Staggered roll bending forming process method for carrier rocket double-side oblique angle special-shaped frame

Abstract

The invention provides a staggered roll bending forming process method for a carrier rocket bilateral oblique angle special-shaped frame. The staggered roll bending forming process method comprises the following steps that S1, a profile frame part is blanked; s2, sectional staggered-distance roll bending forming is conducted on the profile frame part based on roll bending equipment; s3, allowance cutting is conducted on the profile frame part; S4, machining is conducted on the profile frame part; and S5, trimming is conducted on the profile frame part. The method has the beneficial effects that the bilateral oblique angle special-shaped frame adopts a segmented staggered roll bending forming method, the precision of parts after roll bending is high, the internal stress concentration is small, the tip upwarp amount after machining is small, a hydraulic machine displacement moving mode segmented flattening method is combined, the part forming precision is greatly improved, the radius gap after roll bending forming is 0.4 mm, the angle gap is 0.3 mm, the flatness gap is 0.5 mm, and the machining precision is greatly improved. And after the stretch bending forming is manually finished, the radius gap is 1.5 mm, the angle gap is 1mm, and the flatness gap is 1.5 mm.

Description

Technical Field

[0001] The invention belongs to the technical field of roll bending forming of special-shaped frames, and in particular relates to a staggered roll bending forming process method for a double-sided oblique angle special-shaped frame of a launch vehicle. Background Art

[0002] A double-sided beveled special-shaped frame, located in the cone section of the launch vehicle fairing, is composed of two semicircular frames to form a whole frame, involving separation and high precision requirements. Currently, the stretch bending forming process is adopted. The cross section of this profile frame is quite special. The normal profile frame is an angle material with a bottom edge and a vertical edge. This profile frame has two edges, the vertical edge is a bevel edge, the slope is larger at 64°, the thickness is thicker at 8mm, and the cross section is similar to a "C" shape. The cross section of the part is as follows: Figure 1 As shown in (a), the part profile is semicircular, and the radius of the large end is R2500mm. Figure 1 As shown in (b), the profile frame forming is quite special. Normal profile frames can be delivered directly after being drawn and formed. However, after the profile frame is drawn and formed, 5 drainage grooves with a width of 10 mm and a height of 2 mm need to be machined at the bottom of the small end.

[0003] The profile frame was originally formed by stretch bending, and the forming process was: pre-bending - quenching - supplementary stretch bending and finishing - artificial aging - finishing - machining - finishing - inspection - packaging and delivery. There are many forming processes, and the profile frame needs to be processed with multiple drainage grooves due to its special cross-section. There are many forming problems as follows:

[0004] (1) Bending accuracy problem: Since the vertical side of the part is a bevel, the lengths of the upper and lower sides are not equal, the cross section is twisted after bending, and the gap between the bevel and the angle template is about 4mm (the technical indicator requires the angle gap ≤1mm), and the cross section deformation is as follows Figure 2 A lot of manual trimming is required later. Normal profiles have only one bottom edge and one vertical edge. The vertical edge angle and curvature can be corrected by manual trimming. This profile has two edges on the top and bottom, and the bevel is fixed, which leads to the middle bevel angle and contour radius out of tolerance, making it difficult to perform manual trimming later.

[0005] (2) Machining deformation problem: The profile frame surface is special, with 5 drainage grooves at the bottom. The drainage grooves need to be machined after bending. Due to the poor precision of the profile after bending, the manual trimming is large, and the internal stress is concentrated. After machining, the internal stress of the profile is released, and the profile surface is seriously deformed, mainly because the bottom plane of the contour of one end gradually rises, and the amount of rise is 23mm (the technical indicator requires a flatness gap of ≤1.5mm). This profile is thick, double-sided, and the end is raised, making manual trimming difficult and the scrap rate of parts high.

[0006] If the profile is rolled and formed, the profile frame cross-section is rather special. If the normal rolling forming method is used, that is, the rollers are all in the same plane, due to the asymmetric cross-section of the part and the beveled vertical edge, the upper and lower sides of the rolled profile cross-section will be subjected to uneven force and will be distorted, making it impossible to form a part of qualified size.

