Method for forming super-long weak-rigidity grid wallboard

Abstract

The invention provides a super-long weak-rigidity grid wall plate forming method. The super-long weak-rigidity grid wall plate forming method comprises the following steps that S1, manufacturability structure compensation is conducted on a welding area of a super-long weak-rigidity grid wall plate; s2, mechanically milling a grid area of the wallboard; s3, the wall plate is subjected to roll bending forming; and S4, the straightness of the wallboard is corrected and trimmed. According to the forming method for the ultra-long weak-rigidity grid wall plate, through reasonable arrangement of forming procedures, design of a product profile precision regulation and control tool and optimization of a forming manufacturability compensation structure, production process parameters can be solidified, the size precision requirement is met, and the assembly welding requirement is met.

Description

Technical Field

[0001] The invention belongs to the technical field of launch vehicle barrel segment wall panels, and in particular relates to a method for forming an ultra-long weak-rigidity grid wall panel. Background Art

[0002] The new generation of medium launch vehicle tube section wall plate heading height reaches 6000mm, such as Figure 1 As shown in the figure, the total thickness of the wall panel is 10mm, the thickness of the welding area is 6mm, and the thickness of the skin area is 2mm. The skin area accounts for a large proportion and the thickness of the ribs is small, and the overall rigidity of the part is weak. This type of wall panel brings great challenges to the existing bending forming technology, mainly manifested in: ① The deflection deformation of the wall panel under the action of gravity increases significantly; ② The difficulty of releasing internal stress during the forming process increases, and the straightness deviation of the wall panel is large; ③ The heading curvature radius of the wall panel after forming is large, and the surface consistency is poor. It is extremely difficult to control the dimensional accuracy of the wall panel, and the surface accuracy of the product after forming directly affects the subsequent assembly accuracy. The skin area accounts for a large proportion and the thickness of the ribs is small, and the overall rigidity of the part is weak. Due to the significant increase in the heading height of the wall panel and the structural characteristics of the grid area, the force is uneven during the forming process, so that the curvature radius of each part of the formed part is poorly consistent, and generally presents a "waisted shape", that is, the curvature radius of the upper and lower ends of the heading is large, and the curvature radius of the middle part is small. Therefore, the straightness deviation of the welding areas on the left and right sides is also large, and the overall dimensional accuracy of the product is seriously out of tolerance, and the risk of scrapping is high.

[0003] For super-long tube section wall panels, gate pressure forming, roll forming, creep forming and drawing forming are usually used at home and abroad.

[0004] (1) Gate forming: A large CNC bending machine drives the punch to apply radial pressure on the wall panel surface to achieve local three-point bending deformation, then move the wall panel for the next gate pressure, and finally form the entire wall panel to the required curvature. The basic principle is to rely on the accumulation of deformations to produce overall deformation. For cylinder wall panels with small thickness, weak rigidity, and small radius of curvature, it is easy to form obvious creases on the product surface during the forming process, and the risk of product damage is very high, and the production efficiency is low. (2) Roll forming: During the forming process, the upper surface of the side roller is higher than the upper surface of the lower roller to apply external stress to the wall panel, and three-point bending forming occurs between the side roller and the upper and lower rollers. Due to the large heading height of the wall panel, the deflection deformation is obvious during the forming process, and the dimensional accuracy of the parts is low. (3) Creep forming: A forming method that uses the creep characteristics of metal to simultaneously perform forming and aging. It is suitable for the forming and correction of small curvature shell parts. Ultra-long cylinder wall panels require special forming equipment, and the process is more difficult to implement. (4) Drawing forming: The rough material is passed around the drawing die, and the ends are clamped with two rows of clamps. The drawing die is then raised (or the clamp is moved down), so that the rough material is bent and deformed along the arc line with the drawing die. With the action of the oil cylinder, the rough material gradually stretches and deforms, and finally sticks to the mold. For wall panels with uneven wall thickness, drawing can easily cause excessive deformation and thinning of the thin skin, and even cracking of the root of the grid ribs. This process is not suitable for the forming of wall panels with grids. Summary of the invention

[0005] In view of this, the present invention aims to propose a method for forming an ultra-long weak rigid grid wall panel, so as to provide an ultra-long weak rigid grid wall panel forming method that can solidify production process parameters, meet dimensional accuracy requirements, and meet assembly and welding needs.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A method for forming an ultra-long weak rigid grid wall panel comprises the following steps:

[0008] S1. Perform process structural compensation on the wall panels;

[0009] S2, mechanical milling of the wall panel grid area;

[0010] S3, rolling and bending the wall panel;

[0011] S4. Adjust the straightness of the wall panels.

