A method and apparatus for forming large size high temperature alloy curved single wall segment products

Abstract

The application discloses a forming method of a large-size high-temperature alloy curved generatrix single-wall section product, which comprises the following steps: preparing a fan-shaped spread material; rolling and bending the fan-shaped spread material to form a conical cylinder by forming and combining welding; performing flanging forming on the conical cylinder, and the flanging angle is 30-35 degrees; performing bulging forming on the product obtained by the flanging forming; and performing solid solution treatment on the product obtained by the bulging forming, and the shape correction is realized by adopting the method of re-bulging forming, so that the springback is reduced. The application further discloses a forming device of a large-size curved generatrix single-wall section product, which comprises a flanging die, a female die and a bulging die; wherein the flanging die and the female die are used for realizing flanging forming; and the bulging die and the female die are used for realizing bulging forming. The product obtained by the application has high shape and size precision, low forming period and manufacturing cost, and small springback of the high-temperature alloy product after forming, and is suitable for batch production of large-size high-temperature alloy single-wall section products.

Description

Technical Field

[0001] This invention belongs to the fields of plastic processing technology and aerospace manufacturing technology, and specifically relates to a method and apparatus for forming large-size high-temperature alloy curved single-wall section products. It can be extended to high-precision forming of engine single-wall nozzles and inner and outer wall nozzle products made of high-temperature alloys, stainless steel and other materials. Background Technology

[0002] The single-wall section is a crucial component in the cooling cycle of a rocket engine, and with increasing payload capacity, its reliability requirements are becoming increasingly stringent. The structure of the single-wall section of a certain manned rocket engine is shown below. Figure 1 As shown, the difficulty mainly lies in the following aspects:

[0003] (1) The product outline dimensions are in the 1.5m range, composed of complex curved generatrices, and the material is a high-temperature alloy with high springback and poor plasticity;

[0004] (2) Weak rigidity products are very prone to flange edge curling and instability during the flanging process;

[0005] (3) The traditional method of cold drawing and deep drawing the product into multiple parts using separate molds and then welding them into a whole will result in poor roundness of the product; Spin forming of such curved busbar components requires multiple annealing processes, and spin forming of high-temperature alloys is difficult, and the precision at the large end diameter is low for products with diameters exceeding 1m; The internal high pressure bulging method is difficult to form for high-temperature alloys, requires large internal pressure, complex sealing structure, high requirements for professional equipment, and high overall cost, and will also have springback problems.

[0006] In summary, for large-size, low-rigidity high-temperature alloy curved busbar structures, it is necessary to design and optimize forming methods and devices to avoid problems such as large springback, inaccurate positioning, and local instability during the forming process, so as to achieve low-cost and high-precision manufacturing of single-wall segment products. Summary of the Invention

[0007] The purpose of this invention is to overcome the aforementioned difficulties and provide a method and apparatus for forming large-size high-temperature alloy curved busbar single-wall segment products. This solves the problems of low forming accuracy, complex forming process, and high manufacturing cost in the batch trial production of existing large-size curved busbar single-wall segment products. The product obtained by this invention has high dimensional accuracy, short forming cycle, and low manufacturing cost, making it suitable for mass production.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0009] A method for forming a large-size high-temperature alloy curved busbar single-wall section product includes:

[0010] S1 prepares a fan-shaped unfolding material;

[0011] S2 rolls and bends the fan-shaped material into a cone shape and then welds them together.

[0012] S3 performs flanging on the cone, with a flanging angle of 30° to 35°.

[0013] S4 performs bulging shaping on the product obtained by flanging;

[0014] S5 performs solution treatment on the product obtained by expansion forming, and then uses a second expansion forming method to correct the shape to reduce springback, thus obtaining a single-wall segment product.

[0015] Furthermore, in step S2, several fan-shaped unfolded materials are divided into two groups. The fan-shaped unfolded materials in each group are welded together to obtain two flat plates. These two flat plates are then rolled and bent separately. The seam accuracy of the two rolled and bent flat plates is within 0.5mm. The two flat plates are then combined and welded together to obtain a cone. The method of dividing the material into two groups for rolling and bending is due to the high springback of the high-temperature alloy and the large diameter of the product. The presence of straight sections in the bending process can easily lead to poor seam gaps. High-temperature alloy semi-finished products can be welded using either laser welding or electron beam welding.

