Fixtures and methods for local prestressing of ribs in double-convex ultra-wide ribbed panels

Abstract

This invention discloses a fixture and method for local prestressing and straightening of the ribs of a double-convex ultra-wide ribbed wall panel. The fixture includes an upper crossbeam, a lower crossbeam connected to it, and a pressure plate fixedly connected to the upper crossbeam. The wall panel is placed between the upper and lower crossbeams. A force-applying strut passes through one end of the pressure plate and connects to a force-applying pad at its bottom. The force-applying pad presses against a pre-bending point on the double-convex ultra-wide ribbed wall panel. An auxiliary strut passes through the other end of the pressure plate and connects to an auxiliary pad at its bottom. The auxiliary pad is in contact with the top of the rib where the pre-bending point is located and the top of the adjacent rib, supporting the upper crossbeam and the pressure plate. This method utilizes a separate design for the upper and lower crossbeams, adaptable to wall panels with different curvatures, and allows for adjustment of the clamping posture to accommodate different pre-bending point positions, thereby improving the applicability of the pre-bending and straightening fixture.

Description

Technical Field

[0001] This invention relates to the field of aircraft manufacturing technology, and further to a prestressed shot peening and straightening method for ultra-wide panels, specifically a tooling for local pre-bending of ribs and an ultrasonic shot peening and straightening method for a double-convex ultra-wide rib panel. Background Technology

[0002] With the development of the aviation industry, ultra-wide ribbed integral panels are widely used to improve the specific strength of aircraft and reduce weight. However, the curvature of these panels is extremely complex, making the prestressing clamping process on machine tools cumbersome and preventing the panels from achieving precise one-time forming of the overall curvature. Local shot peening is required to correct the curvature and meet the wing panel shape requirements. For ultra-wide ribbed panels, the large number of ribs and uneven curvature distribution mean that some ribs may experience drastic curvature changes during prestressing, making one-time shot peening unsatisfactory. This is especially true for ribbed panels with a double-convex shape, where rib deformation is more difficult than with a saddle shape, resulting in poorer forming quality.

[0003] In practical engineering, from an economic perspective, ultrasonic shot peening is generally used to locally correct the shape of ribbed wall panels. Since the deformation of the ribs in a double-convex ultra-wide ribbed wall panel requires greater energy, the correction must be performed under prestress. However, existing correction and pre-bending fixtures are suspended three-point structures, which can only apply prestress to the skin at the edge of the wall panel and cannot pre-bend the ribs. This means that ultrasonic shot peening of ultra-wide ribbed wall panels can only be performed in a free state, resulting in extremely limited correction energy. Consequently, the ribs cannot achieve the expected deformation, making it difficult for the wall panel shape to meet design requirements. Summary of the Invention

[0004] To address the problem of difficulty in locally pre-bending and straightening the ribs of a double-convex ultra-wide ribbed wall panel, this invention provides a fixture and method for locally prestressing and straightening the ribs of a double-convex ultra-wide ribbed wall panel. The technical solution is as follows:

[0005] A fixture for local prestressing and straightening of the ribs of a double-convex ultra-wide ribbed wall panel includes: an upper crossbeam with multiple mounting holes, the distance between which is the same as the rib spacing of the wall panel, and a protective layer between the upper crossbeam and the wall panel; a lower crossbeam fixedly connected to the upper crossbeam by lug structures at both ends; the wall panel placed between the upper and lower crossbeams, and a protective layer between the lower crossbeam and the wall panel; and a pressure plate with a force application hole on its center line. The system includes: an auxiliary hole, wherein the pressure plate is fixedly connected to the upper crossbeam via a connecting rod disposed between the force application hole and the auxiliary hole; a force application support rod, which passes through the force application hole and connects to a force application pad disposed at its bottom end, the force application pad pressing against the pre-bending point disposed on the double-convex ultra-wide rib wall plate; and an auxiliary support rod, which passes through the auxiliary hole and connects to an auxiliary pad disposed at its bottom end, the auxiliary pad fitting against the top of the rib where the pre-bending point is located and the rib on the adjacent side, for supporting the upper crossbeam and the pressure plate.

