Roll bending forming process for U-shaped von Karman variable curvature curve profile frame

Abstract

The invention provides a U-shaped von Karman variable curvature curve profile frame roll bending forming process. The U-shaped von Karman variable curvature curve profile frame roll bending forming process comprises the following steps that S1, hard material roll bending forming is adopted for raw materials of a U-shaped frame; s2, the blanking size of the U-shaped frame is limited; s3, performing segmentation processing on the U-shaped frame curve by adopting a radius fitting method; s4, roll bending is conducted on the U-shaped frame, and the arc length compensation of each section is prolonged; and S5, different reduction values are added to the radius of each section of each pass of roll bending of the U-shaped frame, and the von Karman curve U-shaped frame is obtained. The von Karman curve variable curvature U-shaped frame has the beneficial effects that a hard material roll bending forming process is adopted to replace a stretch bending forming process, the part forming precision can be improved, the production efficiency is improved, the quenching procedure in the stretch bending forming process is omitted, and the production cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of U-shaped profile frame forming technology, and in particular relates to a U-shaped von Karman variable curvature curve profile frame rolling forming technology. Background Art

[0002] The fairing shell section of the launch vehicle consists of two half-shells, which are connected by a U-shaped profile frame with a von Karman curve shape, and the precision requirement is high. The profile frame section is a hollow U-shaped frame with a thin wall thickness of 2mm, two oblique conical bosses at the opening, a high vertical edge height of 64mm, a narrow bottom edge width of 26mm, and a contour shape of a von Karman variable curvature curve. The curve formula is:

[0003]

[0004] In the formula

[0005] The part is bent sideways, and the cross section and contour curve of the part are as follows Figure 1 shown.

[0006] The Von Karman curve U-shaped frame originally adopted the stretch-bending forming process. The raw material of the profile is 2A12 aluminum alloy, O-state material. It needs to be quenched before stretch-bending. After stretch-bending, it undergoes natural aging and the material state changes to T4 state, i.e. hard state. The stretch-bending forming process is: blanking - quenching - filling - stretch-bending forming - trimming parts - cutting allowance - packaging and delivery. The stretch-bending forming process can only use O-state material, i.e. soft material, after quenching treatment and stretch-bending. After quenching, the stretch-bending forming and trimming work must be completed within 1.5 hours. If it exceeds 1.5 hours, the parts will harden and cannot be trimmed, and the production efficiency is low.

[0007] Since the profile frame is a hollow U-shaped frame with a thin wall thickness, it has a large deformation after quenching. After quenching, the profile cross-section is twisted, some arc segments are closed, and some arc segments are open. After quenching, the hollow part of the profile needs to be filled and then stretched and bent. The closed part cannot be filled, and the closed part needs to be manually supported and shaped. Filling is difficult. Due to the large quenching deformation, the stretching and bending process cannot correct all arc segments. At the closed and open parts with large deformation, there are still bulges on the surface of the part after stretching and bending. In addition, the part contour has uneven rebound due to variable curvature, and the gap between the contour of the two ends of the part and the arc template is large, with the maximum being 10mm (the gap between the contour and the arc template is required to be ≤1.5mm). Figure 2 As shown, the overall contour of the part needs to be manually calibrated. The manual calibration is done by hammering. After trimming, the hammer mark on the surface of the U-shaped frame is obvious, the bulging and waviness of the edge is as large as 1.2mm (the waviness is required to be ≤0.3mm), and the part fits poorly. Figure 3 As shown, the vertical edge of the part needs to be bonded to the fairing half cover later. The difference in waviness directly affects the bonding quality, and the scrap rate is as high as 40%. Summary of the invention

[0008] In view of this, the present invention aims to propose a U-shaped von Karman variable curvature curve profile frame roll bending forming process to solve the problems of the existing soft material quenching and stretch bending forming process for the von Karman variable curvature curve U-shaped frame, large quenching deformation, cross-section twisting, uneven contour rebound, poor precision after stretch bending, requiring a lot of manual trimming, large bulging and waviness of the part surface, poor forming precision, low production efficiency, and high part scrap rate. For the von Karman variable curvature curve U-shaped frame, a hard material segmented compensation progressive rolling method is adopted to segmentally compensate for radius rebound and elongation, reasonably design rolling process parameters, eliminate heat treatment quenching procedures, do not require manual trimming, roll-bending parts with high dimensional precision, and improve product qualification rate.

