Tool and method for correcting roundness of two casings with different diameters
By designing tooling adapted to different diameters and implementing annealing treatment, the problem of non-compliant outer roundness of titanium alloy intermediate casing castings was solved, resulting in cost reduction and increased production efficiency, while ensuring the stability and precision of the castings.
Patent Information
- Application Number
- CN202511200524.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-26
- Publication Date
- 2025-11-14
AI Technical Summary
In the existing technology, the outer roundness of the titanium alloy intermediate casing casting is not up to standard, resulting in high production costs and low efficiency. Traditional tooling needs to be designed separately for each diameter specification, which cannot be adapted to casing castings of different diameters.
Design a tooling that includes a base plate, a ring plate, a ring body, and a movable inclined block. Through the selectively installable movable inclined block and movable limiting block, it can be adapted to two different diameter casing castings of φ1078mm and φ1050mm. Combined with mechanical external force correction and annealing treatment, the roundness correction of the casting is achieved.
It reduces tooling design and processing costs, improves production efficiency, avoids damage from over-correction, and ensures the long-term stability and dimensional accuracy of castings.
Smart Images
Figure CN120940441A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aerospace titanium alloy casing manufacturing technology, and in particular to a tooling and method for correcting the roundness of two casings with different diameters. Background Technology
[0002] Titanium alloy intermediate casing castings are one of the core components of aero engines, with huge market demand. Furthermore, with the rapid development of the aviation industry, their performance requirements and structural complexity are constantly increasing. Because casing castings are mostly large, thin-walled structures, the casting process is extremely difficult. During the casting and cooling process, the overall shrinkage of the casting is large and uneven, easily leading to significant deformation of the outer diameter, manifesting as out-of-tolerance outer roundness and the formation of elliptical or other irregular shapes. Statistics show that after the metallurgical quality is qualified, more than 60% of titanium alloy intermediate casing castings cannot directly enter the subsequent assembly process due to uncontrolled outer roundness and require correction treatment.
[0003] Currently, the methods for correcting the outer roundness of casing castings mainly rely on traditional dedicated tooling, that is, designing and manufacturing separate correction tooling for casings of a specific diameter. For example, a titanium alloy intermediate casing casting needs to have the roundness of its upper mounting edge corrected. This titanium alloy intermediate casing casting has two diameter specifications: ① the inner diameter of the upper mounting edge is φ1078mm, ② the inner diameter of the upper mounting edge is φ1050mm. The two specifications of casing have similar structures, and the traditional method for correcting the upper mounting edge is to manufacture two separate sets of tooling. Therefore, each diameter of casing requires separate design and machining of tooling, increasing production costs. Summary of the Invention
[0004] The main objective of this invention is to provide a tooling and method for correcting the roundness of two different diameter casings, in order to solve the aforementioned technical problems.
[0005] To achieve the above objectives, in a first aspect, the present invention proposes a tooling for correcting the roundness of two different diameter casings, comprising a base plate, an annular plate, an annular body, and a movable inclined block; the annular plate is spaced apart directly above the base plate, and multiple support columns are provided between the base plate and the annular plate; multiple U-shaped grooves are formed on the top surface of the annular plate; a movable expansion block is slidably installed in the U-shaped grooves; the outer circumferential surface of the annular body is an inverted conical surface, and a slot is formed on the outer circumferential surface of the annular body; the vertical surface of the slot is set as a driving surface, which is also an inverted conical surface; the movable inclined block can be selectively installed in the slot to adapt to casings of different diameters to be corrected; the outer surface of the movable inclined block is an inverted conical surface; the end of the movable expansion block facing the center of the annular plate is the inner end, and the end away from the center of the annular plate is the outer end; the end face of the inner end of the movable expansion block is set as an inverted conical surface for contacting and engaging with the driving surface of the slot, or for contacting and engaging with the outer surface of the movable inclined block.
