Large cylinder thin-wall part and partition design method thereof

Abstract

The application provides a large-scale cylindrical thin-wall part and a partition design method thereof, and belongs to the technical field of aircraft structure design, and comprises the following steps: preliminarily partitioning a large-scale cylindrical thin-wall part according to the least number of part partitions based on the manufacturing space limitation of an additive manufacturing device; identifying the structural features and manufacturing requirements of each partition of the large-scale cylindrical thin-wall part, and selecting an additive manufacturing process for each partition according to the structural features and manufacturing requirements of each partition; determining the performance reduction value of the welding interface of each partition of the large-scale cylindrical thin-wall part, and performing strength checking on the welding interface based on the actual load condition of the large-scale cylindrical thin-wall part and the performance reduction value of the welding interface; if the strength checking of the welding interface does not meet the design requirements, adjusting the partition of the large-scale cylindrical thin-wall part, and repeating the above steps and rechecking the strength of the welding interface; and if the strength checking of the welding interface meets the design requirements, obtaining a partition design scheme of the large-scale cylindrical thin-wall part based on the combined process of additive manufacturing and welding.

Description

Technical Field

[0001] This application belongs to the field of aircraft structural design technology, and specifically relates to a large cylindrical thin-walled part and its partition design method. Background Technology

[0002] Cylindrical thin-walled parts are typical components in aircraft structures and have wide applications, such as air intake structures and nozzle structures. These parts typically have complex internal surfaces and large dimensions. They are usually formed in sections using sheet metal processing, and then assembled by welding or mechanical connections. However, this forming method requires the pre-fabrication of sheet metal molds. Furthermore, due to the limitations of sheet metal forming processes, the cylindrical part usually needs to be disassembled into dozens of independent parts before assembly, resulting in long forming times and significant welding deformation. Summary of the Invention

[0003] The purpose of this application is to provide a large cylindrical thin-walled part and its partition design method to solve or alleviate at least one of the problems in the prior art.

[0004] The technical solution of this application is: a partitioned design method for large cylindrical thin-walled parts, including:

[0005] Step S1: Based on the manufacturing space limitations of the additive manufacturing equipment, perform preliminary partitioning of the large cylindrical thin-walled parts according to the minimum number of parts partitions;

[0006] Step S2: Identify the structural features and manufacturing requirements of each section of the large cylindrical thin-walled part, and select the additive manufacturing process for each section based on the structural features and manufacturing requirements of each section of the large cylindrical thin-walled part.

[0007] Step S3: Determine the performance reduction value of each zone of the welding interface of the large cylindrical thin-walled part, and perform strength verification of the welding interface based on the actual load of the large cylindrical thin-walled part and the performance reduction value of the welding interface.

[0008] Step S4: If the strength check of the welding interface does not meet the design requirements, adjust the partitioning of the large cylindrical thin-walled part, and repeat steps S2 to S3 and recheck the strength of the welding interface; if the strength check of the welding interface meets the design requirements, a partitioning design scheme for the large cylindrical thin-walled part based on additive manufacturing and welding combination process is obtained.

[0009] In a preferred embodiment of the present invention, the identified structural features and manufacturing requirements include:

[0010] 1) Identify surface features, i.e., whether there are irregular or complex surfaces within the initial partition of a large cylindrical thin-walled part;

[0011] 2) Identify the layout of reinforcing ribs, that is, whether there are irregular reinforcing rib layouts within the initial partition of large cylindrical thin-walled parts;

[0012] 3) Identification accuracy requirements, i.e., whether there are areas requiring high-precision manufacturing within the initial partitioning of large cylindrical thin-walled parts.

[0013] In a preferred embodiment of the present invention, if there are irregular complex surfaces, irregular reinforcing rib layouts, or areas requiring high precision manufacturing within the partition of a large cylindrical thin-walled part, a powder spreading molding process is adopted; otherwise, a powder feeding molding process is adopted.

[0014] In a preferred embodiment of the present invention, the method for calculating the performance reduction of the welding interfaces of each section of the large cylindrical thin-walled part is as follows:

[0015]

[0016] In the formula: σ is the working normal stress of the weld; σ b S represents the tensile strength of the base material of the weldment; b K is the failure normal stress of the weld; K1 is the strength weakening coefficient of the weld; τ is the working shear stress of the weld; τ f K is the breaking shear stress of the weld; K2 is the tensile-shear coefficient of the weld.

[0017] In a preferred embodiment of the present invention, the method for adjusting the partitions of the large cylindrical thin-walled part is as follows:

[0018] 1) Adjust the partition interface towards the low-load area based on the actual load conditions of the large cylindrical thin-walled parts;

[0019] 2) The dimensions of each section of the adjusted large cylindrical thin-walled part shall not exceed the space limitations of the additive manufacturing equipment;

[0020] 3) The interfaces of each section of the adjusted large cylindrical thin-walled part should, as far as possible, divide similar structural features into the same area.

