Clamping device and machining center for counter-pull hole machining of outer duct stator blade

Abstract

The invention discloses a clamping device and a machining center for counter-pull hole machining of an outer duct stator blade, the clamping device comprises a blade body serving as a blade main body, a large end plate and a small end plate are mounted at the two ends of the blade body respectively, and the clamping device comprises a bottom plate; the bottom cushion block is mounted on the bottom plate and supported on the bottom surfaces of the large end plate and the small end plate; the upper pressing plate is located above the blade, and force is downwards applied to the upper pressing plate through the downward pressing assembly, so that the upper pressing plate is tightly pressed on the top faces of the large end plate and the small end plate; the positioning blocks are mounted on the bottom plate at intervals left and right, and are supported and positioned on the front side surfaces of the large end plate and the small end plate through the side cushion blocks; the side pressing assembly is tightly pressed on the rear side surfaces of the large end plate and the small end plate; the inner side positioning assembly and the outer side positioning assembly are respectively pressed on the left side surface and the right side surface of the large end plate in a point contact manner; therefore, reliable and accurate positioning and clamping of the blade are achieved, the problems of cutter vibration, displacement or deformation and the like in the machining process are effectively reduced or even avoided, high-precision machining of a machining center is matched, and the machining precision and the machining efficiency are greatly improved and guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of outer casing stator blades, in particular to a clamping device and a machining center for machining reverse drawing holes of outer casing stator blades. Background Art

[0002] In the precision manufacturing field of the engine manufacturing industry, as an indispensable component, the manufacturing precision and quality of outer casing stator blades directly affect the overall performance, operation stability and service life of the engine. Especially for the reverse drawing holes of outer casing stator blades, the reverse drawing hole is an important aerodynamic optimization structure in outer casing stator blades. Due to the small aperture size and extremely high requirements for dimensional accuracy and surface quality, it has always been a technical bottleneck and challenge in the manufacturing process.

[0003] In the prior art, the machining method for reverse drawing holes on outer casing stator blades mainly relies on reverse scrapers or angle head milling cutters for machining, and this method has significant defects. On the one hand, it is difficult to ensure the consistency and stability of machining accuracy, and it is easy to leave defects such as vibration marks and scratches on the surface of the reverse drawing holes, seriously affecting the aerodynamic performance of the blades. On the other hand, the lack of workpiece positioning and clamping technology is also a major shortcoming of the existing traditional machining methods. During the machining process, the workpiece is prone to displacement or deformation, further exacerbating the decline in machining accuracy. Summary of the Invention

[0004] To solve the above problems, the present invention provides a clamping device and a machining center for machining reverse drawing holes of outer casing stator blades with a reasonable structure, so as to realize reliable and accurate positioning and clamping of the blades, effectively reduce or even avoid problems such as chatter, displacement or deformation during machining, match the high-precision machining of the machining center, and greatly improve and guarantee machining accuracy and machining efficiency.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A clamping device for machining reverse drawing holes of outer casing stator blades, the outer casing stator blade includes a blade body as the blade main body, and a large end plate and a small end plate are respectively installed at both ends of the blade body. The clamping device includes:

[0007] A bottom plate;

[0008] A bottom cushion block: installed on the bottom plate and supported on the bottom surfaces of the large end plate and the small end plate;

[0009] An upper pressing plate: located above the blade, and a downward pressing component applies a downward force to the upper pressing plate, so that the upper pressing plate presses on the top surfaces of the large end plate and the small end plate;

[0010] Positioning blocks: installed on the bottom plate at intervals left and right, and positioned on the front side surfaces of the large end plate and the small end plate through side cushion blocks;

[0011] Side pressing assembly: Press tightly against the rear sides of the large end plate and the small end plate;

[0012] Inner positioning assembly and outer positioning assembly: Respectively use point contact to press tightly against the left side and the right side of the large end plate.

