Milling clamp and clamping method for end face of bending and twisting supporting plate of diffusion section assembly

Abstract

The invention discloses a milling clamp for the end face of a bending and twisting supporting plate of a diffusion section assembly and a clamping method. The milling clamp comprises a bottom plate, a supporting block, a lower support, a lower compression screw, a lower cover plate, a positioning ring, an upper support, a pressing plate, a connecting plate, a fixed positioning pin, a locking nut, a central stand column, an upper lifting bolt, a base, a cover plate, a movable handle compression screw, a lower insert, an upper insert and an adjusting support. During milling and clamping, the upper side face, the lower side face and the bottom face of the bending and twisting supporting plate are supported in an auxiliary mode, the deformation problem of the inner ring and the bending and twisting supporting plate is avoided, the rigidity of the bending and twisting supporting plate is improved, and the problems that in a common clamping mode, part deformation is large, and vibration exists in the machining process are solved. The two positioning spigots are adopted for positioning the inner circle faces of the large outer diameter end and the small outer diameter end of the inner ring in the axial direction, milling machining is conducted on the end face of the bending and twisting supporting plate under the simulated assembling condition, the machined bending and twisting supporting plate can be smoothly assembled on the inner molded face of the outer ring, and the assembling clearance requirement is effectively met.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, specifically relating to a milling fixture and clamping method for the end face of the bending and twisting support plate of a diffuser section component. Background Technology

[0002] The diffuser assembly is an important component of the engine, such as... Figure 1 As shown, the assembly consists of an inner ring 1, an outer ring, and multiple bending and twisting support plates 2. During assembly, the inner ring 1 and the multiple bending and twisting support plates 2 are first assembled together to form a component, which is then assembled into the inner surface of the outer ring. Because the inner ring 1 and the outer ring are thin-walled parts, the parts undergo some deformation after machining, preventing the component from being smoothly assembled into the inner surface of the outer ring. One solution is to leave a certain machining allowance on the end face of the bending and twisting support plates 2, assemble the inner ring 1 and the bending and twisting support plates 2 together, and then mill the end face of the bending and twisting support plates 2. Because the inner ring 1 and the torsion support plate 2 are connected by screws, and the radial dimension of the torsion support plate 2 is large, milling using common clamping methods results in significant deformation of the part during clamping, severe vibration during machining, and substandard end face dimensions of the machined torsion support plate. Manual grinding of the end face of the torsion support plate 2 is still required, which is time-consuming, labor-intensive, and inefficient. It also cannot guarantee that the assembly clearance between the end face of the torsion support plate 2 and the inner surface of the outer ring is less than 0.05mm. During test runs, the engine speed is high, and a large assembly clearance between the torsion support plate 2 and the outer ring can easily cause vibration and even detachment, posing safety hazards. Therefore, it is necessary to design a suitable milling fixture to solve the problems existing in the machining of the torsion support plate 2, thereby obtaining a torsion support plate 2 that meets the requirements, ultimately satisfying the assembly clearance requirements, and ensuring the engine's test performance. Summary of the Invention

[0003] This invention aims to provide a milling fixture and clamping method for the end face of the bending and twisting support plate of the diffuser section component, overcoming the milling difficulties of the inner ring and multiple bending and twisting support plates after assembly into a component in the prior art, solving the problems of large deformation of the parts during milling and large vibration during processing, and ultimately solving the technical problem of not being able to meet the assembly gap between the end face of the bending and twisting support plate and the inner surface of the outer ring.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A milling fixture for the end face of the bending and torsion support plate of a diffuser section assembly, comprising: The base plate has multiple sliding grooves distributed on different radial lines of the same circumference, and the number of sliding grooves is the same as the number of bending and twisting support plates. The support block has its lower end slidably connected to the groove in the base plate, and its upper end has an inclined surface for supporting the lower end face of the bending and torsion support plate. Lower support, the lower support is installed on the upper end surface of the bottom plate, and one lower support is arranged between any two adjacent sliding grooves, the upper end of the lower support is slidably connected with a lower insert block, the sliding direction of the lower insert block is along the radial line of another circumferential line concentric with the circumferential line where the sliding groove is located, and two opposite side surfaces of the lower insert block form a support surface supporting the side surface of the bending and torsion support plate respectively; Pressing plate, the pressing plate is arranged in parallel above the bottom plate, the pressing plate is connected with the bottom plate through the center column, and the lower end surface of the pressing plate is provided with a positioning stop for the large-diameter end of the inner ring in the axial direction; Upper support, the upper support is installed on the lower end surface of the pressing plate, a plurality of upper supports are distributed on different radial lines of the same circumferential line of the pressing plate, and the number of the upper supports is consistent with the number of the lower supports, the lower end of the upper support is slidably connected with an upper insert block, the sliding direction of the upper insert block is consistent with the radial line where the upper support is located, and two opposite side surfaces of the upper insert block form a support surface supporting the side surface of the bending and torsion support plate respectively; Positioning ring, the positioning ring is arranged on the upper end surface of the bottom plate and is located inside the plurality of supporting blocks and the plurality of lower supports at the same time, and the upper end surface of the positioning ring is provided with a positioning stop for the small-diameter end of the inner ring in the axial direction.