[0009] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0010] A U-shaped von Karman variable curvature curve profile frame roll bending forming process comprises the following steps:

[0011] S1. The raw materials of the U-shaped frame are formed by rolling and bending hard materials;

[0012] S2, limit the blanking size of the U-shaped frame;

[0013] S3, using radius fitting method to process the U-shaped frame curve in sections;

[0014] S4, rolling and bending the U-shaped frame to extend the arc length of each section for compensation;

[0015] S5. Add different reduction values ​​to the radius of each section of each rolling bend of the U-shaped frame to obtain a von Karman curve U-shaped frame.

[0016] Furthermore, in step S1, the roll-bending raw material of the U-shaped frame is 2A12, T4 aluminum alloy.

[0017] Furthermore, in step S2, the outline length of the U-shaped frame is 3442.1 mm, 400 mm margin is added at each end, the total margin is 800 mm, and the total length of the cutting is 4242.1 mm.

[0018] Furthermore, in step S3, the U-shaped frame curve is segmented using a radius fitting method, including:

[0019] The U-shaped frame curve is divided into sections to make a simulation curve, and the U-shaped frame is made according to the accuracy that the deviation between the simulation curve and the theoretical curve is ≤0.1mm;

[0020] The curve is divided into 5 segments, each segment has a radius size, and the original variable curvature curve changes from multiple radii to 5 radii;

[0021] Calculate the 5-stage pressing value to improve forming efficiency;

[0022] The segmented simulation curve sets the process parameters for roll bending.

[0023] Further, in step S4, the U-shaped frame is rolled and extended to compensate for the arc length of each segment, including:

[0024] The outline length of the U-shaped frame after cutting is 3442.1mm, the margin is 800mm, and the total length is 4242.1mm;

[0025] The U-shaped frame adopts the 6-time rolling method. After rolling, the arc length of the center line is 4250.1mm, which is 8mm longer.

[0026] The U-shaped frame is subjected to the method of proportionally reducing the length of each arc segment, and the value of each arc segment is recalibrated before rolling and forming.

[0027] Further, in step S5, different reduction values ​​are added to the radius of each section of each rolling bend of the U-shaped frame to obtain a von Karman curve U-shaped frame, including:

[0028] Rolling forming: First, cut the U-shaped frame, leaving a 400mm margin at both ends;

[0029] Secondly, fill the hollow part of the U-shaped frame;

[0030] Again, set the process parameters for roll bending;

[0031] A total of 6 rolling bends were performed, and the pressure value was set based on the maximum radius R8658.9mm of the 4th section. The pressure value for the first 4 rolling bends was gradually increased by 1mm, and the pressure values ​​for the remaining sections were increased in proportion to the radius of the 4th section.

[0032] Further, in step S5, taking the first rolling and the first section pressing value as an example, the calculation formula is as follows:

[0033] 8658.9 / 1198.3=X / 1;

[0034] X = 7.2 mm;

[0035] After the last two times of rolling, the radius of each section of the U-shaped frame has been close to the target curve, and the increase in the downward pressure value has gradually decreased. The method of increasing the downward pressure in equal proportion and fine-tuning is adopted to compare the U-shaped frame profile with the theoretical curve template, measure the gap value of each section, and increase the downward pressure for the section with smaller gap and reduce the downward pressure for the section with larger gap according to different gap values, so as to roll out the Von Karman curve U-shaped frame;

[0036] Then the total reduction value of the sixth rolling bend in each section is evenly divided into the six rolling bends to solidify the process parameters;

[0037] Taking the first section of the pressing value as an example, the total pressing value of the sixth rolling bending is 34.7mm. Using 34.7 / 6=5.8mm, the pressing value of the first rolling bending is 5.8mm, and the pressing value of the second rolling bending is 5.8+5.8=11.6mm. By analogy, the final pressing value is still 34.7mm.

