Turbine back disc correction tool

Abstract

The utility model discloses a kind of turbine back disc correction frock, including main frame, bottom pedestal, upper correction mould, lower correction mould is equipped in main frame top, its surface is set up the blade avoidance slot of positioning turbine blade and the profiling surface of adapting turbine back disc inner side;Upper correction mould is located in turbine back disc outer side, and its lower surface is the profiling structure of adapting back disc outer side.Just inside bottom pedestal is bolted connection main frame, and it is equipped with vertical guide rail and turbine positioning guide pillar sliding fit, spring is arranged in guide rail for reset buffer, bottom pedestal is equipped with exhaust hole to eliminate guide pillar movement air resistance.Upper correction mould adopts split structure, hard alloy outer ring correction ring guarantees correction strength, and nylon center buffer block avoids damaging casting.This frock realizes the accurate constraint of back disc inner and outer contour, and there is no blade damage in correction process, and repair efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of component straightening technology, specifically to a turbine backplate straightening fixture. Background Technology

[0002] Turbines are generally manufactured using investment casting. Due to the turbine structure and gating system, significant thermal stress is generated during solidification and cooling, leading to stress concentration and deformation in the outermost circumference of the turbine backplate, resulting in a high turbine scrap rate. Traditional quality inspection processes typically scrap any turbines found to have defects, causing substantial waste. While turbines with minor backplate deformation can be repaired, the unique shape of the turbine and the risk of damage to the turbine blades during secondary machining necessitate a suitable straightening fixture that can repair and correct turbines with minor backplate deformation while avoiding damage to the turbine blades during the straightening process. Utility Model Content

[0003] The purpose of this invention is to overcome the defects in the existing technology and provide a turbine backplate straightening fixture.

[0004] To achieve the above objectives, the technical solution of this utility model is to design a turbine backplate straightening fixture, including a main frame, a bottom base, and an upper straightening mold. A lower straightening mold is provided above the main frame. The lower straightening mold has blade clearance grooves evenly opened on one side for placing turbine blades. The contact surface between the lower straightening mold and the turbine backplate is a contour-following structure adapted to the inner contour of the turbine backplate. The bottom base is bolted to the bottom of the main frame. A vertical guide rail is provided above the middle of the bottom base. The vertical guide rail slides in cooperation with a turbine positioning guide post on the side away from the turbine backplate. The upper straightening mold is located on the outside of the turbine backplate. The lower surface of the upper straightening mold is a contour-following structure adapted to the outer contour of the turbine backplate.

[0005] Furthermore, a spring is installed inside the vertical guide rail, with its two ends abutting against the top of the turbine positioning guide post and the inner bottom surface of the vertical guide rail, respectively. The spring can prevent the turbine positioning guide post from directly contacting the vertical guide rail when placing the turbine, thus preventing damage to the turbine blades. It can also ensure that the turbine is pushed out after the correction pressure is applied, reducing the damage to the turbine caused by manual removal.

[0006] Furthermore, an exhaust port is provided below the connection between the vertical guide rail and the bottom base, penetrating the bottom base. Since the turbine positioning guide post and the vertical guide rail need to slide together, to ensure accurate guidance, the gap between them needs to be minimized. When the turbine positioning guide post slides down the vertical guide rail, it will expel excess air from inside the vertical guide rail. The exhaust port allows this gas to escape smoothly.

[0007] Preferably, the upper straightening mold is a split structure, including an outer straightening ring and a central buffer block, which are connected by bolts. Since only the outermost circumference of the turbine backplate is straightened, a split structure is used to ensure that the central buffer block avoids damage from hard contact with the casting, while also ensuring that the outer ring maintains sufficient strength during straightening.

[0008] Preferably, the outer straightening ring is made of cemented carbide, and the central buffer block is made of nylon. The outer straightening ring is preferably made of cemented carbide, which ensures that it maintains its original shape and hardness even under repeated compression, improving straightening accuracy. The central buffer block is preferably made of nylon, which has advantages such as high mechanical strength, good toughness, and high tensile and compressive strength. Using nylon for the central buffer block avoids damage caused by hard contact with the casting.

