A Web Warpage Control Method for Large Frame Sheet Metal Parts

Abstract

The invention provides a method for controlling warping of a web of a large frame type sheet metal part, and belongs to the technical field of aircraft manufacturing. For a large frame type sheet metal part of which the variable curvature, the variable section and the length are more than 1m, the method is that a technological rib groove structure is added to the outer flank of bent edge of the outer side of frame type rib part, so as to enable uniform distribution of the stress on the bent edge of the outer side of such parts after forming. The method is applicable to further control of the warping of the web of the large frame type part of which the bent edge section is complex and the curvature and the sectional linear dimension are changed constantly according to the bent edge line after forming and unloading, on the basis of springback compensation. With the adoption of the method, the springback of the part can be controlled, and the warping of the web of the part can be effectively controlled; after being formed, the part can simply meet the requirement on accurate formation without or with little manual repair by tapping, so that the forming quality and the production efficiency of the large frame type part can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of aircraft manufacturing, and in particular relates to a web warping control method of a large frame-like sheet metal part. Background technique [0002] Large-scale frame sheet metal parts are important components in the skeleton of a large aircraft body. They are more than 1 meter long, have different bending edges, and have complex cross-sectional shapes, and the cross-sectional size changes continuously along the bending line. The machining accuracy directly affects the accuracy of the shape of the aircraft. degree and structural bearing capacity. At present, large-scale frame sheet metal parts generally adopt the rubber bag forming process, and among the factors affecting the forming accuracy of large frame-type sheet metal parts, web warping is an important factor. [0003] Modern aircraft production puts forward higher requirements for the precision and quality of sheet metal parts manufacturing, an...

AI Technical Summary

Problems solved by technology

Forming such parts using traditional forming methods requires a lot of manual knocking and repairing, resulting in reduced forming accuracy and fatigue life of the parts, long manufacturing cycle and high cost.

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