[0038] Through 6 segmented rolling, the Von Karman curve U-shaped frame is rolled out. The maximum contour gap compared with the sample is 0.4mm. The Von Karman curve U-shaped frame does not require manual trimming, has no waves on the surface, meets the technical index requirements, and has high part forming accuracy.

[0039] Compared with the prior art, the U-shaped von Karman variable curvature curve profile frame roll bending forming process described in the present invention has the following advantages:

[0040] (1) The U-shaped von Karman variable curvature curve profile frame roll bending forming process described in the present invention, the von Karman curve variable curvature U-shaped frame, adopts the hard material roll bending forming process instead of the stretch bending forming process, which can improve the forming accuracy of the parts, improve the production efficiency, save the quenching process in the stretch bending forming process, and reduce the production cost.

[0041] (2) The present invention discloses a U-shaped von Karman variable curvature curve profile frame roll bending forming process, a von Karman curve variable curvature U-shaped frame, which is segmented by a radius fitting method and a proportional reduction compensation method for extending the arc length of each segment by rolling. This can solve the deviation in the growth of the rolling arc length, improve the forming accuracy of the parts, and improve the efficiency of the rolling forming.

[0042] (3) The U-shaped von Karman variable curvature curve profile frame rolling forming process described in the present invention, the von Karman curve variable curvature U-shaped frame, adopts the method of increasing different reduction values ​​for the radius of each section of each rolling process, combined with the weighted average method, which can solidify the process parameters, improve the part production efficiency, effectively reduce the part springback, and improve the part forming accuracy. After the parts are formed, no manual trimming is required, which greatly reduces the labor intensity. The part surface is free of waves and has high quality, which increases the product qualification rate by 40%. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0044] Figure 1 It is a schematic diagram of parts in the prior art;

[0045] Figure 2 It is a schematic diagram of contour springback deformation in the prior art;

[0046] Figure 3 It is a schematic diagram of the cross-section wave deformation of a part in the prior art;

[0047] Figure 4 It is a schematic diagram of the segments according to the embodiment of the present invention;

[0048] Figure 5 The figure is a schematic diagram of the process flow described in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0052] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0053] like Figures 4 to 5 As shown, a U-shaped von Karman variable curvature curve profile frame rolling forming process includes the following steps:

[0054] S1. The raw materials of the U-shaped frame are formed by rolling and bending hard materials;

[0055] S2, limit the blanking size of the U-shaped frame;

[0056] S3, using radius fitting method to process the U-shaped frame curve in sections;

[0057] S4, rolling and bending the U-shaped frame to extend the arc length of each section for compensation;

[0058] S5. Add different reduction values ​​to the radius of each section of each rolling bend of the U-shaped frame to obtain a von Karman curve U-shaped frame.

[0059] Advantages of the present invention:

[0060] (1) The Von Karman curve variable curvature U-shaped frame adopts the hard material rolling forming process instead of the stretch bending forming process, which can improve the forming accuracy of the parts, improve the production efficiency, save the quenching process in the stretch bending forming process, and reduce the production cost.

[0061] (2) The Von Karman curve variable curvature U-shaped frame is segmented by the radius fitting method, and the arc length of each segment is proportionally reduced by the rolling bending extension compensation method, which can solve the deviation of the rolling arc length growth, improve the forming accuracy of the parts, and improve the forming efficiency of the rolling bending.

[0062] (3) The Von Karman curve variable curvature U-shaped frame adopts the method of increasing different reduction values ​​for the radius of each section of each rolling process, combined with the weighted average method, to solidify the process parameters, improve the production efficiency of parts, effectively reduce the springback of parts, and improve the forming accuracy of parts. After the parts are formed, no manual trimming is required, which greatly reduces the labor intensity. The surface of the parts is free of waves and the quality is high, which increases the product qualification rate by 40%.

[0063] Example 1

[0064] The Von Karman variable curvature U-shaped frame adopts a roll-bending forming process, using a three-axis roll-bending machine to bend the parts into various radius sizes by adjusting the displacement of the rollers on both sides.

[0065] Specific technical solution for Von Karman variable curvature U-shaped frame rolling:

[0066] (1) The raw materials are formed by hard material rolling

[0067] The von Karman curve U-shaped frame adopts 2A12, T4 state (hard state) aluminum alloy as the raw material for roll forming. The raw material required for the part is directly rolled in the final state, eliminating the heat treatment process.

