An aeroengine blade shroud milling fixture and method

Abstract

This invention provides a milling fixture and method for aero-engine blade rim plates. The milling fixture employs a movable center seat and a rotating jaw. The rotating jaw clamps the blade mating surfaces at different angles, thereby radially positioning the blade. The movable center seat aligns the machining process reference with the design reference, thus axially positioning the blade. This eliminates the defects of existing technologies using fixed-angle vises that can damage the blade, protecting the two mating surfaces of the blade, ensuring accurate positioning of the blade rim plate during machining, improving production efficiency, and increasing yield. Furthermore, this invention is applicable to clamping various types of blades, such as steam turbine blades and centrifuge blades, demonstrating a wide range of applications.

Description

Technical Field

[0001] This invention belongs to the field of aviation repair, specifically relating to a milling fixture and method for aircraft engine blade rim plates. Background Technology

[0002] Stator blades of a certain type of engine, such as Figure 1 , Figure 2 As shown, the device includes a flange end and a mounting end. The flange end and mounting end have collinear blade center holes. The two sides of the flange end are the blade mating surfaces, and the top and bottom surfaces are the upper and lower flanges, respectively. To assemble the blades into a ring shape on the casing, the mating surface angle of the blades must be β, and the dimensional reference must be the axis of the center holes at both ends of the blades. Therefore, the blades need to be clamped between the mating surfaces at both ends before the upper and lower flanges are milled.

[0003] The existing processing method uses an angled vise to clamp and position the blade's mating surface, and then machines the upper and lower edge plates separately on a milling machine. However, before machining, because the mating surface angles of each stator blade are different, there is still a machining error of ±γ. Therefore, it is difficult for the mating surface to be completely aligned with the vise clamping, and the vise is very prone to damaging the two mating surfaces of the blade during machining, resulting in the scrapping of the blade and a high scrap rate.

[0004] Therefore, it is essential to provide a milling fixture and method for aero-engine blade rim plates. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of difficulty in achieving complete fit and high scrap rate when clamping and positioning blades in existing processing methods. To this end, a milling fixture and method for aero-engine blade edge plates are provided.

[0006] To achieve the above objectives, the technical solution provided by this invention is:

[0007] A milling fixture for aircraft engine blade rim plates, characterized by:

[0008] Includes a base, a self-centering vise, and a movable positioning mechanism;

[0009] The base is a load-bearing carrier used to install the self-centering vise and the movable positioning mechanism;

[0010] The self-centering vise includes a vise body, a positioning block, a clamping screw, a fixing center, and two jaw units;

[0011] The clamp body is fixedly mounted on the base;

[0012] The positioning block is slidably mounted on the clamp body, and the positioning block is provided with a fixed tip, the tip of which extends beyond the end face of the positioning block.

[0013] The clamping screw is located on the upper end face of the clamp body; the clamping screw is a screw with both positive and negative threads, and the two ends of the clamping screw are connected to two jaw units simultaneously through positive and negative threads, and the two jaw units clamp the two mating surfaces of the blade respectively;

[0014] A screw positioning block is fitted in the middle of the clamping screw, and the screw positioning block is set in the clamp body to limit the axial movement of the clamping screw;

[0015] The movable positioning mechanism includes a support, a slide, a center seat, and a movable center.

[0016] The support member is fixed to the base;

[0017] The slide is movably mounted on the support, and the top seat is fixed on the slide;

[0018] The movable tip passes through the support and the slide, and is located inside the tip seat, with the tip of the movable tip extending beyond the end face of the tip seat; the tip seat is provided with guide screws for clamping the movable tip.

[0019] Furthermore, the upper end face of the clamp body is provided with a dovetail groove, and the middle of the dovetail groove is provided with a mounting hole for installing the screw positioning block;

[0020] The lower end of the positioning block is provided with a sliding groove that matches the dovetail groove, and the positioning block can be slidably fitted into the clamp body.

