Method for controlling deformation of a complex girth thin-walled pipe plate welding structure

Abstract

A method for controlling deformation of a complex thin-walled pipe plate welding structure, comprising: using an inner tire consistent with the inner arc surface of a product as a main structure; processing a groove consistent with the product fluid pipe on the outer surface of the inner tire, and processing the mounting point hole of the product on the inner tire; performing bending forming of the product conduit on the groove of the inner tire to ensure uniform gap between the product conduit and the groove; after the conduit is completely installed to the groove of the inner tire, determining the actual need for installation of the skin according to the actual situation, processing after the skin is determined, and using a symmetric partition welding method for the skin; after welding is completed, calibrating the skin on the inner tire, and processing the mounting hole after leveling. The method can achieve the purpose of controlling deformation of a complex thin-walled pipe plate welding structure, uses an integrated inner tire to control the assembly accuracy of the fluid pipe, ensures the assembly gap by laser cutting the skin according to the actual position of the fin, and effectively achieves the purpose of controlling structure deformation by using a partition symmetric welding method.

Description

Technical Field

[0001] This invention relates to a method for controlling the deformation of welded structures of thin-walled tube sheets with complex orientations, and relates to the field of mechanical engineering. Background Technology

[0002] In large spacecraft structures, there exists a type of large, thin-walled, weakly rigid thermal control product. This type of product is mainly composed of finned ducts and thin plates welded together. The finned ducts are generally quite long and require segmented welding to connect them into a single long tube. The overall product has a cylindrical or conical structure. The ducts, acting as the product's skeleton, are inherently weak due to their large size. Thin-walled skins are welded to the fins of the ducts, and the product connects to the cabin by machining mounting holes in the skin. The manufacturing process of this type of product presents the following challenges: 1) The product essentially surrounds the entire spacecraft, is very large (with a maximum diameter exceeding 2 meters), and has weak rigidity, making welding and assembly difficult; 2) The thin skins result in significant deformation during welding; 3) Due to the large size of the product, improper control of the welding sequence during assembly can lead to deformation of the entire product, making it difficult to control the mounting point location for connection to the cabin. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and solve the problem of deformation in large thin-walled tube sheet welded structures.

[0004] The objective of this invention is achieved through the following technical solutions:

[0005] A method for controlling deformation of welded thin-walled tube sheet structures with complex orientations includes:

[0006] The inner tube, which is consistent with the inner arc surface of the product, is used as the main structure.

[0007] The inner tube is machined with grooves that match the product's fluid tubes on its outer surface, and the mounting holes for the product are machined on the inner tube.

[0008] The product guide tube is bent and shaped in the inner tube groove to ensure that the gap between the product guide tube and the groove is uniform. After all the guide tubes are installed in the inner tube groove, the actual need for the skin is determined according to the actual situation. After the skin is determined, it is processed. The skin adopts a symmetrical partition welding method.

[0009] After welding is completed, the skin is shaped and leveled on the inner tube, and then the mounting holes are machined.

[0010] Preferably, a three-dimensional visual scanning method is used to determine the actual skin that needs to be installed.

[0011] Preferably, the skin that needs to be welded between the product duct fins is determined by visual scanning. The scanning results are output as an actual three-dimensional model, and the actual required skin shape is cut by flattening operation.

[0012] Preferably, when the product conduit is assembled and placed into the channel, a thin sheet is attached to the inner wall of the channel to ensure the center deviation of the product conduit body.

[0013] Preferably, the actual skin needs to be installed based on the actual situation, and after the skin is determined, it is processed by laser cutting.

[0014] Preferably, after the outer skin is placed into the inner tube, it is pressed down section by section.

[0015] Preferably, based on the orientation of the skin and the inner tube, a clamping method is used for welds perpendicular to the axis of the barrel, and a pressure plate method is used for welds parallel to the axis.

[0016] Preferably, a cold metal transfer welding method is used to reduce heat input during the welding process and minimize welding deformation. Preferably, after welding is completed and before removal from the die, the mounting holes are machined using a die as a drill jig.

[0017] This ensures the overall positional accuracy of the mounting holes in large, thin-walled structural products.

[0018] Preferably, after welding is completed, the skin is shaped and leveled on the inner tube, and then mounting holes are machined by enlarging the holes.