[0012] Furthermore, the specific method for performing process structure compensation on the wallboard in step S1 is:

[0013] S11. Set margin areas outside the welding areas at the upper and lower ends of the part respectively;

[0014] S12. Install circumferential ribs in the margin area;

[0015] S13. After the circumferential ribs are successfully welded, remove the excess area.

[0016] Furthermore, the margin area is a circular ring structure, the thickness of the margin area is the same as the thickness of the welding area, the thickness of the annular ribs is consistent with the thickness of the triangular mesh area, and auxiliary rolling forming is performed.

[0017] Furthermore, the heading height of the margin area is 4-6 times the rib width of the grid area.

[0018] Furthermore, the specific method of rolling the wall panel in step S3 is:

[0019] S31. Finishing: wipe off the excess material on the roller and wallboard surface of the plate rolling machine before rolling;

[0020] S32, loading: align the wall panels in the center using the side rollers;

[0021] S33, Rolling: The wall panels are rolled and formed by four-axis rolling;

[0022] S34, unloading: the lower roller and side roller of the plate rolling machine are reset to take out the wall panel.

[0023] Furthermore, the wall panel rolling forming is carried out in multiple passes, and the adjustment amount of the distance between the side roller and the upper roller in each pass is 10mm, 5mm and 2mm. After each rolling passing, the height of each auxiliary roller is adjusted according to the difference in curvature during the forming process. The principle is that the height of the roller corresponding to the point where the curvature radius of the wall panel is larger is increased, and the height of the roller corresponding to the point where the curvature radius of the wall panel is smaller is reduced accordingly. The height of the roller is adjusted by 0.2mm each time until the curvature radius of each point is consistent.

[0024] Furthermore, the specific method for correcting the straightness of the wallboard in step S4 is:

[0025] S41, regulating the welding area around the wall panel by adjusting the tooling;

[0026] S42. Correct the shape of the welding area.

[0027] Furthermore, the regulating tooling includes a top block, a cushion block, a stand and a cylinder. A placement groove for placing the wall panel is provided in the middle of the stand. The bottom of the placement groove is installed with a cushion block, and the top of the cylinder is installed. The top block is fixedly installed below the cylinder, and the top block is located directly below the cushion block. The wall panel is placed between the top block and the cushion block. During the shaping process, top blocks and cushion blocks are respectively placed on the upper and lower surfaces of the wall panel to form support points, and the top block is driven by the cylinder to cause the wall panel to deform.

[0028] Furthermore, the control tooling is used to perform progressive straightness correction on the out-of-tolerance area, and the feed amount of the top block is controlled in the range of 310 to 315 mm until the maximum busbar straightness deviation is ≤2 mm.

[0029] Compared with the prior art, the ultra-long weak rigid grid wall panel forming method of the present invention has the following advantages:

[0030] (1) The ultra-long weak rigid grid wall panel forming method described in the present invention can solidify the production process parameters, meet the dimensional accuracy requirements, and meet the assembly and welding needs by reasonably arranging the forming process, designing the product surface precision control tooling, and optimizing the forming process compensation structure.

[0031] (2) The method for forming the ultra-long weak rigid grid wall panel described in the present invention uses a regulating tool to calibrate the wall panel, which is easy to operate and can effectively meet the precision requirements of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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:

[0033] Figure 1 A schematic diagram of the background technology of the present invention;

[0034] Figure 2 It is a flow chart of the method for forming an ultra-long weak rigid grid wall panel according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of a process compensation structure according to an embodiment of the present invention;

[0036] Figure 4 A schematic diagram of roll bending according to an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of arc point measurement according to an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of roller height compensation according to an embodiment of the present invention;

[0039] Figure 7 for Figure 6 Schematic diagram of the A direction;

[0040] Figure 8 Schematic diagram of the measurement of the straightness of the generatrix of the wallboard according to the embodiment of the present invention Figure 1 ;

[0041] Fig. 9 A schematic diagram of a super-wall plate straightness control tooling according to an embodiment of the present invention;

[0042] Fig.10 Schematic diagram of the measurement of the straightness of the generatrix of the wallboard according to the embodiment of the present invention Figure 2 .

[0043] Description of reference numerals:

[0044] 1-welding area; 2-grid; 3-rib; 4-allowance area; 5-top block; 6-pad; 7-stand; 8-cylinder; 9-straight line ruler; A-wall panel. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0049] A method for forming an ultra-long weak rigid grid wall panel, such as Figures 2 to 10 As shown, the following steps are included:

[0050] S1. Perform process structural compensation on the wall panels;

[0051] S2, mechanical milling of wall panel grid area 2;

[0052] S3, rolling and bending the wall panel;

[0053] S4. Adjust the straightness of the wall panels.