[0021] On the other hand, the present invention provides a large cylindrical thin-walled part, which is obtained by adopting any of the large cylindrical thin-walled part partition design methods described above.

[0022] The method for partitioning large cylindrical thin-walled parts provided by this invention is based on additive manufacturing and welding combination process to realize partitioning design and processing of large cylindrical thin-walled parts. Compared with the traditional sheet metal forming combination process, the manufacturing of large cylindrical thin-walled parts using this method has the advantages of high manufacturing efficiency and small part deformation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0024] Figure 1 This is a schematic diagram of the partition design method for large cylindrical thin-walled parts according to the present invention.

[0025] Figure 2 This is a schematic diagram of a large cylindrical thin-walled part according to an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the partitioning of a large cylindrical thin-walled part according to an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of the partitioning of a traditional large cylindrical thin-walled part. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0029] To address the issues of long forming time and large deformation in sheet metal forming and welding processes for large cylindrical thin-walled parts, this invention provides a partitioned design method for large cylindrical thin-walled parts. This method uses additive manufacturing and welding processes to replace the traditional sheet metal assembly process, thereby improving the manufacturing efficiency of large cylindrical thin-walled parts.

[0030] like Figure 1 As shown, the partitioning design method for large cylindrical thin-walled parts provided by the present invention includes the following steps:

[0031] Step S1: Based on the manufacturing space limitations of the additive manufacturing equipment, perform preliminary partitioning of the large cylindrical thin-walled parts according to the minimum number of parts partitions.

[0032] like Figure 2 The diagram shown is a schematic representation of the structure of a large cylindrical thin-walled part in this embodiment of the invention. The total length of the large cylindrical thin-walled part is 2100mm, and the space of the additive manufacturing equipment used for the large cylindrical thin-walled part is 800mm×800mm×1000mm. Therefore, in this embodiment, the large cylindrical thin-walled part is initially divided into three regions, namely region 1 to region 3, as shown below. Figure 3 As shown.

[0033] Step S2: Identify the structural features and manufacturing requirements of each section of the large cylindrical thin-walled part, and select the additive manufacturing process for each section based on the structural features and manufacturing requirements of each section of the large cylindrical thin-walled part.

[0034] In this invention, the identified structural features and manufacturing requirements include:

[0035] 1) Identify surface features, i.e., whether there are irregular or complex surfaces within the initial partition of a large cylindrical thin-walled part;

[0036] 2) Identify the layout of reinforcing ribs, that is, whether there are irregular reinforcing rib layouts within the initial partition of large cylindrical thin-walled parts;

[0037] 3) Identification accuracy requirements, i.e., whether there are areas requiring high-precision manufacturing within the initial partitioning of large cylindrical thin-walled parts.

[0038] For example in Figure 3 In the embodiment shown, irregular complex surfaces and irregular reinforcing ribs are identified in the first and second regions.

[0039] If there are irregular or complex shapes, irregular reinforcing ribs, or areas requiring high-precision manufacturing within the part's partition, then powder spreading molding process is used; otherwise, powder feeding molding process is used.

[0040] For example, in this embodiment of the present invention, based on the structural feature identification results of the first to third regions, the first and second regions have irregular complex surfaces and irregular reinforcing rib layouts, so they are formed by powder spreading process, while the third region is formed by powder feeding process.

[0041] Step S3: Determine the performance reduction value of each zone of the welding interface of the large cylindrical thin-walled part, and perform strength verification of the welding interface based on the actual load of the large cylindrical thin-walled part and the performance reduction value of the welding interface.

[0042] In this invention, the performance of the welding interfaces of each zone of a large cylindrical thin-walled part is reduced according to the following formula:

[0043]

[0044] In the formula: σ is the working normal stress of the weld; σ b S represents the tensile strength of the base material of the weldment; b K is the failure normal stress of the weld; K1 is the strength weakening coefficient of the weld; τ is the working shear stress of the weld; τ f K1 represents the failure shear stress of the weld; K2 represents the tensile-shear coefficient of the weld. Coefficients K1 and K2 are determined experimentally, ultimately determining the allowable stress reduction value at the weld interface.

[0045] Step S4: If the strength check of the welding interface does not meet the design requirements, adjust the partitioning of the large cylindrical thin-walled part, and repeat steps S2 to S3 above and recheck the strength of the welding interface; if the strength check of the welding interface meets the design requirements, a partitioning design scheme for the large cylindrical thin-walled part based on additive manufacturing and welding combination process is obtained.

