Three-center self-centering rotary clamp for blade machining

Abstract

The utility model discloses a three-center self-centering rotary clamp for blade machining, and relates to the technical field of blade machining. The utility model aims to solve the problem that the machining quality of the blade is difficult to guarantee due to the fact that the positioning surface and the centre hole of each blade cannot be completely consistent in machining and a rotary clamp needs to be adjusted in each clamping when the blade is machined in the prior art. The clamp comprises a clamp body, a double-end stud, a center seat, a middle center, two side centers, two clamping sliding blocks and two center adjusting mechanisms, the two clamping sliding blocks are oppositely arranged on the upper end face of a boss, the lower ends of the clamping sliding blocks are inserted in a sliding groove and connected with the sliding groove in a sliding mode, the center seat is fixedly connected in a positioning groove, and the center adjusting mechanisms are arranged on the center seat. The positioning ends of the middle tip and the two side tips are vertically inserted in the middle of the upper end face of the tip base, the side tips are symmetrically arranged on the two sides of the middle tip respectively, and lifting adjustment of the side tips is achieved at the lower ends of the side tips through tip adjusting mechanisms. The blade clamping device is used for clamping in blade machining.

Description

Technical Field

[0001] The utility model relates to the technical field of blade processing, in particular to a three-center self-centering rotary clamp used for blade processing. Background Art

[0002] Blades are the core components of steam turbines, and the processing quality of moving blades becomes a key factor in the quality of steam turbines, which directly affects the output power of steam turbines. In order to improve the efficiency of blade processing, blades are processed from blanks with ejector holes and process tables to the finished state except for the root tooth shape on a five-axis machine tool. Since the depth of the ejector hole of each blank blade cannot be guaranteed to be consistent, and the size of the process step is not completely consistent, the previous rotary fixture is clamped for the radial process surface and end surface positioning back radial process surface of the blade root, and the ejector hole of the blade crown is positioned and clamped. Since the positioning surface and ejector hole processing of each blade cannot meet the complete consistency, the rotary fixture needs to be adjusted each time it is clamped, resulting in the difficulty in ensuring the processing quality of the blade. The blade is now processed by clamping the ejector hole of the root and crown of the blade to position the process step surface, which can ensure the consistency of the processing of each blade. Therefore, a set of rotary fixtures with stable positioning, adjustable ejector and automatic centering when clamping is designed to solve the key factors to improve the processing efficiency and quality of moving blades. Utility Model Content

[0003] The utility model aims to solve the problem that in the existing blade processing, the positioning surface and the ejector pin hole of each blade cannot be processed completely consistent, and the rotary clamp needs to be adjusted each time it is clamped, which makes it difficult to ensure the processing quality of the blade. A three-center self-centering rotary clamp for blade processing is proposed.

[0004] The technical solution adopted by the utility model to solve the above technical problems is:

[0005] A three-center self-centering rotary clamp for blade processing comprises a clamping body, a stud, a center seat, an intermediate center, two side centers, two clamping slides and two center adjustment mechanisms, the clamping body is fixedly connected to a machine tool connecting plate at the rotation center of the machine tool, a boss is provided in the middle part of the upper end surface of the clamping body, the two clamping slides are relatively arranged on the upper end surface of the boss, a slide groove and a positioning groove are respectively opened in the radial direction on the upper end surface of the boss, the slide groove and the positioning groove are vertically arranged, the lower end of the clamping slide is inserted in the slide groove and is slidably connected to the slide groove, the stud is arranged in the slide groove, the lower end of each clamping slide is threadedly connected to a threaded section of the stud, the center seat is fixedly connected in the positioning groove, the positioning ends of the intermediate center and the two side centers are respectively vertically inserted in the middle part of the upper end surface of the center seat, the side centers are respectively symmetrically arranged on both sides of the intermediate center, and the lower end of the side center is adjusted by the center adjustment mechanism to realize the lifting and lowering adjustment of the side center.

[0006] Furthermore, the axis of the middle tip is coaxially arranged with the axis of the clamp body.

[0007] Furthermore, the two thread sections of the stud are both trapezoidal threads, and the ends of the stud are provided with hexagonal nuts.

[0008] Furthermore, an adjustable jaw assembly is provided on the upper portion of the inner end surface of the clamping slider.