[0006] Preferably, a cover plate is fastened to the opening of the U-shaped groove; the cover plate is fastened to the annular plate by screws.
[0007] Preferably, there is a gap of 0.2-0.3 mm between the lower surface of the cover plate and the upper surface of the movable expansion block; there is a gap of 0.2-0.3 mm between the two side walls of the U-shaped slide and the two side surfaces of the movable expansion block.
[0008] Preferably, three lifting eye bolts are evenly spaced in a ring on the top surface of the annulus.
[0009] Preferably, the base plate is an annular plate with a weight-reducing hole at its center.
[0010] Preferably, there are 8 U-shaped grooves, which are distributed in a ring at intervals on the circular plate, and a movable expansion block is provided in each U-shaped groove.
[0011] Preferably, the movable inclined block and the slot are interference fit, and two threaded holes are provided on the top surface of the movable inclined block.
[0012] Preferably, a limiting groove is started at the bottom of the U-shaped groove; the end of the limiting groove facing the center of the annular plate is open, and the end away from the center of the annular plate is closed and forms a limiting block; a fixed limiting block and a movable limiting block are provided on the bottom surface of the movable expansion block; the fixed limiting block is integrally formed on the bottom surface of the movable expansion block; a rectangular insertion hole is provided on the bottom surface of the movable expansion block, and the movable limiting block is movably inserted into the rectangular insertion hole; both the fixed limiting block and the movable limiting block slide in cooperation with the limiting groove; the movable limiting block is located at the center of the bottom surface of the movable expansion block; the fixed limiting block is located on the bottom surface of the movable expansion block and near the inner end.
[0013] Secondly, the present invention proposes a method for correcting the roundness of a φ1078mm casing using the aforementioned tooling, comprising the following steps: S1. Assembly fixture: Insert the movable inclined block into the slot of the annular body; remove the movable limiting block from the movable expansion block; install the movable expansion block with the fixed limiting block in the U-shaped slide groove of the annular plate, and install the cover plate; S2. Place the casing casting with a specification of φ1078mm to be corrected on the base plate and adjust the position of the casing casting so that the axis of the casing casting is collinear with the axis of the annular plate. S3. Adjust the radial position of the movable expansion block so that the outer end face of the movable expansion block initially abuts against the inner wall surface of the upper mounting edge of the casing casting. S4. After hoisting the ring body equipped with the movable inclined block to the top of the ring plate, slowly lower it so that the outer side of the movable inclined block contacts the end face of the inner end of the movable expansion block. S5. Using a press to act on the top surface of the ring, the ring moves downward. At this time, the movable expansion block moves outward along the radial direction. When the fixed limit block abuts against the limit stop block, the movable expansion block can no longer move. S6. Remove the external force from the press and anneal the casing casting with tooling to release stress; S7. After the casing casting has cooled, remove the casing casting from the tooling to complete the straightening of the casing casting with a specification of φ1078mm.
[0014] Thirdly, this invention proposes a method for correcting the roundness of a φ1050mm casing using the aforementioned tooling, comprising the following steps: T1. Assembly fixture: Pull the movable inclined block out of the slot of the ring body; insert the movable limiting block into the rectangular insertion hole on the bottom surface of the movable expansion block; install the movable expansion block with fixed limiting block and movable limiting block in the U-shaped slide groove of the ring plate, and install the cover plate. T2. Place the φ1050mm casing casting to be corrected on the base plate and adjust its position so that the axis of the casing casting is collinear with the axis of the annular plate. T3. Adjust the radial position of the movable expansion block so that the outer end face of the movable expansion block initially abuts against the inner wall surface of the upper mounting edge of the casing casting. T4. After removing the movable inclined block, hoist the annular body to the top of the annular plate and slowly lower it so that the driving surface of the slot contacts the end face of the inner end of the movable expansion block. T5. Using a press to act on the top surface of the ring, the ring moves downward. At this time, the movable expansion block moves outward along the radial direction. When the movable limit block abuts against the limit stop block, the movable expansion block can no longer move. T6. Remove the external force from the press and anneal the casing casting with tooling to release stress; T7. After the casing casting has cooled, remove the casing casting from the tooling to complete the straightening of the casing casting with a specification of φ1050mm.