[0006] Preferably, the force-applying pad and the auxiliary pad have grooves that cooperate with the force-applying support rod and the auxiliary support rod, and a protective layer is provided on the contact surface between the force-applying pad and the double-convex ultra-wide ribbed wall panel.

[0007] Preferably, the protective layer is an elastic material.

[0008] Preferably, the force-applying support rod and the auxiliary support rod are threaded rod structures, and the force-applying hole and the auxiliary hole are threaded holes that mate with the threaded rod. The feed amount of the force-applying support rod and the auxiliary support rod can be adjusted by rotating the threads.

[0009] Preferably, one end of the connecting rod is connected to the pressure plate, and the other end is connected to the mounting hole on the upper crossbeam.

[0010] This application also provides a method for local prestressing and shaping of the ribs in a double-convex ultra-wide ribbed wall panel, the specific process of which is as follows:

[0011] Step 1: Determine the pre-bending point

[0012] The gap between the outer surface of the wall panel and the template is detected. The area where the gap exceeds the design requirements is the out-of-tolerance area of ​​the wall panel. The center lines of all the ribs in the out-of-tolerance area are marked on the outer surface of the wall panel as rib center lines. The direction of the ribs is set as the X direction, and the direction perpendicular to the ribs is set as the Y direction. A curvature meter is used to measure the curvature in the X direction along the rib center lines. The start and end points of the curvature deviation on the rib center lines are identified and marked as critical points. A correction zone is formed by extending 50-80mm along the Y direction on both sides of the rib center lines between the critical points. The center point of the rib center lines in the correction zone is marked as the pre-bending point.

[0013] Step 2: Install the upper and lower crossbeams.

[0014] Select a pre-bending point in the correction area, place the wall panel between the upper crossbeam and the lower crossbeam, with the ribs facing the upper crossbeam and the outer surface of the wall panel facing the lower crossbeam. Place the upper crossbeam along the Y direction on one side of the pre-bending point, connect the lower crossbeam to the upper crossbeam, and adjust their spacing so that the distance between the lower crossbeam and the outer surface of the wall panel is not less than 50mm.

[0015] Step 3: Install the pressure plate

[0016] Select the mounting hole on the upper crossbeam that is closest to the pre-bending point, and connect the pressure plate to the upper crossbeam movably via the connecting rod;

[0017] Step 4: Install the force-applying struts and force-applying pads.

[0018] Adjust the position of the pressure plate and the upper crossbeam so that the force application hole on the pressure plate is aligned with the pre-bending point on the rib. Install the force application support rod in the force application hole on the pressure plate. Connect the force application pad to the force application support rod. Adjust the feed amount of the force application support rod so that the bottom of the force application pad is in contact with the top of the rib and is not under force.

[0019] Step 5: Install auxiliary struts and auxiliary pads.

[0020] Keeping the position of the force application hole unchanged, adjust the position of the upper crossbeam so that the pressure plate is rotated until the auxiliary hole is aligned with the side of the rib where the pre-bending point is located. Install the auxiliary support rod in the auxiliary hole on the pressure plate, connect the auxiliary pad to the auxiliary support rod, and adjust the feed amount of the auxiliary support rod so that the auxiliary pad is in contact with the top of the rib where the pre-bending point is located and the adjacent side rib and is not under force.

[0021] Step 6: Adjust the spacing between the upper and lower crossbeams.

[0022] Adjust the distance between the upper crossbeam and the lower crossbeam so that the lower crossbeam contacts the outer surface of the wall panel at the pre-bending point and is not subjected to force;

[0023] Step 7: Fix the pressure plate

[0024] The pressure plate is fixedly connected to the upper crossbeam;

[0025] Step 8 Pre-bending

[0026] Adjust the feed amount of the force-applying strut to apply prestress to the top of the rib at the pre-bending point, causing the wall panel to bend and deform along the X direction. At the same time, use a curvature meter to measure the X-direction curvature on the outer surface of the wall panel until the pre-bending amount required for local rib straightening is met. When applying prestress, adjust the feed amount of the auxiliary strut to keep the pressure plate and the upper crossbeam parallel to the top of the rib.

