Forming method of aluminum alloy storage tank hemispherical shell

Abstract

The invention provides a forming method of an aluminum alloy storage tank hemispherical shell, and belongs to the technical field of manufacturing of storage tanks for spaceflight. According to the forming method of the aluminum alloy storage tank hemispherical shell, by machining the inner surface of a spinning part blank which is subjected to solution treatment to make the spinning part blank matched with a spinning die, it is achieved that the same set of spinning die is utilized to conduct an ausforming technology, so that aluminum alloy shell reaches the T87 state, the cost of the die issaved, and partial quenching stress is also released in the machining process; during subsequent lathing for thinning, by matching with the decreasing rotary speed, the feeding rate and the feed amount in the processes of rough machining, semi-finish machining and finish machining, the quenching stress is controlled to be gradually and uniformly released, the generation trend of the machining stress is reduced, and the residual stress of the large-size hemispherical storage tank shell in different machining stages is further lowered, so that the machined storage tank hemispherical shell meetsthe designing and using requirement. The wall thickness satisfies the condition that the wall thickness is (0.9+0.2)mm larger than the designed size, and the percent of pass of the size is larger thanor equal to 95%.

Description

technical field [0001] The invention belongs to the technical field of aerospace storage tank manufacturing, and in particular relates to a method for forming a hemispherical shell of an aluminum alloy storage tank. Background technique [0002] The large-sized thin-walled 2219 aluminum alloy storage tank hemispherical shell with a diameter of φ1-2m and a wall thickness of only about 1.0mm is widely used in aerospace vehicles. The weight of the storage tank directly affects the payload and on-orbit time of the aircraft. Therefore, extremely high requirements are placed on the dimensional accuracy control and weight control of the storage tank. For the hemispherical shell of the large-sized thin-walled aluminum alloy storage tank, the existing technology generally adopts sheet metal spinning to form a hemispherical blank, and then performs solid solution and aging treatment to improve the mechanical properties, and then is machined and thinned to form a hemispherical tank she...

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