[0054] The specific method for performing process structure compensation on the wall panel in step S1 is:

[0055] S11, setting a margin area 4 outside the welding area at the upper and lower ends of the part respectively;

[0056] S12, installing annular ribs 3 in the margin areas 4 above and below the wall panel heading, the annular ribs 3 play a deformation support role, and improve the consistency of the bending radius of the wall panel after forming;

[0057] Preferably, the heading margin height of the upper and lower ends of the wall panel is as small as possible when annular ribs can be set, the thickness and width of the annular ribs 3 are consistent with the thickness of the triangular grid area 2, and the heading height of the margin area 4 is preferably 4-6 times the width of the triangular grid ribs.

[0058] S13, welding the annular ribs 3 in the margin area 4; to avoid the influence of the annular ribs 3 on the wall panel welding area 1, after the annular ribs 3 are successfully welded, the margin area 4 is removed, preferably by milling.

[0059] In one or more embodiments, the parameters of the wall panel to be processed are: the total thickness of the wall panel is 10mm, the thickness of the welding area is 6mm, and the thickness of the skin area is 2mm. The skin area accounts for a large proportion and the rib thickness is small, and the overall rigidity of the part is weak. Considering the requirements of the wall panel welding for the upper and lower end margin areas 4, the upper and lower ends of the wall panel forming processability compensation structures are all based on Figure 3 The structure shown is milled, and the allowance area 4 is a circular ring structure. The height of the allowance area 4 is 60 mm, and the thickness of the allowance area 4 (i.e., the thickness of the circular ring) is the same as the thickness of the welding area 2. The axial height of the annular rib 3 is 25 mm, and the thickness of the annular rib 3 is consistent with the thickness of the triangular mesh area 2, and auxiliary rolling forming is performed.

[0060] The specific method of rolling the wallboard in step S3 is:

[0061] S31, finishing:

[0062] Use a bean bag cloth to wipe off the excess material on the roller and the wall panel surface of the plate rolling machine before rolling.

[0063] S32, loading:

[0064] Use the side rollers to center and align the siding;

[0065] S33, Rolling Bending:

[0066] The four-axis rolling method is adopted. To avoid the rollers scratching the product surface, the gap between the upper and lower rollers of the plate rolling machine is slightly larger than the thickness of the wall plate. Preferably, the gap is 13mm.

[0067] In this embodiment, if Figures 4 to 7 As shown, the wall panel rolling forming is carried out in multiple passes. The adjustment amount of the distance between the side roller and the upper roller in each pass is 10mm, 5mm and 2mm. After each rolling, press Figure 4 The arc radius is measured at the points shown. According to the difference in arc during the forming process, the height of each auxiliary roller is adjusted. The principle is to increase the height of the roller corresponding to the point where the arc radius of the wall panel is larger, and reduce the height of the roller corresponding to the point where the arc radius of the wall panel is smaller. The height of the roller is adjusted by 0.2mm each time until the arc radius of each point is consistent. The specific arc radius of each point and the corresponding situation of the roller and the roller height compensation parameters are shown in Table 1.

[0068] Table 1 Correspondence between the arc radius at each point and the roller

[0069]

[0070] Continue to adjust the downward pressure until the product curvature radius meets the index requirements;

[0071] S34, unloading:

[0072] The lower roller and side rollers of the plate rolling machine are reset to take out the wall panel.

[0073] The specific method for correcting the straightness of the wallboard in step S4 is:

[0074] S41, Use the surface precision control tool to control the welding area around the wall panel

[0075] In this embodiment, the schematic diagram of measuring the maximum straightness deviation of the wall panel is as follows: Figure 7 As shown, by adding a forming process compensation structure, the "waisted" feature of the wall panel is significantly alleviated, and the maximum straightness deviation is reduced from about 20mm to about 10mm, but it still cannot meet the design requirement of 6mm. A straightness control tooling is designed based on this feature.