[0027] Step 9: Ultrasonic shot peening

[0028] Ultrasonic shot peening is performed on the correction area on the outer surface of the wall panel;

[0029] Step 10: Inspect the shape

[0030] Remove the force-applying strut and the auxiliary strut. Use a shape gauge or curvature meter to test the X-direction curvature of the calibration area. If it meets the design requirements, the calibration is complete. If it does not meet the design requirements, repeat steps 8 and 9 until the design requirements are met.

[0031] Step 11: Release all parts of the alignment fixture from the pre-bending point and move them to the pre-bending point of the next alignment zone. Repeat steps 2-10 until the alignment of all pre-bending points is completed.

[0032] Preferably, when performing ultrasonic shot peening, a 3mm impact pin is used to correct the rib shape, with an amplitude not exceeding 95%, and the correction path is along the center line of the rib; a 2mm impact pin is used to correct the remaining areas, with an amplitude not exceeding 80%, and ultrasonic shot peening is performed along the X direction from the center line of the rib to both sides.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] (1) The ribs can be pre-bent and corrected in the horizontal posture of the wall panel, and the posture of the wall panel shape detection is consistent with that of the wall panel. There is no need to lift the wall panel twice, thereby improving the processing efficiency of parts.

[0035] (2) The separate design of the upper and lower crossbeams can be adapted to wall panels with different curvature shapes and can be adjusted at any time to suit different pre-bending point positions, thereby improving the applicability of the pre-bending and straightening fixture.

[0036] (3) The feed amount of the force-applying strut can be manually adjusted, which can adjust the prestress required for shaping in real time according to the actual shape of the wall panel and the shaping effect, thereby improving the flexibility of shaping.

[0037] (4) The auxiliary support rod can maintain the working posture of the prestressing shaping tool and ensure the stability of the force application at the pre-bending point when a large prestress is required. It is more suitable for shaping double convex ribs that require a large amount of pre-bending.

[0038] (5) It solves the problem of poor local rib forming effect in the double convex area of ​​ultra-wide ribbed wall panels, which makes it impossible to accurately pre-bend and correct the shape, thereby improving the conformity of the wall panel shape and thus improving product quality. Attached Figure Description

[0039] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0040] Figure 1 This is a schematic diagram of a pre-bending and straightening fixture structure for the double-convex ribs of an ultra-wide wall panel.

[0041] Figure 2 This is a schematic diagram of a local pre-bending and straightening method for the double-convex ribs of an ultra-wide panel.

[0042] Figure 3 yes Figure 2 I-I sectional view

[0043] Numbering in the diagram: 1 Upper crossbeam, 11 Mounting hole, 2 Lower crossbeam, 3 Pressure plate, 31 Force application hole, 32 Auxiliary hole, 33 Connecting rod, 4 Force application strut, 41 Force application pad, 5 Auxiliary strut, 51 Auxiliary pad, 6 Wall panel, 61 Rib, 62 Outer surface of wall panel, 7 Rib centerline, 8 Pre-bending point, 9 Shaping area Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] The purpose of this invention is to solve the problem of difficulty in local pre-bending and shaping of the ribs in double-convex ultra-wide ribbed wall panels in the prior art by providing a tooling and method for local prestressing and shaping of the ribs in double-convex ultra-wide ribbed wall panels.

[0046] Example 1

[0047] like Figure 1As shown in Figure 2, the fixture for local prestressing and straightening of the ribs in a double-convex ultra-wide ribbed wall panel includes:

[0048] The upper crossbeam 1 is made of steel and is a hollow square profile structure. The surface in contact with the wall panel 6 is covered with a polyurethane protective layer. The upper crossbeam 1 has 9 mounting holes 11, and the center-to-center distance between adjacent mounting holes 11 is 180mm, which is the same as the spacing of the ribs 61 on the wall panel 6. There is a lug at each end of the upper crossbeam 1, which is positioned towards the surface in contact with the wall panel 6. The lug has a U-shaped hole for connecting with the lower crossbeam 2.

[0049] The lower crossbeam 2 is made of steel and is a hollow square profile structure. Its length is the same as that of the upper crossbeam 1. The surface that contacts the wall panel 6 is covered with a polyurethane protective layer. There is a lug at each end of the lower crossbeam 2, which is positioned towards the surface that contacts the wall panel 6. The lug has a hole for connecting with the upper crossbeam 1.