[0007] Therefore, the present invention proposes a segmented upper and lower offset rolling forming method to offset the uneven force on the upper and lower sides to prevent the profile from twisting, and combines the segmented flattening method with the end displacement mode to correct the end warping and form high-precision parts. Summary of the invention

[0008] In view of this, the present invention aims to propose a staggered rolling forming process method for the double-sided beveled special-shaped frame of a launch vehicle, so as to solve the problems that the double-sided beveled special-shaped frame adopts the existing stretch bending forming process, the forming precision is low, the bottom plane is warped and deformed after machining, the manual trimming is difficult, and the parts scrap rate is high. The profile frame adopts the segmented staggered rolling forming method and combines the flatness segmented downward displacement trimming method, optimizes the mold design, reasonably designs the rolling process parameters and the flatness correction process parameters, and forms parts with high dimensional accuracy.

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

[0010] A staggered rolling bending forming process method for a double-sided oblique angled special-shaped frame of a launch vehicle comprises the following steps:

[0011] S1. Cutting the profile frame parts;

[0012] S2, performing segmented staggered roll-bending of the profile frame parts based on the roll-bending equipment;

[0013] S3. Cutting allowance for profile frame parts:

[0014] Use a saw to cut off the excess at both ends of the profile frame parts, and the total excess at both ends is 1000mm;

[0015] S4. Machining of profile frame parts:

[0016] The drainage notch at the bottom of the small end of the machined profile frame part has a width of 10mm and a height of 2mm;

[0017] S5. Trimming of profile frame parts:

[0018] After machining, the internal stress of the profile frame parts is released, and one end is slightly warped, with a warping amount of 10mm. The internal stress is less than the warping amount of 23mm during stretch bending.

[0019] The hydraulic press displacement movement mode is used to flatten the profile frame parts in sections.

[0020] Furthermore, the rolling and bending equipment is a four-axis horizontal rolling and bending machine, and the roller mold of the four-axis horizontal rolling and bending machine includes a center front roller, a center rear roller, a left roller, a right roller, a left pressure roller and a right pressure roller. The center front roller and the center rear roller are respectively installed to the front and back of the middle of the profile frame part, and the left roller, the right roller, the left pressure roller and the right pressure wheel are respectively installed to the left and right sides of the profile frame part.

[0021] Furthermore, the straight edges and small fillet radii of the middle rear roller, left roller and right roller are changed to beveled large fillet radii, the fillet radius is changed from R2 to R6, the straight edges are changed to beveled edges, the beveled edge parameters are 0.5mm vertically and 20mm horizontally, and a gap of 1mm is left between the upper and lower sides of the profile frame parts and the roller mold to facilitate material extension.

[0022] Furthermore, in step S1, blanking the profile frame parts includes:

[0023] For the profile frame parts, a sawing machine is used to cut the rough material with a length of 8854mm, which includes 7854mm part length and 1000mm margin.

[0024] Further, in step S2, the profile frame parts are subjected to segmented staggered roll bending based on the roll bending equipment, including:

[0025] Divide the arc length of the profile frame parts into sections, set staggered rolling bending process parameters for each section, and reduce the progressive torsion of the vertical edge angle;

[0026] There are three technical indicators for the accuracy of profile frame parts after roll bending, namely, part radius deviation ≤1.5mm, gap between bevel and angle template ≤0.8mm, gap between bottom edge and platform ≤1.5mm. If these three indicators are met, the profile frame parts are qualified.

[0027] Furthermore, the rolling process parameters include the number of rolling times, Y value, left Zn value and right Zn value. The Y value is used to adjust the radius size of the part, the left Zn value is the nth moving distance of the left roller, and the right Zn value is the nth moving distance of the right roller.

[0028] Furthermore, the range of the number of rolling bending times is 6-20 times.

[0029] Furthermore, after each rolling and bending, the profile frame part needs to be placed on a platform to measure the angle value of the profile frame part.

[0030] Furthermore, in step S5, the profile frame parts are flattened in sections using a hydraulic press displacement movement mode, including:

[0031] The hydraulic press has two control modes, namely force control mode and displacement control mode. The displacement control mode is used to control the downward pressure and flatten the warped part in sections.

[0032] As the profile frame is 7854mm long, it is flattened and shaped in multiple stages. As the end of the profile frame has a high amount of warping, the warping decreases towards the middle and there is no warping within 1200mm from the end. Therefore, the process parameters for the downward pressing amount are set in a way that the downward pressing amount is gradually reduced in multiple stages.

