A spaceflight F-shaped section frame part forming stress roll bending correction method and device

Abstract

The application relates to the field of aerospace manufacturing technology and discloses a forming stress roll bending correction method and device for an F-shaped profile frame part for aerospace. The method is characterized in that a vertical correction roller correction device is installed on parallel support frames on both sides of a numerical control three-axis profile roll bending machine, an F-shaped profile frame part is placed at a detection platform detection bottom plate upwarp gap position, the part is rolled into the roll bending machine, and the vertical correction roller is in rolling contact with the annular rib plate; when there is a gap on the arc-shaped outer side of the bottom plate, the parallel support frames are lowered; and when there is a gap on the arc-shaped inner side of the bottom plate, the parallel support frames are raised, so that a vertical correction force is applied to the annular rib plate and overall roll bending correction is carried out. The scheme can correct the bottom plate upwarp and the verticality deviation of the vertical plate, and improves the correction efficiency and forming quality of the F-shaped profile frame part.

Description

Technical Field

[0001] This invention relates to the field of aerospace manufacturing technology, specifically to a method and apparatus for correcting the forming stress of F-shaped profile frame parts for aerospace applications by rolling. Background Technology

[0002] In aerospace structural component manufacturing, profile frame parts, as important radial load-bearing components of the rocket body, have their forming accuracy directly affecting the final product's assembly quality. With the application of new structural designs, F-shaped cross-section profile frames are gradually being adopted. These parts are typically formed using tension bending or roll bending processes.

[0003] However, since the F-shaped profile is an arc-shaped double-ribbed structure, during the roll bending process, the material feed of the upper and lower annular ribs and the ribbed and unribbed parts of the vertical plate is uneven, which can easily cause stress deformation problems such as large gaps at the root of the bottom plate and excessive verticality of the vertical plate.

[0004] Existing calibration methods mainly rely on manual correction or traditional triaxial parallel rolling calibration. The former is labor-intensive, inefficient, and difficult to guarantee quality, while the latter can only correct the curvature but cannot eliminate cross-sectional distortion, resulting in a high product scrap rate and severely restricting the development cycle and production cost. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art. In view of the problem that it is difficult to efficiently correct the warping of the bottom plate and the twisting deformation of the upright plate after the F-shaped profile frame parts are rolled and formed, the present invention provides a rolling stress correction method and device for F-shaped profile frame parts for aerospace applications, so as to achieve accurate elimination of forming stress and rapid restoration of cross-sectional geometric accuracy.

[0006] To achieve the above objectives, the present invention employs the following technical solutions: A method for correcting forming stress during roll bending of F-shaped profile frame parts for aerospace applications includes the following steps: S1. A vertical correction roller shaping device is installed on the parallel support frames on both sides of the CNC three-axis profile bending machine; the vertical correction roller shaping device includes a rotatable vertical roller. S2. Place the F-shaped profile frame part on the testing platform and test the warping gap position of the bottom plate of the F-shaped profile frame part relative to the testing platform and the verticality of the upright plate. S3. Roll one end of the F-shaped profile frame part into the CNC three-axis profile bending machine so that the vertical roller contacts the annular rib surface of the F-shaped profile frame part. S4. Based on the gap position detected in S2, adjust the height of the parallel support frame. When there is a gap on the outer side of the arc of the base plate, lower the parallel support frame; when there is a gap on the inner side of the arc of the base plate, raise the parallel support frame so as to apply a vertical correction force to the annular stiffener through the vertical roller. S5. Start the CNC three-axis profile roll bending machine to perform overall roll bending and shaping on the F-shaped profile frame part. After completing one overall roll bending and shaping, take the F-shaped profile frame part out to the inspection platform for re-inspection. If the gap between the bottom plate and the verticality of the upright plate do not meet the technical requirements, repeat S4 to S5.

[0007] Preferably, S2 specifically includes: placing the F-shaped profile frame part on the detection platform, and using a square and detection pad to detect the gap and verticality.

[0008] Preferably, the height of the parallel support frame is raised or lowered by 1~3mm in a single operation; After adjustment, the CNC three-axis profile roll bending machine is turned on to complete one overall shape correction. The F-shaped profile frame part is then taken out to the detection platform for gap and perpendicularity detection. If the test fails, continue to adjust the height of the parallel support frame and repeat the above operation until the gap and verticality meet the preset technical requirements.

[0009] Preferably, S3 specifically includes: making the vertical correction roller fully contact the upper surface of the annular rib plate of the F-shaped profile frame part, so as to control the annular rib plate to be subjected to downward or upward force, and to maintain parallel and compressive action without twisting.