[0009] Furthermore, the adjustable jaw assembly includes a jaw and a plurality of hexagon socket adjustment screws, a jaw positioning groove is provided on the upper portion of the inner end surface of the clamping slider, the jaw is horizontally arranged in the jaw positioning groove, a plurality of hexagon socket adjustment screws are evenly distributed on the upper portion of the rear end surface of the jaw along the length direction, a plurality of screw positioning step holes are evenly distributed on the upper portion of the outer end surface of the clamping slider along the length direction, the screw positioning step holes are respectively arranged in one-to-one correspondence with the hexagon socket adjustment screws, the nut of the hexagon socket adjustment screw is arranged in the large hole of the screw positioning step hole, and the threaded end of the hexagon socket adjustment screw passes through the small hole of the screw positioning step hole and is threadedly connected to the rear end surface of the jaw.

[0010] Furthermore, a toothed clamping surface is provided on the front end surface of the jaws.

[0011] Furthermore, the center adjustment mechanism includes a wedge block and a hexagon socket adjustment bolt, and sliding grooves are respectively provided on both sides of the lower end surface of the center seat along the length direction. The wedge block is arranged in the sliding groove and is slidably connected along the length direction of the sliding groove. Threaded blind holes are provided on the lower parts of the end surfaces on both sides of the center seat, and the threaded blind holes are communicated with the upper part of the outer end of the sliding groove. The hexagon socket adjustment bolt is threadedly connected to the threaded blind holes, and the inner end of the hexagon socket adjustment bolt is rotatably connected to the rear part of the wedge block. The upper end surface of the front part of the wedge block is provided with an upper inclined surface arranged downward from the outside to the inside along the length direction, and the middle part of the lower end surface of the side center is provided with a lower inclined surface arranged downward from the outside to the inside along the radial direction, and the lower inclined surface is slidably connected to the upper inclined surface.

[0012] Furthermore, a limiting ring groove is provided on the outer circumferential side wall of the inner end of the hexagonal adjusting bolt, an inwardly concave connecting arc surface is provided on the upper end surface of the rear part of the wedge block, a limiting convex ring is provided on the arc surface behind the connecting arc surface, the lower part of the inner end of the hexagonal adjusting bolt cooperates with the connecting arc surface, and the limiting ring groove is mounted on the outside of the limiting convex ring.

[0013] Furthermore, the top seat is fixedly connected to the bottom of the positioning groove by means of a cylindrical pin and a connecting screw.

[0014] Furthermore, the clamp body is fixedly connected to a machine tool connecting plate at a rotation center of the machine tool by means of set screws.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model provides a three-point self-centering rotary clamp for blade processing, which improves the processing efficiency and quality of moving blades, can achieve stable positioning, adjustable ejector pins, and fast and reliable clamping. The rotary clamp can automatically center when clamping, ensuring the consistent direction and accuracy of each moving blade after processing, thereby ensuring the efficiency and quality of blade processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the front view of the blade blank in the utility model;

[0018] Figure 2 yes Figure 1 Left view of

[0019] Figure 3 yes Figure 1 Bottom view of

[0020] Figure 4 It is a front sectional view of the overall structure of the utility model;

[0021] Figure 5 It is a top view of the overall structure of the utility model;

[0022] Figure 6 It is a side sectional view of the overall structure of the utility model;

[0023] Figure 7 It is a front view of the clamp body 1 in the utility model;

[0024] Figure 8 It is a top view of the clamp body 1 in the utility model;

[0025] Fig. 9 It is a left side view of the clamp body 1 of the utility model;

[0026] Fig.10 It is a front view of the stud 2 in the utility model;

[0027] Fig.11 It is a front cross-sectional view of the clamping slider 3 in the utility model;

[0028] Fig.12 It is a right view of the clamping slider 3 in the utility model;

[0029] Fig.13 It is a cross-sectional view of the jaw 8 in the utility model;

[0030] Fig.14 It is a rear side end view of the jaw 8 in the utility model;

[0031] Fig.15 It is a top view of the jaws 8 of the utility model;

[0032] Fig.16 It is a front cross-sectional view of the top seat 4 in the utility model;

[0033] Fig.17 It is a top view of the top seat 4 in the utility model;

[0034] Fig.18 It is a bottom view of the top seat 4 in the utility model;