[0033] Compared with the prior art, the staggered rolling forming process method for the double-sided beveled special-shaped frame of a launch vehicle described in the present invention has the following advantages:

[0034] (1) The present invention discloses a process for staggered rolling bending of a double-sided beveled special-shaped frame for a launch vehicle. The double-sided beveled special-shaped frame adopts a segmented staggered rolling bending method. The part has high precision after rolling, small internal stress concentration, and small amount of head lift after machining. Combined with the segmented flattening method in the displacement mode of a hydraulic press, the forming precision of the part is greatly improved. After rolling, the radius gap is 0.4 mm, the angle gap is 0.3 mm, and the flatness gap is 0.5 mm, which are higher than the stretch bending forming precision. After manual trimming of the stretch bending forming, the radius gap is 1.5 mm, the angle gap is 1 mm, and the flatness gap is 1.5 mm.

[0035] (2) The invention discloses a method for staggered rolling and bending a double-sided beveled special-shaped frame for a launch vehicle. The double-sided beveled special-shaped frame is formed by segmented staggered rolling and bending, and does not require manual trimming, which greatly reduces the labor intensity of workers and improves production efficiency.

[0036] (3) The invention discloses a method for staggered rolling and bending a double-sided beveled special-shaped frame for a launch vehicle. After the double-sided beveled special-shaped frame is machined, a hydraulic press displacement mode segmented flattening method is used, which effectively solves the problem of the head curling after the part is machined, and improves the product qualification rate by 30%.

[0037] (4) The invention discloses a method for staggered rolling and bending of a double-sided beveled special-shaped frame for a launch vehicle. The contact surface between the double-sided beveled special-shaped frame mold and the bottom edge of the profile is designed as a beveled large radius solution, which can effectively solve the problem of profile rolling abrasive and improve the surface quality of parts. A gap is left between the upper and lower sides of the part and the mold to facilitate material extension. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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:

[0039] Figure 1 It is a schematic diagram of parts in the prior art;

[0040] Figure 2 It is a schematic diagram of cross-sectional deformation in the prior art;

[0041] Figure 3 A schematic top view of the rolling bending according to an embodiment of the present invention;

[0042] Figure 4 A cross-sectional schematic diagram of rolling bending according to an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the rolling bending die before improvement according to an embodiment of the present invention;

[0044] Figure 6 It is a schematic diagram of an improved rolling bending die according to an embodiment of the present invention;

[0045] Figure 7 It is a schematic diagram of the hydraulic press end tip being lifted and flattened according to an embodiment of the present invention;

[0046] Figure 8 The present invention is a flowchart of the method described in the embodiment of the present invention. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

[0050] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0051] like Figures 3 to 8 As shown, a staggered rolling forming process method for a double-sided beveled special-shaped frame of a launch vehicle is disclosed. The cross-section of the profile frame is relatively special. The normal rolling forming method is adopted, that is, the rollers are all in the same plane. Since the cross-section of the part is asymmetrical and the vertical edge is a beveled edge, the upper and lower sides of the rolled profile cross-section are subjected to uneven force and will be twisted. Therefore, a segmented upper and lower staggered rolling forming method is proposed to offset the uneven force on the upper and lower sides and prevent twisting.

[0052] The rolling equipment uses a four-axis horizontal rolling machine, and the rollers are divided into the front roller, the rear roller, the left roller, the right roller, the left pressure roller and the right pressure roller. The profile rolling forming is to bend the straight material into the target radius while ensuring that the angle of the bevel and the flatness of the bottom edge meet the requirements of the drawing. Through multiple rolling, the forward movement distance (Y value) of the left and right rollers is adjusted each time, so that the radius of the profile is gradually reduced until the target radius is reached. At the same time, the height difference (Z value) between the left and right rollers is adjusted each time, so that the angle of the bevel and the flatness of the bottom edge of the profile gradually meet the target value. The rolling diagram is shown as follows Figure 3 to Figure 4 shown.

