A Prestressed Shot Peening Forming Method for Integral Ribbed Panels with Broken Ribs

Abstract

The invention discloses a prestressed shot-peening forming method for the rib-broken area of ​​an integral wall plate with ribs. Before the wall plate is processed, corresponding auxiliary pre-stressed shot-peening tooling is manufactured according to the cross-sectional size of the ribs, and is effectively connected with the guide rail of a machine tool. When the prestressed clamping of the overall wall panel starts, the forming tool is installed in the corresponding rib breaking area, adjusted to a suitable position according to the height of the rib, and at the same time, the forming tool is fastened to the machine tool guide rail. The feed bolt realizes the auxiliary prestressed clamping of the broken rib area, ensuring that the broken rib area of ​​the overall wall panel is effectively controlled during the prestressed clamping process, and the shape does not change suddenly, and finally ensures the smooth state of the prestressed clamping of the overall wall panel .

Description

technical field [0001] The present application relates to the technical field of aircraft manufacturing, and further relates to the shot peening manufacturing of aircraft wall panels, specifically a method for prestressed shot peening forming in broken rib areas of integral ribbed wall panels. Background technique [0002] Shot peening technology is currently a relatively mature plastic forming method for metal wing panels. In order to obtain a larger curvature shape, prestress is usually applied during the shot peening process, so that the panel undergoes elastic deformation before shot peening. Pre-deformation, and then plastic deformation occurs under the impact of high-speed running projectiles, and finally obtains the theoretically required shape. If shot peening is performed without applying prestress, it is difficult to obtain a large curvature shape. Therefore, for metal panels with strong rigidity such as integral ribs, only shot peening under prestress can obtain t...

AI Technical Summary

Problems solved by technology

The saddle-shaped integral ribbed panel is a typical example of this type of panel. However, in the actual scientific research and production, there are still some problems in the prestressed forming of the saddle-shaped integral ribbed panel: "the ribs of the integral panel The lengths of the strips are not completely equal, the broken ribs of the ribs are not completely on the same vertical plane, the rigidity of the broken ribs of the wall panel is quite different from that of other ribs, and the prestressed clamping process cannot be completely carried out according to the head of the broken ribs. Therefore, in the process of prestressing and clamping, some broken tendon areas of the panel must be in the "no prestressed clamping area", resulting in the deformation of the area of ​​the broken tendon and the belt in the prestressed clamping process The deformation of the rib area is inconsistent, the overall prestressed clamping of the wall panel is not smooth, and the shape of the broken rib area is prone to sudden changes

[0003] When pre-bending and clamping the saddle-shaped integral wall panel with ribs, the force-bearing column is generally set on the inner surface of the wall panel, and the force-applying column is set on the outer surface of the wall panel, and the prestressing force is applied to the wall panel from the outer surface. It bulges toward the inner surface in the length direction. At this time, the shape of the broken tendon head area in the "non-prestressed clamping area" will change suddenly, resulting in a large stress concentration, and even ribs will appear during the prestressed clamping process. Strips and skin tearing, which seriously affects the shot peening effect of wall panels

For this situation, there is currently no effective method that can not only satisfy the optimal prestressed clamping method of the wall panel, but also ensure the ideal prestressed state of the broken tendon head area

Moreover, there is a lack of targeted research on the prestressed shot peening of the broken rib area of ​​the overall ribbed wall panel at home and abroad. At present, it is impossible to better solve the above problems by adjusting the shot peening process method and process parameters.

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