[0010] In addition, the present invention also provides a forming stress roll bending correction device for aerospace F-shaped profile frame parts, including a CNC three-axis profile roll bending machine, wherein parallel support frames are provided on both sides of the CNC three-axis profile roll bending machine; the parallel support frames are provided with smooth rod support rods, and a lifting adjustment structure is connected to the bottom of the parallel support frames; The support rod is equipped with a vertical correction roller shaping device, which includes a vertical roller, a bearing, and a limiting pad. The vertical roller has a through hole machined in the middle, and the bearing is installed in the through hole with an interference fit; the vertical roller is rotatably sleeved on the smooth rod support rod via the bearing; The limiting pad is sleeved on the optical rod support rod and located on the axial side of the vertical roller, used to restrict the vertical roller from moving axially along the optical rod support rod; The lifting and adjusting structure drives the parallel support frame and the vertical roller to rise and fall as a whole, so that the vertical roller rises and falls relative to the annular stiffener of the F-shaped profile frame part and applies a vertical correction force to the annular stiffener.

[0011] Preferably, the limiting pad is an annular tubular structure, the inner diameter of the limiting pad is 0.20~0.30mm larger than the outer diameter of the light rod support rod, and the wall thickness of the limiting pad is 8~10mm.

[0012] Preferably, the parallel support frame is a square frame structure, and two freely rotatable cylindrical support rods are installed on the top and bottom of the frame; The vertical roller is mounted on the upper-middle end of the light rod support rod via the limiting pad.

[0013] Preferably, the bottom of the parallel support frame is provided with a hydraulic lifting structure or a mechanical lifting device, which is used to drive the parallel support frame and the vertical correction roller alignment device to lift as a whole.

[0014] The present invention has the following advantages: (1) The present invention adds a vertical correction roller shaping device to the parallel support frame on both sides of the CNC three-axis profile rolling bending machine, and combines the lifting and lowering adjustment of the parallel support frame to make the vertical roller apply a controllable vertical correction force to the annular rib plate of the F-shaped profile frame part during the rolling bending process, thereby correcting the bottom plate warping and verticality deviation of the upright plate caused by forming stress, reducing the influence of manual hammering on the surface of the part, and improving the shaping efficiency and forming quality.

[0015] (2) Compared with traditional manual correction or simple parallel rolling correction, the correction method of the present invention reduces the manual correction time of the product base plate flatness from 6 to 8 hours to more than 30 minutes, and increases production efficiency by nearly 15 times, significantly improving production efficiency.

[0016] (3) The calibration device of the present invention avoids surface damage caused by local hammering, and ensures product consistency and pass rate.

[0017] (4) The shaping method of the present invention is universal and applicable to all profile roll forming processes. It can be extended to other similar profile roll forming processes by simply adapting the corresponding roller structure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the F-shaped profile frame component structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the deformation state of the F-shaped profile frame part according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a CNC three-axis profile roll bending machine according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation structure of the vertical correction roller shaping device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the gap detection on the outer arc of the base plate according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the gap detection on the inner side of the arc-shaped base plate according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the hydraulic lifting structure of the roll bending correction device according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the vertical roller and bearing assembly structure according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the limiting pad structure according to an embodiment of the present invention.

[0019] Among them, 1-vertical roller, 2-bearing, 3-limiting pad, 4-parallel support frame, 5-smooth support rod. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] Example 1 like Figures 1 to 9 As shown, this embodiment provides a method and device for correcting forming stress in F-shaped profile frame parts for aerospace applications by rolling. By integrating a dedicated vertical correction roller forming device on a CNC three-axis profile rolling machine, the forming stress of the F-shaped profile frame parts can be efficiently eliminated and the geometric accuracy restored.

[0023] like Figure 3 and Figure 7 As shown, a forming stress roll bending correction device for aerospace F-shaped profile frame parts includes a CNC three-axis profile roll bending machine with parallel support frames on both sides. The parallel support frames have a lifting adjustment structure, which can be a hydraulic lifting structure or a mechanical lifting device. This hydraulic or mechanical lifting structure is used to drive the parallel support frames and the vertical correction roller shaping device to rise and fall as a whole. In practical applications, existing CNC three-axis profile roll bending machines generally have a built-in hydraulic lifting system, which can be used directly to drive the parallel support frames to rise and fall. If the equipment does not have this system, a mechanical lifting device such as a screw and nut pair can be added to achieve height adjustment. A vertical correction roller shaping device is installed on the parallel support frames. This vertical correction roller shaping device contacts the annular stiffener of the F-shaped profile frame part and applies a vertical correction force to the annular stiffener through the lifting adjustment structure when the parallel support frames rise and fall.

