Manufacturing method for large-scale thin-wall skin with inner ribs and complex mold cavities

Abstract

The invention provides a manufacturing method for a large-scale thin-wall skin with inner ribs and complex mold cavities. The manufacturing method comprises the steps that 1, simulation flattening is conducted on the skin according to a skin parameter, a parameter of the flattened skin is collected, a rough machining programming and a finish machining programming are conducted, and a minimum workblank is calculated; 2, the minimum workblank is selected to be machined roughly in order to release residual stress inside the workblank in advance; 3, a roughly machined skin plate is adsorbed and fixed through a vacuum tire, finish machining is conducted on the skin plate, and the rib strips and the weight reducing cavities inside the skin are machined out through numerical control milling machining; 4, a plurality of base plates which can fill and level up each weight reducing cavity are prepared, it is ensured that the skin machined through the step 3 again becomes a slab with the flat surface after each base plate is cushioned, and then the skin is machined to be formed through a matched mould thermal forming method, and 5, annealing and stress-relieving are conducted. According to the manufacturing method for the large-scale thin-wall skin with the inner ribs and the complex mold cavities, the deformation of the thin-wall skin in the machining process is effectively controlled, and the molded surface precision of the skin is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing and relates to a method for manufacturing a large thin-walled aluminum alloy skin with internal ribs and complex cavities, which is suitable for the precise manufacture of large thin-walled skin parts for aerospace. Background technique [0002] At present, more and more large thin-walled skin parts are used in the aerospace field. In order to reduce the weight and improve the mechanical properties of aviation weapons in the modern aerospace field, more and more large thin-walled skinned Leather parts. However, although large thin-walled skins have many advantages in aviation weapons, the processing deformation of large-scale thin-walled skins has been plaguing the aerospace industry for many years. At present, the research on the processing technology of large thin-walled skins is not deep enough. The measures are not yet perfect. [0003] At present, in the manufacturing process ...

AI Technical Summary

Problems solved by technology

However, although large-scale thin-walled skins have many advantages in aviation weapons, the processing deformation of large-scale thin-walled skins has been plaguing the aerospace industry for many years. Measures are not perfect

[0003] At present, in the manufacturing process of this kind of parts, part of the panel is bent into a skin structure first, and then the ribs and weight-reducing cavity are processed by a multi-axis machining center. The CNC machining is difficult and complicated; The cavity is processed down, and then the skin is formed by mechanical means such as a bending machine, resulting in large deformation of the skin, and the precision of the formed skin surface is low, and the pass rate is low, which seriously affects the progress of the model product.

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