[0053] 1. Mould optimization plan:

[0054] Normally, the bending die is consistent with the cross-sectional dimensions of the profile. During the feeding process of the double-sided beveled special-shaped frame, the parts need to be corrected for misalignment and distortion after entering the rollers. Before entering the rollers, the bottom edge of the parts will rub against the rollers, causing scratches on the bottom edge. Therefore, the contact surface between the middle and rear rollers, the left roller, and the right roller dies and the bottom edge of the profile was improved. The straight edge and small fillet radius were changed to a beveled edge with a large fillet radius. The fillet radius was changed from R2 to R6, and the straight edge was changed to a beveled edge. The beveled edge parameters are 0.5mm vertically and 20mm horizontally. A 1mm gap is left between the upper and lower sides of the part and the die to facilitate material extension. The left roller is shown before and after the improvement. Figures 5 and 6 As shown in the figure, this innovative change of the mold can effectively solve the problem of bottom edge abrasive during part rolling and improve the surface quality of the parts.

[0055] 2. The specific technical scheme of roll bending is as follows:

[0056] (1) The length of the raw material is 8854 mm, which includes 7854 mm part length and 1000 mm margin.

[0057] (2) Segmented staggered rolling forming

[0058] There are three technical indicators for the accuracy of the part after rolling forming, namely, the radius deviation of the part ≤1.5mm, the gap between the bevel and the angle template ≤0.8mm, and the gap between the bottom edge and the platform ≤1.5mm. If these three indicators are met, the part is qualified.

[0059] Due to the special cross-section of the part, it is a double-sided profile with a beveled edge, and the diameter of the part is large. The arc length of the raw material is 8854mm. For such a long part with this cross-section, the vertical edge angle is easy to show a small progressive twist from one end to the other. In order to improve the forming accuracy of the part, the arc length of the part is segmented, and the offset rolling process parameters are set for each segment to reduce the progressive twist of the vertical edge angle and improve the forming accuracy of the part. The arc length of the profile of this part is divided into 3 sections, the total length of the part is 7854mm, and the length of each section is 2618mm. The height difference between the left and right rollers is different for each arc length of each rolling. The height difference between the left and right rollers directly affects the angle and flatness of the part. If the difference is unreasonable, it will cause uneven angles and flatness of each section of the part. Through multiple tests, the process parameters are solidified to make the bevel angle and bottom flatness values ​​uniform within the entire arc length of the profile, and the accuracy is improved. The setting of the segmented rolling process parameters is shown in Table 1.

[0060] Table 1 Process parameters of segmented rolling of special-shaped frames

[0061]

[0062] The Y value in the table is used to adjust the radius size of the part. The Y value gradually increases and the radius of the part gradually decreases until it meets the technical index requirements. After 8 rolling bends, the final radius deviation is 0.4mm, which meets the technical index requirements.

[0063] Left Z1 is the first moving distance of the left roller, right Z1 is the first moving distance of the right roller, left Z2 is the second moving distance of the left roller, right Z2 is the second moving distance of the right roller, left Z3 is the third moving distance of the left roller, right Z3 is the third moving distance of the right roller, upward movement is a positive value, downward movement is a negative value. As can be seen from Table 1, the right roller is higher than the left roller in each arc segment of each rolling bend, the left and right roller values ​​of arc segments 1 and 3 (the two end arc segments) are the same, and the difference between the left and right rollers of arc segments 2 (the middle arc segment) at both ends is greater than the middle arc. The difference between the left and right rollers of the arc segments at both ends of the first 5 rolling bends is 4.2mm, and the difference between the left and right rollers of the middle arc is 3mm. The difference between the left and right rollers of the arc segments at both ends of the last 3 rolling bends is 4mm, and the difference between the left and right rollers of the middle arc is 2.8mm. The difference between the left and right rollers of the arc segments at both ends is greater than the middle arc, which can effectively correct the warping of the end portion. From the 1st to the 8th rolling, the left and right rollers move downward all the time. The first 5 times increase the value more, and the last 3 times are the fine-tuning stage, with less increase. (Specifically, the process parameters are set according to the above rules, and the solidified process parameters are obtained after multiple tests. The solidified process parameters are saved in the four-axis rolling machine, and the rolling program is generated. The subsequent production is carried out according to the rolling program).

[0064] After each rolling, the profile is placed on the platform to measure the angle value of the profile (the gap between the hypotenuse and the angle template). Two points are selected for the first arc length, one point is selected for the second arc length, and two points are selected for the third arc length, for a total of five points. The angle measurement values ​​of the special-shaped frame are shown in Table 2.