[0013] As a further improvement of the above technical solution:

[0014] The inner positioning assembly includes a first baffle and a second baffle that are installed at intervals up and down on the inner side of the positioning block. An inner positioning screw is locked through the first baffle and the second baffle, and the end of the inner positioning screw abuts against the inner side of the large end plate;

[0015] The outer positioning assembly includes a support plate installed on the bottom cushion block. An outer positioning screw is locked through the support plate, and the end of the outer positioning screw abuts against the outer side of the large end plate.

[0016] The ends of the inner positioning screw and the outer positioning screw facing the large end plate are both processed into convex spherical surfaces, and the contact with the large end plate constitutes point contact.

[0017] Two bottom cushion blocks are arranged at intervals left and right, and the heights of the two bottom cushion blocks respectively match the height support requirements of the corresponding large end plate and small end plate.

[0018] Two groups of downward pressing assemblies are provided, and respectively press downward at both ends of the upper pressing plate.

[0019] The structure of a single group of downward pressing assemblies is: including a double-headed screw vertically installed on the bottom plate or the positioning block. A flat pressing plate and a nut are sequentially installed on the upper part of the double-headed screw. The end of the flat pressing plate extends above the upper pressing plate, and the nut is screwed relative to the double-headed screw to urge the flat pressing plate to press tightly against the top surface of the upper pressing plate.

[0020] The side of the positioning block facing the blade is set as an inclined surface, and a side cushion block is fitted and installed on the inclined surface, and the side cushion block is closely attached to the front side of the large end plate or the small end plate.

[0021] The side pressing assembly includes two groups that respectively press tightly against the large end plate and the small end plate;

[0022] The structure of a single group of side pressing assemblies is: including an auxiliary block installed on the bottom plate. The upper part of the auxiliary block is inclined towards the blade to form an inclined part, and a side pressing plate is installed on the inner side of the inclined part; it also includes a pressing screw for adjusting the installation position of the side pressing plate relative to the inclined part.

[0023] A groove penetrating through both ends is opened on the inclined part of the auxiliary block. The side pressing plate is of a T-shaped structure, and the end of the side pressing plate forms an insertion part. A T-shaped groove is opened on the insertion part. The insertion part is slidably fitted into one end of the groove, and an auxiliary pressing plate is installed on the auxiliary block at the other end of the groove; the pressing screw is provided with a T-shaped end fitted into the T-shaped groove, and the pressing screw and the auxiliary pressing plate are fitted through a through hole.

[0024] A machining center, the machining center being a horizontal machining center, includes a workbench, on which a clamping device for machining the reverse drawing holes of the outer stator blades described in any one of the above is installed, and the blade is clamped and fixed by the clamping device; it also includes a tool, and the tool is installed on the tool holder of the machining center after passing through the reverse drawing holes on the large end plate of the blade.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] Through the bottom cushion block, upper pressure plate, positioning block, side pressing assembly, inner side positioning assembly and outer side positioning assembly, the present invention realizes reliable and accurate positioning and clamping of the blade in all directions of front-back, up-down, and left-right, effectively reducing or even avoiding problems such as tool chatter, displacement or deformation during machining, matching the high-precision machining of the machining center, and greatly improving and ensuring machining accuracy and machining efficiency.

[0027] The present invention also has the following advantages:

[0028] The inner side positioning assembly and the outer side positioning assembly are pressed against the large end plate in a point contact form. While realizing the positioning of the blade in the left-right direction, it meets the limiting requirements of the non-planar side of the large end plate. The point contact effectively ensures the reliability of the abutting limit.

[0029] The positioning block constitutes the positioning of the blade on the clamping device. Combined with the side cushion block, it effectively ensures the correct position of the blade during machining; the side cushion block and the side pressing assembly are combined to realize the restriction of the degree of freedom of the blade in the relative position.

[0030] The bottom cushion block supporting the blade below ensures uniform and stable support for the blade, avoiding blade deformation or displacement caused by insufficient support. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of the blade of the present invention.