[0024] Furthermore, such as Figure 4 , Figure 8 and Figure 9 As shown, the vertical alignment roller device includes a vertical roller 1, a bearing 2, a limiting pad 3, and a parallel support frame 4. The parallel support frame 4 is a rectangular frame structure, with two cylindrical support rods 5 mounted at its top and bottom. The vertical roller 1 is mounted on the upper support rod 5 via the limiting pad 3. A through hole is machined in the middle of the vertical roller 1, and the bearing 2 is installed in the through hole with an interference fit, ensuring that the vertical roller 1 can rotate freely relative to the support rod 5. The limiting pad 3 is fitted onto the support rod 5 of the frame 4, and the vertical roller 1 is mounted on the support rod 5 via the limiting pad 3. The limiting pad 3 is an annular tubular structure, with an inner diameter 0.20~0.30mm larger than the outer diameter of the support rod 5, and a wall thickness of 8~10mm, used to prevent the vertical roller 1 from moving left and right on the support rod 5. A 0.20~0.30mm clearance is reserved between the inner hole and the smooth rod support rod 5. This ensures smooth assembly and avoids installation difficulties or jamming due to excessive tightness. It also effectively restricts the axial freedom of the vertical roller 1 and prevents it from moving left and right when subjected to lateral correction force, thus affecting the accuracy of force application.

[0025] This embodiment also provides a method for correcting the forming stress of F-shaped profile frame parts for aerospace applications by roll bending. This method is based on the above-mentioned correction device, and the specific operation steps are as follows: Step S100: Install vertical correction rollers on the parallel support frames on both sides of the CNC three-axis profile bending machine. Specifically, the assembled vertical correction roller shaping device is securely installed on the parallel support frames on both sides of the bending machine, and the vertical rollers 1 are adjusted to a suitable position within the frame 4 using the limiting pads 3 to ensure that the positions of the vertical rollers 1 on both sides are symmetrical and their heights are consistent.

[0026] Step S200: Place the F-shaped profile frame part on the inspection platform and check the gap position of the base plate of the F-shaped profile frame part. Specifically, place the F-shaped profile frame part on the inspection platform and use a square and inspection pads to check the gap and perpendicularity. Figure 5 and Figure 6 As shown, there are usually two typical deformation states during the test: one is that there is a gap on the outer side of the arc of the base plate, in which case there is a gap between the upper end of the square and the upright plate; the other is that there is a gap on the inner side of the arc of the base plate, in which case there is a gap between the lower end of the square and the upright plate.

[0027] Step S300: Roll one end of the F-shaped profile frame part into the CNC three-axis profile bending machine, so that the vertical straightening roller contacts the annular rib plate of the F-shaped profile frame part. Ensure full contact between the vertical straightening roller and the upper surface of the annular rib plate of the F-shaped profile frame part to control the downward or upward force on the annular rib plate, maintaining parallelism and compression without torsion. By directly applying the vertical roller 1 to the upper surface of the annular rib plate, the straightening force is confined to the vertical plane, causing the rib plate to bear compressive or tensile stress, thereby eliminating the original deformation.

[0028] Step S400: Adjust the height of the parallel support frame according to the gap position of the base plate, so as to apply a vertical correction force to the annular stiffener through the vertical correction roller. Specifically, when the gap position of the base plate is on the outer side of the arc of the base plate, adjust the height of the parallel support frame downward; when the gap position of the base plate is on the inner side of the arc of the base plate, adjust the height of the parallel support frame upward.

[0029] Step S500: Start the CNC three-axis profile roll bending machine to perform overall roll bending and shaping of the F-shaped profile frame part. To ensure the safety and controllability of the correction process, adjust the height of the parallel support frame by 1~3mm in a single adjustment; after adjustment, start the CNC three-axis profile roll bending machine to complete one overall shaping, remove the F-shaped profile frame part and place it on the inspection platform for gap and perpendicularity testing; if the test fails, continue to adjust the height of the parallel support frame and repeat the above operation until the gap and perpendicularity meet the preset technical requirements. Limit the single adjustment amount to the range of 1~3mm.

[0030] This invention addresses the technical challenge of uneven material feeding in F-shaped profile frame parts, which are characterized by an arc-shaped double-ribbed structure and prone to twisting deformation during roll bending due to uneven material feeding in the upper and lower annular ribs and vertical plates. It overcomes the limitation of traditional three-axis roll bending machines, which can only perform parallel roll correction. By adding vertical correction rollers to the parallel support frames on both sides and combining this with the overall lifting and lowering adjustment of the support frames, a coordinated correction mechanism is constructed, linking lateral and vertical force application with overall lifting and lowering. During the roll bending process, the vertical correction roller 1 applies precise and controllable vertical pressure to the annular ribs. Combined with the dynamic changes in the height of the support frames, this causes directional contraction or extension of the material structure in the upper and lower annular ribs and vertical plates of the profile cross-section, fundamentally eliminating residual stress and twisting deformation caused by uneven material feeding. Compared to traditional manual correction or simple parallel roll correction, this method not only significantly improves production efficiency but also avoids surface damage caused by localized hammering due to the uniform and controllable correction force, effectively ensuring product consistency and pass rate.