[0068] (2) Cutting size

[0069] The outline length of the von Karman curve U-shaped frame is 3442.1mm, with 400mm margin added at each end, the total margin is 800mm, and the total cutting length is 4242.1mm.

[0070] (3) Use the radius fitting method to segment the part curve

[0071] The Von Karman curve U-frame profile is a variable curvature curve, a spline curve, and the radius of each point is different. For roll bending, the radius of each point is different when rolling straight material into a spline curve, which makes the roll bending difficult and inefficient. Therefore, the present invention uses a radius fitting method to segment the part curve to make a simulation curve. This part is divided into 5 segments according to the accuracy of the deviation between the simulation curve and the theoretical curve ≤0.1mm (the accuracy can be in the range of 0.1-0.5mm, and the smaller the accuracy value, the smaller the deviation, the more accurate it is). Each segment has a radius size, so that the original variable curvature curve changes from multiple radii to 5 radii, which is convenient for calculating the pressing values ​​of the 5 segments and improving the forming efficiency. (Note: Yellow is newly added, red is original, and the red part is also an explanation of the segmentation, that is, multiple radii cannot be rolled, and according to the accuracy of the deviation ≤0.1mm, it is divided into 5 segments of simulation curves with similar radii to facilitate rolling)

[0072] The simulation curve after segmentation is as follows Figure 4 As shown, the arc length and radius values ​​of each segment after segmentation are shown in Table 1. Roll bending is performed according to this simulation curve and the process parameters are set.

[0073] Table 1 Segment values ​​of simulation curve

[0074] category 1 segment 2nd segment 3 sections 4 paragraphs 5th paragraph Arc length L / mm 86 364 672.7 1402.1 917.3 Outer radius value R / mm 1198.3 3179.5 6057.6 8658.9 7630.4

[0075] (4) Compensation method of proportionally reducing the length of each arc segment by rolling extension

[0076] After multiple rolling, the arc length of the profile will increase due to the bending force. The outline length of the Von Karman curve U-shaped frame is 3442.1mm, the margin is 800mm, and the total length is 4242.1mm. The part adopts the 6-time rolling method. After rolling, the centerline arc length is 4250.1mm, which is 8mm more. If the radius is set according to the original segment length for rolling, the part profile will have deviations. Therefore, it is proposed to use the proportional reduction method of each segment arc length, recalibrate the arc length value of each segment, as shown in Table 2, and then perform rolling forming.

[0077] Table 2 Contour arc length correction values

[0078] 1 segment 2nd segment 3 sections 4 paragraphs 5th paragraph margin Arc length original value L / mm 86 364 672.7 1402.1 917.3 800 Correction reduction value 0.2 0.7 1.3 2.6 1.7 1.5 Arc length correction value L 85.8 363.3 671.4 1399.5 915.6 798.5 Outer radius R value / mm 1198.3 3179.5 6057.6 8658.9 7630.4 /

[0079] (5) Method of increasing the radius of each section of each rolling pass by different reduction values

[0080] The raw materials for roll bending are transformed from straight materials to materials with variable curvature. Each section needs to be bent to a target radius. Since the radii of each section are different and vary greatly, the springback amount of each rolling is also different. The radius reduction value of each section in the rolling process cannot be the same. The present invention adopts a method of increasing the radius reduction value of each section in each rolling pass.

[0081] According to the above ideas, the roll bending forming is firstly to blank the profile, leaving a 400mm margin at each end; secondly, fill the hollow part of the profile; and thirdly, set the process parameters for roll bending. A total of 6 roll bendings are performed, and the pressure value is set based on the maximum radius R8658.9mm of the 4th section. The pressure value of the first 4 roll bendings is gradually increased by 1mm, and the remaining sections adopt the method of increasing the pressure value in proportion to the radius of the 4th section. (The prior art of this type of variable curvature hollow profile frame adopts the stretch bending forming method, which needs to be quenched before stretch bending, and has a large deformation after quenching. The present invention adopts the hard material roll bending forming method, which does not require heat treatment. For rolling, the segmented fitting radius rolling method is adopted. The maximum radius section is used as a reference to increase the pressure reduction. The other sections adopt the method of increasing the pressure reduction value in proportion to this section. It is convenient to calculate the pressure reduction of each section, so that each section rebounds evenly and improves the forming accuracy.