[0032] Figure 2 It is a schematic structural diagram of the clamping device of the present invention.

[0033] Figure 3 It is a schematic structural diagram of the clamping device from a side view angle of the present invention.

[0034] Figure 4 It is a schematic structural diagram of the clamping device from another side view angle of the present invention.

[0035] Figure 5 It is a schematic positioning diagram of the inner side positioning assembly, outer side positioning assembly and blade of the present invention.

[0036] Figure 6 It is a positioning schematic diagram from another perspective.

[0037] Figure 7 This is a schematic structural view of the auxiliary block of the present invention.

[0038] Figure 8 This is a schematic structural view of the side pressing plate of the present invention.

[0039] Figure 9 This is a schematic view of the position of the anti-pull hole on the blade of the present invention.

[0040] Figure 10 This is a schematic view of the assembly of the tool passing through the blade of the present invention.

[0041] Wherein: 1. bottom plate; 2. inner positioning assembly; 3. positioning block; 4. bottom cushion block; 5. outer positioning assembly; 6. auxiliary block; 7. downward pressing assembly; 8. blade; 9. upper pressing plate; 10. tool;

[0042] 21. first baffle; 22. second baffle; 23. inner positioning screw;

[0043] 31. side cushion block;

[0044] 51. outer positioning screw;

[0045] 61. side pressing plate; 62. auxiliary pressing plate; 63. pressing screw; 601. groove; 611. insertion part; 612. T-shaped groove;

[0046] 71. nut; 72. flat pressing plate; 73. double-headed screw;

[0047] 81. blade body; 82. large end plate; 83. small end plate; 84. anti-pull hole;

[0048] 91. abutting block. Specific embodiments

[0049] The following will describe the specific embodiments of the present invention with reference to the accompanying drawings.

[0050] The clamping device for machining the anti-pull hole of the outer casing stator blade in this embodiment is as Figure 1 shown. The outer casing stator blade includes a blade body 81 as the blade 8, and a large end plate 82 and a small end plate 83 are respectively installed at both ends of the blade body 81, as Figure 2 , Figure 3 and Figure 4As shown in the figure, the clamping device includes: a bottom plate 1; a bottom cushion block 4: installed on the bottom plate 1 and supported on the bottom surfaces of the large end plate 82 and the small end plate 83; an upper pressing plate 9: located above the blade 8, and a downward pressing component 7 applies a downward force to the upper pressing plate 9, so that the upper pressing plate 9 presses tightly on the top surfaces of the large end plate 82 and the small end plate 83; positioning blocks 3: installed on the bottom plate 1 at intervals left and right, and positioned on the front side surfaces of the large end plate 82 and the small end plate 83 through the support of side cushion blocks 31; a side pressing component: pressing tightly on the rear side surfaces of the large end plate 82 and the small end plate 83; an inner positioning component 2 and an outer positioning component 5: respectively pressing tightly on the left side surface and the right side surface of the large end plate 82 in a point contact manner.

[0051] In this embodiment, through the bottom cushion block 4, the upper pressing plate 9, the positioning blocks 3, the side pressing component, as well as the inner positioning component 2 and the outer positioning component 5, reliable and precise positioning and clamping of the blade 8 in all directions of front-back, up-down, and left-right are achieved, effectively reducing or even avoiding problems such as chatter, displacement, or deformation during processing.

[0052] In this embodiment, the inner positioning component 2 and the outer positioning component 5 press tightly on the large end plate 82 in a point contact form. While achieving the positioning of the blade 8 in the left-right direction, it meets the limit requirements for the non-planar side surface of the large end plate 82, and the reliability of the abutting limit is effectively ensured by the point contact.

[0053] In this embodiment, the positioning of the blade 8 on the clamping device is formed by the positioning blocks 3. Combined with the side cushion blocks 31, the correct position of the blade 8 during processing is effectively ensured; the combination of the side cushion blocks 31 and the side pressing component realizes the limitation of the degree of freedom of the blade 8 in the relative position.