[0005] As an option, the lower end of the supporting block penetrates the sliding groove and is connected with the cover plate to form a sliding structure with a I-shaped cross section, wherein the upper end and the lower end of the I-shaped cross section are located above the upper end surface and below the lower end surface of the sliding groove respectively, and the middle of the I-shaped cross section is located in the sliding groove.

[0006] As an option, the outer side of each supporting block is provided with a movable handle compression screw for pushing the supporting block to slide along the sliding groove.

[0007] As an option, the milling clamp for the end surface of the bending and torsion support plate of the diffuser section assembly further comprises: Through groove, the through groove penetrates the upper and lower end surfaces of the lower insert block; Protrusion, the protrusion is arranged on the upper end surface of the lower support, and the protrusion is connected with the lower cover plate after penetrating the through groove of the lower insert block; Lower compression screw, one end of the lower compression screw is threadedly connected to the protrusion after penetrating the lower insert block, so as to drive the lower insert block to slide relative to the lower support; Second rubber pad, the second rubber pad is respectively assembled on the surfaces of the two support surfaces of the lower insert block.

[0008] As an option, the milling clamp for the end surface of the bending and torsion support plate of the diffuser section assembly further comprises: I-shaped sliding rail, the I-shaped sliding rail is located at the lower end of the upper support; Semi-closed groove, the semi-closed groove is arranged on the upper insert block, and the upper insert block is inserted into the I-shaped sliding rail through the opening of the semi-closed groove; A first rubber pad is respectively assembled on the surface of the two supporting surfaces of the upper insert; An upper pressing screw is screwed with the upper support through the upper insert to drive the upper insert to slide relative to the upper support.

[0009] Alternatively, the milling fixture for the end surface of the bend-twist support plate of the diffuser assembly further comprises a base, the base is an annular member and is installed on the upper end surface of the base plate and is located inside the plurality of supporting blocks and the plurality of lower supports, a positioning ring is installed on the upper end of the base, the lower end of the center column is connected with the base plate through the base, and the upper end of the center column is connected with the pressing plate through the connecting plate.

[0010] Alternatively, the upper end of the center column is provided with a locking nut, and the pressing plate is pressed between the locking nut and the connecting plate.

[0011] Alternatively, the milling fixture for the end surface of the bend-twist support plate of the diffuser assembly further comprises an upper lifting ring screw and a lower lifting ring screw, the upper lifting ring screw is installed on the pressing plate, and the lower lifting ring screw is installed on the base plate.

[0012] A milling fixture for the end surface of the bend-twist support plate of the diffuser assembly, a plurality of bend-twist support plates are assembled on the outer surface of the inner ring to form a component, and the milling fixture comprises: Clamping of the inner ring, the inner ring is placed with the small-diameter axial end downward and the large-diameter axial end upward, and a pressing force is applied to the small-diameter axial end and the large-diameter axial end of the inner ring along the axial direction of the inner ring; Clamping of the bend-twist support plate, an upward supporting force is applied to the lower end of each bend-twist support plate, and a supporting force is applied to the side surface of the bend-twist support plate between the side surfaces of every two adjacent bend-twist support plates, one of the supporting forces is close to the upper end of the side surface of the bend-twist support plate, the other is close to the lower end of the side surface of the bend-twist support plate, and all the supporting forces corresponding to the upper end of the side surface of the bend-twist support plate are in the same plane, and all the supporting forces corresponding to the lower end of the side surface of the bend-twist support plate are in another plane, the two planes are parallel to each other and perpendicular to the axis of the inner ring.