[0021] Furthermore, the front end face of the positioning block is provided with a first through hole and a second through hole with increasing diameter; the fixing tip is disposed in the first through hole; the rear end of the fixing tip is provided with a compression spring and a screw plug; the compression spring and the screw plug are disposed in the second through hole, and the two ends of the compression spring contact the fixing tip and the screw plug respectively.

[0022] Furthermore, in order to secure the positioning block, the positioning block is provided with a screw, the head of which is pressed against the end face of the dovetail groove.

[0023] Furthermore, the jaw unit includes jaws, jaw pads, jaw seats, and sliders;

[0024] The jaws are cylindrical, and the side end faces of the jaws include a mounting surface and a mating surface;

[0025] The cross-section of the jaws is an arc-shaped cross-section composed of the major arc and the chord of a circle, wherein the surface containing the major arc of the circle is the mating surface, and the plane containing the chord of the circle is the mounting surface.

[0026] The jaw pad is a rectangular pad that mates with the mounting surface; the mounting surface has multiple threaded blind holes for mounting countersunk screws, and the jaw pad is mounted on the jaws by countersunk screws;

[0027] The jaw seat is cylindrical, and the front end of the jaw seat mates with the mating surface of the jaws; the jaw seat is fixed on the slider, and the lower end of the slider is provided with a groove that mates with the dovetail groove, and the slider is slidably fitted into the jaw body;

[0028] The slider is provided with a threaded through hole that mates with the clamping screw. The clamping screw is connected to two jaw units at both ends, and the axial displacement of the jaw units is controlled simultaneously.

[0029] Furthermore, in order to limit the rotation range of the jaws, a mating groove is provided on the mating surface of the jaws, and a set screw for connecting the jaws is provided on the jaw seat, with one end of the set screw extending beyond the end face of the jaw seat set in the mating groove.

[0030] Furthermore, the support member is fixed to the base with screws; the support member is provided with two guide rails and two stops, and the front end face of the support member is provided with multiple mounting holes for mounting the guide rails and stops;

[0031] There are two slide blocks, each with a groove at its bottom that mates with a guide rail, and the slide blocks are slidably mounted on the guide rail; the two stops are installed at both ends of the guide rail to limit the movement of the slide blocks.

[0032] The center seat includes a center seat mounting plate and a center column perpendicular to the mounting plate; the center seat mounting plate is fixed on two slides;

[0033] The center post has a center channel for installing a movable center, and the tip of the movable center extends out of the center seat; the center post has a guide screw perpendicular to the center channel, and the center seat has a threaded through hole for installing the guide screw, and the bottom end of the guide screw contacts the side wall of the movable center.

[0034] The tail end of the movable tip is provided with a threaded blind hole for installing a screw; the front end of the screw is threadedly connected to the tail end of the movable tip, and the rear end passes through the tip seat, slide and support in sequence.

[0035] Preferably, for ease of operation, a vise handle is provided at the end of the clamping screw that extends beyond the vise body;

[0036] The screw has a positioning handle at its rear end.

[0037] Preferably, the base is provided with multiple eye bolts for easy hoisting.

[0038] A method for milling the blade rim plate of an aero-engine using the aforementioned milling fixture is characterized by the following steps:

[0039] Step 1: Place the center holes at both ends of the blade onto the movable and fixed centers of the clamp, respectively. Adjust the position of the fixed center by sliding the positioning block in the dovetail groove of the clamp body, and adjust the position of the movable center by sliding the slide block on the guide rail. Make the position relationship of the two centers adapt to the error changes of the actual blade size A±m and B±n, and complete the blade positioning.

[0040] Step 2: Rotate the positioning handle to push out the movable center point, push the blade to retract the fixed center point, and make the blade edge plate fit against the end face of the positioning block;

[0041] Step 3: Rotate the vise handle to make the two jaw pads fully contact the blade and clamp the blade.

[0042] Step 4: Mill the upper edge plate of the blade;

[0043] Step 5: Rotate the vise handle to loosen the vise. After rotating the blade 180°, re-align the two jaw pads with the blade's contact surface and clamp the blade tightly.