[0015] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: (1) High versatility and reduced manufacturing cost: By designing movable inclined blocks and movable limiting blocks that can be selectively installed, the same tooling can be adapted to two different diameter casing castings of φ1078mm and φ1050mm. There is no need to make tooling separately for each diameter casing casting, which reduces the cost of tooling design, processing and maintenance.
[0016] (2) Easy to operate and improve production efficiency: The tooling structure is reasonably designed and the steps of the correction process are clear. Operators only need to selectively install movable inclined blocks and movable limit blocks to complete the correction switching of different diameter casings, which significantly improves production efficiency.
[0017] (3) In this application, by setting the limiting slide groove to be open at one end and closed at the other end, and forming a limiting block at the closed end, the limiting block and the fixed limiting block or the movable limiting block form a limiting effect, thereby limiting the radial movement distance of the movable expansion block, so as to adapt to the two different diameters of the casing casting, φ1078mm and φ1050mm, and avoid over-correction causing damage to the casing casting.
[0018] (4) Sufficient stress release and good stability: The annealing process after straightening can fully release the internal stress generated in the casting and straightening process, avoid deformation and springback of the casting in subsequent processing or use, and improve the long-term stability of the casing size. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0020] Figure 1 A three-dimensional structural schematic diagram of the tooling provided by the present invention; Figure 2 A cross-sectional view of the tooling provided by the present invention; Figure 3 This is a schematic diagram of the slots formed on the annulus in this invention; Figure 4 This is a schematic diagram of the movable inclined block in this invention; Figure 5 This is a schematic diagram showing the cooperation between the movable expansion block and the fixed limiting block and the movable limiting block in this invention; Figure 6 This is a schematic diagram of the U-shaped groove formed on the annular plate in this invention; Figure 7 This is a schematic diagram of the tooling provided by the present invention used to correct the roundness of a φ1078mm casing; Figure 8 This is a schematic diagram showing the movable inclined block installed on the annulus, with the outer side of the movable inclined block in contact with the end face of the inner side of the movable expansion block. Figure 9 This is a schematic diagram showing the drive surface of the slot contacting the end face of the inner end of the movable expansion block after the movable wedge is removed. Reference numerals: 1. Base plate; 1a. Weight reduction hole; 2. Circular ring plate; 2a. U-shaped slide groove; 2b. Limiting slide groove; 2c. Limiting stop block; 3. Support column; 4. Movable expansion block; 4a. Inner end; 4b. Outer end; 5. Circular ring body; 5a. Slot; 5b. Drive surface; 6. Movable inclined block; 6a. Threaded hole; 7. Limiting block; 8. Cover plate; 9. Lifting eye bolt; 10. Fixed limiting block; 11. Movable limiting block; 12. Casing casting; 12a. Upper mounting edge. Detailed Implementation
[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this invention are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly. In addition, in this invention, the inner end refers to the end facing the central axis of the clamp, and the outer end refers to the end away from the central axis of the clamp; similarly, the inner side refers to the side facing the central axis of the clamp, and the outer side refers to the side away from the central axis of the clamp.
[0023] Combination Figures 1 to 6 As shown, a tooling for correcting the roundness of two different diameter casings includes a base plate 1, an annular plate 2, an annular body 5, and a movable inclined block 6. The annular plates 2 are spaced apart directly above the base plate 1, and multiple support columns 3 are arranged between the base plate 1 and the annular plates 2. Specifically, the top surface of the base plate 1 has positioning holes (not shown in the figure) for mounting the support columns 3, and one lower end of the support column 3 is inserted into the positioning hole. The top end of the support column 3 is welded to the bottom surface of the annular plate 2. Multiple U-shaped grooves 2a are provided on the top surface of the annular plate 2; movable expansion blocks 4 are slidably installed in the U-shaped grooves 2a; the outer circumferential surface of the annular body 5 is an inverted conical surface, and a slot 5a is provided on the outer circumferential surface of the annular body 5; the vertical surface of the slot 5a is set as a driving surface 5b, which is an inverted conical surface, and the axis of the driving surface 5b is collinear with the central axis of the annular body 5; and the driving surface 5b is parallel to the outer circumferential surface of the annular body 5.