[0013] Alternatively, the milling fixture is used, and the method comprises the following steps: Step 1, after the pressing plate is removed, the milling fixture is hoisted to the milling machine workbench, the positioning ring is aligned with the center of the milling machine workbench, and then the milling fixture is fixed on the milling machine workbench; Step 2, the inner ring and the bend-twist support plate assembled into one are put into the milling fixture until the small-diameter axial end of the inner ring enters the positioning stop of the positioning ring; Step 3, the pressing plate is pressed downward on the large-diameter axial end of the inner ring until the large-diameter axial end of the inner ring enters the positioning stop of the pressing plate; Step 4: Select any two adjacent bending and twisting support plates, and slide the upper and lower inserts respectively, so that the two support surfaces of the upper insert just contact the upper end of the side surface of the two bending and twisting support plates, and at the same time, the two support surfaces of the lower insert just contact the lower end of the side surface of the two bending and twisting support plates, and then fix the pressure plate. Step 5: Use a dial indicator to check the end face of the bending and torsion support plate to obtain an initial reading. Then, continue to slide the upper and lower inserts respectively, so that the two support surfaces of the upper and lower inserts continue to apply support force to the side surface of the bending and torsion support plate. Then slide the support block so that the inclined surface of the support block supports the lower end face of the bending and torsion support plate. Observe the change of the dial indicator reading and ensure that it is not greater than the set value. Then, take either of the two bending and torsion support plates as the starting position, select the other adjacent bending and torsion support plate and repeat step 5 until the support of the remaining bending and torsion support plates is completed. Step 6: After confirming that all bending and torsion support plates have been supported, begin milling the end faces of the bending and torsion support plates until the end face milling of all bending and torsion support plates is completed.

[0014] Compared with the prior art, the present invention has the following characteristics: (1) The present invention provides auxiliary support for the upper side, lower side and bottom of the bending and twisting support plate respectively, avoiding problems such as deformation of the inner ring and the bending and twisting support plate, improving the rigidity of the bending and twisting support plate, and solving the problem of large deformation of parts and vibration during processing caused by commonly used clamping methods. (2) The present invention uses two positioning stops to position the inner circular surfaces of the large and small outer diameter ends of the inner ring, and performs milling on the end face of the bending and twisting support plate under simulated assembly conditions. The processed bending and twisting support plate can be smoothly assembled onto the inner surface of the outer ring, effectively ensuring the assembly gap requirements, and has a wide range of application value. (3) The milling process of the present invention is only performed on the end face of the bending and twisting support plate after the upper insert, lower insert and support block have supported the bending and twisting support plate. The upper insert, lower insert and support block are removed only after all the support plates have been processed to meet the requirements, which ensures the consistency of the gap during subsequent assembly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the assembly of the inner ring and the bending and torsion support plate in this invention; Figure 2 This is a schematic diagram of the milling fixture for the end face of the bending and twisting support plate in this invention. Figure 3 This is a top view of the milling fixture for the end face of the bending and twisting support plate in this invention; Figure 4 for Figure 3 View AA, half-section schematic diagram; Figure 5 This is a schematic diagram of the fixture base plate and support block structure in this invention; Figure 6This is a schematic diagram of the lower insert support structure in this invention; Figure 7 This is a schematic diagram of the upper insert support structure in this invention; Figure 8 This is a schematic diagram of the bending and twisting support plate being clamped in the milling fixture in this invention; Figure 9 This is a schematic diagram illustrating the working principle of the upper insert, the second type B pinch handle, and the upper clamping screw in this invention. In the diagram: 1. Inner ring; 2. Bending and twisting support plate; 3. Base plate; 4. Lower eyelet screw; 5. Support block; 6. Lower bracket; 7. Lower clamping screw; 8. Lower cover plate; 9. First B-type handle; 10. First screw; 11. Positioning ring; 12. Second screw; 13. Upper bracket; 14. Third screw; 15. Pressure plate; 16. Connecting plate; 17. First bushing; 18. Positioning pin; 19. Second bushing; 20. Open washer; 21. Locking nut; 22. Central column; 23. Upper eyelet screw; 24. Fourth screw; 25. Base; 26. Cover plate; 27. Movable handle clamping screw; 28. First rubber pad; 29. ​​Fifth screw; 30. Upper clamping screw; 31. Second rubber pad; 32. Sixth screw; 33. Lower insert; 34. Upper insert; 35. Adjusting support; 36. Seventh screw; 37. Second B-type handle. Detailed Implementation