[0016] Furthermore, in step S3, the product needs to be flanged to ensure that the bulging process provides sufficient blank holder force. If the flanging size is too small, it will not provide enough blank holder force, and if it is too large, it will easily cause the flanging to tear. The recommended value is 8% to 10% * the large end diameter, and the preferred flanging size is 130 ± 10 mm. A rolling rib should be set at 5% to 7% * the large end diameter.

[0017] The root of the flange is set to a rounded corner of R8 to R12.

[0018] Furthermore, during step S4, when the bulging process is completed, the blank holder force is 400-600T, the bulging speed is 5mm / s, and the bulging force is set to 700-900T.

[0019] Furthermore, in step S5, after the expansion and forming, a solution treatment is performed, with a solution holding temperature of 948℃~952℃ and a holding time of 20~30min; the cooling method is air cooling.

[0020] In step S6, the solution-treated product is expanded and shaped after the solution is dissolved. The product is rotated 90° around the height Z direction to perform quadrant transformation and then expanded and shaped again to achieve the shaping.

[0021] A forming apparatus for a large-size curved busbar single-wall section product is used to realize the above-mentioned forming method for a large-size curved busbar single-wall section product, including a flanging die, a female die, and a bulging die;

[0022] The flanging die and the female die are used to achieve flanging; the female die and the bulging die are used to achieve bulging.

[0023] Furthermore, the flanging die includes a flanging male die and a wedge-tightening male die;

[0024] During the flanging process, the cone is placed in the female mold, and the outer surface of the wedge-tight male mold is matched with the inner surface of the large end of the cone to press the large end of the cone onto the wedge-tight female mold, thereby achieving the positioning and wedge-tightening of the cone. The flanging male mold is installed above the wedge-tight male and female molds, and the large end of the cone is flanged after the wedge-tightening process is completed.

[0025] Furthermore, the female mold is a shared device for the flanging and bulging processes, including a wedge-tightening female mold, a bulging female mold, and a positioning pad;

[0026] Along the direction from the large end to the small end, the inner surface of the bulging female mold successively includes a first straight wall area, a first curvature area, a forming surface area, a second curvature area, and a second straight wall area; the forming surface area has the same shape as the outer surface of the product design; the first and second curvature areas are the surfaces after the designed outer surface is smoothly extended and offset towards the inner surface by 0.75 to 0.85t (t is the blank thickness); the first and second straight wall areas are the surfaces where the curvature area extends towards the large and small ends until the angle between the surface of the first and second straight wall areas and the product axis transitions to 0°;

[0027] The wedge-tightening female mold is connected to the top of the bulging female mold. During the flanging process, the wedge-tightening male mold presses the large end of the cone cylinder against the inner surface of the wedge-tightening female mold.

[0028] The positioning pad is set at the bottom of the bulging female mold and is used to cooperate with the small end of the cone to achieve positioning and support of the cone;

[0029] The bulging die is used to bulge and shape the outer surface of a cone.

[0030] Furthermore, the dimensions of the first curvature region and the second curvature region along the product axis are 5% to 9%h, preferably 50 to 90 mm; the dimensions of the first straight wall region and the second straight wall region along the product axis are 5% to 8%h, preferably 50 to 80 mm; h is the theoretical height of the product.

[0031] The pad is a structural component for support, positioning, and material ejection. It only needs to have a certain rigidity, and its size can be rounded up.

[0032] Furthermore, the bulging die includes a bulging male die, a pressure ring, and a flipping block;

[0033] The bulging male mold is located inside the cone cylinder. The outer surface of the bulging male mold has the same shape as the inner surface of the product design and needs to be adapted to the surface of the bulging female mold.

[0034] The pressure ring is installed above the wedge-tightening female mold to flatten the flange formed in step S3;

[0035] After the product is formed, it is pressed tightly against the bulging male mold. When demolding, the product carrying the bulging male mold is flipped up and down. The flipping block is used to fix the pressure ring to the top of the bulging male mold before flipping, so as to prevent the pressure ring from squeezing the product during the flipping process.

[0036] Compared with the prior art, the present invention has at least one of the following advantages:

[0037] (1) This invention creatively proposes a forming method for large-size curved busbar single-wall section products. Through the forming method of roll bending and welding - flanging and bulging - solution treatment and straightening and the integrated device, the precision forming of the product is effectively realized. The product's shape and position dimensional accuracy and mechanical properties meet the requirements of use.