[0082] After adjusting the process parameters for about 10 products in the early stage of rolling and bending, the process parameters can be solidified and saved on the computer of the stretch-bending equipment to generate a stretch-bending program, which can be used for subsequent rolling and bending, with high efficiency.

[0083] Taking the first rolling and the first section of the pressing value as an example, the calculation formula is as follows:

[0084] 8658.9 / 1198.3=X / 1

[0085] X=7.2mm

[0086] After the last two times of rolling, the radius of each section of the part has been close to the target curve, and the increase in the downward pressure value has gradually decreased. The method of increasing the downward pressure in equal proportion and fine-tuning is adopted to compare the part contour with the theoretical curve template, measure the gap value of each section, and increase the downward pressure for the section with smaller gap and reduce the downward pressure for the section with larger gap according to different gap values. The process parameters are set as shown in Table 3, and the U-shaped frame of the von Karman curve is rolled out.

[0087] Table 3 Rolling process parameters

[0088]

[0089] Then the total reduction value of the sixth rolling bend in each section is evenly divided into the six rolling bends to solidify the process parameters.

[0090] Taking the first section pressure reduction value as an example, the total pressure reduction value of the 6th rolling bending is 34.7mm. Using 34.7 / 6=5.8mm, the pressure reduction value of the first rolling bending is 5.8mm, and the pressure reduction value of the second rolling bending is 5.8+5.8=11.6mm. And so on, the final pressure reduction value is still 34.7mm.

[0091] The process parameters after curing are shown in Table 4.

[0092] Table 4 Rolling process parameters after curing

[0093]

[0094] Through 6 segmented rolling bending, a von Karman curve U-shaped frame is rolled out. Compared with the sample, the maximum contour gap is 0.4mm (the technical indicator requires the contour gap to be ≤1.5mm). The part does not require manual trimming and has no waves on the surface (the technical indicator requires the wave degree to be ≤0.3mm), which meets the technical indicator requirements and has high part forming accuracy.

[0095] The von Karman curve U-shaped frame of the present invention adopts a radius fitting method to segment the variable curvature curve, and divides the curve into 5 sections according to the accuracy of the deviation between the simulation curve and the theoretical curve ≤0.1mm. After segmentation, the curve can be rolled and formed according to the simulation curve.

[0096] The von Karman curve U-shaped frame of the present invention adopts a proportional reduction compensation method for extending the arc length of each segment by rolling to correct the value of the arc length of each segment, thereby solving the problem of part contour deviation caused by arc length growth after multiple rolling of the profile.

[0097] The von Karman curve U-shaped frame of the present invention adopts a method of increasing different reduction values ​​for the radius of each section of each rolling bending process, and the total number of rolling bending is set to 6 times. The first 4 rolling bending radii adopt a method of increasing the reduction value in equal proportion, and the next 2 rolling bending adopts a method of increasing the reduction amount in equal proportion plus fine-tuning, and then a weighted average method of the 6 rolling reduction values ​​is adopted to solidify the process parameters and roll out parts with high dimensional accuracy.

[0098] The von Karman curve U-shaped frame of the present invention has rolling bending process parameters.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A U-shaped von Karman variable curvature curve profile frame rolling forming process, characterized in that: The following steps are involved: S1. The raw materials of the U-shaped frame are formed by rolling and bending hard materials; S2, limit the blanking size of the U-shaped frame; S3, using radius fitting method to process the U-shaped frame curve in sections; S4, rolling and bending the U-shaped frame to extend the arc length of each section for compensation; S5. Add different reduction values ​​to the radius of each section of each rolling bend of the U-shaped frame to obtain a von Karman curve U-shaped frame.

2. The U-shaped von Karman variable curvature curve profile frame roll-bending forming process according to claim 1, characterized in that: In step S1, the roll-bending raw material of the U-shaped frame is 2A12, T4 aluminum alloy.