[0016] The present invention will be further described below with reference to specific embodiments, but it should not be construed as limiting the scope of the subject matter of the present invention to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0017] like Figures 2-9 As shown, this invention provides a milling fixture for the end face of the bending and twisting support plate of a diffuser section assembly. The milling fixture includes a base plate 3, a lower eyelet screw 4, a support block 5, a lower bracket 6, a lower clamping screw 7, a lower cover plate 8, a first B-type handle 9, a first screw 10, a positioning ring 11, a second screw 12, an upper bracket 13, a third screw 14, a pressure plate 15, a connecting plate 16, a first bushing 17, a fixed positioning pin 18, a second bushing 19, an open washer 20, a locking nut 21, a central column 22, an upper eyelet screw 23, a fourth screw 24, a base 25, a cover plate 26, a movable handle clamping screw 27, a first rubber pad 28, a fifth screw 29, an upper clamping screw 30, a second rubber pad 31, a sixth screw 32, a lower insert 33, an upper insert 34, an adjusting support 35, a seventh screw 36, and a second B-type handle 37.

[0018] The base plate 3 has multiple grooves and screw holes in the circumferential direction. The support block 5 is set in the groove of the base plate 3. The support block 5 and the cover plate 2 are connected by the seventh screw 36 to form an "I" shaped structure. The adjusting support 35 is fixed to the base plate 3 by the fifth screw 29. The movable handle clamping screw 27 passes through the threaded hole on the adjusting support 35 and connects to the support block 5. Rotating the movable handle clamping screw 27 causes the support block 5 to slide radially along the groove, so that the inclined surface of the support block 5 supports the lower end face of the bending and twisting support plate 2. Multiple lower inserts 33 support structures are set on the base plate 3. The lower bracket 6 is fixed to the base plate 3 by the sixth screw 32. A square through groove is set on the lower insert 33. The lower cover plate 8 is connected to the lower bracket 6 by the first screw 10. The second rubber pads 31 are attached to both sides of the lower insert 33. The lower clamping screw 7 passes through the stepped hole on the lower insert 33 and connects to the upper protrusion of the lower bracket 6. Figure 6 The lower bracket 6 has a cubic protrusion at its upper end connected by a threaded hole. Rotating the lower clamping screw 7 allows the lower insert 33 to slide radially, enabling the second rubber pads 31 on both sides of the lower insert 33 to support the lower ends of the two sides of the bending and torsion support plate 2. The base 25 is fixed to the base plate 3 by screws. Figure 5 The upper surface of the base 25 is provided with a positioning ring 11 and a central column 22, which are fixedly connected by screws. The upper end of the positioning ring 11 is provided with a positioning stop for the inner circular surface of the small diameter end of the inner ring 1. The upper end of the central column 22 has a stepped surface, on which a connecting plate 16 is provided and fixedly connected by screws. The pressure plate 15 is provided on the connecting plate 16, and a fixed positioning pin 18 is provided on the connecting plate 16 for positioning the pressure plate 15 on the connecting plate 16. A second bushing 19 is provided between the pressure plate 15 and the central column 22. The pressure plate 15 is also provided with a first bushing 17 and a positioning stop. The positioning stop is used to support the inner circular surface of the large diameter end of the inner ring 1. Multiple upper inserts 34 are provided on the lower end face of the pressure plate 15. The upper end of the upper bracket 13 is connected to the pressure plate 15 by a third screw 14, and the lower end is provided with an "I" shaped structure. The upper insert 34 is provided with a semi-closed groove. The two sides of the upper insert 34 are attached with first rubber pads 28. The upper clamping screw 30 passes through the stepped hole on the upper insert 34 and connects to the threaded hole of the upper bracket 13. Rotating the upper clamping screw 30 allows the upper insert 34 to slide radially, so that the first rubber pads 28 on both sides of the upper insert 34 support the upper ends of the two sides of the bending and torsion support plate 2. An open washer 20 and a locking nut 21 are also provided on the upper end of the central column 22 for pressing the pressure plate 15 and fixing it to the connecting plate 16.