[0065] Table 2 Numerical measurement table of special-shaped frame angles

[0066]

[0067] It can be seen from the table that the angle values ​​of the five points of each rolling are relatively uniform. The difference in the angle values ​​of the arc segments at both ends and the middle arc segments in the first five rollings is 0.3mm, which is within a reasonable range. After the last three rollings, the difference in the angle values ​​of the arc segments at both ends and the middle arc segments is 0 through fine-tuning. After eight rollings, the gap value between the angle and the sample is 0.3mm, which meets the technical index requirements. Since the angle is related to the flatness, the flatness is also uniform if the angle is uniform. After the eighth rolling, the gap between the bottom edge and the platform is 0.3mm, which meets the technical index requirements.

[0068] By adopting the segmented left and right rollers with staggered upper and lower spacing for rolling and bending, and the difference between the left and right rollers at the two end arcs is greater than the middle arc, and the left and right rollers are fine-tuned in each rolling process so that the difference is first large and then small, the angle and flatness of the rolled parts are uniform within the overall arc length, and the forming accuracy is high.

[0069] (3) Cutting allowance: Use a saw to remove the allowance at both ends of the part, with a total allowance of 1000 mm.

[0070] (4) Machining: Five drainage grooves with a width of 10 mm and a height of 2 mm are machined at the bottom of the small end of the part.

[0071] (5) Finishing: After machining, the internal stress of the parts is released, and one end is slightly warped, with a warping amount of 10 mm. No manual trimming is required after rolling. The internal stress is small, which is less than the warping amount of 23 mm caused by stretch bending. The smaller the warping amount, the lower the difficulty of trimming.

[0072] The present invention proposes to use a hydraulic press displacement mode to flatten parts in sections. The hydraulic press has two control modes, a force control mode and a displacement control mode. The displacement control mode is used to control the amount of downward pressure and flatten the warped parts in sections. The schematic diagram of the hydraulic press flattening is shown in FIG. Figure 7 shown.

[0073] As the profile is relatively long at 7854mm, multi-stage flattening and shaping is adopted. After many tests, the pressing amount is adjusted. As the warping amount of the end of the part is relatively high, the warping amount decreases towards the middle, and there is no warping within 1200mm from the end. Therefore, the pressing amount is gradually reduced in multiple stages. The process parameters of the pressing amount are shown in Table 3.

[0074] Table 3 Segmented downward pressure parameters

[0075]

[0076] The flattening is divided into six sections, and the arc length of each section is 300mm. The total arc length is about 1800mm, which exceeds the warping range of 1200mm. The pressure gradually decreases from the 1st section to the 5th section. The parameters of the 5th and 6th sections are the same. The 6th section mainly starts the pressure-maintaining function. The flattening is divided into four times in total, and the pressure gradually increases each time. The pressure in the first section is from 8mm to 10mm, which gradually reduces the warping. The flatness of the profile frame is successfully calibrated by gradually reducing the pressure in multiple sections. After calibration, the gap between the bottom edge and the platform is 0.5mm, which meets the technical index requirements.

[0077] Advantages of the present invention:

[0078] (1) The double-sided beveled special-shaped frame adopts the segmented staggered rolling forming method. After rolling, the parts have high precision, small internal stress concentration, and small head lift after machining. Combined with the segmented flattening method of hydraulic press displacement mode, the forming accuracy of the parts is greatly improved. After rolling, the radius clearance is 0.4mm, the angle clearance is 0.3mm, and the flatness clearance is 0.5mm, which is higher than the stretch bending forming accuracy. After manual trimming of stretch bending, the radius clearance is 1.5mm, the angle clearance is 1mm, and the flatness clearance is 1.5mm.

[0079] (2) The double-sided beveled special-shaped frame is formed by segmented staggered rolling and bending, which does not require manual trimming, greatly reducing the labor intensity of workers and improving production efficiency.

[0080] (3) After machining the double-sided beveled special-shaped frame, the hydraulic press displacement mode segmented flattening method is used, which effectively solves the problem of the head curling after the part machining, and improves the product qualification rate by 30%.

[0081] (4) The contact surface between the double-sided beveled special-shaped frame mold and the bottom edge of the profile is designed as a beveled large radius solution, which can effectively solve the profile rolling abrasive and improve the surface quality of the part. There is a gap between the upper and lower sides of the part and the mold to facilitate material extension.