[0038] (2) The process of this invention is stable and suitable for mass production;

[0039] (3) This invention avoids circumferential tearing and root wrinkling during flanging by optimizing the design of the flanging process and tooling, thus ensuring the stability of subsequent processes.

[0040] (4) The present invention designs a surface springback control and positioning device, which has high positioning accuracy and low product springback.

[0041] (5) The present invention uses the same female mold in the bulging and flanging process, which effectively reduces the forming cycle and manufacturing cost;

[0042] (6) The present invention enables the product to follow the mold to flip through the flipping block, and the product accuracy is not affected during the flipping process.

[0043] (7) The present invention has significant advantages over spinning forming and internal high pressure bulging curved busbar structure: it overcomes the problems of difficult spinning forming of high temperature alloy curved busbar structure and poor accuracy of large end diameter of spinning, and overcomes the problems of complex mold structure and high manufacturing cost of internal high pressure forming of high temperature alloy curved busbar structure. Attached Figure Description

[0044] Figure 1 Schematic diagram of a large-size curved busbar single-wall section product;

[0045] Figure 2 This is a flowchart of the forming method for a large-size curved busbar single-wall section product according to the present invention;

[0046] Figure 3 This is a schematic diagram of the flange of the present invention;

[0047] Figure 4 This is a schematic diagram of the bulging process of the present invention;

[0048] Figure 5 This is a drawing of the flange mold for the present invention;

[0049] Figure 6This is a schematic diagram of the flange angle design of the present invention; wherein (a) is a simulation diagram when the flange angle is 20°, (b) is a simulation diagram when the flange angle is 25°, and (c) is a simulation diagram when the flange angle is 30°.

[0050] Figure 7 This is a simulation diagram of the flange and rounded corner design of the present invention;

[0051] Figure 8 This is a schematic diagram of the female mold of the present invention;

[0052] Figure 9 This is a schematic diagram of the bulging mold of the present invention;

[0053] In the figure, 1-flanged male mold, 2-wedge-tightening male mold, 3-wedge-tightening female mold, 4-bulging female mold, 5-positioning pad, 6-first straight wall, 7-first curvature zone, 8-theoretical surface zone, 9-second curvature zone, 10-second straight wall zone, 11-bulging male mold, 12-pressure ring, 13-flanging block. Detailed Implementation

[0054] The features and advantages of the present invention will become clearer and more apparent from the following detailed description.

[0055] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0056] This invention provides a method and apparatus for forming large-size, weakly rigid curved busbar single-walled segments, aiming to solve the problems of large springback, easy instability, and poor assembly accuracy in products such as single-walled segments of rocket engines. The application of this method and apparatus provides an effective solution for high-precision forming, springback control, roundness improvement, and quality stability of large-size curved busbar single-walled segment products.

[0057] For products with dimensions exceeding 1.5m, severe springback of high-temperature alloys, and stringent requirements for roundness, this invention employs a roll-bending conical tube followed by overall bulging. During bulging, to prevent inaccurate product positioning and material downward flow, flanging is necessary. For flanging of weakly rigid conical parts, instability due to rolling at the flange edge and shearing cracking at the flange root are highly likely. Flanging angle, flanging size, springback control, tooling flipping, and forming parameters are all key aspects of this invention. The specific flow of the forming method for large-size curved busbar single-wall section products of this invention is as follows: Figure 2 As shown, it mainly includes:

[0058] 1) Roll-bending cone: The flat plates are rolled and bent to form a whole, and the seam accuracy is controlled within 0.5mm. The cone is then welded into a whole by high-energy beam welding, and the residual stress of the weld is removed by solution treatment.

[0059] 2) Flanging: To ensure sufficient blank holder force during the bulging process, the flanging dimension is 130±10mm (8%~10% * large end diameter), and a calendering rib is required at 5%~7% * large end diameter. Figure 3 );

[0060] First, place the cone cylinder inside the female mold and align it according to the position of the pad block;

[0061] The male mold is wedged downwards with a wedge force of 200T. The cone-shaped wedge facilitates flange edge flipping.

[0062] The flanged male mold descends at a speed of 5mm / s, with a flange angle of 30°.