[0019] Four lower eyelet screws 4 are also provided on the base plate 3.

[0020] The pressure plate 15 is also equipped with 4 upper eyelet screws 23.

[0021] Rotate the movable handle and tighten the screw 27 to make the support block 5 slide radially along the slide groove, so that the inclined surface of the support block 5 supports the lower end surface of the bending and twisting support plate 2.

[0022] Rotating the upper clamping screw 30 causes the upper insert 34 to slide radially, allowing the first rubber pads 28 on both sides of the upper insert to support the upper ends of both sides of the bending and torsion support plate 2. Figure 9 The upper insert 34 has a stepped hole on one end face, and the upper clamping screw 30 also has a stepped structure with a thread on one end, which connects to the upper bracket 13. When the upper clamping screw 30 is rotated clockwise, it will cause the upper insert 34 to move inward radially, thereby supporting the two sides of the adjacent bending and twisting support plate 2 with the first rubber pads 28 on both sides of the upper insert 34. After the bending and twisting support plate 2 is milled, when the upper clamping screw 30 is rotated counterclockwise, the upper insert 34 will not move outward radially. At this time, it is necessary to grasp the second B-type handle 37 fixed on the surface of the upper insert 34 and apply an outward pulling force to move the upper insert 34 outward.

[0023] Rotating the lower clamping screw 7 causes the lower insert 33 to slide radially, allowing the second rubber pads 31 on both sides of the lower insert 33 to support the lower ends of both sides of the bending and twisting support plate 2. After the bending and twisting support plate 2 is milled, rotating the lower clamping screw 7 counterclockwise will not cause the lower insert 33 to move outward radially. At this time, it is necessary to grasp the first B-type handle 9 fixed on the surface of the lower insert 33 and apply an outward pulling force to move the lower insert 33 outward.

[0024] Before milling the bending and torsion support plate 2, arbitrarily select two adjacent bending and torsion support plates 2, and slide the upper insert 34 and the lower insert 33 respectively, so that the two support surfaces of the upper insert 34 are in contact with the upper ends of the side surfaces of the two bending and torsion support plates 2, and at the same time, the two support surfaces of the lower insert 33 are in contact with the lower ends of the side surfaces of the two bending and torsion support plates 2, and then fix the pressure plate 15. Then slide the remaining upper insert 34 and lower insert 33 in sequence, so that the two support surfaces of the upper insert 34 are in contact with the upper ends of the side surfaces of the remaining bending and torsion support plates 2.

[0025] A milling and clamping method for the end face of the bending and torsion support plate of a diffuser section assembly, employing... Figures 2-9 The milling fixture shown includes the following steps: (1) Loosen the locking nut 21, hoist the eye bolt 23, and remove the pressure plate 15; (2) Lift the lower lifting eye bolt 4, place the milling fixture on the milling machine worktable, align the positioning ring 11 positioning stop with the center of the worktable, and fix the milling fixture on the worktable. (3) Place the inner ring 1 of the parts to be processed (the inner ring 1 and the bending and twisting support plate 2 assembled as one piece) through the central column 22 and place the inner circular surface of the small diameter end of the axial direction on the positioning stop of the positioning ring 11. (4) The lifting eye bolt 23 is hoisted, the first bushing 17 on the pressure plate 15 passes through the fixed positioning pin 18 on the connecting plate 16, and the positioning stop on the pressure plate 15 positions the inner circle of the inner ring 1 with the large diameter end in the axial direction. (5) Rotate the upper clamping screw 30 and the lower clamping screw 7 corresponding to two adjacent bending and twisting support plates 2 so that the rubber pads (first rubber pad 28 and second rubber pad 31) on both sides of the upper insert 34 and the lower insert 33 just contact the side of the bending and twisting support plate 2, and rotate the locking nut 21 to fix the pressure plate 15 on the connecting plate 16. (6) Use a dial indicator to check the end face to be milled of the bending and twisting support plate 2. First, adjust the support structure of the upper insert 34 and the support structure of the lower insert 33 (radial sliding) respectively so that the rubber pads on both sides of the upper insert 34 and the lower insert 33 support the side of the bending and twisting support plate 2. Then adjust the tightening screw 27 of the movable handle so that the inclined surface on the support block 5 supports the lower end face of the bending and twisting support plate 2. Ensure that the difference in the value of the dial indicator before and after the support of the bending and twisting support plate 2 is not greater than 0.02mm. Repeat the above process to complete the support between all adjacent bending and twisting support plates 2. (7) After confirming that all upper inserts 34, lower inserts 33 and support blocks 5 support the bending and twisting support plate 2, the end face of the bending and twisting support plate 2 is milled. Select appropriate tools and cutting parameters to mill the end face of the bending and twisting support plate 2 to the required size (the upper inserts 34, lower inserts 33 and support blocks 5 are removed only after all the end faces of the bending and twisting support plate 2 have been processed to meet the requirements).