[0082] 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 method for staggered rolling bending of double-sided beveled special-shaped frames of launch vehicles, characterized in that: The following steps are involved: S1. Cutting the profile frame parts; S2, performing segmented staggered roll-bending of the profile frame parts based on the roll-bending equipment; S3. Cutting allowance for profile frame parts: Use a saw to cut off the excess at both ends of the profile frame parts, and the total excess at both ends is 1000mm; S4. Machining of profile frame parts: The drainage notch at the bottom of the small end of the machined profile frame part has a width of 10mm and a height of 2mm; S5. Trimming of profile frame parts: After machining, the internal stress of the profile frame parts is released, and one end is slightly warped, with a warping amount of 10mm. The internal stress is less than the warping amount of 23mm during stretch bending. The hydraulic press displacement movement mode is used to flatten the profile frame parts in sections.

2. The staggered rolling forming process of a launch vehicle double-sided beveled special-shaped frame according to claim 1 is characterized in that: The rolling and bending equipment is a four-axis horizontal rolling and bending machine. The roller mold of the four-axis horizontal rolling and bending machine includes a center front roller, a center rear roller, a left roller, a right roller, a left pressure roller and a right pressure roller. The center front roller and the center rear roller are respectively installed to the front and back of the middle of the profile frame part, and the left roller, the right roller, the left pressure roller and the right pressure wheel are respectively installed to the left and right sides of the profile frame part.

3. The staggered rolling forming process of a launch vehicle double-sided beveled special-shaped frame according to claim 2, characterized in that: The straight edges and small fillet radii of the middle rear roller, the left roller and the right roller are changed to beveled large fillet radii, the fillet radius is changed from R2 to R6, the straight edges are changed to beveled edges, the beveled edge parameters are 0.5mm vertically and 20mm horizontally, and a gap of 1mm is left between the upper and lower sides of the profile frame parts and the roller mold to facilitate material extension.

4. The staggered rolling bending forming process of a launch vehicle double-sided beveled special-shaped frame according to claim 1 is characterized in that: In step S1, blanking the profile frame parts includes: For the profile frame parts, a sawing machine is used to cut the rough material with a length of 8854mm, and the length includes 7854mm part length and 1000mm margin.

5. The staggered rolling bending forming process of a launch vehicle double-sided beveled special-shaped frame according to claim 1 is characterized in that: In step S2, the profile frame parts are subjected to segmented staggered roll bending based on a roll bending device, including: Divide the arc length of the profile frame parts into sections, set staggered rolling bending process parameters for each section, and reduce the progressive torsion of the vertical edge angle; There are three technical indicators for the accuracy of profile frame parts after roll bending, namely, part radius deviation ≤1.5mm, gap between bevel and angle template ≤0.8mm, gap between bottom edge and platform ≤1.5mm. If these three indicators are met, the profile frame parts are qualified.

6. The staggered rolling forming process of the double-sided beveled special-shaped frame of a launch vehicle according to claim 5, characterized in that: The rolling process parameters include the number of rolling times, Y value, left Zn value and right Zn value. The Y value is used to adjust the radius size of the part, the left Zn value is the nth moving distance of the left roller, and the right Zn value is the nth moving distance of the right roller.

7. The staggered rolling forming process of the double-sided beveled special-shaped frame of a launch vehicle according to claim 6, characterized in that: The range of rolling times is 6-20 times.

8. The staggered rolling forming process of the double-sided beveled special-shaped frame of a launch vehicle according to claim 5, characterized in that: After each rolling and bending, the profile frame parts need to be placed on the platform to measure the angle values ​​of the profile frame parts.

9. The staggered rolling forming process of the double-sided beveled special-shaped frame of a launch vehicle according to claim 1, characterized in that: In step S5, the profile frame parts are flattened in sections using a hydraulic press displacement mode, including: The hydraulic press has two control modes, namely force control mode and displacement control mode. The displacement control mode is used to control the downward pressure and flatten the warped part in sections. As the profile frame is 7854mm long, it is flattened and shaped in multiple stages. As the end of the profile frame has a high amount of warping, the warping decreases towards the middle and there is no warping within 1200mm from the end. Therefore, the process parameters for the downward pressing amount are set in a way that the downward pressing amount is gradually reduced in multiple stages.

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