[0044] Step 6: Mill the lower edge plate of the blade;

[0045] Step 7: First, turn the vise handle to loosen the blade edge plate, then turn the positioning handle to remove the blade.

[0046] The advantages of this invention are:

[0047] 1. This invention employs a movable center seat and a rotating jaw. The rotating jaw clamps the blade mating surfaces at different angles (two sides at an angle of β±γ) to radially position the blade. The movable center seat aligns the process datum for the rim plate machining with the design datum (C±s is the height difference between the upper rim plate and the dimensional datum, and D±t is the height difference between the upper and lower rim plates) to axially position the blade. This eliminates the defect of using a fixed-angle vise in the prior art that damages the blade, protects the two blade mating surfaces, ensures accurate positioning of the blade rim plate during machining, improves production efficiency, and increases yield.

[0048] 2. This invention is applicable to the clamping of various types of blades, such as steam turbine blades and centrifuge blades, and has a wide range of applications. Attached Figure Description

[0049] Figure 1 Axonometric view of the blade;

[0050] Figure 2 : Two-dimensional diagram of the blade;

[0051] Figure 3 : Axonometric drawing of this fixture;

[0052] Figure 4 : Axonometric drawing of this fixture;

[0053] Figure 5 : Front view of this fixture;

[0054] Figure 6 Top view of this fixture;

[0055] Figure 7 Axonometric drawing of a self-centering vise;

[0056] Figure 8 : A cross-sectional view of a self-centering vise;

[0057] Figure 9 Top view of a self-centering vise;

[0058] Figure 10 Three views of the base;

[0059] Figure 11 : Schematic diagram of the top plate;

[0060] Figure 12 : Structural diagram of the screw;

[0061] Figure 13 : Schematic diagram of the slide block;

[0062] Figure 14 : Schematic diagram of the guide rail structure;

[0063] Figure 15 : Three-view drawing and isometric drawing of the support component;

[0064] Figure 16 Top view of the clamping screw;

[0065] Figure 17 : A schematic diagram of the slider's structure;

[0066] Figure 18 Schematic diagram of the jaw seat structure;

[0067] Figure 19 : A schematic diagram of the jaws;

[0068] Figure 20 : Structural diagram of the clamp body;

[0069] Figure 21 : Schematic diagram of the positioning block;

[0070] Figure 22 : Schematic diagram of the screw positioning block.

[0071] In the diagram: 1-Base; 2-Self-centering vise; 3-Moving center; 4-Guide screw; 5-Center seat; 6-Screw; 7-Slide; 8-Guide rail; 9-Stop; 10-Support; 11-Handle; 12-Set screw; 13-Cylindrical pin; 14-Spring washer; 15-Hex bolt; 16-Hex nut; 17-Socket headstock screw; 18-Spring washer; 19-Hex nut; 20-Hex bolt; 21-Spring washer; 22-Hex bolt; 23-Spring washer; 24-Hex nut; 25-Eye bolt; 26-Cylindrical pin;

[0072] 101 - Channel steel; 102 - Flat plate;

[0073] 201-Clamping screw; 202-Slider; 203-Jaw seat; 204-Jaw pad; 205-Jaws; 206-Jaw body; 207-Fasting screw; 208-Locking block; 209-Screw plug; 210-Fixing center; 211-Screw positioning block; 212-Compression spring; 213-Cylindrical pin; 214-Hex socket head cap screw; 215-Set screw; 216-Countersunk screw;

[0074] 301 - Upper edge plate; 302 - Lower edge plate;

[0075] 401 - Channel steel; 402 - Flat plate. Detailed Implementation

[0076] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0077] like Figure 3 , Figure 4 , Figure 5 , Figure 6 The shown is a milling fixture for aero-engine blade rim plates, including a base 1, a self-centering vise and a movable positioning mechanism;

[0078] like Figure 10 As shown, the base 1 is a load-bearing carrier, welded from channel steel 101 and plate 102, used to install the self-centering vise and movable positioning mechanism. The self-centering vise and movable positioning mechanism are located at both ends of the base 1. Each end of the base is equipped with two eye bolts 25 for easy lifting operations.