[0054] In this embodiment, the bottom cushion block 4 supporting below the blade 8 ensures uniform and stable support for the blade 8, avoiding deformation or displacement of the blade 8 caused by insufficient support.

[0055] The inner positioning component 2 includes a first baffle 21 and a second baffle 22 installed at intervals up and down on the inner side surface of the positioning block 3. As Figure 5 and Figure 6 shown, an inner positioning screw 23 is locked through the first baffle 21 and the second baffle 22, and the end of the inner positioning screw 23 abuts against the inner side surface of the large end plate 82.

[0056] In this embodiment, the first baffle 21 and the second baffle 22 are respectively positioned and locked on the inner side surface of the positioning block 3 by using inner hexagon screws and cylindrical pins; the inner hexagon screws are locked on the positioning block 3 after passing through the through holes of the first baffle 21 and the second baffle 22.

[0057] The outer positioning component 5 includes a support plate installed on the bottom cushion block 4, and an outer positioning screw 51 is locked through the support plate, and the end of the outer positioning screw 51 abuts against the outer side surface of the large end plate 82.

[0058] In this embodiment, the support plate has an L-shaped structure. The lower part of the support plate is locked to the outer side of the bottom cushion block 4 by a through hexagon socket head screw, and the outer positioning screw 51 is locked through from the outside to the inside of the upper part of the support plate. By setting the support plate as an L-shaped structure, the inner end of the outer positioning screw 51 can have sufficient movement space to reliably abut against the outer side of the large end plate 82.

[0059] The ends of the inner positioning screw 23 and the outer positioning screw 51 facing the large end plate 82 are both processed into convex spherical surfaces, and the abutment with the large end plate 82 constitutes point contact, which is effectively applicable to the reliable contact with the arc surface on the blade 8.

[0060] In this embodiment, by rounding the ends of the inner positioning screw 23 and the outer positioning screw 51, the precise positioning of the large end plate 82 of the blade 8 is realized, ensuring the position accuracy during processing.

[0061] In this embodiment, according to the three-point positioning principle, three inner positioning screws 23 can be abutted and arranged on the inner side of the large end plate 82, and two outer positioning screws 51 are arranged on the outside of the large end plate 82 to ensure the reliability and accuracy of the positioning of the blade 8 by the cooperation of the inner positioning assembly 2 and the outer positioning assembly 5, and avoid over-positioning.

[0062] There are two bottom cushion blocks 4 arranged at intervals left and right. The heights of the two bottom cushion blocks 4 respectively match the height support requirements of the corresponding large end plate 82 and small end plate 83, realizing the uniform and stable support for the blade 8, effectively resisting the vibration and impact force generated during the chip removal process, and ensuring the smoothness of the processing process.

[0063] At the same time, the two bottom cushion blocks 4 can also absorb a part of the chip removal force and vibration, effectively reducing the wear and damage to the blade 8 and the processing equipment, helping to extend the service life of the blade 8 and the processing equipment, and reducing the maintenance cost.

[0064] There are two sets of downward pressing assemblies 7, which respectively press downward at both ends of the upper pressing plate 9, effectively ensuring the uniformity and stability of the downward pressing force on the blade 8.

[0065] In this embodiment, according to actual needs, abutting blocks 91 can be installed at the end parts of the bottom surface of the upper pressing plate 9 to ensure that the upper pressing plate 9 can reliably press downward on both ends of the blade 8 when pressing downward.

[0066] The structure of a single set of downward pressing assembly 7 is: including a double-headed screw 73 vertically installed on the bottom plate 1 or the positioning block 3. A flat pressing plate 72 and a nut 71 are successively installed on the upper part of the double-headed screw 73. The end of the flat pressing plate 72 extends above the upper pressing plate 9, and the nut 71 is screwed relative to the double-headed screw 73 to urge the flat pressing plate 72 to press downward on the top surface of the upper pressing plate 9.