[0050] Specifically, the upper crossbeam 1 and the lower crossbeam 2 are fixedly connected using bolts and nuts. During installation, based on the Y-direction curvature of the wall panel 6 and the position of the pre-bending point 8, the distance between the lugs at both ends of the lower crossbeam 2 and the lugs at both ends of the upper crossbeam 1 is adjusted while keeping the posture of the upper crossbeam 1 unchanged. The U-shaped holes in the lugs of the upper crossbeam 1 ensure that the bolts can be installed stably even when the distances are inconsistent.

[0051] A pressure plate 3 is made of steel. A force application hole 31 and an auxiliary hole 32 are provided on its center line. The force application hole 31 and the auxiliary hole 32 are threaded holes. The pressure plate 3 is fixedly connected to the upper crossbeam 1 through a connecting rod 33 set between the force application hole 31 and the auxiliary hole 32.

[0052] Specifically, the bottom of the connecting rod 33 has threads, which pass through the mounting hole 11 on the upper crossbeam 1 and engage with the nut for movable or fixed connection to the upper crossbeam 1.

[0053] A force-applying strut 4 is made of steel and has a threaded rod structure. The force-applying strut 4 is connected to the force-applying hole 31 through the thread, and the feed amount of the force-applying strut 4 can be adjusted by rotation. The bottom end of the force-applying strut 4 has a groove, which is connected to the force-applying pad 41 through the groove.

[0054] Specifically, the force-applying pad 41 is made of steel and is "H" shaped. It is connected to the force-applying strut 4 through the top slot and to the top of the rib 61 of the wall panel 6 through the bottom slot. A polyurethane protective layer is pasted on the contact surface between the force-applying pad 41 and the wall panel 6. Under prestressed shaping state, the force-applying pad 41 is pressed against the top of the rib 61 at the pre-bending point 8 of the wall panel 6.

[0055] An auxiliary support rod 5 is made of steel and has a threaded rod structure. The auxiliary support rod 5 is connected to the auxiliary hole 32 through threads, and the feed amount of the auxiliary support rod 5 can be adjusted by rotation. The bottom end of the auxiliary support rod 5 has a slot, which is connected to the auxiliary pad block 51 through the slot.

[0056] Specifically, the auxiliary pad 51 is made of aluminum alloy and is a semi-circular column with a slot inside that connects to the slot of the auxiliary support rod 5. The arc surface contacts the top of the rib 61 of the wall panel 6. In the prestressed shaping state, the auxiliary pad 51 fits the top of the rib 61 where the pre-bending point 8 of the wall panel 6 is located and the top of the rib 61 on one side, so as to maintain balance for supporting the upper beam 1 and the pressure plate 3.

[0057] The shaping fixture adopts an adjustable upper crossbeam 1, lower crossbeam 2 and pressure plate 3 connection structure. When in use, the feed amount of the force-applying strut 4 and auxiliary strut 5 is adjusted to apply prestress to the local ribs at the pre-bending point 8. Under the prestress state, the ribs are ultrasonically shaped to achieve local precise shaping of the ribs of the double convex ultra-wide ribbed wall panel.

[0058] like Figure 2 As shown in Figure 3, this application also provides a method for local prestressing correction of the stiffeners in a double-convex ultra-wide stiffener panel, the specific process of which is as follows:

[0059] Step 1: Determine the pre-bending point 8

[0060] The gap between the outer surface 62 of the wall panel and the template is checked. The area where the gap exceeds the design requirement by 0.5mm is the out-of-tolerance area of ​​the wall panel 6. The center line of the rib 61 in the out-of-tolerance area is marked on the outer surface 62 of the wall panel as the rib center line 7. The direction of the rib 61 is set as the X direction, and the direction perpendicular to the rib 61 is set as the Y direction. The curvature in the X direction is measured along the rib center line 7 using a curvature meter. The start and end points of the curvature deviation on the rib center line 7 are marked as critical points. The rib center line 7 between the critical points is extended 50mm to both sides along the Y direction to form the correction zone 9. The center point of the rib center line 7 in the correction zone 9 is marked as the pre-bending point 8.

[0061] Step 2: Install the upper crossbeam 1 and the lower crossbeam 2.