[0076] The shaping area of ​​the control tooling is the welding area around the wall panel. The shaping principle is to achieve local three-point bending deformation by applying radial pressure. For specific implementation, please refer to Figure 8 The regulating tooling includes a top block 5, a cushion block 6, a stand 7 and a cylinder 8. A placement groove for placing the wall panel is provided in the middle of the stand 7. The cushion block 6 is installed at the bottom of the placement groove, and the cylinder 8 is installed at the top. The top block 5 is fixedly installed below the cylinder 8, and the top block 5 is located directly below the cushion block 6. The wall panel is placed between the top block 5 and the cushion block 6. During the shape correction process, the top block 5 and the cushion block 6 are respectively placed on the upper and lower surfaces of the wall panel to form support points, and the top block 5 is driven by the hydraulic cylinder 8 to cause the wall panel to deform.

[0077] S42, Correction of welding area

[0078] In this embodiment, Fig. 9 The method shown in the figure measures the maximum straightness deviation L of the wall panel after roll bending, and uses the straightness control tool to perform progressive correction and trimming on the out-of-tolerance area. During the correction process, the feed amount of the top block 5 is 310-320 mm. After the initial correction, the maximum straightness deviation L is reduced from 10 mm to 3-4 mm, and the out-of-tolerance area of ​​the straightness deviation L is significantly reduced. Fig.10 Further correction is made to the out-of-tolerance area, and the feed amount of the top block 5 is controlled in the range of 310-315 mm until the maximum generatrix straightness deviation is ≤2 mm.

[0079] Move to other areas for correction according to the deviation until the product accuracy meets the index requirements.

[0080] 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 forming an ultra-long weak rigid grid wall panel, characterized in that: The steps include: S1. Perform process structural compensation on the wall panels; S2, mechanical milling of the wall panel grid area; S3, rolling and bending the wall panel; S4. Adjust the straightness of the wall panels.

2. The method for forming an ultra-long weak rigid grid wall panel according to claim 1, characterized in that: The specific method for performing process structure compensation on the wall panel in step S1 is: S11. Set margin areas outside the welding areas at the upper and lower ends of the part respectively; S12. Install circumferential ribs in the margin area; S13. After the circumferential ribs are successfully welded, remove the excess area.

3. The method for forming an ultra-long weak rigid grid wall panel according to claim 2, characterized in that: The allowance area is a circular ring structure, the thickness of the allowance area is the same as that of the welding area, the thickness of the annular ribs is consistent with that of the triangular mesh area, and auxiliary rolling forming is performed.

4. The method for forming an ultra-long weak rigid grid wall panel according to claim 2, characterized in that: The heading height of the margin area is 4-6 times the rib width of the grid area.

5. The method for forming an ultra-long weak rigid grid wall panel according to claim 1, characterized in that: The specific method of rolling the wallboard in step S3 is: S31. Finishing: wipe off the excess material on the roller and wallboard surface of the plate rolling machine before rolling; S32, loading: align the wall panels in the center using the side rollers; S33, Rolling: The wall panels are rolled and formed by four-axis rolling; S34, unloading: the lower roller and side roller of the plate rolling machine are reset to take out the wall panel.

6. The method for forming an ultra-long weak rigid grid wall panel according to claim 5, characterized in that: The wall panel rolling forming is carried out in multiple passes, and the adjustment amount of the distance between the side roller and the upper roller in each pass is 10mm, 5mm and 2mm. After each rolling bending, the height of each auxiliary roller is adjusted according to the difference in curvature during the forming process. The principle is to increase the height of the roller corresponding to the point where the curvature radius of the wall panel is larger, and reduce the height of the roller corresponding to the point where the curvature radius of the wall panel is smaller. The height of the roller is adjusted by 0.2mm each time until the curvature radius of each point is consistent.

7. The method for forming an ultra-long weak rigid grid wall panel according to claim 1, characterized in that: The specific method for correcting the straightness of the wallboard in step S4 is: S41, regulating the welding area around the wall panel by adjusting the tooling; S42. Correct the shape of the welding area.

8. The method for forming an ultra-long weak rigid grid wall panel according to claim 7, characterized in that: The regulating tooling includes a top block, a cushion block, a stand and a cylinder. A placement slot for placing wall panels is provided in the middle of the stand. The bottom of the placement slot is installed with a cushion block, and the top of the cylinder is installed with a cylinder. The top block is fixedly installed below the cylinder, and the top block is located directly below the cushion block. The wall panel is placed between the top block and the cushion block. During the shape correction process, top blocks and cushion blocks are respectively placed on the upper and lower surfaces of the wall panel to form support points, and the top block is driven by the cylinder to cause the wall panel to deform.

9. The method for forming an ultra-long weak rigid grid wall panel according to claim 8, characterized in that: Use control tooling to perform progressive straightness correction on the out-of-tolerance area, and control the feed amount of the top block in the range of 310-315mm until the maximum busbar straightness deviation is ≤2mm.

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