[0024] The movable inclined block 6 can be selectively installed in the slot 5a to accommodate different diameter housings to be calibrated; the outer surface 6c of the movable inclined block 6 is an inverted conical surface.
[0025] The end of the movable expansion block 4 facing the center of the annular plate 2 is the inner end 4a, and the end away from the center of the annular plate 2 is the outer end 4b.
[0026] Combination Figure 8 and Figure 9 As shown, the inner end 4a of the movable expansion block 4 is configured as an inverted conical surface, which is used to contact and cooperate with the driving surface 5b of the slot 5a, or to contact and cooperate with the outer surface of the movable inclined block 6.
[0027] Furthermore, a cover plate 8 is fastened to the opening of the U-shaped slide groove 2a; the cover plate 8 is fastened to the annular plate 2 by screws. There is a 0.2-0.3mm gap between the lower surface of the cover plate 8 and the upper surface of the movable expansion block 4; there is also a 0.2-0.3mm gap between the two side walls of the U-shaped slide groove 2a and the two side surfaces of the movable expansion block 4. This structure facilitates the sliding of the movable expansion block 4 within the U-shaped slide groove 2a.
[0028] To facilitate the lifting of the ring body 5, three lifting eye bolts 9 are evenly spaced in a ring on the top surface of the ring body 5.
[0029] To reduce the weight of the base plate 1, the base plate 1 is configured as a circular plate, and a weight-reducing hole 1a is provided in the center of the base plate 1.
[0030] In this embodiment, there are 8 U-shaped grooves 2a, which are distributed in a ring at intervals on the annular plate 2, and a movable expansion block 4 is provided in each U-shaped groove 2a.
[0031] Combination Figure 4 and Figure 8 As shown, the movable inclined block 6 and the slot 5a are interference-fitted, and two threaded holes 6a are provided on the top surface of the movable inclined block 6. When the movable inclined block 6 and the annular body 5 descend, the outer surface of the movable inclined block 6 contacts the end face of the inner end 4a of the movable expansion block 4, pushing the movable expansion block 4 to move radially outward. At this time, the movable inclined block 6 will be subjected to an upward frictional force, which causes the movable inclined block 6 to tend to slide out of the slot 5a. Therefore, the interference fit can prevent the movable inclined block 6 from sliding out. When it is necessary to remove the movable inclined block 6 from the slot 5a of the annular body 5, two screws can be screwed into the two threaded holes 6a, and the screws can be clamped with pliers or other tools to apply a certain force to pull out the movable inclined block 6.
[0032] Combining 2, Figure 5 and Figure 6 As shown, a limiting groove 2b begins at the bottom of the U-shaped groove 2a; the end of the limiting groove 2b facing the center of the annular plate 2 is open, and the end away from the center of the annular plate 2 is closed, forming a limiting block 2c; a fixed limiting block 10 and a movable limiting block 11 are provided on the bottom surface of the movable expansion block 4; the fixed limiting block 10 is integrally formed on the bottom surface of the movable expansion block 4; a rectangular insertion hole (not shown in the figure) is provided on the bottom surface of the movable expansion block 4, and the movable limiting block 11 is movably inserted into the rectangular insertion hole; both the fixed limiting block 10 and the movable limiting block 11 slide in cooperation with the limiting groove 2b; the movable limiting block 11 is located at the center of the bottom surface of the movable expansion block 4; the fixed limiting block 10 is located on the bottom surface of the movable expansion block 4 and near the inner end 4a.
