A forming method to ensure high airtightness of aluminum alloy launching box

Abstract

The invention discloses a forming method for ensuring the high airtightness of an aluminum alloy launch box. The aluminum alloy launch box includes a box body with open left and right ends, flanges respectively connected to the two ends of the box body, and flanges connected to the flanges respectively. The box cover, the box body includes a skeleton and a multi-segment skin, each skin includes two U-shaped plates, the skeleton includes a plurality of ring frames and a plurality of beams, and each ring frame is made of multi-section angle aluminum and a plurality of square tubes. The forming method comprises the following steps: 1) welding forming, including the following sub-steps: 1.1) continuous welding of two U-shaped plates of each section of skin; 1.2) welding skeleton; 1.3) welding skeleton and skin; 1.4 ) welding flange and skin; 1.5) welding embedded parts; 2) post-welding treatment: stress relief annealing for the box; 3) box cover assembly. The invention strictly controls the welding process and assembly precision, no leakage occurs in the welding seam and assembly parts, can effectively improve the quality of aluminum alloy welding and assembly, and ensure the airtight performance of the box body.

Description

technical field [0001] The invention belongs to the field of launch boxes, and more specifically relates to a forming method of a launch box. Background technique [0002] An aluminum alloy launch box has a large size, with a skin inside, a skeleton on the outside, flanges on both ends, embedded parts on the inside, and airtight covers on both ends. The skin, skeleton, flange, and pre-embedding are welded and formed by manual tungsten argon arc welding, and the airtight cover is assembled and formed. After the box is formed, it is required to have high airtight performance. Use a helium mass spectrometer leak detector to check the leakage of all airtight welds (the detection accuracy of the helium mass spectrometer leak detector is 1.0×10 -9 , after the leak detector shows that the value is stable and the order of magnitude remains unchanged, it is necessary to find the leak point if the preceding decimal changes by more than 0.2, such as 1.0×10 -9 Change to 1.2×10 -9 nee...

AI Technical Summary

Problems solved by technology

In the early stage, there was no aluminum alloy launch box with such high airtight requirements, which put forward high requirements for the control of the box welding and assembly process

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