[0067] In this embodiment, by rotating the nut 71, the flat pressing plate 72 can apply pressure to the upper pressing plate 9 from top to bottom, realizing the pressing of the upper pressing plate 9 on the upper part of the blade 8. The operation is simple and convenient, and the pressing and loosening of the flat pressing plate 72 on the upper pressing plate 9 can be quickly realized, effectively improving the processing efficiency. At the same time, through the pressing of the upper pressing plate 9 on the blade 8, the rigidity of the blade 8 during the processing is effectively enhanced, enabling it to better resist the external force during processing and reducing or even avoiding deformation or damage during processing.

[0068] In this embodiment, the upper pressing plate 9 applies force to press the blade 8 from top to bottom, and the appropriate downward pressure ensures the fixation of the blade 8 relative to the bottom plate 1 to ensure the stability and reliability of the blade 8 during processing. At the same time, the setting of the upper pressing plate 9 can also prevent the blade 8 from vibrating or displacing due to uneven force during processing, reducing the vibration marks and defects generated on the surface of the reverse reaming hole of the blade 8 after processing.

[0069] In this embodiment, a long oval hole through which the double-headed screw 73 penetrates upward can be opened on the flat pressing plate 72 to facilitate the adjustment of the flat pressing plate 72 relative to the double-headed screw 73 along the length direction of the long oval hole, thereby adjusting the pressing contact area, position, etc. of the flat pressing plate 72 on the upper pressing plate 9.

[0070] The side surface of the positioning block 3 facing the blade 8 is set as an inclined surface, and a side cushion block 31 is fitted and installed on the inclined surface, and the side cushion block 31 is in close contact with the front side surface of the large end plate 82 or the small end plate 83.

[0071] In this embodiment, the hexagon socket head screw passes through the side cushion block 31 and is locked to the inclined surface of the positioning block 3. A counterbore for accommodating the hexagon socket head screw is opened on the side cushion block 31, and the side cushion block 31 is in contact with the front side surface of the blade 8 for positioning.

[0072] In this embodiment, the positioning block 3 is firmly installed on the bottom plate 1 by hexagon socket head screws and cylindrical pins to form a stable support structure, effectively ensuring the processing stability of the blade 8 and preventing displacement or deformation.

[0073] The side pressing assembly includes two groups that respectively press on the large end plate 82 and the small end plate 83. The structure of a single group of side pressing assemblies is as follows: it includes an auxiliary block 6 installed on the bottom plate 1. The upper part of the auxiliary block 6 is inclined towards the blade 8 to form an inclined part, and a side pressing plate 61 is installed on the inner side surface of the inclined part. It also includes a pressing screw 63, and the installation position of the side pressing plate 61 relative to the inclined part is adjusted by the pressing screw 63 to realize the adjustment of the pressing degree.

[0074] In this embodiment, the side pressing assembly is matched with the positioning block 3 to realize the limit on the front and rear side surfaces of the blade 8, effectively simplifying the operation difficulty and operation steps, and helping to improve the processing efficiency.

[0075] In this embodiment, the inclination angles of the upper inclined surfaces of the positioning blocks 3 and the inclined parts in the side pressing components are respectively consistent with the inclination angles of the front and rear side surfaces of the large end plate 82 and the small end plate 83, effectively ensuring close contact and realization and guarantee of the precise positioning and position accuracy of the blade 8, and reducing the machining errors caused by factors such as positioning.

[0076] As Figure 7 and Figure 8 shown, a through groove 601 is formed in the inclined part of the auxiliary block 6, the side pressing plate 61 is of a T-shaped structure, the end part of the side pressing plate 61 forms an insertion part 611, a T-shaped groove 612 is formed in the insertion part 611, the insertion part 611 is slidably fitted into one end of the groove 601, and an auxiliary pressing plate 62 is installed on the auxiliary block 6 at the other end of the groove 601; a pressing screw 63 is provided with a T-shaped end part fitted into the T-shaped groove 612, and the pressing screw 63 and the auxiliary pressing plate 62 are fitted through a through hole.

