Forming method of aluminum alloy top cover component with convex hole

Abstract

The invention provides a forming method of an aluminum alloy top cover component with a convex hole. The forming method comprises the step of using a forming device, wherein the forming device comprises a mold main body, an inlay ring and a lifting lug bolt; the mold main body comprises a mold main body forming surface, a top plate, a positioning part A, an annular groove and a supporting structure; the annular groove is concavely arranged downwards from the upper surface of the mold main body forming surface; the positioning part A is arranged on an inner ring or an outer ring of the annular groove and is used for positioning the inlay ring; and the inlay ring comprises an inlay ring forming surface, a concave hole, a positioning part B matched with the positioning part A for positioning, and a first threaded hole. The forming method comprises the following steps of replacing or determining the inlay ring, positioning and placing a plate, applying an external load, carrying out creep aging, unloading the external load and the like. According to the forming method provided by the invention, the problems that a traditional process for the top cover with the convex hole is low in manufacturing precision, multiple in machining procedures and the like are solved, and the forming method has the advantages of being high in forming precision, good in process repeatability, low in residual stress, good in size stability and the like.

Description

technical field [0001] The invention belongs to the field of forming aluminum alloy top cover components, in particular to a forming method of an aluminum alloy top cover component with convex holes. Background technique [0002] Creep age forming technology is a technology that emerges at the historic moment to solve the high-performance and high-precision manufacturing problems of large and complex aerospace components. This technology makes use of the creep and aging strengthening characteristics of materials under the action of stress field and temperature field, and makes the workpiece fit the mold surface through vacuum loading without punch or mechanical loading with punch, and under a constant temperature state Maintain a certain period of time to make the material flow plastically, so as to realize the collaborative manufacturing of component forming and forming. [0003] Creep aging forming technology can not only realize the integrated forming of large components...

AI Technical Summary

Problems solved by technology

[0005] The large top cover with convex holes, which has a large hole in the middle and small flanging holes on the periphery, is the main structural component of the aerospace launch vehicle fuel tank. The traditional forming method of this component is stamping, which not only has low forming accuracy , long processing cycle, etc., and because the flanging process of the convex hole is located after the stamping process of the main body of the component, the flanging of the convex hole further affects the overall shape accuracy of the top cover component, and after the component is formed, it will be due to large internal Residual stress affects the final dimensional accuracy

[0006] The creep aging forming process can be divided into three stages: loading stage, creep aging stage, and unloading stage. In the process of the component gradually deforming under the external load of the loading stage and fitting the mold surface, the convex hole of the component The position state has also changed, and it is difficult to ensure the position accuracy of the convex hole after the component is formed. This problem has always been a problem that plagues the integrated forming of components with convex holes.

[0007] The mold is the tooling required for creep aging forming. In the existing creep aging mold equipment technology, a set of molds can only form components of a certain shape and size, and cannot realize the production of components of various specifications.

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