[0079] like Figure 7 , Figure 8 , Figure 9 The self-centering vise shown includes a vise body 206, a positioning block 208, a clamping screw 201, a fixing center 210, and two jaw units;

[0080] like Figure 20As shown, the upper end face of the clamp body 206 is provided with a dovetail groove, and the middle of the dovetail groove is provided with a mounting hole for mounting the screw positioning block 211. The clamp body 206 is fixed on the base 1. Preferably, the bottom end of the clamp body 206 is provided with two pin holes and four threaded blind holes. The clamp body 206 is positioned by two cylindrical pins 13 and fixed to the base 1 by four hexagonal bolts 15. The heads of the four hexagonal bolts 15 are provided with spring washers 14.

[0081] like Figure 21 As shown, the lower end of the positioning block 208 is provided with a sliding groove that matches the dovetail groove, and the positioning block 208 is slidably fitted onto the clamp body 206 through the sliding groove; the positioning block 208 is provided with a fixed tip 210, and the front end face of the positioning block 208 is provided with a first through hole and a second through hole with increasing diameter.

[0082] A fixed tip 210 is disposed within the first through hole, with its tip extending beyond the front end face of the positioning block 208, ensuring that the fixed tip 210 slides along the dovetail groove with the positioning block 208. A compression spring 212 and a screw plug 209 are provided at the rear end of the fixed tip 210. The compression spring 212 and screw plug 209 are disposed within the second through hole, with both ends of the compression spring 212 contacting the fixed tip 210 and screw plug 209 respectively, allowing the fixed tip 210 to extend and retract within the positioning block 208, facilitating accurate blade positioning. The positioning block 208 has a threaded through hole for installing a fastening screw 207. The fastening screw 207 is installed within the positioning block 208, its head pressing against the end face of the dovetail groove, for tightening the positioning block 208 and the clamp body 206.

[0083] like Figure 16 As shown, the clamping screw 201 is located on the upper end face of the clamp body 206; the clamping screw 201 is a screw with both positive and negative threads, and the two ends of the clamping screw 201 are connected to two clamp jaw units simultaneously through the positive and negative threads.

[0084] like Figure 22 As shown, a screw positioning block 211 is fitted into the middle of the clamping screw 201; the upper end of the screw positioning block 211 mates with the middle of the clamping screw 201, and the lower end is located inside the clamping body 206, thus limiting the axial movement of the clamping screw 201. A vise handle is provided at the end of the clamping screw 201 that extends beyond the clamping body 206, facilitating the operator's control of the clamping screw 201.

[0085] like Figure 19 As shown, the jaw unit includes jaws 205, jaw pads 204, jaw seats 203, and sliders 202;

[0086] The jaw 205 is columnar, and the side end face of the jaw 205 includes a mounting surface and a mating surface; the cross-section of the jaw 205 in the length direction is an arc-shaped cross-section composed of the major arc and the chord of a circle, wherein the surface where the major arc of the circle is located is the mating surface that mates with the jaw seat 203, and the plane where the chord of the circle is located is the mounting surface for mounting the blade jaw pad 204.

[0087] The jaws 205 have a mating groove on their mating surface, and the jaw seat 203 has a set screw 215 for connecting the jaws 205. One end of the set screw 215 that extends beyond the end face of the jaw seat is set in the mating groove, which limits the rotation range of the jaws 205.

[0088] The jaw pad 204 is a rectangular pad, with one side mating with the mounting surface and the other side mating with the blade's contact surface; the mounting surface of the jaw 205 has two threaded blind holes for installing countersunk screws, and the jaw pad 204 has two corresponding countersunk through holes. The jaw pad 204 is installed on the mounting surface of the jaw 205 by two countersunk screws 216.