[0046] In this invention, the requirements for zoning adjustment of large cylindrical thin-walled parts are as follows:

[0047] 1) Adjust the partition interface towards the low-load area based on the actual load conditions of the large cylindrical thin-walled parts;

[0048] 2) The dimensions of each section of the adjusted large cylindrical thin-walled part shall not exceed the space limitations of the additive manufacturing equipment;

[0049] 3) The interfaces of each section of the adjusted large cylindrical thin-walled part should, as far as possible, divide similar structural features (irregular and complex surfaces, irregular reinforcing rib layouts, and high-precision manufacturing areas) into the same area;

[0050] For example, in this embodiment of the present invention, the large cylindrical thin-walled part is made of titanium alloy. According to the verification results, the strength of the partition interface meets the design requirements, so a three-segment partitioning design is adopted. The first and second zones adopt the powder spreading process, and the third zone adopts the powder feeding process.

[0051] Combination Figure 3 and Figure 4 As shown, the method of the present invention divides the large cylindrical thin-walled part into three areas for processing and manufacturing, while the traditional method requires dividing the large cylindrical thin-walled part into 12 areas for processing and manufacturing. The method of the present invention has higher processing efficiency, and the accuracy after splicing is higher and the deformation is smaller than that of the traditional method.

[0052] Finally, the present invention also provides a large cylindrical thin-walled part, which is processed using the above-mentioned large cylindrical thin-walled part partition design method.

[0053] The method for partitioning large cylindrical thin-walled parts provided by this invention is based on additive manufacturing and welding combination process to realize partitioning design and processing of large cylindrical thin-walled parts. Compared with the traditional sheet metal forming combination process, the manufacturing of large cylindrical thin-walled parts using this method has the advantages of high manufacturing efficiency and small part deformation.

[0054] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for partitioning design of large cylindrical thin-walled parts, characterized in that, include: Step S1: Based on the manufacturing space limitations of the additive manufacturing equipment, perform preliminary partitioning of the large cylindrical thin-walled parts according to the minimum number of parts partitions; Step S2: Identify the structural features and manufacturing requirements of each section of the large cylindrical thin-walled part, and select the additive manufacturing process for each section based on the structural features and manufacturing requirements of each section of the large cylindrical thin-walled part. Step S3: Determine the performance reduction value of each zone of the welding interface of the large cylindrical thin-walled part, and perform strength verification of the welding interface based on the actual load of the large cylindrical thin-walled part and the performance reduction value of the welding interface. Step S4: If the strength check of the welded interface does not meet the design requirements, adjust the partitioning of the large cylindrical thin-walled part, and repeat steps S2 to S3 and recheck the strength of the welded interface. If the strength check of the welding interface meets the design requirements, a partitioned design scheme for large cylindrical thin-walled parts based on additive manufacturing and welding combined processes is obtained.

2. The partition design method for large cylindrical thin-walled parts as described in claim 1, characterized in that, The structural features and manufacturing requirements identified include: 1) Identify surface features, i.e., whether there are irregular or complex surfaces within the initial partition of a large cylindrical thin-walled part; 2) Identify the layout of reinforcing ribs, that is, whether there are irregular reinforcing rib layouts within the initial partition of large cylindrical thin-walled parts; 3) Identification accuracy requirements, i.e., whether there are areas requiring high-precision manufacturing within the initial partitioning of large cylindrical thin-walled parts.

3. The partition design method for large cylindrical thin-walled parts as described in claim 2, characterized in that, If a large cylindrical thin-walled part has an irregularly shaped complex surface, an irregularly shaped reinforcing rib layout, or an area requiring high-precision manufacturing, then a powder spreading forming process is used; otherwise, a powder feeding forming process is used.

4. The partition design method for large cylindrical thin-walled parts as described in claim 3, characterized in that, The method for calculating the performance reduction of the welding interface of each zone of the large cylindrical thin-walled part is as follows: In the formula: σ is the working normal stress of the weld; σ b S represents the tensile strength of the base material of the weldment; b K is the failure normal stress of the weld; K1 is the strength weakening coefficient of the weld; τ is the working shear stress of the weld; τ f K is the breaking shear stress of the weld; K2 is the tensile-shear coefficient of the weld.

5. The partition design method for large cylindrical thin-walled parts as described in claim 4, characterized in that, The method for adjusting the partitions of the large cylindrical thin-walled part is as follows: 1) Adjust the partition interface towards the low-load area based on the actual load conditions of the large cylindrical thin-walled parts; 2) The dimensions of each section of the adjusted large cylindrical thin-walled part shall not exceed the space limitations of the additive manufacturing equipment; 3) The interfaces of each section of the adjusted large cylindrical thin-walled part should, as far as possible, divide similar structural features into the same area.

6. A large cylindrical thin-walled part, characterized in that, The large cylindrical thin-walled part is obtained by the partition design method for large cylindrical thin-walled parts as described in any one of claims 1 to 5.

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