Forming method for large high-modulus ellipsoidal molded surface hemispherical shell of aluminum alloy storage box

Abstract

The invention relates to a forming method of a large high-modulus thin-wall ellipsoidal molded surface hemispherical shell of an aluminum alloy storage box for spaceflight and belongs to the technicalfield of storage box forming. A round plate blank is used for direct precise numerical-control spinning forming of the large high-modulus ellipsoidal molded surface hemispherical shell of the aluminum alloy storage box, and auxiliary working procedures such as pre-forming and intermediate heat-treatment are not needed; through the technical design and precise control, the combined technique of heat conventional spinning and then heat power spinning at the first stage and heat conventional spinning at the second stage is adopted, and the large high-modulus ellipsoidal molded surface hemispherical shell of the aluminum alloy storage box can be precisely formed only by using a spinning block, through clamping at a time and in one numerical-control program, so that the technical process is shortened, the production efficiency is improved, and the forming precision of a member can be greatly improved; and a unilateral gap between the inner molded surface of the formed ellipsoidal molded surface hemispherical shell and a theoretical molded surface template is smaller than 0.2 mm, and the wall thickness difference of the inner molded surface of the formed ellipsoidal molded surface hemispherical shell and the theoretical molded surface template is smaller than 0.2 mm.

Description

technical field [0001] The invention relates to a method for forming a hemispherical shell of a large-scale high-modulus thin-wall aluminum alloy tank with an ellipsoidal surface for aerospace, and belongs to the technical field of tank forming. The "large" in the large-scale high-modulus thin-walled ellipsoidal surface means that the maximum diameter of the ellipsoidal surface is not less than Φ1300mm; high modulus means that the ratio of the major axis to the minor axis of the ellipsoidal surface is not less than 2 , Thin-walled means that the wall thickness of the ellipsoidal surface is not greater than 5mm. Background technique [0002] For large-scale high modulus thin-walled ellipsoidal aluminum alloy storage tank hemispherical shells with inner diameter>Ф1300mm and wall thickness<5mm, it is difficult to directly form raw materials into target components, and the wall thickness accuracy is not easy to control; more reasonable forming The path is to first form th...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, and to provide a method for forming a hemispherical shell of a large-scale high-modulus thin-walled ellipsoidal aluminum alloy storage tank, which can overcome the relatively complex process in the prior art. Many, increased cost and decreased accuracy

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