[0026] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A milling fixture for the end face of the bending and torsion support plate of a diffuser section assembly, characterized in that, include: The base plate (3) has multiple grooves, which are distributed on different radial lines of the same circumference. The number of grooves is the same as the number of bending and twisting support plates (2). Support block (5), the lower end of the support block (5) is slidably connected in the groove of the base plate (3), and the upper end of the support block (5) has an inclined surface for supporting the lower end face of the bending and twisting support plate (2). The lower support (6) is installed on the upper surface of the base plate (3), and a lower support (6) is set between any two adjacent sliding grooves. The upper end of the lower support (6) is slidably connected to a lower insert (33). The sliding direction of the lower insert (33) is along the radial line of another circle concentric with the circumference of the sliding groove. The two opposite side surfaces on the lower insert (33) respectively form a support surface for supporting the side surface of the bending and twisting support plate (2). Pressure plate (15), the pressure plate (15) is arranged parallel above the base plate (3), the pressure plate (15) and the base plate (3) are connected by a central column (22), and the lower end face of the pressure plate (15) is provided with a positioning stop for the large diameter end of the inner ring (1) in the axial direction; The upper bracket (13) is installed on the lower end face of the pressure plate (15). Multiple upper brackets (13) are distributed on different radial lines of the same circumference on the pressure plate (15), and the number of upper brackets (13) is the same as the number of lower brackets (6). The lower end of the upper bracket (13) is slidably connected to an upper insert (34). The sliding direction of the upper insert (34) is consistent with the radial line where the upper bracket (13) is located. The two opposite side surfaces on the upper insert (34) respectively form a support surface for supporting the side surface of the bending and twisting support plate (2). The positioning ring (11) is located on the upper end face of the base plate (3) and is located on the inner side of multiple support blocks (5) and multiple lower brackets (6). The upper end face of the positioning ring (11) is provided with a positioning stop for the small diameter end of the inner ring (1) in the axial direction.

2. The milling fixture for the end face of the bending and torsion support plate of the diffuser section assembly according to claim 1, characterized in that: The lower end of the support block (5) passes through the slide groove and connects with the cover plate (26) to form a sliding structure with an I-shaped cross section. The upper and lower ends of the I-shaped cross section are located above the upper end face and below the lower end face of the slide groove, respectively, and the middle of the I-shaped cross section is located inside the slide groove.

3. The milling fixture for the end face of the bending and torsion support plate of the diffuser section assembly according to claim 1, characterized in that: Each of the support blocks (5) has an active handle clamping screw (27) on its outer side that pushes the support block (5) to slide along the groove.

4. The milling fixture for the end face of the bending and torsion support plate of the diffuser section assembly according to claim 1, characterized in that, Also includes: A through groove that penetrates the upper and lower end faces of the lower insert (33); The protrusion is provided on the upper end face of the lower bracket (6), and the protrusion passes through the through groove of the lower insert (33) and is connected to the lower cover plate (8); The lower clamping screw (7) has one end passing through the lower insert (33) and then threaded to the protrusion, thereby driving the lower insert (33) to slide relative to the lower bracket (6); The second rubber pad (31) is respectively mounted on the surfaces of the two support surfaces on the lower insert (33).

5. A milling fixture for the end face of the bending and torsion support plate of a diffuser section assembly according to claim 1, characterized in that, Also includes: An I-shaped slide rail is located at the lower end of the upper bracket (13); A semi-enclosed groove is provided on the upper insert (34), and the upper insert (34) is inserted into the I-shaped slide rail through the opening of the semi-enclosed groove; The first rubber pad (28) is respectively mounted on the surfaces of the two support surfaces of the upper insert (34); The upper clamping screw (30) passes through the upper insert (34) and is threadedly connected to the upper bracket (13), thereby driving the upper insert (34) to slide relative to the upper bracket (13).

