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Rapid manufacturing method used for outer storing box gridding wallboard of aerospace craft

A technology for aerospace vehicles and manufacturing methods, which is applied in the field of aerospace aluminum alloy structure manufacturing, and can solve problems such as grid panels for external storage tanks of aerospace vehicles that have not yet been seen, achieve excellent shear resistance, uniform composition, and reduce manufacturing costs Effect

Inactive Publication Date: 2014-03-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] At present, friction stir welding has been widely used in the manufacture of aluminum alloy structures, but it has not been seen that the friction stir processing method has been applied to the manufacture of grid panels for outer storage tanks of aerospace vehicles.

Method used

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  • Rapid manufacturing method used for outer storing box gridding wallboard of aerospace craft
  • Rapid manufacturing method used for outer storing box gridding wallboard of aerospace craft
  • Rapid manufacturing method used for outer storing box gridding wallboard of aerospace craft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Example 1: Processing method of pre-welded grid structure with rib shape:

[0065] Processing on the 8mm×690mm×690mm base plate such as Picture 1-1 The distribution grid shown is welded with a rib width of 30mm and a grid depth of 8mm. First, the 4mm thick aluminum alloy plate is cut to obtain (1) 8 aluminum plates of 150mm×30mm in size, and (2) 3 aluminum plates of 690mm×30mm in size. Arrange the aluminum plates 1 symmetrically on both sides of the aluminum plate 2, and the distribution is as follows Picture 1-1 Shown. Use a stirring head with a shaft shoulder diameter of 12mm and a stirring needle length of 3.5mm to complete such Figure 1-2 There are six sets of corner joints shown in. Get after welding figure 2 The structure of rib 1 is shown in. Repeat the above steps to complete the welding of the second set of ribs 1.

[0066] First, a set of ribs 1 is arranged on the bottom plate 2, and assembled and clamped by friction stir welding lap clamps. The overlapping p...

Embodiment 2

[0068] Example 2: Processing method of grid structure formed by welding ribs on a whole aluminum plate:

[0069] The required meshed siding such as Figure 3-1 with Figure 3-2 As shown, the method in this embodiment does not need to separately process the rib structure in advance. Instead, two aluminum plates 3 and 4 with the same length and width as the bottom plate are placed on the bottom plate. It is assembled and fixed by friction stir welding lap clamp. According to the grid layout, such as Figure 3-1 As shown, the main purpose of marking the surface of the aluminum plate 3 is to mark the position of the ribs in the grid. After finishing the preparatory work, select the welding parameters: rotation speed 900rpm, welding speed 80mm / min, shaft shoulder diameter 30mm, stirring needle length 9.5mm. According to the marking area to complete the friction stir welding of the structure, the overlap of multiple lap welds should also be considered. It can be set as two welds, and...

Embodiment 3

[0071] Example 3: Processing method of grid structure with different reinforcing rib material and base plate material

[0072] The processing dimensions are as given in Example 3. The material of the bottom plate 5 is 2024 aluminum alloy. This aluminum alloy has good plasticity and is suitable for outer storage tank wall panels with good ductility. 7075 aluminum alloy is selected for the material of the lap board 3 and 4, which has high strength. As a reinforcing rib, the wall board can have high strength on the basis of high plasticity to resist external impact and friction. . In this embodiment, the friction stir welding dissimilar aluminum alloy lap joint technology is applied to the grid structure processing of the outer tank wall, and the welding parameters and processing steps are the same as in the second embodiment.

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Abstract

The invention discloses a rapid manufacturing method used for an outer storing box gridding wallboard of an aerospace craft, the outer storing box gridding wallboard comprises a bottom board and gridding ribs and is machined by the adoption of friction stir welding equipment. The rapid manufacturing method includes the following steps that (1), a bottom board plate is machined in advance; (2), material of stitch welding plates is selected following the principle of component matching between the stitch welding plates and the bottom board or the principle of performance complementation; the size of the stitch welding plates is determined according to the gridding number, the gridding size and the rib width on the bottom plate; (3), a friction stir stitch welding clamp used for the structure is designed; (4), the manufacturing concept of layering material increase-partial milling is achieved through the friction stir stitch welding gridding ribs; (5), finish machining is performed. The manufacturing concept of layering material increase is combined with the friction stir welding technology, and not only can gridding rib wallboards in various shapes and heights be manufactured, but also a heterogeneous aluminum alloy ribbed bar gridding wallboard can be manufactured and machined on a thin aluminum sheet, which can not be achieved through existing chemical milling and mechanical milling methods.

Description

Technical field [0001] The invention belongs to the field of aerospace aluminum alloy structure manufacturing. Specifically, it refers to a grid-like stiffened wall panel member of the outer tank structure of a spacecraft, that is, a kind of additive-partial milling rapid manufacturing of the grid panel method. Background technique [0002] The outer tank structure is an important part of a large-scale launch vehicle, and its main part is a cylindrical barrel container formed by crimping and welding of aluminum alloy wall panels. Since the outer storage tank not only carries the booster, but is also the support and connection mechanism of the orbiter, the tank wall must have high strength to face the harsh working environment under the premise of satisfying the load tightness. Increasing the thickness of the siding can increase the strength, but it also directly affects the weight of the launch vehicle. In order to ensure the working strength of the outer storage tank and reduc...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23K20/12
CPCB23K20/129B23K20/14B23K2101/006
Inventor 胥妍杨新岐
Owner TIANJIN UNIV
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