[0089] like Figure 18 As shown, the jaw seat 203 is cylindrical, and the front end of the jaw seat 203 mates with the mating surface of the jaw 205, ensuring that the jaw 205 can rotate within the jaw seat 203, so that the jaw pad 204 is fully in contact with the mating surface of the blade with error; the jaw seat 203 is fixed on the slider; preferably, both the jaw seat 203 and the slider 202 are provided with four corresponding threaded through holes and two pin holes, and the jaw seat 203 is positioned by two cylindrical pins 213 and fixed on the slider 202 by four internal hexagon screws 214.

[0090] like Figure 17 As shown, the lower end of the slider 202 is provided with a groove that matches the dovetail groove, and the slider 202 is slidably fitted onto the clamp body 206; the slider 202 is provided with a threaded through hole that matches the clamping screw 201, and the two ends of the clamping screw 201 are connected to two sliders, and the axial displacement of the two sliders 202 is controlled simultaneously by the positive thread and the negative thread.

[0091] The movable positioning mechanism includes a support 10, a center seat 5, a movable center 3, two guide rails 8, two slides 7, and two stops 9;

[0092] like Figure 15As shown, the support member 10 is welded from a channel steel 401 and a flat plate 402. The flat plate 402 is fixed to the base plate 1 by fasteners. Preferably, the flat plate 402 has four threaded through holes. The flat plate 402 is fixed to the base 1 by four sets of first hexagonal bolts. The first hexagonal bolt sets include hexagonal bolts 22, hexagonal nuts 24, and spring washers 23, which together ensure the fastening effect. The channel steel 401 is vertically welded to the flat plate 402. The back of the channel steel 401 is provided with two guide rails 8 and two stops 9. The back of the channel steel 401 is provided with ten mounting holes for mounting the guide rails 8, four mounting holes for mounting the stops 9, and a straight through hole for moving the screw 6.

[0093] like Figure 13 As shown, the bottom end of the slide 7 is provided with a groove that mates with the guide rail 8, such as... Figure 14 As shown, the guide rail 8 has five threaded blind holes, and the stop block 9 has two threaded through holes; Figure 6 As shown, the guide rail 8 is mounted on the back of the channel steel 401 of the support member 10 by screws; as Figure 5 As shown, the stop block 9 is installed on the back of the channel steel 401 of the support member 10 by means of a second bolt set; as Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the slide 7 is slidably mounted on the guide rail 8, ensuring that the movable tip 3 slides on the guide rail 8 with the slide 7. If it cannot slide, it will cause over-positioning. The second bolt group includes a hexagonal bolt 20, a hexagonal nut 19, and a spring washer 21, which together ensure the fastening effect. Two stops 9 are installed at both ends of the guide rail 8 to limit the slide 7. Preferably, the top of the slide 7 is provided with four threaded blind holes and two pin holes for mounting the tip seat 5.

[0094] like Figure 4 , Figure 5 , Figure 11 As shown, the center seat 5 includes a center seat mounting plate and a center post perpendicular to the mounting plate, with the center post fixed at the center of the mounting plate; the center seat mounting plate is fixed to two slides 7 by fasteners; preferably, the center seat mounting plate is provided with eight threaded through holes and two pin holes, the center seat mounting plate is positioned by two cylindrical pins 26 and mounted on the top surface of the two slides 7 by two eight internal hexagon screws 17, the head of the internal hexagon screws 17 is provided with a spring washer 18;

[0095] The center post of the center seat 5 has a center channel for installing the movable center 3. The movable center 3 passes through the support member 10 and the slide 7 and is set in the center channel. The tip of the movable center 3 extends out of the center post. The center post is provided with a guide screw 4. The center post has a threaded through hole for installing the guide screw 4 and is perpendicular to the center channel. The bottom end of the guide screw 4 contacts the side wall of the movable center 3. Preferably, the center post is a polygonal cubic post, and the guide screw 4 is set on one side end face of the tip of the cubic post. In order to ensure the fastening effect, a hexagonal nut 16 is provided on the guide screw 4.