[0019] Compared with the prior art, the present invention has the following beneficial effects: The method of the present invention can achieve the purpose of deformation control of welded structures of thin-walled tube sheets with complex orientations. It uses an integrated inner tube to control the assembly accuracy of the fluid tube orientation, and laser-cuts the skin according to the actual position of the fins to ensure assembly gaps. It also employs a partitioned symmetrical welding method to effectively control structural deformation. Furthermore, it uses a jig as a drilling template to ensure the overall positional accuracy of the mounting holes in large thin-walled structural products. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a one-piece inner tube.

[0021] Figure 2 This is a map showing the skin partitions. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0023] This invention proposes a method for controlling the deformation of welded thin-walled tube sheet structures with complex orientations. This method can solve the deformation problem of large thin-walled tube sheet welded structures and can be used for accurate machining, which is of great significance for improving the precision of such products and meeting application requirements. It includes:

[0024] The inner tube, which is consistent with the inner arc surface of the product, is used as the main structure.

[0025] The inner tube is machined with grooves that match the product's fluid tubes on its outer surface, and the mounting holes for the product are machined on the inner tube.

[0026] The product guide tube is bent and shaped in the inner tube groove to ensure that the gap between the product guide tube and the groove is uniform. After all the guide tubes are installed in the inner tube groove, the actual need for the skin is determined according to the actual situation. After the skin is determined, it is processed. The skin adopts a symmetrical partition welding method.

[0027] After welding is completed, the skin is shaped and leveled on the inner tube, and then the mounting holes are machined.

[0028] Example:

[0029] This invention discloses a method for controlling the deformation of welded thin-walled tube sheet structures with complex orientations. By using an integrated inner tube and tooling with segmented external pressure, the welding is completed symmetrically in segments. Cold metal transfer welding is used to reduce the heat input during the welding process, ensuring that the shape remains consistent with the inner tube throughout the manufacturing process, thereby reducing the deformation of the thin-walled structure. This method has a significant advantage in reducing the deformation of welded thin-walled tube sheet structures.

[0030] The specific technical solution is as follows:

[0031] The main structure uses an integrated inner tube 1 that matches the inner arc surface of the product, such as... Figure 1 As shown, grooves consistent with the fluid pipes are machined on the outer surface of the inner tube, and the mounting holes of the product are machined on the inner tube. The product guide tubes are bent and shaped on the grooves of the inner tube to ensure uniform gap with the tooling grooves. After all the guide tubes are installed into the inner tube grooves, the actual skin to be installed is determined by three-dimensional vision scanning according to the actual situation. After the skin is determined, it is processed by laser cutting. The skin adopts a symmetrical partition welding method to prevent excessive welding deformation at the final welding part. After welding is completed, the skin is shaped and leveled on the inner tube. After leveling, the mounting holes are machined by enlarging the holes.

[0032] The method mainly includes an inner tube that integrates bending, assembly, welding, shaping, and drilling to control deformation, as well as a method for controlling the deformation of thin-walled tube sheet welded structures.

[0033] Overall shape preservation method:

[0034] The fluid pipe routing, clearance holes, and product mounting points are first machined onto a 40mm thick steel plate. The fluid pipe routing is machined to a depth of 16mm and a width of 17mm to ensure that the fluid pipe can be placed into the channel and is easy to remove. The mounting holes are machined as through holes, and the clearance holes are machined to a depth of 5mm to facilitate the precise machining of clearance holes on the inner tube. Then, the flat plate is rolled and bent to the theoretical diameter of the product.

[0035] One-time assembly and disassembly:

[0036] Meanwhile, since the base and pressure plate are consistent with the final state of the product, the secondary molding after the product is removed from the mold is reduced, and the precision of the product is improved.

[0037] Fluid tube assembly:

[0038] When assembling the fluid pipe and placing it into the clearance channel, attach a 0.8mm thin sheet to the inner wall of the channel to ensure the center deviation of the fluid pipe body.

[0039] After the fluid pipe is welded, it is placed into the inner tube's groove to ensure that the center of the pipe body basically coincides with the theoretical center.

[0040] After the fluid tube skeleton is welded and placed into the inner tube, a visual scan is used to scan the actual three-dimensional orientation of the fluid tube to determine the actual skin contour.