[0033] In this embodiment, the base plate 1 serves as the basic support component of the entire tooling, used to support the casing casting 12 to be corrected and other tooling components. Its top surface is set as a reference plane to ensure that the casting is placed stably.
[0034] There are 8 support columns 3. The lower end is inserted into the positioning hole of the base plate 1, and the upper end supports the ring plate 2. This is used to ensure the parallelism and distance between the ring plate 2 and the base plate 1, and to provide a stable spatial structure for casting straightening.
[0035] There are 8 movable expansion blocks 4, which are slidably installed in the U-shaped groove 2a of the annular plate 2. The end face of the outer end 4a is provided with an arc-shaped contact surface. The curvature of the arc-shaped contact surface is adapted to the standard curvature of the inner wall surface of the upper mounting edge 12a of the casing casting 12, and is used to fit on the inner wall surface of the upper mounting edge 12a to transmit the corrective force during the correction process.
[0036] The annular body 5 is used to receive the external force of the press and transmit the force directly to the movable expansion block 4, or to the movable expansion block 4 via the movable inclined block 6.
[0037] Combination Figure 7 catch Figure 8 As shown, a method for correcting the roundness of a φ1078mm casing using the above-mentioned tooling includes the following steps: S1. Assembly fixture: Insert the movable inclined block 6 into the slot 5a of the annular body 5; remove the movable limiting block 11 from the movable expansion block 4; install the movable expansion block 4 with the fixed limiting block 10 in the U-shaped slide groove 2a of the annular plate 2, and install the cover plate 8. S2. Place the casing casting 12 with a specification of φ1078mm to be corrected on the base plate 1 and adjust the position of the casing casting 12 so that the axis of the casing casting 12 is collinear with the axis of the annular plate 2. S3. Adjust the radial position of the movable expansion block 4 so that the end face of the outer end 4b of the movable expansion block 4 initially abuts against the inner wall surface of the upper mounting edge 12a of the casing casting 12. S4. After hoisting the ring body 5 equipped with the movable inclined block 6 to the top of the ring plate 2, it is slowly lowered so that the outer side of the movable inclined block 6 contacts the end face of the inner end 4a of the movable expansion block 4. S5. Using a press to act on the top surface of the ring 5, the ring 5 is pushed downward. At this time, the movable expansion block 4 moves outward along the radial direction. When the fixed limit block 10 abuts against the limit block 2c, the movable expansion block 4 can no longer move. S6. Remove the external force from the press and anneal the casing casting 12 with tooling to release stress. S7. After the casing casting 12 has cooled, remove the casing casting 12 from the tooling to complete the straightening of the casing casting 12 with a specification of φ1078mm.
[0038] Combination Figure 7 catch Figure 9As shown, a method for correcting the roundness of a φ1050mm casing using the tooling described in claim 8 includes the following steps: T1. Assembly fixture: Pull the movable inclined block 6 out of the slot 5a of the annular body 5; insert the movable limiting block 11 into the rectangular insertion hole on the bottom surface of the movable expansion block 4; install the movable expansion block 4 with the fixed limiting block 10 and the movable limiting block 11 in the U-shaped slide groove 2a of the annular plate 2, and install the cover plate 8. T2. Place the casing casting 12 with a specification of φ1050mm to be corrected on the base plate 1 and adjust the position of the casing casting 12 so that the axis of the casing casting 12 is collinear with the axis of the annular plate 2. T3. Adjust the radial position of the movable expansion block 4 so that the end face of the outer end 4b of the movable expansion block 4 initially abuts against the inner wall surface of the upper mounting edge 12a of the casing casting 12. T4. After removing the movable inclined block 6, the annular body 5 is hoisted to the top of the annular plate 2 and then slowly lowered so that the driving surface 5b of the slot 5a contacts the end face of the inner end 4a of the movable expansion block 4. T5. Using a press to act on the top surface of the ring 5, the ring 5 is pushed downward. At this time, the movable expansion block 4 moves outward along the radial direction. When the movable limit block 11 abuts against the limit stop block 2c, the movable expansion block 4 can no longer move. T6. Remove the external force from the press and anneal the casing casting 12 with tooling to release stress. T7. After the casing casting 12 has cooled, remove the casing casting 12 from the tooling to complete the straightening of the casing casting 12 with a specification of φ1050mm.
