Forming method for ensuring high gas tightness of aluminum alloy launch box

Abstract

The invention discloses a forming method for ensuring high gas tightness of an aluminum alloy launch box. The aluminum alloy launch box comprises a box body with left and right ends open, flanges respectively connected with two ends of the box body and box covers respectively connected with the flanges, the box body comprises a frame and a plurality of sections of skin, each section of the skin comprises two U-shaped plates, the frame comprises a plurality of ring frames and a plurality of beams, and each ring frame is connected by a plurality of sections of angle aluminum and a plurality of square pipes. The forming method comprises the following steps of (1), welding forming, specifically, (1.1), continuous welding is performed on the two U-shaped plates of each section of the skin, (1.2), the frame is welded, (1.3), the frame and the skin are welded, (1.4), the flanges and the skin are welded, and (1.5), embedded parts are welded; (2), post-weld treatment, specifically, stress relief annealing is performed on the box body; and (3), assembling the box covers. According to the forming method, the welding process and assembly accuracy are strictly controlled, no leakage occurs in welding seams and assembly parts, the welding and assembly quality of aluminum alloy can be effectively improved, and the gas tightness performance of the box body is ensured.

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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