A large aircraft skin blank structure and skin stretching forming method

Abstract

The invention relates to an aviation sheet metal part and a forming method thereof, belonging to the technical field of aviation manufacturing. The utility model relates to a large aircraft skin blank structure. The end of the skin blank has a structure that protrudes outward in the stretching direction. A method for drawing and forming a skin, wherein the skin is the above-mentioned skin blank structure, comprising the following steps: Step 1: Raise the jaws of a drawing machine at a certain angle and bend, and clamp both ends of the skin blank. Hold it in the jaws of the drawing machine; Step 2: Make the jaws of the drawing machine move toward each other in the horizontal direction to warp the skin blank; Step 3: Lower the height of the jaws of the drawing machine, and connect the skin blank The surface of the skin-pulling die is in contact; Step 4: Make the jaws of the stretching machine perform a stretching motion in the direction away from the skin-pulling die in the horizontal direction, and completely stretch the skin-blank and the skin-pulling die surface Fit, you can. The invention has the following advantages: the quality of the skin is improved, thereby realizing a more excellent aerodynamic shape of the aircraft.

Description

technical field [0001] The invention relates to an aviation sheet metal part and a forming method thereof, belonging to the technical field of aviation manufacturing. Background technique [0002] Aircraft skin stretch forming technology is a forming technology for aircraft sheet metal parts. Compared with other sheet metal forming technologies, skin stretch forming technology has the technical advantage of small part springback, and is especially suitable for large multi-dimensional curvature masks. It is widely used in the aerospace industry for the molding of leather parts. However, due to the inconsistency of the radians of the skin in different parts and regions, in order to ensure that the skin material does not break and minimize the generation of slip lines on the outer surface when stretching complex variable-curvature skin parts, there are often After the skin is formed, the curvature of the shape does not meet the requirements of the engineering drawings, which a...

AI Technical Summary

Problems solved by technology

However, due to the inconsistency of the radians of the skin in different parts and regions, in order to ensure that the skin material does not break and minimize the generation of slip lines on the outer surface when stretching complex variable-curvature skin parts, there are often After the skin is formed, the curvature of the shape does not meet the requirements of the engineering drawings, which affects the acceptance of the skin, and the assembly stress caused by the poor conformity of the shape and curvature seriously affects the flight safety of the aircraft

[0003] The traditional skin blank has a simple rectangular or square structure, which is not conducive to obtaining a relatively uniform deformation of each part of the skin during the stretching process, especially when the curvature of the shape of different parts of the skin changes significantly , the inhomogeneity of the plastic deformation of the skin is more significant, which can easily lead to defects such as slip lines and cracks in the local area of ​​the skin due to the large amount of plastic deformation, and the radian of the local area of ​​the skin is unqualified

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