[0035] Fig.19 It is a side view of the top seat 4 in the utility model;

[0036] Fig. 20 This is a front view of the center top 6 of the utility model;

[0037] Fig.21 It is a side view of the side top 6 of the utility model;

[0038] Fig. 22 It is a front view of the hexagon socket adjusting bolt 12 in the utility model;

[0039] Fig.23 It is a front cross-sectional view of the wedge block 7 in the utility model;

[0040] Fig.24 It is a right side view of the wedge block 7 in the utility model. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0042] Specific implementation method 1: Combination Figures 1 to 24The present embodiment is described. The present embodiment describes a three-center self-centering rotary fixture for blade processing, which includes a clamp body 1, a stud 2, a center seat 4, an intermediate center 5, two side centers 6, two clamping slide blocks 3 and two center adjustment mechanisms. The clamp body 1 is fixedly connected to a machine tool connection plate at the center of the machine tool rotation. A boss 101 is provided in the middle of the upper end surface of the clamp body 1. Two clamping slide blocks 3 are relatively arranged on the upper end surface of the boss 101. A slide groove 102 and a positioning groove 103 are respectively opened on the upper end surface of the boss 101 in the radial direction. The slide groove 12 It is arranged vertically with respect to the positioning groove 103, and the lower end of the clamping slider 3 is inserted in the slide groove 102 and is slidably connected with the slide groove 102, the stud 2 is arranged in the slide groove 102, and the lower end of each clamping slider 3 is threadedly connected with a threaded section of the stud 2, and the top seat 4 is fixed in the positioning groove 103, and the positioning ends of the middle top 5 and the two side tops 6 are respectively vertically inserted in the middle of the upper end surface of the top seat 4, and the side tops 6 are respectively symmetrically arranged on both sides of the middle top 5, and the lower end of the side top 6 realizes the lifting and lowering adjustment of the side top 6 through the top adjustment mechanism.

[0043] In order to improve the processing efficiency and quality of moving blades, the processing technology is set to process 3 ejector holes on the root end face of the blade blank and 1 ejector hole on the crown end face, and ensure that the ejector hole in the middle of the blade root and the ejector hole of the blade crown are on the radial line, and the ejector holes on both sides of the blade root are on the circle centered on the radial line and on the center line of the blade root. When processing the blade, the ejector hole of the blade crown is positioned and tightened with the ejector provided by the machine tool, and a set of rotary fixtures that can automatically center when positioning and clamping the top hole of the blade root is designed. Ensure the consistency and accuracy of each moving blade after processing to ensure the efficiency and quality of blade processing.

[0044] A positioning platform is provided in the middle of the lower end surface of the clamp body 1 for connection and positioning with the machine tool connection plate. According to the blade blank drawing, a set of rotary clamps with three tops is designed. The middle top 5 ensures that the positioning platform connected to the machine tool connection plate is concentric, ensuring that the middle top 5 is on the center line of the machine tool rotation. The left and right side tops 6 are on the same straight line as the middle top 5 and the distance from the middle top is A=B / 2, and the left and right side tops 6 are adjusted in the direction of the machine tool rotation center line through the wedge block 7 and the hexagon socket adjustment bolt 12 to adjust the extension height to ensure that the three tops are fully in contact with the top hole of the blade root at the same time. At the same time, the stud 2 is rotated to slide the clamping sliders 3 on the left and right sides to drive the jaws 8 to clamp the process step of the blade. The clamping surface of the jaws 8 is designed as a toothed structure, which can ensure that the toothed jaws 8 completely bite the process step of the blade root when clamping, and the clamping sliders 3 on the left and right sides can slide freely in the U-shaped slide 102 of the clamp body when clamping, playing a role of automatic centering.

[0045] Specific implementation method 2: Combination Figures 1 to 24To explain this embodiment, the axis of the middle tip 5 in this embodiment is coaxially arranged with the axis of the clamp body 1. The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0046] Specific implementation method three: Combination Figures 1 to 24 To explain this embodiment, the two thread sections of the stud 2 described in this embodiment are both trapezoidal threads, and a hexagonal nut is provided at the end of the stud 2. The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0047] The trapezoidal thread can realize rapid movement of the clamping slides 3 on both sides.