[0063] Unload the pressure, lift the male mold, and the flanging is completed;

[0064] Simply replace the flanged male mold with an expansion male mold to prepare for expansion.

[0065] 4) Bulging: During bulging, material tends to flow downwards and accumulate. Therefore, a suitable blank holder force must be set to control the bulging speed. Figure 4 ).

[0066] Replace the bulging male mold;

[0067] The pressure ring moves downwards, flattening and flanging the edge, providing a pressure force of 500T;

[0068] The bulging male mold descends at a bulging speed of 5 mm / s and a bulging force setting of 800 T.

[0069] After bulging to the bottom, remove the part and check the surface accuracy.

[0070] 5) Solution treatment and straightening: After the material is removed from the mold after bulging, it will spring back. To address this, a solution treatment is performed at 950℃ to eliminate internal stress, and then the bulging and straightening process is repeated.

[0071] This invention integrates flanging, bulging, and flipping functions into a single tooling, reducing the mold change cycle between processes and lowering manufacturing costs.

[0072] 1) The flanging die is a flanging forming component. Flanging effectively provides pressure support for the bulging process, allowing the material to deform fully. The flanging die consists of a flanging male die 1, a wedge-clamping male die 2, etc. Figure 5 After wedging the male and female molds to position the cone, tighten them. Then, use the male mold to flanging the cone at a 30° angle. This is because when the flanging angle is less than 30°, the edge of the cone flange will curl and become unstable during the flanging process. Figure 6As shown, material wrinkling is obvious at flange angles of 20° and 25°; at the same time, the angle should not be too high, otherwise the flange will not be fully formed, which will affect the application of the pressing force during bulging. The radius of the flange root is R10. A radius must be set at this point, otherwise the flange root is very prone to wrinkling at this position. Figure 7 ).

[0073] 2) The female mold is a combined flanging and bulging device. The shape of the female mold directly determines the accuracy of the final formed product. It consists of a wedge-clamping female mold 3, a bulging female mold 4, and positioning pads 5, etc. Figure 8 The wedge-tightening die is used to apply wedge force to fix the cone during flanging, positioning the cone's bulging position while preventing material from flowing downwards and piling up under drawing force. The positioning pad is used to position the cone during flanging, directly supporting the small end of the cone. The bulging die is used for high-precision forming of the final bulging surface. The first straight wall zone 6 and the second straight wall zone 10 of the bulging die cause significant turning deformation during product forming, acting as a material-closing mechanism. The forming gap of the first curvature zone 7 and the second curvature zone 9 of the bulging die is 0.75–0.85t (t is the material thickness), effectively correcting bending and preventing springback. The theoretical surface zone 8 (i.e., the forming surface zone) has the same shape as the designed outer surface of the product. The design of the bulging die surface is mainly to prevent springback. Trial production results show that adding a curvature transition zone at the large and small ends of the product to control the forming gap has a good effect on controlling springback. Meanwhile, regarding the design of the bulging amount (maximum bulging amount = cone diameter at the maximum diameter of the generatrix / maximum diameter of the generatrix * 100%), it is recommended that the maximum bulging amount be controlled between 4.0% and 15%. This is because the larger the bulging amount, the more severe the wall thickness reduction, and excessive thinning can easily lead to product failure. For materials such as high-temperature alloys, when the bulging amount is between 4.0% and 9%, the wall thickness reduction is basically consistent with the bulging amount; when the bulging amount exceeds 10%, the wall thickness reduction will increase exponentially.

[0074] 3) The bulging mold is a bulging forming component, consisting of a bulging male mold 11, a pressure ring 12, a flipping block 13, etc. Figure 9 The blank holder ring provides the blank holder force, flattening the tapered flange edge during the flanging process. The bulging male die is used for the final bulging forming of the product, and it works in conjunction with the curvature area and straight wall area of ​​the bulging female die to complete the shaping of the curved generatrix product. The flipping block is used to flip the formed product. After the product is formed, it is tightly attached to the bulging male die. The flipping block is used to fix the bulging male die and the blank holder ring, preventing the blank holder ring from squeezing the product during the flipping process.

[0075] In summary, the forming method of rolling-flanging-bulging-solid solution straightening proposed for large-size, weakly rigid curved busbar single-wall segment products, and the developed integrated flanging and bulging device are key to realizing the forming of curved busbar single-wall segment products.