[0062] Select pre-bending point 8, place the wall panel 6 between the upper crossbeam 1 and the lower crossbeam 2, with the rib 61 facing the upper crossbeam 1 and the outer surface 62 of the wall panel facing the lower crossbeam 2. Place the upper crossbeam 1 along the Y direction on one side of the pre-bending point 8, and use bolts and nuts to connect the lower crossbeam 2 to the upper crossbeam 1 through the lug holes. The upper crossbeam 1 is placed on the rib 61 of the wall panel 6, and the distance between the lower crossbeam 2 and the outer surface 62 of the wall panel is not less than 50mm.

[0063] Step 3: Install pressure plate 3

[0064] Select the mounting hole 11 on the upper crossbeam 1 that is closest to the pre-bending point 8. The connecting rod 33 on the pressure plate 3 passes through the mounting hole 11. A nut is installed at the bottom but not tightened, so that the pressure plate 3 is movably connected to the upper crossbeam 1. The pressure plate 3 can rotate around the connecting rod 33 to adjust the position of the force application hole 31 and the auxiliary hole 32.

[0065] Step 4: Install the force-applying strut 4 and the force-applying pad 41

[0066] Move the position of the upper crossbeam 1 along the Y direction, and at the same time rotate the pressure plate 3 so that the force application hole 31 on the pressure plate 3 is aligned with the pre-bending point 8 on the rib 61. Install the force application support rod 4 in the force application hole 31 on the pressure plate 3, and install the force application pad 41 in the bottom slot of the force application support rod 4. Adjust the feed amount of the force application support rod 4 so that the bottom slot of the force application pad 41 is in contact with the top of the rib 61 and is not under force.

[0067] Step 5: Install auxiliary strut 5 and auxiliary pad 51

[0068] Keeping the position of the force application hole 31 unchanged, adjust the position of the upper crossbeam 1 so that the pressure plate 3 rotates until the auxiliary hole 32 is aligned with 80mm on one side of the rib 61 where the pre-bending point 8 is located. Install the auxiliary support rod 5 in the auxiliary hole 32 on the pressure plate 3, and install the auxiliary pad 51 in the slot at the bottom of the auxiliary support rod 5. Adjust the feed of the auxiliary support rod 5 so that the auxiliary pad 51 is in contact with the top of the rib 61 where the pre-bending point 8 is located and the adjacent rib 61 and is not under force.

[0069] Step 6: Adjust the spacing between the upper crossbeam 1 and the lower crossbeam 2.

[0070] By adjusting the bolt feed at both ends of the lower crossbeam 2, the distance between the lugs at both ends of the upper crossbeam 1 and the lower crossbeam 2 is adjusted so that the lower crossbeam 2 contacts the outer surface 62 of the wall panel at the pre-bending point 8 without being stressed. The pre-bending point 8 is closer to the right-end bolt, so during adjustment, the feed of the right-end bolt is increased first. After adjustment, the Y-direction tangent direction of the lower crossbeam 2 and the outer surface of the wall panel at the pre-bending point 8 are the same.

[0071] Step 7: Fix the pressure plate 3

[0072] Tighten the nut at the bottom of the connecting rod 33 on the pressure plate 3 to fix the pressure plate 3 to the upper crossbeam 1; Step 8: Pre-bending

[0073] Increase the feed amount of the force-applying strut 4 to apply prestress to the top of the rib 61 at the pre-bending point 8, so that the wall panel 6 bends and deforms along the X direction. At the same time, use a curvature meter to measure the curvature in the X direction on the outer surface 62 of the wall panel until the pre-bending amount required for the local correction of the rib 61 is met. When applying prestress, adjust the feed amount of the auxiliary strut 5 to keep the pressure plate 3 and the upper crossbeam 1 parallel to the top of the rib 61 at all times, so as to prevent the upper crossbeam 1 and the pressure plate 3 from tilting towards the auxiliary strut 5 during the force-applying pre-bending process.

[0074] Step 9: Ultrasonic shot peening

[0075] Ultrasonic shot peening is performed on the shaping area 9 of the outer surface 62 of the wall panel. Preferably, when performing ultrasonic shot peening, a 3mm awl is used to shape the rib 61, with an amplitude not exceeding 95%, and the shaping path is along the center line 7 of the rib. A 2mm awl is used to shape the remaining areas, with an amplitude not exceeding 80%, and ultrasonic shot peening is performed along the X direction from the center line 7 of the rib to both sides.