[0031] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A method for correcting forming stress by roll bending of F-shaped profile frame parts for aerospace applications, characterized in that, Includes the following steps: S1. A vertical correction roller shaping device is installed on the parallel support frames on both sides of the CNC three-axis profile bending machine; the vertical correction roller shaping device includes a rotatable vertical roller. S2. Place the F-shaped profile frame part on the testing platform and test the warping gap position of the bottom plate of the F-shaped profile frame part relative to the testing platform and the verticality of the upright plate. S3. Roll one end of the F-shaped profile frame part into the CNC three-axis profile bending machine so that the vertical roller contacts the annular rib surface of the F-shaped profile frame part. S4. Based on the gap position detected in S2, adjust the height of the parallel support frame. When there is a gap on the outer side of the arc of the base plate, lower the parallel support frame; when there is a gap on the inner side of the arc of the base plate, raise the parallel support frame so as to apply a vertical correction force to the annular stiffener through the vertical roller. S5. Start the CNC three-axis profile roll bending machine to perform overall roll bending and shaping on the F-shaped profile frame part. After completing one overall roll bending and shaping, take the F-shaped profile frame part out to the inspection platform for re-inspection. If the gap between the bottom plate and the verticality of the upright plate do not meet the technical requirements, repeat S4 to S5.

2. The method for correcting forming stress by roll bending of aerospace F-shaped profile frame parts according to claim 1, characterized in that, S2 specifically includes: Place the F-shaped profile frame part on the inspection platform, and use a square and inspection pad to check the gap and verticality.

3. The method for correcting forming stress by roll bending of aerospace F-shaped profile frame parts according to claim 1, characterized in that, The height of the parallel support frame can be raised or lowered by 1~3mm in a single operation. After adjustment, the CNC three-axis profile roll bending machine is turned on to complete one overall shape correction. The F-shaped profile frame part is then taken out to the detection platform for gap and perpendicularity detection. If the test fails, continue to adjust the height of the parallel support frame and repeat the above operation until the gap and verticality meet the preset technical requirements.

4. The method for correcting forming stress by roll bending of aerospace F-shaped profile frame parts according to claim 1, characterized in that, S3 specifically includes: The vertical correction roller is brought into full contact with the upper surface of the annular rib plate of the F-shaped profile frame part to control the annular rib plate to be subjected to downward or upward force, and to maintain parallel and compressive action without twisting.

5. A device for correcting forming stress by rolling bending of F-shaped profile frame parts for aerospace applications, characterized in that, The invention includes a CNC three-axis profile bending machine, wherein parallel support frames are provided on both sides of the CNC three-axis profile bending machine; the parallel support frames are provided with smooth support rods, and a lifting and adjusting structure is connected to the bottom of the parallel support frames; The support rod is equipped with a vertical correction roller shaping device, which includes a vertical roller, a bearing, and a limiting pad. The vertical roller has a through hole machined in the middle, and the bearing is installed in the through hole with an interference fit; the vertical roller is rotatably sleeved on the smooth rod support rod via the bearing; The limiting pad is sleeved on the optical rod support rod and located on the axial side of the vertical roller, used to restrict the vertical roller from moving axially along the optical rod support rod; The lifting and adjusting structure drives the parallel support frame and the vertical roller to rise and fall as a whole, so that the vertical roller rises and falls relative to the annular stiffener of the F-shaped profile frame part and applies a vertical correction force to the annular stiffener.

6. The aerospace F-shaped profile frame part forming stress roll bending correction device according to claim 5, characterized in that, The limiting pad is an annular tubular structure. The inner diameter of the limiting pad is 0.20~0.30mm larger than the outer diameter of the optical rod support rod, and the wall thickness of the limiting pad is 8~10mm.

7. The aerospace F-shaped profile frame part forming stress roll bending correction device according to claim 5, characterized in that, The parallel support frame is a square frame structure, and two freely rotatable cylindrical support rods are installed on the top and bottom of the frame. The vertical roller is mounted on the upper-middle end of the light rod support rod via the limiting pad.

8. The aerospace F-shaped profile frame part forming stress roll bending correction device according to claim 7, characterized in that, The bottom of the parallel support frame is equipped with a hydraulic lifting structure or a mechanical lifting device, which is used to drive the parallel support frame and the vertical correction roller straightening device to lift as a whole.

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