[0096] The tail end of the active tip 3 is provided with a threaded blind hole for mounting the screw 6; such as Figure 12 As shown, the front end of the screw 6 is threadedly connected to the tail end of the movable center 3, and the rear end passes through the center seat 5, the slide 7, and the support 10 in sequence. Figure 6 As shown, a positioning handle 11 is provided at the rear end of the screw. The positioning handle 11 is fixed to the rear end of the screw by a set screw 12, which makes it easy for the operator to control the extension amount of the movable tip 3.

[0097] The method of clamping using the above-mentioned aero-engine blade edge milling fixture:

[0098] Step 1: Place the center holes at both ends of the blade onto the movable center 3 and the fixed center 210 of the clamp, respectively. Adjust the position of the fixed center 3 by sliding the positioning block 208 in the dovetail groove of the clamp body 206, and adjust the position of the movable center 210 by sliding the slide block 7 on the guide rail 8. This ensures that the positional relationship between the two centers adapts to the error changes of the actual blade dimensions A±m and B±n, thus completing the blade positioning. Since the actual dimensions of each blade are different, over-positioning will occur if the centers cannot slide.

[0099] Step 2: Rotate the positioning handle 11 to push out the movable tip 3, push the blade to retract the fixed tip 210, and make the blade edge plate fit against the end face of the positioning block;

[0100] Step 3: Rotate the vise handle to make the two jaw pads 204 fully contact the contact surface of the blade and clamp the blade.

[0101] Step 4: Mill the upper edge plate (or lower edge plate) of the blade;

[0102] Step 5: Rotate the vise handle to release the self-centering vise. After rotating the blade 180°, re-align the two jaw pads 204 with the contact surface of the blade and clamp the blade.

[0103] Step 6: Mill the lower edge plate (or upper edge plate) of the blade;

[0104] Step 7: First, turn the vise handle to loosen the blade edge plate, then turn the positioning handle 11 to remove the blade.

[0105] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the scope of the technology disclosed in the present invention, and such modifications or substitutions should all be covered within the scope of protection of the present invention.

Claims

1. A milling fixture for the blade rim of an aero-engine, characterized in that: Includes a base, a self-centering vise, and a movable positioning mechanism; The base is a load-bearing carrier used to install the self-centering vise and the movable positioning mechanism; The self-centering vise includes a vise body, a positioning block, a clamping screw, a fixing center, and two jaw units; The clamp body is fixedly mounted on the base; The positioning block is slidably mounted on the clamp body, and the positioning block is provided with a fixed tip, the tip of which extends beyond the end face of the positioning block. The clamping screw is located on the upper end face of the clamp body; the clamping screw is a screw with both positive and negative threads, and the two ends of the clamping screw are connected to two jaw units simultaneously through positive and negative threads, and the two jaw units clamp the two mating surfaces of the blade respectively; A screw positioning block is fitted in the middle of the clamping screw, and the screw positioning block is set in the clamp body to limit the axial movement of the clamping screw; The movable positioning mechanism includes a support, a slide, a center seat, and a movable center. The support member is fixed to the base; The slide is movably mounted on the support, and the top seat is fixed on the slide; The movable tip passes through the support and the slide, and is disposed inside the tip seat, with the tip of the movable tip extending beyond the end face of the tip seat; the tip seat is provided with guide screws for clamping the movable tip. The upper end face of the clamp body is provided with a dovetail groove, and the middle of the dovetail groove is provided with a mounting hole for installing the screw positioning block; The lower end of the positioning block is provided with a sliding groove that matches the dovetail groove, and the positioning block can be slidably fitted into the clamp body.

2. The milling fixture for aero-engine blade rim plates according to claim 1, characterized in that: The positioning block has a first through hole and a second through hole with increasing diameter on its front end face; the fixing point is disposed in the first through hole; the rear end of the fixing point is provided with a compression spring and a screw plug; the compression spring and the screw plug are disposed in the second through hole, and the two ends of the compression spring contact the fixing point and the screw plug respectively.

