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Method for manufacturing multi-layer hollow structure through closed section pipe blank

A hollow structure and closed section technology, which is applied in the field of manufacturing multi-layer hollow structures with closed section tube blanks, can solve the problems of uneven deformation of skin or interlayer, uneven distribution of wall thickness, large local deformation, etc. The effect of mass production, good wall thickness uniformity and high forming accuracy

Active Publication Date: 2017-08-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the superplastic forming / diffusion bonding method still has many deficiencies in practical applications: 1) The material performance is high, and it needs to have superplasticity; 2) The treatment and assembly of the surface to be connected by diffusion bonding are high; 3) Thermal cycle For a long time, some side effects will occur in some cases, such as excessive growth of grains; 4) The degree of deformation of the skin or interlayer is uneven, and the local deformation is large, resulting in uneven distribution of wall thickness; 5) The degree of deformation of the skin The forming is affected by the interlayer, and it is easy to form defects such as wrinkles and depressions; 6) The design of the interlayer structure needs to consider the large plastic deformation required when the interlayer changes from a two-dimensional flat structure to a three-dimensional space structure, which is relatively complicated; 7) The distance between the upper and lower skins Larger hollow structures need to adopt 4 layers (or more) structure, the process is difficult and the forming quality is difficult to guarantee
Since the forming and joining conditions vary between dissimilar materials, it is difficult to realize the forming of multilayer structures of dissimilar materials by this method

Method used

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  • Method for manufacturing multi-layer hollow structure through closed section pipe blank
  • Method for manufacturing multi-layer hollow structure through closed section pipe blank
  • Method for manufacturing multi-layer hollow structure through closed section pipe blank

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specific Embodiment approach 1

[0047] Specific implementation mode one: combine Figure 1a to Figure 1f and Figure 2a to Figure 2f Explain that the method for manufacturing a multi-layer hollow structure by using a pipe or a plate as a skin and using a pipe as a closed-section tube blank as a core tube is realized through the following steps:

[0048] Step 1. Structural design. According to the load-bearing conditions and technical requirements of the final structure, a reasonable multi-layer hollow structure and its decomposition structure are designed based on the closed-section tube blank;

[0049] Step 2, process design, according to the designed multi-layer hollow structure and its decomposition structure, determine the outer skin and inner sandwich core tube prefabricated blank and the corresponding forming process, as well as the outer skin and core tube assembly and connection process, The skin blank 1 adopts a slab or a larger-diameter round-section tube blank, and the core tube blank 2 adopts a ...

specific Embodiment approach 2

[0056] Specific implementation mode two: combination Figure 1a to Figure 1f and Figure 2a to Figure 2f Note, the difference between this embodiment and the specific embodiment one is: for the multi-layer hollow structure with complex shape and internal structure, only use Figure 1b or Figure 2b After simple assembly of the preforms shown, the matching accuracy between the skin preform 1 and the core tube preform 2 cannot meet the conditions required for the subsequent connection. Figure 1c or Figure 2c The assembly structure 5 shown is subjected to secondary shaping, that is, the assembly structure 5 obtained in step 4 is put into the overall preforming mold, and the assembly structure 5 is formed under the joint action of the external rigid mold and internal pressure (liquid or gas). Deformation, the skin preform 3 in the assembly structure 5 and the core tube preform 4 in the assembly structure 5 are further deformed, and the outer skin closely fits the mold cavity ...

specific Embodiment approach 3

[0057] Specific implementation mode three: combination Figure 1a to Figure 1f and Figure 2a to Figure 2f Note that the difference between this embodiment and the second embodiment is that it is difficult to obtain high-precision skin preforms at room temperature for materials with high strength, poor plastic deformation ability, and large rebound at room temperature, such as TC4 titanium alloy. Core tube preform or secondary shaping part 6. At this time, the material can be heated to a suitable temperature, such as TC4 titanium alloy heated to 600-900°C, and then the preform preparation and secondary shaping steps can be performed. Other steps are the same as in the second embodiment.

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Abstract

The invention discloses a method for manufacturing a multi-layer hollow structure through a closed section pipe blank and relates to a method for manufacturing the multi-layer hollow structure to solve the problems existing in an existing method for manufacturing the multi-layer hollow structure, improve the light weight degree of the multi-layer hollow structure and expand the application range of the multi-layer hollow structure. The method includes the main steps that firstly, structural design is conducted; secondly, technology design is conducted; thirdly, prefabricated blanks are prepared, wherein a skin blank and a core pipe blank are formed to the needed skin prefabricated blank and the needed core pipe prefabricated blank; fourthly, assembling is conducted, wherein the formed skin prefabricated blank and the formed core pipe prefabricated blank are assembled into a corresponding assembling structure according to design of the multi-layer hollow structure and a decomposing structure; and fifthly, connecting is conducted, wherein the obtained skin prefabricated blank and the obtained core pipe prefabricated blank in the assembling structure are mutually connected to form an integral connecting piece through a connecting method. The method is used for manufacturing of the multi-layer hollow structure.

Description

technical field [0001] The invention relates to a method for manufacturing a multi-layer hollow structure, in particular to a method for manufacturing a multi-layer hollow structure by using a closed-section tube blank. Background technique [0002] The multi-layer hollow structure has outstanding advantages such as light weight and high rigidity, and has been widely used in the fields of aerospace and national defense. However, due to the complex cross-sectional shape and internal structure of the multi-layer hollow structure, high requirements are placed on the forming equipment, process conditions and raw materials, and the production efficiency is low and the cost is high, which largely limits the multi-layer hollow structure. wide application. [0003] The multi-layer hollow structure is generally divided into two parts, the outer skin and the inner interlayer, and the outer skin and the inner interlayer are connected into a whole by a suitable method. The outer skin ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 何祝斌苑世剑凡晓波
Owner HARBIN INST OF TECH
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