[0076] This invention effectively achieves precision forming of products through a forming method and integrated device involving roll bending, flanging, bulging, and solution treatment. It enables mass production, ensures stable process conditions, and guarantees that the product's dimensional accuracy and mechanical properties meet usage requirements. The dimensional accuracy of products obtained using this method is ≤0.3mm, improving overall assembly accuracy; the product's mechanical properties are not less than 5% of the base material's, and the wall thickness reduction does not exceed 5% of the base material's; the product exhibits low springback and high shaping accuracy; shared molds effectively reduce forming cycle time and manufacturing costs; and mold flipping is possible without affecting product accuracy during the flipping process.

[0077] Example:

[0078] The forming method for large-size curved busbar single-wall section products in this embodiment includes the following steps:

[0079] (1) Blank preparation and welding: Laser cutting mechanism for fan-shaped unfolded material; Due to the limitation of the rolling raw material plate width, high-energy beam welding of flat plate is required. After welding, there are two flat plates, which contain 2 and 3 fan-shaped unfolded materials respectively.

[0080] (2) Roll bending cone: The two flat plates are rolled and bent respectively, with a seam accuracy within 0.5mm;

[0081] (3) Cone tube assembly welding: High-energy beam welding of two longitudinal welds on the cone tube;

[0082] (4) Solution treatment: Holding temperature 949℃-952℃; Holding time 20min; Cooling method: air cooling.

[0083] (5) Flanging: Flanging size 130+10mm, flanging angle 30°, wedge clamping force 200T, flanging speed 5mm / s, segmented pressing;

[0084] (6) Bulging forming: Blank pressure 500T, bulging speed 5mm / s, drawing force set value 800T;

[0085] (7) Solution treatment: Holding temperature 949℃-952℃; Holding time 20min; Cooling method: Air cooling.

[0086] (8) Shaping process: bulging speed 5mm / s, drawing force set value 800T, 90° rotation and pressing;

[0087] (9) Dimensional inspection: Inspecting geometric dimensions, contour dimensions, and wall thickness distribution;

[0088] (10) Product flipping: The molded product is flipped until the large end is flush with the ground;

[0089] (10) Packaging and delivery.

[0090] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

[0091] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A method for forming a large-size high-temperature alloy curved busbar single-wall segment product, characterized in that, include: S1 prepares a fan-shaped unfolding material; S2 rolls and bends the fan-shaped material into a cone shape and then welds them together. S3 performs flanging on the cone, with a flanging angle of 30°~35°; S4 performs bulging shaping on the product obtained by flanging; S5 performs solution treatment on the product obtained by expansion forming, and then uses a second expansion forming method to correct the shape and reduce springback, thus obtaining a single-wall segment product. The forming method for large-size high-temperature alloy curved busbar single-wall segment products is implemented using a forming device for large-size curved busbar single-wall segment products; the forming device for large-size curved busbar single-wall segment products includes a flanging die, a female die, and a bulging die; The flanging die and the female die are used to achieve flanging; the female die and the bulging die are used to achieve bulging. The female mold is a shared device for the flanging and bulging processes, including a wedge-tightening female mold, a bulging female mold, and a positioning pad; Along the direction from the large end to the small end, the inner surface of the bulging female mold successively includes a first straight wall area, a first curvature area, a forming surface area, a second curvature area, and a second straight wall area; the forming surface area has the same shape as the outer surface of the product design; the first curvature area and the second curvature area are the surfaces obtained by smoothly extending the outer surface of the design to both ends and then offset inward by 0.75~0.85t, where t is the thickness of the blank; the first straight wall area and the second straight wall area extend from the first curvature area towards the large end of the cone and from the second curvature area towards the small end of the cone, respectively, until the angle between the surface of the first straight wall area and the product axis transitions to 0°. The wedge-tightening female mold is connected to the top of the bulging female mold. During the flanging process, the wedge-tightening male mold presses the large end of the cone cylinder against the inner surface of the wedge-tightening female mold. The positioning pad is set at the bottom of the bulging female mold and is used to cooperate with the small end of the cone to achieve positioning and support of the cone; The bulging die is used to bulge and shape the outer surface of a cone.