[0076] Step 10: Inspect the shape

[0077] Remove the force-applying strut 4 and auxiliary strut 5, unload the prestress applied with the wall panel 6, and use a shape gauge or curvature meter to test the X-direction curvature of the correction area 9. If it meets the design requirements, the correction is complete. If it does not meet the design requirements, repeat steps 8 and 9 until the design requirements are met.

[0078] In this embodiment, there is only one pre-bending point. For cases with multiple pre-bending points, proceed to step 11:

[0079] Step 11: Release all parts of the alignment fixture from the pre-bending point and move them to the pre-bending point of the next alignment zone. Repeat steps 2-10 until the alignment of all pre-bending points is completed.

[0080] This application utilizes a separate design for the upper and lower crossbeams, allowing it to adapt to wall panels with different curvatures and shapes. The clamping posture can be adjusted at any time to accommodate different pre-bending point positions, thus improving the applicability of the pre-bending and straightening fixture. By manually adjusting the feed amount of the force-applying bolts, the required prestress can be adjusted in real time according to the actual shape of the wall panel and the desired straightening effect, thereby increasing the flexibility of the straightening process. The auxiliary support rods maintain the working posture of the prestressing and straightening fixture, ensuring the stability of the force applied to the pre-bending point when a larger prestress is required. This is particularly suitable for straightening ribs with double-convex shapes that require a large pre-bending amount. This application solves the problem of poor local rib forming effect in the double-convex area of ​​ultra-wide ribbed wall panels, which makes precise pre-bending and straightening impossible, improving the conformity of the wall panel shape and thus enhancing product quality.

