressing plate (112) and installed on the lower fixed plate (131).

5. A variable cycle vane shroud slot machining apparatus as claimed in claim 4, wherein The variable cycle blade (4) further comprises a lower rotating shaft (42), the upper rotating shaft (41) in the variable cycle blade (4) is adaptively arranged in the V-shaped structure formed by the two upper clamping blocks (123) and the V-shaped groove of the pressing plate (112), and the lower rotating shaft (42) is adaptively arranged in the V-shaped groove of the lower clamping block (132) and the V-shaped groove of the pressing plate (112).

6. A variable cycle vane shroud slot machining apparatus as claimed in claim 1, wherein The blade positioning block (14) comprises an abutting block fixed plate (141) and a blade abutting block (142), the abutting block fixed plate (141) is installed on the vertical plate (16), and the blade abutting block (142) is a plate-shaped structure which is installed on the abutting block fixed plate (141) and abuts against the blade (43) in the variable cycle blade (4).

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