3. The U-shaped von Karman variable curvature curve profile frame roll-bending forming process according to claim 1, characterized in that: In step S2, the outline length of the U-shaped frame is 3442.1 mm, 400 mm margin is added at each end, the total margin is 800 mm, and the total length of the cutting is 4242.1 mm.

4. The U-shaped von Karman variable curvature curve profile frame roll-bending forming process according to claim 1, characterized in that: In step S3, the U-shaped frame curve is segmented using a radius fitting method, including: The U-shaped frame curve is divided into sections to make a simulation curve, and the U-shaped frame is made according to the accuracy that the deviation between the simulation curve and the theoretical curve is ≤0.1mm; The curve is divided into 5 segments, each segment has a radius size, and the original variable curvature curve changes from multiple radii to 5 radii; Calculate the 5-stage pressing value to improve forming efficiency; The segmented simulation curve sets the process parameters for roll bending.

5. The U-shaped von Karman variable curvature curve profile frame roll-bending forming process according to claim 1, characterized in that: In step S4, the U-shaped frame is rolled and extended to compensate for the arc length of each segment, including: The outline length of the U-shaped frame after cutting is 3442.1mm, the margin is 800mm, and the total length is 4242.1mm; The U-shaped frame adopts the 6-time rolling method. After rolling, the arc length of the center line is 4250.1mm, which is 8mm longer. The U-shaped frame is subjected to the method of proportionally reducing the length of each arc segment, and the value of each arc segment is recalibrated before rolling and forming.

6. The U-shaped von Karman variable curvature curve profile frame roll-bending forming process according to claim 1, characterized in that: In step S5, different reduction values ​​are added to the radius of each section of each rolling bend of the U-shaped frame to obtain a von Karman curve U-shaped frame, including: Rolling forming: First, cut the U-shaped frame, leaving a 400mm margin at both ends; Secondly, fill the hollow part of the U-shaped frame; Again, set the process parameters for roll bending; A total of 6 rolling bends were performed, and the pressure value was set based on the maximum radius R8658.9mm of the 4th section. The pressure value for the first 4 rolling bends was gradually increased by 1mm, and the pressure values ​​for the remaining sections were increased in proportion to the radius of the 4th section.

7. The U-shaped von Karman variable curvature curve profile frame roll-bending forming process according to claim 6, characterized in that: In step S5, taking the first rolling and the first section pressing value as an example, the calculation formula is as follows: 8658.9 / 1198.3＝X / 1； X = 7.2 mm; After the last two times of rolling, the radius of each section of the U-shaped frame has been close to the target curve, and the increase in the downward pressure value has gradually decreased. The method of increasing the downward pressure in equal proportion and fine-tuning is adopted to compare the U-shaped frame profile with the theoretical curve template, measure the gap value of each section, and increase the downward pressure for the section with smaller gap and reduce the downward pressure for the section with larger gap according to different gap values, so as to roll out the Von Karman curve U-shaped frame; Then the total reduction value of the sixth rolling bend in each section is evenly divided into the six rolling bends to solidify the process parameters; Taking the first section of the pressing value as an example, the total pressing value of the sixth rolling bending is 34.7mm. Using 34.7 / 6=5.8mm, the pressing value of the first rolling bending is 5.8mm, and the pressing value of the second rolling bending is 5.8+5.8=11.6mm. By analogy, the final pressing value is still 34.7mm. Through 6 segmented rolling, the Von Karman curve U-shaped frame is rolled out. The maximum contour gap compared with the sample is 0.4mm. The Von Karman curve U-shaped frame does not require manual trimming, has no waves on the surface, meets the technical index requirements, and has high part forming accuracy.

8. An electronic device, comprising a processor and a memory connected to the processor for storing instructions executable by the processor, characterized in that: The processor is used to execute a U-shaped von Karman variable curvature curve profile frame rolling forming process as described in any one of claims 1 to 7.

9. A server, characterized in that: It includes at least one processor and a memory that is communicatively connected to the processor, wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the processor so that the at least one processor performs a U-shaped von Karman variable curvature curve profile frame rolling forming process as described in any one of claims 1-7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, a U-shaped von Karman variable curvature curve profile frame rolling forming process as described in any one of claims 1 to 7 is implemented.

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