6. A milling fixture for the end face of the bending and torsion support plate of a diffuser section assembly according to claim 1, characterized in that: It also includes a base (25), which is an annular piece and is installed on the upper surface of the base plate (3) and is located inside multiple support blocks (5) and multiple lower brackets (6). A positioning ring (11) is installed on the upper end of the base (25). The lower end of the central column (22) passes through the base (25) and is connected to the base plate (3). The upper end of the central column (22) is connected to the pressure plate (15) via a connecting plate (16).

7. A milling fixture for the end face of the bending and torsion support plate of a diffuser section assembly according to claim 6, characterized in that: The upper end of the central column (22) is provided with a locking nut (21), and the pressure plate (15) is pressed between the locking nut (21) and the connecting plate (16).

8. A milling fixture for the end face of the bending and torsion support plate of a diffuser section assembly according to claim 1, characterized in that: It also includes an upper eye bolt (23) and a lower eye bolt (4), the upper eye bolt (23) being mounted on the pressure plate (15) and the lower eye bolt (4) being mounted on the base plate (3).

9. A milling and clamping method for the end face of a bending and torsion support plate of a diffuser section assembly, wherein multiple bending and torsion support plates (2) are assembled on the outer surface of an inner ring (1) to form a component, characterized in that, Milling clamping methods include: The inner ring (1) is clamped in such a way that the small diameter end of the inner ring (1) is facing down and the large diameter end of the inner ring (1) is facing up, and a clamping force is applied along the axis of the inner ring (1) at the small diameter end and the large diameter end of the inner ring (1) respectively. The clamping of the bending and twisting support plate (2) involves applying an upward supporting force to the lower end of each bending and twisting support plate (2) and applying a supporting force to the side surface of the bending and twisting support plate (2) between the side surfaces of every two adjacent bending and twisting support plates (2). One supporting force is close to the upper end of the side surface of the bending and twisting support plate (2), and the other supporting force is close to the lower end of the side surface of the bending and twisting support plate (2). All supporting forces corresponding to the upper end of the side surface of the bending and twisting support plate (2) are in the same plane, and all supporting forces corresponding to the lower end of the side surface of the bending and twisting support plate (2) are in another plane. The two planes are parallel to each other and perpendicular to the axis of the inner ring (1).

10. The milling clamping method according to claim 9, characterized in that: The milling fixture of claim 1 is used, and the process includes the following steps: Step 1: After removing the pressure plate (15), hoist the milling fixture onto the milling machine table, align the positioning stop of the positioning ring (11) with the center of the milling machine table, and then fix the milling fixture on the milling machine table. Step 2: Place the assembled inner ring (1) and bending and twisting support plate (2) into the milling fixture until the axial small diameter end of the inner ring (1) enters the positioning stop of the positioning ring (11); Step 3: Press the pressure plate (15) downwards onto the axial large diameter end of the inner ring (1) until the axial large diameter end of the inner ring (1) enters the positioning stop of the pressure plate (15). Step 4: Select any two adjacent bending and twisting support plates (2), and slide the upper insert (34) and the lower insert (33) respectively, so that the two support surfaces of the upper insert (34) are in contact with the upper end of the side surface of the two bending and twisting support plates (2) respectively, and at the same time, the two support surfaces of the lower insert (33) are in contact with the lower end of the side surface of the two bending and twisting support plates (2) respectively. Then fix the pressure plate (15). Step 5: Use a dial indicator to check the end face of the bending and twisting support plate (2) to obtain the initial reading. Then, continue to slide the upper insert (34) and the lower insert (33) so that the two support surfaces of the upper insert (34) and the two support surfaces of the lower insert (33) continue to apply support force to the side surface of the bending and twisting support plate (2). Then slide the support block (5) so that the inclined surface of the support block (5) supports the lower end face of the bending and twisting support plate (2) upward. Observe the change of the dial indicator reading and ensure that it is not greater than the set value. Then, take any one of the two bending and twisting support plates (2) as the starting position and select the other bending and twisting support plate (2) adjacent to it to repeat step 5 until the support of the remaining bending and twisting support plates (2) is completed. Step 6: After confirming that all the bending and twisting support plates (2) have completed their support, start milling the end faces of the bending and twisting support plates (2) until the end face milling of all the bending and twisting support plates (2) is completed.

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