[0048] Specific implementation method four: Combination Figures 1 to 24 To explain this embodiment, an adjustable jaw assembly is provided on the upper portion of the inner end surface of the clamping slide block 3. The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0049] Specific implementation method five: Combination Figures 1 to 24 This embodiment is described. The adjustable jaw assembly described in this embodiment includes a jaw 8 and a plurality of hexagon socket adjustment screws 9. A jaw positioning groove 10 is provided on the upper portion of the inner end surface of the clamping slider 3. The jaw 8 is horizontally arranged in the jaw positioning groove 10. A plurality of hexagon socket adjustment screws 9 are evenly distributed along the length direction on the rear end surface of the jaw 8. A plurality of screw positioning stepped holes 11 are evenly distributed along the length direction on the upper portion of the outer end surface of the clamping slider 3. The screw positioning stepped holes 11 are respectively arranged in one-to-one correspondence with the hexagon socket adjustment screws 9. The nut of the hexagon socket adjustment screw 9 is arranged in the large hole of the screw positioning stepped hole 11. The threaded end of the hexagon socket adjustment screw 9 passes through the small hole of the screw positioning stepped hole 11 and is threadedly connected with the rear end surface of the jaw 8. The undisclosed technical features in this embodiment are the same as those in the fourth embodiment.

[0050] In this embodiment, by rotating the hexagon socket adjustment screw 9, the jaws 8 can be moved linearly, and the jaws 8 clamp the process step of the blade root in position.

[0051] Specific implementation method six: Combination Figures 1 to 24 To explain this embodiment, the front end surface of the jaw 8 of this embodiment is provided with a toothed clamping surface 801. The undisclosed technical features of this embodiment are the same as those of the fifth embodiment.

[0052] The clamping surface of the jaws 8 is designed to be a toothed structure, which can ensure that the toothed jaws 8 completely bite the process step of the blade root during clamping.

[0053] Specific implementation method seven: Combination Figures 1 to 24The present embodiment is described. The center adjustment mechanism of the present embodiment comprises a wedge block 7 and a hexagon socket adjustment bolt 12. The two sides of the lower end surface of the center seat 4 are provided with sliding grooves 401 respectively along the length direction. The wedge block 7 is arranged in the sliding grooves 401 and is slidably connected along the length direction of the sliding grooves 401. The lower part of the two side end surfaces of the center seat 4 is provided with threaded blind holes 402, which are connected to the upper part of the outer end of the sliding groove 401. The hexagon socket adjustment bolt 12 is threadedly connected to the threaded blind holes 402. The inner end of the hexagon socket adjustment bolt 12 is rotatably connected to the rear part of the wedge block 7. The upper end surface of the front part of the wedge block 7 is provided with an upper inclined surface 701 which is inclined downward from the outside to the inside along the length direction. The middle part of the lower end surface of the side center 6 is provided with a lower inclined surface 601 which is inclined downward from the outside to the inside along the radial direction. The lower inclined surface 601 is slidably connected to the upper inclined surface 701. The technical features not disclosed in the present embodiment are the same as those in the first embodiment.

[0054] Rotating the hexagonal adjusting bolt 12 can adjust the wedge block 7 to move along the length direction of the sliding groove 401. The upper inclined surface 701 on the wedge block 7 cooperates with the lower inclined surface 601 of the side tip 6, thereby adjusting the extension height of the side tip 6 to ensure that the three tips are fully in contact with the blade root tip hole at the same time.

[0055] Specific implementation method eight: Combination Figures 1 to 24 To explain this embodiment, a limiting annular groove 1201 is provided on the outer circumferential side wall of the inner side end of the hexagon socket adjusting bolt 12 in this embodiment, a concave connecting arc surface 702 is provided on the upper end surface of the rear part of the wedge block 7, a limiting convex ring 703 is provided on the arc surface behind the connecting arc surface 702, the lower part of the inner side end of the hexagon socket adjusting bolt 12 matches the connecting arc surface 702, and the limiting annular groove 1201 is sleeved on the outside of the limiting convex ring 703. The technical features not disclosed in this embodiment are the same as those in the specific embodiment seven.

[0056] This design enables the inner end of the hexagon socket adjusting bolt 12 to be rotatably connected to the rear portion of the wedge block 7 .