[0081] This specification uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method for local prestressing and shaping of the ribs in a double-convex ultra-wide ribbed panel, characterized in that... A calibration fixture is used for calibration, the calibration fixture including... An upper crossbeam has multiple mounting holes, the distance between the mounting holes is the same as the spacing between the ribs of the wall panel, and a protective layer is provided between the upper crossbeam and the wall panel. A lower crossbeam is provided, which is fixedly connected to the upper crossbeam by lug structures at both ends; a wall panel is placed between the upper crossbeam and the lower crossbeam, and a protective layer is provided between the lower crossbeam and the wall panel; A pressure plate, wherein a force application hole and an auxiliary hole are provided on the center line of the pressure plate, and the pressure plate is fixedly connected to the upper crossbeam by a connecting rod provided between the force application hole and the auxiliary hole; A force-applying strut passes through the force-applying hole and connects to a force-applying pad at its bottom end, the force-applying pad pressing against a pre-bending point on the double-convex ultra-wide ribbed wall panel; and An auxiliary support rod passes through the auxiliary hole and connects to an auxiliary pad at its bottom end. The auxiliary pad is in contact with the top of the rib where the pre-bending point is located and the rib on the adjacent side to support the upper crossbeam and the pressure plate. The specific process of the calibration method is as follows: Step 1: Determine the pre-bending point The gap between the outer surface of the wall panel and the template is detected. The area where the gap exceeds the design requirements is the out-of-tolerance area of ​​the wall panel. The center lines of all the ribs in the out-of-tolerance area are marked on the outer surface of the wall panel as rib center lines. The direction of the ribs is set as the X direction, and the direction perpendicular to the ribs is set as the Y direction. A curvature meter is used to measure the curvature in the X direction along the rib center lines. The start and end points of the curvature deviation on the rib center lines are identified and marked as critical points. A correction zone is formed by extending 50-80mm along the Y direction on both sides of the rib center lines between the critical points. The center point of the rib center lines in the correction zone is marked as the pre-bending point. Step 2: Install the upper and lower crossbeams. Select a pre-bending point in the correction area, place the wall panel between the upper crossbeam and the lower crossbeam, with the ribs facing the upper crossbeam and the outer surface of the wall panel facing the lower crossbeam. Place the upper crossbeam along the Y direction on one side of the pre-bending point, connect the lower crossbeam to the upper crossbeam, and adjust their spacing so that the distance between the lower crossbeam and the outer surface of the wall panel is not less than 50mm. Step 3 Install the pressure plate Select the mounting hole on the upper crossbeam that is closest to the pre-bending point, and connect the pressure plate to the upper crossbeam movably via the connecting rod; Step 4: Install the force-applying struts and force-applying pads. Adjust the position of the pressure plate and the upper crossbeam so that the force application hole on the pressure plate is aligned with the pre-bending point on the rib. Install the force application support rod in the force application hole on the pressure plate. Connect the force application pad to the force application support rod. Adjust the feed amount of the force application support rod so that the bottom of the force application pad is in contact with the top of the rib and is not under force. Step 5: Install auxiliary struts and auxiliary pads. Keeping the position of the force application hole unchanged, adjust the position of the upper crossbeam so that the pressure plate is rotated until the auxiliary hole is aligned with the side of the rib where the pre-bending point is located. Install the auxiliary support rod in the auxiliary hole on the pressure plate, connect the auxiliary pad to the auxiliary support rod, and adjust the feed amount of the auxiliary support rod so that the auxiliary pad is in contact with the top of the rib where the pre-bending point is located and the adjacent side rib and is not under force. Step 6: Adjust the spacing between the upper and lower crossbeams. Adjust the distance between the upper crossbeam and the lower crossbeam so that the lower crossbeam contacts the outer surface of the wall panel at the pre-bending point and is not subjected to force; Step 7: Fix the pressure plate The pressure plate is fixedly connected to the upper crossbeam; Step 8 Pre-bending Adjust the feed amount of the force-applying strut to apply prestress to the top of the rib at the pre-bending point, causing the wall panel to bend and deform along the X direction. At the same time, use a curvature meter to measure the X-direction curvature on the outer surface of the wall panel until the pre-bending amount required for local rib straightening is met. When applying prestress, adjust the feed amount of the auxiliary strut to keep the pressure plate and the upper crossbeam parallel to the top of the rib. Step 9: Ultrasonic shot peening Ultrasonic shot peening is performed on the correction area on the outer surface of the wall panel; Step 10: Inspect the shape Remove the force-applying strut and the auxiliary strut, and use a shape gauge or curvature meter to test the X-direction curvature of the correction area. If it meets the design requirements, the correction is complete. If it does not meet the design requirements, repeat steps 8 and 9 until the design requirements are met. Step 11: Release all parts of the alignment fixture from the pre-bending point and move them to the pre-bending point of the next alignment zone. Repeat steps 2-10 until the alignment of all pre-bending points is completed.

2. The method for local prestressing and shaping of the ribs in the double-convex ultra-wide ribbed wall panel according to claim 1, characterized in that... When performing ultrasonic shot peening, a 3mm impact pin is used to correct the shape of the ribs, with an amplitude not exceeding 95%, and the correction path is along the center line of the ribs; a 2mm impact pin is used to correct the shape of the remaining areas, with an amplitude not exceeding 80%, and ultrasonic shot peening is performed along the X direction from the center line of the ribs to both sides.

3. The method for local prestressing and shaping of the ribs in the double-convex ultra-wide ribbed wall panel according to claim 1, characterized in that... The force-applying pad and the auxiliary pad have slots that cooperate with the force-applying support rod and the auxiliary support rod, and a protective layer is provided on the contact surface between the force-applying pad and the double-convex ultra-wide ribbed wall panel.

4. The method for local prestressing and shaping of the ribs in the double-convex ultra-wide ribbed wall panel according to claim 1, characterized in that... The protective layer is made of an elastic material.

5. The method for local prestressing and shaping of the ribs in the double-convex ultra-wide ribbed wall panel according to claim 1, characterized in that... The force-applying support rod and the auxiliary support rod are threaded rod structures. The force-applying hole and the auxiliary hole are threaded holes that mate with the threaded rod. The feed amount of the force-applying support rod and the auxiliary support rod can be adjusted by rotating the threads.

6. The method for local prestressing and shaping of the ribs in the double-convex ultra-wide ribbed wall panel according to claim 1, characterized in that... One end of the connecting rod is connected to the pressure plate, and the other end is connected to the mounting hole on the upper crossbeam.

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