[0041] Visual scanning was used to partition and determine the areas of the fluid tube fins that required welding, such as... Figure 2 As shown, the scan results are output as an actual 3D model, and the actual skin shape is cut out by flattening.

[0042] 3D laser cutting of skin:

[0043] Based on the skin contour obtained by visual scanning, laser cutting is performed to ensure the assembly accuracy of the skin and fluid tube, reduce assembly deformation, and ensure the consistency of assembly gaps.

[0044] Place the segmented, cut skin onto the surface of the inner tube.

[0045] After the outer skin is inserted into the inner tube, it is pressed in section by section:

[0046] Based on the orientation of the skin and inner tube, a clamping method is used for welds perpendicular to the axis of the barrel, while a pressure plate method is used for welds parallel to the axis.

[0047] Partial welding is employed to further reduce welding deformation:

[0048] After the compression is completed, the entire radiator is welded using a symmetrical partition welding method.

[0049] Cold metal transfer welding method is used:

[0050] The cold metal transition welding method is used to reduce heat input during the welding process and reduce welding deformation.

[0051] Using a jig as a drilling template, machine mounting holes:

[0052] After the product is welded and before it is removed from the mold, the mounting holes are machined using a jig as a drilling mold, thereby ensuring the overall positional accuracy of the mounting holes for large thin-walled structural products.

[0053] The workflow is as follows:

[0054] Integrated inner tube machining and bending;

[0055] After the fluid tube is bent into sections on the plane, it is shaped on the inner tube to ensure good adhesion to the tire.

[0056] After the fluid pipe is welded as a whole, prevent it from touching the inner tube and use visual scanning to determine the actual skin size;

[0057] Laser-cut skin ensures proper assembly clearance;

[0058] The clamping device 3 is used to tighten the clamp;

[0059] Reduce welding deformation by using symmetrical, zoned welding methods;

[0060] After welding is completed, the inner tube is shaped, and then the mounting holes for the product are machined through the mounting holes on the inner tube.

[0061] The contents not described in detail in this specification are common knowledge to those skilled in the art.

[0062] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A method for controlling the deformation of welded thin-walled tube sheet structures with complex orientations, characterized in that, include: The inner tube, which is consistent with the inner arc surface of the product, is used as the main structure. The inner tube is machined with grooves that match the product's fluid tubes on its outer surface, and the mounting holes for the product are machined on the inner tube. The product guide tube is bent and shaped in the inner tube groove to ensure that the gap between the product guide tube and the groove is uniform. After all the guide tubes are installed in the inner tube groove, the actual need for the skin is determined according to the actual situation. After the skin is determined, it is processed. The skin adopts a symmetrical partition welding method. After welding is completed, the skin is shaped and leveled on the inner tube, and then the mounting holes are machined. The actual skin to be installed is determined by using 3D visual scanning. The visual scanning method is used to determine the skin that needs to be welded between the product's duct fins. The scanning results are output as an actual 3D model. The actual skin shape is cut by flattening operation. When assembling the product conduit and placing it into the channel, a thin sheet is attached to the inner wall of the channel to ensure that the center deviation of the product conduit body is maintained.

2. The method according to claim 1, characterized in that, The actual need for skin installation is determined based on the specific circumstances, and then laser cutting is used for processing after the skin is determined.

3. The method according to claim 1, characterized in that, After the outer skin is inserted into the inner tube, it is pressed down section by section.

4. The method according to claim 3, characterized in that, Based on the orientation of the skin and inner tube, a clamping method is used for welds perpendicular to the axis of the barrel, while a pressure plate method is used for welds parallel to the axis.

5. The method according to claim 1, characterized in that, The cold metal transition welding method is used to reduce heat input during the welding process and reduce welding deformation.

6. The method according to claim 1, characterized in that, After the product is welded and before it is removed from the mold, the mounting holes are machined using a jig as a drilling mold, thereby ensuring the overall positional accuracy of the mounting holes for large thin-walled structural products.

7. The method according to any one of claims 1 to 6, characterized in that, After welding is completed, the skin is shaped and leveled on the inner tube. Then, mounting holes are machined by enlarging the holes.

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