[0077] In this embodiment, by rotating the pressing screw 63, the side pressing plate 61 can be made to move along the length direction of the groove 601 with the fitting of the insertion part 611 and the groove 601 as the guide, so as to adjust the position of the side pressing plate 61 relative to the auxiliary block 6 and realize the adjustment of the pressing degree of the side pressing plate 61 on the blade 8.

[0078] In this embodiment, the T-shaped end part of the end of the pressing screw 63 is a structure in which a nut is threadedly fitted, the nut is limited and clamped in the T-shaped groove 612, and when the pressing screw 63 rotates, it moves axially relative to the nut, so as to drive the side pressing plate 61 to move along the groove 601 for adjustment through the nut.

[0079] In this embodiment, the nut can be a T-shaped nut with a cross section adapted to the T-shaped groove 612, or other shaped nuts, or the nut is fixed in the T-shaped groove 612 by welding or the like, as long as the relative fixation of the nut relative to the T-shaped groove 612 can be realized, so that the adjustment of the pressing direction can be realized through the rotation of the pressing screw 63 and the nut fitted by thread.

[0080] The machining center of this embodiment is a horizontal machining center, including a workbench, on which a clamping device for machining the reverse drawing holes of the outer casing stator blades in any one of the above is installed, and the blade 8 is clamped and fixed by the clamping device; it also includes a tool 10, as Figure 9 and Figure 10 shown, the tool 10 is installed on the tool holder of the machining center after passing through the reverse drawing hole 84 on the large end plate 82 of the blade 8.

[0081] In this embodiment, the reverse drawing hole 84 is located on the upper edge plate (i.e., the large end plate 82) of the blade 8, and the two reverse drawing holes 84 are respectively located on both sides of the inner back arc of the air passage.

[0082] In this embodiment, considering the stable and reliable clamping of the blade 8 by the clamping device, especially the effective and reliable fixation at the large end plate 82, a machining center can be used to perform reverse reaming on the blade 8, effectively reducing production costs and ensuring surface roughness and machining accuracy.

[0083] The present invention realizes reliable and precise positioning and clamping of the blade, effectively reducing or even avoiding problems such as tool chatter, displacement, or deformation during machining, matching the high-precision machining of the machining center, and greatly improving and ensuring machining accuracy and machining efficiency.

[0084] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0085] The above description is an explanation of the present invention, not a limitation of the invention. For the scope defined by the present invention, refer to the claims. Within the protection scope of the present invention, any form of modification can be made.

Claims

1. A clamping device for reverse hole drawing of an outer stator blade, the outer stator blade comprising a sheet body (81) as the main body of the blade (8), a large end plate (82) and a small end plate (83) are respectively installed at both ends of the sheet body (81), characterized in that: The clamping device comprises: Bottom plate (1); Bottom pad (4): mounted on the bottom plate (1), supported on the bottom surface of the large end plate (82) and the small end plate (83); upper pressure plate (9): located above the blade (8), with the lower pressure assembly (7) applying downward force to the upper pressure plate (9), so that the upper pressure plate (9) is pressed tightly against the top surface of the large end plate (82) and the small end plate (83); Positioning blocks (3): installed on the bottom plate (1) at intervals on the left and right, and supported and positioned on the front side surfaces of the large end plate (82) and the small end plate (83) via side pads (31); Side pressure assembly: pressed tightly against the rear side surfaces of the large end plate (82) and the small end plate (83); The inner positioning assembly (2) and the outer positioning assembly (5) are respectively pressed against the left side and the right side of the large end plate (82) by point contact.