[0057] Specific implementation method nine: Combination Figures 1 to 24 To explain this embodiment, the top seat 4 in this embodiment is fixedly connected to the bottom of the positioning groove 103 by means of a cylindrical pin 13 and a connecting screw 14. The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0058] Specific implementation method ten: Combination Figures 1 to 24 To explain this embodiment, the clamp body 1 of this embodiment is fixedly connected to the machine tool connection plate of the machine tool rotation center by means of a set screw 15. The undisclosed technical features of this embodiment are the same as those of the first embodiment.

[0059] The method for using the three-center self-centering rotary fixture for blade processing comprises the following steps:

[0060] Fix the clamp body 1 on the machine tool connection plate using the positioning table and positioning pin hole of the machine tool rotation center and tighten it with the set screw 15; assemble the stud 2 and the two clamping slide blocks 3, note that the threaded section of the stud 2 is assembled with the threaded clamping slide block 3 and assembled together into the U-shaped slide groove 102 of the clamp body 1; put the middle top 5 and the two side tops 6 into the top seat 4, connect the hexagon socket adjustment bolt 12 with the top seat 4, assemble the wedge block 7 into the groove of the lower inclined surface 601 of the side top 6, and assemble it with the limiting ring groove 1201 of the hexagon socket adjustment bolt 12; put the top seat 4 into the positioning groove 103 of the clamp body 1, position and tighten it with the cylindrical pin 13 and the connecting screw 14, and ensure that the middle top 5 is concentric with the boss 101 of the clamp body 1 during assembly; the jaws 8 are respectively installed in the jaw positioning grooves 10 of the clamping slide block 3, and tightened with the hexagon socket adjustment screw 9. Place the ejector hole at the root end of the blade into the top of the assembled rotary fixture, tighten the top of the blade crown to make the top on the radial line fully contact with the ejector hole, then adjust the hexagonal adjustment bolt 12 to make the left and right side tops 6 also fully contact with the ejector hole to complete the positioning of the blade, adjust the stud 2 to make the toothed clamping surface 801 of the jaws 8 bite into the process step surface of the blade root, so that the blade is completely fixed to the rotary fixture and the radial line of the blade is on the rotary center line of the machine tool. The zero reference line of the blade blank can be used as the tool reference for the machine tool during processing.

[0061] The method for processing a blade using the three-center self-centering rotary fixture for blade processing comprises the following steps:

[0062] Step 1: Connect the assembled rotary fixture to the machine tool connection plate, use the positioning table and positioning pins to position it and tighten it with set screws 15.

[0063] Step 2: Install the blade blank so that the tip of the blade crown and the middle tip 5 on the radial line are fully in contact with and tightened with the corresponding ejector holes, and then adjust the hexagonal adjusting bolt 12 so that the left and right side tips 6 are also fully in contact with and tightened with the left and right ejector holes of the blade root to complete the positioning of the blade.

[0064] Step 3: Adjust the stud 2 so that the teeth of the jaws 8 bite into the process step surface of the blade root. Since the clamping slider 3 can slide on the slide groove 102, the blade can be completely fixed to the rotary fixture and the radial line of the blade can be on the rotary center line of the machine tool.

[0065] Step 4: Use the zero reference line of the blade blank as the tool reference of the machine tool, and call in the processing program to process the blade root intermediate, blade steam channel, tie rod boss, blade crown and other processes.

[0066] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A three-center self-centering rotary fixture for blade processing, characterized in that: The invention comprises a clamp body (1), a stud (2), a center center seat (4), an intermediate center center (5), two side centers (6), two clamping slide blocks (3) and two center center adjustment mechanisms. The clamp body (1) is fixedly connected to a machine tool connecting plate at the rotary center of the machine tool. A boss (101) is provided in the middle of the upper end surface of the clamp body (1). The two clamping slide blocks (3) are arranged on the upper end surface of the boss (101) in a relative manner. A slide groove (102) and a positioning groove (103) are respectively provided on the upper end surface of the boss (101) in a radial direction. The slide groove (102) and the positioning groove (103) are arranged vertically. The clamping slide blocks are arranged on the upper end surface of the boss (101). The lower end of the clamping slide block (3) is inserted into the slide groove (102) and is slidably connected to the slide groove (102). The stud bolt (2) is arranged in the slide groove (102). The lower end of each clamping slide block (3) is threadedly connected to a threaded section of the stud bolt (2). The top seat (4) is fixed in the positioning groove (103). The positioning ends of the middle top seat (5) and the two side top seats (6) are vertically inserted in the middle of the upper end surface of the top seat (4). The side top seats (6) are symmetrically arranged on both sides of the middle top seat (5). The lower end of the side top seat (6) is adjusted by the top seat adjustment mechanism to realize the lifting and lowering of the side top seat (6).