[0009] Furthermore, the upper straightening mold has a positioning hole in its center that corresponds to the top positioning boss near the turbine backplate. The positioning hole and the top positioning boss work together to achieve precise positioning of the upper straightening mold.

[0010] The advantages and beneficial effects of this utility model are as follows: 1. The upper and lower straightening molds precisely match the inner and outer contours of the turbine backplate, avoiding local stress concentration and correcting slight deformation of the turbine backplate during pressure application; 2. The blade clearance groove can prevent the tooling from damaging the turbine blades during the straightening process; 3. Spring-driven guide column lifting fixture solves the problems of low efficiency and easy damage to workpieces caused by manually removing the workpiece after the hydraulic press is depressurized; Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the straightening tool of this utility model; Figure 2 This is a cross-sectional view of the straightening fixture of this utility model; Figure 3 This is an exploded view of the straightening tool of this utility model.

[0012] Figure 4 This is a schematic diagram of the main frame of the straightening fixture of this utility model.

[0013] In the diagram: 1. Main frame; 2. Bottom base; 3. Upper straightening mold; 31. Outer straightening ring; 32. Central buffer block; 33. Positioning hole; 4. Lower straightening mold; 41. Blade clearance groove; 51. Turbine blade; 52. Turbine back plate; 53. Turbine positioning guide post; 54. Top positioning boss; 6. Bolt; 7. Vertical guide rail; 71. Exhaust port; 8. Spring. Detailed Implementation

[0014] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0015] according to Figures 1-3 As shown, this utility model is a turbine backplate straightening fixture, including a main frame 1, a bottom base 2, and an upper straightening mold 3. A lower straightening mold 4 is provided above the main frame 1. The lower straightening mold 4 has blade clearance grooves 41 evenly opened on one side for placing turbine blades 51. The contact surface between the lower straightening mold 4 and the turbine backplate 52 is a contour-following structure adapted to the inner contour of the turbine backplate 52. The bottom base 2 is installed below the main frame 1 using bolts 6. A vertical guide rail 7 is provided above the middle of the bottom base 2. The vertical guide rail 7 is slidably engaged with a turbine positioning guide post 53 on the side away from the turbine backplate 52. The upper straightening mold 3 is located outside the turbine backplate 52. The lower surface of the upper straightening mold 3 is a contour-following structure adapted to the outer contour of the turbine backplate 52.

[0016] The upper straightening mold 3 is provided with a positioning hole 33 in the middle, which is adapted to the top positioning boss 54 on the side near the turbine back plate 52.

[0017] The specific workflow is as follows: When in use, remove the upper straightening mold 3, then place the turbine positioning guide post 53 of the turbine to be straightened into the vertical guide rail 7. The turbine positioning guide post 53 slides slowly downward along the vertical guide rail 7 until the turbine back plate 52 of the turbine fits against the lower straightening mold 4. Then, place the upper straightening mold 3 above the turbine back plate 52, and make the positioning hole 33 match the top positioning boss 54. Then, place the fixture on the hydraulic press worktable, and the hydraulic press applies pressure to the upper straightening mold 3 so that the pressure acting on the turbine back plate 52 reaches about 0.5~1MPa (the pressure here is selected according to the specific size and material of the turbine, etc., and should not be too high to prevent the turbine back plate or blades from breaking). Then, remove the upper straightening mold 3 and take out the turbine.