2. The clamping device for reverse hole processing of outer stator blades according to claim 1, characterized in that: The inner positioning assembly (2) comprises a baffle plate 1 (21) and a baffle plate 2 (22) which are installed on the inner side surface of the positioning block (3) at an interval from top to bottom, and an inner positioning screw (23) is locked through the baffle plate 1 (21) and the baffle plate 2 (22), and the end of the inner positioning screw (23) abuts against the inner side surface of the large end plate (82); The outer positioning assembly (5) comprises a support plate mounted on the bottom pad (4), through which an outer positioning screw (51) is locked and installed, and the end of the outer positioning screw (51) abuts against the outer side surface of the large end plate (82).

3. The clamping device for reverse hole processing of outer stator blades according to claim 2, characterized in that: The ends of the inner positioning screw (23) and the outer positioning screw (51) facing the large end plate (82) are processed into convex spherical surfaces, and the abutment with the large end plate (82) forms point contact.

4. The clamping device for reverse hole processing of outer stator blades according to claim 1, characterized in that: Two bottom pads (4) are arranged at intervals on the left and right, and the heights of the two bottom pads (4) are respectively matched to the height support requirements of the corresponding large end plate (82) and the small end plate (83).

5. The clamping device for reverse hole processing of outer stator blades according to claim 1, characterized in that: The downward pressing assembly (7) is provided with two groups, which respectively apply downward pressure to the two end portions of the upper pressing plate (9).

6. The clamping device for reverse hole processing of outer stator blades according to claim 1 or 5, characterized in that: The structure of the single-group downward pressing assembly (7) is as follows: it includes a double-headed screw (73) vertically mounted on the bottom plate (1) or the positioning block (3), a flat pressing plate (72) and a nut (71) are sequentially mounted on the upper part of the double-headed screw (73), the end of the flat pressing plate (72) extends above the upper pressing plate (9), and the nut (71) is screwed relative to the thread of the double-headed screw (73) to cause the flat pressing plate (72) to be pressed downward against the top surface of the upper pressing plate (9).

7. The clamping device for reverse hole processing of outer stator blades according to claim 1, characterized in that: The side surface of the positioning block (3) facing the blade (8) is arranged as an inclined surface, and a side pad (31) is fitted on the inclined surface, and the side pad (31) is tightly fitted to the front side surface of the large end plate (82) or the small end plate (83).

8. The clamping device for reverse hole processing of outer stator blades according to claim 1, characterized in that: The side pressure assembly includes two groups respectively pressed against the large end plate (82) and the small end plate (83); The structure of the single-group side pressure assembly is as follows: it includes an auxiliary block (6) installed on a base plate (1), the upper part of the auxiliary block (6) is inclined toward the blade (8) to form an inclined portion, and a side pressure plate (61) is installed on the inner side of the inclined portion; it also includes a clamping screw (63), and the clamping screw (63) is used to adjust the installation position of the side pressure plate (61) relative to the inclined portion.

9. The clamping device for reverse hole processing of outer stator blades according to claim 7, characterized in that: The auxiliary block (6) has a groove (601) with two ends passing through it on the inclined portion, the side pressure plate (61) is a T-shaped structure, the end of the side pressure plate (61) constitutes an insertion portion (611), and the insertion portion (611) is provided with a T-shaped slot (612). The insertion portion (611) is slidably fitted into one end of the groove (601), and the auxiliary pressure plate (62) is installed on the auxiliary block (6) located at the other end of the groove (601); the clamping screw (63) is provided with a T-shaped end fitted into the T-shaped slot (612), and the clamping screw (63) and the auxiliary pressure plate (62) are fitted through the through hole.

10. A machining center, characterized in that: The machining center is a horizontal machining center, including a workbench, on which is installed a clamping device for processing the reverse pulling holes of the outer stator blades according to any one of claims 1 to 9, and the blades (8) are clamped and fixed by the clamping device; and also includes a tool (10), which passes through the reverse pulling hole (84) on the large end plate (82) of the blade (8) and is then installed on the tool handle of the machining center.

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