2. A three-center self-centering rotary fixture for blade processing according to claim 1, characterized in that: The axis of the middle tip (5) is coaxially arranged with the axis of the clamp body (1).

3. The three-center self-centering rotary fixture for blade processing according to claim 1, characterized in that: The two thread sections of the stud bolt (2) are both trapezoidal threads, and the ends of the stud bolt (2) are provided with hexagonal nuts.

4. The three-center self-centering rotary fixture for blade processing according to claim 1, characterized in that: An adjustable jaw assembly is provided on the upper portion of the inner end surface of the clamping slide block (3).

5. A three-center self-centering rotary fixture for blade processing according to claim 4, characterized in that: The adjustable jaw assembly comprises a jaw (8) and a plurality of hexagon socket adjustment screws (9); a jaw positioning groove (10) is provided on the upper portion of the inner end surface of the clamping slider (3); the jaw (8) is horizontally arranged in the jaw positioning groove (10); a plurality of hexagon socket adjustment screws (9) are evenly distributed along the length direction on the rear end surface of the jaw (8); a plurality of screw positioning stepped holes (11) are evenly distributed along the length direction on the upper portion of the outer end surface of the clamping slider (3); the screw positioning stepped holes (11) are respectively arranged in one-to-one correspondence with the hexagon socket adjustment screws (9); the nut of the hexagon socket adjustment screw (9) is arranged in the large hole of the screw positioning stepped hole (11); the threaded end of the hexagon socket adjustment screw (9) passes through the small hole of the screw positioning stepped hole (11) and is threadedly connected with the rear end surface of the jaw (8).

6. A three-center self-centering rotary fixture for blade processing according to claim 5, characterized in that: A toothed clamping surface (801) is provided on the front end surface of the jaw (8).

7. The three-center self-centering rotary fixture for blade processing according to claim 1, characterized in that: The center adjustment mechanism comprises a wedge block (7) and a hexagon socket adjustment bolt (12). The two sides of the lower end surface of the center seat (4) are respectively provided with sliding grooves (401) along the length direction. The wedge block (7) is arranged in the sliding groove (401) and is slidably connected along the length direction of the sliding groove (401). The lower part of the two side end surfaces of the center seat (4) is provided with a threaded blind hole (402). The threaded blind hole (402) is connected to the upper part of the outer end of the sliding groove (401). The angle adjustment bolt (12) is threadedly connected to the threaded blind hole (402), the inner side end of the hexagon socket adjustment bolt (12) is rotatably connected to the rear of the wedge block (7), the upper end surface of the front part of the wedge block (7) is provided with an upper inclined surface (701) arranged to be inclined downward from the outside to the inside along the length direction, and the middle part of the lower end surface of the side tip (6) is provided with a lower inclined surface (601) arranged to be inclined downward from the outside to the inside along the radial direction, and the lower inclined surface (601) is slidably connected to the upper inclined surface (701).

8. A three-center self-centering rotary fixture for blade machining according to claim 7, characterized in that: A limiting annular groove (1201) is provided on the outer circumferential side wall of the inner end of the hexagon socket adjusting bolt (12); an inner concave connecting arc surface (702) is provided on the upper end surface of the rear part of the wedge block (7); a limiting convex ring (703) is provided on the arc surface behind the connecting arc surface (702); the lower part of the inner end of the hexagon socket adjusting bolt (12) cooperates with the connecting arc surface (702), and the limiting annular groove (1201) is sleeved on the outside of the limiting convex ring (703).

9. The three-center self-centering rotary fixture for blade processing according to claim 1, characterized in that: The top seat (4) is fixedly connected to the bottom of the positioning groove (103) via a cylindrical pin (13) and a connecting screw (14).

10. The three-center self-centering rotary fixture for blade processing according to claim 1, characterized in that: The clamp body (1) is fixedly connected to a machine tool connecting plate at the rotary center of the machine tool via a set screw (15).

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