[0039] In summary, the tooling and method provided by this invention are based on a combination of mechanical external force correction and stress annealing stabilization: the casing casting 12 to be corrected is placed on the top surface of the base plate 1, and the outer end 4a of the movable expansion block 4 is attached to the inner wall of the upper mounting edge 12a of the casing casting 12. A press is applied to the annular body 5, which receives the external force from the press and transmits it directly to the movable expansion block 4, or to the movable expansion block 4 via the movable inclined block 6. The movable expansion block 4 radially presses the upper mounting edge 12a until its roundness is restored to the standard state. Subsequently, the casting with the tooling is annealed to release the internal stress generated during the correction process, preventing deformation and springback after cooling, ultimately achieving stable correction of the roundness of the upper mounting edge 12a.
[0040] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.
Claims
1. A tooling for correcting the roundness of two different diameter casings, characterized in that, It includes a base plate (1), a ring plate (2), a ring body (5), and a movable inclined block (6); The annular plate (2) is spaced apart and positioned directly above the base plate (1), and multiple support columns (3) are provided between the base plate (1) and the annular plate (2). Multiple U-shaped grooves (2a) are provided on the top surface of the annular plate (2); movable expansion blocks (4) are slidably installed in the U-shaped grooves (2a); The outer circumferential surface of the annulus (5) is an inverted conical surface, and a slot (5a) is provided on the outer circumferential surface of the annulus (5); the vertical surface of the slot (5a) is set as a driving surface (5b), which is an inverted conical surface; The movable inclined block (6) can be selectively installed in the slot (5a) to adapt to the casing to be calibrated of different diameters; the outer surface of the movable inclined block (6) is an inverted conical surface; The end of the movable expansion block (4) facing the center of the annular plate (2) is the inner end (4a), and the end away from the center of the annular plate (2) is the outer end (4b). The end face of the inner end (4a) of the movable expansion block (4) is set as an inverted conical surface, which is used to contact and cooperate with the driving surface (5b) of the slot (5a), or to contact and cooperate with the outer surface of the movable inclined block (6).
2. The tooling according to claim 1, characterized in that, A cover plate (8) is fastened to the opening of the U-shaped groove (2a); the cover plate (8) is fastened to the annular plate (2) by screws.
3. The tooling according to claim 2, characterized in that, There is a gap of 0.2-0.3 mm between the lower surface of the cover plate (8) and the upper surface of the movable expansion block (4); there is a gap of 0.2-0.3 mm between the two side walls of the U-shaped groove (2a) and the two sides of the movable expansion block (4).
4. The tooling according to claim 1, characterized in that, Three eye bolts (9) are evenly spaced in a ring on the top surface of the annulus (5).
5. The tooling according to claim 1, characterized in that, The base plate (1) is a circular plate, and a weight reduction hole (1a) is provided in the center of the base plate (1).
6. The tooling according to claim 1, characterized in that, There are 8 U-shaped grooves (2a) distributed in a ring on the annular plate (2), and a movable expansion block (4) is provided in each U-shaped groove (2a).
7. The tooling according to claim 1, characterized in that, The movable inclined block (6) and the slot (5a) are interference fit, and two threaded holes (6a) are provided on the top surface of the movable inclined block (6).