[0018] according to Figure 2As shown, in any embodiment, a spring 8 is provided inside the vertical guide rail 7, with both ends of the spring 8 abutting against the top of the turbine positioning guide post 53 and the inner bottom surface of the vertical guide rail 7, respectively. The difference between this embodiment and other embodiments is that, in use, the upper straightening mold 3 is removed, and then the turbine positioning guide post 53 of the turbine to be straightened is placed into the vertical guide rail 7. Under the action of the spring 8, there is still some gap between the turbine back plate 52 of the turbine and the lower straightening mold 4. At this time, there is also some gap between the contact point between the turbine positioning guide post 53 and the turbine blade 51 and the top of the vertical guide rail 7, thereby avoiding direct contact between the turbine blade 51 and the top of the vertical guide rail 7, which could cause damage. Next, the upper straightening mold 3 is placed in. Under the influence of the pressure of the upper straightening mold 3, the spring 8 is compressed downwards until the turbine back plate 52 of the turbine and the lower straightening mold 4 are in contact. After pressure is applied and correction is completed, the upper correction mold 3 is removed. Under the action of spring 8, the turbine is lifted, and the turbine back plate 52 separates from the lower correction mold 4. The operator can directly remove the turbine, avoiding the need to use other tools to pry it out, which would cause secondary damage and be inefficient.

[0019] according to Figure 2 As shown, in any embodiment, an exhaust hole 71 is provided below the connection between the vertical guide rail 7 and the bottom base 2, penetrating the bottom base 2. The difference between this embodiment and other embodiments is that, because the turbine positioning guide post 53 and the vertical guide rail 7 need to slide together, to ensure accurate guidance, the gap between them needs to be minimized. When the turbine positioning guide post 53 slides down the vertical guide rail 7, it will expel excess air from inside the vertical guide rail 7. Providing an exhaust hole 71 allows this gas to be expelled smoothly.

[0020] according to Figure 3 As shown, in any embodiment, the upper straightening mold 3 is a split structure, including an outer straightening ring 31 and a central buffer block 32, which are connected by bolts 6. The outer straightening ring 31 is made of cemented carbide, and the central buffer block 32 is made of nylon. The difference between this embodiment and other embodiments is that, since only the outermost circumference of the turbine backplate 52 is straightened, a split structure is used. This ensures that the central buffer block 32 avoids damage caused by hard contact with the casting, while also ensuring that the outer ring maintains sufficient strength during straightening. The outer straightening ring 31 is preferably made of cemented carbide, which ensures that it can maintain its original shape and hardness even under repeated compression, improving straightening accuracy. The central buffer block 32 is preferably made of nylon, which, with its good mechanical properties and toughness, further avoids damage caused by hard contact with the casting.

[0021] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A turbine backplate straightening fixture, characterized in that, The system includes a main frame (1), a bottom base (2), and an upper straightening mold (3). A lower straightening mold (4) is provided above the main frame (1). The lower straightening mold (4) has blade clearance grooves (41) evenly opened on one side for placing turbine blades (51). The contact surface between the lower straightening mold (4) and the turbine back plate (52) is a contoured structure that adapts to the inner contour of the turbine back plate (52). The bottom base (2) is installed below the main frame (1) using bolts (6). A vertical guide rail (7) is provided above the middle of the bottom base (2). The vertical guide rail (7) is slidably engaged with a turbine positioning guide post (53) on the side away from the turbine back plate (52). The upper straightening mold (3) is located outside the turbine back plate (52). The lower surface of the upper straightening mold (3) is a contoured structure that adapts to the outer contour of the turbine back plate (52).

2. The turbine backplate straightening fixture according to claim 1, characterized in that, The vertical guide rail (7) is equipped with a spring (8), and the two ends of the spring (8) abut against the top of the turbine positioning guide post (53) and the inner bottom surface of the vertical guide rail (7), respectively.

3. The turbine backplate straightening fixture according to claim 1, characterized in that, An exhaust hole (71) is provided below the connection between the vertical guide rail (7) and the bottom base (2) through the bottom base (2).

4. The turbine backplate straightening fixture according to claim 1, characterized in that, The upper correction mold (3) is a split structure, including an outer correction ring (31) and a central buffer block (32), which are connected by bolts (6).

5. A turbine backplate straightening fixture according to claim 4, characterized in that, The outer ring correction ring (31) is made of hard alloy, and the central buffer block (32) is made of nylon.

6. The turbine backplate straightening fixture according to claim 4, characterized in that, The upper straightening mold (3) is provided with a positioning hole (33) in the middle that is adapted to the top positioning boss (54) on the side near the turbine back plate (52).

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