2. The forming method for a large-size high-temperature alloy curved busbar single-wall section product according to claim 1, characterized in that, In step S2, several fan-shaped unfolded materials are divided into two groups. After welding the fan-shaped unfolded materials in each group, two flat plates are obtained. The two flat plates are then rolled and bent. The seam accuracy of the two flat plates after rolling and bending is within 0.5mm. The two flat plates are then combined and welded to obtain a cone.

3. The forming method for a large-size high-temperature alloy curved busbar single-wall section product according to claim 1, characterized in that, In step S3, the flange size a = (8%~10%) d 1; in d 1 represents the diameter of the large end of the cone; The root of the flange is set to a radius of R8~R12.

4. The forming method for a large-size high-temperature alloy curved busbar single-wall section product according to claim 1, characterized in that, During step S4, when forming the expansion, the blank holder force is 400~600T, the expansion speed is 5mm / s, and the expansion force is set to 700~900T.

5. The forming method for a large-size high-temperature alloy curved busbar single-wall section product according to claim 4, characterized in that, In step S5, after expansion and forming, a solution treatment is performed at a temperature of 948℃~952℃ for 20~30 minutes, and air cooling is used for cooling. The product is shaped by rotating it 90° around the height Z direction after solution treatment, performing quadrant transformation, and then expanding it again.

6. A forming device for a large-size high-temperature alloy curved busbar single-wall section product, characterized in that, A method for forming a large-size high-temperature alloy curved busbar single-wall section product as described in any one of claims 1-5 includes a flanging die, a female die, and a bulging die; The flanging die and the female die are used to achieve flanging; the female die and the bulging die are used to achieve bulging. The female mold is a shared device for the flanging and bulging processes, including a wedge-tightening female mold, a bulging female mold, and a positioning pad; Along the direction from the large end to the small end, the inner surface of the bulging female mold successively includes a first straight wall area, a first curvature area, a forming surface area, a second curvature area, and a second straight wall area; the forming surface area has the same shape as the outer surface of the product design; the first curvature area and the second curvature area are the surfaces obtained by smoothly extending the outer surface of the design to both ends and then offset inward by 0.75~0.85t, where t is the thickness of the blank; the first straight wall area and the second straight wall area extend from the first curvature area towards the large end of the cone and from the second curvature area towards the small end of the cone, respectively, until the angle between the surface of the first straight wall area and the product axis transitions to 0°. The wedge-tightening female mold is connected to the top of the bulging female mold. During the flanging process, the wedge-tightening male mold presses the large end of the cone cylinder against the inner surface of the wedge-tightening female mold. The positioning pad is set at the bottom of the bulging female mold and is used to cooperate with the small end of the cone to achieve positioning and support of the cone; The bulging die is used to bulge and shape the outer surface of a cone.

7. The forming device for a large-size high-temperature alloy curved busbar single-wall section product according to claim 6, characterized in that, Flanging dies include flanging male dies and wedge clamping male dies; During the flanging process, the cone is placed in the female mold, and the outer surface of the male mold is wedged to fit with the inner surface of the large end of the cone, pressing the large end of the cone onto the female mold to achieve positioning and wedge clamping of the cone. The flanging male mold is installed above the wedge clamping male mold and female mold, and the large end of the cone is flanged after the wedge clamping process is completed.

8. The forming device for a large-size high-temperature alloy curved busbar single-wall section product according to claim 6, characterized in that, The dimensions of the first and second curvature zones along the product axis are h0 = (5%~9%)h, and the dimensions of the first and second straight wall zones along the product axis are h1 = (5%~8%)h, where h is the theoretical height of the product.

9. The forming device for a large-size high-temperature alloy curved busbar single-wall section product according to claim 6, characterized in that, The bulging die includes a bulging male die, a pressure ring, and a flipping block; The bulging male mold is located inside the cone cylinder. The outer surface of the bulging male mold has the same shape as the inner surface of the product design and is adapted to the surface of the bulging female mold. The pressure ring is installed above the wedge-tightening female mold to flatten the flange formed in step S3; After the product is formed, it is pressed tightly against the bulging male mold. When demolding, the product carrying the bulging male mold is flipped up and down. The flipping block is used to fix the pressure ring to the top of the bulging male mold before flipping, so as to prevent the pressure ring from squeezing the product during the flipping process.

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