8. The tooling according to claim 2, characterized in that, A limiting groove (2b) is started at the bottom of the U-shaped groove (2a); the end of the limiting groove (2b) facing the center of the annular plate (2) is open, and the end away from the center of the annular plate (2) is closed and forms a limiting block (2c). A fixed limiting block (10) and a movable limiting block (11) are provided on the bottom surface of the movable expansion block (4); the fixed limiting block (10) is integrally formed on the bottom surface of the movable expansion block (4); A rectangular insertion hole is provided on the bottom surface of the movable expansion block (4), and the movable limiting block (11) is movably inserted into the rectangular insertion hole; The fixed limiting block (10) and the movable limiting block (11) are both slidably engaged with the limiting groove (2b); the movable limiting block (11) is located at the center of the bottom surface of the movable expansion block (4); the fixed limiting block (10) is located on the bottom surface of the movable expansion block (4) and near the inner end (4a).
9. A method for correcting the roundness of a φ1078mm casing using the tooling described in claim 8, characterized in that, Includes the following steps: S1. Assembly fixture: Insert the movable inclined block (6) into the slot (5a) of the annular body (5); remove the movable limiting block (11) from the movable expansion block (4); install the movable expansion block (4) with the fixed limiting block (10) in the U-shaped groove (2a) of the annular plate (2) and install the cover plate (8). S2. Place the casing casting (12) with a specification of φ1078mm to be corrected on the base plate (1) and adjust the position of the casing casting (12) so that the axis of the casing casting (12) is collinear with the axis of the annular plate (2). S3. Adjust the radial position of the movable expansion block (4) so that the end face of the outer end (4b) of the movable expansion block (4) initially abuts against the inner wall surface of the upper mounting edge (12a) of the casing casting (12); S4. After hoisting the ring body (5) equipped with the movable inclined block (6) to the top of the ring plate (2) and slowly lowering it, the outer side of the movable inclined block (6) contacts the end face of the inner end (4a) of the movable expansion block (4). S5. Using a press to act on the top surface of the ring (5), the ring (5) is pushed downward. At this time, the movable expansion block (4) moves outward along the radial direction. When the fixed limit block (10) abuts against the limit stop block (2c), the movable expansion block (4) cannot continue to move. S6. Remove the external force of the press and anneal the casing casting (12) with tooling to release the stress; S7. After the casing casting (12) has cooled down, remove the casing casting (12) from the tooling to complete the straightening of the casing casting (12) with a specification of φ1078mm.
10. A method for correcting the roundness of a φ1050mm casing using the tooling described in claim 8, characterized in that, Includes the following steps: T1. Assembly tooling: Pull the movable inclined block (6) out of the slot (5a) of the annular body (5); insert the movable limiting block (11) into the rectangular insertion hole on the bottom surface of the movable expansion block (4); install the movable expansion block (4) with the fixed limiting block (10) and the movable limiting block (11) in the U-shaped slide groove (2a) of the annular plate (2), and install the cover plate (8). T2. Place the casing casting (12) with a specification of φ1050mm to be corrected on the base plate (1) and adjust the position of the casing casting (12) so that the axis of the casing casting (12) is collinear with the axis of the annular plate (2). T3. Adjust the radial position of the movable expansion block (4) so that the end face of the outer end (4b) of the movable expansion block (4) initially abuts against the inner wall surface of the upper mounting edge (12a) of the casing casting (12); T4. After removing the movable inclined block (6), the ring body (5) is hoisted to the top of the ring plate (2) and then slowly lowered so that the driving surface (5b) of the slot (5a) contacts the end face of the inner end (4a) of the movable expansion block (4). T5. Using a press to act on the top surface of the ring (5), the ring (5) is pushed downward. At this time, the movable expansion block (4) moves outward along the radial direction. When the movable limit block (11) abuts against the limit stop block (2c), the movable expansion block (4) cannot continue to move. T6. Remove the external force from the press and anneal the casing casting (12) with tooling to release stress; T7. After the casing casting (12) has cooled down, remove the casing casting (12) from the tooling to complete the straightening of the casing casting (12) with a specification of φ1050mm.