Step-by-step progressive hot forming and hot correcting integrated method for thin-wall integral wall plate with ultrahigh reinforcing ribs and oversized flanges

Abstract

The invention provides a step-by-step progressive hot forming and hot correcting integrated method for a thin-wall integral wall plate with ultrahigh reinforcing ribs and oversized flanges. An original blank of the integral wall plate in a flat state is clamped on a three-axis numerical control machine tool through a vacuum flexible clamping technology, and numerical control milling machining is conducted on the ultrahigh reinforcing ribs, the oversized flanges and grids of the thin-wall integral wall plate. Then, vibration is adopted for stress relieving, the influence of material internal stress on machining deformation is eliminated. Through the equal-rigidity reinforcing technology and the step-by-step progressive hot forming and hot correcting integrated technology, the following problems are solved that when the aluminum alloy thin-wall integral wall plate with the ultrahigh reinforcing ribs and the oversized flanges is formed, the forming resistances of the reinforcing ribs andthe flanges of the wall plate are greatly different, serious uneven deformation is likely to happen, a transition area around the flange is likely to break in the deformation process, and the formingdifficulty is very large. The method achieves low-stress manufacturing of the thin-wall integral wall plate structure with the ultrahigh reinforcing ribs and the oversized flanges.

Description

Technical field [0001] The invention relates to an integrated method of stepwise progressive thermoforming and thermoforming of a thin-walled integral wall panel with super-high reinforcement ribs and super-large flanges, and belongs to the technical field of large-scale spacecraft manufacturing. Background technique [0002] The existing thin-walled integral wall panels have relatively large flanges, higher flange heights, and higher reinforcement ribs. The height difference between flanges and reinforcement ribs is relatively large. The skin has a sudden change in position and thickness difference, and at the same time, a large stiffness difference is formed. During the forming process of this type of siding, the forming resistance of different positions is quite different. The oversized flange, stiffeners, and siding skin are deformed during the deformation process. The force is extremely unbalanced, and serious uneven deformation is prone to occur. The relatively high stiffen...

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Problems solved by technology

However, this method uses polyurethane rubber to fill the grid of the overall wall panel, and then adopts the process method of forming at room temperature, which can only solve the problem of ordinary integral panel forming with flanges, but cannot solve the problem of thin-walled integral panels with super high ribs and super large flanges. In the process of panel forming, the ribs are unstable and the joints between the skin and the ribs, and the joints between the flange and the ribs are prone to breakage

This method adopts room temperature forming. During the room temperature forming process of the aluminum alloy integral panel, the elongation of the aluminum alloy is very low, the plasticity is very poor, the formability is poor, and the work hardening is serious. During the forming process, the super high rib deformation process Among them, due to poor plasticity, it is difficult to deform and cause instability such as distortion or fracture. In addition, polyurethane rubber sheets are used for equal stiffness treatment, and the forming resistance of different positions still varies, and the deformation of flanges, skins, and ribs is difficult to maintain. The uneven deformation is serious, and the joints between the skin and the ribs, and the joints between the flange and the ribs are prone to breakage, resulting in a very low pass rate of the overall panel forming, and the work hardening at room temperature is serious, and the formed panel remains very stressful

[0004] Therefore, in order to solve the problem that the existing method cannot manufacture thin-walled integral panels with super-high ribs and super-large flanges and the low forming pass rate, it is necessary to develop a new forming method for forming

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