3. The milling fixture for aero-engine blade rim plates according to claim 1, characterized in that: The positioning block is equipped with screws, and the screw heads are pressed against the end face of the dovetail groove.

4. The milling fixture for aero-engine blade rim plates according to claim 1, characterized in that: The jaw unit includes jaws, jaw pads, jaw seats, and sliders; The jaws are cylindrical, and the side end faces of the jaws include a mounting surface and a mating surface; The cross-section of the jaws is an arc-shaped cross-section composed of the major arc and the chord of a circle, wherein the surface containing the major arc of the circle is the mating surface, and the plane containing the chord of the circle is the mounting surface. The jaw pad is a rectangular pad that mates with the mounting surface; the mounting surface has multiple threaded blind holes for mounting countersunk screws, and the jaw pad is mounted on the jaws by countersunk screws; The jaw seat is cylindrical, and the front end of the jaw seat mates with the mating surface of the jaws; the jaw seat is fixed on the slider, and the lower end of the slider is provided with a groove that mates with the dovetail groove, and the slider is slidably fitted into the jaw body; The slider is provided with a threaded through hole that mates with the clamping screw. The clamping screw is connected to two jaw units at both ends, and the axial displacement of the jaw units is controlled simultaneously.

5. The milling fixture for aero-engine blade rim plates according to claim 4, characterized in that: The jaws have a mating groove on their mating surface, and the jaw seat has a set screw for connecting the jaws. One end of the set screw that extends beyond the end face of the jaw seat is located in the mating groove.

6. The milling fixture for aero-engine blade rim plates according to claim 4, characterized in that: The support is fixed to the base with screws; the support is provided with two guide rails and two stops, and the front end face of the support is provided with multiple mounting holes for mounting the guide rails and stops; There are two slide blocks, each with a groove at its bottom that mates with a guide rail, and the slide blocks are slidably mounted on the guide rail; the two stops are installed at both ends of the guide rail to limit the movement of the slide blocks. The center seat includes a center seat mounting plate and a center column perpendicular to the mounting plate; the center seat mounting plate is fixed on two slides; The center post has a center channel for installing a movable center, and the tip of the movable center extends out of the center seat; the center post has a guide screw perpendicular to the center channel, and the center seat has a threaded through hole for installing the guide screw, and the bottom end of the guide screw contacts the side wall of the movable center. The tail end of the movable tip is provided with a threaded blind hole for installing a screw; the front end of the screw is threadedly connected to the tail end of the movable tip, and the rear end passes through the tip seat, slide and support in sequence.

7. The milling fixture for aero-engine blade rim plates according to claim 6, characterized in that: The clamping screw has a vise handle at one end extending beyond the vise body; The screw has a positioning handle at its rear end.

8. The milling fixture for aero-engine blade rim plates according to claim 1, characterized in that: The base is equipped with multiple eye bolts.

9. A method of milling an air engine blade shroud using the fixture of claim 7, wherein, Includes the following steps: Step 1: Place the center holes at both ends of the blade onto the movable and fixed centers of the clamp, respectively. Adjust the position of the fixed center by sliding the positioning block in the dovetail groove of the clamp body, and adjust the position of the movable center by sliding the slide block on the guide rail. Make the position relationship of the two centers adapt to the error changes of the actual blade size A±m and B±n, and complete the blade positioning. Step 2: Rotate the positioning handle to push out the movable center point, push the blade to retract the fixed center point, and make the blade edge plate fit against the end face of the positioning block; Step 3: Rotate the vise handle to make the two jaw pads fully contact the blade and clamp the blade. Step 4: Mill the upper edge plate of the blade; Step 5: Rotate the vise handle to loosen the vise. After rotating the blade 180°, re-align the two jaw pads with the blade's contact surface and clamp the blade tightly. Step 6: Mill the lower edge plate of the blade; Step 7: First, turn the vise handle to loosen the blade edge plate, then turn the positioning handle to remove the blade.

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